CN211318086U - On-site detection device and system for realizing maintenance-free gas density relay - Google Patents

Abstract

The application provides a realize gas density relay non-maintaining field detection device, control the unit including pressure adjustment mechanism and intelligence, control the pressure lift of unit control pressure adjustment mechanism through the intelligence, accomplish the witnessed inspections to gas density relay, need not maintainer to field operation, realized the non-maintaining to gas density relay, improved the reliable safe operation of efficiency and electric wire netting greatly. The application also provides an on-site detection system comprising the on-site detection device.

Description

On-site detection device and system for realizing maintenance-free gas density relay

Technical Field

The utility model relates to an electric power tech field especially relates to an use in, high-voltage electrical equipment, realizes gas density relay non-maintaining's on-the-spot detection device and system.

Background

The gas density relay is used for monitoring and controlling the density of insulating gas in high-voltage and medium-voltage electrical equipment, a contact signal control loop is arranged in the gas density relay, a gas path of the gas density relay is communicated with a gas chamber of the high-voltage and medium-voltage electrical equipment, when gas leakage is detected, a contact of the gas density relay acts to generate a contact signal, and the contact signal control loop gives an alarm or locks according to the contact signal, so that the safe operation protection of the electrical equipment is realized.

At present, SF6 (sulfur hexafluoride) electrical equipment is widely applied to electric power departments and industrial and mining enterprises, and rapid development of the electric power industry is promoted. In recent years, with the rapid development of economy, the capacity of a power system in China is rapidly expanded, and the usage amount of SF6 electrical equipment is more and more. The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) the reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF₂The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture may form condensed water, so that the surface insulation strength of the insulation part is remarkably reduced, and even flashover occurs, thereby causing serious harm. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.

With the development of the unattended transformer substation towards networking and digitization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring of the gas density and micro-water content state of the SF6 electrical equipment has important practical significance. With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. Currently, on-line monitoring of gas density values in SF6 high-voltage electrical equipment is very common, and existing gas density monitoring systems (devices) are basically: 1) The remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. 2) The gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. The SF6 gas density relay is the core and key component. However, because the environment for the field operation of the high-voltage transformer substation is severe, particularly the electromagnetic interference is very strong, in the currently used gas density monitoring system (device), the remote transmission type SF6 gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and when the pressure reaches the state of alarming, locking or overpressure, information is transmitted to a target equipment terminal in time through a contact connecting circuit, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be transmitted to target equipment (such as a computer terminal) in time to realize online monitoring.

The gas density relay on the SF6 electrical equipment is regularly checked, which is a necessary measure for preventing the gas density relay from being in the bud and ensuring the safe and reliable operation of the SF6 electrical equipment; the 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the SF6 gas density relay is very important and popular in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises are implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density relay, so that the gas density relay for realizing the online gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and further regular checking work of the (mechanical) gas density relay is completed, no maintainer is required to arrive at the site, the efficiency is greatly improved, and the cost is reduced. Meanwhile, the micro-water value in the gas chamber of the electrical equipment can be accurately measured in the online self-checking gas density relay or a monitoring system consisting of the gas density relay.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an use realization gas density relay non-maintaining on-the-spot detection device and system in, on the high-voltage electrical equipment for when solving the gas density to the electrical equipment of gas insulation or arc extinguishing and monitoring, still accomplish the online check-up to gas density relay, raise the efficiency, reduce the operation maintenance cost, guarantee electric wire netting safe operation.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the application provides a field detection device for realizing maintenance-free gas density relay in a first aspect.

In a second aspect, the present application provides a maintenance-free field test system for a gas density relay, the system is composed of the maintenance-free field test device for a gas density relay in the first aspect, or comprises the maintenance-free field test device for a gas density relay in the first aspect.

The application realize gas density relay non-maintaining field detection device, include: the pressure regulating mechanism and the intelligent control unit;

the pressure adjusting mechanism is a closed air chamber, an air vent communicated with an air path of the gas density relay is arranged on the air chamber, a heating element and/or a refrigerating element are arranged outside or inside the air chamber, and the heating element and/or the refrigerating element exchange heat with the gas in the air chamber; alternatively, the first and second electrodes may be,

the pressure adjusting mechanism is a closed air chamber, an air vent communicated with an air path of the gas density relay is arranged on the air chamber, a pressure changing piece is arranged in the air chamber, the pressure changing piece is connected with one end of the reciprocating mechanism, and the other end of the reciprocating mechanism extends out of the air chamber and is connected with a driving part;

the intelligent control unit is connected with the pressure adjusting mechanism and used for receiving and/or calculating the gas density value when the contact of the gas density relay acts.

Preferably, the contact signal is generated when the contact is actuated, and preferably the contact signal comprises an alarm, and/or a latch.

Preferably, the pressure-changing member is a piston, or a bladder, or a bellows.

Preferably, the driving means includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepper motor), a carnot cycle mechanism, a pneumatic element.

Preferably, the on-site detection device further comprises a shell, and the intelligent control unit and the pressure adjusting mechanism are arranged in the shell.

Preferably, the pressure adjusting mechanism is manually adjusted or automatically adjusted. Preferably, the intelligent control unit is configured to realize pressure control of the pressure regulating mechanism.

Preferably, the intelligent control unit controls heating of the heating element and/or cooling of the cooling element.

Preferably, the heating element, and/or the cooling element is a semiconductor.

Preferably, the pressure regulating mechanism further comprises a heat preservation member, and the heat preservation member is arranged outside the air chamber.

Preferably, the pressure changing part of the pressure adjusting mechanism is a piston, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod extends out of the air chamber and is connected with a driving part, the other end of the piston is in sealing contact with the inner wall of the air chamber, and the driving part drives the adjusting rod to further drive the piston to move in the air chamber.

More preferably, the intelligent control unit controls the driving component to drive the adjusting rod so as to drive the piston to move in the air chamber.

Preferably, the pressure changing member of the pressure adjusting mechanism is a piston, the piston is in sealing contact with the inner wall of the air chamber, and a driving member is arranged outside the air chamber and pushes the piston to move in the air chamber through electromagnetic force.

More preferably, the intelligent control unit controls the driving component to push the piston to move in the air chamber through electromagnetic force.

Preferably, the pressure changing part of the pressure adjusting mechanism is an air bag, the reciprocating mechanism is a connecting part for air to enter and exit the air bag, and the driving part drives the air bag to perform air suction or inflation operation.

More preferably, the intelligent control unit controls the driving part to drive the air bag to perform air suction or inflation operation.

Preferably, the pressure changing part of the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the vent, and the other end of the corrugated pipe stretches under the driving of the driving part.

More preferably, the intelligent control unit controls the driving part to drive the bellows to extend and contract.

Preferably, the pressure regulating mechanism is a release valve, and the release valve is arranged in a closed air chamber or is connected with the closed air chamber.

More preferably, the intelligent control unit controls the work of the air release valve.

More preferably, the pressure regulating mechanism further comprises a flow valve controlling the gas release flow rate. Preferably, the intelligent control unit controls the work of the flow valve.

More preferably, the air release valve is an electromagnetic valve or an electric valve, or other air release valves realized by electric or pneumatic means.

Preferably, the pressure regulating mechanism is a compressor. Preferably, the intelligent control unit controls the operation of the compressor.

Preferably, the pressure regulating mechanism is a pump. Preferably, the intelligent control unit controls the work of the pump.

More preferably, the pump includes, but is not limited to, a pressurizing pump, an electric air pump, or an electromagnetic air pump.

Preferably, the pressure regulating mechanism is sealed within a chamber or housing.

Preferably, the intelligent control unit automatically controls the whole verification process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic and input and output.

More preferably, the intelligent control unit automatically controls the whole verification process based on embedded algorithms and control programs such as a general-purpose computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC, an industrial control motherboard, an embedded main control board and the like, and includes all peripherals, logics and input/output.

Preferably, the circuit of the intelligent control unit comprises an intelligent control unit protection circuit, and the intelligent control unit protection circuit comprises one or more of an anti-static interference circuit (such as ESD and EMI), an anti-surge circuit, an electric fast protection circuit, an anti-radio frequency field interference circuit, an anti-pulse group interference circuit, a power supply short circuit protection circuit, a power supply connection reverse protection circuit, an electric contact misconnection protection circuit, and a charging protection circuit.

Preferably, the intelligent control unit further comprises a communication module for transmitting the test data and/or the verification result in a long distance.

More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.

Further, the wired communication mode comprises one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a PLC power carrier and a cable.

Further, the wireless communication mode comprises one or more of a 5G/NB-IOT communication module (such as 5G, NB-IOT), a 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar which are arranged in the sensor.

Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or analog quantity and digital quantity information input.

More preferably, the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged by the misconnection of a user and/or preventing electromagnetic interference.

Preferably, a clock is further arranged on the intelligent control unit and used for regularly setting the checking time, or recording the testing time, or recording the event time.

Preferably, after the on-site detection device completes detection, the intelligent control unit automatically generates a verification report of the gas density relay, automatically sends an alarm if the on-site detection device is abnormal, and/or uploads the verification report to a remote end, and/or sends the verification report to a designated receiver (for example, a mobile phone).

Preferably, the intelligent control unit comprises: microprocessor, man-machine interface, valve controller, pressure regulating mechanism position detector, execution controller (component).

Preferably, the on-site detection device further comprises a valve, one end of the valve is provided with an interface communicated with the electrical equipment, and the other end of the valve is provided with an interface communicated with a gas path of the gas density relay and/or an interface communicated with a gas path of the pressure adjusting mechanism; the valve is also connected with the intelligent control unit and is closed or opened under the control of the intelligent control unit.

More preferably, the valve is an electric valve, and/or a solenoid valve.

Further, the valve is a permanent magnet type electromagnetic valve.

More preferably, the valve is a piezoelectric valve, or a temperature control valve, or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.

More preferably, the valve is closed or opened in a hose bending or flattening mode.

More preferably, the valve is sealed within a chamber or housing.

More preferably, the valve and the pressure regulating mechanism are sealed within a single chamber or housing.

More preferably, the valve is closed, the pressure regulating mechanism is used for increasing the pressure and increasing the load, or the pressure regulating mechanism is used for reducing the pressure and decreasing the load, and the change speed of the load is not more than 10 per mill of the measuring range of the detected gas density relay per second (or is otherwise specified according to specific requirements).

More preferably, pressure sensors are respectively arranged on two sides of the air path of the valve; or, the two sides of the air passage of the valve are respectively provided with a pressure or density detector.

Preferably, the on-site detection device further comprises an on-line check contact signal sampling unit, wherein the on-line check contact signal sampling unit is provided with a sampling contact connected with the gas density relay and configured to sample a contact signal of the gas density relay; the online checking contact signal sampling unit is also connected with the intelligent control unit.

More preferably, the online checking contact signal sampling unit is provided with at least two independent sampling contacts, at least two contacts of the gas density relay can be checked automatically at the same time, and continuous measurement is carried out without replacing or reselecting the contacts; wherein the content of the first and second substances,

the contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.

More preferably, the online verification contact signal sampling unit is used for testing the contact action value of the detected gas density relay or the switching value (the gas density value when the contact is switched to the open-close state) of the contact action value not lower than 24V, namely, during verification, a voltage not lower than 24V is applied between corresponding terminals of the contact.

More preferably, the online check joint signal sampling unit and the intelligent control unit are arranged together.

Further, online check-up contact signal sampling unit with the unit seal is controlled in a cavity or casing to the intelligence.

More preferably, the online verification contact signal sampling unit includes a first connection circuit and a second connection circuit; the first connecting circuit is connected with a contact of the detected gas density relay and a contact signal control circuit, and the second connecting circuit is connected with a contact of the detected gas density relay and the intelligent control unit;

in a non-checking state, the contact is a normally open density relay, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the first connecting circuit is disconnected, the second connecting circuit is communicated, and the contact of the gas density relay is connected with the intelligent control unit; alternatively, the first and second electrodes may be,

in a non-checking state, the contact is a normally closed density relay, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; under the check-up state, contact signal control circuit is closed, and the connection disconnection of gas density relay's contact and contact signal control circuit, second connecting circuit intercommunication will gas density relay's contact with the intelligence is controlled the unit and is connected.

Further, the first connection circuit comprises a first relay, the second connection circuit comprises a second relay, the first relay is provided with at least one normally closed contact, the second relay is provided with at least one normally open contact, and the normally closed contact and the normally open contact keep opposite switch states; the normally closed contact is connected in series in the contact signal control loop, and the normally open contact is connected to the contact of the gas density relay; in a non-checking state, the normally closed contact is closed, the normally open contact is opened, and the gas density relay monitors the output state of the contact in real time; under the check-up state, normally closed contact disconnection, normally open contact is closed, gas density relay's contact passes through normally open contact with the intelligence is controlled the unit and is connected.

Further, the first relay and the second relay are two independent relays, or the same relay.

More preferably, the online check contact signal sampling unit is electrically and optically isolated from the contact of the detected gas density relay.

Preferably, the on-site detection device further comprises a gas density detection sensor, and the gas density detection sensor is provided with an interface communicated with the gas density relay and/or an interface communicated with the pressure adjusting mechanism; the gas density detection sensor is also connected with the intelligent control unit, and transmits the collected pressure value, temperature value and/or gas density value to the intelligent control unit.

More preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay is subjected to contact action or switching, so as to complete online verification of the gas density relay; alternatively, the first and second electrodes may be,

the intelligent control unit acquires a signal of contact action or switching of the gas density relay, the pressure value and the temperature value acquired by the gas density detection sensor are converted into a pressure value corresponding to 20 ℃ according to gas pressure-temperature characteristics, namely the gas density value, and online verification of the gas density relay is completed.

Further, the intelligent control unit calculates the gas density value by using an average method (an average method), wherein the average method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in the whole temperature range to obtain a gas density value; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in the whole pressure variation range to obtain a gas density value; wherein N is a positive integer greater than or equal to 1.

More preferably, the gas density detection sensor is of an integrated structure; or, the gas density detection sensor is a gas density transmitter with an integrated structure.

More preferably, the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density detection sensor using quartz tuning fork technology.

The density detection sensor of the quartz tuning fork technology is characterized in that the constant resonance frequency of a quartz oscillator in vacuum and the resonance frequency difference of a quartz oscillator which is in a same source in gas to be detected are directly proportional to the density of the gas to be detected, and an analog signal or a digital signal of the gas density value is obtained after processing.

Further, the pressure sensor is mounted on a gas path of the gas density relay.

Further, the temperature sensor is installed on or outside the gas path of the gas density relay, or inside the gas density relay, or outside the gas density relay.

Further, the intelligence accuse unit compares ambient temperature value, with the temperature value that temperature sensor gathered, accomplishes the check-up to temperature sensor.

Further, the temperature sensor may be a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple.

Further, the pressure sensor may also be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure sensor with an induction coil in the bawden tube), a resistive pressure sensor (e.g., a pressure sensor with a slide wire resistor in the bawden tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.

Further, the gas density detection sensor comprises at least two pressure sensors, and pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.

Further, the gas density detection sensor comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.

Further, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; randomly arranging and combining the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors, converting the combinations into a plurality of corresponding pressure values at 20 ℃ according to gas pressure-temperature characteristics, namely gas density values, and comparing the gas density values to finish the mutual verification of the pressure sensors and the temperature sensors; or the pressure values acquired by the pressure sensors and the temperature values acquired by the temperature sensors are subjected to all permutation and combination, and each combination is converted into a plurality of corresponding pressure values at 20 ℃ according to the gas pressure-temperature characteristic, namely gas density values, and each gas density value is compared to complete the mutual verification of each pressure sensor and each temperature sensor; or comparing a plurality of gas density values obtained by each pressure sensor and each temperature sensor with comparison density value output signals output by the gas density relay to complete mutual verification of the gas density relay, each pressure sensor and each temperature sensor; or comparing the gas density values, the pressure values and the temperature values obtained by the pressure sensors and the temperature sensors to finish the mutual verification of the gas density relay, the pressure sensors and the temperature sensors.

More preferably, the in-situ detection device comprises at least two gas density detection sensors, each gas density detection sensor comprising a pressure sensor, a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.

More preferably, the in-situ test apparatus automatically performs tests of an absolute pressure type gas density relay and a relative pressure type gas density relay. The absolute pressure structure-absolute pressure display type density relay, the absolute pressure structure-gage pressure display type density relay, the gage pressure structure-absolute pressure display type density relay and the gage pressure structure-gage pressure display type density relay can be tested. In particular, the in-situ detection device includes a relative pressure sensor, and/or an absolute pressure sensor.

More preferably, the intelligent control unit is provided with a connection end for connecting the comparison density value output signal or the comparison pressure value output signal of the gas density relay.

Further, when the detected gas density relay outputs a comparison density value output signal, the intelligent control unit acquires the current gas density value, performs comparison to complete comparison density value verification on the gas density relay, and judges a comparison result through the intelligent control unit or/and a remote background detection system, and if an error is out of tolerance, an abnormal prompt is sent; alternatively, the first and second electrodes may be,

when the detected gas density relay outputs a comparison density value output signal, the intelligent control unit acquires the current gas density value, compares the gas density value and the gas density detection sensor to complete mutual verification of the gas density relay and the gas density detection sensor, judges a comparison result by the intelligent control unit or/and a remote background detection system, and sends an abnormal prompt if an error is out of tolerance; alternatively, the first and second electrodes may be,

when the gas density relay output that is detected compares pressure value output signal, the intelligence is controlled the unit and is gathered pressure value at that time, compares, accomplishes the mutual check-up to gas density relay and gas density detection sensor, and intelligence is controlled unit or/and long-range backstage detecting system and is judged the result of comparison, if the error is out of tolerance, sends unusual suggestion.

Preferably, the on-site detection device further comprises a multi-way joint, the pressure adjusting mechanism is arranged on the multi-way joint, and/or the intelligent control unit is arranged on the multi-way joint.

More preferably, the multi-way joint is provided with a first joint connected with the gas density relay and a second joint connected with the pressure adjusting mechanism, and the first joint is communicated with the second joint inside the multi-way joint.

Furthermore, the multi-way joint also comprises a third joint for connecting a valve, and the third joint is communicated with the first joint and the second joint in the multi-way joint.

Furthermore, a third joint of the multi-way joint is provided with a connecting part butted with electrical equipment, and the valve is embedded in the connecting part.

More preferably, the pressure adjusting mechanism is communicated with the multi-way joint through a connecting pipe.

More preferably, the field test device further comprises a self-sealing valve mounted on the multi-way joint.

Furthermore, the on-site detection device also comprises an air supply interface, and the air supply interface is arranged on the pressure adjusting mechanism; or the air supply interface is arranged on the multi-way joint; or the air supply interface is arranged on the self-sealing valve.

More preferably, the on-site detecting device further comprises a micro water sensor for monitoring the micro water value of the gas on line, the micro water sensor is arranged on the multi-way connector, and the micro water sensor is connected with the intelligent control unit.

Further, on-the-spot detection device still includes gas circulation mechanism, gas circulation mechanism sets up on the expert connects, gas circulation mechanism with the unit is connected is controlled to the intelligence, gas circulation mechanism includes capillary, sealed cavity and heating element, through heating element, realizes that gas flows, the inside little water value of on-line monitoring gas.

Further, the micro water sensor can be installed in a sealed chamber, in a capillary, at a capillary port, outside the capillary of the gas circulation mechanism.

More preferably, the on-site detecting device further comprises a decomposition substance sensor for monitoring a gas decomposition substance on line, the decomposition substance sensor is arranged on the multi-way connector, and the decomposition substance sensor is connected with the intelligent control unit.

Preferably, the field detection device further comprises a data display interface for man-machine interaction, and the current data value can be refreshed in real time; and/or to support data entry, such as entry of parameter settings.

Preferably, the field detection device further comprises a power supply for supplying power to each electric device, wherein the power supply comprises a power supply circuit, or a battery, or a recyclable rechargeable battery, or solar energy, or a transformer for getting power, or an induction power supply.

Preferably, the on-site detection device further comprises a camera for monitoring.

Preferably, the on-site detection device can perform online air supplement.

Preferably, the in situ test device may be capable of on-line gas drying.

Preferably, the field detection device has a self-diagnosis function, and can notify an abnormality in time. Such as a broken wire, a short alarm, a broken sensor, a tendency for gas pressure to rise, etc.

Preferably, the on-site detection device has a safety protection function: when the gas density value or the pressure value is lower than the set value, the verification is automatically not carried out, and an informing signal is sent out.

Preferably, the on-site detection device is further provided with a temperature protection device for the electronic component, and the temperature protection device is used for ensuring that the electronic component can reliably work at low or high ambient temperature.

More preferably, the temperature protection device comprises a heater and/or a heat sink (e.g. a fan), the heater being switched on when the temperature is below a set value and the heat sink (e.g. a fan) being switched on when the temperature is above the set value.

Preferably, the on-site detection device further comprises an analysis system (for example, an expert management analysis system) for detecting, analyzing and judging the gas density value monitoring, the electrical performance of the gas density relay and the monitoring element.

Preferably, the control of the intelligent control unit is controlled by a field control and/or the remote background detection system.

More preferably, the intelligent control unit completes online verification of the gas density relay according to the setting of the remote background detection system or a remote control instruction; or, completing the online verification of the gas density relay according to the set verification time of the gas density relay.

Compared with the prior art, the technical scheme of the utility model following beneficial effect has:

1) the utility model provides a realize gas density relay non-maintaining field detection device, including pressure adjustment mechanism and intelligence accuse unit, control the pressure lift of unit control pressure adjustment mechanism through the intelligence, accomplish the witnessed inspections (monitoring or check-up) to gas density relay, need not maintainer to field operation, realized the non-maintaining to gas density relay. The detection device is compact and reasonable in layout, connection and disassembly of all parts are easy to operate, reliability of a power grid is improved, working efficiency is improved, and cost is reduced.

2) An on-site inspection system including the on-site inspection apparatus is provided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:

FIG. 1 is a schematic structural diagram of an on-site inspection apparatus according to a first embodiment;

FIG. 2 is a schematic structural diagram of the on-site detecting apparatus according to the second embodiment (working state, gas density relay connection);

FIG. 3 is a schematic view of a control circuit (operation state) of the on-site detecting apparatus according to the third embodiment;

FIG. 4 is a schematic structural view of the on-site detecting apparatus according to the fourth embodiment (operating state, connected to the gas density relay);

FIG. 5 is a schematic structural view of an in-situ measuring device according to a fifth embodiment;

FIG. 6 is a schematic structural view of an on-site detecting apparatus according to a sixth embodiment;

FIG. 7 is a schematic configuration diagram of an in-situ measuring apparatus according to a seventh embodiment;

FIG. 8 is a schematic structural view of an on-site detecting apparatus according to an eighth embodiment;

FIG. 9 is a schematic structural view of an in-situ test apparatus according to the ninth embodiment;

FIG. 10 is a schematic configuration diagram of a site inspection apparatus according to a tenth embodiment;

FIG. 11 is a schematic configuration diagram of an in-situ measuring apparatus according to an eleventh embodiment;

FIG. 12 is a schematic structural view of an in-situ measuring apparatus according to a twelfth embodiment;

FIG. 13 is a schematic view of a control circuit of a field testing device according to a thirteenth embodiment;

FIG. 14 is a schematic view of a control circuit of a field testing apparatus according to a fourteenth embodiment;

FIG. 15 is a schematic diagram of the control circuit of a 4-20mA type density transmitter of the in-situ test apparatus of example fifteen;

FIG. 16 is a schematic structural view of a sixteenth field testing device of an embodiment;

FIG. 17 is a schematic diagram of an in-situ test system for a gas density relay, according to the seventeenth embodiment;

FIG. 18 is a schematic diagram of an in-situ testing system of a gas density relay according to the eighteenth embodiment;

fig. 19 is a schematic configuration diagram of an in-situ testing system of a gas density relay according to nineteenth embodiment.

Detailed Description

The utility model provides a field detection device and system of gas density relay, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following reference drawing and example are lifted the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The first embodiment is as follows:

as shown in fig. 1, the on-site detecting device includes a pressure adjusting mechanism 5 and an intelligent control unit 7. The pressure adjusting mechanism 5 is provided with an interface communicated with a gas path of the gas density relay, and the pressure adjusting mechanism 5 is configured to adjust the pressure rise and fall of the gas path of the gas density relay so as to enable the gas density relay to generate contact point action; the intelligent control unit 7 is connected with the pressure regulating mechanism 5 and is configured to realize the control of the pressure regulating mechanism 5; wherein the contact signal comprises an alarm, and/or a latch.

The pressure adjustment mechanism 5 of this embodiment is one end open-ended cavity, be equipped with piston 51 (piston 51 is equipped with sealing washer 510) in the cavity, the one end of piston 51 is connected with an adjusting lever, drive unit 52 is connected to the outer end of adjusting the pole, piston 51's the other end stretches into in the opening, and with the inner wall of cavity contacts, drive unit 52 drive adjust the pole and then drive piston 51 is in the intracavity removes. The driving member 52 includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or step motor), a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.

In a preferred embodiment, the on-site detecting device further comprises a housing (not shown in the figure), and the intelligent control unit 7 and the pressure adjusting mechanism 5 are arranged in the housing.

Example two:

as shown in fig. 2, the on-site detecting device of the present embodiment is additionally provided with a pressure sensor 2, a temperature sensor 3, a valve 4, an on-line check joint signal sampling unit 6, a multi-way joint 9 and an air make-up interface 10 compared with the first embodiment. The valve 4, the pressure sensor 2, the pressure regulating mechanism 5 and the air supply interface 10 are arranged on the multi-way joint 9.

Specifically, in a checking state, an air inlet of the valve 4 is provided with an interface communicated with the electrical equipment, the air inlet is hermetically connected to the electrical equipment and communicated with an air chamber of the electrical equipment, and an air outlet of the valve 4 is communicated with the detected gas density relay 1 through a multi-way connector 9; the pressure sensor 2 is communicated with the gas density relay 1 on a gas path through a multi-way joint 9; the pressure regulating mechanism 5 is communicated with the gas density relay 1 through a multi-way joint 9; the online check contact signal sampling unit 6 is respectively connected with the gas density relay 1 and the intelligent control unit 7; the valve 4, the pressure sensor 2, the temperature sensor 3 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7; the air supply interface 10 is communicated with the multi-way joint 9. In a preferred embodiment, the pressure regulating device 5 communicates with the multi-way connection 9 via a connecting tube.

Wherein, gas density relay 1 includes: a bimetallic strip compensated gas density relay, a gas compensated gas density relay, or a bimetallic strip and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; a density relay with indication (a density relay displayed by a pointer, a density relay displayed by a digital code, a density relay displayed by a liquid crystal) and a density relay without indication (namely a density switch); SF6 gas density relay, SF6 hybrid gas density relay, N2 gas density relay, other gas density relays, and the like.

Pressure sensor 2, comprising: absolute pressure sensors, relative pressure sensors, or both absolute and relative pressure sensors, may be several in number. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).

The temperature sensor 3 may be: a thermocouple, a thermistor, a semiconductor type; contact and non-contact can be realized; can be a thermal resistor and a thermocouple. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.

The valve 4 can be controlled by various transmission modes, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic hydraulic, electrohydraulic, pneumatic hydraulic, spur gear and bevel gear drive; the valve can be operated according to the preset requirement under the action of pressure, temperature or other forms of sensing signals, or can be simply opened or closed without depending on the sensing signals, and the valve can make the opening and closing piece perform lifting, sliding, swinging or rotating motion by depending on a driving or automatic mechanism, so that the size of the flow passage area of the valve can be changed to realize the control function of the valve. The valve 4 can be driven by automatic valves, power-driven valves and manual valves. And the automatic valve may include: electromagnetic drive, electromagnetic-hydraulic drive, electro-hydraulic drive, turbine drive, spur gear drive, bevel gear drive, pneumatic drive, hydraulic drive, gas-hydraulic drive, electric motor (motor) drive. The valve may be automatic or manual, semi-automatic. The verification process can be automatically completed or semi-automatically completed through manual cooperation. The valves are connected, either directly or indirectly, integrally or separately, to the electrical equipment through self-sealing valves, manual valves, or non-removable valves. The valve may be normally open or normally closed, unidirectional or bidirectional, as desired. In short, the air passage is opened or closed through the electric control valve. The electric control valve can adopt the following modes: electromagnetic valve, electric control ball valve, electric control proportional valve, etc.

The basic requirements or functions of the intelligent control unit 7 are as follows: the pair is completed through an intelligent control unit 7The control of the valve 4, the control of the pressure regulating mechanism 5 and the signal acquisition realize that: the pressure value and the temperature value when the contact of the gas density relay 1 acts can be detected and converted into the corresponding pressure value P at 20 DEG C₂₀(density value), that is, contact operating value P of gas density relay 1 can be detected_D20And the checking work of the gas density relay 1 is completed. Alternatively, the density value P at the time of contact operation of the gas density relay 1 can be directly detected_D20And the calibration work of the gas density relay 1 is completed. Of course, the intelligent control unit 7 can also realize: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 7 further comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the calibration of the rated pressure value of the gas density relay 1 is completed. Meanwhile, the self-checking work among the gas density relay 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay 1, and the maintenance-free operation is realized.

Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment.

Example three:

the online check contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification, namely the safe operation of the electrical equipment is not influenced when the contact of the gas density relay 1 acts during the verification; 2) the contact signal control loop of the gas density relay 1 does not influence the performance of the on-site detection device, particularly does not influence the performance of the intelligent control unit 7, and does not damage the on-site detection device or influence the test operation.

As shown in fig. 3, the online verification contact signal sampling unit 6 of the present embodiment is mainly composed of a relay J1(61) and a relay J2 (62). When the pressure value is normal, the contact is a gas density relay of a normally open contact, wherein two pairs of normally closed contacts J11 and J12 of the relay J1(61) are connected in series in a contact signal control loop of the gas density relay 1; two pairs of normally open contacts J21 and J22 of the relay J2(62) are connected to the contacts of the gas density relay 1. It can also be: wherein a pair of normally closed contacts J11 of the relay J1(61) are connected in series in a contact signal control loop of the gas density relay 1; a pair of normally open contacts J21 of the relay J2(62) are connected to the contacts of the gas density relay 1; the relay J1(61) and the relay J2(62) may be integrated, that is, a relay having normally open and normally closed contacts. In short, the utility model can be used in a plurality of pairs, single and flexible combination. The intelligent control unit 7 mainly comprises a processor U1(71) and a power supply U2(72), and the processor U1(71) can be: general purpose computer, industrial computer, CPU, singlechip, ARM chip, AI chip, quantum chip, photon chip, MCU, FPGA, PLC etc., industrial control mainboard, embedded main control board etc. and other intelligent integrated circuit. The power source U2(72) may be a switching power source, ac 220V, dc power source, LDO, programmable power source, solar, battery, rechargeable battery, etc. And the pressure sensor 2 of the pressure acquisition P may be: pressure sensors, pressure transmitters, and the like. The temperature sensor 3 of the temperature acquisition T may be: various temperature sensing elements such as temperature sensors and temperature transmitters. The valve (F)4 may be: solenoid valves, electric valves, pneumatic valves, ball valves, needle valves, regulating valves, shut-off valves, etc. can open and close the gas circuit and even the elements controlling the flow. The valve may be semi-automatic or may be a manual valve. The pressure adjusting mechanism (a)5 may be: the electric adjusting piston, the electric adjusting cylinder, the booster pump, the air cylinder pressurization, the valve, the electromagnetic valve, the flow controller and the like can be semi-automatic or manually adjusted.

The working principle of the embodiment is as follows:

the intelligent control unit 7 of the on-site detection device monitors the gas pressure P and the temperature T of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 and the gas pressureThe force-temperature characteristic is obtained to obtain the corresponding pressure value P at 20 DEG C₂₀(i.e., gas density value). For example, for SF6 gas, the beth-bridgeman equation can be used for the calculation; for the SF6 mixture, the calculation can be performed according to the law of dalton partial pressure, the beth-bridgman equation, the ideal gas state equation.

When it is necessary to verify the gas density relay 1, if the gas density value P is present₂₀Not less than set safety check density value P_SThe field detection device sends out an instruction, namely the intelligent control unit 7 closes the valve 4, so that the gas density relay 1 is isolated from the electrical equipment on the gas path.

Next, the intelligent control unit 7 controls the contact signal control loop of the gas density relay 1 to be opened, that is, the contacts J11 and J12 of the electromagnetic relay J1 of the online verification contact signal sampling unit 6 are opened, so that the safe operation of the electrical equipment is not affected when the gas density relay 1 is verified online, and an alarm signal is not mistakenly sent or the control loop is locked when the gas density relay is verified. Because the on-site detection device already performs the gas density value P before the calibration is started₂₀Not less than set safety check density value P_SThe gas of the electrical equipment is in a safe operation range, and the gas leakage is a slow process and is safe during verification. Meanwhile, the on-site detection device closes the joints J21 and J22 of the electromagnetic relay J2 of the on-line verification joint signal sampling unit 6 under the control of the intelligent control unit 7, and at the moment, the joint P of the gas density relay 1_JIt is connected to the intelligent control unit 7 through the contacts J21 and J22 of the electromagnetic relay J2.

Then, the intelligent control unit 7 controls the driving component 52 of the pressure adjusting mechanism 5 (which can be realized by mainly adopting a motor and a gear, and the mode is various and flexible), and further adjusts the piston 51 of the pressure adjusting mechanism 5, so that the volume of the sealed cavity formed by the piston 51, the gas density relay 1, the valve 4, etc. is changed, the pressure of the gas density relay 1 is gradually reduced, the gas density relay 1 generates the contact action, the contact action is uploaded to the intelligent control unit 7 through the electromagnetic relay J2 of the online check contact signal sampling unit 6,the intelligent control unit 7 converts the pressure value P corresponding to 20 ℃ according to the gas characteristics according to the pressure value P and the temperature T value measured when the contact point acts₂₀(gas density value), the contact point action value P of the gas density relay 1 can be detected_D20After all the contact action values of the alarm and/or locking signals of the gas density relay 1 are detected, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure adjusting mechanism 5 to adjust the piston 51 of the pressure adjusting mechanism 5, so that the pressure of the gas density relay 1 is gradually increased, and the contact return value of the alarm and/or locking of the gas density relay 1 is tested. The field detection device can be repeatedly verified for a plurality of times (for example, 2 to 3 times), and then the average value of the field detection device is calculated, so that the verification work of the gas density relay 1 is completed.

After the verification is completed, the intelligent control unit 7 controls the connection points J21 and J22 of the electromagnetic relay J2 of the online verification connection point signal sampling unit 6 to be disconnected, and at the moment, the connection point P of the gas density relay 1 is connected_JIt is no longer connected to the intelligent control unit 7. Meanwhile, the intelligent control unit 7 controls the valve 4 to be opened, so that the gas density relay 1 is communicated with the electrical equipment on a gas path. The intelligent control unit 7 controls the connection points J11 and J12 of the electromagnetic relay J1 of the online checking connection point signal sampling unit 6 to be closed, and the density monitoring loop of the gas density relay 1 works normally, so that the gas density of the gas density relay 1 can monitor the gas density of the electrical equipment safely, and the electrical equipment can work safely and reliably. Therefore, the online checking work of the gas density relay 1 is conveniently completed, and the safe operation of the electrical equipment cannot be influenced when the gas density relay 1 is checked online.

After the checking work of the gas density relay 1 is finished, the field detection device judges and can inform the detection result, and the mode is flexible. Specifically, the method comprises the following steps: 1) the on-site detection device may be annunciated on-site, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or uploading is implemented through an online remote transmission communication mode, for example, the information can be uploaded to a remote background detection system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In short, after the on-site detection device completes the on-line verification work of the gas density relay 1, if an abnormality occurs, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the on-site detection device completes the on-line calibration work of the gas density relay 1, if there is an abnormality, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay 1 to a remote end (a monitoring room, a background monitoring platform, etc.), and can also display the notice on site. The simple gas density relay on-line calibration can upload abnormal calibration results through an alarm signal line and upload the results according to a certain rule, for example, when the calibration results are abnormal, a contact is connected in parallel with the alarm signal contact and is regularly closed and opened, and the conditions can be obtained through analysis; or through a separate verification signal line. Specifically, the state can be uploaded well, or the state can be uploaded in case of problems, or the verification result can be uploaded through a single verification signal line, or can be displayed on site, can be alarmed on site, or can be uploaded in a wireless mode and can be uploaded through a smart phone network. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the on-site detection device can be fully ensured in multiple modes and various combinations.

The on-site detection device has a safety protection function, namely when the on-site detection device is lower than a set value, the on-site detection device automatically does not perform on-line verification any more and sends out an announcement signal. For example, when the gas density value of the plant is less than the set value P_SThen, it is not verified; only when the gas density value of the equipment is more than or equal to (the alarm pressure value is plus 0.02MPa), the online verification can be carried out.

The on-site detection device may perform on-line verification according to a set time, or may perform on-line verification according to a set temperature (e.g., a high limit temperature, a high temperature, a low limit temperature, a low temperature, a normal temperature, 20 degrees, etc.). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the precision requirement of the on-site detection device is 1.0 grade or 1.6 grade, and the precision requirement of the on-site detection device can be 2.5 grade at high temperature. The method can be implemented according to the relevant standard according to the temperature requirement. For example, the accuracy requirement corresponding to each temperature value in 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code is met. The field detection device can compare the error performance of the field detection device at different temperatures and different time periods. The performance of the gas density relay, the electrical equipment and the field detection device is judged by comparing the gas density relay, the electrical equipment and the field detection device in different periods and within the same temperature range, and the comparison of each period in history and the comparison of the history and the present are realized.

The field detection device can be repeatedly checked for multiple times (for example, 2-3 times), and the average value of the field detection device is calculated according to the checking result of each time. When necessary, the gas density relay 1 can be checked online at any time.

The on-site detection device has the functions of pressure and temperature measurement and software conversion. On the premise of not influencing the safe operation of the electrical equipment, the alarm and/or locking contact action value and/or return value of the gas density relay can be detected on line. Of course, the alarm and/or latch contact return values may not require testing as desired.

The on-site detection device can automatically carry out comparison and judgment when checking, and if the error difference is large, an abnormal prompt is sent out: the gas density relay, the pressure sensor, the temperature sensor and the like have problems, namely the field detection device can complete the mutual verification function of the gas density relay, the pressure sensor, the temperature sensor or the density transmitter; the mutual verification of the gas density relay, the pressure sensor and the temperature sensor can be completed. After the on-site detection device finishes the check work, a check report can be automatically generated, and if the on-site detection device is abnormal, an alarm can be automatically sent out or sent to a specified receiver, for example, a mobile phone; the field detection device can display the gas density value and the verification result on the spot or display the gas density value and the verification result through a background, and the specific mode can be flexible; the system has the functions of real-time online gas density value, pressure value, temperature value and other data display, change trend analysis, historical data query, real-time alarm and the like; the gas density value, or the gas density value, the pressure value and the temperature value can be monitored on line; the alarm has a self-diagnosis function, and can inform abnormity in time, such as line breakage, short circuit alarm, sensor damage and the like; the performance of the gas density relay can be judged by comparing the error performance of the gas density relay at different temperatures and different time periods, namely comparing the error performance of the gas density relay at different periods and in the same temperature range. The system has the functions of comparing historical periods and comparing historical periods with the current period. The self-inspection can be carried out on the field detection device; and judging whether the density values of the gas density relay and the monitored electrical equipment are normal or not. The density value of the electrical equipment, the gas density relay, the pressure sensor, the temperature sensor and the like can be judged, analyzed and compared normally or abnormally, and further the gas density monitoring of the electrical equipment, the judgment, the comparison and the analysis of the states of the on-site detection device and the gas density relay are realized; the gas density monitoring and monitoring system also comprises an analysis system (expert management analysis system) which is used for detecting, analyzing and judging the gas density value monitoring, the gas density relay and the monitoring element, and knowing where the problem point is, whether the electric equipment, the gas density relay or the field detection device has the problem; the contact signal state of the gas density relay is monitored, and the state is remotely transmitted. The contact signal state of the gas density relay can be known to be open or closed at the background, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay can be detected, or detected and judged; the contact resistance of the contact point of the gas density relay can be detected or detected and judged; the system has the functions of data analysis and data processing, and can carry out corresponding fault diagnosis and prediction on the electrical equipment.

As long as the data among the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 are consistent and normal, the field detection device and the gas density relay can be indicated to be normal, so that the gas density relay does not need to be checked, the field detection device does not need to be checked, and the service life can be free from checking. Unless the data of the pressure sensor 2, the temperature sensor 3 and the gas density relay 1 of one electric device in the substation are inconsistent and abnormal, the maintenance personnel are arranged to process the data. And for the anastomotic and normal, the verification is not needed, so that the reliability and the efficiency can be greatly improved, and the cost is reduced.

Example four:

as shown in fig. 4, the field test apparatus of the present embodiment is different from the second embodiment in that:

1) a self-sealing valve 11 is added. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing mode, and the other end of the self-sealing valve 11 is communicated with the multi-way connector 9 through the valve 4.

2) The pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 53 and a drive member 52. The pressure adjusting mechanism 5 makes the driving part 52 push the air bag 53 to change the volume according to the control of the intelligent control unit 7, thereby completing the pressure rise and fall. Through this pressure adjustment mechanism 5 regulated pressure for gas density relay 1 takes place the contact action, and the contact action is transmitted to intelligence through online check-up contact signal sampling unit 6 and is controlled unit 7, and intelligence is controlled unit 7 and is converted into corresponding density value according to pressure value and temperature value when gas density relay 1 takes place the contact action, detects the warning of gas density relay 1 and/or shutting contact action value and/or return value, thereby accomplishes the check-up work to gas density relay 1.

3) The pressure sensor 2 and the temperature sensor 3 are provided in the gas density relay 1.

Example five:

as shown in fig. 5, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9, tonifying qi interface 10, valve 12. One end of the valve 12 is used for being connected to the electrical equipment in a sealing mode, and the other end of the valve 12 is communicated with the multi-way connector 9 through the valve 4. The pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure adjusting mechanism 5 is arranged on the multi-way joint 9, and a driving part 52 of the pressure adjusting mechanism 5 is arranged in a shell 55; the air supplement joint 10 is arranged on the pressure adjusting mechanism 5. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7. During detection, the gas density relay is arranged on a multi-way connector 9 of the on-site detection device, and a gas path of the gas density relay is communicated with the pressure sensor 2 and the pressure adjusting mechanism 5.

Example six:

as shown in fig. 6, the field test apparatus of the present embodiment includes: the device comprises a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air supply interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is used for being connected to electrical equipment in a sealing mode, and the other end of the self-sealing valve 11 is communicated with one end of the valve 4; the other end of the valve 4 is connected with a multi-way joint 9. The pressure sensor 2 and the temperature sensor 3 are arranged together and connected with the multi-way joint 9, and can form a gas density transmitter to directly obtain the density value, the pressure value and the temperature value of gas; the pressure regulating mechanism 5 is connected with the multi-way joint 9; the online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 and the temperature sensor 3 are directly or indirectly connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7.

The pressure adjustment mechanism 5 of the present embodiment is mainly composed of a bellows 54 and a drive member 52. One end of the bellows 54 communicates with the multi-way joint 9, and the other end thereof extends and contracts by the driving of the driving member 52.

During detection, the gas density relay is arranged on the multi-way connector 9 of the on-site detection device, so that the interior of the corrugated pipe 54 is hermetically connected with the gas density relay to form a reliable sealed cavity. The pressure adjusting mechanism 5 makes the driving part 52 push the corrugated pipe 54 to change the volume according to the control of the intelligent control unit 7, and the sealed cavity changes the volume accordingly, thereby completing the lifting of the pressure.

Example seven:

as shown in fig. 7, the present embodiment is different from the sixth embodiment in that:

1) the temperature sensor 3 is arranged near the temperature compensation element inside the casing of the gas density relay to be detected, and of course, can also be arranged together with the pressure sensor 2, and can also be arranged together with the online check contact signal sampling unit 6 and the intelligent control unit 7.

2) The pressure adjustment mechanism body 5 includes a gas chamber 57, a heating element 58 (which may also be a cooling element). The air chamber 57 is communicated with the multi-way joint 9; the heating element 58 is provided outside (or inside) the gas chamber 57; the intelligent control unit 7 is electrically connected with the heating element 58 and used for controlling the heating element 58 to heat (or controlling the refrigeration of the refrigeration element) to cause the temperature of the gas in the gas chamber 57 to change, so as to complete the lifting of the pressure and enable the gas density relay to alarm and/or lock the contact point to act.

The working principle of the embodiment is as follows: when the density relay needs to be checked, the intelligent control unit 7 controls the heating element 58 of the pressure adjusting mechanism 5 to heat, and when the temperature difference between the temperature value in the pressure adjusting mechanism 5 and the temperature value of the temperature sensor 3 reaches a set value, the valve 4 can be closed through the intelligent control unit 7, so that the gas density relay is isolated from the electrical equipment on a gas path; and then immediately turning off the heating element 58 of the adjusting mechanism 5, stopping heating the heating element 58, gradually reducing the pressure of the gas in the sealed gas chamber 57 of the pressure adjusting mechanism 5, so that the gas density relay generates an alarm and/or locking contact action, transmitting the contact action to the intelligent control unit 7 through the online checking contact signal sampling unit 6, and detecting the alarm and/or locking contact action value and/or return value of the gas density relay by the intelligent control unit 7 according to the density value of the alarm and/or locking contact action, thereby completing the checking work of the gas density relay.

Example eight:

as shown in fig. 8, the field test apparatus of the present embodiment includes: the device comprises a first pressure sensor 21, a second pressure sensor 22, a first temperature sensor 31, a second temperature sensor 32, a valve 4, a pressure adjusting mechanism 5, an online checking joint signal sampling unit 6, an intelligent control unit 7, a multi-way joint 9, an air supply interface 10 and a self-sealing valve 11. One end of the self-sealing valve 11 is used for being connected to electrical equipment in a sealing mode, and the other end of the self-sealing valve 11 is connected with the multi-way connector 9 through the valve 4. The second pressure sensor 22, the second temperature sensor 32, the pressure adjusting mechanism 5 and the air supplementing interface 10 are arranged on the multi-way joint 9; the first pressure sensor 21 and the first temperature sensor 31 are provided in the pressure adjustment mechanism 5. The first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 are respectively connected with the intelligent control unit 7. The first pressure sensor 21 and the second pressure sensor 22 are communicated with the pressure adjusting mechanism 5 on an air path; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7. During detection, the gas density relay is arranged on a multi-way connector 9 of the field detection device.

The number of the pressure sensors in this embodiment is two, that is, a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The present embodiment provides a plurality of pressure sensors and temperature sensors for the purpose of: the pressure values monitored by the first pressure sensor 21 and the second pressure sensor 22 can be compared and verified with each other; the temperature values monitored by the first temperature sensor 31 and the second temperature sensor 32 can be compared and verified with each other; the density value P1 obtained by monitoring the first pressure sensor 21 and the first temperature sensor 31₂₀A density value P2 monitored with the second pressure sensor 22 and the second temperature sensor 32₂₀Comparing and checking each other; even the density value Pe of the rated value of the gas density relay 1 can be checked on line₂₀And comparing and checking each other.

Example nine:

as shown in fig. 9, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7, multi-pass joint 9, tonifying qi interface 10, from sealing valve 11, little water sensor 13, decomposition thing sensor 15. One end of the self-sealing valve 11 is used for being connected to gas insulated electrical equipment in a sealing mode, the other end of the self-sealing valve 11 is communicated with one end of the valve 4, and the air supplementing interface 10 is connected to the self-sealing valve 11; the other end of the valve 4 is connected with a multi-way joint 9. The pressure sensor 2, the pressure adjusting mechanism 5, the micro-water sensor 13 and the decomposition product sensor 15 are arranged on the multi-way joint 9; the temperature sensor 3 is provided on the electrical equipment. The online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the micro-water sensor 13, the decomposition product sensor 15 and the intelligent control unit 7 are connected. The valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7.

When the gas density relay is used, the gas density relay is arranged on the multi-way connector 9 of the on-site detection device, and the gas path of the gas density relay is communicated with the pressure sensor 2 and the pressure adjusting mechanism 5.

Example ten:

as shown in fig. 10, the field test apparatus of the present embodiment includes: first pressure sensor 21, second pressure sensor 22, first temperature sensor 31, second temperature sensor 32, valve 4, pressure adjustment mechanism 5, online check connection point signal sampling unit 6, intelligent control unit 7, multi-pass joint 9, tonifying qi interface 10, connector 16. One end of the connector 16 is used for being hermetically connected to the electrical equipment, and the other end of the connector 16 is communicated with one end of the valve 4; and the other end of the valve 4 is connected with the multi-way connector 9, the valve 4 is sealed in the first shell 41, and a control cable of the valve 4 is led out through a first lead-out wire sealing member 42 sealed with the first shell 41, so that the valve 4 is ensured to keep sealed and can work reliably for a long time. The gas density relay 1, the first pressure sensor 21, the first temperature sensor 31, the pressure adjusting mechanism 5 and the air supply interface 10 are arranged on the multi-way joint 9. The pressure adjusting mechanism 5 is sealed in the second shell 55, and a control cable of the pressure adjusting mechanism 5 is led out through a second outgoing line sealing part 56 sealed with the second shell 55, so that the pressure adjusting mechanism 5 is ensured to keep sealed and can work reliably for a long time. The second pressure sensor 22 and the second temperature sensor 32 are disposed on the connection head 16. The first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31, the second temperature sensor 32 and the intelligent control unit 7 are connected; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7.

When in use, the gas density relay is arranged on the multi-way connector 9 of the on-site detection device. When the valve 4 is opened, the first pressure sensor 21, the second pressure sensor 22 and the pressure regulating mechanism 5 are communicated with the gas density relay on a gas path. When the valve 4 is closed, the first pressure sensor 21 and the pressure regulating mechanism 5 are communicated with the gas density relay on the gas path, and the second pressure sensor 22 is not communicated with the gas density relay and the pressure regulating mechanism 5 on the gas path.

In this embodiment, there are two pressure sensors, namely a first pressure sensor 21 and a second pressure sensor 22; the number of the temperature sensors is two, namely a first temperature sensor 31 and a second temperature sensor 32. The field calibration device of this embodiment has the safety protection function, specifically is: 1) when the density values monitored by the first pressure sensor 21 and the first temperature sensor 31 or the second pressure sensor 22 and the second temperature sensor 32 are lower than the set values, the on-site verification device automatically does not perform verification on the gas density relay any more and sends out a notification signal. For example, when the gas density value of the plant is less than the set value, it is not verified. The check can only be carried out when the gas density value of the equipment is not less than (blocking pressure +0.02 MPa). The contact point alarms and has a status indication. 2) Or during the verification, the valve 4 is closed at the moment, and when the density value obtained by monitoring the second pressure sensor 22 and the second temperature sensor 32 is lower than the set value, the on-site verification device automatically does not verify the gas density relay any more, and simultaneously sends out a notification signal (gas leakage). For example, when the gas density value of the plant is less than the set value (lock pressure +0.02MPa), it is not verified. The set value can be set according to the requirementAnd (4) placing. Meanwhile, the on-site calibration device is also provided with a plurality of pressure sensors and temperature sensors for mutual calibration and mutual calibration of the sensors and the gas density relay, so that the on-site calibration device is ensured to work normally. Namely, the pressure values monitored by the first pressure sensor 21 and the second pressure sensor 22 are compared and verified with each other; comparing the temperature values obtained by monitoring by the first temperature sensor 31 and the second temperature sensor 32, and checking each other; the density value P1 obtained by monitoring the first pressure sensor 21 and the first temperature sensor 31₂₀A density value P2 monitored with the second pressure sensor 22 and the second temperature sensor 32₂₀Comparing and checking each other; it is even possible to verify the density value Pe of the nominal value of the gas density relay₂₀And comparing and checking each other.

Example eleven:

as shown in fig. 11, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The air inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, the air outlet of the valve 4 is connected with a pressure adjusting mechanism 5, and the pressure sensor 2 is arranged on the pressure adjusting mechanism 5. Temperature sensor 3, online check-up contact signal sampling unit 6, intelligence accuse unit 7 sets up on pressure adjustment mechanism 5, just temperature sensor 3, online check-up contact signal sampling unit 6, intelligence accuse unit 7 set up together. The pressure sensor 2, the pressure adjusting mechanism 5 and the valve 4 are communicated on a gas path. The pressure sensor 2 and the temperature sensor 3 are connected with the intelligent control unit 7; the valve 4 is connected with an intelligent control unit 7; the pressure adjusting mechanism 5 is connected with an intelligent control unit 7.

When in use, the air passage of the gas density relay is communicated with the air passage on the pressure regulating mechanism 5.

Example twelve:

as shown in fig. 12, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The air inlet of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the air outlet of the valve 4 is communicated with the pressure sensor 2 and the pressure adjusting mechanism 5. And the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with an intelligent control unit 7. On-line check-up contact signal sampling unit 6 and intelligence accuse unit 7 set up on electrical equipment connects, certainly, on-line check-up contact signal sampling unit 6 and intelligence accuse unit 7 also can set up in a casing with pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5.

When the device is used, the pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are arranged on the rear side of the shell of the tested gas density relay, and the gas path of the gas density relay is communicated with the gas path on the pressure adjusting mechanism 5.

Example thirteen:

as shown in fig. 13, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. The pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 and the online check contact signal sampling unit 6 are all connected with the processor 71(U1) of the intelligent control unit 7.

The intelligent control unit 7 further comprises a power supply 72(U2), a communication module 73(U3), an intelligent control unit protection circuit 74(U4), a display and output and operation 75(U5), and a data storage 76 (U6). The processor 71(U1) contains a crystal oscillator and filter circuitry. The intelligent control unit protection circuit 74(U4) includes a surge protection circuit, a filter circuit, a short circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit, and the like. The power supply has 2 grades and also comprises a voltage reduction module. In the communication module 73(U3), the communication chip is connected to the communication interface through the surge protection circuit.

The communication mode of the communication module 73(U3) may be wired: such as RS232, RS485, CAN-BUS and other industrial buses, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; or wireless: such as 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar and the like. The display and output 75(U5) may be: nixie tubes, LEDs, LCDs, HMI, displays, matrix screens, printers, faxes, projectors, mobile phones and the like can be flexibly combined by one or a plurality of types. The data store 76(U6) may be: FLASH memory cards such as FLASH, RAM, ROM, hard disk, SD, etc., magnetic tapes, punched paper tapes, optical disks, U disks, discs, films, etc., can be flexibly combined by one or more types.

Example fourteen:

as shown in fig. 14, the present embodiment differs from embodiment thirteen in that: the intelligent control unit 7 includes a processor 71(U1), a power supply 72(U2), a communication module 73(U3), and an intelligent control unit protection circuit 74 (U4). The pressure sensor 2 passes through the overvoltage protection circuit, the operational amplifier circuit, the modulator circuit, and the filter circuit to the processor 71 (U1).

Example fifteen:

FIG. 15 is a schematic diagram of a 4-20mA type density transmitter circuit for an in situ test setup. As shown in fig. 15, the 4-20Ma density transmitter mainly includes a microprocessor (including a main controller, a crystal oscillator, and a filter circuit), a power supply, a modulation circuit, a current loop, a protection circuit, an analog pressure sensor, an operational amplifier, a temperature sensor, a proportional modulation module, and a voltage reduction module. The microprocessor contains a crystal oscillator and a filter circuit. The protection circuit comprises a surge protection circuit, a filter circuit, a short-circuit protection circuit, a polarity protection circuit, an overvoltage protection circuit and the like. The analog pressure sensor passes through the overvoltage protection circuit and the operational amplification circuit, reaches the modulation circuit, and then passes through the filter circuit to reach the microprocessor, so that the microprocessor can acquire a pressure value and a temperature value, and a density value signal is obtained after calculation and conversion by the microprocessor. The density value signal passes through a proportional modulation module, a modulation circuit and a current loop to obtain the density value of 4-20 Ma. In a word, after passing through an amplifying circuit, the analog pressure sensor, the temperature sensor and the micro-water sensor are converted into A/D (analog to digital) and then into MCU (micro control unit), so that the pressure, temperature and water collection is realized. The intelligent control unit 7 can contain or be connected with a printer and a liquid crystal display, and can also realize USB storage and RS232 communication.

Example sixteen:

as shown in fig. 16, the field test apparatus of the present embodiment includes: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. And the intelligent control unit 7 includes: the pressure control device comprises a processor 71(U1), a power supply 72(U2), a communication module 73(U3), an intelligent control unit protection circuit 74(U4), a valve controller 77(U7), an execution controller 78(U8), a human-computer interface 79(U9), a pressure adjusting mechanism position detector 511 and the like. The execution controller 78(U8), which may also be referred to as a control system, may be provided on the intelligent control unit 7; or the control system part device is arranged on the pressure regulating mechanism 5, and the two are closely matched and fused together.

Example seventeen:

fig. 17 is a schematic diagram of an in-situ detection system of a gas density relay. As shown in fig. 17, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of field detection devices are connected with a remote background detection system sequentially through a concentrator and a protocol converter. Wherein, each field detection device is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride air chamber.

In this embodiment, the remote background detection system PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via HUB 0. Each HUB is connected with a group of field detection devices Z, such as a HUB1 connected with field detection devices Z11, Z12 and … … Z1n, a HUB2 connected with field detection devices Z21, Z22, … … Z2n and … …, and a HUB HUBm connected with field detection devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

The remote background detection system comprises: 1) a background software platform: based on Windows, Linux, and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS, MacOS. 2) A background software key business module: such as rights management, device management, data storage queries, etc., as well as user management, alarm management, real-time data, historical data, real-time profiles, historical profiles, configuration management, data collection, data parsing, record condition, exception handling, etc. 3) Interface configuration: such as Form interface, Web interface, configuration interface, etc.

Example eighteen:

fig. 18 is a schematic diagram of the structure of an on-site detection system of another gas density relay. In this embodiment, a network switch Gateway, an integrated application Server, and a protocol converter/online monitoring intelligent unit ProC are added in comparison with the seventeenth embodiment. In this embodiment, the remote background detection system PC connects two integrated application servers 1 and Server2 through network switch Gateway, two integrated application servers 1 and Server2 communicate with a plurality of protocol converters/online monitoring intelligent units ProC (ProC1, ProC2 and … … ProCn) through station control layer a network and B network, and the protocol converters/online monitoring intelligent units ProC communicate with a plurality of HUB (HUB1, HUB2 and … … HUB) through R5485 network. Each HUB is connected with a group of field detection devices Z, such as a HUB1 connected with field detection devices Z11, Z12 and … … Z1n, a HUB2 connected with field detection devices Z21, Z22, … … Z2n and … …, and a HUB HUBm connected with field detection devices Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.

Example nineteenth:

fig. 19 is a schematic diagram of the structure of an on-site detection system of another gas density relay. The embodiment is a schematic diagram of a wireless transmission mode, and a dashed box in the diagram indicates that the wireless module Wn and the field detection device Zn can be integrated or separated, and the specific scheme can be flexible. The multiple integrated application servers 1, servers 2 and … … servers n wirelessly communicate with the field detection devices through the cloud client, the Wireless Gateway (Wireless Gateway) and the Wireless module of each field detection device. Wherein n is a natural number.

Besides on-line checking of the on-site detection device, the system can monitor physical quantities such as temperature, pressure, density and micro-water of SF6 gas in electrical equipment such as a circuit breaker and a GIS in real time and the variation trend thereof, is provided with a communication interface, uploads data to a remote background detection system, realizes the on-line monitoring function of physical quantities such as SF6 gas density and micro-water of the electrical equipment such as the circuit breaker and the GIS, can flexibly set alarm limits, inquire historical data on site, accurately analyze and judge the gas leakage trend and the gas leakage rate of the equipment, and discover the abnormal condition of the equipment in advance, thereby guaranteeing the safe operation of the whole set of system of the electrical equipment and the transformer substation, and really realizing the on-line monitoring of the electrical equipment of the transformer substation, especially an unattended station. The configuration principle is as follows: the system is constructed by adopting a bus type layered distributed structure, and the requirements of a three-layer system structure of the intelligent substation are met: the system comprises a process layer (a sensor layer, namely a maintenance-free field detection device for the gas density relay), a spacer layer (a data transmission and collection processing layer), and a station control layer (a monitoring host, a database server and the like), wherein the whole system adopts an IEC61850 standard power communication protocol. The remote background detection system is responsible for collecting, comprehensively analyzing, diagnosing faults, storing and forwarding standardized data of monitoring data and has the functions of real-time data display, change trend analysis, historical data query, real-time alarm and the like. The system can realize on-line monitoring of gas density and micro water of high-voltage electrical equipment without on-site, can check and detect a gas density relay on line, can provide a solid basis for the state maintenance of SF6 electrical equipment through expert analysis software, big data analysis and trend analysis, meets the requirements of power grid automation and equipment state maintenance, and plays an important role in improving the safe operation and operation management level of a power grid system, developing prospective diagnosis and trend analysis and reducing unplanned power failure maintenance.

The checking precision can be related to the electric power industry or national standard. Under different temperatures, the calibration requirements can be specified according to national standards or industry standards, for example, according to 4.8 temperature compensation performance rules in DL/T259 sulfur hexafluoride gas density relay calibration regulations, and the accuracy requirements, i.e., the error determination requirements, corresponding to each temperature value are different and can be specified according to standards or otherwise. The comparison and judgment of the same period (or the same season) of different years can be carried out. For example, the checking result of 5 months in 2021 can be directly compared with the checking result of 5 months in 2019 and 5 months in 2020, trend analysis is carried out, and judgment is carried out. The verification can be carried out when the verification is needed, and a movable design can be carried out, namely the operation of the A transformer substation can be carried out for a period of time, after the task is completed, the B transformer substation can be moved to operate for a period of time, and after the task is completed, the C transformer substation can be moved to operate.

The on-site detection device has the advantages that the verification precision can reach 20 degrees and is 0.25 grade, the verification precision can reach 0.625 grade at high temperature or low temperature, the verification precision meets the requirements, and the requirements or related specifications are met economically and quantitatively.

The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.

Claims (71)

1. Realize the on-the-spot detection device of gas density relay non-maintaining, its characterized in that: comprises a pressure adjusting mechanism and an intelligent control unit;

the pressure adjusting mechanism is a closed air chamber, an air vent communicated with an air path of the gas density relay is arranged on the air chamber, a heating element and/or a refrigerating element are arranged outside or inside the air chamber, and the heating element and/or the refrigerating element exchange heat with the gas in the air chamber; alternatively, the first and second electrodes may be,

the pressure adjusting mechanism is a closed air chamber, an air vent communicated with an air path of the gas density relay is arranged on the air chamber, a pressure changing piece is arranged in the air chamber, the pressure changing piece is connected with one end of the reciprocating mechanism, and the other end of the reciprocating mechanism extends out of the air chamber and is connected with a driving part;

the intelligent control unit is connected with the pressure adjusting mechanism and used for receiving and/or calculating the gas density value when the contact of the gas density relay acts.

2. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: when the contact acts, a contact signal is generated, and the contact signal comprises an alarm and/or a locking.

3. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure change member is a piston, or an air bag, or a corrugated pipe.

4. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the driving component comprises one of a magnetic force, a motor, a Carnot cycle mechanism and a pneumatic element.

5. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device further comprises a shell, and the intelligent control unit and the pressure adjusting mechanism are arranged in the shell.

6. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure adjusting mechanism is manually adjusted or automatically adjusted.

7. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit controls the heating of the heating element and/or the refrigeration of the refrigeration element.

8. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the heating element, and/or the cooling element is a semiconductor.

9. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure adjusting mechanism further comprises a heat insulation piece, and the heat insulation piece is arranged outside the air chamber.

10. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: pressure adjustment mechanism's pressure change spare is a piston, the one end of piston is connected with an regulation pole, the outer end of adjusting the pole is stretched out the air chamber and is connected with driver part, the other end of piston with the inner wall sealing contact of air chamber, driver part is in the drive under the control of intelligence accuse unit adjust pole and then drive the piston is in remove in the air chamber.

11. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure change spare of pressure adjustment mechanism is a piston, the piston with the inner wall sealing contact of air chamber, the outside of air chamber is equipped with driver part, driver part is in the control of intelligence accuse unit is pushed down through the electromagnetic force the piston is in remove in the air chamber.

12. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure change spare of pressure adjustment mechanism is an gasbag, reciprocating motion mechanism is a connecting piece that supplies gas business turn over gasbag, drive unit is in the control of intelligence accuse unit drives down the gasbag is bled or is aerifyd the operation.

13. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure change piece of the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the air vent, and the other end of the corrugated pipe stretches under the driving of the driving part.

14. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 13, wherein: the intelligent control unit controls the driving part to drive the corrugated pipe to stretch.

15. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure regulating mechanism is a deflation valve which works under the control of the intelligent control unit; the air release valve is arranged in a closed air chamber, or the air release valve is connected with the closed air chamber.

16. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 15, wherein: the pressure regulating mechanism further comprises a flow valve for controlling gas release flow, and the flow valve works under the control of the intelligent control unit.

17. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure regulating mechanism is a compressor, and the compressor works under the control of the intelligent control unit.

18. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure adjusting mechanism is a pump, and the pump works under the control of the intelligent control unit.

19. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the pressure regulating mechanism is sealed in a cavity or a shell.

20. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the circuit of unit is controlled including the intelligence unit protection circuit is controlled to the intelligence, the intelligence is controlled the unit protection circuit and is included antistatic interference circuit, anti surge circuit, the quick protection circuit of electricity, anti radio frequency field interference circuit, anti pulse crowd interference circuit, power short-circuit protection circuit, power connect reverse protection circuit, electric contact misconnection protection circuit, charge in the protection circuit one or several kinds.

21. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.

22. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or input of analog quantity and digital quantity information.

23. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 22, wherein: the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged and/or preventing electromagnetic interference caused by the misconnection of a user.

24. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit is further provided with a clock, and the clock is used for regularly setting the checking time, or recording the testing time, or recording the event time.

25. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: after the field detection device finishes detection, the intelligent control unit automatically generates a check report of the gas density relay, and if the check report is abnormal, the intelligent control unit automatically gives an alarm and/or uploads the alarm to a remote end and/or sends the alarm to a designated receiver.

26. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit comprises a microprocessor, a human-computer interface, a valve controller, a pressure adjusting mechanism position detection piece and an execution controller.

27. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device also comprises a valve, wherein one end of the valve is provided with an interface communicated with the electrical equipment, and the other end of the valve is provided with an interface communicated with the gas path of the gas density relay and/or an interface communicated with the gas path of the pressure regulating mechanism; the valve is also connected with the intelligent control unit and is closed or opened under the control of the intelligent control unit.

28. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 27, wherein: the valve is an electric valve and/or an electromagnetic valve, or a piezoelectric valve, or a temperature control valve, or a novel valve which is made of an intelligent memory material and is opened or closed by electric heating.

29. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 27, wherein: the valve is closed or opened in a hose bending or flattening mode.

30. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 27, wherein: the valve is sealed within a chamber or housing.

31. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 27, wherein: the valve and the pressure regulating mechanism are sealed within a chamber or housing.

32. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 27, wherein: the valve is closed, the pressure regulating mechanism boosts pressure and increases load, or the pressure regulating mechanism reduces pressure and decreases load, and the change speed of the load is not more than 10 per thousand of the measuring range of the detected gas density relay per second.

33. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 27, wherein: pressure sensors are respectively arranged on two sides of the gas path of the valve; or, the two sides of the air passage of the valve are respectively provided with a pressure or density detector.

34. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device also comprises an on-line checking contact signal sampling unit, wherein the on-line checking contact signal sampling unit is provided with a sampling contact connected with the gas density relay and is configured to sample a contact signal of the gas density relay; the online checking contact signal sampling unit is also connected with the intelligent control unit.

35. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 34, wherein: the online checking contact signal sampling unit is provided with at least two independent sampling contacts, can automatically check at least two contacts of the gas density relay at the same time, and continuously measures without replacing or reselecting the contacts; wherein the content of the first and second substances,

the contact includes one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.

36. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 34, wherein: the online checking contact signal sampling unit is used for testing that the test voltage of the contact action value or the switching value of the detected gas density relay is not lower than 24V, namely, the voltage of not lower than 24V is applied between corresponding terminals of the contact during checking.

37. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 34, wherein: the online check joint signal sampling unit and the intelligent control unit are arranged together.

38. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 37, wherein: the online checking contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.

39. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 34, wherein: the online check joint signal sampling unit comprises a first connecting circuit and a second connecting circuit; the first connecting circuit is connected with a contact of the detected gas density relay and a contact signal control circuit, and the second connecting circuit is connected with a contact of the detected gas density relay and the intelligent control unit;

in a non-checking state, the contact is a normally open density relay, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; in a checking state, the first connecting circuit is disconnected, the second connecting circuit is communicated, and the contact of the gas density relay is connected with the intelligent control unit; alternatively, the first and second electrodes may be,

in a non-checking state, the contact is a normally closed density relay, the second connecting circuit is disconnected or isolated, and the first connecting circuit is closed; under the check-up state, contact signal control circuit is closed, and the connection disconnection of gas density relay's contact and contact signal control circuit, second connecting circuit intercommunication will gas density relay's contact with the intelligence is controlled the unit and is connected.

40. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 39, wherein: the first connecting circuit comprises a first relay, the second connecting circuit comprises a second relay, the first relay is provided with at least one normally closed contact, the second relay is provided with at least one normally open contact, and the normally closed contact and the normally open contact are kept in opposite switch states; the normally closed contact is connected in series in the contact signal control loop, and the normally open contact is connected to the contact of the gas density relay;

in a non-checking state, the normally closed contact is closed, the normally open contact is opened, and the gas density relay monitors the output state of the contact in real time; under the check-up state, normally closed contact disconnection, normally open contact is closed, gas density relay's contact passes through normally open contact with the intelligence is controlled the unit and is connected.

41. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 40, wherein: the first relay and the second relay are two independent relays or the same relay.

42. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 34, wherein: the online check contact signal sampling unit is isolated from the contact of the detected gas density relay in a circuit by photoelectricity.

43. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device also comprises a gas density detection sensor, and the gas density detection sensor is provided with an interface communicated with the gas density relay and/or an interface communicated with the pressure regulating mechanism; the gas density detection sensor is also connected with the intelligent control unit, and transmits the collected pressure value, temperature value and/or gas density value to the intelligent control unit.

44. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 43, wherein: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay is subjected to contact action or switching, and completes online verification of the gas density relay; alternatively, the first and second electrodes may be,

the intelligent control unit acquires a signal of contact action or switching of the gas density relay, the pressure value and the temperature value acquired by the gas density detection sensor are converted into a pressure value corresponding to 20 ℃ according to gas pressure-temperature characteristics, namely the gas density value, and online verification of the gas density relay is completed.

45. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 43, wherein: the gas density detection sensor is of an integrated structure.

46. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 45, wherein: the gas density detection sensor is a gas density transmitter with an integrated structure.

47. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 43, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density detection sensor using quartz tuning fork technology.

48. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 47, wherein: the pressure sensor is arranged on a gas path of the gas density relay;

the temperature sensor is arranged on or outside the gas circuit of the gas density relay, or in the gas density relay, or outside the gas density relay.

49. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 47, wherein: the intelligent control unit compares the environmental temperature value with the temperature value collected by the temperature sensor to complete the check on the temperature sensor.

50. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 47, wherein: the gas density detection sensor comprises at least two pressure sensors, and pressure values acquired by the pressure sensors are compared to complete mutual verification of the pressure sensors.

51. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 47, wherein: the gas density detection sensor comprises at least two temperature sensors, and the temperature values acquired by the temperature sensors are compared to complete mutual verification of the temperature sensors.

52. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 47, wherein: the on-site detection device comprises at least two gas density detection sensors, wherein each gas density detection sensor comprises a pressure sensor and a temperature sensor; and comparing the gas density values detected by the gas density detection sensors to finish the mutual verification of the gas density detection sensors.

53. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 47, wherein: the in-situ test device includes a relative pressure sensor, and/or an absolute pressure sensor.

54. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device further comprises a multi-way joint, the pressure adjusting mechanism is arranged on the multi-way joint, and/or the intelligent control unit is arranged on the multi-way joint.

55. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 54, wherein: the multi-way joint is provided with a first joint connected with the gas density relay and a second joint connected with the pressure adjusting mechanism, and the first joint is communicated with the second joint inside the multi-way joint.

56. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 55, wherein: the multi-way joint further comprises a third joint connected with a valve, and the third joint is communicated with the first joint and the second joint inside the multi-way joint.

57. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 54, wherein: the pressure adjusting mechanism is communicated with the multi-way joint through a connecting pipe.

58. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 54, wherein: the field detection device further comprises a self-sealing valve, and the self-sealing valve is installed on the multi-way connector.

59. The field test device for realizing maintenance-free of a gas density relay as claimed in claim 58, wherein: the on-site detection device also comprises an air supply interface, and the air supply interface is arranged on the pressure adjusting mechanism; or the air supply interface is arranged on the multi-way joint; or the air supply interface is arranged on the self-sealing valve.

60. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device also comprises a data display interface for man-machine interaction, and the current data value can be refreshed in real time; and/or to support data entry, such as entry of parameter settings.

61. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device further comprises a power supply for supplying power to each electric device, wherein the power supply comprises a power supply circuit, or a battery, or a recyclable battery, or solar energy, or a power supply obtained by taking power by a mutual inductor, or an induction power supply.

62. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device also comprises a camera for monitoring.

63. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device can be used for online air supplement.

64. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the in-situ detection device can perform on-line gas drying.

65. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the field detection device has a self-diagnosis function and can inform abnormality in time.

66. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device has a safety protection function: when the gas density value or the pressure value is lower than the set value, the verification is automatically not carried out, and an informing signal is sent out.

67. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the on-site detection device is also provided with a temperature protection device for the electronic components, and is used for ensuring that the electronic components can reliably work at low or high ambient temperature.

68. The field testing device for achieving maintenance-free of a gas density relay of claim 67, wherein: the temperature protection device comprises a heater and/or a radiator, wherein the heater is started when the temperature is lower than a set value, and the radiator is started when the temperature is higher than the set value.

69. The field test device for realizing maintenance-free of the gas density relay as claimed in claim 1, wherein: the intelligent control unit is controlled through field control and/or through a remote background detection system.

70. The field testing device for realizing maintenance-free of a gas density relay as claimed in claim 69, wherein: the intelligent control unit completes online verification of the gas density relay according to the setting of the remote background detection system or a remote control instruction; or, completing the online verification of the gas density relay according to the set verification time of the gas density relay.

71. Realize the on-the-spot detecting system of gas density relay non-maintaining, its characterized in that: the system consists of the field detection device for realizing maintenance-free of the gas density relay, which is disclosed by any one of claims 1 to 70; alternatively, the system comprises the field test apparatus for realizing maintenance-free of the gas density relay as claimed in any one of claims 1 to 70.

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