CN111446110B - Gas density relay with intelligent monitoring of full service life and implementation method thereof - Google Patents
Gas density relay with intelligent monitoring of full service life and implementation method thereof Download PDFInfo
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- CN111446110B CN111446110B CN202010354509.1A CN202010354509A CN111446110B CN 111446110 B CN111446110 B CN 111446110B CN 202010354509 A CN202010354509 A CN 202010354509A CN 111446110 B CN111446110 B CN 111446110B
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- 238000012795 verification Methods 0.000 claims abstract description 44
- 230000008859 change Effects 0.000 claims abstract description 40
- 238000007789 sealing Methods 0.000 claims description 165
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 23
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Classifications
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- 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
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- 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
- H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
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Abstract
The application provides a gas density relay with intelligent monitoring of the whole service life and an implementation method thereof. The valve and the gas density relay body are both arranged on the pressure regulating mechanism, and the valve is opened or closed under the control of the pressure regulating mechanism, so that the gas path of the gas density relay body is ensured to be communicated with the electrical equipment when in operation and isolated from the electrical equipment when in verification; the pressure regulating mechanism comprises a first cavity, a second cavity and a third cavity which are communicated end to end, the first cavity is provided with a first pressure changing piece in a sliding manner, the first pressure changing piece can enter and exit the second cavity, and the third cavity is provided with a second pressure changing piece in a sliding manner; the second pressure change piece can be used for quickly adjusting the pressure rise and fall of the solar body density relay body, and the first pressure change piece can be used for slowly adjusting the pressure rise and fall of the solar body density relay body, so that the accurate verification of the density relay is realized.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a gas density relay applied to high-voltage and medium-voltage electrical equipment and capable of intelligently monitoring the whole service life and an implementation method thereof.
Background
The SF6 gas has the functions of arc extinction and insulation in high-voltage electrical equipment, and the density reduction and micro water content of the SF6 gas in the high-voltage electrical equipment seriously affect the safe operation of the SF6 high-voltage electrical equipment if exceeding the standards: the reduction of SF6 gas density to a certain extent will lead to a loss of insulation and arc extinction properties.
Along with the continuous and vigorous development of the intelligent power grid in China, the intelligent high-voltage electric equipment is used as an important component and a key node of an intelligent substation, and plays a role in the safety of the intelligent power grid. High-voltage electrical equipment is currently mostly SF6 gas insulation equipment, and if the gas density is reduced (such as caused by leakage, etc.), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation. It is now very common to monitor the gas density value in SF6 high voltage electrical equipment on-line, for which gas density monitoring system (gas density relay) applications will be developed vigorously. Whereas existing gas density monitoring systems (gas density relays) are basically: 1) The remote SF6 gas density relay is used for realizing the acquisition of density, pressure and temperature, uploading and realizing the on-line monitoring of gas density; 2) The gas density transmitter is used for realizing the acquisition, uploading and on-line monitoring of the density, the pressure and the temperature of the gas. SF6 gas density relay is core and key part, carries out periodic inspection to gas density relay on the electrical equipment, is the necessary measure of preventing to suffer from in the past, guarantee electrical equipment safe and reliable operation. Both the "procedure for preventive testing of electric power" and the "twenty-five major requirements for prevention of major accidents in electric power production" require periodic verification of the gas density relay. From the practical operation situation, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. At present, the verification of the gas density relay is very important and popular in a power system, and all power supply companies, power plants and large-scale factory and mine enterprises are implemented, and the power supply companies, the power plants and the large-scale factory and mine enterprises are provided with test personnel, equipment vehicles and high-value SF6 gas for completing the field verification and detection of the gas density relay, including power failure business loss during detection, rough calculation is carried out, the annual amortization detection cost of each high-voltage switch station is about tens of thousands to hundreds of thousands of yuan, and in addition, if the field verification of the detection personnel is not standard, the safety hazard exists. Therefore, innovation is very necessary in the existing gas density self-checking gas density relay, especially in the gas density on-line self-checking gas density relay or system, so that the gas density relay or the monitoring system for realizing on-line monitoring of the gas density also has the checking function of the gas density relay, thereby completing the periodic checking work of the (mechanical) gas density relay, avoiding the need of overhauling personnel to go to the site, greatly improving the working efficiency and reducing the operation and maintenance cost.
Disclosure of Invention
The invention aims to provide a gas density relay with intelligent monitoring of the whole service life and an implementation method thereof, so as to solve the problems in the technical background.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The first aspect of the present application provides a gas density relay for intelligent monitoring of a full life, comprising: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a valve, a pressure regulating mechanism for controlling a valve switch, an on-line check joint signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the valve is provided with an air inlet connected with the electrical equipment and an air outlet communicated with an air passage of the pressure regulating mechanism;
The pressure regulating mechanism comprises a first cavity, a second cavity and a third cavity which are communicated end to end in sequence, and one end of the third cavity, which is far away from the second cavity, is provided with an opening; the section specifications of the first cavity and the third cavity are larger than the section specifications of the second cavity; the side wall of the first cavity is provided with a first interface communicated with the gas path of the gas density relay body and a second interface communicated with the gas outlet of the valve, and the relative positions of the first interface and the second interface are staggered; the first cavity is internally provided with a first pressure change piece in a sliding manner, the first pressure change piece can movably enter and exit the second cavity, and the first pressure change piece is in sealing contact with the inner wall of the second cavity after entering the second cavity; the first pressure changing piece is connected with the second pressure changing piece through the first connecting piece, and the second pressure changing piece is arranged in the third cavity in a sliding manner and is in sealing contact with the inner wall of the third cavity; the second pressure change piece is connected with one end of a second connecting piece, and the other end of the second connecting piece extends out of the opening and then is connected with the driving part; the driving part drives the second connecting piece to drive the second pressure changing piece to move in the third cavity, and the second pressure changing piece drives the first connecting piece to drive the first pressure changing piece to move in the first cavity and the second cavity so as to control the opening and closing of the valve; the gas pressure in the pressure regulating mechanism changes along with the position changes of the first pressure changing piece and the second pressure changing piece, and is used for regulating the pressure rise and fall of the gas density relay body so as to enable the gas density relay body to generate contact signal actions;
The on-line checking contact signal sampling unit is connected with the gas density relay body and is configured to sample contact signals of the gas density relay body;
The intelligent control unit is respectively connected with the pressure regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit and is configured to complete control of the pressure regulating mechanism, pressure value acquisition and temperature value acquisition and/or gas density value acquisition and detect a joint signal action value and/or a joint signal return value of the gas density relay body;
Wherein the contact signal includes an alarm, and/or a latch.
The second aspect of the present application provides a gas density monitoring device for intelligent monitoring of a full life, comprising: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a valve, a pressure regulating mechanism for controlling a valve switch, an on-line check joint signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the valve is provided with an air inlet connected with the electrical equipment and an air outlet communicated with an air passage of the pressure regulating mechanism;
The pressure regulating mechanism comprises a first cavity, a second cavity and a third cavity which are communicated end to end in sequence, and one end of the third cavity, which is far away from the second cavity, is provided with an opening; the section specifications of the first cavity and the third cavity are larger than the section specifications of the second cavity; the side wall of the first cavity is provided with a first interface communicated with the gas path of the gas density relay body and a second interface communicated with the gas outlet of the valve, and the relative positions of the first interface and the second interface are staggered; the first cavity is internally provided with a first pressure change piece in a sliding manner, the first pressure change piece can movably enter and exit the second cavity, and the first pressure change piece is in sealing contact with the inner wall of the second cavity after entering the second cavity; the first pressure changing piece is connected with the second pressure changing piece through the first connecting piece, and the second pressure changing piece is arranged in the third cavity in a sliding manner and is in sealing contact with the inner wall of the third cavity; the second pressure change piece is connected with one end of a second connecting piece, and the other end of the second connecting piece extends out of the opening and then is connected with the driving part; the driving part drives the second connecting piece to drive the second pressure changing piece to move in the third cavity, and the second pressure changing piece drives the first connecting piece to drive the first pressure changing piece to move in the first cavity and the second cavity so as to control the opening and closing of the valve; the gas pressure in the pressure regulating mechanism changes along with the position changes of the first pressure changing piece and the second pressure changing piece, and is used for regulating the pressure rise and fall of the gas density relay body so as to enable the gas density relay body to generate contact signal actions;
The on-line checking contact signal sampling unit is connected with the gas density relay body and is configured to sample contact signals of the gas density relay body;
The intelligent control unit is respectively connected with the pressure regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit and is configured to complete control of the pressure regulating mechanism, pressure value acquisition and temperature value acquisition and/or gas density value acquisition and detect a joint signal action value and/or a joint signal return value of the gas density relay body;
Wherein the contact signal includes an alarm, and/or a latch.
Preferably, the valve comprises a valve body, an elastic piece and a valve core for blocking the air outlet; the valve body is of a middle-through structure, and the air inlet and the air outlet are arranged at two ends of the middle-through structure; the valve core is arranged in the middle through structure in a sliding way, one end of the valve core penetrates through the air outlet and extends into the first cavity of the pressure regulating mechanism partially, and a gap is reserved between the part of the valve core penetrating through the air outlet and the inner wall of the air outlet; the other end of the valve core is fixedly connected with one end of the elastic piece, and the other end of the elastic piece is fixed at the air inlet; the valve core has a first position and a second position that move in an axial direction of the valve body; when the valve core is positioned at the first position, the air outlet is blocked; when the valve core is positioned at the second position, the air inlet and the air outlet are communicated.
More preferably, the first pressure changing member applies a force to the valve element under the drive of the driving member to push the valve element to move in the direction of the intake port in the valve body, the outer edge surface of the valve element is separated from the inner wall of the valve body, and the elastic member is in a compressed state.
More preferably, the valve element, the elastic member, the first connecting member, and the second connecting member are located on the same axis.
More preferably, the elastic member is a return spring.
More preferably, a fixing piece is arranged at the air inlet of the valve, the elastic piece is clamped between the valve core and the fixing piece, and a through hole for passing gas is formed in the fixing piece.
More preferably, the valve core is provided with a sealing piece which is in sealing fit with the inner wall of the valve body; and/or the valve body is provided with a sealing element which is connected with the pressure regulating mechanism in a sealing way; and/or the valve body is provided with a sealing element which is connected with electrical equipment in a sealing way.
Further, the sealing element is any one of a rubber ring, a rubber pad or an O-shaped ring.
More preferably, the valve core comprises a valve rod and a valve clack, wherein the valve clack is fixed on the valve rod, and one end of the valve rod penetrates through the air outlet and extends into the first cavity of the pressure regulating mechanism partially; the inner wall of the valve body is provided with a funnel-shaped inclined plane, the outer edge surface of the valve clack is in sealing fit with the inclined plane of the inner wall of the valve body, and the air outlet is blocked.
More preferably, the valve core comprises a sealing ball and a push rod, and one end of the push rod penetrates through the air outlet and extends into the first cavity of the pressure regulating mechanism partially; the other end of the ejector rod is fixedly connected with one end of the sealing ball, and the other end of the sealing ball is fixedly connected with the elastic piece.
Further, the inner wall of the valve body is provided with a funnel-shaped inclined surface, the outer edge surface of the sealing ball is in sealing fit with the inclined surface of the inner wall of the valve body, and the air outlet is blocked.
Further, the ejector rod is T-shaped, the end part of the long section of the ejector rod penetrates through the air outlet and partially extends into the first cavity of the pressure regulating mechanism, and one side, back to the long section, of the short section of the ejector rod is fixedly connected with one end of the sealing ball.
Further, the short section is a sealing disc for sealing the air outlet.
Furthermore, the short section of the ejector rod is used for sealing the working surface of the air outlet, and a gasket made of elastic rubber is further arranged on the working surface.
Further, the inner diameter of the air outlet is gradually reduced from the inside of the valve body to the first cavity of the pressure regulating mechanism along the axis of the ejector rod, the outer edge surface of the sealing ball is in sealing fit with the inclined surface of the air outlet, and the air outlet is blocked.
Furthermore, a gasket made of elastic rubber is further arranged on the inner wall of the valve body where the air outlet is located, a sealing hole coaxial with the air outlet is formed in the middle of the gasket, and the inner diameter of the sealing hole is smaller than the diameter of the sealing ball.
Preferably, the pressure regulating mechanism is sealed within a cavity or housing.
More preferably, the drive member is disposed within the cavity or housing.
Preferably, the driving part comprises one of a magnetic force, a motor, an electric push rod motor, a stepping motor, a reciprocating mechanism, a Carnot circulation mechanism, an air compressor, a deflation valve, a pressure-making pump, a booster valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust generation mechanism, an electric heating thrust generation mechanism and a chemical reaction thrust generation mechanism.
Preferably, the first pressure changing member and the second pressure changing member are pistons or sealing spacers.
Preferably, a first partition sealing member is further arranged on the first pressure changing member, and the first pressure changing member is in sealing contact with the inner wall of the second cavity through the first partition sealing member; and the second pressure change piece is also provided with a second partition sealing piece, and the second pressure change piece is in sealing contact with the inner wall of the third cavity through the second partition sealing piece.
More preferably, the first partition seal and the second partition seal are any one of rubber rings, rubber pads and O-rings.
Preferably, the pressure regulating mechanism further comprises a connecting pipe, and the first connector on the air chamber is communicated with the air passage of the gas density relay through the connecting pipe.
Preferably, the pressure regulating mechanism further comprises a sealing coupling member, one end of the sealing coupling member is in sealing connection with the opening of the third cavity, the other end of the sealing coupling member is in sealing connection with the driving end of the driving part, or the sealing coupling member is used for sealing and wrapping the second connecting member and the driving part in the sealing coupling member.
More preferably, the sealing joint comprises one of a bellows, a sealing bladder, a sealing ring.
Preferably, the gas density relay or the gas density monitoring device further comprises: the air inlet of the valve is communicated with the air path of the electrical equipment through the multi-way joint.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the on-line monitoring of the gas density of the monitored electrical equipment by the gas density relay or the gas density monitoring device.
More preferably, the intelligent control unit calculates an average value P 20 Day average of the gas density value P 20 by adopting an average method on the gas density value monitored in a day time according to a preset sampling frequency, wherein the average value P 20 Day average is an accurate day density value P 20 Tianzhuang (Chinese character) ; or the intelligent control unit performs Fourier transform on the gas density value P 20 monitored in the time of day, converts the gas density value P 20 into a corresponding frequency spectrum, and filters out periodic components to obtain an accurate day density value P 20 Tianzhuang (Chinese character) .
Further, the intelligent control unit obtains a maximum density value P 20max and a minimum density value P 20min within a day, and further obtains a first density difference DeltaP 1 20＝P20max-P20 Tianzhuang (Chinese character) , and according to the gas pressure temperature characteristic of the day density value P 20 Tianzhuang (Chinese character) , a first temperature difference DeltaT 1 corresponding to the first density difference DeltaP 1 20 is obtained; likewise, a second density difference DeltaP 2 20＝P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference DeltaT 2 corresponding to the second density difference DeltaP 2 20 is obtained according to the pressure and temperature characteristics of the gas with the natural density value of P 20 Tianzhuang (Chinese character) ; the largest value of the first temperature difference DeltaT 1 and the second temperature difference DeltaT 2 is the maximum temperature difference DeltaTmax of the corresponding date; or alternatively
The intelligent control unit obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) in a day time, so as to obtain a first density difference delta P1 20＝P20max-P20 Tianzhuang (Chinese character) , and obtains a first temperature difference delta T1= delta P1 20/K according to a gas pressure temperature curve slope formula K= delta P/[ delta ] T with the daily density value P 20 Tianzhuang (Chinese character) ; likewise, a second density difference Δp2 20＝P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference Δt2= Δp2 20/K is obtained; the largest value of the first temperature difference DeltaT 1 and the second temperature difference DeltaT 2 is the maximum temperature difference DeltaTmax of the corresponding date; wherein DeltaP is the pressure difference on the gas pressure temperature curve with the density value of P 20 Tianzhuang (Chinese character) , deltaT is the temperature difference corresponding to the pressure difference DeltaP; or alternatively
The intelligent control unit obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) within a day time, further obtains a first density difference value delta P1 20＝P20max-P20 Tianzhuang (Chinese character) and a second density difference value delta P2 20＝P20 Tianzhuang (Chinese character) -P20min, and inquires a preset data table according to the first density difference value delta P1 20 and the second density difference value delta P2 20 to obtain a first temperature difference delta T1 corresponding to the first density difference value delta P1 20 and a second temperature difference delta T2 corresponding to the second density difference value delta P2 20, wherein the largest one value of the first temperature difference delta T1 and the second temperature difference delta T2 is the maximum temperature difference value delta Tmax of the corresponding date; or alternatively
The intelligent control unit obtains a maximum density value P 20max and a minimum density value P 20min in a day time, further obtains P 20∑＝(P20max+P20min)/2,△PT20＝P20max-P20min, obtains a temperature difference DeltaT according to the pressure temperature characteristic of the gas with the density value P 20∑, and further obtains a maximum temperature difference DeltaTmax= DeltaT/2 or DeltaTmax= DeltaT/2*J of a corresponding date, wherein J is a preset coefficient, and the range of J is (0.85-1.15).
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, so as to complete on-line verification of the gas density relay or the gas density monitoring device; or alternatively
The intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor when the gas density relay body generates joint signal action or is switched, and converts the pressure value and the temperature value into the pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely the gas density value, so as to finish the online verification of the gas density relay or the gas density monitoring device.
Preferably, the intelligent control unit is based on an embedded algorithm and a control program of the embedded system of the microprocessor, and automatically controls the whole verification process, including all peripherals, logic and input and output.
More preferably, the intelligent control unit automatically controls the whole verification process based on embedded algorithms and control programs such as a general purpose computer, an industrial personal computer, an ARM chip, an AI chip, CPU, MCU, FPGA, PLC and the like, an industrial control main board, an embedded main control board and the like, and comprises all peripherals, logic and input and output.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface is used for completing test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or inputting analog quantity and digital quantity information.
Preferably, the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or monitoring results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.
Preferably, the intelligent control unit is further provided with a clock, and the clock is configured to periodically set the monitoring time of the gas density relay body, record the testing time or record the event time.
Preferably, the control of the intelligent control unit is controlled by on-site control and/or by background control.
Preferably, the gas density relay body includes, but is not limited to, a bi-metal strip compensated gas density relay, a gas compensated gas density relay, a bi-metal strip and a gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; a gas density relay with pointer display, a digital display type gas density relay, and a gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
Preferably, the gas density relay body includes: a housing, a base, a pressure detector, a temperature compensation element and a plurality of signal generators which are arranged in the housing; the gas density relay body outputs a contact signal through the signal generator; the pressure detector comprises a barden tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas enclosed in the shell.
Preferably, the gas density detection sensor is provided on the gas density relay body; or the gas density detection sensor is provided on the pressure adjustment mechanism.
Preferably, the gas density detection sensor includes at least one pressure sensor and at least one temperature sensor; or the gas density detection sensor adopts a gas density transmitter consisting of a pressure sensor and a temperature sensor; or the gas density detection sensor adopts a density detection sensor adopting quartz tuning fork technology.
More preferably, the pressure sensor is mounted on a gas path of the gas density relay body; the temperature sensor is arranged on the gas path or outside the gas path of the gas density relay body, or is arranged in the gas density relay body, or is arranged outside the gas density relay body.
More preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor; can be contact type or non-contact type; can be a thermal resistor and a thermocouple; can be digital as well as analog.
More preferably, the pressure sensor may also be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (such as a baron tube with an induction coil), a resistive pressure sensor (such as a baron tube with a sliding wire resistance); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.
Preferably, the on-line check contact signal sampling unit is arranged on the gas density relay body; or the on-line check joint signal sampling unit is arranged on the pressure regulating mechanism.
Preferably, the on-line checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, wherein the first connecting circuit is connected with the contact of the gas density relay body and the contact signal control loop, and the second connecting circuit is connected with the contact of the gas density relay body and the intelligent control unit;
In a non-verification state, the second connection circuit is opened, and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit, and connects the contact of the gas density relay body with the intelligent control unit.
More preferably, the first connection circuit comprises a first relay, the second connection circuit comprises a second relay, the first relay is provided with at least one normally-closed contact, the second relay is provided with at least one normally-open contact, and the normally-closed contact and the normally-open contact keep opposite switch states; the normally-closed contact is connected in series in the contact signal control loop, and the normally-open contact is connected to the contact of the gas density relay body; in a non-verification state, the normally-closed contact is closed, the normally-open contact is opened, and the gas density relay monitors the output state of the contact in real time; in the verification state, the normally-closed contact is opened, the normally-open contact is closed, and the contact of the gas density relay body is connected with the intelligent control unit through the normally-open contact.
Preferably, at least two gas density relay bodies, at least two pressure regulating mechanisms, at least two on-line checking joint signal sampling units, an intelligent control unit and a gas density detection sensor are used for completing on-line checking of the gas density relay or the gas density monitoring device; or alternatively
The gas density relay comprises at least two gas density relay bodies, at least two pressure regulating mechanisms, at least two on-line checking joint signal sampling units, at least two intelligent control units and a gas density detection sensor, and the on-line checking of the gas density relay or the gas density monitoring device is completed; or alternatively
The gas density relay comprises at least two gas density relay bodies, at least two pressure regulating mechanisms, at least two on-line checking joint signal sampling units, at least two gas density detection sensors and an intelligent control unit, and the on-line checking of the gas density relay or the gas density monitoring device is completed.
The third aspect of the application provides a method for realizing a gas density relay, which comprises the following steps:
when the pressure regulating mechanism works normally, the first pressure changing piece of the pressure regulating mechanism applies acting force to the valve, the valve is in an open state, the air inlet and the air outlet of the valve are communicated, and the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment;
the gas density relay or the gas density monitoring device is used for checking the gas density relay according to the set checking time or/and checking instructions and the gas density value condition under the condition that the gas density relay is allowed to be checked:
The intelligent control unit is used for controlling the pressure regulating mechanism, a first pressure changing piece and a second pressure changing piece of the pressure regulating mechanism are driven by the driving component to move in a first direction, so that the valve is closed, and the gas paths of the gas density relay body and the electrical equipment are blocked; before the first pressure changing piece enters the second cavity, the volume of the air chamber of the pressure regulating mechanism is rapidly increased along with the movement of the second pressure changing piece, so that the pressure of the gas density relay body communicated with the air chamber is regulated, and the gas pressure of the gas density relay body is rapidly reduced; after the first pressure change piece enters the second cavity, the air chamber volume of the pressure regulating mechanism is slowly increased along with the movement of the first pressure change piece, so that the gas density relay body generates joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit obtains the gas density value according to the pressure value and the temperature value during joint action, or directly obtains the gas density value, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay body is completed;
After all contact signal verification works are completed, the intelligent control unit controls the pressure regulating mechanism, and the first pressure changing piece and the second pressure changing piece of the pressure regulating mechanism are driven by the driving part to move in a second direction opposite to the first direction, so that the valve is opened, and the gas circuit of the gas density relay body and the gas circuit of the electrical equipment are mutually communicated.
Preferably, a method for implementing a gas density relay includes:
When the pressure regulating mechanism works normally, the first pressure changing piece of the pressure regulating mechanism applies acting force to the valve, the valve is in an open state, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay or the gas density monitoring device monitors the gas density value in the electrical equipment on line through the gas density detecting sensor and the intelligent control unit;
the gas density relay or the gas density monitoring device is used for checking the gas density relay according to the set checking time or/and checking instructions and the gas density value condition under the condition that the gas density relay is allowed to be checked:
The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay body, and the contact of the gas density relay body is connected to the intelligent control unit;
The intelligent control unit is used for controlling the pressure regulating mechanism, a first pressure changing piece and a second pressure changing piece of the pressure regulating mechanism are driven by the driving component to move in a first direction, so that the valve is closed, and the gas paths of the gas density relay body and the electrical equipment are blocked; before the first pressure change piece enters the second cavity, the volume of the air chamber of the pressure regulating mechanism is rapidly increased along with the movement of the second pressure change piece, so that the pressure of the gas density relay body communicated with the air chamber is regulated, and the gas pressure of the gas density relay body is rapidly reduced; after the first pressure change piece enters the second cavity, the air chamber volume of the pressure regulating mechanism is slowly increased along with the movement of the first pressure change piece, so that the gas density relay body generates joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit obtains the gas density value according to the pressure value and the temperature value during joint action, or directly obtains the gas density value, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay body is completed;
The intelligent control unit drives a first pressure change piece and a second pressure change piece of the pressure regulating mechanism to move in a second direction opposite to the first direction, so that the gas pressure slowly rises, the gas density relay body is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through an on-line checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is reset, or directly obtains the gas density value, the contact signal return value of the gas density relay body is detected, and the checking work of the contact signal return value of the gas density relay body is completed;
After all the contact signal checking works are completed, the first pressure changing piece of the pressure regulating mechanism is driven by the driving component to continuously move towards the second direction, so that the valve is opened, the gas paths of the gas density relay body and the electrical equipment are mutually communicated, the on-line checking contact signal sampling unit is adjusted to a working state, and the control loop of the contact signal of the gas density relay body is restored to a normal working state.
Preferably, the intelligent control unit calculates an average value P 20 Day average of the gas density value P 20 by adopting an average method on the gas density value monitored in a day time according to a preset sampling frequency, wherein the average value P 20 Day average is an accurate day density value P 20 Tianzhuang (Chinese character) ; or the intelligent control unit performs Fourier transform on the gas density value P 20 monitored in the time of day, converts the gas density value P 20 into a corresponding frequency spectrum, and filters out periodic components to obtain an accurate day density value P 20 Tianzhuang (Chinese character) .
More preferably, the intelligent control unit obtains a maximum density value P 20max and a minimum density value P 20min within a day, further obtains a first density difference Δp1 20＝P20max-P20 Tianzhuang (Chinese character) , and obtains a first temperature difference Δt1 corresponding to the first density difference Δp1 20 according to the gas pressure-temperature characteristic of the day with the density value P 20 Tianzhuang (Chinese character) ; likewise, a second density difference DeltaP 2 20＝P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference DeltaT 2 corresponding to the second density difference DeltaP 2 20 is obtained according to the pressure and temperature characteristics of the gas with the natural density value of P 20 Tianzhuang (Chinese character) ; the largest value of the first temperature difference DeltaT 1 and the second temperature difference DeltaT 2 is the maximum temperature difference DeltaTmax of the corresponding date; or alternatively
The intelligent control unit obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) in a day time, so as to obtain a first density difference delta P1 20＝P20max-P20 Tianzhuang (Chinese character) , and obtains a first temperature difference delta T1= delta P1 20/K according to a gas pressure temperature curve slope formula K= delta P/[ delta ] T with the daily density value P 20 Tianzhuang (Chinese character) ; likewise, a second density difference Δp2 20＝P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference Δt2= Δp2 20/K is obtained; the largest value of the first temperature difference DeltaT 1 and the second temperature difference DeltaT 2 is the maximum temperature difference DeltaTmax of the corresponding date; wherein DeltaP is the pressure difference on the gas pressure temperature curve with the density value of P 20 Tianzhuang (Chinese character) , deltaT is the temperature difference corresponding to the pressure difference DeltaP; or alternatively
The intelligent control unit obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) within a day time, further obtains a first density difference value delta P1 20＝P20max-P20 Tianzhuang (Chinese character) and a second density difference value delta P2 20＝P20 Tianzhuang (Chinese character) -P20min, and inquires a preset data table according to the first density difference value delta P1 20 and the second density difference value delta P2 20 to obtain a first temperature difference delta T1 corresponding to the first density difference value delta P1 20 and a second temperature difference delta T2 corresponding to the second density difference value delta P2 20, wherein the largest one value of the first temperature difference delta T1 and the second temperature difference delta T2 is the maximum temperature difference value delta Tmax of the corresponding date; or alternatively
The intelligent control unit obtains a maximum density value P 20max and a minimum density value P 20min in a day time, further obtains P 20∑＝(P20max+P20min)/2,△PT20＝P20max-P20min, obtains a temperature difference DeltaT according to the pressure temperature characteristic of the gas with the density value P 20∑, and further obtains a maximum temperature difference DeltaTmax= DeltaT/2 or DeltaTmax= DeltaT/2*J of a corresponding date, wherein J is a preset coefficient, and the range of J is (0.85-1.15).
Preferably, after the gas density relay completes verification, if an abnormality exists, an alarm can be automatically sent out and uploaded to a remote end or sent to a designated receiver.
Preferably, the implementation method further comprises: the intelligent control unit is controlled by field control and/or by background control.
Preferably, the implementation method further comprises: and displaying the gas density value and the verification result on site or displaying the gas density value and the verification result through a background.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
The application provides a gas density relay with intelligent monitoring of the whole service life and an implementation method thereof, which are used for high-voltage and medium-voltage electrical equipment. According to the application, the switch of the valve is controlled by the pressure regulating mechanism, so that the gas density relay body is communicated with the electrical equipment on the gas path in the working state, the gas density relay body safely monitors the gas density of the electrical equipment, so that the electrical equipment can safely and reliably work, the gas density relay body is not communicated with the electrical equipment on the gas path in the checking state, and the on-line checking of the gas density relay body does not influence the safe operation of the electrical equipment, and has high reliability and good sealing performance. The pressure regulating mechanism is provided with the first cavity, the second cavity and the third cavity which are different in volume and are communicated end to end in sequence, the pressure lifting of the gas density relay body can be quickly regulated through sliding the second pressure changing piece arranged in the third cavity, the pressure lifting of the gas density relay body can be slowly regulated through sliding the first pressure changing piece arranged in the first cavity and capable of entering and exiting the second cavity, namely the pressure regulating precision is controllable, so that the accurate verification of the gas density relay body is realized, the verification can be completed without the need of an overhauling personnel on site, the reliability and the efficiency of a power grid are greatly improved, and the operation and maintenance cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of the structure of a preferred embodiment of a life-wide intelligent monitoring gas density relay in an operational state;
FIG. 2 is a schematic diagram of the structure of the intelligent monitoring gas density relay in the online verification state for the life span of the preferred embodiment;
FIG. 3 is a schematic diagram of the structure of the intelligent monitoring gas density relay in the online verification state for the life span of the preferred embodiment;
FIG. 4 is a schematic view of the valve of the preferred embodiment in its normal operating condition;
FIG. 5 is a schematic view of the valve of another preferred embodiment in its normal operating condition;
FIG. 6 is a schematic diagram of the valve of another preferred embodiment in an on-line check condition;
FIG. 7 is a schematic view of the valve of another preferred embodiment in an on-line check condition;
FIG. 8 is a schematic circuit diagram of a gas density relay for intelligent monitoring of the life cycle of the preferred embodiment;
fig. 9 is a schematic structural view of the gas density relay body of the preferred embodiment.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and more obvious, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 3, a gas density relay or a gas density monitoring device for intelligent monitoring of the whole life comprises: the gas density relay comprises a gas density relay body 1, a gas density detection sensor (a pressure sensor 2 and a temperature sensor 3), a valve 4, a pressure regulating mechanism 5, an on-line check joint signal sampling unit 6 and an intelligent control unit 7. The gas density relay body 1 is arranged on a first interface 506 of the pressure regulating mechanism 5, the gas inlet of the valve 4 is communicated with a gas path of the electrical equipment 8, and the gas outlet of the valve 4 is arranged on a second interface 507 of the pressure regulating mechanism 5; the pressure sensor 2, the temperature sensor 3, the on-line checking joint signal sampling unit 6 and the intelligent control unit 7 are arranged on the gas density relay body 1. The pressure sensor 2, the temperature sensor 3 and the pressure regulating mechanism 5 are respectively connected with the intelligent control unit 7, and the on-line checking joint signal sampling unit 6 is respectively connected with the gas density relay body 1 and the intelligent control unit 7. Wherein the valve 4 and the pressure regulating mechanism 5 are an assembly. The valve 4 is closed or opened under the control of the pressure regulating mechanism 5, and meanwhile, the pressure regulating mechanism 5 regulates the pressure rise and fall of the gas density relay body 1 communicated with the gas circuit, so that the gas density relay body 1 generates alarm and/or unlocking contact signal actions.
Fig. 1 is a schematic diagram of an operating state structure of a gas density relay or a gas density monitoring device, and fig. 2 and 3 are schematic diagrams of a verification state structure of the gas density relay or the gas density monitoring device.
The implementation process of the pressure regulating mechanism 5 specifically comprises: the first cavity 501, the second cavity 501A and the third cavity 501B are sequentially communicated from head to tail, and an opening is formed in one end, far away from the second cavity 501A, of the third cavity 501B; the cross-sectional specifications of the first cavity 501 and the third cavity 501B are larger than the cross-sectional specifications of the second cavity 501A. A first interface 506 communicated with the gas path of the gas density relay body 1 is arranged on the side wall of the first cavity 501, and a connecting pipe for connecting the gas density relay body 1 can be arranged on the first interface 506; the side wall of the first cavity 501 is further provided with a second interface 507 communicated with the air outlet of the valve 4, and the relative positions of the first interface 506 and the second interface 507 are staggered. A first pressure changing piece 502A (in this embodiment, a piston) opposite to the valve core of the valve 4 is slidably disposed in the first cavity 501 and the second cavity 501A, and after the first pressure changing piece 502A enters the second cavity 501A, it is in sealing contact with the inner wall of the second cavity 501A. In a preferred embodiment, the first pressure changing member 502A is provided with a sealing member 503A (a rubber ring in this embodiment), and the first pressure changing member 502A is in sealing contact with the inner wall of the second cavity 501A through the sealing member 503A. The first pressure changing member 502A is connected to a second pressure changing member 502B (in this embodiment, a piston) through a first connecting member 504A, and the second pressure changing member 502B is slidably disposed in the third cavity 501B and is in sealing contact with an inner wall of the third cavity 501B. In a preferred embodiment, a sealing member 503B (in this embodiment, a rubber ring) is disposed on the second pressure changing member 502B, and the second pressure changing member 502B is in sealing contact with the inner wall of the third cavity 501B through the sealing member 503B. The second pressure changing member 502B is connected to one end of the second connecting member 504B, and the other end of the second connecting member 504B extends from the opening of the third cavity 501B and is connected to the driving member 505. The driving component 505 drives the second connecting piece 504B to further drive the second pressure changing piece 502B to move in the third cavity 501B, and the second pressure changing piece 502B drives the first connecting piece 504A to further drive the first pressure changing piece 502A to move in the first cavity 501 and the second cavity 501A, so as to control the valve core to move in the valve body along the direction of the air inlet and the air outlet; the gas pressure in the pressure adjustment mechanism 5 changes with the position change of the first pressure changing member 502A and the second pressure changing member 502B. The driving part 505 may be one of a magnetic force, a motor, an electric push rod motor, a stepping motor, a reciprocating mechanism, a Carnot circulation mechanism, an air compressor, a bleed valve, a pressure-making pump, a booster valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust generation mechanism, an electric heating thrust generation mechanism, and a chemical reaction thrust generation mechanism. Heating produces a thrust mechanism, such as a heated bimetallic strip, which produces a thrust force.
In a preferred embodiment, the pressure regulating mechanism 5 further comprises a sealing coupling 508, one end of the sealing coupling 508 is in sealing connection with the opening of the third cavity 501B, the other end of the sealing coupling 508 is in sealing connection with the driving end of the driving member 505, or the sealing coupling 508 seals the second connecting member 504B and the driving member 505 within the sealing coupling 508. The sealing coupling 508 may be a bellows, or a sealing bladder, or a sealing ring, and in this embodiment, the sealing coupling 508 is a bellows.
The valve 4 comprises a valve body and a valve core assembly arranged in the valve body, the valve body is of a middle through structure, and two ends of the middle through structure are provided with an air inlet connected with the electrical equipment 8 and an air outlet communicated with an air passage of the pressure regulating mechanism 5; the valve core assembly comprises an elastic piece and a valve core for blocking the air outlet, one end of the valve core penetrates through the air outlet and stretches into the first cavity 501 of the pressure regulating mechanism 5, the other end of the valve core is fixedly connected with one end of the elastic piece, and the other end of the elastic piece is fixed at the air inlet.
In particular, fig. 4 to 7 present schematic structural views of several preferred embodiments of the valve 4.
Referring to fig. 4, in a preferred embodiment, the valve 4 includes a valve body 404 and a spool assembly disposed within the valve body 404. The inner wall of the valve body 404 is provided with a funnel-shaped inclined plane, and two ends of the valve body 404 are provided with an air inlet 4B connected with the electrical equipment 8 and an air outlet 4A communicated with an air passage of the pressure regulating mechanism 5. The valve core assembly comprises a return spring 403 and a valve core, the valve core comprises a sealing ball 4011 and a push rod 4012, one end of the push rod 4012 is fixedly connected with the sealing ball 4011, and the other end of the push rod 4012 extends out of the air outlet 4A. A gap is reserved between the part of the ejector rod 4012 penetrating through the air outlet 4A and the inner wall of the air outlet 4A. The air inlet 4B of the valve 4 is further provided with a fixing member 408, the return spring 403 is sandwiched between the sealing ball 4011 and the fixing member 408, and the fixing member 408 is provided with a through hole 409 through which air passes.
In a normal working state, the first pressure changing element 502A of the pressure adjusting mechanism 5 pushes the sealing ball 4011 and the ejector rod 4012 to move in the cavity of the valve body 404 toward the direction of the air inlet 4B, the return spring 403 is in a compressed state, the outer edge surface of the sealing ball 4011 is separated from the inclined surface of the inner wall of the valve body 404, and the air inlet 4B and the air outlet 4A of the valve 4 are communicated, i.e. the valve 4 is in an open state. When the gas density relay body 1 is checked, the outer edge surface of the sealing ball 4011 is tightly attached to the inclined surface of the inner wall of the valve body 404, so as to seal the gas outlet 4A of the valve 4, that is, the valve 4 is in a closed state, and the gas path between the gas inlet 4B of the valve 4 and the first interface 506 of the pressure regulating mechanism 5 is blocked.
Referring to fig. 5, in another preferred embodiment, the valve body 404 is a rectangular cavity, and two ends of the valve body 404 are provided with an air inlet 4B connected to an electrical device and an air outlet 4A connected to an air path of the pressure adjusting mechanism 5. The valve core of the valve 4 comprises a sealing ball 4011 and a T-shaped ejector rod 4012, the end part of a long section of the ejector rod 4012 penetrates through the air outlet 4A and then extends into the first cavity 501, and one side, back to the long section, of a short section of the ejector rod 4012 is fixedly connected with one end of the sealing ball 4011. The short section may be a sealing disc, where the area of the sealing disc is larger than that of the air outlet 4A, so as to seal the air outlet 4A. The reciprocating movement of the first pressure changing member 502A may cause intermittent collision between the sealing disc and the end face of the air outlet 4A facing the inside of the valve body 404, and the working face of the sealing disc for sealing the air outlet 4A may be locally damaged, i.e., the sealing performance may be reduced. In a preferred embodiment, a rubber gasket 4013 may be disposed on the working surface of the sealing disc for sealing the air outlet 4A, and before the sealing disc performs intermittent reciprocating motion to contact with the end surface of the air outlet 4A facing the inside of the valve body 404, the gasket 4013 on the sealing disc is in flexible contact with the inner wall of the valve body 404, so that the tendency of the sealing disc to move rightwards is relatively slowed down, until after the working surface of the sealing disc contacts with the air outlet 4A, the sealing ball 4011 forms a certain extrusion on the sealing disc under the action of the restoring force of the restoring spring 403, and the gasket 4013 fastens the sealing disc on the inner wall of the valve body 404 through deformation, thereby enhancing the sealing performance of the sealing disc on the air outlet 4A.
Referring to fig. 6, in another preferred embodiment, the valve body 404 is a rectangular cavity, and two ends of the valve body 404 are provided with an air inlet 4B connected to an electrical device and an air outlet 4A connected to an air path of the pressure adjusting mechanism 5. The valve core comprises a sealing ball 4011 and a push rod 4012, one end of the push rod 4012 is fixedly connected with the sealing ball 4011, and the other end of the push rod 4012 extends out of the air outlet 4A. The inner diameter of the air outlet 4A of the valve 4 decreases progressively from the inside of the valve body 404 to the first cavity 501 along the axis of the ejector rod 4012, and the outer edge surface of the sealing ball 4011 is in sealing fit with the inclined surface of the air outlet 4A to seal the air outlet 4A of the valve 4. The inclined surface of the air outlet 4A is provided to facilitate improvement of the sealing property. In a preferred embodiment, a gasket 4014 made of elastic rubber is further disposed on the inner wall of the valve body 404 where the air outlet 4A is located, a sealing hole coaxial with the air outlet 4A is formed in the middle of the gasket 4014, and the inner diameter of the sealing hole is smaller than the diameter of the sealing ball 4011. That is, before the sealing ball 4011 performs intermittent reciprocating motion and contacts with the end surface of the air outlet 4A facing the inside of the valve body 404, the sealing ball 4011 is in flexible contact with the gasket 4014, so that the movement trend of the sealing ball 4011 to the right is relatively slowed down, until the inner diameter of the sealing ball 4011 is larger than the inner diameter of the sealing hole after the working surface of the sealing ball 4011 contacts with the air outlet 4A, so that the outer wall of the sealing ball 4011 can form certain extrusion on the inner wall of the sealing hole, the gasket 4014 clamps and fastens the sealing ball 4011 through deformation, and the sealing performance of the sealing ball 4011 on the air outlet 4A is further enhanced.
Referring to fig. 7, in another preferred embodiment, the valve 4 may be a self-sealing valve as in the prior art. Specifically, the valve core 401 includes a valve rod and a valve clack, and the valve clack is fixed on the valve rod; the inner wall of the valve body 404 is provided with a funnel-shaped inclined surface. In a normal working state, the first pressure changing part 502A of the pressure adjusting mechanism 5 pushes the valve core 401 to move in the cavity of the valve body 404 toward the direction of the air inlet 4B, the return spring 403 is in a compressed state, the outer edge surface of the valve clack of the valve core 401 is separated from the inclined surface of the inner wall of the valve body 404, and the air inlet 4B and the air outlet 4A of the valve 4 are communicated, i.e. the valve 4 is in an open state. When the gas density relay body 1 is checked, the outer edge surface of the valve clack is sealed and attached to the inclined surface of the inner wall of the valve body 404 through the sealing ring 402, so that the gas outlet 4A of the valve 4 is blocked, namely, the valve 4 is in a closing state. The valve body 404 may further be provided with a sealing member 407A sealingly connected to the pressure adjusting mechanism 5, and a sealing member 407B sealingly connected to the electrical apparatus, where the sealing member is any one of a rubber ring, a rubber pad, or an O-ring.
In the above embodiment, the spool, the return spring 403, the first connecting member 504A, and the second connecting member 504B are located on the same axis.
The structure of the valve 4 is not limited to the above-described embodiments, and any valve that can realize the on-off function of the valve 4 in the present application may be used in the prior art.
The gas density relay body 1 includes: a bimetal-compensated gas density relay, a gas-compensated gas density relay, or a bimetal and gas-compensated mixed gas density relay; a fully mechanical gas density relay, a digital gas density relay, a combination of mechanical and digital gas density relay; density relay with indication (density relay with pointer display, or density relay with digital display, density relay with liquid crystal display), density relay without indication (i.e. density switch); SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay, other gas density relay, and the like.
The type of pressure sensor 2 described above: the pressure sensor can be an absolute pressure sensor, a relative pressure sensor or an absolute pressure sensor and a relative pressure sensor, and the number can be a plurality. The pressure sensor 2 can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip type pressure sensor, a coil induction pressure sensor (such as a pressure measurement sensor with an induction coil of a Bardon tube), a resistance pressure sensor (such as a pressure measurement sensor with a slide wire resistance of the Bardon tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure acquisition is a pressure sensor, a pressure transducer, or other various pressure sensing elements, such as diffused silicon, sapphire, piezoelectric, strain gauge (resistive strain gauge, ceramic strain gauge).
The temperature sensor 3 may be a thermocouple, a thermistor, or a semiconductor; can be contact type or non-contact type; and may be a thermal resistor and a thermocouple. In short, various temperature sensing elements such as a temperature sensor and a temperature transmitter can be used for temperature acquisition.
The intelligent control unit 7 (shown in fig. 8) includes a processor 71 (U1) and a power supply 72 (U2). The processor 71 (U1) may be a general purpose computer, an industrial personal computer, a CPU, a single chip microcomputer, an ARM chip, an AI chip, MCU, FPGA, PLC, etc., an industrial motherboard, an embedded main control board, etc., and other intelligent integrated circuits. The power source 72 (U2) may be a switching power source, an ac 220V, a dc power source, an LDO, a programmable power source, solar energy, a secondary battery, a rechargeable battery, a battery, an electric field induction power source, a magnetic field induction power source, a wireless charging power source, a capacitive power source, or the like.
The basic requirements or functions of the intelligent control unit 7 are: in the working state, the intelligent control unit 7 acquires the gas density value acquired by the gas density detection sensor; or the intelligent control unit 7 acquires the pressure value and the temperature value acquired by the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3) to complete the on-line monitoring of the gas density of the monitored electrical equipment by the gas density relay without manually reading the display value of the gas density relay body on site. During verification, the intelligent control unit 7 is used for completing control and signal acquisition of the pressure regulating mechanism 5, closing of the valve 4 is achieved, then the gas paths of the gas density relay body 1 and the electrical equipment 8 are cut off during verification, the pressure value and the temperature value of the gas density relay body 1 when the contact signal acts can be detected, the corresponding pressure value P 20 (density value) at 20 ℃ can be converted, namely the contact action value P D20 of the gas density relay body 1 can be detected, and verification work of the gas density relay body 1 is completed. Or the intelligent control unit 7 can directly detect the density value P D20 when the contact signal of the gas density relay body 1 acts, and the verification work of the gas density relay body 1 is completed. Meanwhile, the intelligent control unit 7 can also complete self-checking among the gas density relay body 1, the pressure sensor 2 and the temperature sensor 3 through testing the rated pressure value of the gas density relay body 1, so that maintenance-free performance is realized.
Specifically, when monitoring the gas density relay body 1, the intelligent control unit 7 may calculate, according to a preset sampling frequency, an average value P 20 Day average of the gas density value P 20 by using an average method on the gas density value monitored in a time of day, where the average value P 20 Day average is an accurate day density value P 20 Tianzhuang (Chinese character) ; or the intelligent control unit performs Fourier transform on the gas density value P 20 monitored in the time of day, converts the gas density value P 20 into a corresponding frequency spectrum, and filters out periodic components to obtain an accurate day density value P 20 Tianzhuang (Chinese character) . In addition, the intelligent control unit 7 may obtain a maximum density value P 20max and a minimum density value P 20min within a day, further obtain a first density difference Δp1 20＝P20max-P20 Tianzhuang (Chinese character) , and obtain a first temperature difference Δt1 corresponding to the first density difference Δp1 20 according to the gas pressure-temperature characteristic of the day with the density value P 20 Tianzhuang (Chinese character) ; likewise, a second density difference DeltaP 2 20＝P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference DeltaT 2 corresponding to the second density difference DeltaP 2 20 is obtained according to the pressure and temperature characteristics of the gas with the natural density value of P 20 Tianzhuang (Chinese character) ; the largest one of the first temperature difference Δt1 and the second temperature difference Δt2 is the maximum temperature difference Δtmax of the corresponding date. Or the intelligent control unit 7 obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) within a day, so as to obtain a first density difference value Δp1 20＝P20max-P20 Tianzhuang (Chinese character) , and obtains a first temperature difference value Δt1= Δp1 20/K according to a gas pressure temperature curve slope formula k= Δp/. DELTA.t with a daily density value P 20 Tianzhuang (Chinese character) ; likewise, a second density difference Δp2 20＝P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference Δt2= Δp2 20/K is obtained; the largest one of the first temperature difference Δt1 and the second temperature difference Δt2 is the maximum temperature difference Δtmax of the corresponding date. Or the intelligent control unit 7 obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) within a day, further obtains a first density difference Δp1 20＝P20max-P20 Tianzhuang (Chinese character) and a second density difference Δp2 20＝P20 Tianzhuang (Chinese character) -P20min, and queries a preset data table according to the first density difference Δp1 20 and the second density difference Δp2 20 to obtain a first temperature difference Δt1 corresponding to the first density difference Δp1 20 and a second temperature difference Δt2 corresponding to the second density difference Δp2 20, where the largest one of the first temperature difference Δt1 and the second temperature difference Δt2 is the maximum temperature difference Δtmax of the corresponding date. Or the intelligent control unit 7 obtains a maximum density value P 20max and a minimum density value P 20min within a day time, so as to obtain P 20∑＝(P20max+P20min)/2,△PT20＝P20max-P20min, and obtains a temperature difference Δt according to the gas pressure temperature characteristic of the density value P 20∑, so as to obtain a maximum temperature difference Δtmax= Δt/2 or Δtmax= Δt/2*J of a corresponding date, wherein J is a preset coefficient, and the range of J is (0.85-1.15).
The above-mentioned on-line checking contact signal sampling unit 6 mainly completes the contact signal sampling of the gas density relay body 1. Namely, the basic requirements or functions of the on-line check contact signal sampling unit 6 are: 1) The safety operation of the electrical equipment is not affected during the verification, namely, the safety operation of the electrical equipment is not affected when the contact signal of the gas density relay body 1 acts during the verification; 2) The contact signal control loop of the gas density relay body 1 does not affect the performance of the gas density relay, particularly the performance of the intelligent control unit 7, and the gas density relay is not damaged or the testing work is not affected. Specifically, as shown in fig. 8, the on-line checking contact signal sampling unit 6 includes a first connection circuit and a second connection circuit, the first connection circuit is connected to the contact P J of the gas density relay body 1 and the control loop of the contact signal, and the second connection circuit is connected to the contact P J of the gas density relay body 1 and the intelligent control unit 7. In a non-verification state, the second connection circuit is opened, and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit 6 cuts off the first connection circuit, communicates with the second connection circuit, and connects the contact P J of the gas density relay body 1 with the intelligent control unit 7.
The gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5, the on-line checking joint signal sampling unit 6, the intelligent control unit 7 and/or the multi-way joint can be flexibly arranged according to the needs. For example, the gas density relay body 1, the pressure sensor 2, and the temperature sensor 3 may be provided together; or the pressure sensor 2 and the pressure adjusting mechanism 5 may be provided together. In short, the arrangement between them can be flexibly arranged and combined.
Fig. 9 is a schematic view of the structure of a gas density relay body 1 according to a preferred embodiment of the present application. As shown in fig. 9, a gas density relay body 1 includes: a housing 101, a base 102, an end seat 108, a pressure detector 103, a temperature compensation element 104, a plurality of signal generators 109, a movement 105, a pointer 106, and a dial 107 provided in the housing 101. One end of the pressure detector 103 is fixed on the base 102 and is communicated with the base, the other end of the pressure detector 103 is connected with one end of the temperature compensation element 104 through the end seat 108, the other end of the temperature compensation element 104 is provided with a cross beam, and the cross beam is provided with an adjusting piece for pushing the signal generator 109 and enabling the contact of the signal generator 109 to be connected or disconnected. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is also connected with the movement 105 through a connecting rod or directly connected with the movement 105; the pointer 106 is mounted on the movement 105 and is provided in front of the dial 107, and the pointer 106 displays the gas density value in conjunction with the dial 107. The gas density relay body 1 may also include a digital device or a liquid crystal device with an indication display. The signal generator 109 includes a micro switch or a magnetically assisted electrical contact, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detector 103 comprises a barden tube or a bellows; the temperature compensation element 104 employs a temperature compensation plate or a gas enclosed within a housing. The gas density relay body 1 of the present embodiment may further include: oil-filled type density relay, oil-free type density relay, gas density gauge, gas density switch or gas pressure gauge.
In the gas density relay body 1 of the present embodiment, the principle is to correct the changing pressure and temperature based on the pressure detector 103 by using the temperature compensation element 104 to reflect the change of the sulfur hexafluoride gas density. Under the pressure of sulfur hexafluoride (SF 6) gas as a medium to be measured, the temperature compensation element 104 is used, when the sulfur hexafluoride gas density value is changed, the sulfur hexafluoride gas pressure value is correspondingly changed, the tail end of the pressure detector 103 is forced to generate corresponding elastic deformation displacement, the elastic deformation displacement is transmitted to the movement 105 by the aid of the temperature compensation element 104, the movement 105 is transmitted to the pointer 106 again, and then the measured sulfur hexafluoride gas density value is indicated on the dial 107. The signal generator 109 acts as an output alarm lockout contact. Thus, the gas density relay body 1 can display the sulfur hexafluoride gas density value. If the gas leaks, the density value of sulfur hexafluoride gas is reduced, the pressure detector 103 generates corresponding downward displacement, the downward displacement is transmitted to the movement 105 through the temperature compensation element 104, the movement 105 is transmitted to the pointer 106 again, the pointer 106 moves towards the direction with small indication value, and the gas leakage degree is specifically displayed on the dial 107; meanwhile, the pressure detector 103 drives the cross beam to move downwards through the temperature compensation element 104, the adjusting piece on the cross beam is gradually separated from the signal generator 109, and when the contact of the signal generator 109 is connected to a certain extent, a corresponding contact signal (alarm or locking) is sent out, so that the purpose of monitoring and controlling the sulfur hexafluoride gas density in the electrical equipment is achieved, and the electrical equipment can work safely. If the gas density value increases, that is, the sulfur hexafluoride gas pressure value in the sealed gas chamber is greater than the set sulfur hexafluoride gas pressure value, the pressure value correspondingly increases, the end of the pressure detector 103 and the temperature compensation element 104 correspondingly displace upwards, the temperature compensation element 104 also displaces the cross beam upwards, the adjusting element on the cross beam displaces upwards and pushes the contact of the signal generator 109 to be disconnected, and the contact signal (alarm or locking) is released.
Taking the valve 4 in fig. 4 as an example, with reference to fig. 1 to 3, the working principle of the gas density relay or the gas density monitoring device for intelligent monitoring of the whole life is as follows:
As shown in fig. 1, in the working state, the intelligent control unit 7 obtains a corresponding pressure value P 20 at 20 ℃ according to the gas pressure and temperature of the electrical equipment 8 monitored by the pressure sensor 2 and the temperature sensor 3 (i.e. a gas density value, i.e. an online monitored gas density value). The first pressure changing piece 502A of the pressure regulating mechanism 5 pushes the valve core, namely, pushes the sealing ball 4011 and the ejector rod 4012 to move in the cavity of the valve body 404 towards the direction of the air inlet 4B, the reset spring 403 is in a compressed state, the outer edge surface of the sealing ball 4011 is separated from the inclined surface of the inner wall of the valve body 404, the air inlet 4B and the air outlet 4A of the valve 4 are communicated, namely, the valve 4 is in an open state, the first cavity 501 of the pressure regulating mechanism 5 is communicated with the air circuit of the air density relay body 1 and the electric equipment 8, the air density relay body 1 is communicated with the electric equipment 8 on the air circuit in the working state, and the air density relay body 1 safely monitors the air density of the electric equipment 8, so that the electric equipment 8 safely and reliably works.
When the gas density relay body 1 needs to be checked, if the gas density value P 20 is greater than or equal to the set safety check density value P S, the gas density relay (or the density monitoring device) sends a command, that is, the driving component 505 of the pressure regulating mechanism 5 is driven by the intelligent control unit 7, the driving component 505 drives the second connecting piece 504B to move rightward, so that the second pressure changing piece 502B and the first pressure changing piece 502A move rightward (away from the direction of the valve 4). As shown in fig. 2, the first pressure changing part 502A is far away from the ejector rod of the valve 4, the sealing ball moves rightward under the action of the restoring force of the restoring spring, the outer edge surface of the sealing ball is in sealing fit on the inclined surface of the inner wall of the valve body, the air outlet 4A of the valve 4 is blocked, the air path is automatically closed, the air path of the gas density relay body 1 and the air path of the electrical equipment 8 are further closed, meanwhile, the on-line checking contact signal sampling unit 6 cuts off a control loop of a contact signal of the gas density relay body 1, and the contact of the gas density relay body 1 is connected to the intelligent control unit 7. Because the gas density relay has been monitored and judged for the safety check density value P S set at a value of the gas density value P 20 > before the start of the check, the gas of the electrical equipment 8 is in the safe operating range, moreover, the gas leakage is a slow process, and the check is safe.
Before the first pressure changing element 502A and the sealing element 503A move rightward to the second cavity 501A, the second pressure changing element 502B encloses a sealed air chamber with the inner wall of the first cavity 501, the inner wall of the second cavity 501A, and the inner wall of the third cavity 501B. With the movement of the second pressure changing member 502B and the sealing member 503B in the third cavity 501B, the volume of the sealed air chamber is greatly changed, and the pressure of the gas density relay body 1 communicated with the first cavity 501 can be quickly adjusted, so that the gas pressure can be obviously reduced.
When the gas pressure value of the gas density relay body 1 approaches the contact action value of the gas density relay, as shown in fig. 3, at this time, the first pressure changing member 502A and the sealing member 503A move rightward into the second cavity 501A, and the first pressure changing member 502A is in sealing contact with the inner wall of the second cavity 501A through the sealing member 503A, and the first pressure changing member 502A encloses a sealed air chamber with the inner walls of the first cavity 501 and the second cavity 501A. Along with the movement of the first pressure changing element 502A and the sealing element 503A in the second cavity 501A, the volume of the sealed air chamber is changed slightly, so that the pressure of the gas density relay body 1 can be regulated slowly, the gas pressure of the gas density relay body is reduced slowly, the gas density relay body 1 is enabled to perform a contact action, the contact action is transmitted to the intelligent control unit 7 through the online checking contact signal sampling unit 6, the intelligent control unit 7 further calculates to obtain the gas density value P 20 according to the pressure value P acquired by the pressure sensor 2 and the temperature value T acquired by the temperature sensor 3 during the contact action, or directly obtains the gas density value P 20, and the checking work of the contact signal action value of the gas density relay body 1 is completed by detecting the contact signal action value P D20 of the gas density relay body 1.
After the contact action values of the alarm and/or locking signals of the gas density relay body 1 are detected completely, the intelligent control unit 7 controls the driving part 505 of the pressure regulating mechanism 5, the driving part 505 drives the second pressure changing part 502B of the pressure regulating mechanism 5 to move leftwards (namely to move towards the valve 4), the volume of the sealed air chamber changes, the pressure of the gas density relay body 1 can be regulated, the gas pressure of the gas density relay body 1 can be slowly increased, the gas density relay body 1 is enabled to generate contact reset, the contact reset is transmitted to the intelligent control unit 7 through the on-line checking contact signal sampling unit 6, the intelligent control unit 7 obtains a gas density value P 20 according to the pressure value P and the temperature value T when the contact is reset, or directly obtains a gas density value P 20, and the checking work of the contact signal return value P F20 of the gas density relay body 1 is completed. The gas density relay body 1 can be repeatedly checked for a plurality of times (for example, 2-3 times), and then the average value is calculated, so that the online checking work of the gas density relay body 1 is conveniently completed, and meanwhile, when the gas density relay body 1 is checked online, the gas density relay body 1 is not communicated with electrical equipment on a gas path, and the safe operation of the electrical equipment is not affected.
After all the contact signal checking operations are completed, the first pressure changing piece 502A of the pressure adjusting mechanism 5 continues to move leftwards under the action of the driving component 505, and applies an acting force to the sealing ball and the ejector rod of the valve 4, so that the valve 4 is opened, and the electrical equipment 8 and the gas circuit of the gas density relay body 1 are mutually communicated. As shown in fig. 1: at this time, the valve 4 is opened, the gas density relay body 1 is communicated with the electrical equipment 8 on the gas path, the gas density relay body 1 normally monitors the gas density of the gas chamber of the electrical equipment 8, and the gas density of the electrical equipment 8 can be monitored on line. That is, the density monitoring circuit of the gas density relay works normally, and the gas density relay monitors the gas density of the electrical equipment 8 safely, so that the electrical equipment 8 works safely and reliably.
After the gas density relay body 1 completes the verification work, the gas density relay or the gas density monitoring device judges, and the detection result can be reported in a flexible way. In a word, after the gas density relay finishes the online checking work, if the gas density relay is abnormal, an alarm can be automatically sent out and can be uploaded to a far end.
It should be noted that, the gas density relay in the present application generally refers to a structure in which constituent elements thereof are designed as a whole; the gas density monitoring device generally refers to the design of the constituent elements into a separate structure and flexible composition.
In summary, the gas density relay body is ensured to be communicated with the electrical equipment on the gas path through the switch of the pressure regulating mechanism control valve in the working state, the gas density relay body safely monitors the gas density of the electrical equipment, so that the electrical equipment can safely and reliably work, and in the verification state, the gas density relay body is not communicated with the electrical equipment on the gas path, and the on-line verification of the gas density relay body does not influence the safe operation of the electrical equipment, and has high reliability and good sealing performance. According to the application, the first cavity, the second cavity and the third cavity which are different in volume and are communicated end to end in sequence are arranged, the pressure lifting of the gas density relay body can be quickly regulated through the second pressure changing piece which is arranged in the third cavity in a sliding manner, and the pressure lifting of the gas density relay body can be slowly regulated through the first pressure changing piece which is arranged in the first cavity and can enter and exit the second cavity, namely, the pressure regulating precision is controllable, so that the accurate verification of the gas density relay body is realized. In the technical scheme of the application, before the rated pressure of the density relay reaches the action of the alarm contact, the pressure adjustment can be carried out in a rapid pressure adjustment mode, so that the time is greatly saved, and when the pressure is near the action contact of the alarm contact, the pressure adjustment is carried out in a slow pressure adjustment mode, so that the speed of the pressure adjustment is slow, the detection precision is fully ensured, and the application has the outstanding advantages that: 1) The time for checking the density relay on line is greatly saved; 2) The detection precision of the on-line check density relay is greatly improved; 3) The control speed requirement of the intelligent control unit on the driving part is greatly reduced, so that the intelligent control unit is simple to control and is more reliable.
The gas density relay or the gas density monitoring device can be various types of check valves, and the technology can utilize the existing check valves in electrical equipment to carry out targeted technical improvement. In the transformer substation, the existing check valve in the electrical equipment is utilized, and the technology provided by the invention is adopted to carry out targeted technical transformation, so that the on-line check density relay is realized. In addition, the valve may be designed directly in one piece with the pressure regulating mechanism. Also, one end of the valve core of the valve may not extend through the air outlet and into the air chamber of the pressure regulating mechanism; the valve clack and the valve rod of the valve core can be integrally designed. The pressure regulating mechanism may be sealed within a cavity. In the invention, the design of the first cavity and the second cavity can be further optimized, specifically: the first cavity and the second cavity are integrated, and a notch or an outer diameter of one side of the first pressure change piece, which is close to the second interface, is small, so that the first pressure change piece can not block the communication between the first interface and the second interface, namely, the first interface and the second interface are reliably communicated. The first pressure changing piece is in sealing contact with the inner wall of the second cavity after entering the second cavity, and besides the sealing by the sealing piece (sealing ring), the sealing contact can be performed by adopting a magnetic fluid sealing technology. And the second pressure change piece is in sealing contact with the inner wall of the third cavity after entering the third cavity, and can also be in sealing contact by adopting a magnetic fluid sealing technology. The relative positions of the first interface and the second interface are staggered, which can be generally referred to as: the first pressure change member is not at both interfaces (i.e., the first interface and the second interface) at the same time. The gas density relay can also be technically improved and upgraded by utilizing the original gas density relay of the transformer substation.
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.
Claims (29)
1. A gas density relay of intelligent control of life-span, its characterized in that includes: the intelligent control device comprises a gas density relay body, a gas density detection sensor, a valve, a pressure regulating mechanism for controlling a valve switch, an on-line check joint signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the gas density relay body;
the valve is provided with an air inlet connected with the electrical equipment and an air outlet communicated with an air passage of the pressure regulating mechanism;
The pressure regulating mechanism comprises a first cavity, a second cavity and a third cavity which are communicated end to end in sequence, and one end of the third cavity, which is far away from the second cavity, is provided with an opening; the section specifications of the first cavity and the third cavity are larger than the section specifications of the second cavity; the side wall of the first cavity is provided with a first interface communicated with the gas path of the gas density relay body and a second interface communicated with the gas outlet of the valve, and the relative positions of the first interface and the second interface are staggered; the first cavity is internally provided with a first pressure change piece in a sliding manner, the first pressure change piece can movably enter and exit the second cavity, and the first pressure change piece is in sealing contact with the inner wall of the second cavity after entering the second cavity; the first pressure changing piece is connected with the second pressure changing piece through the first connecting piece, and the second pressure changing piece is arranged in the third cavity in a sliding manner and is in sealing contact with the inner wall of the third cavity; the second pressure change piece is connected with one end of a second connecting piece, and the other end of the second connecting piece extends out of the opening and then is connected with the driving part; the driving part drives the second connecting piece to drive the second pressure changing piece to move in the third cavity, and the second pressure changing piece drives the first connecting piece to drive the first pressure changing piece to move in the first cavity and the second cavity so as to control the opening and closing of the valve; the gas pressure in the pressure regulating mechanism changes along with the position changes of the first pressure changing piece and the second pressure changing piece, and is used for regulating the pressure rise and fall of the gas density relay body so as to enable the gas density relay body to generate contact signal actions;
The on-line checking contact signal sampling unit is connected with the gas density relay body and is configured to sample contact signals of the gas density relay body;
The intelligent control unit is respectively connected with the pressure regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit and is configured to complete control of the pressure regulating mechanism, pressure value acquisition and temperature value acquisition and/or gas density value acquisition and detect a joint signal action value and/or a joint signal return value of the gas density relay body;
Wherein the contact signal includes an alarm, and/or a latch.
2. The gas density relay of claim 1, wherein: the valve comprises a valve body, an elastic piece and a valve core for blocking the air outlet; the valve body is of a middle-through structure, and the air inlet and the air outlet are arranged at two ends of the middle-through structure; the valve core is arranged in the middle through structure in a sliding way, one end of the valve core penetrates through the air outlet and extends into the first cavity of the pressure regulating mechanism partially, and a gap is reserved between the part of the valve core penetrating through the air outlet and the inner wall of the air outlet; the other end of the valve core is fixedly connected with one end of the elastic piece, and the other end of the elastic piece is fixed at the air inlet; the valve core has a first position and a second position that move in an axial direction of the valve body; when the valve core is positioned at the first position, the air outlet is blocked; when the valve core is positioned at the second position, the air inlet and the air outlet are communicated.
3. The gas density relay of claim 2, wherein: the valve core, the elastic piece, the first connecting piece and the second connecting piece are positioned on the same axis.
4. The gas density relay of claim 2, wherein: the elastic piece is a return spring.
5. The gas density relay of claim 2, wherein: the valve core comprises a valve rod and a valve clack, the valve clack is fixed on the valve rod, and one end of the valve rod penetrates through the air outlet and extends into the first cavity of the pressure regulating mechanism partially; the inner wall of the valve body is provided with a funnel-shaped inclined plane, the outer edge surface of the valve clack is in sealing fit with the inclined plane of the inner wall of the valve body, and the air outlet is blocked.
6. The gas density relay of claim 2, wherein: the valve core comprises a sealing ball and a push rod, and one end of the push rod penetrates through the air outlet and extends into the first cavity of the pressure regulating mechanism partially; the other end of the ejector rod is fixedly connected with one end of the sealing ball, and the other end of the sealing ball is fixedly connected with the elastic piece.
7. The gas density relay of claim 6, wherein: the inner wall of the valve body is provided with a funnel-shaped inclined surface, the outer edge surface of the sealing ball is in sealing fit with the inclined surface of the inner wall of the valve body, and the air outlet is blocked.
8. The gas density relay of claim 6, wherein: the ejector rod is T-shaped, the end part of the long section of the ejector rod penetrates through the air outlet and partially extends into the first cavity of the pressure regulating mechanism, and one side of the short section of the ejector rod, which is opposite to the long section, is fixedly connected with one end of the sealing ball.
9. The gas density relay of claim 6, wherein: the inner diameter of the air outlet is gradually reduced from the inside of the valve body to the first cavity of the pressure regulating mechanism along the axis of the ejector rod, the outer edge surface of the sealing ball is in sealing fit with the inclined surface of the air outlet, and the air outlet is blocked.
10. The gas density relay of claim 1, wherein: the driving part comprises one of a magnetic force, a motor, a reciprocating mechanism, a Carnot circulation mechanism, an air compressor, a deflation valve, a pressure pump, a booster valve, an electric air pump, an electromagnetic air pump, a pneumatic element, a magnetic coupling thrust mechanism, a heating thrust generation mechanism and a chemical reaction thrust generation mechanism.
11. The gas density relay of claim 1, wherein: the first pressure changing piece and the second pressure changing piece are pistons or sealing isolation pieces.
12. The gas density relay of claim 1, wherein: the first pressure changing piece is also provided with a first partition sealing piece, and the first pressure changing piece is in sealing contact with the inner wall of the second cavity through the first partition sealing piece; and the second pressure change piece is also provided with a second partition sealing piece, and the second pressure change piece is in sealing contact with the inner wall of the third cavity through the second partition sealing piece.
13. The gas density relay of claim 12, wherein: the first partition sealing piece and the second partition sealing piece are any one of rubber rings, rubber pads or O-shaped rings.
14. The gas density relay of claim 1, wherein: the pressure regulating mechanism further comprises a sealing connecting piece, one end of the sealing connecting piece is in sealing connection with the opening of the third cavity, the other end of the sealing connecting piece is in sealing connection with the driving end of the driving part, or the second connecting piece and the driving part are sealed and wrapped in the sealing connecting piece by the sealing connecting piece; the sealing connector comprises one of a corrugated pipe, a sealing air bag and a sealing ring.
15. The gas density relay of claim 1, wherein: the intelligent control unit acquires the gas density value acquired by the gas density detection sensor; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor, and completes the on-line monitoring of the gas density of the monitored electrical equipment by the gas density relay.
16. The gas density relay of claim 15, wherein: the intelligent control unit calculates the average value P 20 Day average of the gas density value P 20 by adopting an average value method according to the preset sampling frequency on the gas density value monitored in one day, wherein the average value P 20 Day average is the accurate day density value P 20 Tianzhuang (Chinese character) ; or the intelligent control unit performs Fourier transform on the gas density value P 20 monitored in the time of day, converts the gas density value P 20 into a corresponding frequency spectrum, and filters out periodic components to obtain an accurate day density value P 20 Tianzhuang (Chinese character) .
17. The gas density relay of claim 16, wherein: the intelligent control unit obtains a maximum density value P 20max and a minimum density value P 20min in a day time, further obtains a first density difference value delta P1 20= P20max-P20 Tianzhuang (Chinese character) , and obtains a first temperature difference delta T1 corresponding to the first density difference value delta P1 20 according to the gas pressure temperature characteristic of the day density value P 20 Tianzhuang (Chinese character) ; likewise, a second density difference DeltaP 2 20= P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference DeltaT 2 corresponding to the second density difference DeltaP 2 20 is obtained according to the pressure and temperature characteristics of the gas with the natural density value of P 20 Tianzhuang (Chinese character) ; the largest value of the first temperature difference DeltaT 1 and the second temperature difference DeltaT 2 is the maximum temperature difference DeltaTmax of the corresponding date; or alternatively
The intelligent control unit obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) in a day time, so as to obtain a first density difference delta P1 20= P20max-P20 Tianzhuang (Chinese character) , and obtains a first temperature difference delta T1= delta P1 20/K according to a gas pressure temperature curve slope formula K= delta P/[ delta ] T with the daily density value P 20 Tianzhuang (Chinese character) ; likewise, a second density difference Δp2 20= P20 Tianzhuang (Chinese character) -P20min is obtained, and a second temperature difference Δt2= Δp2 20/K is obtained; the largest value of the first temperature difference DeltaT 1 and the second temperature difference DeltaT 2 is the maximum temperature difference DeltaTmax of the corresponding date; wherein DeltaP is the pressure difference on the gas pressure temperature curve with the density value of P 20 Tianzhuang (Chinese character) , deltaT is the temperature difference corresponding to the pressure difference DeltaP; or alternatively
The intelligent control unit obtains a maximum density value P 20max, a minimum density value P 20min and a daily density value P 20 Tianzhuang (Chinese character) within a day time, further obtains a first density difference value delta P1 20= P20max-P20 Tianzhuang (Chinese character) and a second density difference value delta P2 20= P20 Tianzhuang (Chinese character) -P20min, and inquires a preset data table according to the first density difference value delta P1 20 and the second density difference value delta P2 20 to obtain a first temperature difference delta T1 corresponding to the first density difference value delta P1 20 and a second temperature difference delta T2 corresponding to the second density difference value delta P2 20, wherein the largest one value of the first temperature difference delta T1 and the second temperature difference delta T2 is the maximum temperature difference value delta Tmax of the corresponding date; or alternatively
The intelligent control unit obtains a maximum density value P 20max and a minimum density value P 20min in a day time, further obtains P 20∑=（P20max+P20min）/2,△PT20= P20max- P20min, obtains a temperature difference DeltaT according to the pressure temperature characteristic of the gas with the density value P 20∑, and further obtains a maximum temperature difference DeltaTmax= DeltaT/2 or DeltaTmax= DeltaT/2*J of a corresponding date, wherein J is a preset coefficient, and the range of J is 0.85-1.15.
18. The gas density relay of claim 1, wherein: the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, so that the on-line verification of the gas density relay is completed; or alternatively
The intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor when the gas density relay body generates contact signal action or is switched, and converts the pressure value and the temperature value into a pressure value corresponding to 20 ℃ according to the gas pressure-temperature characteristic, namely, a gas density value, so as to finish the online verification of the gas density relay.
19. The gas density relay of claim 1, wherein: the intelligent control unit is controlled by field control and/or by background control.
20. The gas density relay of claim 1, wherein: the air inlet of the valve is communicated with the air path of the electrical equipment through the multi-way joint.
21. The gas density relay of claim 1, wherein: the gas density detection sensor is arranged on the gas density relay body; or the gas density detection sensor is provided on the pressure adjustment mechanism.
22. The gas density relay of claim 1, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or the gas density detection sensor adopts a gas density transmitter consisting of a pressure sensor and a temperature sensor; or the gas density detection sensor adopts a density detection sensor adopting quartz tuning fork technology.
23. The gas density relay of claim 22, wherein: the pressure sensor is arranged on the gas path of the gas density relay body; the temperature sensor is arranged on the gas path or outside the gas path of the gas density relay body, or is arranged in the gas density relay body, or is arranged outside the gas density relay body.
24. The gas density relay of claim 1, wherein: the on-line checking contact signal sampling unit is arranged on the gas density relay body; or the on-line check joint signal sampling unit is arranged on the pressure regulating mechanism.
25. The gas density relay of claim 1, wherein: the on-line checking contact signal sampling unit comprises a first connecting circuit and a second connecting circuit, wherein the first connecting circuit is connected with a contact point of the gas density relay body and a contact point signal control loop, and the second connecting circuit is connected with the contact point of the gas density relay body and the intelligent control unit;
In a non-verification state, the second connection circuit is opened, and the first connection circuit is closed; in the verification state, the on-line verification contact signal sampling unit cuts off the first connecting circuit, is communicated with the second connecting circuit, and connects the contact of the gas density relay body with the intelligent control unit.
26. The gas density relay of claim 1, wherein: the intelligent control system comprises at least two gas density relay bodies, at least two pressure regulating mechanisms, at least two on-line checking joint signal sampling units, an intelligent control unit and a gas density detection sensor, and is used for completing on-line checking of the gas density relay; or alternatively
The intelligent gas density relay comprises at least two gas density relay bodies, at least two pressure regulating mechanisms, at least two on-line checking joint signal sampling units, at least two intelligent control units and a gas density detection sensor, so that on-line checking of the gas density relay is completed; or alternatively
The intelligent gas density relay comprises at least two gas density relay bodies, at least two pressure regulating mechanisms, at least two on-line checking joint signal sampling units, at least two gas density detection sensors and an intelligent control unit, and the on-line checking of the gas density relay is completed.
27. A gas density monitoring device of intelligent control of life-span, its characterized in that includes: the gas density monitoring device is composed of the intelligent monitoring gas density relay with the full service life as claimed in any one of claims 1-26; or the gas density monitoring device comprises the intelligent monitoring gas density relay with the full service life as claimed in any one of claims 1 to 26.
28. A method of implementing a full life intelligent monitoring gas density relay as defined in claim 1, comprising:
When the pressure regulating mechanism works normally, the first pressure changing piece of the pressure regulating mechanism applies acting force to the valve, the valve is in an open state, the air inlet and the air outlet of the valve are communicated, and the gas density relay monitors the gas density value in the electrical equipment;
the gas density relay is based on the set checking time or/and checking instruction and the gas density value, and under the condition that the gas density relay is allowed to be checked:
The intelligent control unit is used for controlling the pressure regulating mechanism, a first pressure changing piece and a second pressure changing piece of the pressure regulating mechanism are driven by the driving component to move in a first direction, so that the valve is closed, and the gas paths of the gas density relay body and the electrical equipment are blocked; before the first pressure changing piece enters the second cavity, the volume of the air chamber of the pressure regulating mechanism is rapidly increased along with the movement of the second pressure changing piece, so that the pressure of the gas density relay body communicated with the air chamber is regulated, and the gas pressure of the gas density relay body is rapidly reduced; after the first pressure change piece enters the second cavity, the air chamber volume of the pressure regulating mechanism is slowly increased along with the movement of the first pressure change piece, so that the gas density relay body generates joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit obtains the gas density value according to the pressure value and the temperature value during joint action, or directly obtains the gas density value, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay body is completed;
After all contact signal verification works are completed, the intelligent control unit controls the pressure regulating mechanism, and the first pressure changing piece and the second pressure changing piece of the pressure regulating mechanism are driven by the driving part to move in a second direction opposite to the first direction, so that the valve is opened, and the gas circuit of the gas density relay body and the gas circuit of the electrical equipment are mutually communicated.
29. The method for implementing a full life intelligent monitoring gas density relay of claim 28, comprising:
when the pressure regulating mechanism works normally, the first pressure changing piece of the pressure regulating mechanism applies acting force to the valve, the valve is in an open state, the gas density relay monitors the gas density value in the electrical equipment, and meanwhile, the gas density relay monitors the gas density value in the electrical equipment on line through the gas density detection sensor and the intelligent control unit;
the gas density relay is based on the set checking time or/and checking instruction and the gas density value, and under the condition that the gas density relay is allowed to be checked:
The on-line checking contact signal sampling unit is adjusted to a checking state through the intelligent control unit, and in the checking state, the on-line checking contact signal sampling unit cuts off a control loop of a contact signal of the gas density relay body, and the contact of the gas density relay body is connected to the intelligent control unit;
The intelligent control unit is used for controlling the pressure regulating mechanism, a first pressure changing piece and a second pressure changing piece of the pressure regulating mechanism are driven by the driving component to move in a first direction, so that the valve is closed, and the gas paths of the gas density relay body and the electrical equipment are blocked; before the first pressure change piece enters the second cavity, the volume of the air chamber of the pressure regulating mechanism is rapidly increased along with the movement of the second pressure change piece, so that the pressure of the gas density relay body communicated with the air chamber is regulated, and the gas pressure of the gas density relay body is rapidly reduced; after the first pressure change piece enters the second cavity, the air chamber volume of the pressure regulating mechanism is slowly increased along with the movement of the first pressure change piece, so that the gas density relay body generates joint action, the joint action is transmitted to the intelligent control unit through the on-line checking joint signal sampling unit, the intelligent control unit obtains the gas density value according to the pressure value and the temperature value during joint action, or directly obtains the gas density value, the joint signal action value of the gas density relay body is detected, and the checking work of the joint signal action value of the gas density relay body is completed;
The intelligent control unit drives a first pressure change piece and a second pressure change piece of the pressure regulating mechanism to move in a second direction opposite to the first direction, so that the gas pressure slowly rises, the gas density relay body is subjected to contact reset, the contact reset is transmitted to the intelligent control unit through an on-line checking contact signal sampling unit, the intelligent control unit obtains a gas density value according to a pressure value and a temperature value when the contact is reset, or directly obtains the gas density value, the contact signal return value of the gas density relay body is detected, and the checking work of the contact signal return value of the gas density relay body is completed;
After all the contact signal checking works are completed, the first pressure changing piece of the pressure regulating mechanism is driven by the driving component to continuously move towards the second direction, so that the valve is opened, the gas paths of the gas density relay body and the electrical equipment are mutually communicated, the on-line checking contact signal sampling unit is adjusted to a working state, and the control loop of the contact signal of the gas density relay body is restored to a normal working state.
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| CN112924858B (en) * | 2021-01-26 | 2022-04-01 | 国网宁夏电力有限公司电力科学研究院 | On-site density relay calibration device and calibration method |
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