CN211179416U - Gas density relay with online self-checking function and monitoring device - Google Patents
Gas density relay with online self-checking function and monitoring device Download PDFInfo
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Abstract
The application provides a gas density relay and monitoring devices with online self-checking function for high pressure, middling pressure electrical equipment, including gas density relay body, gas density detection sensor, pressure adjustment mechanism, valve, online check-up contact signal sampling unit and intelligent control unit. Through the lift of pressure adjustment mechanism regulated pressure, make the gas density relay body take place the contact action, the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, the density value when the intelligence is controlled the unit and is acted according to the contact, detect out warning and/or shutting contact signal action value and/or the return value of gas density relay body, accomplish gas density relay's check-up work, need not maintainer to accomplish gas density relay's check-up work to the scene, can also realize non-maintaining, the reliability of electric wire netting has been improved greatly, the efficiency is improved, the cost is reduced.
Description
Technical Field
The utility model relates to an electric power tech field, concretely relates to use on high pressure, middling pressure electrical equipment, have on line from gas density relay and monitoring devices of check-up function.
Background
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 objects, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF2, corrode insulating parts and metal parts, and generate a large amount of heat to increase the pressure of a gas chamber. 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 digitalization and the continuous enhancement of the requirements on remote control and remote measurement, the online monitoring method has important practical significance on the gas density and micro-water content state of SF6 electrical equipment. 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. At present, the online monitoring of the gas density value in the SF6 high-voltage electrical equipment is very common, and for this reason, the application of a gas density monitoring system (gas density relay) is developed vigorously. Whereas current gas density monitoring systems (gas density relays) 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 substation is severe, especially the electromagnetic interference is very strong, in the currently used gas density monitoring system (gas density relay), 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 can transmit information to a target equipment terminal through a contact connecting circuit in time when pressure reaches an alarm, locking or overpressure state, 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 periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the 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 gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been 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 self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, and then the regular checking work of the (mechanical) gas density relay is completed, no maintenance personnel is needed to arrive at the site, the working efficiency is greatly improved, and the cost is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas density relay and monitoring devices with online self-checking function to solve the problem that provides in the above-mentioned technical background.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the first aspect of the present application provides a gas density relay with an online self-checking function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a valve, an online check contact signal sampling unit and an intelligent control unit;
the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
the gas density detection sensor is communicated with the gas density relay body;
the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body at an ambient temperature;
one end of the valve is provided with an interface communicated with electrical equipment, and the other end of the valve is communicated with the gas density relay body, or the other end of the valve is communicated with the gas density relay body through a gas circuit connected with the pressure regulating mechanism;
the intelligent control unit is respectively connected with the gas density detection sensor, the pressure adjusting mechanism, the valve and the online check contact signal sampling unit, and is configured to control the closing or opening of the valve, complete the control of the pressure adjusting mechanism, the collection of pressure values and temperature values and/or the collection of gas density values, and detect contact signal action values and/or contact signal return values of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
The second aspect of the present application provides a gas density monitoring device with an online self-calibration function, comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a valve, an online check contact signal sampling unit and an intelligent control unit;
the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
the gas density detection sensor is communicated with the gas density relay body;
the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body at an ambient temperature;
one end of the valve is provided with an interface communicated with electrical equipment, and the other end of the valve is communicated with the gas density relay body, or the other end of the valve is communicated with the gas density relay body through a gas circuit connected with the pressure regulating mechanism;
the intelligent control unit is respectively connected with the gas density detection sensor, the pressure adjusting mechanism, the valve and the online check contact signal sampling unit, and is configured to control the closing or opening of the valve, complete the control of the pressure adjusting mechanism, the collection of pressure values and temperature values and/or the collection of gas density values, and detect contact signal action values and/or contact signal return values of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
Preferably, the gas density relay body includes, but is not limited to, a bimetal compensated gas density relay, a gas compensated gas density relay, a bimetal 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; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
Preferably, the gas density relay body includes: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators are arranged in the shell; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
More preferably, the air passage of the pressure regulating mechanism is communicated with the pressure detector.
More preferably, the other end of the valve is communicated with the base and the pressure detector, or the other end of the valve is connected with an air passage of the pressure regulating mechanism, so that the valve is communicated with the base and the pressure detector.
More preferably, the online check contact signal sampling unit is connected with the signal generator.
More preferably, the gas density relay body further comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or the display mechanism comprises a digital device or a liquid crystal device with a display of the value.
More preferably, the gas density relay body or the intelligent control unit further comprises a contact resistance detection unit, and the contact resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the gas density relay acts and/or receives an instruction of detecting the contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the gas density relay.
More preferably, the gas density relay body or the intelligent control unit further comprises an insulation resistance detection unit, and the insulation resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the gas density relay is isolated from a control loop of the gas density relay, and when the contact signal of the gas density relay acts and/or receives an instruction of detecting the contact insulation resistance, the insulation resistance detecting unit can detect the contact insulation resistance value of the gas density relay.
Preferably, the gas density detection sensor is provided on the gas density relay body; or the pressure regulating mechanism is arranged on the gas density relay body; or the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or, pressure adjustment mechanism gas density detection sensor online check-up contact signal sampling unit with the intelligence is controlled the unit and is set up on the gas density relay body.
More preferably, the gas density relay body and the gas density detection sensor are of an integrated structure; or the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
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, online check joint signal sampling unit, the intelligence accuse unit sets up on the gas density transmitter.
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.
More preferably, the pressure sensor is mounted on an air path of the gas density relay body.
More preferably, the temperature sensor is installed on or outside the gas path of the gas density relay body, or inside the gas density relay body, or outside the gas density relay body.
More preferably, 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.
More preferably, at least one of the temperature sensors is arranged near or on or integrated in a temperature compensation element of the gas density relay body. Preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay body, which is close to the temperature compensation element.
More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor, and/or an absolute pressure sensor.
Further, when the pressure sensor is an absolute pressure sensor, the absolute pressure value is used for representing the pressure sensor, the calibration result is the corresponding absolute pressure value at 20 ℃, the relative pressure value is used for representing the calibration result, and the calibration result is converted into the corresponding relative pressure value at 20 ℃; when the pressure sensor is a relative pressure sensor, the relative pressure value is used for representing, the verification result is the corresponding relative pressure value at 20 ℃, the absolute pressure value is used for representing, and the verification result is converted into the corresponding absolute pressure value at 20 ℃; the conversion relation between the absolute pressure value and the relative pressure value is as follows:
Pabsolute pressure＝PRelative pressure+PStandard atmospheric pressure。
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.
Preferably, the online check joint signal sampling unit and the intelligent control unit are arranged together.
More preferably, the online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
Preferably, the pressure regulating mechanism is sealed within a chamber or housing.
Preferably, during verification, the pressure adjusting mechanism is a closed air chamber, a heating element and/or a refrigerating element is arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased.
More preferably, the heating element, and/or the cooling element is a semiconductor.
More preferably, the pressure adjusting mechanism further comprises a heat insulating member, and the heat insulating member is arranged outside the closed air chamber.
Preferably, during verification, the pressure adjusting mechanism is a cavity with an opening at one end, and the other end of the cavity is communicated with the gas density relay body; the cavity is internally provided with a piston, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod and then drives the piston to move in the cavity.
Preferably, during verification, the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber, the piston is in sealing contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force.
Preferably, the pressure adjusting mechanism is an air bag having one end connected to a driving member, the air bag is driven by the driving member to generate a volume change, and the air bag is communicated with the gas density relay body.
Preferably, the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the driving of the driving part.
The driving component of the pressure adjusting mechanism includes, but is not limited to, one of a magnetic force, a motor (variable frequency motor or stepping motor), a reciprocating mechanism, a carnot cycle mechanism, and a pneumatic element.
Preferably, the pressure regulating mechanism is a purge valve.
More preferably, the pressure regulating mechanism further comprises a flow valve controlling the gas release flow rate.
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 pressure regulating mechanism is a pump; the pump includes, but is not limited to, one of a build pump, a boost pump, an electric air pump, and an electromagnetic air pump.
Preferably, the valve is an electrically operated valve; or an electromagnetic valve; or a permanent magnetic electromagnetic valve; or a piezoelectric valve; or a temperature controlled valve; or a novel valve which is made of intelligent memory materials and is opened or closed by electric heating.
Preferably, the valve is closed or opened in a hose bending or flattening mode.
Preferably, the valve is sealed within a chamber or housing.
Preferably, the valve and the pressure regulating mechanism are sealed within a chamber or housing.
Preferably, pressure sensors are respectively arranged on two sides of the air path of the valve.
The electrical equipment preferably comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmental protection gas electrical equipment, or other insulating gas electrical equipment, and specifically, the electrical equipment comprises GIS, GI L, PASS, circuit breakers, current transformers, voltage transformers, gas-filled cabinets, ring main units.
Preferably, the valve is in communication with the electrical device through an electrical device connection fitting.
Preferably, the online verification contact signal sampling unit samples the contact signal of the gas density relay body to satisfy the following conditions: the online check contact signal sampling unit is provided with at least two groups of independent sampling contacts, can automatically check at least two contacts simultaneously, and continuously measures without replacing the contacts or reselecting the contacts; wherein, the contact includes, but is not limited to one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.
Preferably, the online verification contact signal sampling unit is used for testing the contact signal action value or the switching value of the contact signal action value of the gas density relay body to be not lower than 24V, namely, during verification, the voltage of not lower than 24V is applied between corresponding terminals of the contact signal.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to gas density, accomplish promptly the on-line monitoring of gas density relay to the electrical equipment who monitors.
More preferably, the intelligent control unit calculates the gas density value by using an average method (averaging 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 all temperature ranges 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.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, so as to complete online verification of the gas density relay; or, intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay's online check-up.
Preferably, the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; or, the gas density relay body has the comparison pressure value output signal, should compare pressure value output signal with the intelligence is controlled the unit and is connected.
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 P L C, an industrial control motherboard, an embedded main control board and the like, and includes all peripherals, logic, input and output.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface completes 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 gas density relay (or monitoring device) supports the input of basic information of the gas density relay, wherein the basic information comprises, but is not limited to, one or more of factory number, precision requirement, rated parameter, manufacturing plant and operation position.
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 includes, but is not limited to, one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a P L C power carrier and a cable.
Further, the wireless communication mode includes, but is not limited to, one or more of NB-IOT, 2G/3G/4G/5G, WIFI, bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar.
Preferably, a clock is further arranged on the intelligent control unit, and the clock is configured to be used for regularly setting the verification time of the gas density relay, or recording the test time, or recording the event time.
Preferably, the control of the intelligent control unit is controlled through a field control and/or a background control.
More preferably, the gas density relay with the online self-checking function completes online checking of the gas density relay according to the setting or the instruction of the background; or, completing the online verification of the gas density relay according to the set verification time of the gas density relay.
Preferably, the gas density relay with the online self-checking function further comprises a multi-way joint, and the gas density relay body, the valve and the pressure adjusting mechanism are arranged on the multi-way joint; or the valve and the pressure regulating mechanism are arranged on the multi-way joint; or the gas density relay body, the gas density detection sensor, the valve and the pressure adjusting mechanism are arranged on the multi-way joint.
More preferably, the gas density relay with the online self-checking function further comprises a first connecting pipe, and the gas path of the pressure regulating mechanism is communicated with the gas density relay body through the first connecting pipe; the first interface of the multi-way joint is communicated to the part of the first connecting pipe between the gas density relay body and the pressure adjusting mechanism.
More preferably, the valve communicates to a second port of the multi-way junction and communicates with the gas density relay body through the multi-way junction.
More preferably, the valve comprises an interface communicated with electrical equipment, a first interface communicated to the multi-way joint; the gas density relay body is communicated with the multi-way connector through the valve; and the second interface of the multi-way joint is used for connecting electrical equipment.
More preferably, the temperature sensor is communicated to the air passage of the multi-way joint or communicated to the third interface of the multi-way joint.
Preferably, the gas density relay with the online self-checking function further comprises a self-sealing valve, wherein the self-sealing valve is installed between the electrical equipment and the valve; alternatively, the valve is mounted between the electrical device and the self-sealing valve.
Preferably, the gas density relay with the online self-checking function further comprises a gas supplementing interface; the air supply interface is arranged on the pressure adjusting mechanism; or the air supply interface is arranged on the electrical equipment; or, the air make-up interface is disposed between the electrical device and the valve; or the air supplementing interface is arranged on a second connecting pipe, and the second connecting pipe is communicated with the valve and the air passage of the pressure regulating mechanism, or the second connecting pipe is communicated with the valve and the gas density relay body.
Preferably, the gas density relay with an online self-checking function further comprises: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current verification data in real time and/or supports data input.
Preferably, the gas density relay with an online self-checking function further comprises: and the micro water sensor is respectively connected with the gas density relay body and the intelligent control unit.
More preferably, the gas density relay with an online self-checking function further includes: gas circulation mechanism, gas circulation mechanism respectively with the gas density relay body with the unit is connected is controlled to the intelligence, gas circulation mechanism includes capillary, sealed cavity and heating element.
Further, the micro water sensor can be installed in a sealed chamber of the gas circulation mechanism, in a capillary, at a capillary port, and outside the capillary.
Preferably, the gas density relay with online self-checking function still includes the decomposition thing sensor, decomposition thing sensor respectively with gas density relay body with the intelligence is controlled the unit and is connected.
Preferably, the gas density relay with the online self-checking function further comprises a camera for monitoring.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
the application provides a gas density relay with online self-checking function for high pressure, middling pressure electrical equipment, including gas density relay body, gas density detection sensor, pressure adjustment mechanism, valve, online check-up contact signal sampling unit and intelligence accuse unit. The valve is closed through the intelligent control unit, so that the gas density relay body is isolated from the electrical equipment on a gas path; through the lift of pressure adjustment mechanism regulated pressure for the contact action takes place for gas density relay body, the contact action is transmitted the intelligence through online check-up contact signal sampling unit and is controlled the unit, density value when the intelligence is controlled the unit and is acted according to the contact, detect out warning and/or shutting contact signal action value and/or the return value of gas density relay body, need not the maintainer to the on-the-spot check-up work that just can accomplish gas density relay, the reliability of electric wire netting has been improved, the efficiency is improved, the cost is reduced. Simultaneously, can also carry out the mutual self-calibration between gas density relay body and the gas density detection sensor through the intelligence accuse unit, realize the non-maintaining of the gas density relay who has online self-calibration function. Simultaneously the utility model discloses the whole check-up process of technique realizes SF6Zero emission of gas and meeting the requirements of environmental protection regulations.
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 a gas density relay with an online self-checking function according to a first embodiment;
FIG. 2 is a schematic structural diagram of a gas density relay with an online self-checking function according to a second embodiment;
FIG. 3 is a schematic structural diagram of a gas density relay with an online self-checking function according to a third embodiment;
FIG. 4 is a schematic structural diagram of a gas density relay with an online self-checking function according to a fourth embodiment;
FIG. 5 is a schematic structural diagram of a gas density relay with an online self-checking function according to a fifth embodiment;
FIG. 6 is a schematic structural diagram of a gas density relay with an online self-checking function according to a sixth embodiment;
FIG. 7 is a schematic structural diagram of a gas density relay with an online self-calibration function according to a seventh embodiment;
FIG. 8 is a schematic structural diagram of a gas density relay with an online self-calibration function according to an eighth embodiment;
FIG. 9 is a schematic structural diagram of a gas density relay with an online self-calibration function according to the ninth embodiment;
fig. 10 is a schematic structural view of a gas density relay with an online self-checking function according to the tenth embodiment;
FIG. 11 is a schematic structural view of a gas density relay with an online self-checking function according to an eleventh embodiment;
fig. 12 is a schematic structural diagram of a gas density relay having an online self-checking function according to a twelfth embodiment.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples. 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, a gas density relay or a gas density monitoring device with an online verification function includes a gas density relay body 1, where the gas density relay body 1 includes: the temperature-compensating device comprises a shell 101, and a base 102, an end seat 108, a pressure detector 103, a temperature compensating element 104, a plurality of signal generators 109, a movement 105, a pointer 106 and a dial 107 which are arranged in the shell 101. One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, the other end of the temperature compensation element 104 is provided with a beam, and the beam is provided with an adjusting piece which pushes the signal generator 109 and enables a contact of the signal generator 109 to be switched on or off. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the core 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The gas density relay body 1 may further include a digital device or a liquid crystal device having an indication display.
In addition, the gas density relay with the online verification function further comprises: pressure sensor 2, temperature sensor 3, valve 4, pressure adjustment mechanism 5, online check-up contact signal sampling unit 6, intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint 1010, and the other end of the valve 4 is communicated with the base 102; the pressure sensor 2 is communicated with a pressure detector 103 on an air path; the pressure adjusting mechanism 5 is communicated with the pressure detector 103; the online check contact signal sampling unit 6 is respectively connected with the signal generator 109 and the intelligent control unit 7; the valve 4 and the pressure regulating mechanism 5 are also respectively connected with an intelligent control unit 7.
The signal generator 109 comprises a microswitch or a magnetic auxiliary electric contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 comprises a bourdon tube or a bellows; the temperature compensation element 104 is a temperature compensation sheet or a gas enclosed in a housing. The gas density relay of the present application may further include: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge.
In the gas density relay according to the first embodiment, the pressure detector 103 is used to correct the changed pressure and temperature by using the temperature compensation element 104, so as to reflect the change of the sulfur hexafluoride gas density. Under the pressure of the measured medium sulfur hexafluoride (SF6), due to the action of the temperature compensation element 104, when the density value of the sulfur hexafluoride gas changes, the pressure value of the sulfur hexafluoride gas also changes correspondingly, so that the end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the displacement is transmitted to the movement 105 by means of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, and the density value of the sulfur hexafluoride gas to be measured is indicated on the dial 107. The signal generator 109 serves as an output alarm lockout contact. Therefore, the gas density relay body 1 can display the density value of the sulfur hexafluoride gas. If the sulfur hexafluoride gas density value is reduced due to air leakage, the pressure detector 103 generates corresponding downward displacement and transmits the downward displacement to the movement 105 through the temperature compensation element 104, the movement 105 transmits the downward displacement to the pointer 106, the pointer 106 moves towards the direction with small indication value, and the air leakage degree is specifically displayed on the dial 107; meanwhile, the pressure detector 103 drives the beam to move downwards through the temperature compensation element 104, the adjusting piece on the beam gradually leaves the signal generator 109, and when the adjusting piece on the beam reaches a certain degree, the contact of the signal generator 109 is connected to send out a corresponding contact signal (alarm or lock), so that the sulfur hexafluoride gas density in equipment such as an electrical switch and the like is monitored and controlled, and the electrical equipment can work safely.
If the gas density value is increased, namely the pressure value of sulfur hexafluoride gas in the sealed gas chamber is greater than the set pressure value of the sulfur hexafluoride gas, the pressure value is correspondingly increased, the tail end of the pressure detector 103 and the temperature compensation element 104 generate corresponding upward displacement, the temperature compensation element 104 enables the beam to also displace upwards, the adjusting piece on the beam displaces upwards and pushes the contact of the signal generator 109 to be disconnected, and the contact signal is released.
In the above embodiments, the valve 4 may be various, and may be a cut-off valve, such as a ball valve, a butterfly valve, a gate valve, a stop valve, a plug valve, a butterfly valve, a needle valve, a diaphragm valve, etc. If the ball valve, the self-sealing valve core can be rotated to drive the ball valve to close the air passage of the switch device, and the self-sealing valve can be flexibly designed according to actual requirements. The valve 4 is automatic and can be verified manually or semi-manually.
Type of pressure sensor 2: can be an absolute pressure sensor, a relative pressure sensor, or an absolute pressure sensor and a relative pressure sensor, and the number can be several. 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 can be a thermocouple, a thermistor or 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 online check contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 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. When the contact signal of the gas density relay body 1 acts during the calibration, the safe operation of the electrical equipment cannot be influenced; 2) the contact signal control loop of the gas density relay body 1 does not influence the performance of the gas density relay, particularly does not influence the performance of the intelligent control unit 7, and does not cause the gas density relay to be damaged or influence the test work.
The basic requirements or functions of the intelligent control unit 7 are as follows: the control of the valve 4, the control of the pressure regulating mechanism 5 and the signal acquisition are completed through the intelligent control unit 7. The realization is as follows: can detect the pressure value and temperature value when the contact signal of the gas density relay body 1 acts, and convert the pressure value and temperature value into the corresponding pressure value P at 20 DEG C20(density value), that is, the contact operating value P of the gas density relay body 1 can be detectedD20And the calibration work of the gas density relay body 1 is completed. Alternatively, the density value P at the time of the contact signal operation of the gas density relay body 1 can be directly detectedD20And the calibration work of the gas density relay body 1 is completed. Meanwhile, the self-checking work among the gas density relay body 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 body 1, and the maintenance-free operation is realized. 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 output signal of gas density relay body 1, the density value at that time is gathered simultaneously to intelligence accuse unit 7, accomplishes the rated pressure value check-up of gas density relay body 1.
Specifically, the electrical equipment comprises GIS, GI L, PASS, circuit breakers, current transformers, voltage transformers, gas-filled cabinets, ring main units and the like.
Gas density relay body 1, 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 multi-pass connect 9 between can set up in a flexible way as required. For example, the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 may be provided together; or the valve 4 and the pressure regulating mechanism 5 may be provided together; in short, the arrangement between them can be flexibly arranged and combined. Can be as required, gas density relay body, gas density detection sensor, pressure adjustment mechanism, valve, online check-up contact signal sampling unit and intelligent control unit can carry out the nimble setting between them.
The working principle of the gas density relay with the online checking function for checking and monitoring is as follows:
the intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P20(i.e., gas density value). When the density relay 1 needs to be checked, if the gas density value P is detected at the moment20Not less than set safety check density value PS(ii) a The gas density relay issues a command, i.e. the valve 4 is closed by the intelligent control unit 7, so that the gas density relay body 1 is isolated from the electrical equipment on the gas path. Then, the intelligent control unit 7 disconnects the control loop of the gas density relay body 1, so that the safe operation of the electrical equipment cannot be influenced when the gas density relay body 1 is checked on line, and an alarm signal cannot be sent by mistake or the control loop cannot be locked when the gas density relay body is checked. Because the gas density value P of the gas density relay is already carried out before the calibration is started20Not less than set safety check density value PSThe gas of the electrical equipment is in a safe operation range, and the gas leakage is a slow process and is safe during verification. Simultaneously, the unit 7 is controlled to intelligence intercommunication gas density relay body 1's contact sampling circuit, then, the unit 7 is controlled to intelligence drive assembly 52 (can mainly adopt motor and gear to realize, its mode is various, it is nimble), make by pressure adjustment mechanism 5, gas density relay body 1, the seal chamber that valve 4 etc. are constituteed takes place the volume change, the gaseous pressure of gas density relay body 1 progressively descends, make density relay 1 take place the contact action, its contact action passes to intelligence control unit 7 through on-line check-up contact signal sampling unit 6, intelligence control unit 7 is according to connecingThe pressure value and temperature value measured during point action are converted into pressure value P corresponding to 20 deg.C according to gas characteristics20(density value), the contact point action value P of the gas density relay body 1 can be detectedD20After the contact action values of the alarm and/or locking signals of the gas density relay body 1 are detected, the intelligent control unit 7 controls the driving part 52 of the pressure adjusting mechanism 5 to gradually increase the pressure of the gas density relay body 1, and the return values of the alarm and/or locking contact signals of the gas density relay body 1 are tested. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay body 1 is completed. Then, the intelligent control unit 7 disconnects the contact sampling circuit of the gas density relay body 1, and at this time, the contact of the gas density relay body 1 is not connected to the intelligent control unit 7. Meanwhile, the valve 4 is opened through the intelligent control unit 7, so that the gas density relay body 1 is communicated with the electrical equipment on a gas path. Through the control circuit of unit 7 intercommunication gas density relay body 1 is controlled to the intelligence, the normal work of density monitoring circuit of gas density relay body 1, and gas density of gas density relay body 1 safety monitoring electrical equipment makes gas equipment work safe and reliable. Therefore, the online checking work of the gas density relay body 1 can be conveniently completed, and the safe operation of the electrical equipment can not be influenced when the gas density relay body 1 is checked online.
After the gas density relay body 1 completes the checking work, the gas density relay judges and CAN report the detection result, the mode is flexible, specifically, 1) the gas density relay CAN report the checking work locally, for example, the checking work is displayed through an indicator light, a number or a liquid crystal, 2) or the gas density relay CAN upload through an online remote transmission communication mode, for example, the gas density relay CAN upload to the background of an online monitoring system, 3) or upload to a specific terminal through a wireless upload, for example, a mobile phone CAN be uploaded wirelessly, 4) or upload through other ways, 5) or upload an abnormal result through an alarm signal line or a special signal line, 6) upload alone or bind with other signals, in a word, after the gas density relay completes the online checking work of the gas density relay, if the abnormal state exists, the gas density relay CAN automatically send an alarm and upload to a remote end, or CAN send to a specific receiver, for example, the remote receiver through a wireless communication mode, such as an infrared communication signal, an infrared communication mode, a wireless communication mode, a mode.
The gas density relay has a safety protection function, and particularly, when the gas density relay is lower than a set value, the gas density relay automatically does not perform online verification on the density relay any more and sends an announcement signal. For example, when the gas density value of the plant is less than the set value PSIt is not verified. For example: 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 gas density relay can be checked on line according to set time, or can be checked on line according to set temperature (such as limit high temperature, limit low temperature, normal temperature, 20 degrees and the like). when the environment temperature of high temperature, low temperature, normal temperature and 20 degrees is checked on line, the error judgment requirement is different, for example, when the environment temperature of 20 degrees is checked, the accuracy requirement of the gas density relay is 1.0 grade or 1.6 grade, and the accuracy requirement of the gas density relay is 2.5 grade at high temperature.
The gas density relay can compare the error performance of the gas density relay at different temperatures and different time periods. Namely, the performances of the gas density relay and the electrical equipment are judged by comparing the temperature ranges in different periods. The comparison of each period with history and the comparison of the history and the present are carried out. The gas density relay can be repeatedly verified for multiple times (for example, 2-3 times), and the average value of the gas density relay is calculated according to the verification result of each time. When necessary, the gas density relay can be checked on line at any time. Meanwhile, the density relay can also monitor the gas density value, and/or the pressure value, and/or the temperature value of the electrical equipment on line, and upload the gas density value, and/or the pressure value, and/or the temperature value to target equipment to realize on-line monitoring.
Example two:
as shown in fig. 2, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1 (the gas density relay body 1 mainly comprises a shell, and a base, a pressure detector, a temperature compensation element, a machine core, a pointer, a dial, an end seat, a plurality of signal generators and an electrical equipment connecting joint which are arranged in the shell), a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7.
One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint 1010, and the other end of the valve 4 is communicated with the base of the gas density relay body 1 and the pressure detector. The pressure sensor 2, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on or in the shell of the gas density relay body 1, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path; the pressure regulating mechanism 5 is communicated with a pressure detector of the gas density relay body 1; 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 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.
What distinguishes from the first embodiment is that the pressure adjustment mechanism 5 of this embodiment is the one end open-ended cavity, there is piston 51 in the cavity, piston 51 is equipped with sealing washer 510, piston 51's one end is connected with an adjusting lever, drive unit 52 is connected to the outer end of adjusting lever, piston 51's the other end stretches into in the opening, and with the inner wall of cavity contacts, drive unit 52 drives adjust the lever and then drive piston 51 is in the cavity removes, makes the sealed portion in the cavity take place the volume change, and then accomplishes the lift of pressure. 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 another preferred embodiment, the pressure regulating mechanism 5 may also be a solenoid valve sealed inside a housing. The pressure regulating mechanism 5 controls the intelligent control unit 7 to open the electromagnetic valve, so that pressure changes and pressure rise and fall are completed.
In another preferred embodiment, the pressure adjusting mechanism 5 may also be composed of a bellows and a driving part 52, and the bellows and the pressure detector of the gas density relay body 1 are hermetically connected together to form a reliable sealed cavity. The pressure adjusting mechanism 5 controls the intelligent control unit 7, so that the driving part 52 pushes the corrugated pipe to change in volume, and then the sealed cavity changes in volume, thereby completing pressure rise and fall.
In another preferred embodiment, the pressure adjusting mechanism 5 may also be composed of a gas chamber, a heating element and a heat insulating member, wherein the heating element is provided outside (or inside) the gas chamber, and the temperature is changed by heating, thereby completing the pressure rise and fall.
Of course, the pressure adjusting mechanism 5 may have various other forms, which are not limited to the above-mentioned forms, and other mechanisms capable of realizing the pressure lifting function are also covered in the protection scope of the present application.
Through this pressure adjustment mechanism 5 regulation pressure for the contact action takes place for the signal generator of gas density relay body 1, the contact action is transmitted to intelligence through online check contact signal sampling unit 6 and is controlled unit 7, the gas density value when intelligence is controlled unit 7 and is taken place the contact action according to gas density relay body 1, perhaps convert into corresponding gas density value according to pressure value and temperature value, detect the warning of gas density relay and/or block contact signal action value and/or return value, accomplish gas density relay's check-up work. Or the checking work of the gas density relay is finished as long as the alarm and/or the locking contact action value is obtained through detection.
Example three:
as shown in fig. 3, in this embodiment, a gas supply port 10 and a self-sealing valve 11 are added as compared with the second embodiment. One end of the self-sealing valve 11 is connected to the electrical equipment in a sealing manner, and the other end of the self-sealing valve 11 is communicated with one end of the valve 4 and the air supply interface 10 through a connecting pipe.
Example four:
as shown in fig. 4, a gas density relay or a gas density monitoring device with an online self-checking function is distinguished from the second embodiment in that: the other end of the valve 4 is connected with the air passage of the pressure regulating mechanism 5 through a connecting pipe, so that the valve 4 is communicated with the base of the gas density relay body 1 and the pressure detector. Of course, the fourth embodiment can also add an air supply interface and a self-sealing valve. For example, one end of the self-sealing valve is connected to the electrical equipment in a sealing manner, and the other end of the self-sealing valve is communicated with one end of the valve 4 and the air supply interface through a connecting pipe.
Example five:
as shown in fig. 5, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the other end of the valve 4 is communicated with the base of the gas density relay body 1, the pressure sensor 2 and the pressure adjusting mechanism 5. The pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjusting mechanism 5 are disposed on the rear side of the housing of the gas density relay body 1. And the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged on the electrical equipment connecting joint. The pressure sensor 2 is communicated with the pressure detector on the gas path through a base of the gas density relay body 1; the pressure adjusting mechanism 5 is communicated with the pressure detector of the gas density relay body 1. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with the intelligent control unit 7. Different from the first embodiment, the pressure sensor 2, the temperature sensor 3, the valve 4, and the pressure adjusting mechanism 5 are disposed on the housing rear side of the gas density relay body 1.
Example six:
as shown in fig. 6, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connector, the other end of the valve 4 is communicated with a connecting pipe, the connecting pipe is communicated with a pressure detector of the gas density relay body 1, and the pressure sensor 2 and the pressure adjusting mechanism 5 are also communicated with the connecting pipe, so that the valve 4, the pressure sensor 2, the pressure adjusting mechanism 5 and the pressure detector are communicated on a gas path. The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged in a shell; 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.
In distinction from the first embodiment, the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5, the online check contact signal sampling unit 6 and the intelligent control unit 7 are disposed in one housing. 1) The pressure adjustment mechanism 5 of the present embodiment is mainly composed of a piston 51 and a drive member 52. The piston 51 is hermetically connected with the pressure detector of the gas density relay body 1 and the pressure sensor 2 to form a reliable sealed cavity. The pressure adjusting mechanism 5 makes the driving component 52 push the piston 51 to move according to the control of the intelligent control unit 7, so that the volume of the sealed cavity changes, and the pressure rise and fall are completed. 2) The pressure sensor 2 and the temperature sensor 3 are arranged in a shell, and can also be formed into a gas density transmitter, so that the density value, the pressure value and the temperature value of gas can be directly obtained.
Example seven:
as shown in fig. 7, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the other end of the valve 4 is communicated with the pressure detector of the gas density relay body 1. The gas density relay body 1, the temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path; the pressure regulating mechanism 5 is communicated with the pressure detector of the gas density relay body 1 on the gas path. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are respectively connected with the intelligent control unit 7.
In contrast to the first embodiment, the pressure adjustment mechanism 5 of the present embodiment is mainly composed of an air bag 53 and a driving 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.
Example seven:
as shown in fig. 8, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the other end of the valve 4 is communicated with the pressure detector of the gas density relay body 1. The pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay body 1, and the pressure sensor 2 is communicated with a pressure detector of the gas density relay body 1 on a gas path. The pressure adjusting mechanism 5 is communicated with a pressure detector of the gas density relay body 1. 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.
In contrast to the first embodiment, the valve 4 is sealed inside the first housing 41, and the control cable of the valve 4 is led out through the first lead-out wire seal 42 sealed with the first housing 41, so that the design ensures that the valve 4 remains sealed and can operate reliably for a long time. 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 casing 55 and the first casing 41 may be integrated into one body.
Example nine:
as shown in fig. 9, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, the other end 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, intelligent control unit 7, gas density relay body 1 set up on pressure adjustment mechanism 5. The pressure detector of the gas density relay body 1, the pressure sensor 2, the pressure adjusting mechanism 5 and the valve 4 are communicated on a gas path. The temperature sensor 3, the online checking contact signal sampling unit 6 and the intelligent control unit 7 are arranged together. 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.
Example ten:
as shown in fig. 10, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1, 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 contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, and the other end of the valve 4 is communicated with the pressure adjusting mechanism 5. The gas density relay body 1, the temperature sensor 31, the online check contact signal sampling unit 6 and the intelligent control unit 7 are arranged together and are arranged on the pressure adjusting mechanism 5; the first pressure sensor 21 is provided on the pressure adjustment mechanism 5. The second pressure sensor 22 and the second temperature sensor 32 are provided on the side of the valve 4 to which the electrical connection terminals are connected. The first pressure sensor 21 and the pressure detector of the gas density relay body 1 are communicated with the pressure adjusting mechanism 5 on a gas path; the first pressure sensor 21, the second pressure sensor 22, the first temperature sensor 31 and the second temperature sensor 32 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.
Different from the first 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 temperature sensor 32 may also be omitted in this embodiment. The embodiment of the utility model provides a ten gas density relays that have online check function have a plurality of pressure sensor and temperature sensor, can compare, check each other between the pressure value that a plurality of pressure sensor monitoring obtained; the temperature values obtained by the plurality of temperature sensors can be compared and verified mutually; the corresponding gas density values obtained by monitoring the pressure sensors and the temperature sensors can be compared and verified with each other.
Example eleven:
as shown in fig. 11, a gas density relay or a gas density monitoring device with an online self-calibration function includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure adjusting mechanism 5, an online checking contact signal sampling unit 6 and an intelligent control unit 7. One end of the valve 4 is hermetically connected to the electrical equipment through an electrical equipment connecting joint, the other end of the valve 4 is communicated with a connecting pipe, and the connecting pipe is communicated with a pressure detector of the gas density relay body 1. The pressure sensor 2 and the pressure adjusting mechanism 5 are also communicated with the connecting pipe, so that the valve 4, the pressure sensor 2, the pressure adjusting mechanism 5 and the pressure detector are communicated on a gas path. The temperature sensor 3 is provided on the side of the valve 4 to which the electrical connection joint is connected. The online check joint signal sampling unit 6 and the intelligent control unit 7 are arranged together. The pressure sensor 2, the temperature sensor 3, the valve 4 and the pressure adjusting mechanism 5 are connected with the intelligent control unit 7.
Further, the pressure adjusting mechanism 5 of the present embodiment is mainly composed of a piston 51 and a driving member 52. One end of the piston 51 is hermetically connected with the gas density relay body 1 to form a reliable sealed cavity. The pressure adjusting mechanism 5 drives the piston 51 to move according to the control of the intelligent control unit 7, so that the volume of the sealed cavity changes, and the pressure rise and fall are completed. The driving part 52 is arranged outside the sealed cavity, the piston 51 is arranged inside the sealed cavity, and the driving part 52 uses electromagnetic force to push the piston 51 to move, namely the piston 51 is moved by the magnetic force between the piston 51 and the driving part 52.
Example twelve:
in the above embodiment, a multi-way joint 9 may be further included. As shown in fig. 12, a gas density relay or a gas density monitoring device with an online self-checking function is additionally provided with a gas supplementing interface 10 and a multi-way joint 9 on the basis of an eleventh embodiment. The valve 4 is communicated with an interface of the electrical equipment and communicated to a first interface of the multi-way joint 9; the gas density relay body 1 is communicated with a multi-way joint 9 through a valve 4; the second interface of the multi-way connector 9 is used for connecting electrical equipment. The air supply interface 10 and the temperature sensor 3 are also respectively arranged on the multi-way joint 9.
The mounting position of the multi-way joint 9 can be flexibly arranged according to the requirement. For example, the gas path of the pressure regulating mechanism 5 is communicated with the gas density relay body 1 through a first connecting pipe; the first interface of the multi-way joint 9 is communicated to the part of the first connecting pipe between the gas density relay body 1 and the pressure regulating mechanism 5. The valve 4 is communicated with a second interface of the multi-way joint 9 and is communicated with the gas density relay body 1 through the multi-way joint 9. In addition, when the gas density relay with the online self-checking function comprises a micro-water sensor, the micro-water sensor can also be arranged on the multi-way joint 9; when the gas density relay with the online self-checking function comprises the decomposition product sensor, the decomposition product sensor can also be arranged on the multi-pass connector 9; when the gas density relay with the online self-checking function comprises the gas supplementing interface, the gas supplementing interface can also be arranged on the multi-way connector 9, and the gas supplementing interface is not listed.
A gas density relay with on-line self-checking function generally refers to that its component elements are designed into an integral structure; the gas density monitoring device generally refers to that the components of the gas density monitoring device are designed into a split structure and flexibly formed.
To sum up, the utility model provides a pair of gas density relay with online self-checking function comprises gas circuit (can be through the pipeline) coupling part, pressure regulation part, signal measurement control part etc. and the primary function is that the contact signal (the pressure value when warning/shutting action) of gas density relay under the ambient temperature carries out online check-up measurement to the corresponding pressure value when automatic conversion becomes 20 ℃, the performance testing to the contact (warning and shutting) value of gas density relay is realized on line. The installation positions of the gas density relay, the pressure sensor, the temperature sensor, the pressure regulating mechanism, the valve, the online checking contact signal sampling unit and the intelligent control unit can be flexibly combined. For example: the gas density relay body, the pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together, integrally designed and also can be designed in a split mode; can be arranged on the shell or on the multi-way joint, and can also be connected together through a connecting pipe. The valve can be directly connected with electrical equipment, or can be connected with the electrical equipment through a self-sealing valve or an air pipe. The pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together and are designed integrally; the pressure sensor and the temperature sensor can be combined together and are designed integrally; the online check joint signal sampling unit and the intelligent control unit can be combined together to realize integrated design. In short, the structure is not limited.
When the contact of the density relay is verified at the ambient temperature of high temperature, low temperature, normal temperature and 20 ℃, the requirement for error judgment of the density relay can be different, and the method can be implemented according to the temperature requirement and the related standard; the error performance of the density relay can be compared in different time periods at different temperatures according to the density. I.e., comparisons over the same temperature range at different times, a determination is made as to the performance of the density relay. The comparison of each period with history and the comparison of the history and the present are carried out. The density relay body can also be subjected to physical examination. When necessary, the density relay contact signals can be checked at any time; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay body. The density value of the electrical equipment, the gas density relay body, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, the density relay body and the like, can be judged, compared and analyzed; 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 in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay body can be detected or detected and judged; the contact resistance of the contact point of the gas density relay body can be detected or detected and judged; and the insulation performance of the gas density relay body is also detected, or detected and judged.
The anti-rust and anti-vibration device is compact and reasonable in structural arrangement, good in anti-rust and anti-vibration capacity of each part, firm in installation and reliable in use. The connection, the dismouting of each pipeline of gas density relay are easily operated, and equipment and part are convenient to be maintained. The gas density relay calibration device can complete the calibration work of the gas density relay without a maintainer going to the site, greatly improves the reliability of a power grid, improves the efficiency and reduces the cost.
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 (37)
1. A gas density relay with an online self-checking function is characterized by comprising: the gas density relay comprises a gas density relay body, a gas density detection sensor, a pressure regulating mechanism, a valve, an online check contact signal sampling unit and an intelligent control unit;
the gas path of the pressure regulating mechanism is communicated with the gas density relay body; the pressure adjusting mechanism is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body generates contact signal action;
the gas density detection sensor is communicated with the gas density relay body;
the online check contact signal sampling unit is connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body at an ambient temperature;
one end of the valve is provided with an interface communicated with electrical equipment, and the other end of the valve is communicated with the gas density relay body, or the other end of the valve is connected with a gas path of the pressure regulating mechanism, so that the valve is communicated with the gas density relay body;
the intelligent control unit is respectively connected with the gas density detection sensor, the pressure adjusting mechanism, the valve and the online check contact signal sampling unit, and is configured to control the closing or opening of the valve, complete the control of the pressure adjusting mechanism, the collection of pressure values and temperature values and/or the collection of gas density values, and detect contact signal action values and/or contact signal return values of the gas density relay body;
wherein the contact signal comprises an alarm, and/or a latch.
2. The gas density relay with the online self-checking function according to claim 1, wherein the gas density relay body comprises: the device comprises a shell, a base, a pressure detector, a temperature compensation element and a plurality of signal generators, wherein the base, the pressure detector, the temperature compensation element and the signal generators are arranged in the shell; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
3. A gas density relay with an on-line self-checking function according to claim 2, characterized in that: the gas path of the pressure regulating mechanism is communicated with the pressure detector; the other end of the valve is communicated with the base and the pressure detector, or the other end of the valve is connected with an air path of the pressure adjusting mechanism, so that the valve is communicated with the base and the pressure detector; and the online check contact signal sampling unit is connected with the signal generator.
4. A gas density relay with an on-line self-checking function according to claim 2, characterized in that: the gas density relay body also comprises a display mechanism, the display mechanism comprises a movement, a pointer and a dial, and the movement is fixed on the base or in the shell; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is arranged on the movement and in front of the dial, and the pointer is combined with the dial to display the gas density value; and/or
The display mechanism comprises a digital device or a liquid crystal device with a display value display.
5. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density detection sensor is arranged on the gas density relay body; or,
the pressure adjusting mechanism is arranged on the gas density relay body; or,
the gas density detection sensor, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay body; or,
the pressure adjusting mechanism gas density detection sensor online check contact signal sampling unit with the intelligence is controlled the unit and is set up on the gas density relay body.
6. The gas density relay with the online self-checking function according to claim 5, wherein: the gas density relay body and the gas density detection sensor are of an integrated structure; or the gas density relay body and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
7. The gas density relay with the online self-checking function according to claim 1, characterized in that: 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.
8. The gas density relay with the online self-checking function according to claim 7, wherein: the online checking contact signal sampling unit is arranged on the gas density transmitter.
9. The gas density relay with the online self-checking function according to claim 1, characterized in that: 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; or,
a density detection sensor adopting quartz tuning fork technology.
10. A gas density relay with an on-line self-checking function according to claim 9, characterized in that: the pressure sensor is arranged on the gas path of the gas density relay body.
11. A gas density relay with an on-line self-checking function according to claim 9, characterized in that: the temperature sensor is arranged on or outside the gas path of the gas density relay body, or in the gas density relay body, or outside the gas density relay body.
12. A gas density relay with an on-line self-checking function according to claim 9, characterized in that: the pressure sensor includes a relative pressure sensor, and/or an absolute pressure sensor.
13. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online check joint signal sampling unit and the intelligent control unit are arranged together.
14. A gas density relay with an on-line self-checking function according to claim 13, wherein: the online checking contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
15. The gas density relay with the online self-checking function according to claim 1, characterized in that: the pressure regulating mechanism is sealed in a cavity or a shell.
16. The gas density relay with the online self-checking function according to claim 1, characterized in that: during verification, the pressure adjusting mechanism is a closed air chamber, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating through the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay is increased or decreased; or,
the pressure adjusting mechanism is a cavity with one end opened, and the other end of the cavity is communicated with the gas density relay body; a piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod to further drive the piston to move in the cavity; or,
the pressure adjusting mechanism is a closed air chamber, a piston is arranged in the closed air chamber and is in sealed contact with the inner wall of the closed air chamber, a driving part is arranged outside the closed air chamber, and the driving part pushes the piston to move in the cavity through electromagnetic force; or,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the gas density relay body; or,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the gas density relay body, and the other end of the corrugated pipe stretches under the driving of the driving part; or,
the pressure adjusting mechanism is a deflation valve which is an electromagnetic valve or an electric valve; or,
the pressure regulating mechanism is a compressor; or,
the pressure adjusting mechanism is a pump, and the pump comprises one of a pressurizing pump, an electric air pump and an electromagnetic air pump;
wherein, the driving part comprises one of a magnetic force, a motor, a reciprocating mechanism, a Carnot cycle mechanism and a pneumatic element.
17. A gas density relay with an on-line self-checking function according to claim 16, wherein: the pressure regulating mechanism further comprises a heat insulation piece, and the heat insulation piece is arranged outside the closed air chamber.
18. The gas density relay with the online self-checking function according to claim 1, characterized in that: 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.
19. The gas density relay with the online self-checking function according to claim 1, characterized in that: the valve is sealed within a chamber or housing.
20. The gas density relay with the online self-checking function according to claim 1, characterized in that: the valve and the pressure regulating mechanism are sealed within a chamber or housing.
21. The gas density relay with the online self-checking function according to claim 1, characterized in that: the online checking contact signal sampling unit samples the contact signal of the gas density relay body to meet the following requirements:
the online check contact signal sampling unit is provided with at least two groups of independent sampling contacts, can automatically check at least two contacts simultaneously, and continuously measures without replacing the contacts or reselecting the contacts; wherein,
the contact includes one of warning contact, warning contact + shutting 1 contact + shutting 2 contact, warning contact + shutting contact + superpressure contact.
22. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or, the intelligence accuse unit acquires the pressure value and the temperature value that gas density detection sensor gathered accomplish the on-line monitoring of gas density relay to the electrical equipment who monitors.
23. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or switching, and completes online verification of the gas density relay; or,
the intelligence accuse unit acquires when the gas density relay body takes place contact signal action or switches the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish gas density relay's online check-up.
24. The gas density relay with the online self-checking function according to claim 1, characterized in that: the gas density relay body is provided with a comparison density value output signal which is connected with the intelligent control unit; or,
the gas density relay body has the pressure value output signal of comparing, should compare pressure value output signal with the intelligence is controlled the unit and is connected.
25. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is provided with an electrical interface, the electrical interface completes 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.
26. The gas density relay with the online self-checking function as claimed in claim 1, wherein the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or checking results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.
27. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is also provided with a clock, and the clock is configured to be used for regularly setting the verification time of the gas density relay, or recording the test time, or recording the event time.
28. The gas density relay with the online self-checking function according to claim 1, characterized in that: the intelligent control unit is controlled through field control and/or background control.
29. The gas density relay with the online self-checking function according to claim 1, further comprising: the gas density relay body, the valve and the pressure adjusting mechanism are arranged on the multi-way joint; or,
the valve and the pressure adjusting mechanism are arranged on the multi-way joint; or,
the gas density relay body, the gas density detection sensor, the valve and the pressure adjusting mechanism are arranged on the multi-way joint.
30. A gas density relay with on-line self-checking function according to claim 29, wherein: the gas circuit of the pressure regulating mechanism is communicated with the gas density relay body through the first connecting pipe; the first interface of the multi-way joint is communicated to the part of the first connecting pipe between the gas density relay body and the pressure adjusting mechanism.
31. A gas density relay with on-line self-checking function according to claim 29, wherein: the valve is communicated to a second interface of the multi-way joint and communicated with the gas density relay body through the multi-way joint.
32. A gas density relay with on-line self-checking function according to claim 29, wherein: the valve is communicated with an interface of the electrical equipment and communicated to a first interface of the multi-way joint; the gas density relay body is communicated with the multi-way connector through the valve; and the second interface of the multi-way joint is used for connecting electrical equipment.
33. The gas density relay with the online self-checking function according to claim 1, further comprising: a self-sealing valve mounted between the electrical equipment and the valve; alternatively, the valve is mounted between the electrical device and the self-sealing valve.
34. The gas density relay with the online self-checking function according to claim 1, further comprising: a gas supplementing interface;
the air supply interface is arranged on the pressure adjusting mechanism; or,
the air supply interface is arranged on the electrical equipment; or,
the air make-up interface is arranged between the electrical equipment and the valve; or,
the air supply interface is arranged on a second connecting pipe, the second connecting pipe is communicated with the valve and the air passage of the pressure regulating mechanism, or the second connecting pipe is communicated with the valve and the gas density relay body.
35. The gas density relay with the online self-checking function according to claim 1, further comprising: and the display interface is used for man-machine interaction, is connected with the intelligent control unit, displays the current verification data in real time and/or supports data input.
36. The gas density relay with the online self-checking function according to claim 1, further comprising: respectively with the gas density relay body with the little water sensor that the unit is connected is controlled to the intelligence, and/or respectively with the gas density relay body with the decomposition thing sensor that the unit is connected is controlled to the intelligence.
37. The utility model provides a gas density monitoring devices with online self-checking function which characterized in that: the gas density monitoring device is composed of a gas density relay with an online self-checking function as claimed in any one of claims 1-36; or, the gas density monitoring device comprises a gas density relay with an online self-checking function as claimed in any one of claims 1-36.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921457532.2U CN211179416U (en) | 2019-09-04 | 2019-09-04 | Gas density relay with online self-checking function and monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501260A (en) * | 2019-09-04 | 2019-11-26 | 上海乐研电气有限公司 | A kind of gas density relay and its method of calibration with online self checking function |
| CN115507735A (en) * | 2022-11-22 | 2022-12-23 | 山东天厚新材料科技有限公司 | Copper foil thickness measuring probe and probe head thereof |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501260A (en) * | 2019-09-04 | 2019-11-26 | 上海乐研电气有限公司 | A kind of gas density relay and its method of calibration with online self checking function |
| CN110501260B (en) * | 2019-09-04 | 2024-07-23 | 上海乐研电气有限公司 | Gas density relay with online self-checking function and checking method thereof |
| CN115507735A (en) * | 2022-11-22 | 2022-12-23 | 山东天厚新材料科技有限公司 | Copper foil thickness measuring probe and probe head thereof |
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