CN211179406U - Gas density monitor with contact signal output and system - Google Patents
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Abstract
The application discloses gas density monitor and system with contact signal output includes: the pressure sensor and the temperature sensor are used for acquiring pressure and temperature signals, and the corresponding gas density value is obtained through the processing of the intelligent microprocessor, so that the implementation is realizedThe gas density values of the electrical equipment are now monitored. And when the gas density value of the monitored electrical equipment is lower than or higher than the set density value, the first electronic signal contact outputs a first notification contact signal to inform operation and maintenance personnel of accurate information of gas leakage in time. The gas density value that this application can accurate monitoring electrical equipment in time discovers gas leakage, and the safe operation of guarantee electric wire netting has reduced the SF that leaks to the atmosphere6Gas, convenient site construction and installation and low investment cost.
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 contact signal output's gas density monitor and system.
Background
At present, SF6(sulfur hexafluoride) electrical equipment is widely applied to the power sector and industrial and mining enterprises, and rapid development of the 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 SF (sulfur hexafluoride) is6Electrical equipment is used more and more. SF6The gas has functions of arc extinction and insulation in high-voltage electrical equipment, and SF in the high-voltage electrical equipment6The SF is seriously influenced by the reduction of the density of the gas and the excessive micro-water content6Safe operation of high-voltage electrical equipment: SF6The reduction of the gas density to a certain extent will lead to a reduction or loss of the insulation and arc extinguishing properties.
Detection of SF6The equipment adopted when the electric product leaks gas is generally a gas density relay, the inside of the equipment is provided with a contact and a control loop corresponding to the contact, when the gas pressure is reduced to an alarm value, the contact of the gas density relay acts to generate a contact signal, and the control loop sends out an alarm signal according to the contact signal. At present, the commonly used gas density relay is a mechanical type, such as the gas density relay disclosed in the applicant's previous patent CN108231475B, etc., which includes a base, a pressure detector, a temperature compensation element, a signal generator and an equipment connection joint, and the mechanical type gas density relayThe relay is not precise enough to operate when the pressure changes slightly, so that when an alarm signal is given, the SF signal is sent6Much of the gas has leaked. For example SF with a nominal pressure of 0.6MPa6The electrical equipment generally adopts a gas density relay with alarm pressure of 0.52Mpa and locking pressure of 0.50 Mpa. When the gas leaks and the pressure is reduced to between 0.6MPa and 0.52MPa, the mechanical gas density relay cannot act, namely, a gas leakage alarm cannot be sent out.
Many substations are now unattended substations, and for such SF6For the electrical equipment, if gas leakage occurs, only when the gas is reduced from the rated pressure of 0.6Mpa to the alarm pressure of 0.52Mpa, the operator on duty can find the gas leakage and inform the maintainer to deal with the leakage accident on site, and at the moment, the SF gas leakage happens6Much gas is leaked, which is not beneficial to environmental protection and economic benefit.
In addition, currently, remote density relays are utilized to perform online SF monitoring6Gas density values in high voltage electrical equipment have also found many applications, particularly in new substations. However, in old substations already in operation, remote density relays are used for on-line monitoring of SF6The gas density value in the high-voltage electrical equipment needs to be constructed and arranged by a power line and a communication line, so that the cost is high, the potential safety hazard is large, the difficulty is high, and the power failure problem is involved.
Based on the above problems, there is a need to develop an SF capable of accurately monitoring electrical equipment6The gas density monitor has the advantages of convenient field construction and installation and low investment cost, and can overcome the defects of mechanical SF6The problem of inaccurate measurement of the gas density relay can be solved, and the problems of large investment and inconvenient site construction can be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas density monitor and system with contact signal output installs on current mechanical type gas density relay, or is used for reforming transform current mechanical type gas density relay to solve the problem that proposes in the above-mentioned technical background.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect of the present application, a gas density monitor having a junction signal output is provided.
In a second aspect of the present application there is provided a gas density monitoring system having a junction signal output, the system being formed by or including a gas density monitor having a junction signal output as described in the first aspect.
A gas density monitor with a junction signal output as described herein, comprising: the intelligent temperature control system comprises a pressure sensor, a temperature sensor, an intelligent microprocessor, a first electronic signal contact and an equipment connecting joint;
the two ends of the first electronic signal contact are respectively provided with a connecting point which is used for being connected to the contact of a gas density relay of the monitoring electrical equipment in parallel or in series; or the two ends of the first electronic signal contact are respectively provided with a connecting point which is used for being connected in parallel or in series to a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment;
the intelligent microprocessor is respectively connected with the pressure sensor and the temperature sensor and is used for acquiring a pressure value acquired by the pressure sensor and a temperature value acquired by the temperature sensor and processing the pressure value and the temperature value to obtain a corresponding gas density value P20；
The intelligent microprocessor directly or indirectly controls the first electrical signal connection when the monitored gas density value P is reached20Lower or higher than the set density value P20 setThen, the first electronic signal contact outputs a first notification contact signal; or,
at set time intervals, when the monitored gas density value P20Trend change value △ P of20Lower or higher than the set trend density value △ P20 setThen, the first electronic signal contact outputs a first notification contact signal; or,
at set time intervals, when the monitored gas density value P20Average value P of20 averageIs lower thanOr above a set average value of density P20 average settingThen, the first electronic signal contact outputs a first notification contact signal.
Preferably, the first notification contact signal comprises an alarm, or/and a latch.
Preferably, the intelligent microprocessor compares the gas density value P according to the gas pressure-temperature characteristic20Converted to a pressure value corresponding to 20 ℃.
Preferably, the first electronic signal contact includes at least one first normally-open switch, and two ends of the first normally-open switch are respectively provided with a connection point for connecting in parallel to a contact of a gas density relay of the monitoring electrical equipment, or for connecting in parallel to a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-open density relay; or,
the first electronic signal contact comprises at least one first normally-closed switch, connecting points are respectively arranged at two ends of the first normally-closed switch and are used for being connected in series with the contact of the gas density relay of the monitoring electrical equipment or connected in series with a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-closed density relay.
Preferably, the first electronic signal contact comprises one or more of an electromagnetic relay, a solid state relay, a time relay, a power relay, a thyristor, an electronic switch, an electric contact, an optical coupler, DI, a MOS field effect transistor, a triode, a diode and a MOS FET relay.
Preferably, the set density value P20 setThe density value is set according to the requirement, or the density value is detected in a set time period in the past.
Preferably, the set density value P20 setCan be modified and stored online.
Preferably, the monitor further comprises a second electronic signal contact, and two ends of the second electronic signal contact are respectively provided with a connecting point for connecting to a contact of a gas density relay of the monitoring electrical equipment in parallel or in series; or the two ends of the second electronic signal contact are respectively provided with a connecting point which is used for being connected in parallel or in series to a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment;
when the gas pressure value of the monitored electrical equipment is lower than or higher than the set pressure value PSetting upThen, the second electronic signal contact outputs a second notification contact signal; or,
when the gas temperature value of the monitored electrical equipment is lower than or higher than the set temperature value TSetting upThen, the second electronic signal contact outputs a second notification contact signal; or,
when the gas temperature value reaches the set temperature threshold value TSetting a threshold valueAnd the gas pressure value of the monitored electrical equipment is lower than or higher than the set pressure value PSetting upThen, the second electronic signal contact outputs a second notification contact signal.
More preferably, the second electronic signal contact includes at least one second normally-open switch, two ends of the second normally-open switch are respectively provided with a connection point for connecting in parallel to a contact of a gas density relay of the monitoring electrical equipment, or connecting in parallel to a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-open density relay; or,
the second electronic signal contact comprises at least one second normally-closed switch, two ends of the second normally-closed switch are respectively provided with a connecting point for being connected in series with a contact of a gas density relay of the monitoring electrical equipment or a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-closed density relay.
More preferably, said set pressure value PSetting upThe pressure value is set according to the requirement, or the pressure value detected in the past set time period; the set temperature value TSetting upIs set according to the requirement, or is detected within a set time period
Further, theSet pressure value PSetting upTemperature value TSetting upCan be modified and stored online.
More preferably, the second notification contact signal comprises an alarm, and/or a latch-up.
More preferably, the second electronic signal contact includes one or more of an electromagnetic relay, a solid state relay, a time relay, a power relay, a thyristor, an electronic switch, an electrical contact, an optical coupler, DI, a MOS field effect transistor, a triode, a diode, and a MOS FET relay.
Preferably, the monitor communicates with the electrical device through the device connection fitting.
Preferably, the pressure sensor and the temperature sensor are of an integrated structure.
Preferably, the intelligent microprocessor calculates the gas density value by using an average value method (mean value method), where the average value method is: setting the collection frequency in a set time interval, and carrying out average calculation processing on all the collected N gas density values at different time points to obtain a gas density value P20Average value P of20 average(ii) a Or setting temperature interval step length in a set time interval, and carrying out average value calculation processing on density values of N different temperature values acquired in all temperature ranges to obtain a gas density value P20Average value P of20 average(ii) a Or setting pressure interval step length in a set time interval, and carrying out average value calculation processing on density values of N different pressure values acquired in all pressure variation ranges to obtain a gas density value P20Average value P of20 average(ii) a Wherein N is a positive integer greater than or equal to 1.
More preferably, in the averaging method, the obviously abnormal gas density value is deleted first, and specifically, the gas density value outside the set reasonable interval range can be deleted by setting the reasonable interval range; or deleting at least one maximum value, and/or deleting at least one minimum value.
Preferably, the trend change value △ P20Comprises the following steps: at the position ofSetting collection frequency in a certain time interval, and calculating the average value of N gas density values of different time points obtained by all the collections to obtain the gas density value P20Average value P of20 averageThen, a trend calculation period T is setPeriod of timeObtaining a trend change value △ P20＝P20 average (previous T period value)-P20 average (T period)I.e. the mean value P20 averageFront-back period TPeriod of timeA difference of (d); or,
at a set time interval TSpacerValue P of gas density monitored20Trend change value △ P of20＝P20 (previous T interval)-P20(T interval)I.e. density value P20Front-to-back time interval TSpacerA difference of (d); or,
setting a time interval TSpacerSetting the time length TLength ofAt a set time interval TSpacerSetting the collection frequency, and collecting all the N gas density values P obtained at different time points20Performing accumulation calculation to obtain an accumulated value ∑P20Obtaining a trend change value △ P20＝∑P20 (previous T length)-∑P20 (when T length)I.e. the time length T before and afterLength ofAccumulated value ∑P20The difference between them;
wherein N is a positive integer greater than or equal to 1.
Preferably, the intelligent microprocessor is used for controlling the gas density value P at certain intervals20Fourier transform is carried out, the frequency spectrum is converted into a corresponding frequency spectrum, and periodic components are filtered; or,
the gas leakage is judged according to the trend component.
Preferably, the intelligent microprocessor automatically controls the state (action, non-action) monitoring and signal remote transmission process of the first electronic signal contact 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.
Preferably, the intelligent microprocessor automatically controls the whole 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 and the like, an industrial control mainboard, an embedded main control board and the like, and comprises all peripherals, logics, input and output.
More preferably, the core element of the intelligent microprocessor is a processor composed of integrated circuits, or a programmable controller, or an industrial personal computer, or an industrial computer, or a single chip microcomputer, or an ARM chip, or an AI chip, or a quantum chip, or a photonic chip.
Preferably, the intelligent microprocessor is provided with an electrical interface, and the electrical interface is used for storing test data, and/or exporting the test data, and/or printing the test data, and/or carrying out data communication with an upper computer, and/or inputting analog quantity and digital quantity information.
More preferably, the gas density monitor supports basic information input of the monitor, the basic information including, but not limited to, one or more of factory number, accuracy requirement, rating parameter, manufacturing plant, operating location.
More preferably, the electrical interface is provided with an electrical interface protection circuit for preventing the interface from being damaged by the misconnection of a user and/or preventing electromagnetic interference.
Preferably, the intelligent microprocessor further comprises a communication module for transmitting the test data and/or the state monitoring result remotely.
More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.
Further, the wired communication mode comprises one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, an optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a P L C power carrier and a cable.
Further, the wireless communication mode comprises one or more of a 5G/NB-IOT communication module (such as 5G, NB-IOT), a 2G/3G/4G/5G, WIFI, Bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication and sonar which are arranged in the sensor.
Preferably, the control of the intelligent microprocessor is controlled by field control and/or the background monitoring terminal.
Preferably, the monitor is able to input a gassing event, and/or a gassing test event, and to compare the gas density value P according to the corresponding gassing event, and/or gassing test event20A new calculation or adjustment is made.
More preferably, the monitor monitors the gas density value P for a certain short time20Gradually increasing, judging as gas supplementing event, and when gas density value P20When the maximum value is reached, judging that the gas supplementing event is ended, and comparing the gas density value P20A new calculation or adjustment is made.
More preferably, the monitor monitors the gas density value P for a certain short time20Gradually decreases, and is judged as a gas release test (micro-water or decomposition) event, when the gas density value P is20When the value is the minimum value, judging that the air discharge test event is ended, and comparing the gas density value P20A new calculation or adjustment is made.
More preferably, the monitor records an air-filling event, and/or an air-bleeding test event. Such as recording the time of gas supply, and/or the number of times of gas supply, and/or the gas quality.
Preferably, the monitor further comprises a micro-water sensor for monitoring the micro-water value of the gas; and/or the monitor further comprises a decomposition sensor for on-line monitoring of the gaseous decomposition.
Preferably, the monitor further comprises a digital device or a liquid crystal device with a display.
Preferably, the monitor further comprises a mechanical part, the mechanical part comprising: the device comprises a pressure detector, a temperature compensation element, at least one signal generator and a signal adjusting mechanism.
More preferably, the first electrical signal contact is connected in parallel or in series to a signal generator of the mechanical part.
More preferably, the mechanical part further comprises a movement, a pointer and a dial.
More preferably, at least one temperature sensor is arranged near or on or integrated in a temperature compensation element of the mechanical part. Preferably, at least one of the temperature sensors is disposed at an end of the pressure detector of the mechanical part near the temperature compensation element.
Preferably, the monitor has a self-diagnosis function capable of timely notifying an abnormality. Such as a wire break, short alarm, sensor damage, etc.
Preferably, the monitor further comprises an analysis system (for example, an expert management analysis system) for detecting, analyzing and judging the gas density value monitoring, the gas density relay performance and the monitoring element.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
the monitor comprises a pressure sensor, a temperature sensor, an intelligent microprocessor, a first electronic signal contact and an equipment connecting joint, wherein the intelligent microprocessor processes the acquired pressure value and temperature value to obtain a corresponding gas density value, so that the gas density value of the electrical equipment is monitored; the two ends of the first electronic signal contact are respectively provided with a connecting point for being connected in parallel or in series to the contact of a gas density relay of the monitoring electrical equipment, so that the accurate information of gas leakage is timely informed to operation and maintenance personnel, the electronic accurate online monitoring and fault diagnosis can be carried out on the gas-insulated electrical equipment, the gas-insulated electrical equipment can be timely found and timely processed when gas leakage occurs, the safe operation of a power grid is guaranteed, and the SF leaked into the atmosphere is reduced6Gas, convenient site construction and installation and low investment cost.
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 diagram of a gas density monitor with a contact signal output according to a first embodiment;
FIG. 2 is a schematic block diagram of a gas density monitor with a junction signal output according to a first embodiment;
FIG. 3 is a schematic side view of a gas density monitor with a contact signal output according to a second embodiment;
FIG. 4 is a schematic diagram of the front structure of a gas density monitor with a contact signal output according to the second embodiment;
FIG. 5 is a schematic diagram of a gas density monitoring system with a junction signal output according to a third embodiment;
fig. 6 is a schematic structural diagram of a gas density monitoring system having a junction signal output according to a fourth embodiment.
Detailed Description
The utility model provides a gas density monitor and system with contact signal output, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following reference drawing does and the example of referring to the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order, it being understood that the data so used may be interchanged under appropriate circumstances. Furthermore, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The first embodiment is as follows:
fig. 1 is a schematic structural diagram of a gas density monitor having a contact signal output for a high and medium voltage electrical apparatus according to a first embodiment of the present invention. As shown in fig. 1, a gas density monitor with contact signal output includes a pressure sensor 201, a temperature sensor 3, a smart microprocessor 202, a device connection 1010, a power module 203, insulators 204, 205, 206, a pressure sensor mount 209, shields 208, 2011, a transmitter housing 2010, a signal wire mount 2012, and first and second electrical signal contacts 2013, 2014. The gas density monitor connects the first electronic signal contact 2013 and/or the second electronic signal contact 2014 to the contact of the gas density relay in parallel or in series according to actual needs; or the first electronic signal contact 2013 and/or the second electronic signal contact 2014 are connected in parallel or in series to the control circuit corresponding to the contact of the gas density relay.
The pressure sensor 201 is fixed on a pressure sensor fixing seat 209 in a sealing mode through insulating pieces 204, 205 and 206, the shielding piece 208 is arranged outside a sensor shell 207 and used for improving the anti-jamming capability of the gas density monitor, meanwhile, the shielding piece 2011 is arranged on the inner side (or the outer side) of a shell 2010 of the gas density monitor and further improves the anti-jamming capability of the gas density monitor, the first electronic signal contact 2013 and the second electronic signal contact 2014 can be achieved through components such as an electromagnetic relay, a solid state relay, a time relay, a power relay, a silicon controlled rectifier, an electronic switch, an electric contact, an optical coupler, a DI (digital interface), an MOS (metal oxide semiconductor) field effect transistor, a triode, a diode and an MOS (metal oxide semiconductor) FET (field effect transistor) relay, and the intelligent microprocessor 202 automatically controls the whole 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.
As shown in fig. 2, the intelligent microprocessor 202 is connected to a pressure sensor 201 and a temperature sensor 3, respectively. Pressure P signal and temperature T signal are collected by the pressure sensor 201 and the temperature sensor 3, and corresponding gas density value P is obtained by processing the signals by the intelligent microprocessor 202 according to the gas pressure-temperature characteristic20(i.e.a pressure value P of 20 ℃ C.)20) Go forward and go forwardSo as to realize the monitoring of the gas density value P of the electrical equipment20(or density values, pressure values, temperature values, or pressure values, temperature values).
The gas density value P20Gas density values that can be monitored in real time; or the gas density value obtained by an average value method; or the gas density value obtained after the trend value correction.
Specifically, the intelligent microprocessor 202 calculates and processes the gas density value of the electrical equipment by using an average value method (mean value method) to obtain a gas density value P20Average value P of20 average. The average value method is as follows: setting collection frequency in a set time interval, and calculating the average value of all the collected density values (N) at different time points to obtain the gas density value P20Average value P of20 average. Thus, the measurement is more accurate, and the influence of temperature is overcome.
The trend change value △ P20Comprises the following steps: setting collection frequency in set time interval, calculating average value of density values (N) of different time points obtained by all the collections to obtain gas density value P20Average value P of20 averageThen, a trend calculation period T is setPeriod of timeObtaining a trend change value △ P20＝P20 average (previous T period value)-P20 average (T period)I.e. the mean value P20 averageFront-back period TPeriod of timeA difference of (d); or at a set time interval TSpacerWhen the gas density value P of the monitored electrical equipment is20Trend change value △ P of20＝P20 (previous T interval)-P20(T interval)I.e. density value P20Front-to-back time interval TSpacerA difference of (d); or at a set time interval TSpacerA set time length TLength of. Using a set time interval TSpacerSetting the collection frequency, and collecting all the density values P of different time points20Performing cumulative calculation to obtain cumulative value ∑P20Obtaining a trend change value △ P20＝∑P20 (front)One length of T)-∑P20 (when T length)I.e. the time length T before and afterLength ofAccumulated value ∑P20The difference between them. Wherein N is an integer of 1 or more.
When the gas density value P of the monitored electrical equipment20Lower or higher than the set density value P20When the first electronic signal contact 2013 is set, the first electronic signal contact outputs an announcement contact signal A; or, at set time intervals, when the gas density value P of the monitored electrical equipment20Trend change value △ P of20Lower or higher than the set trend change value △ P20 setThen, the first electronic signal contact 2013 outputs an announcement contact signal a; or, at set time intervals, when the gas density value P of the monitored electrical equipment20Average value P of20 averageLower or higher than the set density average value P20 average settingThe first electrical signal contact 2013 outputs the notification contact signal a.
When the gas pressure value or the temperature value of the monitored electrical equipment is lower than or higher than the set pressure value Pset or temperature value T set, the second electronic signal contact 2014 outputs an announcement contact signal B; alternatively, when the temperature value reaches the set temperature threshold value tthreshold, and the gas pressure value of the monitored electrical device is lower or higher than the set pressure value pdet, the second electronic signal contact 2014 outputs the notification contact signal B.
The monitor set to a density value P20 setThe density value can be set according to requirements or detected within a set time period in the past according to requirements. The set values can be modified and stored online.
The intelligent control unit 202 controls the gas density value P at certain intervals20Fourier transform is carried out, the frequency spectrum is converted, periodic components are filtered, or the components are decomposed into trend components, periodic components and random components according to time series, and gas leakage is judged according to the trend components.
In addition, the monitor can input an air supplement event, and/or an air release test event, and can be based on the pairGas density values P for corresponding gassing events and/or gassing test events20New calculations or adjustments. The monitor monitors the gas density value P in a certain short time20Gradually increasing to determine gas supply event, and monitoring gas density value P20When the gas density is maximum, judging that the gas supplementing event is ended, and carrying out gas density value P20New calculations or adjustments. The monitor monitors the gas density value P in a certain short time20Gradually decreasing slightly, a gassing test (micro water or decomposition) event can be identified, when the gas density value P is monitored20When the minimum value is reached, judging that the air discharge test event is ended, and carrying out gas density value P20New calculations or adjustments. The monitor can record the event of gas filling, and/or the event of a deflation test, such as the time of gas filling, and/or the number of gas fillings, and/or the gas quality.
In a preferred embodiment, the monitor further comprises a digital device or a liquid crystal device with a display.
Example two:
fig. 3 and 4 are schematic structural views of a gas density monitor having a contact signal output for a high and medium voltage electrical apparatus according to a second embodiment of the present invention. As shown in figures 3 and 4, the gas density monitor with the joint signal output comprises a mechanical part 1 and an electronic part 2 which is independent from the mechanical part, wherein the mechanical part 1 and the electronic part 2 are designed integrally. Wherein the mechanical part 1 comprises: a machine part housing 101, and a base 102, a pressure detector 103, a temperature compensation element 104, a movement 105, a pointer 106, a dial 1012, an end seat 108, a signal adjustment mechanism 107, a plurality of signal generators 109, a device connection joint 1010, and a temperature sensor 3, which are provided in the machine part housing. The electronic part 2 comprises an electronic part housing 2010, and an intelligent processor 202 and a power supply (power supply module) 203 which are arranged in the electronic part 2 housing. The pressure sensor 201 is fixed on the pressure sensor fixing seat 209, and the pressure sensor 201 is communicated with the pressure detector 103 on an air path. The mechanical part shell 101 and the electronic part shell 2010 are independent or separated from each other, and the intelligent processor 202 is connected with the temperature sensor 3, the pressure sensor 201 and the communication module 4 respectively. The pressure sensor 201 is hermetically fixed on the sensor housing 207 through the insulators 204, 205, 206, and then is installed and fixed on the pressure sensor fixing seat 209.
A shield 208 is provided inside the sensor housing 207 to improve the tamper resistance of the monitor. Meanwhile, a shield 2011 is arranged on the inner side (or the outer side) of the electronic part shell 2010, so that the interference resistance of the monitor is further improved. The shield 2011 may shield the electric field or the magnetic field by utilizing the reflection and/or absorption of the shield material to reduce EMI emissions. The effective addition of the shielding material can reduce or eliminate unnecessary gaps, inhibit electromagnetic coupling radiation and reduce electromagnetic leakage and interference, and a material with higher conductivity and magnetic conductivity can be used as an electromagnetic shielding material (such as iron), and the shielding performance is generally required to be 40-60 dB. In particular, the electronic part 2 is sealed in a housing with a shielding material. The good sealing can well overcome the interference problem caused by electromagnetic leakage due to the electric discontinuity of the gap.
One end of the pressure detector 103 and one end of the temperature compensating element 104 are fixed to the end base 108, the other end of the pressure detector 103 is hermetically connected to the base 102, the other end of the temperature compensating element 104 is connected to the movement 105 through a display link or the other end of the temperature compensating element 104 is directly connected to the movement 105, and the pointer 106 is attached to the movement 105 and provided in front of the dial 1012. The signal generator 109 can adopt a microswitch or a magnetic auxiliary electric contact, and the contact signal of the gas density relay is output through the signal generator 109. The pressure detector 103 may employ a bourdon tube or a bellows tube. The temperature compensation element 104 may be a compensation plate or a gas enclosed in the mechanical part housing 101. The mechanical part 1 of the monitor of the present invention 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 monitor of the present embodiment, the varying pressure and temperature are corrected based on the pressure detector 103 and by the temperature compensation element 104 to reflect the variation in the density of the (sulphur hexafluoride) gas. Under the pressure of the measured medium (sulfur hexafluoride) gas, 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 tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation 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 measured sulfur hexafluoride gas is indicated on the dial 1012. The signal generator 109 serves as an output alarm latch contact signal. The monitor can then display the (sulphur hexafluoride) gas density value. If the density value of sulfur hexafluoride gas is reduced, the pressure detector 103 generates corresponding reverse displacement, the reverse displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is transmitted to the pointer 106, the pointer 106 moves towards the direction with small indicating value, the gas leakage degree is specifically displayed on the dial 1012, the signal generator 109 outputs (alarm locking) contact signals, and the density of sulfur hexafluoride gas in equipment such as an electrical switch and the like is monitored and controlled through a mechanical principle, so that the electrical equipment can work safely.
In the present embodiment, the temperature sensor 3 and the temperature compensation element 104 are provided together; or the temperature sensor 3 is arranged directly on the temperature compensation element 104; or the temperature sensor 3 is arranged in the vicinity of the temperature compensation element 104. Through the new design treatment, the performance is greatly improved.
In addition, the monitor further includes a heat insulator 5, the heat insulator 5 being disposed between the mechanical part housing 101 and the electronic part housing 2010; or the thermal insulation is provided at the power supply (power module) 203. The power supply (power supply module) 203 is located away from the temperature sensor 3 and the temperature compensation element 104.
The smart microprocessor 202 of the gas density monitor has electrical interfaces: test data storage can be completed; 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 electrical interface of the gas density monitor has a protection function, and the interface cannot be damaged due to misconnection; or/and will not be disturbed by electromagnetic fields. The intelligent microprocessor 202 further comprises a communication module, and the remote transmission of information such as test data and/or state monitoring results is realized through the communication module. The communication mode of the communication module can be a wired mode or a wireless mode. The core element of the intelligent microprocessor 202 is a processor composed of integrated circuits, or a programmable controller, or an industrial personal computer, or an industrial computer, or a single chip microcomputer, or an ARM chip, or an AI chip, or a quantum chip, or a photonic chip. The gas density monitor also has a self-diagnostic function, and can inform abnormality in time. Such as a wire break, short alarm, sensor damage, etc. The gas density monitor also includes an analysis system (expert management analysis system) for detecting and analyzing the gas density monitor, the performance of the gas density relay and the monitoring elements, and determining where the problem points are. Whether it is an electrical device or a gas density relay has a problem itself.
Example three:
fig. 5 is a schematic structural diagram of a gas density monitoring system with a contact signal output according to a third embodiment of the present invention. As shown in fig. 5, a plurality of high-voltage electrical devices provided with sulfur hexafluoride gas chambers and a plurality of gas density monitors are connected with the background monitoring terminal through the concentrator and the IEC61850 protocol converter in sequence. Wherein, each gas density monitor is respectively arranged on the high-voltage electrical equipment of the corresponding sulfur hexafluoride gas chamber.
In this embodiment, the background monitor terminal PC communicates with a plurality of HUB HUBs (HUB1, HUB2, … … HUB) via a HUB 0. Each HUB is connected with a group of gas density monitors, such as HUB1 connected with gas density monitors Z11, Z12, … … Z1n, HUB2 connected with gas density monitors Z21, Z22, … … Z2n and … …, and HUB hum connected with gas density monitors Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.
The background monitoring terminal comprises 1) a background software platform, namely, a background software key business module based on Windows, L inux and the like, or VxWorks, Android, Unix, UCos, FreeRTOS, RTX, embOS and MacOS.2), such as authority management, equipment management, data storage inquiry and the like, user management, alarm management, real-time data, historical data, real-time curves, historical curves, configuration management, data acquisition, data analysis, recording conditions, exception handling and the like, and 3) interface configurations such as a Form interface, a Web interface, a configuration interface and the like.
Example four:
fig. 6 is a schematic structural diagram of a gas density monitoring system with a contact signal output according to a fourth embodiment of the present invention. In this embodiment, a network switch Gateway, an integrated application Server, and a protocol converter/online monitoring intelligent unit ProC are added in comparison with the third embodiment. In this embodiment, the background monitor terminal PC connects two integrated application servers 1, Server2 through network switch Gateway, two integrated application servers 1, Server2 communicate with a plurality of protocol converters/online monitoring intelligent units ProC (ProC1, ProC2, … … ProCn) through station control layer a network and B network, and protocol converters/online monitoring intelligent units ProC communicate with a plurality of HUB (HUB1, HUB2, … … bm) through R5485 network. Each HUB is connected with a group of gas density monitors, such as HUB1 connected with gas density monitors Z11, Z12, … … Z1n, HUB2 connected with gas density monitors Z21, Z22, … … Z2n and … …, and HUB hum connected with gas density monitors Zm1, Zm2 and … … Zmn, wherein m and n are natural numbers.
To sum up, the utility model provides a gas density monitor that has contact signal output or the monitoring system who comprises it that high-voltage electrical equipment used can overcome mechanical type SF6SF of an electrical device which cannot be monitored well and accurately by a gas density relay6The gas density problem can be solved, and the problems of large investment and inconvenient site construction can be solved. The accurate information of gas leakage can be informed to operation and maintenance personnel in time, the safety performance is improved, the operation and maintenance cost is reduced, and the safe operation of a power grid is guaranteed. At the same time, SF can be greatly reduced6Gas is discharged, and the environment is protected.
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 (17)
1. A gas density monitor having a junction signal output, comprising: the intelligent temperature control system comprises a pressure sensor, a temperature sensor, an intelligent microprocessor, a first electronic signal contact and an equipment connecting joint for communicating electrical equipment;
the two ends of the first electronic signal contact are respectively provided with a connecting point which is used for being connected to the contact of a gas density relay of the monitoring electrical equipment in parallel or in series; or the two ends of the first electronic signal contact are respectively provided with a connecting point which is used for being connected in parallel or in series to a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment;
the intelligent microprocessor is respectively connected with the pressure sensor and the temperature sensor and is used for acquiring a pressure value acquired by the pressure sensor and a temperature value acquired by the temperature sensor and processing the pressure value and the temperature value to obtain a corresponding gas density value P20；
The intelligent microprocessor directly or indirectly controls the first electrical signal connection when the monitored gas density value P is reached20Lower or higher than the set density value P20 setThen, the first electronic signal contact outputs a first notification contact signal; or,
at set time intervals, when the monitored gas density value P20Trend change value △ P of20Lower or higher than the set trend density value △ P20 setThen, the first electronic signal contact outputs a first notification contact signal; or,
at set time intervals, when the monitored gas density value P20Average value P of20 averageLower or higher than the set density average value P20 average settingWhile, the first electronic signal contactOutputting a first notification contact signal;
wherein the first notification contact signal comprises an alarm, or/and a latch.
2. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the first electronic signal contact comprises at least one first normally-open switch, two ends of the first normally-open switch are respectively provided with a connecting point which is used for being connected in parallel with a contact of a gas density relay of the monitoring electrical equipment or a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-open density relay; or,
the first electronic signal contact comprises at least one first normally-closed switch, connecting points are respectively arranged at two ends of the first normally-closed switch and are used for being connected in series with the contact of the gas density relay of the monitoring electrical equipment or connected in series with a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-closed density relay.
3. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the monitor also comprises a second electronic signal contact, and two ends of the second electronic signal contact are respectively provided with a connecting point for being connected to a contact of a gas density relay of the monitoring electrical equipment in parallel or in series; or the two ends of the second electronic signal contact are respectively provided with a connecting point which is used for being connected in parallel or in series to a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment;
when the gas pressure value of the monitored electrical equipment is lower than or higher than the set pressure value PSetting upThen, the second electronic signal contact outputs a second notification contact signal; or,
when the gas temperature value of the monitored electrical equipment is lower than or higher than the set temperature value TSetting upThen, the second electronic signal contact outputs a second notification contact signal; or,
when the gas temperature value reaches the set temperature threshold value TSetting a threshold valueAnd the gas pressure value of the monitored electrical equipment is lower than or higher than the set pressure value PSetting upThen, the second electronic signal contact outputs a second notification contact signal;
wherein the second notification contact signal comprises an alarm, and/or a latch-up.
4. A gas density monitor having a junction signal output as claimed in claim 3, wherein: the second electronic signal contact comprises at least one second normally-open switch, two ends of the second normally-open switch are respectively provided with a connecting point which is used for being connected in parallel with a contact of a gas density relay of the monitoring electrical equipment or a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-open density relay; or,
the second electronic signal contact comprises at least one second normally-closed switch, two ends of the second normally-closed switch are respectively provided with a connecting point for being connected in series with a contact of a gas density relay of the monitoring electrical equipment or a control loop corresponding to the contact of the gas density relay of the monitoring electrical equipment, and the contact is a normally-closed density relay.
5. A gas density monitor having a junction signal output as claimed in claim 3, wherein: the first electronic signal contact or the second electronic signal contact comprises one or more of an electromagnetic relay, a solid state relay, a time relay, a power relay, a silicon controlled rectifier, an electronic switch, an electric contact, an optical coupler, DI, an MOS field effect transistor, a triode, a diode and an MOSFET relay.
6. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the pressure sensor and the temperature sensor are of an integrated structure.
7. The gas density monitor with junction signal output of claim 1, wherein said trend variation value is △ P20Comprises the following steps: setting collection frequency in a set time interval, and calculating the average value of N gas density values of different time points obtained by all the collections to obtain the gas density value P20Average value P of20 averageThen, a trend calculation period T is setPeriod of timeObtaining a trend change value △ P20＝P20 average (previous T period value)-P20 average (T period)I.e. the mean value P20 averageFront-back period TPeriod of timeA difference of (d); or,
at a set time interval TSpacerValue P of gas density monitored20Trend change value △ P of20＝P20 (previous T interval)-P20(T interval)I.e. density value P20Front-to-back time interval TSpacerA difference of (d); or,
setting a time interval TSpacerSetting the time length TLength ofAt a set time interval TSpacerSetting the collection frequency, and collecting all the N gas density values P obtained at different time points20Performing accumulation calculation to obtain an accumulated value ∑P20Obtaining a trend change value △ P20＝∑P20 (previous T length)-∑P20 (when T length)I.e. the time length T before and afterLength ofAccumulated value ∑P20The difference between them;
wherein N is a positive integer greater than or equal to 1.
8. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the set density value P20 setThe density value is set according to the requirement, or the density value is detected in a set time period in the past.
9. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the intelligent microprocessor 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.
10. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the intelligent microprocessor also comprises a communication module for realizing remote transmission of test data and/or state monitoring results.
11. A gas density monitor having a junction signal output as claimed in claim 10, wherein: the communication mode of the communication module is a wired communication mode or a wireless communication mode; wherein,
the wired communication mode comprises one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, an optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, P L C power carrier and a cable;
the wireless communication mode comprises one or more of a 5G/NB-IOT communication module arranged in the sensor, a 2G/3G/4G/5G, WIFI, Bluetooth, L ora, L orawan, Zigbee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication and sonar.
12. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the control of the intelligent microprocessor is controlled by field control and/or background monitoring terminals.
13. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the monitor is capable of inputting a gassing event and/or a gassing test event and of registering a gas density value P in dependence on the corresponding gassing event and/or gassing test event20A new calculation or adjustment is made.
14. A gas density monitor having a junction signal output as claimed in claim 13, wherein: the monitor monitors the gas density value P in a certain short time20Gradually increasing, judging as gas supplementing event, and when gas density value P20When the maximum value is reached, judging that the gas supplementing event is ended, and comparing the gas density value P20Performing a new calculation or adjustment; or,
the monitor monitors the gas density value P in a certain short time20Gradually decreases, and is judged as a deflation test event, when the gas density value P is20When the value is the minimum value, judging that the air discharge test event is ended, and comparing the gas density value P20A new calculation or adjustment is made.
15. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the monitor also comprises a micro-water sensor for monitoring the micro-water value of the gas; and/or the presence of a gas in the gas,
the monitor also includes a decomposition sensor for on-line monitoring of gaseous decomposition products.
16. A gas density monitor having a junction signal output as claimed in claim 1, wherein: the monitor also includes a digital device or a liquid crystal device with a display.
17. A gas density monitoring system having a junction signal output, characterized by: the system is comprised of a gas density monitor with a junction signal output as claimed in any one of claims 1 to 16; alternatively, the system includes a gas density monitor with a junction signal output as claimed in any one of claims 1 to 16.
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| CN110411893A (en) * | 2019-09-04 | 2019-11-05 | 上海乐研电气有限公司 | A kind of gas density monitor and system with contact point signal output |
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| CN110411893A (en) * | 2019-09-04 | 2019-11-05 | 上海乐研电气有限公司 | A kind of gas density monitor and system with contact point signal output |
| CN110411893B (en) * | 2019-09-04 | 2024-07-23 | 上海乐研电气有限公司 | Gas density monitor with contact signal output and system |
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