CN113835024A - Gas density relay calibration device and method - Google Patents
Gas density relay calibration device and method Download PDFInfo
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- CN113835024A CN113835024A CN202111014975.6A CN202111014975A CN113835024A CN 113835024 A CN113835024 A CN 113835024A CN 202111014975 A CN202111014975 A CN 202111014975A CN 113835024 A CN113835024 A CN 113835024A
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Abstract
The invention discloses a gas density relay calibration device which comprises a gas density relay body, a multi-way joint, a pressure sensor, a temperature sensor, a pressure adjusting mechanism, a control valve, a contact signal sampling unit, an intelligent control unit, an air supplementing interface and a rain cover, wherein the multi-way joint is arranged on the gas density relay body; the gas density relay body is connected with the contact signal sampling unit, the contact signal sampling unit is connected with the input end of the intelligent control unit, and the input end of the intelligent control unit is also connected with the output end of the pressure sensor and the output end of the temperature sensor respectively; the output end of the intelligent control unit is respectively connected with the control valve and the pressure regulating mechanism; and when the comparison result of the preset standard contact signal value and the contact action value of the gas density relay detected by the intelligent control unit is smaller than the preset contact signal threshold value, judging that the gas density relay is in a normal working state. The embodiment of the invention can monitor the gas density of the gas-insulated or arc-extinguishing electrical equipment and complete the online verification of the gas density relay.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a gas density relay calibration device and method.
Background
The switching device is an electrical device that has been widely used in an electrical power system, and the reliable operation thereof also becomes one of the important guarantees for the stable power supply of the electrical power system. The gas density relay is an important device which is arranged on the switch and used for monitoring the change of gas density, and the insulating property of the switch is ensured. If the gas density is reduced to a corresponding threshold value, an alarm or a lock is generated to prevent a malignant explosion accident from being generated in the switch operation process, and the quality of the gas density relay is directly related to whether the switch can normally operate. Therefore, in the power industry, the SF is regularly matched6And checking the gas density relay.
The regular verification of the SF6 gas density relay is one of necessary means for ensuring the safe and reliable operation of the power equipment. However, the whole process of on-site verification needs a large amount of manual work, the verification time of each detachable gas density relay is 30-50 minutes averagely, the verification time of each non-detachable gas density relay needs at least 10-30 minutes, and more than one hour, the verification data needs to be recorded manually, and the data is input into a computer after being copied to form a report file, so that the workload is large, and the efficiency is low. In addition, if the field verification of the detection personnel has irregular operation, certain potential safety hazard can be caused.
Disclosure of Invention
The embodiment of the invention aims to provide a gas density relay calibration device and a gas density relay calibration method, which can monitor the gas density of gas-insulated or arc-extinguishing electrical equipment, simultaneously complete the on-line calibration of the gas density relay, ensure the safe operation of a power grid, and further improve the calibration efficiency without requiring detection personnel to complete the calibration work of the gas density relay on site.
In order to achieve the above object, an embodiment of the present invention provides a gas density relay calibration apparatus, including: the intelligent air-conditioning relay comprises a gas density relay body, a multi-way joint, a pressure sensor, a temperature sensor, a pressure adjusting mechanism, a control valve connected with electrical equipment, a contact signal sampling unit, an intelligent control unit, an air supplementing interface and a rainproof cover;
the gas density relay body, the control valve, the pressure sensor, the air supply interface and the pressure adjusting mechanism are respectively arranged on the multi-way joint; the contact signal sampling unit and the intelligent control unit are fixed on the multi-way connector; the rain cover is fixed on the multi-way joint or the gas density relay body; the temperature sensor is close to the temperature compensation element of the gas density relay body or the temperature sensor is arranged in a sealed compensation air chamber of the gas density relay body; the control valve, the pressure sensor, the air supply interface and the pressure adjusting mechanism are respectively communicated with the gas density relay body through the multi-way connector;
the first contact of the gas density relay body is connected with the contact signal sampling unit, the output end of the contact signal sampling unit is connected with the input end of the intelligent control unit, and the input end of the intelligent control unit is also connected with the output end of the pressure sensor and the output end of the temperature sensor respectively;
the output end of the intelligent control unit is respectively connected with the control valve and the pressure regulating mechanism;
and when the comparison result of the preset standard contact signal value and the contact action value of the gas density relay detected by the intelligent control unit is smaller than the preset contact signal threshold value, the gas density relay is judged to be in a normal working state.
As an improvement of the above aspect, the contact signal sampling unit includes: the circuit comprises an electromagnetic relay, a diode, an optical coupler, a first resistor and a second resistor, wherein the electromagnetic relay is provided with two normally closed contacts;
two normally closed contacts of the electromagnetic relay are connected in series in a control loop of the first contact, one end of the first contact is connected with the cathode of a diode, and the anode of the diode is connected with a power supply;
the other end of the first contact is connected with the anode of the light-emitting diode, the cathode of the light-emitting diode is connected with one end of a second resistor, and the other end of the second resistor is grounded;
the collecting electrode of phototriode is regarded as the output of contact signal sampling unit is connected the intelligence accuse unit, phototriode's collecting electrode still passes through first resistance is connected with the power, phototriode's projecting pole ground connection.
As an improvement of the above scheme, the pressure adjusting mechanism comprises a closed air chamber, a heating element, a heat preservation piece and a temperature controller;
the heating element is arranged outside the closed air chamber or inside the closed air chamber;
the heat preservation piece is arranged outside the closed air chamber;
the temperature controller is arranged outside the closed air chamber.
As an improvement of the above, the gas density relay body includes: the device comprises a diaphragm capsule, a sealing compensation air chamber, at least one signal generator, a signal adjusting mechanism, a diaphragm capsule protecting piece, a support, a guide piece and a joint;
one end of the joint is communicated with the electrical equipment on a gas path through the multi-way joint, the other end of the joint is connected with the diaphragm capsule, and the diaphragm capsule and the sealed compensation gas chamber are correspondingly arranged together;
at least one of said signal generator, said signal conditioning mechanism, said capsule guard, said bracket and said guide are disposed within said seal compensation plenum, respectively;
the bracket is fixed inside the seal compensation air chamber, the bellows protector is fixed on the bracket and is arranged above the bellows; the bracket is also provided with at least one signal generator; the guide piece is fixed on the signal adjusting mechanism, and the signal adjusting mechanism is fixed on the diaphragm capsule.
As an improvement of the above aspect, the gas density relay body further includes: a magnet and a fixing member;
the magnet and the fixing piece are respectively arranged in the sealed compensation air chamber;
the signal generator comprises a signal operation arm, and the magnet is arranged above the signal operation arm through the fixing piece.
As an improvement of the scheme, one end of an action rod of the signal adjusting mechanism is fixed on the diaphragm capsule, the other end of the action rod is fixed with an adjusting disc, and an adjusting screw is arranged on the adjusting disc.
As the improvement of above-mentioned scheme, the intelligence is controlled the unit and is still including setting up the outside status indicator lamp of casing of the unit is controlled to the intelligence, the status indicator lamp with the intelligence is controlled the unit and is linked to each other to show the operating condition of the unit is controlled to the intelligence.
As the improvement of above-mentioned scheme, gas density relay calibration equipment still includes magnet, the communication module of unit is controlled to the intelligence passes through magnet adsorbs the outside of rain-proof cover.
As an improvement of the above scheme, the intelligent control unit further comprises a logic controller;
and the logic controller is used for carrying out online verification on the gas density relay body by the gas density relay verification device when the detected gas density of the gas density relay is not lower than a preset gas density threshold value.
In order to achieve the above object, an embodiment of the present invention further provides a gas density relay calibration method, which is applicable to the above gas density relay calibration apparatus, and the gas density relay calibration method includes:
in a checking state, the intelligent control unit controls the heating element of the pressure adjusting mechanism to heat, and when the comparison result of the temperature of the pressure adjusting mechanism and the temperature of the gas density relay body reaches a preset temperature threshold value, the intelligent control unit controls the control valve to close;
after the control valve is closed, the intelligent control unit controls the heating element to stop heating, so that the gas density relay body generates an alarm and/or locks a contact point to act;
the contact signal sampling unit transmits a signal of the contact action to the intelligent control unit, the intelligent control unit acquires a current pressure value acquired by the pressure sensor and a current temperature value acquired by the temperature sensor, and converts the current pressure value into a first pressure value corresponding to a preset temperature according to gas characteristics;
and detecting a contact action value of the gas density relay according to the first pressure value.
Compared with the prior art, the gas density relay calibration device and method provided by the embodiment of the invention have the advantages that the intelligent control unit controls the control valve to be closed, so that the gas density relay is isolated from the gas insulated electrical equipment on a gas path; through the lift of pressure adjustment mechanism regulation pressure for gas density relay takes place the contact action, and the contact action passes through contact signal sampling unit and transmits the intelligence and controls the unit, and the density value when the intelligence is controlled the unit and is moved according to the contact detects out gas density relay's warning and/or shutting contact action value and/or return value, accomplishes gas density relay's check-up work, need not the maintainer to the check-up work that the scene just can accomplish gas density relay. Meanwhile, the intelligent control unit analyzes the current gas density conditions of the gas density relay and the electrical equipment based on the monitored data to obtain an analysis result; the intelligent control unit uploads an analysis result to the Internet terminal through the built-in communication module, so that the Internet terminal can safely manage the current gas density relay and the electrical equipment, and the checking efficiency is improved. The gas density relay also comprises a magnet, so that the anti-seismic performance of the gas density relay is greatly improved.
Drawings
Fig. 1 is a block diagram of a gas density relay calibration apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control circuit of a gas density relay calibration apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an address assignment principle for automatically assigning a communication address code of a gas density relay calibration apparatus according to an embodiment of the present invention;
fig. 4 is a block diagram of a gas density relay body according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for verifying a gas density relay according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a gas density relay calibration apparatus according to an embodiment of the present invention, including: the intelligent air-conditioning relay comprises a gas density relay body 1, a multi-way joint 2, a pressure sensor 3, a temperature sensor 4, a pressure adjusting mechanism 5, a control valve 6 connected with electrical equipment, a contact signal sampling unit 7, an intelligent control unit 8, an air supplementing interface 9 and a rain cover 10;
the gas density relay body 1, the control valve 6, the pressure sensor 3, the air supply interface 9 and the pressure adjusting mechanism 5 are respectively arranged on the multi-way joint 2; the contact signal sampling unit 7 and the intelligent control unit 8 are fixed on the multi-way connector 2; the rain cover 10 is fixed on the multi-way joint 2 or the gas density relay body 1; the temperature sensor 4 is close to the temperature compensation element of the gas density relay body or the temperature sensor 4 is arranged in the shell of the gas density relay body 1; the control valve 6, the pressure sensor 3, the air supply interface 9 and the pressure adjusting mechanism 5 are respectively communicated with the gas density relay body 1 through the multi-way connector 2;
the first contact of the gas density relay body 1 is connected with the contact signal sampling unit 7, the output end of the contact signal sampling unit is connected with the input end of the intelligent control unit 8, and the input end of the intelligent control unit 8 is also connected with the output end of the pressure sensor 3 and the output end of the temperature sensor 4 respectively;
the output end of the intelligent control unit 8 is respectively connected with the control valve 6 and the pressure regulating mechanism 5;
and when the comparison result of the preset standard contact signal value and the contact action value of the gas density relay detected by the intelligent control unit 8 is smaller than the preset contact signal threshold value, the gas density relay is judged to be in a normal working state.
The gas density relay calibration device can also detect the temperature compensation performance of the gas density relay, the contact point contact resistance of the gas density relay, and the contact point signal state of the gas density relay.
In the embodiment of the invention, the intelligent control unit controls the control valve to be closed, so that the gas density relay is isolated from the gas insulated electrical equipment on a gas path; through the lift of pressure adjustment mechanism regulation pressure for gas density relay takes place the contact action, and the contact action passes through contact signal sampling unit and transmits the intelligence and controls the unit, and the density value when the intelligence is controlled the unit and is moved according to the contact detects out gas density relay's warning and/or shutting contact action value and/or return value, accomplishes gas density relay's check-up work, need not the maintainer to the check-up work that the scene just can accomplish gas density relay.
In a preferred embodiment, the pressure adjusting mechanism 5 comprises a closed air chamber 501, a heating element 502, a thermal insulation member 503, and a temperature controller 504;
the heating element is arranged outside the closed air chamber or inside the closed air chamber;
the heat preservation piece is arranged outside the closed air chamber;
the temperature controller is arranged outside the closed air chamber.
In the embodiment of the present invention, the heating element 502 is heated to change the temperature of the gas in the closed gas chamber 501, thereby completing the rise and fall of the gas pressure; when the gas density relay needs to be verified, the gas density relay verifying device sends an instruction to heat the heating element 502 of the pressure adjusting mechanism 5, and when the temperature value T of the temperature controller 504 of the pressure adjusting mechanism 5 is detected504After the temperature difference between the gas density relay and the temperature value T of the temperature sensor 4 reaches a preset temperature threshold value, the gas density relay calibration device sends an instruction, namely the intelligent control unit 8 controls the control valve 6 to be closed, so that the gas density relay body 1 is isolated from the electrical equipment 12 on a gas path; then immediately turning off the heating element 502 of the pressure regulating mechanism 5, stopping heating the heating element 502, gradually reducing the pressure of the gas in the closed gas chamber 501 of the pressure regulating mechanism 5, so that the gas density relay body 1 generates an alarm and/or locking contact action, the contact action is transmitted to the intelligent control unit 8 through the contact signal sampling unit 7, and the intelligent control unit 8 detects the contact (alarm or locking contact) action value P of the gas density relay according to the density value when the alarm and/or locking contact is in actionJ20And/or return value PF20And completing the online verification of the gas density relay.
Specifically, the contact signal sampling unit 7 and the intelligent control unit 8 are provided together.
In a preferred embodiment, as shown in fig. 2, the junction signal sampling unit 7 includes: the circuit comprises an electromagnetic relay J1 provided with two normally-closed contacts J11 and J12, a diode D1, an optical coupler OC1, a first resistor R1 and a second resistor R2, wherein the optical coupler OC1 comprises a light-emitting diode and a phototriode;
two normally closed contacts J11 and J12 of the electromagnetic relay are connected in series in a control circuit of the first contact PJ, one end of the first contact PJ is connected with the cathode of a diode D1, and the anode of the diode D1 is connected with a power supply;
the other end of the first contact PJ is connected with the anode of a light-emitting diode, the cathode of the light-emitting diode is connected with one end of R2 of a second resistor, and the other end of the second resistor R2 is grounded;
the collecting electrode of the phototriode is regarded as the output out7 of the contact signal sampling unit 7 is connected the intelligent control unit 8, the collecting electrode of the phototriode is also connected with the power supply through the first resistor R1, and the emitting electrode of the phototriode is grounded.
Specifically, the contact signal sampling unit applies a voltage not lower than 24V to a test voltage of a contact action value or a switching value of the contact action value of the gas density relay, namely, during verification, a voltage not lower than 24V is applied between corresponding terminals of the contact signal.
It should be noted that the contact point sampling circuit described above can easily determine whether the contact point PJ of the gas density relay is open or closed. Specifically, when the first contact PJ is closed, the closed loop is powered on, the light emitting diode of the optical coupler OC1 emits light, the light turns on the phototriode of the optical coupler OC1, and the collector of the phototriode outputs a low level; when the first contact PJ is opened, the closed loop is opened, the light emitting diode does not emit light, the phototriode is cut off, and the collector of the phototriode outputs high level. In this way, the state of the first contact PJ of the gas density relay body 1 can be known by the output terminal out7 of the contact signal sampling unit 7 outputting a high/low level. This embodiment makes intelligent control unit 8 and contact signal control circuit keep apart through the method of optoelectronic isolation, closes first contact PJ in the verification process, and perhaps contact PJ also can take place to close under the condition of taking place to leak gas, at this moment, all detects the low level of phototriode's collecting electrode output. Therefore, the closing of the first contact PJ is controlled for a preset duration to ensure that the first contact is closed during the verification process, not in the event of a gas leak. In the verification process, the duration of the closed state of the first contact point PJ is determined, and whether the first contact point PJ is closed in the verification process can be judged by monitoring the duration of the received low level. Therefore, the alarm signal during the verification, rather than the alarm signal during the air leakage, sent by the gas density relay body 1 can be judged by recording the time during the verification, and the contact signal state of the gas density relay can be monitored.
In the embodiment of the invention, the contact signal sampling unit is relatively isolated from the contact signal of the gas density relay on the circuit in a non-verification state. In a checking state, a contact signal control loop of the gas density relay can be cut off, so that a contact action signal of the gas density relay is not uploaded during checking, and the safe operation of a power grid is not influenced; according to the embodiment of the invention, the contact signal sampling unit can be used for verifying without influencing the safe operation of the electrical equipment, the performance of the intelligent control unit and the damage of the device or the influence on the test work.
In a preferred embodiment, the intelligent control unit 8 further comprises a logic controller 804;
and the logic controller 804 is configured to perform online verification on the gas density relay body by the gas density relay verification device when the detected gas density of the gas density relay is not lower than a preset gas density threshold.
Preferably, when the detected gas density value of the gas density relay is greater than or equal to (the alarm pressure value is plus 0.02MPa), the gas density relay checking device carries out online checking on the gas density relay body.
In the embodiment of the invention, the logic controller 804 has a self-locking function, so that the on-line verification can be effectively ensured not to be operated when the gas density is lower than a preset gas density threshold.
In a further preferred embodiment, the gas density relay calibration apparatus further includes a magnet, and the communication module of the intelligent control unit 8 is adsorbed outside the rain-proof cover 10 through the magnet 11.
Specifically, the communication module 802 uploads the monitored data or/and information to the internet backend terminal, so that the internet backend terminal can perform security management on the current gas density relay and the electrical device. The intelligent control unit can automatically distribute communication address codes of monitoring devices of the gas density relay calibration device, and the background terminal sends addressing broadcast to the monitoring devices of the gas density relay calibration devices; after receiving the addressing broadcast, a monitoring device of the gas density relay calibration device without the equipment address is used for judging whether the input level of the current own arrangement sequence identification signal is in a suspension state or a preset level state; if so, the monitoring device of the gas density relay calibration device identifies the address in the addressing broadcast as the self equipment address; and if not, the monitoring device of the gas density relay calibration device waits for the background to send the addressing broadcast of the next address.
As shown in fig. 3, the rank identification signal may be generated by the internet backend terminal, or may be generated by the monitoring device itself, where TX represents the upload data, and RX represents the receive data. Based on the fact that the input level is in a suspended state, addresses (equipment addresses) are distributed to the monitoring devices which are ranked first, before the internet background terminal initiates a monitoring device address addressing process, namely before the internet background terminal sends first frame addressing broadcast to the monitoring devices, the monitoring devices respectively generate arrangement sequence identification signals, and the input level of the arrangement sequence identification signals of the monitoring devices is set to be in the suspended state. After receiving a first frame addressing broadcast sent by an internet background terminal, each monitoring device changes the output level of the own arrangement sequence identification signal into low level or high level before identifying the address (equipment address) of the monitoring device, so that the input levels of other monitoring devices ordered by the first ordered monitoring device correspondingly change into low level or high level. When the monitoring device of the first bit is in a suspended state based on the input level of the self arrangement sequence identification signal, the address in the first frame addressing broadcast is identified as the address of the monitoring device of the first bit, the output level of the self arrangement sequence identification signal is correspondingly changed from low level or high level to high level or low level, so that the input level of the monitoring device of the second bit is correspondingly changed into high level or low level, and the input levels of other monitoring devices after the second bit are still kept at low level or high level. Therefore, the gas density relay checking device can judge and inform the detection result, and the mode is flexible and universal. Specifically, 1) the gas density relay verification device may be annunciated locally, such as by status indicator lights, digital or liquid crystal displays, etc.; 2) or the gas density relay checking device can upload the data to a specific terminal through wireless uploading;
it can be understood that the monitoring devices in the above embodiments refer to various monitoring devices in the gas density relay calibration device, including a pressure sensor and a temperature sensor;
in the embodiment of the invention, the communication module 802 is adsorbed outside the rain cover 10 through the magnet 11, so that the installation is convenient, and the communication effect is improved.
In a further preferred embodiment, the intelligent control unit 8 further comprises a status indicator light 803 disposed outside the housing of the intelligent control unit 8, and the status indicator light is connected to the intelligent control unit 8 to display the working status of the intelligent control unit 8.
Specifically, the intelligent control unit 8 mainly comprises a processor 801, a communication module 802, a status indicator light 803, and a logic controller 804. The processor 801 may be: general purpose computer, industrial personal computer, CPU, singlechip, ARM chip, AI chip, MCU, FPGA, PLC etc., industrial control mainboard, embedded main control board etc. and other intelligent integrated circuit.
The pressure sensor 3 for pressure acquisition may be: various pressure-sensitive elements such as a pressure sensor and a pressure transmitter;
the temperature sensor 4 for temperature acquisition may be: various temperature sensing elements such as temperature sensors and temperature transmitters.
The control valve 6 may be: electromagnetic control valve, electric control valve.
In the embodiment of the invention, the intelligent control unit 8 monitors the gas pressure and the temperature of the electrical equipment 12 according to the pressure sensor 3 and the temperature sensor 4 to obtain the corresponding 20 ℃ pressure value P1(i.e., gas density value). In conjunction with its logic controller 804, the gas density value P in the case of a permissible verification1Not less than a preset gas density threshold value PSThe heating element 502 of the pressure regulating mechanism 5 is heated by the intelligent control unit 8 when the temperature value T of the temperature controller 504 of the pressure regulating mechanism 5 is measured504After the temperature difference with the temperature value T of the temperature sensor 4 reaches a preset temperature threshold value, the intelligent control unit 8 controls the control valve 6 to be closed, so that the gas density relay body 1 is isolated from the electrical equipment 12 on a gas path; next, the intelligent control unit 8 disconnects the control circuit of the gas density relay body 1, that is, the contacts J11 and J12 of the electromagnetic relay J1 of the contact signal sampling unit 7 are disconnected, so that the safe operation of the electrical equipment 12 is not affected when the gas density relay body 1 is checked online, and an alarm signal is not mistakenly sent or the control circuit is locked when the gas density relay body is checked. Because the gas density relay checking device already carries out the gas density value P before the checking is started1Not less than a preset gas density threshold value PSThus, the gas of the electrical equipment is in a safe operating range, and the gas leakage is a slow process and safe in verification. Then immediately turning off the heating element 502 of the pressure regulating mechanism 5, stopping heating the heating element 502, gradually reducing the pressure of the gas in the sealed gas chamber 501 of the pressure regulating mechanism 5, so that the density relay 1 alarms and/or locks the contact action, at this time, the output end out7 of the contact signal sampling unit 7 outputs low level, that is, when the intelligent control unit 8 detects that the output end out7 of the contact signal sampling unit 7 is low level, the intelligent control unit 8 immediately obtains the current pressure value P and the current temperature value T collected by the pressure sensor 3 and the temperature sensor 4, and converts the current pressure value P and the current temperature value T into a first pressure value corresponding to 20 ℃ according to the gas characteristics (gas pressure-temperature characteristics), that is, the gas density valueP20Detecting the contact (alarm or lock contact) action value P of the gas density relayJ20And completing the online verification of the action value of the gas density relay. Then, the heating element 502 of the pressure adjusting mechanism 5 is turned on, the heating element 502 is heated, the pressure of the gas in the sealed gas chamber 501 of the pressure adjusting mechanism 5 is gradually increased, so that the gas density relay generates an alarm and/or the latching contact respectively returns, at this time, the output end out7 of the contact signal sampling unit 7 outputs a high level, that is, when the intelligent control unit 8 detects that the output end out7 of the contact signal sampling unit 7 is at a high level, the intelligent control unit 8 immediately obtains the current pressure value P and the current temperature value T collected by the pressure sensor 3 and the temperature sensor 4, and converts the current pressure value P and the current temperature value T into a second pressure value corresponding to 20 ℃ according to the gas characteristics (gas pressure-temperature characteristics), that is, the gas density value P20', detecting the contact (alarm or lock contact) return value P of the gas density relayF20And completing the online verification of the return value of the gas density relay. The gas density relay checking device can check repeatedly for a plurality of times (for example, 2 to 3 times) in this way, and then calculate the average value. After the corresponding requirements are completed, the calibration work of the gas density relay is completed. Then the gas density relay calibration device sends an instruction, and the intelligent control unit 8 controls the control valve 6 to be opened, so that the gas density relay body 1 is communicated with the electrical equipment 12 on a gas path; the heating element 502 of the pressure adjusting mechanism 5 is turned off, and the heating of the heating element 502 is stopped; then, an instruction is sent again, the intelligent control unit 8 is communicated with a control loop of the gas density relay body 1, namely, the contacts J11 and J12 of the electromagnetic relay J1 of the contact signal sampling unit 7 are closed, so that the density monitoring loop of the gas density relay body 1 works normally, the gas density of the electrical equipment 12 is monitored safely by the gas density relay body 1, and the electrical equipment 12 works safely and reliably. Therefore, the online checking work of the gas density relay is conveniently finished, and the safe operation of the electrical equipment 12 cannot be influenced when the gas density relay body 1 is checked online.
After the verification work of the gas density relay is finished, the intelligent control unit is presetStandard contact signal value P of gas density relayB20The intelligent control unit controls the action value P of the gas density relayJ20And the signal value P of the standard contactB20Comparing to obtain a difference | P between the contact signalsJ20-PB20L, |; if the difference value | P of the contact signalsJ20-PB20If the l is smaller than the preset contact signal threshold, the current working state of the monitoring part of the gas density relay is a normal working state, otherwise, the current working state is an abnormal working state. Simultaneously, intelligence accuse unit 8 acquires pressure value and temperature value that pressure sensor 3 and temperature sensor 4 gathered to according to the corresponding pressure value when gas pressure-temperature characteristic automatic conversion becomes 20 ℃, accomplish monitoring devices is to its monitoring electrical equipment's that monitors gas density's on-line monitoring. Namely, the intelligent control unit 8 is used for collecting the contact point action signal value P of the gas density relay at the time in timeJ20The detected contact signal value P of the gas density relay body 1J20Standard (rated parameter) required contact signal value P of gas density relayB20Comparing, when | PJ20-PB20When | is less than the preset contact signal threshold, the on-line monitoring density monitoring part of the gas density relay or the gas density monitoring device works normally without maintenance.
In a further preferred embodiment, the gas density relay calibration device further comprises a micro water sensor 13, which can monitor the gas micro water value on line;
in a further preferred embodiment, the gas density relay verification device further comprises a heater and/or a heat sink;
the embodiment of the invention has protection on the temperature of the electronic environment, prevents the electronic environment from working at too low temperature or too high temperature and enables the electronic environment to work in an allowable temperature range. A heater and/or a radiator (fan) can be arranged, the heater is started at low temperature, and the radiator (fan) is started at high temperature, so that the pressure sensor and/or the integrated circuit and other electronic elements can reliably work in low-temperature or high-temperature environments.
In another preferred embodiment, as shown in fig. 4, the gas density relay body 1 includes: bellows 1001, seal compensation gas chamber 1002, at least one signal generator 1003, signal adjustment mechanism 1004, bellows protector 1005, mount 1007, guide 1009, joint 1010;
one end of the connector 1010 is communicated with the electrical equipment on an air path through the multi-way connector 2, the other end of the connector 1010 is connected with the diaphragm capsule 1001, and the diaphragm capsule 1001 and the sealed compensation air chamber 1002 are correspondingly arranged together;
at least one of the signal generator 1003, the signal adjustment mechanism 1004, the bellows protector 1005, the holder 1007, and the guide 1009 are respectively disposed inside the seal compensation gas chamber 1002;
the bracket 1007 is fixed inside the seal compensation air chamber 1002, the bellows protector 1005 is fixed on the bracket 1007, and the bellows protector 1005 is arranged above the bellows 1001; the bracket 1007 is also provided with at least one signal generator 1003; the guide 1009 is fixed to the signal adjustment mechanism 1004, and the signal adjustment mechanism 1004 is fixed to the bellows 1001.
In the embodiment of the invention, the bracket 1007 is fixed inside the seal compensation air chamber 1002, the bellows protection piece 1005 is fixed on the bracket 1007, and the bellows protection piece 1005 is arranged above the bellows 1001, so that the bellows 1001 can be protected from working within the elastic range of the bellows 1001, and the bellows 1001 is prevented from being seriously deformed. The embodiment can improve the performance of the gas density electric appliance, so that the gas density relay on-line monitoring density monitoring part works normally without maintenance.
As a modification of the above, the gas density relay body 1 further includes: a magnet 1006 and a mount 1008;
the magnet 1006 and the fixing member 1008 are respectively arranged inside the sealed compensation air chamber 1002;
the signal generator 1003 includes a signal operating arm 10031, and the magnet 1006 is disposed above the signal operating arm 10031 through the fixing member 1008.
As an improvement of the above-mentioned solution, one end of the actuating rod 10041 of the signal adjusting mechanism 1004 is fixed to the diaphragm capsule 1001, the other end of the actuating rod 10041 is fixed with an adjusting disc 10043, and the adjusting disc 10043 is provided with an adjusting screw 10042.
In the embodiment of the present invention, the magnet 1006 can hold the signal operating arm 10031, so that when the switch is switched on and off, the signal operating arm 10031 is not easily displaced, and the signal generator 1003 does not generate a contact malfunction, thereby greatly improving the anti-seismic performance of the density relay. The gas density relay body 1 monitors the gas density through the diaphragm capsule 1001 and the seal compensation gas chamber 1002, and realizes the monitoring of the gas density by combining the signal generator 1003, and when the gas density is lower than the set gas density, the signal generator 1003 outputs an alarm or/and a locking contact signal through the adjustment of the signal adjusting mechanism 1004. The working principle is as follows: after the adjusting screw 10042 is adjusted, the sealed compensation air chamber 1002 is filled with compensation air with corresponding pressure according to the parameters of the gas density relay. The gas sealing the compensation gas chamber 1002 and the sealed cavity of the electrical equipment has high density and high pressure under the same environmental temperature. If SF6(sulfur hexafluoride) no air leakage occurs to the electrical equipment, and the gas density relay does not send out an alarm locking signal; if SF6When the electrical equipment leaks gas, SF6SF in electrical equipment6When the gas density is close to or lower than the density of the compensation gas in the sealed compensation gas chamber 1002, the signal adjusting mechanism 1004 moves downwards, the adjusting screw 10042 triggers the signal generator 1003, and the gas density relay body 1 sends out an alarm locking signal to ensure the safety of the power grid. The density relay adopts the diaphragm capsule 1001 as a pressure detection element, so that the density relay is large in size and good in shock resistance; in addition, gas density relay body 1 still includes magnet 1006, magnet 1006 sets up in signal operation arm 10031's top, and signal operation arm 10031 swings too big at will when preventing the electrical equipment operation, can improve density relay 1's anti-seismic performance greatly, makes gas density relay's performance obtain the guarantee, realizes non-maintaining.
Referring to fig. 5, fig. 5 is a gas density relay verification method provided in an embodiment of the present invention, which is suitable for the gas density relay verification apparatus described in the above embodiment, and the gas density relay verification method includes:
s11, in a verification state, the intelligent control unit controls the heating element of the pressure adjusting mechanism to heat, and when the comparison result of the temperature of the pressure adjusting mechanism and the temperature of the gas density relay body reaches a preset temperature threshold value, the intelligent control unit controls the control valve to close;
s12, after the control valve is closed, the intelligent control unit controls the heating element to stop heating so as to enable the gas density relay body to give an alarm and/or lock the contact point to act;
s13, the contact signal sampling unit transmits a contact action signal to the intelligent control unit, the intelligent control unit acquires a current pressure value acquired by the pressure sensor and a current temperature value acquired by the temperature sensor, and converts the current pressure value into a first pressure value corresponding to a preset temperature according to gas characteristics;
and S14, detecting the contact action value of the gas density relay according to the first pressure value.
Preferably, after detecting the contact action value of the gas density relay according to the first pressure value, the method further includes:
the intelligent control unit controls the heating element to heat so that the gas density relay gives an alarm and/or locks a contact point to return;
the contact signal sampling unit transmits a signal of the contact action to the intelligent control unit, the intelligent control unit acquires a current pressure value acquired by the pressure sensor and a current temperature value acquired by the temperature sensor, and converts the current pressure value into a second pressure value corresponding to a preset temperature according to gas characteristics;
and detecting a contact point return value of the gas density relay according to the second pressure value.
According to the gas density relay calibration device and method provided by the embodiment of the invention, the intelligent control unit controls the control valve to be closed, so that the gas density relay is isolated from the gas insulated electrical equipment on a gas path; through the lift of pressure adjustment mechanism regulation pressure for gas density relay takes place the contact action, and the contact action passes through contact signal sampling unit and transmits the intelligence and controls the unit, and the density value when the intelligence is controlled the unit and is moved according to the contact detects out gas density relay's warning and/or shutting contact action value and/or return value, accomplishes gas density relay's check-up work, need not the maintainer to the check-up work that the scene just can accomplish gas density relay. Meanwhile, the intelligent control unit analyzes the current gas density conditions of the gas density relay and the electrical equipment based on the monitored data to obtain an analysis result; the intelligent control unit uploads an analysis result to the Internet terminal through the built-in communication module, so that the Internet terminal can safely manage the current gas density relay and the electrical equipment, and the checking efficiency is improved. The gas density relay also comprises a magnet, so that the anti-seismic performance of the gas density relay is greatly improved.
It should be noted that, in the method for verifying a gas density relay according to the embodiment of the present invention, reference may be made to the working process of the device for verifying a gas density relay according to the above embodiment, which is not described herein again.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A gas density relay calibration device, comprising: the intelligent air-conditioning relay comprises a gas density relay body, a multi-way joint, a pressure sensor, a temperature sensor, a pressure adjusting mechanism, a control valve connected with electrical equipment, a contact signal sampling unit, an intelligent control unit, an air supplementing interface and a rainproof cover;
the gas density relay body, the control valve, the pressure sensor, the air supply interface and the pressure adjusting mechanism are respectively arranged on the multi-way joint; the contact signal sampling unit and the intelligent control unit are fixed on the multi-way connector; the rain cover is fixed on the multi-way joint or the gas density relay body; the temperature sensor is close to the temperature compensation element of the gas density relay body or the temperature sensor is arranged in a sealed compensation air chamber of the gas density relay body; the control valve, the pressure sensor, the air supply interface and the pressure adjusting mechanism are respectively communicated with the gas density relay body through the multi-way connector;
the first contact of the gas density relay body is connected with the contact signal sampling unit, the output end of the contact signal sampling unit is connected with the input end of the intelligent control unit, and the input end of the intelligent control unit is also connected with the output end of the pressure sensor and the output end of the temperature sensor respectively;
the output end of the intelligent control unit is respectively connected with the control valve and the pressure regulating mechanism;
and when the comparison result of the preset standard contact signal value and the contact action value of the gas density relay detected by the intelligent control unit is smaller than the preset contact signal threshold value, the gas density relay is judged to be in a normal working state.
2. The gas density relay calibration device of claim 1, wherein said contact signal sampling unit comprises: the circuit comprises an electromagnetic relay, a diode, an optical coupler, a first resistor and a second resistor, wherein the electromagnetic relay is provided with two normally closed contacts;
two normally closed contacts of the electromagnetic relay are connected in series in a control loop of the first contact, one end of the first contact is connected with the cathode of a diode, and the anode of the diode is connected with a power supply;
the other end of the first contact is connected with the anode of the light-emitting diode, the cathode of the light-emitting diode is connected with one end of a second resistor, and the other end of the second resistor is grounded;
the collecting electrode of phototriode is regarded as the output of contact signal sampling unit is connected the intelligence accuse unit, phototriode's collecting electrode still passes through first resistance is connected with the power, phototriode's projecting pole ground connection.
3. The gas density relay calibration device of claim 1, wherein said pressure adjustment mechanism comprises a closed gas chamber, a heating element, a thermal insulator, a temperature controller;
the heating element is arranged outside the closed air chamber or inside the closed air chamber;
the heat preservation piece is arranged outside the closed air chamber;
the temperature controller is arranged outside the closed air chamber.
4. The gas density relay calibration device of claim 1, wherein the gas density relay body comprises: the device comprises a diaphragm capsule, a sealing compensation air chamber, at least one signal generator, a signal adjusting mechanism, a diaphragm capsule protecting piece, a support, a guide piece and a joint;
one end of the joint is communicated with the electrical equipment on a gas path through the multi-way joint, the other end of the joint is connected with the diaphragm capsule, and the diaphragm capsule and the sealed compensation gas chamber are correspondingly arranged together;
at least one of said signal generator, said signal conditioning mechanism, said capsule guard, said bracket and said guide are disposed within said seal compensation plenum, respectively;
the bracket is fixed inside the seal compensation air chamber, the bellows protector is fixed on the bracket and is arranged above the bellows; the bracket is also provided with at least one signal generator; the guide piece is fixed on the signal adjusting mechanism, and the signal adjusting mechanism is fixed on the diaphragm capsule.
5. The gas density relay calibration device of claim 4, wherein the gas density relay body further comprises: a magnet and a fixing member;
the magnet and the fixing piece are respectively arranged in the sealed compensation air chamber;
the signal generator comprises a signal operation arm, and the magnet is arranged above the signal operation arm through the fixing piece.
6. The gas density relay calibration device according to claim 4, wherein one end of the actuating rod of said signal adjusting mechanism is fixed on said capsule, and the other end of said actuating rod is fixed with an adjusting disk, and said adjusting disk is provided with an adjusting screw.
7. The gas density relay calibration device of claim 1, wherein the intelligent control unit further comprises a status indicator lamp disposed outside a housing of the intelligent control unit, the status indicator lamp being connected to the intelligent control unit to display an operating status of the intelligent control unit.
8. The gas density relay calibration device of claim 1, wherein the gas density relay calibration device further comprises a magnet, and the communication module of the intelligent control unit is adsorbed outside the rain-proof cover through the magnet.
9. The gas density relay calibration device of claim 1, wherein said intelligent control unit further comprises a logic controller;
and the logic controller is used for carrying out online verification on the gas density relay body by the gas density relay verification device when the detected gas density of the gas density relay is not lower than a preset gas density threshold value.
10. A gas density relay verification method, which is applied to the gas density relay verification apparatus according to any one of claims 1 to 9, and which includes:
in a checking state, the intelligent control unit controls the heating element of the pressure adjusting mechanism to heat, and when the comparison result of the temperature of the pressure adjusting mechanism and the temperature of the gas density relay body reaches a preset temperature threshold value, the intelligent control unit controls the control valve to close;
after the control valve is closed, the intelligent control unit controls the heating element to stop heating, so that the gas density relay body generates an alarm and/or locks a contact point to act;
the contact signal sampling unit transmits a signal of the contact action to the intelligent control unit, the intelligent control unit acquires a current pressure value acquired by the pressure sensor and a current temperature value acquired by the temperature sensor, and converts the current pressure value into a first pressure value corresponding to a preset temperature according to gas characteristics;
and detecting a contact action value of the gas density relay according to the first pressure value.
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| CN202111014975.6A CN113835024A (en) | 2021-08-31 | 2021-08-31 | Gas density relay calibration device and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456266A (en) * | 2019-09-04 | 2019-11-15 | 上海乐研电气有限公司 | Electrical system and its method of calibration with on-line sampling verifying function |
| CN111128598A (en) * | 2020-01-08 | 2020-05-08 | 南方电网科学研究院有限责任公司 | Gas density monitoring device |
| CN211719511U (en) * | 2020-01-08 | 2020-10-20 | 南方电网科学研究院有限责任公司 | Gas density monitoring device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456266A (en) * | 2019-09-04 | 2019-11-15 | 上海乐研电气有限公司 | Electrical system and its method of calibration with on-line sampling verifying function |
| CN111128598A (en) * | 2020-01-08 | 2020-05-08 | 南方电网科学研究院有限责任公司 | Gas density monitoring device |
| CN211719511U (en) * | 2020-01-08 | 2020-10-20 | 南方电网科学研究院有限责任公司 | Gas density monitoring device |
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