CN116047280A - Intelligent gas density relay device - Google Patents

Abstract

The invention discloses an intelligent gas density relay device, comprising: a gas relay body, which is used to monitor the gas density of target electrical equipment, and when the monitored gas density exceeds a preset gas density range, an alarm and/or a blocking contact signal is output to the external primary side equipment; the relay connector is used to transmit the gas in the target electrical equipment to the intelligent gas density relay device; the sensor measurement unit is used to obtain pressure data and temperature data; the wiring fault diagnosis unit is used to diagnose all Diagnose the wiring status of the alarm contact and/or the blocking contact of the gas density relay device, and when it is determined that the wiring status is abnormal, send an abnormal signal to the intelligent control unit; the intelligent control unit is used for according to the pressure data and temperature The data is used to obtain the gas density value, so as to monitor the gas density of the target electrical equipment; and to output contact wiring fault information to external equipment according to the abnormal signal.

Description

An intelligent gas density relay device

technical field

The present invention relates to the field of electric power technology, and more particularly, relates to an intelligent gas density relay device.

Background technique

SF6 switchgear has been widely used, and its reliable operation has become one of the important guarantees for the stable power supply of the power system. The SF6 density relay is an important device installed on the SF6 switch to monitor the change of gas density to ensure the insulation performance of the switch. If the gas density drops to the corresponding threshold value, an alarm or lockout will be generated to prevent vicious explosion accidents during the switch operation. Therefore, the quality of the density relay is directly related to whether the switch can operate normally.

Regular inspection or diagnosis of SF6 gas density relay on SF6 electrical equipment is a necessary measure to prevent problems before they happen and ensure the safe and reliable operation of SF6 electrical equipment. For this reason, it is very necessary to innovate and transform the existing gas density relay, so that the gas density relay can automatically complete the online diagnosis function, and then complete the regular diagnosis of the mechanical density relay without the need for maintenance personnel to go to the site.

Contents of the invention

The invention proposes an intelligent gas density relay device to solve the problem of how to realize online monitoring of gas density.

In order to solve the above problems, according to one aspect of the present invention, an intelligent gas density relay device is provided, which includes: a gas density relay body arranged in the first space in the relay casing, and a gas density relay body arranged in the relay casing Relay joints, multi-way joints, sensor measurement units, intelligent control units and at least one wiring fault diagnosis unit in the second space, the first space and the second space realize gas communication through the multi-way joints; wherein,

The gas relay body is connected to the target electrical equipment through the relay connector, and is used to monitor the gas density of the target electrical equipment, and when the monitored gas density exceeds the preset gas density range, output an alarm and/or block The contact signal is sent to the external primary side equipment;

The relay connector is arranged on the relay housing, connected with the target electrical equipment, and communicated with the multi-way connector, for transmitting the gas in the target electrical equipment to the smart gas density relay device;

The sensor measuring unit is connected with the intelligent control unit through the multi-way joint, and is used for collecting pressure and temperature, and obtaining pressure data and temperature data;

Each wiring fault diagnosis unit in the at least one wiring fault diagnosis unit is connected to the intelligent control unit, and is used for diagnosing the wiring status of the alarm contact and/or the locking contact of the gas density relay device, And when it is determined that the wiring state is abnormal, sending an abnormal signal to the intelligent control unit;

The intelligent control unit is used to obtain a gas density value based on the pressure data and temperature data, so as to monitor the gas density of the target electrical device; and is used to output contact wiring fault information to external devices according to the abnormal signal.

Preferably, the gas density relay body includes: an air bag, a sealed casing, a first bellows, a second bellows, a plurality of micro switches and a signal adjustment mechanism;

Wherein, the first open end of the first bellows is sealed and fixed on a wall of the sealed housing, and the second open end of the first bellows is sealingly connected with the first sealing member; the first bellows The inner wall of the pipe, the first sealing member, and one wall of the sealed housing jointly define a first sealed cavity; the first sealed cavity communicates with the insulating gas in the gas-insulated device; and the second sealed cavity communicates with the insulating gas in the gas-insulated device; The first open end of the bellows is in sealing connection with the first sealing member, the second opening end of the second bellows is in sealing connection with the second sealing member, the outer wall of the first bellows, the first sealing part, the outer wall of the second bellows, the second sealing member and the inner wall of the sealing housing jointly define a second sealing cavity, and the second sealing cavity is filled with compensation gas to form a temperature compensation An element; the signal adjustment mechanism is connected to the first sealing member, and the micro switch is set corresponding to the signal adjustment mechanism.

Preferably, the signal adjustment mechanism includes: an adjustment screw, an adjustment rod, a disc and a fixing nut;

Among them, the adjusting screw is set on the disc, and the alarm and locking contact action value of the gas density relay can be set by adjusting the adjusting screw; when air leakage occurs, the gas pressure in the first sealed cavity drops, and the The pressure difference between the pressure of the compensation gas and the gas pressure of the first sealed cavity becomes smaller, so that the signal adjustment mechanism moves downward, and when it reaches the preset position, the adjustment screw triggers the corresponding micro switch and sends out a corresponding Alarm contact or blocking contact signal.

Preferably, the sensor measurement unit includes: at least one pair of pressure sensor and temperature sensor; the intelligent control unit is used to obtain the pressure data obtained by the pressure sensor and the temperature data obtained by the temperature sensor, based on the gas pressure -The temperature characteristic is automatically converted into the gas density value corresponding to the preset temperature, so as to complete the online monitoring of the gas density of the target electrical equipment by the gas relay device.

Preferably, the intelligent control unit is further configured to: when the sensor measurement unit includes at least two pairs of pressure sensors and temperature sensors, determine the working state of the intelligent gas density relay device, and output the working state when the working state is abnormal Status abnormal alarm information;

Wherein, the intelligent control unit compares the obtained first pressure data with the second pressure data, obtains the first comparison result, and determines the working state of the intelligent gas density relay device according to the first comparison result;

Comparing the obtained first temperature data with the second temperature data, obtaining a second comparison result, and determining the working state of the smart gas density relay device according to the second comparison result; and/or

Comparing the obtained first gas density value with the second gas density value, obtaining a third comparison result, and determining the working state of the intelligent gas density relay device according to the third comparison result.

Preferably, the intelligent control unit automatically converts the acquired pressure data and temperature data into a gas density value corresponding to a preset temperature based on gas pressure-temperature characteristics.

Preferably, each wiring fault diagnosis unit includes: a first resistor R6, a rectifier bridge K, a second resistor R1, a third resistor R3, a fourth resistor R7, a fifth resistor R0, a field effect transistor Q, an optocoupler U , the first capacitor C3, the second capacitor C1 and the third capacitor C2; wherein, one end of the first resistor R6 and the fifth resistor R0 are respectively connected to the alarm or blocking contact PJ; the output end of the optocoupler U is connected to the intelligent control The units are connected; when the wiring of the alarm contact or the locking contact is correct, the field effect transistor Q is turned on, and then the optocoupler U is driven, and the optocoupler U outputs a logic low level, and the logic low level is collected by the intelligent control unit in real time On the contrary, if the wiring of the alarm contact or the locking contact is broken, there is no power access and/or the wiring is incorrect, the optocoupler U outputs a logic high level, and the logic high level is collected in real time by the intelligent control unit, so The intelligent control unit outputs and/or uploads contact wiring fault information.

Preferably, each contact wiring fault diagnosis unit further includes: a TVS tube D1 and a voltage regulator tube D2; wherein, the TVS tube is connected to the output end of the rectifier bridge K to absorb alarms or blocking contacts caused by external factors The transient high voltage input by the port; the voltage regulator tube D2 is connected in parallel to both ends of the third resistor R3 to ensure that the driving voltage of the field effect transistor Q is within a safe range.

Preferably, the device further includes a micro control valve, a micro pressure controller and a contact signal sampling unit; wherein,

One end of the micro-control valve is provided with an interface connected to the relay connector, and the other end of the micro-control valve is connected to the body of the gas density relay; the closed micro-control valve is used to The control command realizes the isolation or conduction of the gas density relay and the electrical equipment on the gas circuit;

The air path of the miniature pressure controller communicates with the body of the gas density relay; the miniature pressure controller is used to adjust the pressure rise and fall of the body of the gas density relay, so that the body of the gas density relay generates a contact signal action;

The contact signal sampling unit is directly or indirectly connected to the alarm contact and/or blocking contact of the gas density relay body, and is used to sample the contact signal of the alarm node and/or blocking contact of the gas density relay body and transmit it to The intelligent control unit makes the intelligent control unit detect the contact signal action value and/or return value of the gas density relay body according to the gas density value when the gas density relay body generates a contact signal action or switches, and completes the described On-line diagnosis of the gas density relay body.

Preferably, when the contact signal sampling unit is in a non-calibration state, it is relatively isolated from the gas density relay alarm or blocking contact signal on the circuit; in the verification state, the density relay contact signal control loop can be cut off to ensure During the inspection, the contact action signal of the gas density relay will not be uploaded, which will not affect the safe operation of the power grid.

Preferably, the micro control valve is a solenoid valve sealed in a cavity or housing.

Preferably, the intelligent control unit is also used for:

Calculate the temperature drop value △T and the pressure drop value △P according to the acquired temperature data and pressure data, and when │△P/△T│≥the first preset threshold value, issue a liquefaction notification signal and announce the time of gas liquefaction, and/or advertise the duration of gas liquefaction; or

When the temperature is higher than the set value Ts, calculate K1=│△P/△T│, and when the temperature is lower than the set value Ts, if it is determined according to the current pressure data and temperature data that │△P/△T│ ≥M*K1, where M is a preset coefficient, the intelligent control unit sends out a liquefaction notification signal, announces the time of gas liquefaction, and/or announces the duration of gas liquefaction.

Preferably, the intelligent control unit is also used to: automatically assign the communication address code of the gas relay, and the background terminal sends an addressing broadcast to each gas relay device; after receiving the addressing broadcast, the gas relay device that has not been assigned a device address, Judging whether the input level of the current self-arranging sequence identification signal is in a floating state or a preset level state; if so, the gas relay device will identify the address in the addressing broadcast as its own device address; if not, the The gas relay waits for the background to send the addressing broadcast of the next address; or

At the same time, the gas relay device is used as a Modbus slave station, the address range is 1-247, responds to the request initiated by the master station, and must accept the write command in the broadcast mode, and the address 0 is used as the broadcast address.

Preferably, wherein said device further comprises:

A status indicator light, connected to the intelligent control unit, used to indicate the working status of the gas density relay;

Moisture sensor for on-line monitoring gas micro-water value;

The nitrogen content sensor is arranged at the bottom of the relay housing and is connected with the intelligent control unit for diagnosing the leakage of SF6 gas, and when the gas density relay has SF6 gas leakage, the intelligent control unit outputs and /or upload SF6 gas leakage information;

The wireless communication unit is connected with the intelligent control unit, and is used to realize the link with the portable wireless reading instrument, so that the portable wireless reading instrument can read the data and/or information monitored by the intelligent gas density relay device;

A clock, connected to the intelligent control unit, is used to make the intelligent control unit control the display device to enter the non-display state at night according to the clock;

A photoelectric sensor, connected to the intelligent control unit, so that the intelligent control unit can control the display device to enter the non-display state at night according to the photoelectric sensor;

The miniature alarm bell is connected with the intelligent control unit, and is used to control the miniature alarm bell when the intelligent control unit detects that the pressure data and/or temperature data inside the gas chamber of the electrical equipment exceed the corresponding preset pressure threshold or temperature threshold send out an alarm signal;

The communication module is connected with the intelligent control unit and is used for uploading the data or information monitored by the intelligent control unit to the background monitoring terminal or the target device.

Preferably, wherein said device further comprises:

Display device, including: liquid crystal or digital tube, the display device is connected with the intelligent control unit, used to display but not limited to gas density value, temperature data, pressure data and working status indication; the display device is set at The intelligent gas density relay device is placed on the relay casing of the gas density relay device, or arranged outside the relay casing of the gas density relay; the display device is connected to the intelligent control unit in a wireless or wired manner.

Preferably, wherein said device further comprises:

The heat insulating element is arranged between the first space and the second space formed by the relay casing, and is used for heat insulation, so as to reduce the impact of the intelligent control unit on the monitoring accuracy of the density relay body.

The present invention provides an intelligent gas density relay device, which comprises: a gas density relay body arranged in the first space in the relay casing, a relay joint, a multi-channel relay arranged in the second space in the relay casing Joints, sensor measurement units, intelligent control units and at least one wiring fault diagnosis unit, through the device of the present invention, real-time monitoring of gas density of gas-insulated electrical equipment can be realized, and the monitoring of gas density of electrical equipment does not require manual maintenance, improving the reliability of the power grid. Improve efficiency and reduce cost; the device of the present invention can be applied in a gas density monitoring system based on the intelligent ubiquitous power Internet of Things, and can realize the mutual verification of the mechanical part and the electronic part of the gas density relay, realize maintenance-free or less maintenance, and improve Efficiency, reduce operation and maintenance costs, improve grid reliability, and ensure safe operation of the grid.

Description of drawings

A more complete understanding of the exemplary embodiments of the present invention can be had by referring to the following drawings:

Fig. 1 is a schematic structural diagram of an intelligent gas density relay device 100 according to an embodiment of the present invention;

Fig. 2 is an example diagram of an intelligent gas density relay device according to an embodiment of the present invention;

Fig. 3 is the control circuit of the intelligent gas density relay device according to the embodiment of the present invention;

Fig. 4 is a schematic diagram of the address assignment of the automatic assignment of relay communication address codes according to the embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units/elements are given the same reference numerals.

Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly formal meanings.

Fig. 1 is a schematic structural diagram of a smart gas density relay device 100 according to an embodiment of the present invention. As shown in Figure 1, the intelligent gas density relay device provided by the embodiment of the present invention can realize real-time monitoring of the gas density of gas-insulated electrical equipment, realize the gas density monitoring of electrical equipment without manual maintenance, improve the reliability of the power grid, improve efficiency, and reduce cost; the device of the present invention can be applied in a gas density monitoring system based on the intelligent ubiquitous power Internet of Things, and can realize the mutual verification of the mechanical part and the electronic part of the gas density relay, realize maintenance-free or less maintenance, improve efficiency, and reduce operation Maintenance costs, improve the reliability of the power grid, and ensure the safe operation of the power grid. The smart gas density relay device 100 provided in the embodiment of the present invention includes: a gas density relay body 101 arranged in the first space in the relay casing, and a relay connector 102 and a multi-way relay arranged in the second space in the relay casing. A joint 103 , a sensor measurement unit 104 , an intelligent control unit 106 and at least one wiring fault diagnosis unit 105 , the first space and the second space realize gas communication through the multi-way joint 103 .

Preferably, the gas relay body 101 is connected to the target electrical equipment through the relay connector, and is used to monitor the gas density of the target electrical equipment, and when the monitored gas density exceeds the preset gas density range, an alarm is output And/or block the contact signal to the external primary side device.

Preferably, the gas density relay body includes: an air bag, a sealed casing, a first bellows, a second bellows, a plurality of micro switches and a signal adjustment mechanism;

Wherein, the first open end of the first bellows is sealed and fixed on a wall of the sealed housing, and the second open end of the first bellows is sealingly connected with the first sealing member; the first bellows The inner wall of the pipe, the first sealing member, and one wall of the sealed housing jointly define a first sealed cavity; the first sealed cavity communicates with the insulating gas in the gas-insulated device; and the second sealed cavity communicates with the insulating gas in the gas-insulated device; The first open end of the bellows is in sealing connection with the first sealing member, the second opening end of the second bellows is in sealing connection with the second sealing member, the outer wall of the first bellows, the first sealing part, the outer wall of the second bellows, the second sealing member and the inner wall of the sealing housing jointly define a second sealing cavity, and the second sealing cavity is filled with compensation gas to form a temperature compensation An element; the signal adjustment mechanism is connected to the first sealing member, and the micro switch is set corresponding to the signal adjustment mechanism.

Preferably, the signal adjustment mechanism includes: an adjustment screw, an adjustment rod, a disc and a fixing nut;

Among them, the adjusting screw is set on the disc, and the alarm and locking contact action value of the gas density relay can be set by adjusting the adjusting screw; when air leakage occurs, the gas pressure in the first sealed cavity drops, and the The pressure difference between the pressure of the compensation gas and the gas pressure of the first sealed cavity becomes smaller, so that the signal adjustment mechanism moves downward, and when it reaches the preset position, the adjustment screw triggers the corresponding micro switch and sends out a corresponding Alarm contact or blocking contact signal.

Preferably, the relay connector 102 is set on the relay housing, connected with the target electrical device, and communicated with the multi-way connector 103, for transmitting the gas in the target electrical device to the smart Gas density relay device.

Preferably, the sensor measurement unit 104 is connected to the intelligent control unit through the multi-way joint, and is used for collecting pressure and temperature, and obtaining pressure data and temperature data.

Preferably, the sensor measurement unit includes: at least one pair of pressure sensor and temperature sensor; the intelligent control unit is used to obtain the pressure data obtained by the pressure sensor and the temperature data obtained by the temperature sensor, based on the gas pressure -The temperature characteristic is automatically converted into the gas density value corresponding to the preset temperature, so as to complete the online monitoring of the gas density of the target electrical equipment by the gas relay device.

Preferably, each wiring fault diagnosis unit 105 in the at least one wiring fault diagnosis unit is connected to the intelligent control unit for wiring the alarm contact and/or locking contact of the gas density relay device The state is diagnosed, and when it is determined that the wiring state is abnormal, an abnormal signal is sent to the intelligent control unit.

Preferably, each wiring fault diagnosis unit 105 includes: a first resistor R6, a rectifier bridge K, a second resistor R1, a third resistor R3, a fourth resistor R7, a fifth resistor R0, a field effect transistor Q, an optocoupler U, the first capacitor C3, the second capacitor C1 and the third capacitor C2; wherein, one end of the first resistor R6 and the fifth resistor R0 are respectively connected to the alarm or blocking contact PJ; the output end of the optocoupler U is connected to the smart The control unit is connected; when the wiring of the alarm contact or the locking contact is correct, the field effect transistor Q is turned on, and then the optocoupler U is driven, and the optocoupler U outputs a logic low level, and the logic low level is collected by the intelligent control unit in real time. On the contrary, if the wiring of the alarm contact or the locking contact is disconnected, there is no power access and/or the wiring is incorrect, the optocoupler U outputs a logic high level, and the logic high level is collected in real time by the intelligent control unit, The intelligent control unit outputs and/or uploads contact wiring fault information.

Preferably, each contact wiring fault diagnosis unit 105 further includes: a TVS tube D1 and a voltage regulator tube D2; wherein, the TVS tube is connected to the output end of the rectifier bridge K for absorbing alarms or blocking caused by external factors The transient high voltage input by the contact port; the regulator tube D2 is connected in parallel with both ends of the third resistor R3 to ensure that the drive voltage of the field effect tube Q is within a safe range.

Preferably, the intelligent control unit 106 is configured to acquire a gas density value based on the pressure data and temperature data, so as to monitor the gas density of the target electrical equipment; and to output contact wiring fault information to External devices.

Preferably, the intelligent control unit 106 is further configured to: when the sensor measurement unit includes at least two pairs of pressure sensors and temperature sensors, determine the working state of the intelligent gas density relay device, and output when the working state is abnormal Alarm information for abnormal working status;

Wherein, the intelligent control unit compares the obtained first pressure data with the second pressure data, obtains the first comparison result, and determines the working state of the intelligent gas density relay device according to the first comparison result;

Comparing the obtained first temperature data with the second temperature data, obtaining a second comparison result, and determining the working state of the smart gas density relay device according to the second comparison result; and/or

Comparing the obtained first gas density value with the second gas density value, obtaining a third comparison result, and determining the working state of the intelligent gas density relay device according to the third comparison result.

Preferably, the intelligent control unit 106 automatically converts the acquired pressure data and temperature data into a gas density value corresponding to a preset temperature based on gas pressure-temperature characteristics.

Preferably, the device further includes: a micro control valve, a micro pressure controller and a contact signal sampling unit; wherein,

One end of the micro-control valve is provided with an interface connected to the relay connector, and the other end of the micro-control valve is connected to the body of the gas density relay; the closed micro-control valve is used to The control command realizes the isolation or conduction of the gas density relay and the electrical equipment on the gas circuit;

The air path of the miniature pressure controller communicates with the body of the gas density relay; the miniature pressure controller is used to adjust the pressure rise and fall of the body of the gas density relay, so that the body of the gas density relay generates a contact signal action;

The contact signal sampling unit is directly or indirectly connected to the alarm contact and/or blocking contact of the gas density relay body, and is used to sample the contact signal of the alarm node and/or blocking contact of the gas density relay body and transmit it to The intelligent control unit makes the intelligent control unit detect the contact signal action value and/or return value of the gas density relay body according to the gas density value when the gas density relay body generates a contact signal action or switches, and completes the described On-line diagnosis of the gas density relay body.

Preferably, when the contact signal sampling unit is in a non-calibration state, it is relatively isolated from the gas density relay alarm or blocking contact signal on the circuit; in the verification state, the density relay contact signal control loop can be cut off to ensure During the inspection, the contact action signal of the gas density relay will not be uploaded, which will not affect the safe operation of the power grid.

Preferably, the micro control valve is a solenoid valve sealed in a cavity or housing.

Preferably, the intelligent control unit is also used for:

Calculate the temperature drop value △T and the pressure drop value △P according to the acquired temperature data and pressure data, and when │△P/△T│≥the first preset threshold value, issue a liquefaction notification signal and announce the time of gas liquefaction, and/or advertise the duration of gas liquefaction; or

When the temperature is higher than the set value Ts, calculate K1=│△P/△T│, and when the temperature is lower than the set value Ts, if it is determined according to the current pressure data and temperature data that │△P/△T│ ≥M*K1, where M is a preset coefficient, the intelligent control unit sends out a liquefaction notification signal, announces the time of gas liquefaction, and/or announces the duration of gas liquefaction.

Preferably, the intelligent control unit is also used to: automatically assign the communication address code of the gas relay, and the background terminal sends an addressing broadcast to each gas relay device; after receiving the addressing broadcast, the gas relay device that has not been assigned a device address, Judging whether the input level of the current self-arranging sequence identification signal is in a floating state or a preset level state; if so, the gas relay device will identify the address in the addressing broadcast as its own device address; if not, the The gas relay waits for the background to send the addressing broadcast of the next address; or

At the same time, the gas relay device is used as a Modbus slave station, the address range is 1-247, responds to the request initiated by the master station, and must accept the write command in the broadcast mode, and the address 0 is used as the broadcast address.

Preferably, wherein said device further comprises:

A status indicator light, connected to the intelligent control unit, used to indicate the working status of the gas density relay;

Moisture sensor for on-line monitoring gas micro-water value;

The nitrogen content sensor is arranged at the bottom of the relay housing and is connected with the intelligent control unit for diagnosing the leakage of SF6 gas, and when the gas density relay has SF6 gas leakage, the intelligent control unit outputs and /or upload SF6 gas leakage information;

The wireless communication unit is connected with the intelligent control unit, and is used to realize the link with the portable wireless reading instrument, so that the portable wireless reading instrument can read the data and/or information monitored by the intelligent gas density relay device;

A clock, connected to the intelligent control unit, is used to make the intelligent control unit control the display device to enter the non-display state at night according to the clock;

A photoelectric sensor, connected to the intelligent control unit, so that the intelligent control unit can control the display device to enter the non-display state at night according to the photoelectric sensor;

The miniature alarm bell is connected with the intelligent control unit, and is used to control the miniature alarm bell when the intelligent control unit detects that the pressure data and/or temperature data inside the gas chamber of the electrical equipment exceed the corresponding preset pressure threshold or temperature threshold send out an alarm signal;

The communication module is connected with the intelligent control unit and is used for uploading the data or information monitored by the intelligent control unit to the background monitoring terminal or the target device.

Preferably, wherein said device further comprises:

Display device, including: liquid crystal or digital tube, the display device is connected with the intelligent control unit, used to display but not limited to gas density value, temperature data, pressure data and working status indication; the display device is set at The intelligent gas density relay device is placed on the relay casing of the gas density relay device, or arranged outside the relay casing of the gas density relay; the display device is connected to the intelligent control unit in a wireless or wired manner.

Preferably, wherein said device further comprises:

The heat insulating element is arranged between the first space and the second space formed by the relay casing, and is used for heat insulation, so as to reduce the impact of the intelligent control unit on the monitoring accuracy of the density relay body.

The intelligent gas density relay for high-voltage electrical equipment provided by the present invention can be used to monitor the gas density of electrical equipment for gas insulation or arc extinguishing, and at the same time complete the online diagnosis of the gas density relay itself. Through the communication module, Upload the coded data and/or information to the Internet terminal, so that the Internet terminal can safely manage the current operating status of the gas density relay and electrical equipment, improve efficiency, reduce operation and maintenance costs, and ensure safe operation of the power grid.

Fig. 2 is an example diagram of a smart gas density relay device according to an embodiment of the present invention. As shown in Figure 2, the smart gas density relay device provided by the embodiment of the present invention includes: a relay housing 14, a gas density relay body 8, a relay connector 6, a multi-way connector 7, a first pressure sensor 1A, and a second pressure sensor 1B , a first temperature sensor 2A, a second temperature sensor 2B, a data display 11, at least one wiring fault diagnosis unit 9, an intelligent control unit 5, a micro control valve 3, a micro pressure controller 4, a contact signal sampling unit 10, and a status indicator light 12. A wireless communication unit 13 , a nitrogen content sensor 15 , a clock 16 , a photoelectric sensor 17 , a heater 18 and a thermal insulation 19 .

Wherein, the left part is the first space, and the right part is the second space, and the middle of the shell of the first space and the second space is isolated by a heat insulator; the relay joint 6, the multi-way joint 7, the first pressure sensor 1A, Second pressure sensor 1B, first temperature sensor 2A, second temperature sensor 2B, data display 11, at least one wiring fault diagnosis unit 9, intelligent control unit 5, miniature pressure controller 4, contact signal sampling unit 10, status indicator light 12. The clock 16, the photoelectric sensor 17, and the heater 18 are all located in the first space and set in the relay casing 1401. The gas density relay body 8, the micro control valve 3, and the nitrogen content sensor 15 are all located in the second space and set in the relay casing In 1402, the wireless communication unit 13 is arranged outside the casing; the multi-way connector 7 is connected to the relay connector 6; the gas density relay body 8, the first pressure sensor 1A, the second pressure sensor 1B, and the first temperature sensor 2A 1. The second temperature sensor 2B is respectively installed on the multi-way connector 7; the relay connector 6 is arranged on the relay shell.

The gas relay body 8 is used to monitor the gas density of the target electrical equipment, and when the monitored gas density exceeds the preset gas density range, output an alarm and/or block contact signal to the external primary side equipment.

The gas density relay body 8 mainly includes an air bag 801 , a sealed casing 802 , a first bellows 803 , a second bellows 804 , a plurality of micro switches 805 and a signal adjustment mechanism 806 . Specifically, the air bag 801 of the intelligent remote transmission gas density relay is mainly composed of a bellows and a seal, and the gas density relay body 8 mainly includes, wherein the first bellows 803 The first open end is sealed and fixed on a wall of the sealed housing 802, and the second open end of the first bellows 803 is sealingly connected with the first sealing member 807; the inner wall of the first bellows 803, the The first sealing member 807 and a wall of the sealing housing 802 jointly define a first sealing cavity 808; the first sealing cavity 808 communicates with the insulating gas in the gas-insulated device; and the second corrugated The first open end of the pipe 804 is in sealing connection with the first sealing member 807, the second opening end of the second bellows 804 is in sealing connection with the second sealing member 809, the outer wall of the first bellows 803, the The first sealing member 807, the outer wall of the second bellows 804, the second sealing member 809 and the inner wall of the sealing housing 802 jointly define a second sealing cavity 810, and the second sealing cavity 810 is filled with compensation gas to form a temperature compensation element; the signal adjustment mechanism 806 is connected to the first seal 807 , and the plurality of micro switches 805 are set corresponding to the signal adjustment mechanism 806 . The signal adjustment mechanism 806 mainly includes an adjustment screw 8061 , an adjustment rod 8063 , a disc 8062 , and a fixing nut 8064 , wherein the adjustment screw 8061 is arranged on the disc 8062 . The alarm and blocking contact action value of the gas density relay can be set by adjusting the adjusting screw 8061. When a gas leak occurs, the gas pressure of the first sealed cavity 808 drops, and the pressure difference between the pressure of the compensation gas in the second sealed cavity 801 and the gas pressure of the first sealed cavity 808 becomes smaller, so that The signal adjustment mechanism 806 moves downward to a certain extent, so that the adjustment screw 8061 triggers the corresponding micro switch 805, and sends out a corresponding alarm contact or locking contact signal.

As shown in Figure 2, the first pressure sensor 1A, the second pressure sensor 1B, the first temperature sensor 2A, the second temperature sensor 2B, the data display 11, and several wiring fault diagnosis units 9 are respectively connected to the intelligent control unit 5 . The intelligent control unit 5 acquires the gas density value P1 and temperature value T1 collected by the first pressure sensor 1A and the first temperature sensor 2A, and automatically converts them into corresponding gas density values at 20°C according to the gas pressure-temperature characteristics P1 ₂₀ , complete the online monitoring of the gas density of the electrical equipment monitored by the gas relay; or, the intelligent control unit obtains the gas density value P2 collected by the second pressure sensor 1B and the second temperature sensor 2B and temperature value T2, and automatically converted to the corresponding gas density value P2 ₂₀ at 20°C according to the gas pressure-temperature characteristics, to complete the online monitoring of the gas density of the electrical equipment monitored by the gas relay; the communication module will The monitored data or information includes, but is not limited to, P1 ₂₀ , P2 ₂₀ , and operating status information are alternately uploaded to the background monitoring terminal or target device.

The working principle or working process of the online self-diagnosis of the gas density relay of the present invention is as follows: the intelligent control unit 5 compares the first gas density value P1 collected by the first pressure sensor 1A and the value collected by the second pressure sensor 1B under the same gas pressure. The second gas density value P2 is compared and diagnosed. The intelligent control unit 5 compares the first gas density value P1 with the second gas density value P2 to obtain an error value |P1-P2|; if the error value |P1-P2| exceeds its preset threshold, the intelligent control unit 5 The control unit 5 outputs and/or uploads abnormal alarm information, indicating that there is a problem with the operation status of the first pressure sensor or the second pressure sensor of the gas density relay at this time, and operation and maintenance personnel need to go to the scene to deal with it. And if the error value |P1-P2| does not exceed its preset threshold and is within its preset threshold range, it means that the first pressure sensor or the second pressure sensor of the gas density relay is operating normally. And/or, the intelligent control unit 5 compares and diagnoses the first temperature value T1 collected by the first temperature sensor 2A and the second temperature value T2 collected by the second temperature sensor 2B at the same gas temperature. The intelligent control unit 5 compares the first temperature value T1 with the second temperature value T2 to obtain an error value |T1-T2|; if the error value |T1-T2| exceeds its preset threshold, the intelligent control unit 5 Output and/or upload abnormal alarm information, indicating that there is a problem with the operation of the first temperature sensor or the second temperature sensor of the gas density relay at this time, and operation and maintenance personnel need to go to the scene to deal with it. And if the error value |T1-T2| does not exceed its preset threshold and is within its preset threshold range, it means that the first temperature sensor or the second temperature sensor of the gas density relay is operating normally. Alternatively, the intelligent control unit 5 compares the first density value P1 ₂₀ obtained by the first pressure sensor 1A and the first temperature sensor 2A and the second density value obtained by the second pressure sensor 1B and the second temperature sensor 2B under the same gas density. The density value P2 ₂₀ is compared and diagnosed; the intelligent control unit 5 compares the first density value P1 ₂₀ with the second density value P2 ₂₀ to obtain the error value |P1 ₂₀ -P2 ₂₀ |; if the error value |P1 ₂₀ -P2 ₂₀ | Exceeding its preset threshold, the intelligent control unit 5 outputs and/or uploads abnormal alarm information, indicating that there is a problem with the operation status of the pressure sensor or temperature sensor of the gas density relay at this time, and operation and maintenance personnel need to go to the scene deal with. And if the error value |P1 ₂₀ -P2 ₂₀ | does not exceed its preset threshold value and is within its preset threshold value range, it means that all the pressure sensors and temperature sensors of the gas density relay are operating normally at this time.

Wherein, the data display 11 is mainly composed of liquid crystal or digital tube, and the data display 11 is connected with the intelligent control unit 5; Gas density value, working status indication. The intelligent control unit is provided with a communication module, and the communication module uploads the monitored data and/or information to the background monitoring terminal. The gas density relay also includes a wireless communication unit 13, the wireless communication unit 13 is connected to the intelligent control unit 5, through which the wireless communication unit 5 can realize the link with the portable wireless reading instrument, so that the portable wireless reading instrument can read Get the data and/or information monitored by the gas density relay. The intelligent control unit 5 also includes a status indicator light 12 ; the status indicator light 12 is connected with the intelligent control unit 5 to indicate the working status of the intelligent control unit 12 .

In the embodiment of the present invention, each wiring fault diagnosis unit 9 is configured to diagnose the wiring state of the alarm contact and/or the blocking contact of the gas density relay. If the wiring status of the alarm contact and/or the locking contact of the gas density relay is abnormal, the wiring fault diagnosis unit 9 outputs a signal to the intelligent control unit, and the intelligent control unit 5 outputs and/or uploads contact wiring fault information.

As shown in Figure 3, the contact wiring fault diagnosis unit 9 mainly includes a first resistor R6 (10MΩ), a rectifier bridge K, a second resistor R1 (1MΩ), a third resistor R3 (1MΩ), a fourth resistor R7 (1MΩ ), fifth resistor R0 (10MΩ), field effect transistor Q, optocoupler U, first capacitor C3, second capacitor C1, third capacitor C2, wherein first resistor R6 (10MΩ), rectifier bridge K, second resistor R1 (1MΩ), third resistor R3 (1MΩ), fourth resistor R7 (1MΩ), fifth resistor R0 (10MΩ), field effect transistor Q, optocoupler U, first capacitor C3, second capacitor C1, third Capacitor C2 forms a loop; wherein one end of the first resistor R6 (10MΩ) and the fifth resistor R0 (10MΩ) are respectively connected to the alarm or blocking contact P _J ; the output end of the optocoupler U is connected to the intelligent control unit; when When the wiring of the alarm or locking contact is correct, the voltage across the third resistor R3 (about 4.7V) can be obtained according to the principle of resistance voltage division, so that the field effect transistor Q is turned on, and then the optocoupler U is driven, and the optocoupler U outputs a logic low voltage Level, the logic low level is collected in real time by the intelligent control unit; on the contrary, if the alarm or the locking contact is disconnected, or there is no power supply, or the wiring is incorrect, the optocoupler U outputs a logic high level, which is determined by the The intelligent control unit collects the logic high level in real time, and the intelligent control unit outputs and/or uploads contact wiring fault information. The contact wiring fault diagnosis unit 9 also includes a TVS tube D1 and a voltage regulator tube D2. The TVS tube is connected to the output end of the rectifier bridge K, and its main function is to absorb the alarm or block the contact port input due to external reasons. The transient high voltage; the voltage regulator D2 is connected in parallel to both ends of the third resistor R3, and the voltage regulator D2 is used to ensure that the driving voltage of the field effect transistor Q is within a safe range. That is, in order to ensure the safety of the circuit, a D1TVS tube is added to absorb the transient high voltage input by the contact port due to external reasons, and a D2 (5.6V) regulator tube is added to ensure that the driving voltage of the Q FET is within a safe range.

In the present invention, in order to improve more diagnostic functions of the remote-transmission gas density relay with intelligent indication, the gas density relay of the present invention also includes: a micro control valve 3 , a micro pressure controller 4 and a contact signal sampling unit 10 . Wherein, one end of the micro control valve 3 is provided with an interface communicating with the relay joint 6, and the other end of the micro control valve 3 is in communication with the gas density relay body 8; The road communicates with the body 8 of the gas density relay. The micro pressure controller 4 is configured to adjust the pressure rise and fall of the gas density relay body, so that the gas density relay body 8 generates a contact signal action. The contact signal sampling unit 10 is directly or indirectly connected to the alarm/or blocking contact of the gas density relay body 8 and is configured to sample the alarm/or blocking contact signal of the gas density relay body 8 . The intelligent control unit 5 closes the micro control valve 3, so that the gas density relay is isolated from the electrical equipment on the gas circuit; the gas pressure rise and fall is adjusted by the micro pressure controller 4, so that the gas density relay generates an alarm and/or locks the contact signal action, and the contact The signal action is transmitted to the intelligent control unit 5 through the contact signal sampling unit, and the intelligent control unit 5 obtains the information of the first pressure sensor 1A and the first temperature sensor 2A when the gas density relay body 8 has a contact signal action or switches. The collected gas density value and temperature value are converted into the gas density value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value, and the action value of the contact signal (alarm or blocking contact) of the gas density relay body is detected P _1J20 And/or return value, to complete the online diagnosis of the gas density relay body; or, the intelligent control unit 5 obtains the contact signal action or switching of the gas density relay body, the second pressure sensor 1B and the second The gas density value and temperature value collected by the temperature sensor 2B are converted into the gas density value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value, and the contact signal (alarm or blocking contact) of the gas density relay body is detected The action value _P2J20 and/or the return value complete the online diagnosis of the gas density relay body. When the contact signal sampling unit 10 is in the non-calibration state, it is relatively isolated on the circuit from the gas density relay alarm or blocking contact signal. In the verification state, the density relay contact signal control loop can be cut off to ensure that the contact action signal of the gas density relay will not be uploaded during the inspection, which will not affect the safe operation of the power grid. The micro-control valve 3 is an electromagnetic valve, and the micro-control valve is sealed in a cavity or housing, further improving its sealing performance. A contact signal sampling unit 10, the contact signal sampling unit 10 is directly or indirectly connected to the alarm/or blocking contact of the gas density relay body 8, and is configured to sample the alarm/or blocking contact of the gas density relay body 8 P _J signal; its working process is: the intelligent control unit 5 closes the micro-control valve 3, so that the gas density relay body 8 is isolated from the electrical equipment on the gas circuit; the micro-control valve 3 is an electric micro-control valve, and the micro-control valve The control valve 3 is sealed in a cavity or housing, further improving its sealing performance. The gas pressure rise and fall is adjusted by the micro pressure controller 4, so that the gas density relay body 8 generates an alarm and/or locks the contact P _J signal action, and the contact P _J signal action is transmitted to the intelligent control unit 5 through the contact signal sampling unit 10. The control unit 5 obtains the gas density value P and temperature value T collected by the pressure sensor 1 and the temperature sensor 2 when the contact P _J signal of the gas density relay body 8 is activated or switched, and converts them according to the gas pressure-temperature characteristic Become the gas density value corresponding to 20°C, that is, the gas density value P ₂₀ , detect the contact signal (alarm or blocking contact) action value P _J20 and/or return value of the gas density relay body 8, and complete the gas density relay body 8 online diagnosis. Wherein, the miniature pressure controller 4 is an airtight air chamber 401, and a semiconductor 402 is arranged outside or inside the airtight air chamber 401. The outside of the air chamber 401 improves work efficiency. The semiconductor 402 is controlled by the intelligent control unit 5 in the cooling or heating mode, resulting in changes in the temperature of the gas in the airtight chamber 401, and then completing the rise and fall of the gas pressure. This method has very reliable sealing performance and ensures that it can be used in various It can work reliably in a harsh environment (extremely low or high temperature). When the contact signal sampling unit 10 is in the non-calibration state, it is relatively isolated on the circuit from the alarm or blocking contact signal of the gas density relay body 8 . In the verification state, the 8-contact signal control loop of the density relay body can be cut off to ensure that the contact action signal of the gas density relay will not be uploaded during the inspection, which will not affect the safe operation of the power grid. The contact signal sampling unit 10 mainly completes the sampling of the contact signal of the gas density relay body 8 . That is, the basic requirements or functions of the contact signal sampling unit 10 are: 1. It does not affect the safe operation of electrical equipment during verification. That is, during calibration, when the 8-contact signal of the gas density relay body moves, it will not affect the safe operation of electrical equipment; 2. The 8-contact signal control circuit of the gas density relay body will not affect the performance of the relay, especially the intelligent control unit The performance of the relay will not damage the relay or affect the test work.

The specific working principle of the intelligent gas density relay of the present invention is as follows: the intelligent control unit 5 of the relay monitors the gas pressure P and temperature T of the electrical equipment according to the pressure sensor 1 and the temperature sensor 2, and obtains the corresponding 20°C pressure value _P20 (ie gas density). In the case of allowing diagnostic verification, that is, if the gas density value P ₂₀ ≥ the set safety diagnostic verification density value P _S at this time; 402 enters the heating working mode. When the temperature value of the temperature controller of the micro pressure controller 4 reaches the set value, the relay sends an instruction, that is, the micro control valve 3 is closed through the intelligent control unit 5, so that the gas density relay body 8 is in the The gas circuit is separated from the electrical equipment. As shown in Figure 3, the relay then issues an instruction to disconnect the control loop of the gas density relay body 8 through the intelligent control unit 5, that is, the contacts JK11 and JK12 of the electromagnetic relay JK1 of the contact signal sampling unit 10 are disconnected, so that the online calibration When the gas density relay body is 8, it will not affect the safe operation of electrical equipment, and will not send an alarm signal by mistake or lock the control circuit during calibration. Because the relay has already monitored and judged the gas density value P ₂₀ ≥ the set safety calibration density value P _S before starting the calibration diagnosis, because the gas of the electrical equipment is within the safe operating range, and the gas leakage is slow The process of verification is safe. At the same time, the contacts JK21 and JK22 of the electromagnetic relay JK2 are closed, so that the contact P _J of the gas density relay body 8 is connected with the intelligent control unit 5 . Then turn off the semi-conductor 402 of miniature pressure controller 4 immediately, stop carrying out the heating mode of operation to semi-conductor 402, perhaps enter into refrigeration mode of operation, the temperature of the gas of the airtight air chamber 401 of miniature pressure controller 4 just reduces, airtight air chamber The pressure of the gas at 401 will gradually decrease, so that the density relay body 8 will generate an alarm and/or a blocking contact, and through the contacts JK21 and JK22, the intelligent control unit 5 will detect the alarm and/or blocking contact signal, and the intelligent control unit 5 will Immediately obtain the gas density value P and temperature value T collected by the pressure sensor 1 and temperature sensor 2, and convert it into a gas density value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P ₂₀ , and detect the gas The action value P _J20 of the contact signal (alarm or blocking contact) of the density relay body 8 completes the online verification and diagnosis of the action value of the gas density relay body 8 . Then, turn on the semiconductor 402 of the micro pressure controller 4 and enter into the heating operation mode, that is, turn on the semiconductor 402 and enter the heating operation mode, the temperature of the gas in the airtight chamber 401 of the micro pressure controller 4 will increase, and then airtight The pressure of the gas in the gas chamber 401 will gradually increase, so that the density relay body 8 generates an alarm and or the blocking contacts return respectively, and through the contacts JK21 and JK22, the alarm and or the blocking contacts return respectively, and the intelligent control unit 5 immediately Obtain the gas density value P and temperature value T collected by the pressure sensor 1 and temperature sensor 2, and convert it into a gas density value corresponding to 20°C according to the gas pressure-temperature characteristic, that is, the gas density value P ₂₀ , and detect the gas density The contact signal (alarm or blocking contact) of the relay body 8 returns a value P _F20 , completing the online verification and diagnosis of the return value of the gas density relay body 8 . The relay body 8 can check and diagnose repeatedly in this way for several times (for example, 2 to 3 times), and then calculate the average value. After completing the corresponding requirements, the calibration and diagnosis of the gas density relay body 8 is completed. Then the relay sends instructions to open the miniature control valve 3, so that the gas density relay body 8 is connected with the electrical equipment on the gas path; Then issue an instruction to connect the control loop of the gas density relay body 8 through the intelligent control unit 5, that is, the contacts JK11 and JK12 of the electromagnetic relay JK1 of the contact signal sampling unit 10 are closed, and the contacts JK21 and JK22 of JK2 are disconnected at the same time, so that The density monitoring circuit of the gas density relay body 8 works normally, so that the gas density relay body 8 can safely monitor the gas density of the electrical equipment, so that the electrical equipment can work safely and reliably. In this way, the online verification and diagnosis of the gas density relay body 8 is conveniently completed, and at the same time, the online verification of the gas density relay body 8 will not affect the safe operation of electrical equipment.

After the verification and diagnosis work of the gas density relay body 8 is completed, the intelligent control unit 5 is preset with the standard contact signal value P _B20 of the gas density relay, and the intelligent control unit sets the operating value P of the gas density relay body 8 _J20 is compared with the standard contact signal value P _B20 to obtain the contact signal difference |P _J20 -P _B20 |; if the contact signal difference |P _J20 -P _B20 | is within its preset threshold, the gas density relay The current working state of the monitoring part of the main body 8 is a normal working state, otherwise, it is an abnormal working state. At the same time, the intelligent control unit 5 further obtains the gas density value P and temperature value T collected by the pressure sensor 1 and the temperature sensor 2, and automatically converts it into the corresponding gas density value P at 20°C according to the gas pressure-temperature characteristic _20. Complete the on-line monitoring of the gas density of the electrical equipment monitored by the relay. That is, through the intelligent control unit 5, the contact action signal value P _J20 of the gas density relay body 8 at that time is collected in time, and the detected contact signal value P _J20 of the gas density relay body 8 is compared with the standard (rated parameter) required contact signal of the density relay. The value P _B20 is compared, if the consistency is good, it means that the gas density relay is working normally and no maintenance is required. That is, if │P _J20 -P _B20 │ is within its allowable setting value, it means that the gas density relay is working normally and no maintenance is required. The relay can be calibrated multiple times (for example, 2 to 3 times), and then calculate the average value according to each calibration result.

In this embodiment, the intelligent control unit 5 receives the gas density value P monitored by the first pressure sensor 1A or the second pressure sensor 1B, the temperature value T monitored by the first temperature sensor 2A or the first temperature sensor 22 , assuming that the temperature drop value is △T, and the corresponding pressure drop value is △P; if │△P/△T│≥preset threshold value, the intelligent control unit 5 sends a liquefaction notification signal and/or information, and/or the notification occurs The time of gas liquefaction, and/or the duration of notification gas liquefaction; or, when the temperature is higher than the set value Ts, the intelligent control unit 5 receives the first pressure sensor 1A or the second pressure sensor 1B to monitor The gas density value P, the temperature value T monitored by the first temperature sensor 2A or the first temperature sensor 22, assuming that the temperature drop value is ΔT, and the corresponding pressure drop value is ΔP, K1=│△P/△ T│, the intelligent control unit 5 saves the K1 value; and when the temperature is lower than the set value Ts, the intelligent control unit 5 receives the gas density monitored by the first pressure sensor 1A or the second pressure sensor 1B value P, the temperature value T monitored by the first temperature sensor 2A or the first temperature sensor 22, assuming that the temperature drop value is △T, the corresponding pressure drop value is △P, such as │△P/△T│≥M* K1, where M is a preset coefficient, the intelligent control unit 5 sends out a liquefaction notice signal and/or information, and/or announces the time of gas liquefaction, and/or announces the duration of gas liquefaction. Provide the basis and data support for the liquefaction treatment of SF6 gas.

In the present invention, the intelligent control unit 5 further includes: a state indicator light 12; the state indicator light 12 is connected with the intelligent control unit 5 to indicate the working state of the gas density relay, which is convenient for observation. The gas density relay also includes a micro-water sensor, which can monitor the micro-water value of the gas online; or, the gas density relay also includes a micro-water sensor and a gas circulation mechanism, which can monitor the micro-water value inside the gas online.

In addition, the gas density relay also includes: a wireless communication unit 13, the wireless communication unit 13 is connected to the intelligent control unit 5, through which the wireless communication unit 13 can realize the link with the portable wireless reading instrument, so that the portable The wireless readout reads the data and/or information monitored by the gas density relay.

In this embodiment, the gas density relay further includes: a nitrogen content sensor 15, the nitrogen content sensor 15 is arranged at the bottom of the relay housing 1402, the nitrogen content sensor 15 is connected to the intelligent control unit 5, the The nitrogen content sensor 15 is configured to diagnose the leakage of SF6 gas. When the gas density relay has SF6 gas leakage, the SF6 gas will accumulate at the bottom of the relay housing 1402 due to its high specificity, and the SF6 at the bottom of the relay housing 1402 The gas concentration is high, but the nitrogen content is reduced. When the intelligent control unit 5 monitors the nitrogen content lower than the preset threshold value N2 _HL through the nitrogen content sensor 15, the intelligent control unit 5 outputs and/or uploads SF6 Gas leak information.

The data display 11 can be arranged on the relay casing 14 of the gas density relay; or, the data display 11 can also be arranged outside the relay casing 14 of the gas density relay, and the data display 11 can be connected through wireless or wired The way is connected with the intelligent control unit 5.

Described gas density relay is also provided with clock 16, and described clock is connected with described intelligent control unit 5, and described intelligent control unit can make data display 11 enter non-display state at evening time according to clock; Or, described gas density The relay is also provided with a photoelectric sensor 17, which is connected to the intelligent control unit 5, and the intelligent control unit 5 can make the data display 11 enter the non-display state at night according to the photoelectric sensor 17. The purpose of this is to prolong the service life of the data display 11 while saving electric energy.

In order to improve the performance, the gas density relay also includes a thermal insulation 19, the thermal insulation 19 is arranged between the front 1401 and the rear 1402 of the housing 14, the thermal insulation 19 is configured to reduce the intelligent control unit 5 etc. The impact of heating of electronic components on the monitoring accuracy of the density relay body 8 improves the monitoring accuracy of the density relay body 8 .

The gas density relay also includes protection for the temperature of the electronic environment to prevent working at too low or too high a temperature and make it work within the allowable temperature range. Heater 18 and/or radiator (fan) can be set, heater 18 is turned on at low temperature, and radiator (fan) is turned on at high temperature to ensure that electronic components such as pressure sensor and/or intelligent control unit can operate in low temperature or high temperature environment. work reliably.

In addition, the intelligent remote-transmission gas density relay can also include a miniature alarm bell, which is connected to the intelligent control unit 5 and is configured to And/or when the temperature value exceeds the corresponding preset threshold value, the miniature alarm bell will send out an alarm signal. Specifically, when the intelligent control unit 5 collects the gas density value P of the pressure sensor 1 and/or the temperature sensor 2 or the preset threshold corresponding to the superhigh temperature value T, it indicates that the gas density value is too high and / Or the temperature value is too high, which indicates that there is a serious problem inside the electrical equipment. A warning is issued through the miniature alarm bell, and corresponding measures must be taken to ensure the safety of the on-site operation and maintenance personnel and avoid the expansion of the accident.

The intelligent control unit can automatically assign the communication address code of the gas relay, and the background terminal sends an address broadcast to each gas relay; the gas relay that has not been assigned a device address receives the address broadcast, and judges the input of the current sequence identification signal of itself Whether the level is in a floating state or a preset level state; if so, the gas relay will recognize the address in the addressing broadcast as its own device address; if not, the gas relay waits for the background to send the address of the next address address broadcast; or,

At the same time, the gas relays act as Modbus slave stations, with an address range of 1-247, responding to requests initiated by the master station, and must accept write commands in broadcast mode, with address 0 as the broadcast address. Referring to Fig. 4, the intelligent control unit 5 is provided with a communication module, and the communication module uploads the monitored data and/or information to the background terminal of the Internet, so that the background terminal of the Internet can carry out safety monitoring of the current gas density relay and electrical equipment. manage. The intelligent control unit can automatically assign relay communication address codes, and the background terminal sends addressing broadcasts to each relay; after receiving the addressing broadcasts, the relays that have not been assigned device addresses judge whether the input level of the current sequence identification signal of itself is It is in a floating state or a preset level state; if yes, the relay recognizes the address in the address broadcast as its own device address; if not, the relay waits for the address broadcast of the next address to be sent by the background. As shown in Figure 4. The sequence identification signal can be generated by the Internet background terminal or by the relay itself, wherein TX means uploaded data, and RX means received data. Based on the floating state of the input level, assign addresses (device addresses) to the relays ranked first, before the Internet background terminal initiates the relay address addressing process, that is, the Internet background terminal sends the first frame addressing broadcast to each relay Previously, each relay generated an arrangement order identification signal respectively, and set the input level of its own arrangement order identification signal to a floating state. After each relay receives the first frame addressing broadcast sent by the Internet background terminal, and before recognizing its own relay address (device address), it changes the output level of its sequence identification signal to low level or high level. level, so that the input levels of other relays after the sorting of the first relay are correspondingly changed to low level or high level. When the first-ranked relay recognizes the address in the first frame addressing broadcast as its own relay address based on the input level of its own sequence identification signal being in the floating state, the output level of its own sequence identification signal is changed from low to low. Level or high level, correspondingly changes to high level or low level, and then makes the input level of the second-ranked relay correspondingly change to high level or low level, and the other relays after the second sorted The input level of the relay remains low or high. This is very versatile and easy to use.

When the relay completes the diagnosis of the gas density relay body, it will automatically compare and judge with each other. If the error is large, it will issue an abnormal prompt: there is a problem with the gas density relay body or the pressure sensor and temperature sensor. That is to say, the relay can complete the mutual diagnosis function of the gas density relay body, the pressure sensor and the temperature sensor. In this way, there is no need to calibrate the gas density relay, and maintenance-free or less maintenance can be achieved.

The intelligent gas density relay of the present invention includes a relay housing, a gas density relay body 8, a relay joint 6, a multi-way joint 7, a first pressure sensor 1A, a second pressure sensor 1B, a first temperature sensor 2A, and a second temperature sensor 2B , Data display 11, several wiring fault diagnosis units 9 and intelligent control unit 5. The intelligent control unit compares and diagnoses the first gas density value P1 collected by the first pressure sensor 1A and the second gas density value P2 collected by the second pressure sensor 1B under the same gas pressure; and/or, the intelligent control unit The control unit compares and diagnoses the first temperature value T1 collected by the first temperature sensor 2A and the second temperature value T2 collected by the second temperature sensor 2B at the same gas temperature; Compare and diagnose the first density value obtained by the first pressure sensor 1A and the first temperature sensor 2A with the second density value obtained by the second pressure sensor 1B and the second temperature sensor 2B; obtain the current value of the gas density relay monitoring part Working state, when the working state is abnormal, output an alarm signal or/and alarm information; several wiring fault diagnosis units are configured to diagnose the alarm of the gas density relay or/and the wiring state of the locking contact, such as the gas density relay When the alarm or/and the wiring state of the blocking contact is abnormal, the wiring fault diagnosis unit outputs a signal to the intelligent control unit, and the intelligent control unit outputs or/and uploads the contact wiring fault information. In addition, the micro-control valve can be closed by the intelligent control unit, so that the gas density relay body is separated from the gas-insulated electrical equipment on the gas circuit; the pressure is adjusted by the micro-pressure controller, so that the density relay body has a contact action, and the contact action is passed through the contact signal sampling unit Passed to the intelligent control unit, the intelligent control unit detects the alarm and/or blocking contact action value and/or return value of the gas density relay body according to the density value of the contact action, and completes the online calibration of the gas density relay body, and The intelligent control unit uploads the monitored data or/and information to the Internet background terminal, so that the Internet background terminal can safely manage the current gas density relay body and electrical equipment. Diagnosis of the operation status of the gas density relay can be completed without the need for maintenance personnel to go to the site, which improves the reliability of the power grid, improves efficiency, reduces costs, and can realize maintenance-free or less maintenance of the gas density relay. At the same time, it also monitors the gas density of gas-insulated or arc-extinguished electrical equipment. At the same time, it can also realize the mutual verification of the mechanical part and the electronic part of the gas density relay, realize maintenance-free or less maintenance, greatly reduce operation and maintenance costs, and protect the power grid. safe operation. In a word, the present invention has the following meanings and characteristics: (1) can effectively reduce the operation and maintenance cost of the power supply company; (2) effectively improve the reliability and safety performance of the power grid; (3) effectively improve the management level of the power grid company; (4) Make the grid smarter and stronger.

The invention has been described with reference to a small number of embodiments. However, it is clear to a person skilled in the art that other embodiments than the invention disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/the/the [means, component, etc.]" are openly construed to mean at least one instance of said means, component, etc., unless expressly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall fall within the protection scope of the claims of the present invention.

Claims (16)

1. An intelligent gas density relay device, the device comprising: the gas density relay comprises a gas density relay body arranged in a first space in a relay shell, and a relay connector, a multi-way connector, a sensor measuring unit, an intelligent control unit and at least one wiring fault diagnosis unit which are arranged in a second space in the relay shell, wherein the first space and the second space are communicated through the multi-way connector; wherein,

The gas relay body is connected with target electrical equipment through the relay connector and is used for monitoring the gas density of the target electrical equipment and outputting an alarm and/or locking contact signal to external primary side equipment when the monitored gas density exceeds a preset gas density range;

the relay connector is arranged on the relay shell, connected with the target electrical equipment and communicated with the multi-way connector and used for transmitting gas in the target electrical equipment to the intelligent gas density relay device;

the sensor measuring unit is connected with the intelligent control unit through the multi-way joint and is used for collecting pressure and temperature and acquiring pressure data and temperature data;

each wiring fault diagnosis unit in the at least one wiring fault diagnosis unit is connected with the intelligent control unit and is used for diagnosing the wiring state of the alarm contact and/or the locking contact of the gas density relay device and sending an abnormal signal to the intelligent control unit when the wiring state is determined to be abnormal;

the intelligent control unit is used for acquiring a gas density value according to the pressure data and the temperature data so as to monitor the gas density of the target electrical equipment; and the device is used for outputting junction wiring fault information to external equipment according to the abnormal signal.

2. The apparatus of claim 1, wherein the gas density relay body comprises: the device comprises an air bag, a sealing shell, a first corrugated pipe, a second corrugated pipe, a plurality of micro switches and a signal adjusting mechanism;

the first opening end of the first corrugated pipe is fixed on one wall of the sealing shell in a sealing way, and the second opening end of the first corrugated pipe is connected with the first sealing element in a sealing way; an inner wall of the first bellows, the first seal, one wall of the seal housing together define a first sealed cavity; the first sealed cavity is communicated with insulating gas in the gas insulating equipment; the first opening end of the second corrugated pipe is in sealing connection with the first sealing element, the second opening end of the second corrugated pipe is in sealing connection with the second sealing element, and the outer wall of the first corrugated pipe, the first sealing element, the outer wall of the second corrugated pipe, the second sealing element and the inner wall of the sealing shell jointly define a second sealing cavity, and the second sealing cavity is filled with compensation gas to form a temperature compensation element; the signal adjusting mechanism is connected with the first sealing piece, and the micro switch is arranged corresponding to the signal adjusting mechanism.

3. The apparatus of claim 2, wherein the signal conditioning mechanism comprises: the device comprises an adjusting screw, an adjusting rod, a disc and a fixing nut;

the adjusting screw is arranged on the disc, and the alarm and locking contact action value of the gas density relay is set by adjusting the adjusting screw; when gas leakage occurs, the gas pressure of the first sealing cavity is reduced, the pressure difference between the pressure of the compensating gas filled in the second sealing cavity and the gas pressure of the first sealing cavity is reduced, the signal adjusting mechanism moves downwards, and when the signal adjusting mechanism reaches a preset position, the adjusting screw triggers the corresponding micro switch to send out a corresponding alarm contact or locking contact signal.

4. The apparatus of claim 1, wherein the sensor measurement unit comprises: at least one pair of pressure and temperature sensors; the intelligent control unit is used for automatically converting the pressure data acquired by the pressure sensor and the temperature data acquired by the temperature sensor into a gas density value corresponding to a preset temperature based on gas pressure-temperature characteristics, and completing on-line monitoring of the gas density of the target electrical equipment by the gas relay device.

5. The apparatus of claim 4, wherein the intelligent control unit is further configured to: when the sensor measuring unit comprises at least two pairs of pressure sensors and temperature sensors, the working state of the intelligent gas density relay device is determined, and when the working state is abnormal, abnormal working state alarming information is output;

the intelligent control unit compares the acquired first pressure data with the second pressure data to acquire a first comparison result, and determines the working state of the intelligent gas density relay device according to the first comparison result;

comparing the acquired first temperature data with second temperature data to acquire a second comparison result, and determining the working state of the intelligent gas density relay device according to the second comparison result; and/or

And comparing the acquired first gas density value with the second gas density value, acquiring a third comparison result, and determining the working state of the intelligent gas density relay device according to the third comparison result.

6. The apparatus according to claim 1 or 5, wherein the intelligent control unit automatically converts the acquired pressure data and temperature data into a gas density value corresponding to a preset temperature based on a gas pressure-temperature characteristic.

7. The apparatus of claim 1, wherein each wiring fault diagnosis unit comprises: the first resistor R6, the rectifier bridge K, the second resistor R1, the third resistor R3, the fourth resistor R7, the fifth resistor R0, the field effect transistor Q, the optocoupler U, the first capacitor C3, the second capacitor C1 and the third capacitor C2; one end of the first resistor R6 and one end of the fifth resistor R0 are respectively connected with an alarm or locking joint PJ; the output end of the optical coupler U is connected with the intelligent control unit; when the wiring of the alarm contact or the locking contact is correct, the field effect transistor Q is conducted, so that the optocoupler U is driven, the optocoupler U outputs a logic low level, and the intelligent control unit acquires the logic low level in real time; if the connection of the alarm contact or the locking contact is broken, no power is connected and/or the connection is incorrect, the optical coupler U outputs a logic high level, the intelligent control unit acquires the logic high level in real time, and the intelligent control unit outputs and/or uploads contact connection fault information.

8. The apparatus of claim 7, wherein each junction wiring fault diagnosis unit further comprises: a TVS tube D1 and a voltage stabilizing tube D2; the TVS tube is connected to the output end of the rectifier bridge K and is used for absorbing transient high voltage input by an alarm or locking contact port caused by external reasons; the voltage stabilizing tube D2 is connected in parallel with two ends of the third resistor R3 and is used for ensuring that the driving voltage of the field effect tube Q is within a safe range.

9. The device of claim 1, further comprising a micro control valve, a micro pressure controller, and a contact signal sampling unit; wherein,

one end of the micro control valve is provided with an interface communicated with a relay connector, and the other end of the micro control valve is communicated with the gas density relay body; the closing micro control valve is used for realizing the separation or conduction of the gas density relay and the electrical equipment on the gas path according to the control command of the intelligent control unit;

the gas circuit of the miniature pressure controller is communicated with the gas density relay body; the miniature pressure controller is used for adjusting the pressure rise and fall of the gas density relay body so that the gas density relay body generates contact signal action;

the contact signal sampling unit is directly or indirectly connected with the alarm contact and/or the locking contact of the gas density relay body and is used for sampling contact signals of the alarm node and/or the locking contact of the gas density relay body and transmitting the contact signals to the intelligent control unit, so that the intelligent control unit detects contact signal action values and/or return values of the gas density relay body according to the contact signal action or switching of the gas density relay body, and the on-line diagnosis of the gas density relay body is completed.

10. The apparatus of claim 9, wherein the contact signal sampling unit is electrically isolated from the gas density relay alarm or lockout contact signal when in a non-verified state; when in a verification state, the contact signal control loop of the density relay can be cut off, so that the contact action signal of the gas density relay can not be uploaded during verification, and the safe operation of a power grid can not be affected.

11. The device of claim 9, wherein the micro-control valve is a solenoid valve sealed within a cavity or housing.

12. The apparatus of claim 1, wherein the intelligent control unit is further configured to:

calculating a temperature decrease value DeltaT and a pressure decrease value DeltaP according to the acquired temperature data and pressure data, and sending out a liquefaction notification signal, a time for notifying occurrence of gas liquefaction and/or a duration for notifying occurrence of gas liquefaction when the I delta P/DeltaTI is not less than a first preset threshold value; or (b)

When the temperature is higher than a set value Ts, K1 delta P/[ delta ] T is calculated, and when the temperature is lower than the set value Ts, if meeting delta P/[ delta ] T is determined to be equal to or greater than M K1 according to the current pressure data and the temperature data, wherein M is a preset coefficient, the intelligent control unit sends out a liquefaction notification signal, a notification time for gas liquefaction and/or a notification duration time for gas liquefaction.

13. The apparatus of claim 1, wherein the intelligent control unit is further configured to: automatically distributing gas relay communication address codes, and sending addressing broadcast to each gas relay device by a background terminal; after receiving the addressing broadcast, the gas relay device without the equipment address judges whether the input level of the current self arrangement sequence identification signal is in a suspended state or a preset level state; if yes, the gas relay device identifies the address in the addressing broadcast as the address of the self equipment; if not, the gas relay waits for the background to send the addressing broadcast of the next address; or (b)

At the same time, the gas relay devices are all used as Modbus slave stations, the address range is 1-247, the gas relay devices respond to requests initiated by the master station and must accept write commands in a broadcasting mode, and the address 0 is used as a broadcasting address.

14. The apparatus of claim 1, wherein the apparatus further comprises:

the state indicator lamp is connected with the intelligent control unit and used for indicating the working state of the gas density relay;

the micro water sensor is used for monitoring the gas micro water value on line;

the nitrogen content sensor is arranged at the bottom of the relay shell, is connected with the intelligent control unit and is used for diagnosing the leakage condition of SF6 gas, and when SF6 gas leakage occurs in the gas density relay, the intelligent control unit outputs and/or uploads SF6 gas leakage information;

The wireless communication unit is connected with the intelligent control unit and is used for realizing the link with the portable wireless reader so that the portable wireless reader can read the data and/or information monitored by the intelligent gas density relay device;

the clock is connected with the intelligent control unit and is used for enabling the intelligent control unit to control the display equipment to enter a non-display state at night according to the clock;

the photoelectric sensor is connected with the intelligent control unit so that the intelligent control unit can control the display equipment to enter a non-display state at night according to the photoelectric sensor;

the miniature alarm bell is connected with the intelligent control unit and is used for controlling the miniature alarm bell to send an alarm signal when the intelligent control unit monitors that the pressure data and/or the temperature data in the air chamber of the electrical equipment are/is higher than the corresponding preset pressure threshold value or temperature threshold value;

the communication module is connected with the intelligent control unit and is used for uploading the data or information monitored by the intelligent control unit to the background monitoring terminal or the target equipment.

15. The apparatus of claim 1, wherein the apparatus further comprises:

a display device, comprising: the display device is connected with the intelligent control unit and is used for displaying gas density values, temperature data, pressure data and working state instructions; the display device is arranged on the relay shell of the intelligent gas density relay device or is arranged at a place outside the relay shell of the gas density relay; the display device is connected with the intelligent control unit in a wireless or wired mode.

16. The apparatus of claim 1, wherein the apparatus further comprises:

and the heat insulation piece is arranged between the first space and the second space formed by the relay shell and is used for heat insulation so as to reduce the influence of the intelligent control unit on the monitoring precision of the density relay body.

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