CN110416024B - Vibration-resistant digital display gas density relay - Google Patents

Vibration-resistant digital display gas density relay Download PDF

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Publication number
CN110416024B
CN110416024B CN201910830723.7A CN201910830723A CN110416024B CN 110416024 B CN110416024 B CN 110416024B CN 201910830723 A CN201910830723 A CN 201910830723A CN 110416024 B CN110416024 B CN 110416024B
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Prior art keywords
gas
value
gas density
digital display
accurate
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CN110416024A (en
Inventor
金海生
廖海明
常敏
曾伟
贺兵
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Shanghai Roye Electric Co Ltd
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Shanghai Roye Electric Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/005—Calibration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
    • G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
    • G01L27/005—Apparatus for calibrating pressure sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
    • G01N9/266—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences for determining gas density
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2671—Means to detect leaks in the pressure sensitive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/32—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by bellows

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid Mechanics (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

The present invention relates to power technology. The invention relates to an anti-vibration digital display gas density relay, which comprises: the signal mechanism and the indication display mechanism are relatively connected together; the signal mechanism is internally provided with a plurality of corrugated pipes, a temperature compensation element and a plurality of micro switches serving as contacts; monitoring the gas density through a plurality of corrugated pipes and temperature compensation elements of the signal mechanism, and combining a plurality of micro switches to realize the monitoring of the gas density, and outputting alarm or/and locking contact signals through the plurality of micro switches when the gas density is lower than or/and higher than the set gas density; the microprocessor of the indicating value display mechanism is respectively connected with the pressure sensor, the temperature sensor and the digital display element, acquires pressure and temperature signals, and obtains a corresponding density value P 20 through the processing of the microprocessor according to the pressure-temperature characteristics of the gas, and further displays the corresponding density value P 20 through the digital display element. The invention has good vibration resistance, high reliability, convenient on-site reading and flexible use.

Description

Vibration-resistant digital display gas density relay
Technical Field
The invention relates to the technical field of electric power, in particular to a gas density relay.
Background
Currently, gas density relays with micro-switches at the contact point are commonly used to monitor the density of insulating gas in gas insulated equipment. Fig. 1 is a schematic structural diagram of a conventional sulfur hexafluoride gas density relay, and as shown in fig. 1, micro switches used in the sulfur hexafluoride gas density relay are all provided with operation arms 1011, 1021, 1031, and the operation arms 1011, 1021, 1031 can be contacted with corresponding signal adjusting mechanisms. The gas density relay with the structure has the advantage of good electrical performance, but due to the fact that the length of the contact operation arm 102 is long and the contact operation arm belongs to a cantilever beam, extremely small vibration existing in the working environment can cause the vibration of the free end of the contact operation arm 102 to be large, so that the sulfur hexafluoride gas density relay can malfunction and even damage the micro switch, and the sulfur hexafluoride gas density relay cannot work normally. Therefore, how to provide a gas density relay with good vibration resistance is a technical problem that needs to be solved by those skilled in the art. In addition, since the density relays of many electrical devices are very high in installation position, if pointer+dial type readings are adopted, operation and maintenance personnel stand at different angles, the viewing angles are different, and the readings are different. On the other hand, when the electrical equipment is in tiny leakage, the gas pressure value of the electrical equipment is slowly reduced, if the reading is inaccurate, the leakage problem of the electrical equipment cannot be accurately and timely found, and the electrical equipment can be timely processed. If the gas cannot be found and treated in time, excessive SF 6 gas leaks into the atmosphere, so that the environment is damaged. The digital display type gas density relay with good vibration resistance and convenient and accurate reading becomes a technical problem which needs to be solved by the person skilled in the art, is beneficial to the safety of a power grid and is beneficial to the protection of the environment.
Disclosure of Invention
The invention aims to overcome the defects of the existing gas density device and provides an anti-vibration digital display gas density relay. The invention can improve the vibration resistance of the gas density relay, thereby improving the reliability of the gas density relay, and simultaneously facilitating the accurate reading of the digital display type gas density relay.
In order to achieve the above object, the present invention provides the following solutions: an anti-vibration digital display gas density relay, which comprises a power supply, comprising: the signal mechanism and the indication display mechanism are relatively connected together;
The signal mechanism is internally provided with a plurality of corrugated pipes for detecting the gas density in the electrical equipment, a temperature compensation element and a plurality of micro switches serving as contacts; monitoring the gas density through a plurality of corrugated pipes and temperature compensation elements of the signal mechanism, and combining a plurality of micro switches to realize the monitoring of the gas density, and outputting alarm or/and locking contact signals through the plurality of micro switches when the gas density is lower than or/and higher than the set gas density;
The indicating value display mechanism comprises a pressure sensor, a temperature sensor, a microprocessor and a digital display element; the microprocessor is respectively connected with the pressure sensor, the temperature sensor and the digital display element. The pressure sensor and the temperature sensor are used for collecting pressure and temperature signals, and the corresponding density value P20 is obtained through processing by the microprocessor according to the pressure-temperature characteristics of the gas, and then the corresponding density value P20 is displayed through the digital display element.
The signal mechanism comprises a shell, a first corrugated pipe, a second corrugated pipe, a micro switch and a signal regulating mechanism, wherein an opening at one end of the first corrugated pipe is sealed and fixed on the inner wall of the shell, and an opening at the other end of the first corrugated pipe is sealed by a first sealing element; the inner wall of the first bellows, the first seal, and the wall of the housing together define a first sealed cavity; the first sealed cavity is filled with compensation gas to form a temperature compensation element;
An opening at one end of the second corrugated pipe is in sealing connection with the first sealing element, an opening at the other end of the second corrugated pipe is in sealing connection with the second sealing element, and a second sealing cavity is formed by jointly defining 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 shell, and is communicated with insulating gas in the gas insulation equipment; the signal adjusting mechanism is connected with the first sealing piece, and the micro switch is arranged corresponding to the signal adjusting mechanism.
The first corrugated pipe is communicated with insulating gas in the gas insulation equipment; the inner wall of the first bellows, the first seal, the wall of the housing, and the gas insulation apparatus together define a first sealed cavity;
the outer wall of the first corrugated pipe, the first sealing piece, the outer wall of the second corrugated pipe, the second sealing piece and the inner wall of the shell jointly define a second sealing cavity, and compensation gas is filled in the second sealing cavity to form a temperature compensation element.
The extension part of the signal regulating mechanism extends into the second corrugated pipe, and the extension part is the end part of the signal regulating mechanism connected with the second corrugated pipe; or alternatively
The extension of the signal conditioning mechanism extends into the first bellows, wherein the extension of the signal conditioning mechanism is an end of the signal conditioning mechanism of a first seal connected to the first bellows.
The second corrugated pipe extends into the first corrugated pipe.
The vibration-resistant digital display gas density relay is characterized in that the signal adjusting mechanism is connected with the first sealing piece through the extending part.
The anti-vibration digital display gas density relay, the signal mechanism also includes: the spring and the spring fixing seat;
One end of the spring is connected to the position where the signal adjusting mechanism is connected with the corrugated pipe, and the other end of the spring is connected to the spring fixing seat; the spring fixing seat is fixedly arranged between the corrugated pipe and the micro switch.
The vibration-resistant digital display gas density relay is characterized in that the other end of the spring is connected with the spring fixing seat through a spring adjusting mechanism.
The anti-vibration digital display gas density relay is characterized in that the signal adjusting mechanism is provided with an adjusting screw.
The anti-vibration digital display gas density relay is characterized in that an insulating layer is wrapped outside the sealing cavity.
The anti-vibration digital display gas density relay is characterized in that the gas density relay is further provided with a temperature sensing bulb, and the compensation gas is connected with the temperature sensing bulb through a connecting gas pipe.
The vibration-resistant digital display gas density relay is characterized in that the pressure sensor and/or the temperature sensor is/are arranged in the second sealing cavity or the first sealing cavity.
The anti-vibration digital display gas density relay is characterized in that the digital display element and the microprocessor are independently arranged and connected with other devices of the gas density relay through a cable connection or a wireless connector.
The anti-vibration digital display gas density relay also comprises a communication module, and the microprocessor is connected with the communication module; the microprocessor collects pressure signals through the pressure sensor, collects temperature signals through the temperature sensor, and obtains a corresponding density value P20 through the processing of the microprocessor, and the density value, or the density value, the pressure value and the temperature value can be remotely transmitted through the communication module, so that the gas density value, or the density value, the pressure value and the temperature value of the electrical equipment can be monitored on line.
The temperature sensor and the temperature compensation element are arranged together.
The anti-vibration digital display gas density relay further comprises a heat insulation piece, wherein the heat insulation piece is arranged between the signal mechanism and the indication display mechanism, and the heat insulation piece is arranged at the power supply.
The anti-vibration digital display gas density relay also comprises an electromagnetic shielding piece, wherein the shielding piece is arranged inside or outside the indication display mechanism.
The vibration-resistant digital display gas density relay is characterized in that the pressure sensor is provided with a shielding piece.
The microprocessor or the communication module is provided with a shielding piece; or the microprocessor and the communication module are both provided with shielding pieces.
The anti-vibration digital display gas density relay also comprises a plurality of insulating pieces, and the pressure sensor is insulated from the shell of the density relay through the insulating pieces; or the housing of the pressure sensor and the housing of the gas density relay are insulated.
The micro-processor comprises an edge calculating unit, and the edge calculating unit carries out depth calculation processing on the obtained corresponding density value P 20 to obtain an accurate density value P20.
The anti-vibration digital display gas density relay is characterized in that the depth calculation processing is as follows: the edge calculation unit of the microprocessor calculates and processes the detected gas density value by adopting an average value method to obtain an average value P 20 Average of of the gas density value P 20, wherein the average value P 20 Average of is an accurate density value P 20 Accurate and accurate .
The anti-vibration digital display gas density relay comprises the following average value method: the method comprises the steps of setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all acquired density values at different time points to obtain an average value P 20 Average of of a gas density value P 20, so as to obtain an accurate density value P 20 Accurate and accurate ; or the average value calculation processing is carried out on the density values (N) of different temperature values acquired in all temperature ranges in a set time interval and a set temperature interval step length to obtain an average value P 20 Average of of the gas density value P 20, so that an accurate density value P 20 Accurate and accurate is obtained; or the average value calculation processing is carried out on the density values (N) of different pressure values acquired in all pressure change ranges in a set time interval and a set pressure interval step length to obtain an average value P 20 Average of of the gas density value P 20, so that an accurate density value P 20 Accurate and accurate is obtained.
The anti-vibration digital display gas density relay is characterized in that the depth calculation processing is as follows: the edge calculation unit of the microprocessor performs Fourier transform on the gas density value P 20 at certain intervals, converts the gas density value P 20 into a corresponding frequency spectrum, filters periodic components, and then calculates an accurate density value P 20 Accurate and accurate .
The anti-vibration digital display gas density relay is characterized in that the depth calculation processing is as follows: the edge computing unit of the microprocessor decomposes the components into trend, periodicity and random components according to the time sequence, and judges the gas leakage condition according to the trend components.
The edge computing unit of the microprocessor judges that the gas leaks, and when the trend component value is detected to be equal to or greater than the set trend component value, the microprocessor sends an alarm signal according to the set trend component value; and uploading the alarm signal to target equipment or a target platform.
The accurate density value P 20 Accurate and accurate is uploaded to the target equipment or the target platform through the communication module, so that the gas density value of the electrical equipment is accurately monitored on line; or alternatively
The accurate density value P 20 Accurate and accurate , the corresponding pressure value and the corresponding temperature value are uploaded to target equipment or a target platform through a communication module, so that the gas density value of the electrical equipment is comprehensively and accurately monitored on line;
The edge computing unit of the microprocessor completes the analysis, judgment and data storage of the data, and gives out corresponding alarm signals according to a set alarm strategy.
The anti-vibration digital display gas density relay is characterized in that the edge computing unit of the microprocessor is provided with: at set time intervals, when the trend change value DeltaP 20 of the gas density value P 20 of the monitored electrical equipment is not equal to the set trend change value DeltaP 20 Setting up , the monitor sends out an alarm signal; or sending out an alarm signal contact; or sending out alarm information; or upload the notification information.
The vibration-resistant digital display gas density relay is characterized in that the trend change value delta P 20 is as follows: the method comprises the steps of setting acquisition frequency in a set time interval, carrying out average value calculation processing on all acquired density values at different time points to obtain an average value P 20 Average of of a gas density value P 20, and setting a trend calculation period T to obtain a trend change value delta P20＝P20 Average of ( The former one T Period value )-P20 Average of (T cycle time ), namely a difference value of a period T before and after the average value P 20 Average of ; or alternatively
At a set time interval T, when the trend change value Δp 20＝P20( The former one T Spacing of )-P20(T Spacing of ) of the gas density value P20 of the monitored electrical equipment, that is, the difference value of the time interval T before and after the density value P 20; or alternatively
At a set time interval T, a set time length T is long. The method comprises the steps of adopting a set time interval T and a set acquisition frequency to carry out cumulative calculation on the density values P20 of all acquired different time points to obtain a cumulative value Sigma P 20, and obtaining a trend change value DeltaP 20＝∑P20( The former one T Length of )-∑P20( At present T Length of ), namely a difference value between a front time length T and a rear time length cumulative value Sigma P 20.
The edge calculation unit of the microprocessor is used for calculating the air leakage rate L of the monitored electrical equipment, wherein the air leakage rate L= [ delta ] P 20t/t＝(P20 Accurate and accurate t Front part -P20 Accurate and accurate t.)/t is calculated, and the formula is as follows: t is a set time interval, deltaP 20t is the density value variation in the time interval t, P 20 Accurate and accurate t Front part is the density value at the time immediately before the time interval t, and P20 Accurate and accurate t is the density value at the time when the time interval t passes; the monitor updates the notification information of the air leakage rate L in time; or update the uploading air leakage rate L notice information in time.
The edge computing unit of the microprocessor has a gas supplementing and controlling function for the monitored electrical equipment, and according to the set density value P 20 Qi tonifying needing to be supplemented, when the monitored density value P 20 Accurate and accurate is equal to or smaller than the density value P 20 Qi tonifying , the monitor sends out a gas supplementing alarm signal; or send out the alarm signal contact of air supplement; or sending out the notification information of the air supplement; or upload the qi-supplementing notification information.
The edge computing unit of the microprocessor is provided with gas supplementing time notification information for the monitored electrical equipment; according to the set density value P 20 Qi tonifying for air supplement, the air supplement time T Qi tonifying time ＝(P20 Accurate and accurate -P20 Qi tonifying )/L, the monitor updates and sends out the air supplement time notification information in time; or updating the uploading air-supplementing time information in time.
The edge computing unit of the microprocessor is provided with gas supplementing quality notification information for the monitored electrical equipment; according to the set density value P 20 Qi tonifying needing to be supplemented, the air chamber volume V of the electrical equipment and the edge calculation unit are calculated to obtain air supplementing quality Q Qi tonifying , and a monitor sends out the air supplementing quality Q Qi-tonifying information ; or uploading the gas make-up quality Q Qi-tonifying information .
The method for calculating the gas supplementing quality Q Qi tonifying by the edge calculating unit of the microprocessor is as follows: according to the density value P 20 Needs to be as follows of the air supplement, the mass density rho Needs to be as follows is obtained according to the density value P 20 Needs to be as follows of the air supplement and the gas characteristics of the air supplement, and the total required gas mass Q Total (S) ＝ρ Needs to be as follows V of the air chamber of the electrical equipment can be known; and the current detected density value P 20, the mass density ρ At present is obtained according to the current detected density value P 20 and the gas characteristics thereof, and the current gas mass Q At present ＝ρ At present x V of the electrical equipment gas chamber can be known; q Qi tonifying ＝Q Total (S) -Q At present is obtained; the monitor timely updates the notification information of the gas replenishing quality Q Qi tonifying ; or update the uploading gas make-up quality Q Qi-tonifying information in time.
The edge computing unit of the microprocessor is provided with air leakage notification information of the monitored electrical equipment; alarming according to the set air leakage alarming density value P 20 Air leakage , and sending out an air leakage alarming signal when the monitored density value P 20 Accurate and accurate is equal to or smaller than the air leakage alarming density value P 20 Air leakage alarm ; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set trend component value, when the monitored trend component value is equal to or greater than the set trend component value, the monitor sends out an air leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set time interval T, when the trend change value DeltaP 20 of the gas density value P 20 of the monitored electrical equipment is equal to or larger than the trend change value Delta P20 Setting up of the set gas density value P 20, the monitor sends out a gas leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set air leakage rate L, when the monitored air leakage rate L is equal to or greater than the set air leakage rate L Setting up , the monitor sends out an air leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or upload the air leakage notification information.
The edge calculating unit of the microprocessor is provided with a time interval value t set by correcting the air leakage rate L.
The anti-vibration digital display gas density relay further comprises a gas supplementing port, wherein the gas supplementing port is communicated with insulating gas in the gas insulation equipment, and the gas supplementing port is used for carrying out gas supplementing or/and micro-water testing on the electrical equipment; or alternatively
The gas density relay further comprises a self-sealing valve, wherein the self-sealing valve is communicated with insulating gas in the gas insulation equipment, and the self-sealing valve is used for conducting gas supplementing or/and micro-water testing on the electrical equipment.
The anti-vibration digital display gas density relay further comprises a check interface and a valve, and the gas density relay is checked in a non-dismantling mode through the check interface and the valve; or alternatively
The gas density relay further comprises a check interface and a valve, the gas density relay is checked in a non-dismantling mode through the check interface and the valve, or/and the electrical equipment is subjected to air supplementing and micro-water testing through the check interface.
Any one of the vibration-resistant digital display gas density relay is further provided with a heat insulation layer wrapping the first sealing cavity or/and the second sealing cavity
The invention has the beneficial effects that:
The gas density relay provided by the invention is composed of a signal mechanism and a value display mechanism which are relatively connected together. The control signal mechanism is realized by adopting a corrugated pipe and gas compensation, and has good stability, so that the vibration resistance of the gas density relay can be greatly improved. Meanwhile, an indication value display mechanism which is independent of the signal mechanism is provided, and the indication value display mechanism comprises a pressure sensor, a temperature sensor, a microprocessor and a digital display element. The corresponding density value P 20 (namely the pressure value P 20 at 20 ℃) is displayed through the digital display element, so that the digital display device is convenient to read accurately, can find leakage problems of electrical equipment in time, and can process the leakage problems in time. And excessive SF 6 gas cannot leak into the atmosphere, so that the environment is protected. The gas density relay provided by the invention has the advantages of convenience in production, low manufacturing cost, high monitoring precision, good electrical performance, long service life, capability of working under the oil-free condition and the like.
Drawings
FIG. 1 is a schematic diagram of a sulfur hexafluoride gas density relay of the prior art;
FIG. 2 is a schematic partial cross-sectional view of a first embodiment of the present invention;
fig. 3 is a schematic partial cross-sectional view of a second embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide the anti-vibration digital display gas density relay, which can improve the vibration resistance of the gas density relay, thereby improving the reliability of the gas density relay and simultaneously facilitating accurate reading.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
In this embodiment, the sulfur hexafluoride gas density relay is taken as an example, and the structure of the high vibration-resistant digital display gas density relay provided by the invention is introduced.
Fig. 2 is a schematic partial cross-sectional view of a high vibration-resistant digital gas density relay according to an embodiment of the present invention. As shown in fig. 2, an anti-vibration digital display gas density relay, the gas density relay is connected with a gas insulation device, the high anti-vibration digital display gas density relay comprises: the signal mechanism and the indication display mechanism are oppositely connected together. A plurality of bellows for detecting the gas density in the electrical equipment are arranged in the signal mechanism: a first corrugated pipe 2, a second corrugated pipe 3, a temperature compensation element formed by a sealed air chamber, and a plurality of micro switches 4 serving as joints; the temperature compensation element formed by the first corrugated pipe 2, the second corrugated pipe 3 and the sealed air chamber of the signal mechanism monitors the gas density and is combined with a plurality of micro switches 4 to monitor the gas density, and when the gas density is lower than or/and higher than the set gas density, an alarm or/and locking contact signal is output through the plurality of micro switches 4. The indication display mechanism 11 includes a pressure sensor 1101, a temperature sensor 1102, a microprocessor 1103, and a digital display unit 1104. The microprocessor 1103 is respectively connected with the pressure sensor 1101, the temperature sensor 1102 and the digital display element 1104. The pressure sensor 1101 and the temperature sensor 1102 collect the pressure P and the temperature signal T, and the corresponding density value P 20 (i.e. the pressure value P 20 at 20 ℃) is obtained through the processing of the microprocessor 1103 according to the pressure-temperature characteristics of the gas, and then the corresponding density value P 20 (i.e. the pressure value P 20 at 20 ℃) is displayed through the digital display element 1104.
Specifically, the signal mechanism mainly includes: the device comprises a shell 1, a first corrugated pipe 2, a second corrugated pipe 3, a micro switch 4, a signal adjusting mechanism 5 and a spring 6, wherein the shell 1 is provided with an opening, a first opening end of the first corrugated pipe 2 is fixed on the inner wall of the shell 1 through welding, the first corrugated pipe 2 is communicated with insulating gas in a gas insulation device 7 through the opening, and a second opening end of the first corrugated pipe 2 is in sealing connection with a first sealing piece 8; the inner wall of the first bellows 2, the first seal 8, the inner wall of the housing 1 and the gas insulation apparatus 7 together define a first sealed cavity A1;
The first opening end of the second corrugated pipe 3 is in sealing connection with the first sealing element 8, the second opening end of the second corrugated pipe 3 is in sealing connection with the second sealing element 9, the outer wall of the first corrugated pipe 2, the first sealing element 8, the outer wall of the second corrugated pipe 3, the second sealing element 9 and the inner wall of the shell 1 jointly define a second sealing cavity A2, and the second sealing cavity A2 is filled with compensation gas;
The signal adjusting mechanism 5 is connected with the first sealing element 8, the micro switch 4 is arranged corresponding to the signal adjusting mechanism 5, a first end of the spring 6 is connected to the connecting part of the signal adjusting mechanism 5, the first sealing element 8 and the second corrugated tube 3, a second end of the spring 6 is connected to the spring fixing seat 10 through the spring adjusting element, and the spring fixing seat 10 is arranged between the second corrugated tube 3 and the micro switch 4. In this embodiment, the signal adjusting mechanism 5 includes an adjusting screw 501, an adjusting rod 502, and a disc 503, where the adjusting screw 501 is disposed on the disc 503.
In this embodiment, the extension of the signal conditioning mechanism 5 extends into the second bellows 3 and is connected to the first seal 8, wherein the extension of the signal conditioning mechanism 5 is the end of the signal conditioning mechanism 5 connected to the second bellows 3. The spring fixing seat 10 is arranged between the second corrugated pipe 3 and the micro switch 4.
Further, the housing 1 of the gas relay provided in the present embodiment is further provided with a display mechanism 11 for displaying the density of the insulating gas in the gas insulation device.
As shown in fig. 2, the display mechanism 11 specifically includes: a pressure sensor 1101, a temperature sensor 1102, a microprocessor 1103 and a digital display element 1104; wherein,
The pressure sensor 1101 is in communication with the insulating gas in the gas insulating device 7 in a gas path, the temperature sensor 1102 and the pressure sensor 1101 are connected with the microprocessor 1103 in a circuit, and the digital display element 1104 is installed in the housing of the display mechanism 11. The pressure sensor 1101 and the temperature sensor 1102 collect the pressure P and the temperature signal T, and the corresponding density value P 20 (i.e. the pressure value P 20 at 20 ℃) is obtained through the processing of the microprocessor 1103 according to the pressure-temperature characteristics of the gas, and then the corresponding density value P 20 (i.e. the pressure value P 20 at 20 ℃) is displayed through the digital display element 1104. The gas density relay further comprises a communication module 1105, and the microprocessor 1103 is connected with the communication module 1105. The microprocessor 1103 collects the pressure signal P through the pressure sensor 1101, and the temperature signal T through the temperature sensor 1102, and the corresponding density value P 20 (i.e. the pressure value P 20 at 20 ℃) is obtained through the processing of the microprocessor 1103, and the density value, or the density value, the pressure value and the temperature value can be remotely transmitted through the communication module 1105, so that the gas density value, or the density value, the pressure value and the temperature value of the electrical equipment can be monitored on line.
Preferably, the gas density relay is further provided with a temperature sensing bulb, and the compensation gas is connected with the temperature sensing bulb through a connecting gas pipe, so that the gas density relay can be used for occasions with large temperature difference between the density relay and equipment. The gas density relay is further provided with an insulating layer 12 wrapping the first sealed cavity A1 and the second sealed cavity A2.
Further, the gas density relay provided in this embodiment is further provided with a holding mechanism and a reset mechanism after the signal operation.
Optionally, the first sealing member 8 is an integral part or is composed of a split part.
The working principle of the high vibration-resistant digital display gas density relay provided by the invention is as follows: after adjusting the adjusting screw 501, the sealing of the cavity A2 is typically achieved by welding. And then the sealed cavity A2 is vacuumized, and compensating gas with corresponding pressure is filled in the sealed cavity A2 according to the rated pressure, the alarm pressure, the locking pressure and other parameters of the high vibration resistance digital display gas density relay. The greater the density of the sealed cavity A2 and the sealed cavity A1 at the same ambient temperature, the greater the pressure. If SF6 (sulfur hexafluoride) electrical equipment does not leak gas, the high vibration resistance digital display gas density relay does not send out an alarm locking signal; if SF6 electrical equipment leaks, when SF6 gas density in the SF6 electrical equipment is close to or is lower than the density of the compensation gas in the sealed cavity A2, the high vibration-resistant digital display gas density relay sends out an alarm locking signal, and power grid safety is ensured.
The specific process is as follows: when the electrical equipment is normal, the density ρ 1 of the sealed air chamber A1 is greater than the density ρ 2 of the sealed air chamber A2, that is ρ 1>ρ2. When the gas pressure P1 of the sealed gas chamber A1 is greater than the pressure P2 of the sealed gas chamber A2, that is, the difference Δp between P1 and P2 is greater than a certain set value, it can be seen from fig. 2 that a corresponding distance L exists between the adjusting screw 501 and the micro switch 4, and at this time, the adjusting screw 501 of the signal adjusting mechanism 5 does not contact the micro switch 4, that is, does not trigger the micro switch 4, so that the micro switch 4 does not operate, and the contact signal thereof is not output. Conversely, if the gas insulation device leaks, the gas density value of the sealed gas chamber A1 decreases, and the gas pressure value of the sealed gas chamber A1 also decreases, when the density value thereof decreases to a certain degree (reaches an alarm or lock value) close to or lower than the gas density value of the sealed gas chamber A2, i.e., when Δp is smaller than a certain set value, L in fig. 2 decreases, and when L is smaller than a corresponding value, the adjusting screw 501 of the signal adjusting mechanism 5 contacts the micro switch 4, i.e., triggers the micro switch 4, so that the corresponding micro switch 4 contact is turned on, and a corresponding signal (alarm or lock) is sent, thereby monitoring and controlling the gas density in the high voltage switch and other devices, and making the electrical device work safely. And the pressure difference between the air chamber A1 and the air chamber A2 is changed, so that the adjusting lever 502 moves up and down, and the adjusting lever 502 is connected with the temperature sensor 1102 through the pressure sensor 1101. When the pressure changes, there is a pressure difference, which is transmitted to the temperature sensor 1102 through the adjustment lever 502 and the pressure sensor 1101, and the pressure is displayed on the microprocessor 1103 through the temperature sensor 1102 and the pointer 1103.
Fig. 3 is a schematic partial cross-sectional view of a high vibration-resistant digital gas density relay according to a second embodiment of the present invention. As shown in fig. 3, for more convenient and accurate reading, the display mechanism 11 and the signal mechanism in this embodiment are separately designed, and the display mechanism 11 and the signal mechanism are separately installed at different suitable positions. The gas density relay further comprises a cable connecting wire, wherein the digital display element 1104 or the digital display element 1104 and the microprocessor 1103 are independently arranged and connected with other devices of the gas density relay through the cable connecting wire; or the gas density relay further comprises a wireless connector, and the digital display element 1104 or the digital display element 1104 and the microprocessor 1103 are independently arranged and connected with other devices of the gas density relay through the wireless connector.
As shown in fig. 3, in the second embodiment, the first sealed cavity A1 and the second sealed cavity A2 are formed in the following manner: both ends of the first corrugated pipe 2 are sealed to form a first sealed cavity A1, and the first sealed cavity A1 is filled with compensation gas. The two ends of the second corrugated pipe 3 are sealed to form a second sealed cavity A2, the outer wall of the first corrugated pipe 2, the outer wall of the second corrugated pipe 3 and the inner wall of the shell 1 jointly define to form the second sealed cavity A2, and the second sealed cavity A2 is communicated with sulfur hexafluoride electrical equipment. The pressure sensor 1101 and/or the temperature sensor 1102 are provided in the second sealed cavity A2. The temperature sensor 1101 and the temperature compensation element 1102 are provided together.
The display mechanism 11 specifically includes: a pressure sensor 1101, a temperature sensor 1102, a microprocessor 1103, and a digital display element 1104. Wherein,
The pressure sensor 1101 and/or the temperature sensor 1102 are provided in the second sealed chamber A2, and the pressure sensor 1101 is in communication with the gas-insulated device 7 on the gas path. The pressure sensor 1101 and the temperature sensor 1102 are connected to the microprocessor 1103 by cables.
As shown in fig. 3, the display mechanism 11 and the signal mechanism in the embodiment are separately designed, and the display mechanism 11 and the signal mechanism are separately installed at different suitable positions, so that the display mechanism can be easily read. The same parts as those of the first embodiment will not be described in detail.
The vibration-resistant digital display gas density relay, the pressure sensor 1101 and/or the temperature sensor 1102 are/is arranged in the second sealed cavity A2. And may be specific to the design.
The temperature sensor is directly arranged on the temperature compensation element; or the temperature sensor is arranged at the temperature compensation element accessory. The gas density relay further comprises a heat insulating piece, wherein the heat insulating piece is arranged between the signal mechanism and the indication display mechanism; or the heat insulating piece is arranged at the power supply (power supply module) to ensure that the heating is not influenced on the monitoring of the gas density. The density relay further comprises a shielding member which can play a role in shielding an electric field, a magnetic field, or both. The shield is disposed either internally or externally to the indication display mechanism. The pressure sensor is provided with a shield. The microprocessor or the communication module is provided with a shielding piece; or the microprocessor and the communication module are both provided with shielding pieces. Through the design, the anti-interference capability of the density relay can be improved.
The gas density relay further comprises a plurality of insulating pieces, and the pressure sensor is insulated from the shell of the density relay through the insulating pieces; or the housing of the pressure sensor and the housing of the gas density relay are insulated. This improves the overvoltage resistance of the density relay.
Further, the micro-processor comprises an edge calculating unit, and the edge calculating unit carries out depth calculation processing on the obtained corresponding density value P 20 to obtain an accurate density value P 20 Accurate and accurate . The depth calculation process is as follows: the edge calculation unit of the microprocessor calculates the detected gas density value by an average method (mean method) to obtain an average value P 20 Average of of the gas density value P 20, wherein the average value P 20 Average of is an accurate density value P 20 Accurate and accurate . The average value method is as follows: the average value calculation processing is carried out on the density values (N) of different time points obtained by all collection in a set time interval and a set collection frequency, so that the average value P 20 Average of of the gas density value P 20 is obtained, and an accurate density value P 20 Accurate and accurate is obtained. The depth calculation process is as follows: the edge calculation unit of the microprocessor performs Fourier transform on the gas density value P 20 at certain intervals, converts the gas density value P 20 into a corresponding frequency spectrum, filters periodic components, and then calculates an accurate density value P 20 Accurate and accurate . The depth calculation process is as follows: the edge computing unit of the microprocessor decomposes the components into trend, periodicity and random components according to the time sequence, and judges the gas leakage condition according to the trend components. The edge computing unit of the microprocessor judges that the gas is leaked, and the microprocessor sends out an alarm signal or alarm information. The alarm signal can be uploaded to target equipment through a signal wire; and the alarm information is uploaded to the target equipment or the target platform through the communication module. (when the trend component value is detected to be equal to or greater than the set trend component value, depending on the set trend component value). The accurate density value P 20 Accurate and accurate is uploaded to target equipment or a target platform through a communication module, so that the gas density value of the electrical equipment is accurately monitored on line; or the accurate density value P 20 Accurate and accurate , the corresponding pressure value and the corresponding temperature value are uploaded to target equipment or a target platform through a communication module, so that the gas density value of the electrical equipment is comprehensively and accurately monitored on line; the edge computing unit of the microprocessor completes the analysis, judgment and data storage of the data, and gives out corresponding alarm signals according to the set alarm strategy. The edge calculating unit of the microprocessor comprises: at set time intervals, when the trend change value DeltaP 20 of the gas density value P 20 of the monitored electrical equipment is lower than or higher than the set trend change value DeltaP 20 Setting up , the monitor sends out an alarm signal; or sending out an alarm signal contact; or sending out alarm information; or upload the notification information. The trend change value Δp 20 is: the method comprises the steps of setting acquisition frequency in a set time interval, carrying out average value calculation processing on all acquired density values (N) at different time points to obtain an average value P 20 Average of of a gas density value P 20, and setting a trend calculation period T cycle time to obtain a trend change value delta P 20＝P20 Average of ( The former one T Period value )-P20 Average of (T cycle time ), namely a difference value between a period T cycle time before and after the average value P 20 Average of ; or alternatively
At a set time interval T, when the trend change value Δp 20＝P20( The former one T Spacing of )-P20(T Spacing of ) of the gas density value P 20 of the monitored electrical equipment, that is, the difference value of the time interval T before and after the density value P 20; or alternatively
At set time interval T, set time length T Length of . The integrated value sigma P20 is obtained by integrating the density values P 20 (N) of different time points obtained by all the collection at the set time interval T and the set collection frequency, and the trend change value delta P 20＝∑P20( The former one T Length of )-∑P20( At present T Length of ) is obtained, namely the difference value between the integrated values sigma P20 of the front and back time length T Length of .
The edge calculating unit of the microprocessor is provided with a function of calculating the air leakage rate L of the monitored electric equipment, wherein the air leakage rate L= [ delta ] P 20t/t＝(P20 Accurate and accurate t Front part -P20 Accurate and accurate t. ) And/t, wherein: t is a set time interval, Δp 20t is a pressure change amount within the time interval t, P 20 Accurate and accurate t Front part is a density value at a time immediately before the time interval t, and P 20 Accurate and accurate t is a density value at a time when the time interval t has elapsed. The monitor updates the notification information of the air leakage rate L in time; or update the uploading air leakage rate L notice information in time.
The edge computing unit of the microprocessor has a gas supplementing and controlling function for the monitored electrical equipment, and according to the density value P 20 Qi tonifying required to be supplemented, when the monitored density value P 20 Accurate and accurate is equal to or smaller than the density value P 20 Qi tonifying , the monitor sends out a supplementing and alarming signal; or send out the alarm signal contact of air supplement; or sending out the notification information of the air supplement; or upload the qi-supplementing notification information.
The edge calculation unit of the microprocessor is provided with gas supplementing time notification information for the monitored electrical equipment. According to the set density value P 20 Qi tonifying for air supplement, the air supplement time T Qi tonifying time ＝(P20 Accurate and accurate -P20 Qi tonifying )/L, the monitor updates and sends out the air supplement time notification information in time; or updating the uploading air-supplementing time information in time.
The edge calculation unit of the microprocessor is provided with gas supplementing quality notification information for the monitored electrical equipment. According to the set density value P 20 Qi tonifying needing to be supplemented, the air chamber volume V of the electrical equipment and the edge calculation unit are calculated to obtain air supplementing quality Q Qi tonifying , and a monitor sends out information of the air supplementing quality Q Qi tonifying ; or uploading the information of the gas supplementing quality Q Qi tonifying .
The method for calculating the gas supplementing quality Q Qi tonifying by the edge calculating unit of the microprocessor comprises the following steps: according to the density value P 20 Needs to be as follows of the air supplement, the mass density rho Needs to be as follows is obtained according to the density value P 20 Needs to be as follows of the air supplement and the gas characteristics of the air supplement, and the total required gas mass Q Total (S) ＝ρ Needs to be as follows V of the air chamber of the electrical equipment can be known; and the current detected density value P 20, the mass density ρ At present is obtained according to the current detected density value P 20 and the gas characteristics thereof, and the current gas mass Q At present ＝ρ At present x V of the electrical equipment gas chamber can be known; thus, Q Qi tonifying ＝Q Total (S) -Q At present can be obtained. The monitor timely updates the notification information of the gas replenishing quality Q Qi tonifying ; or timely updating the information of the air supplementing quality Q Qi tonifying . The edge calculation unit of the microprocessor has air leakage notification information for the monitored electrical equipment. According to the set leakage alarm density value P 20 Air leakage alarm , when the monitored density value P 20 Accurate and accurate is equal to or smaller than the leakage alarm density value P 20 Air leakage alarm , the monitor sends out a leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set trend component value, when the monitored trend component value is equal to or greater than the set trend component value, the monitor sends out an air leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set time interval T, when the trend change value DeltaP 20 of the gas density value P 20 of the monitored electric equipment is equal to or larger than the trend change value DeltaP 20 Setting up of the set gas density value P 20, the monitor sends out a gas leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set air leakage rate L Setting up , when the monitored air leakage rate L is equal to or greater than the set air leakage rate L Setting up , the monitor sends out an air leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or upload the air leakage notification information. The edge calculating unit of the microprocessor is provided with a time interval value t set by the corrected air leakage rate L.
The gas density relay further comprises a gas supplementing port, wherein the gas supplementing port is communicated with insulating gas in the gas insulation equipment, and gas supplementing or/and micro-water testing can be carried out on the electrical equipment through the gas supplementing port; or alternatively
The gas density relay further comprises a self-sealing valve, wherein the self-sealing valve is communicated with insulating gas in the gas insulation equipment, and the self-sealing valve can be used for carrying out gas supplementing or/and micro-water testing on the electrical equipment.
The gas density relay further comprises a check interface and a valve, and the gas density relay can be checked in a non-dismantling mode through the check interface and the valve; or alternatively
The gas density relay further comprises a check interface and a valve, the gas density relay can be checked in a non-dismantling mode through the check interface and the valve, or/and the electrical equipment can be subjected to air supplementing or/and micro-water testing through the check interface.
The gas density relay is further provided with an insulating layer wrapping the first sealing cavity and the second sealing cavity. The first sealing element is an integrated part or is composed of a split part. The digital display element is independently arranged and can be connected with the gas density relay in a wired or wireless mode. The communication module is in a wired or wireless mode. Through the edge calculation, the intelligent degree of the density relay can be further improved, and the safety of the power grid is guaranteed.
The gas density relay provided in this embodiment is applicable to all insulating gases such as sulfur hexafluoride gas mixture, nitrogen, dry air, compressed air, and the like, and is also applicable to monitoring the density of all insulating gases such as sulfur hexafluoride gas, sulfur hexafluoride gas mixture, nitrogen, dry air, compressed air, and the like, in addition to sulfur hexafluoride gas.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.

Claims (39)

1. The utility model provides a vibration-resistant digital display gas density relay, it includes the power, its characterized in that includes: the signal mechanism and the indication display mechanism are relatively connected together;
The signal mechanism is internally provided with a plurality of corrugated pipes for detecting the gas density in the electrical equipment, a temperature compensation element and a plurality of micro switches serving as contacts; monitoring the gas density through a plurality of corrugated pipes and temperature compensation elements of the signal mechanism, and combining a plurality of micro switches to realize the monitoring of the gas density, and outputting alarm or/and locking contact signals through the plurality of micro switches when the gas density is lower than or/and higher than the set gas density;
the indicating value display mechanism comprises a pressure sensor, a temperature sensor, a microprocessor and a digital display element; the microprocessor is respectively connected with the pressure sensor, the temperature sensor and the digital display element; acquiring pressure and temperature signals through a pressure sensor and a temperature sensor, processing the signals through a microprocessor according to the pressure-temperature characteristics of the gas to obtain a corresponding density value P 20, and displaying the corresponding density value P 20 through a digital display element;
The edge calculating unit of the microprocessor comprises: at set time intervals, when the trend change value DeltaP 20 of the gas density value P 20 of the monitored electrical equipment is not equal to the set trend change value DeltaP 20 Setting up , the monitor sends out an alarm signal; or sending out an alarm signal contact; or sending out alarm information; or upload the notification information.
2. The vibration-resistant digital display gas density relay according to claim 1, wherein the signal mechanism comprises a housing, a first corrugated pipe, a second corrugated pipe, a micro switch and a signal adjusting mechanism, wherein an opening of the first corrugated pipe is sealed and fixed on the inner wall of the housing, and an opening of the other end of the first corrugated pipe is sealed by a first sealing piece; the inner wall of the first bellows, the first seal, and the wall of the housing together define a first sealed cavity; the first sealed cavity is filled with compensation gas to form a temperature compensation element;
An opening at one end of the second corrugated pipe is in sealing connection with the first sealing element, an opening at the other end of the second corrugated pipe is in sealing connection with the second sealing element, and a second sealing cavity is formed by jointly defining 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 shell, and is communicated with insulating gas in the gas insulation equipment; 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 vibration-resistant digital display gas density relay according to claim 2, wherein the first bellows communicates with an insulating gas in the gas-insulating device; the inner wall of the first bellows, the first seal, the wall of the housing, and the gas insulation apparatus together define a first sealed cavity;
the outer wall of the first corrugated pipe, the first sealing piece, the outer wall of the second corrugated pipe, the second sealing piece and the inner wall of the shell jointly define a second sealing cavity, and compensation gas is filled in the second sealing cavity to form a temperature compensation element.
4. A vibration-resistant digital display gas density relay according to claim 2 or 3, wherein an extension of the signal conditioning mechanism extends into the second bellows, the extension being an end of the signal conditioning mechanism connected to the second bellows; or alternatively
The extension of the signal conditioning mechanism extends into the first bellows, wherein the extension of the signal conditioning mechanism is an end of the signal conditioning mechanism of a first seal connected to the first bellows.
5. A vibration-resistant digital display gas density relay according to claim 2 or 3, wherein the second bellows extends into the first bellows.
6. A vibration-resistant digital gas density relay according to claim 2 or 3, wherein the extension of the signal conditioning mechanism is in communication with the first seal.
7. The vibration-resistant digital display gas density relay according to claim 1, 2, or 3, wherein the signal mechanism further comprises: the spring and the spring fixing seat;
One end of the spring is connected to the position where the signal adjusting mechanism is connected with the corrugated pipe, and the other end of the spring is connected to the spring fixing seat; the spring fixing seat is fixedly arranged between the corrugated pipe and the micro switch.
8. The vibration-resistant digital display gas density relay according to claim 7, wherein the other end of the spring is connected to the spring fixing base through a spring adjusting mechanism.
9. The vibration-resistant digital display gas density relay according to claim 2, wherein the signal adjusting mechanism is provided with an adjusting screw.
10. A vibration-resistant digital display gas density relay according to claim 2 or 3, wherein the outside of the sealed cavity is wrapped with a heat-insulating layer.
11. The vibration-resistant digital display gas density relay according to claim 2, wherein the gas density relay is further provided with a bulb, and the compensation gas is connected with the bulb through a connecting gas pipe.
12. A vibration-resistant digital display gas density relay according to claim 2 or 3, characterized in that the pressure sensor and/or temperature sensor is arranged in the second sealed cavity or in the first sealed cavity.
13. The vibration-resistant digital display gas density relay according to claim 1, wherein the digital display element and the microprocessor are independently arranged and connected with other devices of the gas density relay through a cable connection or a wireless connector.
14. The vibration-resistant digital display gas density relay according to claim 1, wherein the gas density relay further comprises a communication module, and the microprocessor is connected with the communication module; the microprocessor collects pressure signals through the pressure sensor, collects temperature signals through the temperature sensor, and obtains a corresponding density value P 20 through the processing of the microprocessor, and the density value, or the density value, the pressure value and the temperature value can be remotely transmitted through the communication module, so that the gas density value, or the density value, the pressure value and the temperature value of the electrical equipment can be monitored on line.
15. The vibration-resistant digital display gas density relay according to claim 1, wherein the temperature sensor and the temperature compensation element are provided together.
16. The vibration-resistant digital display gas density relay according to claim 1, further comprising a heat insulating member disposed between the signal mechanism and the indication display mechanism, the heat insulating member being disposed at the power supply.
17. The vibration-resistant digital display gas density relay according to claim 1, further comprising an electromagnetic shield provided inside or outside the indication display mechanism.
18. The vibration-resistant digital display gas density relay according to claim 1, wherein the pressure sensor is provided with a shield.
19. The vibration-resistant digital display gas density relay according to claim 1, wherein the microprocessor or the communication module is provided with a shielding member; or the microprocessor and the communication module are both provided with shielding pieces.
20. The vibration-resistant digital display gas density relay according to claim 1, wherein the gas density relay further comprises a plurality of insulating members by which the pressure sensor is insulated from the housing of the density relay; or the housing of the pressure sensor and the housing of the gas density relay are insulated.
21. The vibration-resistant digital display gas density relay according to claim 1, wherein the microprocessor comprises an edge calculation unit, and the edge calculation unit performs depth calculation processing on the obtained corresponding density value P 20 to obtain an accurate density value P 20 Accurate and accurate .
22. The vibration-resistant digital display gas density relay according to claim 21, wherein the depth calculation process is: the edge calculation unit of the microprocessor calculates and processes the detected gas density value by adopting an average value method to obtain an average value P 20 Average of of the gas density value P 20, wherein the average value P 20 Average of is an accurate density value P 20 Accurate and accurate .
23. The vibration-resistant digital display gas density relay according to claim 22, wherein the average value method is: the method comprises the steps of setting acquisition frequency in a set time interval, and carrying out average value calculation processing on all acquired density values at different time points to obtain an average value P 20 Average of of a gas density value P 20, so as to obtain an accurate density value P 20 Accurate and accurate ; or alternatively
The average value calculation processing is carried out on the density values (N) of different temperature values acquired in all temperature ranges in a set time interval and a set temperature interval step length to obtain an average value P 20 Average of of a gas density value P 20, so that an accurate density value P 20 Accurate and accurate is obtained; or alternatively
The average value calculation processing is carried out on the density values (N) of different pressure values acquired in all pressure change ranges in a set time interval and a set pressure interval step length to obtain an average value P 20 Average of of the gas density value P 20, so that an accurate density value P 20 Accurate and accurate is obtained.
24. The vibration-resistant digital display gas density relay according to claim 21, wherein the depth calculation process is: the edge calculation unit of the microprocessor performs Fourier transform on the gas density value P 20 at certain intervals, converts the gas density value P 20 into a corresponding frequency spectrum, filters periodic components, and then calculates an accurate density value P 20 Accurate and accurate .
25. The vibration-resistant digital display gas density relay according to claim 21 or 24, wherein the depth calculation process is: the edge computing unit of the microprocessor decomposes the components into trend, periodicity and random components according to the time sequence, and judges the gas leakage condition according to the trend components.
26. The vibration-resistant type digital display gas density relay according to claim 25, wherein the edge calculating unit of the microprocessor judges that the gas is leaked, and when the trend component value is detected to be equal to or greater than the set trend component value, the microprocessor sends out an alarm signal according to the set trend component value; and uploading the alarm signal to target equipment or a target platform.
27. The vibration-resistant type digital display gas density relay according to claim 1,2,3 or 24, wherein the accurate density value P 20 Accurate and accurate is uploaded to the target device or target platform through the communication module, so as to accurately monitor the gas density value of the electrical device on line; or alternatively
The accurate density value P 20 Accurate and accurate , the corresponding pressure value and the corresponding temperature value are uploaded to target equipment or a target platform through the communication module, so that the accurate on-line monitoring of the gas density value of the electrical equipment is comprehensively realized.
28. The vibration-resistant digital display gas density relay according to claim 21, wherein the edge calculation unit of the microprocessor performs analysis, judgment and data storage of data, and gives out corresponding alarm signals according to a set alarm strategy.
29. The vibration-resistant digital display gas density relay according to claim 1, wherein the trend change value Δp 20 is: the method comprises the steps of setting acquisition frequency in a set time interval, carrying out average value calculation processing on all acquired density values at different time points to obtain an average value P 20 Average of of a gas density value P 20, and setting a trend calculation period T cycle time to obtain a trend change value delta P 20=P20 Average of （ The former one T Period value ）- P20 Average of （T cycle time ）, namely a difference value of a period T cycle time before and after the average value P 20 Average of ; or alternatively
At a set time interval T, when the trend change value Δp 20= P20（ The former one T Spacing of ）- P20（T Spacing of ） of the gas density value P 20 of the monitored electrical equipment, that is, the difference value of the time interval T before and after the density value P 20; or alternatively
At the set time interval T, the set time length T Length of ; is set at the set time interval T and the set acquisition frequency, and the density values P 20 at different time points obtained by all the acquisition are accumulated to obtain an accumulated value Σ P20, so as to obtain a trend change value Δp 20=∑P20（ The former one T Length of ）- ∑P20（ At present T Length of ）, namely, the difference between the accumulated values Σ P20 of the front and rear time lengths T Length of .
30. The vibration-resistant digital display gas density relay according to claim 21, wherein the edge calculating unit of the microprocessor calculates a leakage rate L of the monitored electrical device, wherein the leakage rate l= Δp 20t/t=（P20 Accurate and accurate t Front part - P20 Accurate and accurate t.)/t is as follows: t is a set time interval, deltaP 20t is the density value variation in the time interval t, P 20 Accurate and accurate t Front part is the density value at the time immediately before the time interval t, and P 20 Accurate and accurate t. is the density value at the time when the time interval t passes; the monitor updates the notification information of the air leakage rate L in time; or update the uploading air leakage rate L notice information in time.
31. The vibration-resistant digital display gas density relay according to claim 21, wherein the edge calculation unit of the microprocessor has a gas supplementing and controlling function for the monitored electrical equipment, and the monitor sends out a gas supplementing alarm signal when the monitored density value P 20 Accurate and accurate is equal to or smaller than the density value P 20 Qi tonifying according to the set density value P 20 Qi tonifying to be supplemented; or send out the alarm signal contact of air supplement; or sending out the notification information of the air supplement; or upload the qi-supplementing notification information.
32. The vibration-resistant digital display gas density relay according to claim 21, wherein the edge calculation unit of the microprocessor has gas replenishment time notification information for the monitored electrical equipment; according to the set density value P 20 Qi tonifying for air supplement, the air supplement time T Qi tonifying time =（ P20 Accurate and accurate -P20 Qi tonifying )/L, the monitor updates and sends out the air supplement time notification information in time; or updating the uploading air-supplementing time information in time.
33. The vibration-resistant digital display gas density relay according to claim 21, wherein the edge calculation unit of the microprocessor has gas make-up quality notification information for the monitored electrical equipment; according to the set density value P 20 Qi tonifying needing to be supplemented, the air chamber volume V of the electrical equipment and the edge calculation unit are calculated to obtain air supplementing quality Q Qi tonifying , and a monitor sends out information of the air supplementing quality Q Qi tonifying ; or uploading the information of the gas supplementing quality Q Qi tonifying .
34. The vibration-resistant digital display gas density relay according to claim 33, wherein the method for calculating the gas make-up quality Q Qi tonifying by the edge calculation unit of the microprocessor is as follows: according to the density value P 20 Needs to be as follows of the air supplement, the mass density rho Needs to be as follows is obtained according to the density value P 20 Needs to be as follows of the air supplement and the gas characteristics of the air supplement, and the total required gas mass Q Total (S) =ρ Needs to be as follows V of the air chamber of the electrical equipment can be known; and the current detected density value P 20, the mass density ρ At present is obtained according to the current detected density value P 20 and the gas characteristics thereof, and the current gas mass Q At present =ρ At present x V of the electrical equipment gas chamber can be known; q Qi tonifying = Q Total (S) - Q At present is obtained; the monitor timely updates the notification information of the gas replenishing quality Q Qi tonifying ; or timely updating the information of the air supplementing quality Q Qi tonifying .
35. The vibration-resistant digital display gas density relay according to claim 33, wherein the edge calculation unit of the microprocessor has a gas leakage notification information for the monitored electric device; according to the set leakage alarm density value P 20 Air leakage alarm , when the monitored density value P 20 Accurate and accurate is equal to or smaller than the leakage alarm density value P 20 Air leakage alarm , the monitor sends out a leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set trend component value, when the monitored trend component value is equal to or greater than the set trend component value, the monitor sends out an air leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set time interval T, when the trend change value DeltaP 20 of the gas density value P 20 of the monitored electric equipment is equal to or larger than the trend change value DeltaP 20 Setting up of the set gas density value P 20, the monitor sends out a gas leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or uploading the air leakage notification information; or alternatively
According to the set air leakage rate L Setting up , when the monitored air leakage rate L is equal to or greater than the set air leakage rate L Setting up , the monitor sends out an air leakage alarm signal; or a contact for sending out an air leakage alarm signal; or sending out air leakage notification information; or upload the air leakage notification information.
36. The vibration-resistant digital display gas density relay according to claim 30, wherein the edge calculating unit of the microprocessor has a time interval value t set for correcting the leak rate L.
37. The vibration-resistant type digital display gas density relay according to claim 1,2 or 3, further comprising a gas-supplementing port which communicates with the insulating gas in the gas-insulating device, and through which the electrical device is subjected to a gas-supplementing or/and micro-water test; or alternatively
The gas density relay further comprises a self-sealing valve, wherein the self-sealing valve is communicated with insulating gas in the gas insulation equipment, and the self-sealing valve is used for conducting gas supplementing or/and micro-water testing on the electrical equipment.
38. The vibration-resistant type digital display gas density relay according to claim 1,2 or 3, wherein the gas density relay further comprises a check interface and a valve through which the gas density relay is checked without disassembly; or alternatively
The gas density relay further comprises a check interface and a valve, the gas density relay is checked in a non-dismantling mode through the check interface and the valve, or/and the electrical equipment is subjected to air supplementing and micro-water testing through the check interface.
39. A vibration-resistant digital display gas density relay according to any one of claims 2-3, further provided with a heat insulating layer surrounding the first sealed cavity or/and the second sealed cavity.
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