Simulation verification method and apparatus for gas density relay

Abstract

Embodiments of the present invention relate to a simulation verification method and apparatus for a gas density relay. The method comprises: acquiring a simulation detection signal value of a gas density relay at a temperature T to obtain a compensation amount at the temperature T; according to the compensation amount and a contact action value of the gas density relay at a normal temperature, acquiring a contact action pressure value of the gas density relay at the temperature T; according to the contact action pressure value, the temperature T, and a pressure-temperature characteristic relationship of gas to be detected, performing conversion to obtain an action value of the gas density relay at the temperature T; and verifying the gas density relay according to the action value. According to the technical solution of the embodiments of the present invention, a simulation detection signal is used for verifying the gas density relay, the gas density relay does not need to be detached, the detection process is safe, manual intervention is not required, and the accuracy of the obtained verification result is high.

Description

Simulation verification method and device of gas density relay

[0001] Cross-reference

[0002] This application is based on the Chinese patent application No. 2023101906224, filed on March 2, 2023, and claims priority to the Chinese patent application, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] Embodiments of the present application relate to the technical field of power equipment monitoring, in particular to a simulation verification method and device of a gas density relay. BACKGROUND

[0004] Power equipment is an important material basis for ensuring the safe operation of the power grid and reliable supply of electricity. With the development of the economy, the capacity of the power system has expanded rapidly, and the use of related equipment has soared, making it increasingly important to ensure the safe and reliable operation of the power system. SF6 is an excellent insulating / arc extinguishing gas and is widely used in high-voltage fields. Currently, most high-voltage equipment on the market uses SF6 as an insulating / arc extinguishing gas. The amount of SF6 gas in SF6 equipment directly affects the insulating / arc extinguishing performance. If leakage occurs during use, it will have a significant impact on the safe and reliable operation of the power equipment.

[0005] Currently, the commonly used mechanical density relay often has some problems during use, such as the surface oxidation, mechanism jamming, and damage of the SF6 gas density relay contacts installed on site due to long-term inaction, which results in the failure to send alarm / latching signals, making it difficult for operation and maintenance personnel to discover the problem in time. The regular verification of SF6 gas density relays has the following problems: there are numerous SF6 electrical equipment, and the annual regular verification requires a huge amount of manpower and resources. For some old equipment in untransformed substations, there is no design verification interface due to the long time elapsed, and the density relay needs to be disassembled on site during verification, which is inefficient and may damage the original sealing performance, resulting in gas leakage. Some density relays are installed at high positions, making it difficult to implement disassembly or on-site verification, which poses a safety hazard. In addition, the data during verification is manually transcribed, which is prone to omissions or errors. Some transformed or newly built stations use non-disassembly on-site verification, which requires disassembly of the electrical signal circuit, and during live-line work, it is easy to cause false alarms or latching signals to enter the relay protection, making the circuit breaker unable to act normally, and in severe cases, it may lead to a vicious accident.

[0006] SUMMARY

[0007] Based on the above situation of the prior art, the purpose of the embodiment of the present application is to provide a simulation verification method and device for a gas density relay, which realizes verification of the gas density relay by using a simulation detection signal, without disassembling the gas density relay, and the detection process is safe and does not require manual intervention, and the obtained verification result has high accuracy.

[0008] To achieve the above purpose, according to one aspect of the present application, a simulation verification method for a gas density relay is provided, the method comprising:

[0009] obtaining a simulation detection signal value P of the gas density relay at a temperature T TFZDZ , obtaining a compensation amount ΔP at the temperature T according to the simulation detection signal value P TFZDZ and a simulation detection signal value P 20FZCS of the gas density relay at normal temperature;

[0010] obtaining an alarm contact action pressure value P TBJDZ and / or a latching contact action pressure value P TBSDZ of the gas density relay at the temperature T according to the compensation amount ΔP and an alarm contact action value P 20BJDZCS and / or a latching contact action value P 20BSDZCS of the gas density relay at normal temperature;

[0011] obtaining an alarm action value P 20BJDZT and / or a latching action value P 20BSDZT of the gas density relay at the temperature T according to the alarm contact action pressure value P TBJDZ and / or the latching contact action pressure value P TBSDZ , the temperature value T, and a pressure-temperature characteristic relationship of the to-be-tested gas;

[0012] verifying the gas density relay according to the alarm action value P 20BJDZT and / or the latching action value P 20BSDZT ;

[0013] wherein P 20DZCS and / or P 20FZCS are respectively obtained in advance by a contact action value test and a simulation signal action value test of the gas density relay at normal temperature; the conversion according to the pressure-temperature characteristic relationship of the to-be-tested gas includes calculation by a betty-brichman equation.

[0014] Further, the simulation detection signal value P TFZDZ of the gas density relay is obtained by driving a contact action unit to output a driving signal and driving a simulation detection unit to output a simulation detection signal.

[0015] Further, the compensation amount ΔP is calculated according to the following formula: ΔP = P 20FZCS -P TFZDZ .

[0016] Further, the alarm contact action pressure value P TBJDZ and / or the lock contact action pressure value P TBSDZ is calculated according to the following formula respectively: P TBJDZ = P 20BJDZCS - ΔP P TBSDZ = P 20BSDZCS - ΔP.

[0017] Further, the method further comprises:

[0018] According to the alarm contact action value P 20BJDZCS and / or the lock contact action value P 20BSDZCS of the gas density relay at normal temperature, and the pressure-temperature characteristic relationship of the gas to be measured, the ideal alarm action pressure value P TLXBJDZ and / or the ideal lock action pressure value P TLXBSDZ of the gas density relay at T temperature is converted.

[0019] Further, according to the ideal alarm action pressure value P TLXBJDZ and / or the ideal lock action pressure value P TLXBSDZ , and the alarm contact action value P 20BJDZCS and / or the lock contact action value P 20BSDZCS of the gas density relay at normal temperature, the ideal alarm compensation amount ΔP LXBJ and / or the ideal lock compensation amount ΔP LXBS is calculated.

[0020] Further, the ideal alarm compensation amount ΔP LXBJ and / or the ideal lock compensation amount ΔP LXBS is calculated according to the following formula respectively: ΔPLX BJ = P20 BJ DZCS-PTLX BJ DZ ΔP LXBS = P 20BSDZCS - P TLXBSDZ .

[0021] Further, according to the compensation amount ΔP and the ideal alarm compensation amount ΔP LXBJ and / or the ideal lock compensation amount ΔP LXBS , the alarm compensation amount error value ΔP WZBJ and / or the lock compensation amount error value ΔP WZBS is calculated respectively: ΔP WZBJ = ΔP - ΔP LXBJ ΔP WZBS= ΔP - ΔP LXBS .

[0022] Further, according to the alarm contact action value P 20BJDZCS and / or the lock contact action value P 20BSDZCS of the gas density relay at normal temperature, and the alarm compensation error value ΔP WZBJ and / or the lock compensation error value ΔP WZBS , the alarm action value P 20BJDZT and / or the lock action value P 20BSDZT of the gas density relay at the temperature value T are obtained: P 20BJDZT = P 20BJDZCS - ΔP WZBJ P 20BSDZT = P 20BSDZCS - ΔP WZBS .

[0023] According to another aspect of the present application, a simulation verification device for a gas density relay is provided, which comprises:

[0024] a compensation value calculation module, configured to obtain a simulation detection signal value P TFZDZ of the gas density relay at the temperature T, and obtain a compensation value ΔP at the temperature T according to the simulation detection signal value P TFZDZ and a simulation detection signal value P 20FZCS of the gas density relay at normal temperature;

[0025] a contact action pressure value calculation module, configured to obtain an alarm contact action pressure value P 20BJDZCS and / or a lock contact action pressure value P 20BSDZCS of the gas density relay at the temperature T according to the compensation value ΔP and the alarm contact action value P TBJDZ and / or the lock contact action value P TBSDZ of the gas density relay at normal temperature;

[0026] an action value calculation module, configured to obtain the alarm action value P TBJDZ and / or the lock action value P TBSDZ of the gas density relay at the temperature value T according to the alarm contact action pressure value P 20BJDZT and / or the lock contact action pressure value P 20BSDZT , the temperature value T, and the pressure-temperature characteristic relationship of the gas to be detected;

[0027] wherein P 20DZCS and P 20FZCSThe alarm action value and the lockout action value of the gas density relay at the temperature value T are obtained according to the alarm action value and the lockout action value, the temperature value T, and the pressure-temperature characteristic relationship of the gas to be detected.

[0028] Further, the device further comprises a verification module, which is configured to verify the gas density relay according to the alarm action value P 20BJDZT and / or the lockout action value P 20BSDZT The gas density relay is verified.

[0029] To sum up, the embodiment of the present application provides a simulation verification method and device for a gas density relay, and the method comprises the following steps: obtaining a simulation detection signal value of the gas density relay at a temperature T, obtaining a compensation amount at the temperature T according to the simulation detection signal value and a simulation detection signal value of the gas density relay at normal temperature, obtaining an alarm contact action pressure value and a lockout contact action pressure value of the gas density relay at the temperature T according to the compensation amount and the alarm contact action value and the lockout contact action value of the gas density relay at normal temperature, obtaining an alarm action value and a lockout action value of the gas density relay at the temperature value T according to the alarm contact action pressure value and the lockout contact action pressure value, the temperature value T, and the pressure-temperature characteristic relationship of the gas to be detected, and verifying the gas density relay according to the alarm action value and the lockout action value. The technical scheme of the embodiment of the present application verifies the gas density relay by using the simulation detection signal, and does not need to disassemble the gas density relay, so that the detection process is safe and does not need manual intervention, and the verification result is accurate. BRIEF DESCRIPTION OF DRAWINGS

[0030] Fig. 1 is a schematic diagram of the working principle of the gas density relay related to the embodiment of the present application;

[0031] Fig. 2 is a schematic diagram of the structure of the simulation verification device for the gas density relay provided by the embodiment of the present application;

[0032] Fig. 3 is a flow chart of the simulation verification method for the gas density relay provided by the embodiment of the present application. DETAILED DESCRIPTION

[0033] To make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are only exemplary, and are not intended to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0034] It should be noted that the technical terms or scientific terms used in one or more embodiments of the present application should be understood as the general meaning understood by those skilled in the art to which the present disclosure belongs, unless otherwise defined. The terms "first", "second", and the like used in one or more embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and the like mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] The technical solutions of the present application are described in detail below in combination with the drawings. The embodiment of the present application provides a simulation verification method of a gas density relay. The working principle of the gas density relay involved in the embodiment of the present application is shown in Fig. 1. The gas density relay comprises a gas density relay body 1 and a gas density detection sensor, for example, comprising a pressure sensor 2 and a temperature sensor 3. The gas density relay is connected to an electrical equipment to be detected, and can detect the SF6 gas density of the electrical equipment to be detected. The gas density relay further comprises a microprocessor 71 and a power supply 72. The gas density relay body 1 comprises a pointer for indicating the gas density. The gas density detection sensor detects the pressure and temperature of the electrical equipment to be detected through the pressure sensor 2 and the temperature sensor 3, and calculates the gas density of the electrical equipment to be detected through a preset calculation method. The gas density relay further comprises a driving contact action unit 5, a signal sampling unit 6, an intelligent control unit 7, a simulation detection unit 8 and a communication unit 9. The signal sampling unit 6 comprises a first connecting circuit and a second connecting circuit. The first connecting circuit connects the contact of the gas density relay body 1 with a contact signal control loop, and the second connecting circuit connects the contact of the gas density relay body 1 with the intelligent control unit 7. In a non-verification state, the second connecting circuit is disconnected, and the first connecting circuit is closed. In a verification state, the signal sampling unit 6 cuts off the first connecting circuit, connects the second connecting circuit, and connects the contact of the gas density relay body 1 with the intelligent control unit 7. The first connecting circuit comprises a first electromagnetic relay J1, and the second connecting circuit comprises a second electromagnetic relay J2. The first electromagnetic relay J1 is provided with normally closed contacts J11 and J12, which are connected in series in the contact signal control loop. The second electromagnetic relay J2 is provided with normally open contacts J21 and J22, which are connected to the contact PJ of the gas density relay body 1. The first electromagnetic relay J1 and the second electromagnetic relay J2 can also be integrated into one, that is, a middle relay with normally open and normally closed contacts. In the non-verification state, the normally closed contacts J11 and J12 are closed, and the normally open contacts J21 and J22 are disconnected. The gas density relay monitors the output state of the contact PJ in real time. In the verification state, the normally closed contacts J11 and J12 are disconnected, and the normally open contacts J21 and J22 are closed. The contact PJ of the gas density relay body 1 is connected to the intelligent control unit 7 through the normally open contacts J21 and J22. Thus, the contact action value verification and test of the gas density relay can be realized through the intelligent control unit 7, the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3), the driving contact action unit 5 and the signal sampling unit 6 without power-off of the electrical equipment. The contact PJ of the gas density relay body 1 outputs an alarm or locking signal according to the measured gas density value. The simulation detection unit 8 can be a simulation signal device, an angle sensor, a position sensor or a photoelectric sensor.In the embodiment, the simulation detection unit 8 adopts a simulation signal device, which is configured to output a simulation detection signal when the monitored gas density of the gas density relay body 1 changes to a set value. The simulation signal device includes one or more of a micro switch, an electric contact, a mercury switch, a photoelectric switch, a reed switch, a proximity switch, an electronic switch, a photoelectric sensor, a variable resistor, a voltage or current measurer. The simulation detection signal includes one of a switching value signal, a digital signal and an analog signal, and the switching value signal is adopted as the simulation detection signal in the embodiment. The simulation detection unit 8 can adopt an electric contact, such as a common electric contact or a magnetic assisted electric contact. FIG. 2 shows a structural schematic diagram of the simulation calibration device of the gas density relay according to the embodiment. As shown in FIG. 2, the device includes the gas density relay body 1, a gas density detection sensor (i.e. a pressure sensor 2 and a temperature sensor 3), a smart control unit 7, a simulation detection unit 8 and a communication unit 9. The pressure sensor 2, the temperature sensor 3 and the smart control unit 7 are arranged in the gas density relay body 1. On the gas path, the pressure sensor 2 of the gas density detection sensor is in communication with the gas density relay body 1. The pressure sensor 2, the temperature sensor 3, the simulation detection unit 8 and the communication unit 9 are connected with the smart control unit 7 respectively. The gas density relay body 1 includes a shell 101, a base 102, an end seat 108, a pressure detection element 103, a temperature compensation element 104, a plurality of signal generators 109 (output contact signal), a signal action mechanism 111, a core 105, a pointer 106 and a scale disc 107 arranged in the shell 101. The simulation detection unit 8 and the communication unit 9 are arranged in the shell 101 of the gas density relay body 1 and connected with the smart control unit 7 respectively, and an antenna of the communication unit is arranged outside the shell 101. One end of the pressure detection element 103 is fixed on and in communication with the base 102, and the other end of the pressure detection element 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 connected with the core 105. The pointer is arranged at the front end of the central shaft of the core. In the embodiment, the simulation detection unit 8 adopts an electric contact, such as a common electric contact or a magnetic assisted electric contact. The core 105 is fixed on the base 102, the other end of the temperature compensation element 104 is connected with the core 105, the pointer 106 is installed on the core 105 and arranged in front of the scale disc 107, and the pointer 106 combines the scale disc 107 to display the gas density value.The signal generator 109 comprises magnetic assisted electric contacts or micro switches, and the gas density relay body 1 outputs contact signals through the signal generator 109; the pressure detection element 103 comprises a baratron or a bellows, and in the embodiment, a baratron is adopted; the temperature compensation element 104 adopts a temperature compensation sheet or a gas enclosed in the shell, and in the embodiment, a temperature compensation sheet is adopted. The gas density relay body 1 of the embodiment can further comprise an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch or a gas pressure gauge. The simulation detection unit 8 is arranged on the inner shell of the shell 101, and the simulation detection unit 8 can be a simulation signal indicator, an angle sensor (or a position sensor, or a photoelectric sensor). In the embodiment, the simulation detection unit 8 adopts a simulation signal indicator, which is configured to output a simulation detection signal when the monitored gas density of the gas density relay body 1 changes to a set value. As shown in the example of FIG. 2, three pairs of magnetic assisted electric contacts are adopted, one pair of which is used as an alarm contact signal, another pair of which is used as a locking contact signal, and the other pair of which is used as the simulation detection unit 8, which outputs a switching value signal as a simulation detection signal when the monitored gas density changes to a set value. The simulation detection unit 8 is arranged on the magnetic assisted electric contacts of the gas density relay (for example, the signal generator 109), and when the monitored gas density changes to a set value, the simulation detection unit 8 outputs a switching value signal as a simulation detection signal to the intelligent control unit 7, and when the intelligent control unit 7 collects the signal, it immediately collects the gas density value and other data through the gas density detection sensor (i.e., the pressure sensor 2 and the temperature sensor 3). That is, the intelligent control unit 7 is connected with the gas density detection sensor (i.e., the pressure sensor 2 and the temperature sensor 3) and the simulation detection unit 8, receives the data and / or signals collected by the gas density detection sensor (i.e., the pressure sensor 2 and the temperature sensor 3) and / or the simulation detection unit 8, and combines the contact action value P at a temperature of 20℃ and the simulation detection signal value P at a temperature of 20℃ set (stored) in advance. 20DZCS and the simulation detection signal value P at a temperature of 20℃ 20FZCS, and the monitored simulation detection signal value, according to the correlation characteristic relationship, the new (or real-time) contact action value at this time is obtained by calculation, and then the simulation verification of the density relay is completed. The driving contact action unit 5 is configured to output a driving signal to drive the simulation detection unit 8 to output a simulation detection signal. The fluctuation of the ambient temperature, or the simulation detection unit 8 can be driven to output the simulation detection signal by driving the contact action unit 5 (for example, natural temperature change fluctuation, which can also include heating or pressure regulation, etc.). The driving contact action unit 5 includes a heating element 51 and a heat preservation element 52, and the heating element 51 and the heat preservation element 52 are respectively arranged on the shell 101 of the gas density relay. As shown in FIG. 1, in the circuit, the driving contact action unit 5 is connected with the intelligent control unit 7, that is, the heating element 51 of the driving contact action unit 5 can be controlled to be connected with the circuit by the intelligent control unit 7, so that the heating element 51 heats the temperature compensation element 104 of the gas density relay, and the simulation detection unit 8 outputs a switching value signal as the simulation detection signal to the intelligent control unit 7.

[0036] As shown in FIG. 1, the intelligent control unit 7 is connected with the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3), the simulation detection unit 8, and the driving contact action unit 5. The intelligent control unit 7 can collect the gas density value through the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3); and the intelligent control unit 7 controls the circuit of the heating element 51 of the driving contact action unit 5 to be connected, so that the heating element 51 heats the temperature compensation element 104 of the gas density relay, and the simulation detection unit 8 outputs a switching value signal as the simulation detection signal to the intelligent control unit 7. The simulation signal device includes one or more of a micro switch, an electrical contact, a mercury switch, a photoelectric switch, a reed switch, a proximity switch, an electronic switch, a photoelectric sensor, a variable resistor, a voltage or current measurer. The simulation detection signal includes one of a switching value signal, a digital value signal, and an analog value signal, and the switching value signal is adopted in this embodiment. The set value of the simulation detection signal output by the simulation signal device is usually 90% to 110% of the rated pressure value Pe of the density relay, that is, the set value of the simulation detection signal output by the simulation signal device = (90% to 110%) * Pe.

[0037] The working principle is: specifically, the intelligent control unit 7 (or background) sets (stores) the contact action value P 20DZCS at 20℃, and the simulation detection signal value P 20FZCSThe intelligent control unit 7 is connected to the gas density detection sensor (i.e., pressure sensor 2 and temperature sensor 3) and the simulation detection unit 8 respectively, receives the data and / or signals collected by the gas density detection sensor (i.e., pressure sensor 2 and temperature sensor 3) and / or the simulation detection unit 8, and combines the pre-set (stored) contact action value P 20DZCS , and the simulated detection signal value P when the temperature is 20℃ 20FZCS , and the monitored simulation detection signal value, according to the relevant characteristic relationship, the new (or real-time) contact action value at this time is calculated, and then the simulation verification of the density relay is completed. 20DZCS The contact action value of the gas density relay at room temperature (usually 20°C) obtained in advance by testing, which can include the alarm contact action value and the locking contact action value. The alarm contact action value is expressed as P 20BJDZCS Indicates that P 20BJDZCS The gas density relay is obtained in advance through the alarm contact action value test of the gas density relay at room temperature; and the locking contact action value is obtained in advance through the alarm contact action value test of the gas density relay at room temperature; 20BSDZCS Indicates that P 20BSDZCS It is obtained in advance by the gas density relay through the locking contact action value test of the gas density relay at room temperature.

[0038] FIG3 shows a flow chart of a simulation verification method for the gas density relay. As shown in FIG3 , the method includes the following steps:

[0039] S202, obtain the simulation detection signal value P of the gas density relay at temperature T TFZDZ , according to the simulation detection signal value P TFZDZ And the simulated detection signal value P of the gas density relay at room temperature 20FZCS , get the compensation value ΔP at temperature T. Among them, the simulation detection signal value P TFZDZ The compensation amount ΔP can be obtained by driving the contact action unit to output a driving signal and driving the simulation detection unit to output a simulation detection signal. In this step, the compensation amount ΔP can be calculated according to the following formula: ΔP=P 20FZCS -P TFZDZ .

[0040] S204, based on the compensation value ΔP and the alarm contact action value P of the gas density relay at room temperature 20BJDZCS and the blocking contact action value P 20BSDZCS , get the alarm contact action pressure value P of the gas density relay at temperature T TBJDZ And the locking contact action pressure value P TBSDZ In this step, the alarm contact action pressure value P can be calculated according to the following formulas: TBJDZ And the locking contact action pressure value P TBSDZ : PTBJDZ = P 20BJDZCS - ΔP P TBSDZ = P 20BSDZCS - ΔP.

[0041] S206, according to the alarm contact action pressure value P TBJDZ and the latching contact action pressure value P TBSDZ , the temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured, the alarm action value P 20BJDZT and the latching action value P 20BSDZT of the gas density relay at the temperature value T are converted.

[0042] S208, the gas density relay is verified according to the alarm action value P 20BJDZT and the latching action value P 20BSDZT .

[0043] Wherein, P 20DZCS and P 20FZCS are respectively obtained by the contact action value test and the simulation signal action value test of the gas density relay at normal temperature when the gas density relay is shipped; the conversion according to the pressure-temperature characteristic relationship of the gas to be measured includes calculation by the Betti-Bridgman equation. In the embodiment of the present application, the normal temperature condition refers to the 20℃ ambient temperature condition.

[0044] The following is described by taking a gas density relay with specific parameters as an example, for example, the parameters of the gas density relay are: the rated pressure value is 0.6MPa; the alarm pressure value is 0.55MPa; and the latching pressure value is 0.50MPa. The set value of the simulation detection signal output by the simulation detection unit 8 is 0.58MPa (the set value of the simulation signal output by the simulation detection signal is = (90% ~ 110%)*Pe). When shipped, the alarm, latching contact action value, and the simulation detection signal value at the temperature of 20℃ of the gas density relay are tested in the 20℃ environment. Assuming that the alarm contact action value P 20BJDZCS = 0.5553MPa, the latching contact action value P 20BSDZCS = 0.5065MPa, and the simulation detection signal value P 20FZCS = 0.5824M in the 20℃ environment, and all of these pre-tested data are stored in the intelligent control unit 7 (or the upper computer). After the gas density relay is operated for a period of time, the gas density relay in operation, assuming that the intelligent control unit 7 receives the pressure value and the temperature value of the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3) in the field, and the gas density value P 20XZThe gas density value of the electrical equipment can be monitored in real time, and the gas density of the gas chamber of the electrical equipment is monitored online. The contact of the gas density relay is simulated and verified. Specifically, the simulation detection unit 8 can be driven to output a simulation detection signal by driving the contact action unit 5. For example, when the driving contact action unit 5 is heated to a temperature T = 51.43℃, the simulation detection unit 8 outputs a simulation detection signal, and at this time, the pressure value P TFZDZ = 0.6802 MPa. At this time, the algorithm of the alarm contact alarm action value P 20BJDZT : the compensation amount ΔP at T (= 51.43℃) temperature is obtained: ΔP = P 20FZCS -P TFZDZ = 0.5824-0.6802 = -0.0978 MPa

[0045] Further, the alarm contact action pressure value P TBJDZ at T (= 51.43℃) temperature is obtained: P TBJDZ = P 20BJDZCS - ΔP = 0.5553-(-0.0978) = 0.6531 MPa

[0046] Then, according to the alarm contact action pressure value P TBJDZ and the temperature value T = 51.43℃, and according to the pressure-temperature characteristic relationship of the gas, specifically, according to the Beattie-Bridgman equation, that is, the SF6 gas state parameter Beattie-Bridgman formula can be used for conversion. The Beattie-Bridgman equation is shown in the following formula: p = (RTB-A)d 2 + RTd A = 73.882 × 10 -5 -5.132105 × 10 -7 d B = 2.50695 × 10 -3 -2.12283 × 10 -6 d R = 56.9502 × 10 -5

[0047] In the formula, p represents the absolute pressure (×0.1 MPa); d represents the density (kg / m 3 ), and T represents the temperature (K).

[0048] According to the Beattie-Bridgman equation, the action value P 20BJDZT at the contact T (= 51.43℃) temperature can be converted: P 20BJDZT = F(T, P TBJDZ ) = F(51.43℃, 0.6531 MPa) = 0.5666 MPa

[0049] Further, the simulation check of the alarm contact of the density relay is completed.

[0050] For other gases, such as SF6 / N2 mixed gas, the state equation of SF6 / N2 mixed gas can also be calculated by using Dalton partial pressure law, Beattie-Bridgman equation and ideal gas state equation.

[0051] Similarly, for the simulation calculation algorithm of the latching contact, the compensation amount ΔP at the temperature T (=51.43℃) is obtained: ΔP = P 20FZCS -P TFZDZ = 0.5824-0.6802 = -0.0978 MPa

[0052] Further, the latching contact action pressure value P TBSDZ at the temperature T (=51.43℃) is obtained: P TBSDZ = P 20BSDZCS - ΔP = 0.5065-(-0.0978) = 0.6043 MPa

[0053] Then, according to the latching contact action pressure value P TBSDZ = 0.6043 MPa and the temperature value T = 51.43℃, and according to the pressure-temperature characteristic relationship of the gas, specifically, according to the Beattie-Bridgman equation, that is, the SF6 gas state parameter Beattie-Bridgman formula can be used for conversion, the action value P 20BSDZT at the temperature T (=51.43℃) is obtained: P 20BSDZT = F(T, P TBSDZ ) = F(51.43℃, 0.6043 MPa) = 0.5243 MPa

[0054] Further, the simulation check of the latching contact of the density relay is completed.

[0055] In addition, according to the pressure value P TFZDZ = 0.6802 MPa and the temperature value T = 51.43℃, and according to the Beattie-Bridgman equation for conversion, the P 20TFZDZ at the temperature T (=51.43℃) is obtained: P 20TFZDZ = F(T, P TFZDZ ) = F(51.43℃, 0.6802 MPa) = 0.59 MPa

[0056] The simulation detection signal value of the simulation detection signal at temperature T (= 51.43°C) is 0.59 MPa, which can also be used as a basis for judging the performance of the gas density relay. The intelligent control unit 7 (or the background) can compare the historical data before and after, judge the performance of the density relay, and determine the performance change trend and aging trend of the density relay. The data before and after the monitoring can be compared, for example, the latest test data Pn, the previous test data Po, and the time interval ΔT between the previous and subsequent tests. The data change amount ΔPb can be determined, ΔPb = Pn - Po, the data change speed ΔVp = (Pn - Po) / ΔT, and the performance of the gas density relay can be judged according to the data change amount ΔPb and the data change speed ΔVp. The service life can also be determined according to the maximum allowable change amount.

[0057] In this way, the contact of the density relay can be simulated and verified and diagnosed to ensure the performance of the density relay. When the simulated verification / diagnosis of the density relay contact action value exceeds the required error, an abnormal alarm information is sent to the background.

[0058] According to some optional embodiments, the method further comprises the following steps:

[0059] According to the alarm contact action value P 20BJDZCS and the latching contact action value P 20BSDZCS of the gas density relay at normal temperature, and the pressure-temperature characteristic relationship of the gas to be tested, the ideal alarm action pressure value P TLXBJDZ and the ideal latching action pressure value P TLXBSDZ of the gas density relay at T temperature are calculated.

[0060] According to the ideal alarm action pressure value P TLXBJDZ and the ideal latching action pressure value P TLXBSDZ , and the alarm contact action value P 20BJDZCS and the latching contact action value P 20BSDZCS of the gas density relay at normal temperature, the ideal alarm compensation amount ΔP LXBJ and the ideal latching compensation amount ΔP LXBS are calculated: ΔP LXBJ = P 20BJDZCS - P TLXBJDZ ΔP LXBS = P 20BSDZCS - P TLXBSDZ .

[0061] According to the compensation amount ΔP and the ideal alarm compensation amount ΔP LXBJ and the ideal latching compensation amount ΔP LXBS , the alarm compensation amount error value ΔP WZBJand the latching compensation error value ΔP WZBS : ΔP WZBJ = ΔP - ΔP LXBJ ΔP WZBS = ΔP - ΔP LXBS

[0062] According to the alarm contact action value P 20BJDZCS and the latching contact action value P 20BSDZCS , and the alarm compensation error value ΔP WZBJ and the latching compensation error value ΔP WZBS , the alarm action value P 20BJDZT and the latching action value P 20BSDZT of the gas density relay at the temperature value T are obtained: P 20BJDZT = P 20BJDZCS - ΔP WZBJ P 20BSDZT = P 20BSDZCS - ΔP WZBS

[0063] The following is described by taking a gas density relay with specific parameters as an example. For example, the parameters of the gas density relay are as follows: the rated pressure value is 0.6 MPa; the alarm pressure value is 0.55 MPa; and the latching pressure value is 0.50 MPa. The set value of the simulation detection signal output by the simulation detection unit 8 is 0.58 MPa (the set value of the simulation detection signal output by the simulation signal is (90%~110%)*Pe). When the gas density relay is shipped, the alarm, latching contact action values, and the simulation detection signal value at the temperature of 20°C are tested in the environment of 20°C. For example, the alarm contact action value P 20BJDZCS = 0.5553 MPa, the latching contact action value P 20BSDZCS = 0.5065 MPa, and the simulation detection signal value P 20FZCS = 0.5824 MPa at 20°C. These pre-tested data are all stored in the intelligent control unit 7 (or the upper computer). After the gas density relay is operated for a period of time, the gas density relay is in operation, and it is assumed that the intelligent control unit 7 receives the pressure value and the temperature value of the gas density detection sensor (i.e., the pressure sensor 2 and the temperature sensor 3), and obtains the gas density value P 20XZ of the gas chamber of the electrical equipment at the present moment through conversion, that is, the gas density value of the electrical equipment can be monitored in real time.

[0064] The contacts of the gas density relay are simulated and verified. Specifically, the simulation detection unit 8 can be driven to output the simulation detection signal by driving the contact action unit 5. For example, when the contact action unit 5 is heated to a temperature T = 51.43°C, the simulation detection unit 8 outputs the simulation detection signal, and the pressure value P​​TFZDZ = 0.6802 MPa, at this time, for the alarm contact alarm action value P 20BJDZT of the algorithm, the compensation amount ΔP at T (= 51.43°C) temperature is obtained: ΔP = P 20FZCS - P TFZDZ = 0.5824 - 0.6802 = -0.0978 MPa

[0065] According to the alarm contact action value P 20BJDZCS at normal temperature (20°C in this embodiment) and the temperature value T = 51.43°C, and according to the pressure-temperature characteristic relationship of the gas, which can be converted according to the Beattie-Bridgman equation, that is, the SF6 gas state parameter Beattie-Bridgman formula can be used. The ideal alarm action pressure value P TLXBJDZ of the contact at T (= 51.43°C) temperature is obtained: P TLXBJDZ = 0.6401 MPa

[0066] The ideal alarm compensation amount ΔP LXBJ is obtained: ΔP LXBJ = P 20BJDZCS - P TLXBJDZ = 0.5553 - 0.6401 = -0.0848 MPa

[0067] Further, the compensation amount error ΔP WZBJ is obtained: ΔP WZBJ = ΔP - ΔP LXBJ = -0.0978 - (-0.0848) = -0.013 MPa

[0068] Thus, the alarm contact action value P 20BJDZT of the contact at T temperature is obtained: P 20BJDZT = P 20BJDZCS - ΔP WZBJ = 0.5553 - (-0.013) = 0.5683 MPa

[0069] Further, the simulation verification of the alarm contact of the gas density relay is completed.

[0070] For the algorithm of the latching contact latching action value P 20BSDZT , the compensation amount ΔP at T (= 51.43°C) temperature is obtained: ΔP = P 20FZCS - P TFZDZ = 0.5824 - 0.6802 = -0.0978 MPa

[0071] According to the contact latching action value P 20BSDZCSAnd the temperature value T = 51.43 ° C, and then according to the pressure-temperature characteristic relationship of the gas, specifically according to the Beattie-Bridgman equation, that is, the SF6 gas state parameter Beattie-Bridgman (Beattie-Bridgman) formula can be used for conversion to obtain the ideal locking action pressure value P of the contact at T (= 51.43 ° C) temperature. TLXBSDZ : P TLXBSDZ =0.5839MPa

[0072] Get the ideal locking compensation ΔP LXBS : ΔP LXBS =P 20BSDZCS -P TLXBSDZ =0.5065-0.5839=-0.0774MPa

[0073] Then we get the compensation error ΔP WZBS : ΔP WZBS =ΔP-ΔP LXBS =-0.0978-(-0.0774)=-0.0204MPa

[0074] Thus, the locking contact action value P of the contact at temperature T can be obtained. 20BSDZT : P 20BSDZT =P 20BSDZCS -ΔP WZBS =0.5065MPa-(-0.0204)=0.5269MPa

[0075] Then the simulation verification of the locking contacts of the gas density relay is completed.

[0076] In the verification methods provided by the two embodiments of the present invention, the calculated alarm contact simulation calculation value and the calculated locking contact simulation calculation value have slight deviations, with the differences being 0.0017 MPa and 0.0026 MPa respectively, and both are applicable to engineering applications.

[0077] An embodiment of the present invention further provides a simulation verification device for a gas density relay, the device comprising:

[0078] Compensation calculation module, used to obtain the simulation detection signal value P of the gas density relay at temperature T TFZDZ , according to the simulation detection signal value P TFZDZ And the simulated detection signal value P of the gas density relay at room temperature 20FZCS , get the compensation amount ΔP at temperature T;

[0079] The contact action pressure value calculation module is used to calculate the alarm contact action value P of the gas density relay based on the compensation amount ΔP and the normal temperature. 20BJDZCS and the blocking contact action value P 20BSDZCS, to obtain the alarm contact action pressure value P of the gas density relay at the temperature T TBJDZ and the lockout contact action pressure value P TBSDZ ;

[0080] The action value calculation module is configured to obtain the alarm action value P TBJDZ and the lockout action value P TBSDZ of the gas density relay at the temperature value T according to the alarm contact action pressure value P 20BJDZT and the lockout contact action pressure value P 20BSDZT , the temperature value T, and the pressure-temperature characteristic relationship of the to-be-tested gas.

[0081] The verification module is configured to verify the gas density relay according to the alarm action value P 20BJDZT and the lockout action value P 20BSDZT .

[0082] Wherein, P 20DZCS and P 20FZCS are respectively obtained by the contact action value test and the simulation signal action value test of the gas density relay at normal temperature when the gas density relay is shipped; and the conversion according to the pressure-temperature characteristic relationship of the to-be-tested gas includes calculation by the Bethe-Bridgman equation. For the SF6 / N2 mixed gas, the state equation of the SF6 / N2 mixed gas can be calculated by using the Dalton partial pressure law, the Bethe-Bridgman equation, and the ideal gas state equation.

[0083] The specific manner in which each module in the simulation verification device of the gas density relay of the embodiment realizes its function is the same as each step of the simulation verification method of the gas density relay involved in the above embodiment, and the repeated description thereof will be omitted here.

[0084] In summary, the embodiment of the present application provides a simulation verification method and device of a gas density relay, the method comprising: obtaining a simulation detection signal value of the gas density relay at temperature T, obtaining a compensation amount at temperature T according to the simulation detection signal value and a simulation detection signal value of the gas density relay at normal temperature; obtaining an alarm contact action pressure value and a lockout contact action pressure value of the gas density relay at temperature T according to the compensation amount and an alarm contact action value and a lockout contact action value of the gas density relay at normal temperature; obtaining an alarm action value and a lockout action value of the gas density relay at temperature T according to the alarm contact action pressure value and the lockout contact action pressure value, the temperature value T and a pressure-temperature characteristic relationship of the to-be-detected gas; and verifying the gas density relay according to the alarm action value and the lockout action value. The technical scheme of the embodiment of the present application realizes the verification of the gas density relay by using the simulation detection signal, does not need to disassemble the gas density relay, the detection process is safe and does not need manual intervention, and the obtained verification result has high accuracy.

[0085] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation of the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A simulation calibration method for a gas density relay, characterized in that: The method comprises: Get the simulated detection signal value P of the gas density relay at temperature T TFZDZ , according to the simulation detection signal value P TFZDZ And the simulated detection signal value P of the gas density relay at room temperature 20FZCS , get the compensation amount ΔP at temperature T; According to the compensation value ΔP and the alarm contact action value P of the gas density relay at room temperature, 20BJDZCS and / or blocking contact action value P 20BSDZCS , get the alarm contact action pressure value P of the gas density relay at temperature T TBJDZ And / or locking contact action pressure value P TBSDZ ; According to the alarm contact action pressure value P TBJDZ And / or locking contact action pressure value P TBSDZ , temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured are converted to obtain the alarm action value P of the gas density relay at the temperature value T 20BJDZT and / or blocking action value P 20BSDZT ; According to the alarm action value P 20BJDZT and / or blocking action value P 20BSDZT calibrating the gas density relay; Among them, P 20DZCS and / or P 20FZCS The gas density relay is pre-obtained through a contact action value test and a simulation signal action value test of the gas density relay at room temperature; the conversion according to the pressure-temperature characteristic relationship of the gas to be measured includes calculation through the Betty-Bridgeman equation.

2. The method according to claim 1, characterized in that The simulated detection signal value P of the gas density relay TFZDZ The method is obtained by driving the contact action unit to output a driving signal and driving the simulation detection unit to output a simulation detection signal.

3. The method according to claim 1, characterized in that The compensation amount ΔP is calculated according to the following formula: ΔP=P 20FZCS -P TFZDZ 。 4. The method according to claim 3, characterized in that Calculate the alarm contact action pressure value P according to the following formulas: TBJDZ And / or locking contact action pressure value P TBSDZ : P TBJDZ =P 20BJDZCS -ΔP P TBSDZ =P 20BSDZCS -ΔP。 5. The method according to claim 1, wherein The method further comprises: According to the alarm contact action value P of the gas density relay at room temperature 20BJDZCS and / or blocking contact action value P 20BSDZCS , and the pressure-temperature characteristic relationship of the gas to be measured is converted to obtain the ideal alarm action pressure value P of the gas density relay at temperature T TLXBJDZ And / or ideal locking action pressure value P TLXBSDZ .

6. The method according to claim 5, characterized in that According to the ideal alarm action pressure value P TLXBJDZ And / or ideal locking action pressure value P TLXBSDZ , and the alarm contact action value P of the gas density relay at room temperature 20BJDZCS and / or blocking contact action value P 20BSDZCS , calculate the ideal alarm compensation ΔP LXBJ and / or ideal locking compensation ΔP LXBS .

7. The method according to claim 6, characterized in that Calculate the ideal alarm compensation ΔP according to the following formulas: LXBJ and / or ideal locking compensation ΔP LXBS : ΔP LXBJ =P 20BJDZCS -P TLXBJDZ ΔP LXBS =P 20BSDZCS -P TLXBSDZ 。 8. The method according to claim 7, characterized in that According to the compensation amount ΔP and the ideal alarm compensation amount ΔP LXBJ and / or ideal locking compensation ΔP LXBS , respectively calculate the alarm compensation error value ΔP WZBJ and / or lockout compensation error ΔP WZBS : ΔP WZBJ =ΔP-ΔP LXBJ ΔP WZBS =ΔP-ΔP LXBS 。 9. The method according to claim 8, characterized in that According to the alarm contact action value P of the gas density relay at room temperature 20BJDZCS and / or blocking contact action value P 20BSDZCS , and the alarm compensation error value ΔP WZBJ and / or lockout compensation error ΔP WZBS , get the alarm action value P of the gas density relay at temperature T 20BJDZT and / or blocking action value P 20BSDZT : P 20BJDZT =P 20BJDZCS -ΔP WZBJ P 20BSDZT =P 20BSDZCS -ΔP WZBS 。 10. A simulation calibration device for a gas density relay, characterized in that: The device comprises: Compensation calculation module, used to obtain the simulation detection signal value P of the gas density relay at temperature T TFZDZ , according to the simulation detection signal value P TFZDZ And the simulated detection signal value P of the gas density relay at room temperature 20FZCS , get the compensation amount ΔP at temperature T; The contact action pressure value calculation module is used to calculate the alarm contact action value P of the gas density relay based on the compensation amount ΔP and the normal temperature. 20BJDZCS and / or blocking contact action value P 20BSDZCS , get the alarm contact action pressure value P of the gas density relay at temperature T TBJDZ And / or locking contact action pressure value P TBSDZ ; Action value calculation module, used to calculate the action pressure value P of the alarm contact TBJDZ And / or locking contact action pressure value P TBSDZ , temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured are converted to obtain the alarm action value P of the gas density relay at the temperature value T 20BJDZT and / or blocking action value P 20BSDZT ; Among them, P 20DZCS and P 20FZCS The gas density relay is pre-obtained through a contact action value test and a simulation signal action value test of the gas density relay at room temperature; the conversion according to the pressure-temperature characteristic relationship of the gas to be measured includes calculation through the Betty-Bridgeman equation.

11. A simulation verification device for a gas density relay according to claim 10, characterized in that: The device further comprises a verification module for determining the alarm action value P 20BJDZT and / or blocking action value P 20BSDZT The gas density relay is calibrated.

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