Simulation verification method and device for gas density relay

Abstract

A simulation verification method and device for a gas density relay. The method comprises: acquiring a simulation detection signal value at temperature T and a gas density value measured by a gas density measurement sensor (S102); calculating a compensation amount at temperature T according to the simulation detection signal value, the measured gas density value, a corresponding gas pressure value at temperature T, and a simulation detection signal value at room temperature (S104); calculating a contact action pressure value at temperature T according to the compensation amount and a contact action value at room temperature (S106); obtaining a contact action value at temperature T by conversion according to the contact action pressure value at temperature T and a pressure-temperature characteristic relationship of gas (S108); and performing contact simulation verification on a density relay by using the contact action value at temperature T (S110). Using a simulation detection signal to verify a density relay does not need to disassemble the density relay, the detection process is safe, no manual intervention is required, and the obtained verification result has high accuracy.

Description

Simulation verification method and device of gas density relay

[0001] Cross-reference

[0002] The present application is based on and claims priority from Chinese Patent Application No. 2023101907903, filed on March 2, 2023, the entire contents of which are hereby incorporated by reference into the present application. 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 inability 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, leading to 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 calibration method and device for a gas density relay, which calibrates 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 need manual intervention, and the calibration result obtained is more accurate.

[0008] To achieve the above purpose, according to one aspect of the present application, a simulation calibration method for a gas density relay is provided, the gas density relay comprising a gas density relay body and a gas density detection sensor, characterized in that the method comprises:

[0009] S102, acquiring a simulation detection signal value P at a temperature T 20TFZ and a gas density value P detected by the gas density detection sensor 20TQT ;

[0010] S104, calculating a compensation amount ΔP at the temperature T according to the simulation detection signal value P 20TFZ , the detected gas density value P 20TQT , a corresponding gas pressure value P TQT at the temperature T, and a simulation detection signal value P at normal temperature 20FZCSX ;

[0011] S106, calculating a contact action pressure value P TDZ at the temperature T according to the compensation amount ΔP and a contact action value P 20DZCS at normal temperature ;

[0012] S108, converting the contact action pressure value P TDZ at the temperature T and the pressure-temperature characteristic relationship of the gas to obtain a contact action value P 20DZT at the temperature T ;

[0013] S110, performing simulation calibration of the contact of the gas density relay by using the contact action value P 20DZT at the temperature T.

[0014] Further, the compensation amount ΔP is calculated according to the following formula: ΔP=P 20TFZ +P 20TQT -P TQT -P 20FZCSX .

[0015] Further, the different gas density values P 20TQT at normal temperature and the corresponding simulation detection signal values P 20FZCSX are detected in advance and saved ;

[0016] According to the gas density value P 20TQTGet the corresponding simulation detection signal value P at room temperature 20FZCSX .

[0017] Furthermore, the contact action pressure value P at temperature T is calculated according to the following formula: TDZ : P TDZ =P 20DZCS -ΔP.

[0018] Furthermore, the contact action value P at temperature T is calculated according to the following formula: T20DZ : P T20DZ =F(T,P TDZ )

[0019] Wherein, F() indicates calculation according to at least one of the Betty-Bridgeman equation, Dalton's law of partial pressures, or the ideal gas state equation.

[0020] Furthermore, the method further comprises:

[0021] S106, according to the contact action value P at normal temperature 20DZCS The ideal operating pressure value P of the contact at temperature T TLXDZ , calculate the ideal compensation ΔP LX The ideal operating pressure value P of the contact at temperature T TLXDZ Calculated based on the pressure-temperature characteristic relationship of the gas;

[0022] S108, based on the ideal compensation amount ΔP LX , compensation amount ΔP at temperature T and ideal compensation amount ΔP LX The compensation error ΔP WZ , and the contact action value P at room temperature 20DZCS , calculate the contact action value P at the temperature T 20TDZ ;

[0023] S110, using the contact action value P at the temperature T 20TDZ Perform simulation verification of the contacts of the gas density relay.

[0024] Furthermore, the ideal compensation amount ΔP is calculated according to the following formula: LX : ΔP LX =P 20DZCS -P TLXDZ .

[0025] Furthermore, the ideal operating pressure value P at temperature T is calculated according to the following formula: TLXDZ : P TLXDZ =F(T,P 20DZCS )

[0026] Wherein, F() indicates calculation based on the Bridgman equation.

[0027] Further, the contact action value P at temperature T is calculated according to the following formula 20TDZ : P 20TDZ = P 20DZCS - ΔP WZ .

[0028] According to another aspect of the present application, there is provided a simulation verification device for a gas density relay, the device comprising:

[0029] a data pre-detection module configured to acquire a simulation detection signal value P 20TFZ and a gas density value P 20TQT detected by a gas density detection sensor at temperature T;

[0030] a compensation amount calculation module configured to calculate a compensation amount ΔP at temperature T according to the simulation detection signal value P 20TFZ , the gas density value P 20TQT detected, a corresponding gas pressure value P TQT at temperature T, and a simulation detection signal value P 20FZCSX at normal temperature;

[0031] a contact action pressure value calculation module configured to calculate a contact action pressure value P 20DZCS at temperature T according to the compensation amount ΔP and a contact action value P TDZ at normal temperature;

[0032] a contact action value calculation module configured to calculate a contact action value P TDZ at temperature T according to the contact action pressure value P T20DZ at temperature T and a pressure-temperature characteristic relationship of the gas;

[0033] a simulation verification module configured to perform simulation verification of a contact of the gas density relay by using the contact action value P T20DZ at temperature T;

[0034] wherein the conversion according to the pressure-temperature characteristic relationship of the gas includes calculation by at least one of the Bethe-Bridgman equation, the Dalton partial pressure law or the ideal gas state equation.

[0035] In summary, the embodiment of the present application provides a simulation verification method and device for a gas density relay, the method comprising: obtaining a simulation detection signal value at temperature T and a gas density value detected by a gas density detection sensor; calculating a compensation amount at temperature T according to the simulation detection signal value, the detected gas density value, a corresponding gas pressure value at the temperature T, and a simulation detection signal value at normal temperature; calculating a contact action pressure value at the temperature T according to the compensation amount and a contact action value at normal temperature; converting the contact action pressure value at the temperature T to obtain a contact action value at the temperature T according to a pressure-temperature characteristic relationship of the gas; and performing simulation verification on a contact of the gas density relay by using the contact action value at the temperature T. The technical solution of the embodiment of the present application realizes verification on 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. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 is a schematic diagram of the working principle of a gas density relay related to the embodiment of the present application;

[0037] Fig. 2 is a structural schematic diagram of a simulation verification device for a gas density relay provided by the embodiment of the present application;

[0038] Fig. 3 is a flowchart of a simulation verification method for a gas density relay provided by the embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be given to the present application 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.

[0040] 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 with ordinary skills in the art to which the present application pertains, 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, number, or importance, but are only used to distinguish different components. The terms "include", "contain", and the like mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships can also change accordingly.

[0041] 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 tested, and can detect the SF6 gas density of the electrical equipment to be tested. The gas density relay can further comprise a microprocessor 71 and a power supply 72, i.e. the microprocessor 71 and the power supply 72 constitute a smart control unit 7. 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 tested through the pressure sensor 2 and the temperature sensor 3, and thus calculates the gas density of the electrical equipment to be tested through a preset calculation method. The gas density relay further comprises a driving contact action unit 5, a signal sampling unit 6, a smart 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 contacts of the gas density relay body 1 with a contact signal control loop, and the second connecting circuit connects the contacts of the gas density relay body 1 with the smart 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 and connects the second connecting circuit, so that the contacts of the gas density relay body 1 are connected with the smart 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 contacts 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, i.e. an intermediate relay with normally open and normally closed contacts. In a non-verification state, the normally closed contacts J11 and J12 are closed, and the normally open contacts J21 and J22 are disconnected, so that the gas density relay monitors the output state of the contacts PJ in real time. In a verification state, the normally closed contacts J11 and J12 are disconnected, and the normally open contacts J21 and J22 are closed, so that the contacts PJ of the gas density relay body 1 are connected with the smart 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 smart 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 a lockout signal according to the measured gas density value (for example, when the detected gas density is lower than a first threshold value, the alarm contact acts to output an alarm signal, and when the detected gas density is lower than a second threshold value, the lockout contact acts to output a lockout signal). The simulation detection unit 8 can be a simulation signaler, an angle sensor, a position sensor, or a photoelectric sensor. In this embodiment of the present application, the simulation detection unit 8 adopts a simulation signaler, 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 signaler 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 magnetic angle 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 in this embodiment of the present application, a switching value signal is adopted as the simulation detection signal. The simulation detection unit 8 can adopt an electric contact, for example, a common electric contact or a magnetic assisted electric contact. The driving contact action unit 5 is configured to output a driving signal to drive the simulation detection unit 8 to output the 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 the driving contact action unit 5 (for example, natural temperature change fluctuation, which can also include heating or pressure regulation, etc.).

[0042] The structure of the simulation checking device of the gas density relay provided by the embodiment of the present application is shown in Fig. 2. As shown in Fig. 2, the device comprises a 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 comprises 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 point signals), 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 are connected with the smart control unit 7 respectively, and the 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 this embodiment, the simulation detection unit 8 adopts an electric contact point, which is usually a common electric contact point or a magnetic assisted electric contact point. 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 is arranged in front of the scale disc 107, and the pointer 106 displays the gas density value in combination with the scale disc 107. The signal generator 109 comprises a magnetic assisted electric contact point or a micro switch, and the gas density relay body 1 outputs the contact point signals through the signal generator 109. The pressure detection element 103 comprises a Baratron or a bellows, and in this embodiment, the Baratron is adopted. The temperature compensation element 104 adopts a temperature compensation sheet or a gas enclosed in the shell, and in this embodiment, the temperature compensation sheet is adopted. The gas density relay body 1 of this 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 meter. 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 this 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.In the example shown in Fig. 2, three pairs of magnetic assisted electric contacts are adopted, one pair as the alarm contact signal, another pair as the lockout contact signal, and the third pair as the simulation detection unit 8 which outputs a switching value signal as the simulation detection signal when the monitored gas density changes to the set value. The simulation detection unit 8 is arranged on the magnetic assisted electric contacts of the gas density relay (e.g. the signal generator 109), which outputs a switching value signal as the simulation detection signal to the intelligent control unit 7 when the monitored gas density changes to the set value, as shown in Fig. 1, and the intelligent control unit 7 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) when the signal is collected. That is, the intelligent control unit 7 is connected to 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 the previously set (stored) temperature of 20°C and the monitored simulation detection signal value to obtain the new (or real-time) contact action value at this time through calculation according to the relevant characteristic relationship, thereby completing the simulation verification of the density relay. 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 by the driving contact action unit 5 (e.g. natural temperature fluctuation, which can also include heating or pressure regulation, etc.) to output the simulation detection signal. The driving contact action unit 5 includes a heating element 51 and a heat preservation member 52, which are arranged on the housing 101 of the gas density relay. As shown in Fig. 1, in the circuit, the driving contact action unit 5 is connected to the intelligent control unit 7, that is, the heating element 51 of the driving contact action unit 5 can be turned on by the intelligent control unit 7 to make the heating element 51 heat the temperature compensation element 104 of the gas density relay, so as to drive the simulation detection unit 8 to output a switching value signal as the simulation detection signal to the intelligent control unit 7. 20DZCS and the simulation detection signal value at the temperature of 20°C 20FZCS and the monitored simulation detection signal value, according to the relevant characteristic relationship, through calculation to obtain the new (or real-time) contact action value at this time, thereby completing the simulation verification of the density relay. 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 by the driving contact action unit 5 (e.g. natural temperature fluctuation, which can also include heating or pressure regulation, etc.) to output the simulation detection signal. The driving contact action unit 5 includes a heating element 51 and a heat preservation member 52, which are arranged on the housing 101 of the gas density relay. As shown in Fig. 1, in the circuit, the driving contact action unit 5 is connected to the intelligent control unit 7, that is, the heating element 51 of the driving contact action unit 5 can be turned on by the intelligent control unit 7 to make the heating element 51 heat the temperature compensation element 104 of the gas density relay, so as to drive the simulation detection unit 8 to output a switching value signal as the simulation detection signal to the intelligent control unit 7.

[0043] In this embodiment, the simulation detection unit 8 can also use an angle sensor, and the angle sensor of the simulation detection unit 8 is connected with the rear end of the central shaft of the movement 105. For example, the angle sensor uses a magnetic angle sensor, that is, a magnetic element is arranged at the rear end of the central shaft in the movement, the magnetic element corresponds to a matched magnetic angle encoder, and the magnetic angle encoder is in non-contact magnetic association with the pointer. The motion position of the pointer can be monitored by the magnetic angle encoder, and the monitored position parameter (angle displacement value) is transmitted to the intelligent control unit 7. In this way, the intelligent control unit 7 can monitor the simulation detection signal value P in real time through the simulation detection unit 8 20TFZ The movement 105 is fixed on the base 102, the other end of the temperature compensation element 104 is connected with the movement 105, the pointer 106 is installed on the movement 105 and arranged in front of the scale disc 107, and the pointer 106 displays the gas density value in combination with the scale disc 107.

[0044] The signal generator 109 includes a magnetic auxiliary electric contact or a micro switch, the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detection element 103 includes a Baratron tube or a bellows, and in this embodiment, a Baratron tube is used; the temperature compensation element 104 uses a temperature compensation sheet or a gas enclosed in the shell, and in this embodiment, a temperature compensation sheet is used. The gas density relay body 1 of this embodiment can also include an oil-filled density relay, an oil-free density relay, a gas density meter, a gas density switch or a gas pressure gauge.

[0045] The simulation detection unit 8 is arranged on the inner shell of the shell 101, and the simulation detection unit 8 is an angle sensor (or a position sensor or a photoelectric sensor), a simulation signal generator. In this embodiment, the simulation detection unit 8 uses an angle sensor, which is configured to output a simulation detection signal when the monitored gas density of the gas density relay body 1 changes. The circuit is shown in FIG. 1, and 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 connection of the heating element 51 of the driving contact action unit 5, so that the heating element 51 heats the temperature compensation element 104 of the gas density relay, and promotes the simulation detection unit 8 to output a position parameter (angle displacement value) signal as a simulation detection signal to the intelligent control unit 7. Of course, the simulation detection signal includes one of an on-off signal, a digital signal and an analog signal, and in this embodiment, a digital signal or an analog signal is used.

[0046] The working principle is: specifically, the intelligent control unit 7 (or background) sets (stores) the contact action value P at a temperature of 20°C 20DZCS ; and the intelligent control unit 7 (or background) sets (stores) the corresponding simulation detection signal value P 20QT of different densities (pressures) P 20FZCS at a normal temperature (for example, 20°C). The intelligent control unit 7 is connected with the gas density detection sensor (i.e. pressure sensor 2 and temperature sensor 3) and the simulation detection unit 8, 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, combines the contact action value P 20DZCS at a normal temperature (for example, 20°C) and the corresponding simulation detection signal value P 20QT of different densities (pressures) P 20FZCS at a normal temperature (for example, 20°C) set (stored) in advance, and the monitored simulation detection signal value, to obtain the new (or real-time) contact action value at this time through calculation according to the relevant characteristic relationship, thereby completing the simulation verification of the density relay.

[0047] The calculation processing method is: the intelligent control unit 7 monitors the simulation detection signal value P 20TFZ , and the gas density detection sensor (i.e. pressure sensor 2 and temperature sensor 3) monitors the temperature T converted into the corresponding gas density pressure value P 20TQT at 20°C, and the corresponding gas pressure value P TQT and temperature value T. The intelligent control unit 7 (or background) can obtain the corresponding simulation detection signal value P 20TQT when the gas density value is P 20FZCSX at a temperature of 20°C. The compensation amount ΔP = P 20TFZ + P 20TQT -P TQT -P 20FZCSX at T temperature is obtained. Then the contact action pressure value P TDZ at T temperature is obtained = P 20DZCS - ΔP = P 20DZCS + P TQT -P 20TFZ + P 20FZCSX -P 20TQT ; then according to the calculated P TDZ value and temperature value T, and according to the pressure-temperature characteristic relationship of the gas, the action value P 20TDZ at the contact T temperature (P 20TDZ = F (T, P TDZ )) is converted, thereby completing the contact simulation verification of the density relay.

[0048] FIG3 shows a flow chart of the simulation verification method of the gas density relay. The gas density relay includes a gas density relay body and a gas density detection sensor. The specific working principle is shown in FIG1. ​​The simulation verification method of the gas density relay according to the embodiment of the present invention includes the following steps:

[0049] S102, obtaining the simulation detection signal value P at temperature T 20TFZ And the gas density value P detected by the gas density detection sensor 20TQT When the gas density relay leaves the factory, the contacts and simulation signal action value tests of the gas density relay are carried out at room temperature (for example, 20°C), and the gas density values ​​P detected by the gas density detection sensor at each temperature are obtained. 20TQT And the corresponding simulation detection signal value P at room temperature 20FZCSX , list or save in other ways; when calibration is required, the gas density value P detected by the gas density detection sensor at the temperature 20TQT For example, by looking up the table, the corresponding simulation detection signal value P at room temperature is obtained. 20FZCSX . Simulation detection signal value P 20TFZ The signal 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.

[0050] S104, according to the simulation detection signal value P 20TFZ , Detected gas density value P 20TQT , the gas pressure value P corresponding to the temperature T TQT , and the simulated detection signal value P at room temperature 20FZCSX , calculate the compensation amount ΔP at temperature T. In this step, the compensation amount ΔP can be calculated according to the following formula: ΔP=P 20TFZ +P 20TQT -P TQT -P 20FZCSX .

[0051] S106, based on the compensation amount ΔP and the contact action value P at normal temperature 20DZCS The contact action value includes the alarm contact action value and the locking contact action value. Calculate the contact action pressure value P at temperature T. TDZ The contact action pressure value P at temperature T can be calculated according to the following formula TDZ : P TDZ =P 20DZCS -ΔP.

[0052] S108, according to the contact action pressure value P at the temperature T TDZ The contact action value P at the temperature T is obtained by converting the pressure-temperature characteristic relationship of the gas. T20DZThe contact action value P at temperature T can be calculated according to the following formula 20DZT 20DZT = F(T, P TDZ );

[0053] F() represents calculation according to the Beattie-Bridgman equation, and the Beattie-Bridgman equation is as follows: p = (RTB - A)d 2 + RTd A = 73.882 x 10 -5 - 5.132105 x 10 -7 d B = 2.50695 x 10 -3 - 2.12283 x 10 -6 d R = 56.9502 x 10 -5

[0054] In the formula, p represents absolute pressure (x 0.1 MPa), d represents density (kg / m 3 ), and T represents temperature (K). For SF6 / N2 mixed gas, the state equation of SF6 / N2 mixed gas can also be calculated by using the Dalton partial pressure law, the Beattie-Bridgman equation, and the ideal gas state equation.

[0055] S110, the contact action value P T20DZ is simulated and checked for the gas density relay.

[0056] The following describes a gas density relay with specific parameters as an example. For example, for a gas density relay with the following parameters: a rated pressure value of 0.6 MPa, an alarm pressure value of 0.55 MPa, and a lockout pressure value of 0.50 MPa. It is assumed that, when leaving the factory, the gas density relay is tested for the alarm and lockout contact action values (the contact action of the gas density relay is divided into alarm action and lockout action) and the simulation detection signal values corresponding to different density (pressure) values at a temperature of 20°C in a 20°C environment. It is assumed that the alarm contact action value P 20BJDZCS = 0.5553 MPa and the lockout contact action value P 20BSDZCS = 0.5065 MPa at 20°C. At the same time, the simulation detection signal values P 20QT corresponding to different density (pressure) values P 20FZCSX at 20°C are tested. The test results are shown in part of Table 1.

[0057] Table 1

[0058] and the simulation detection signal values P 20QT corresponding to different density (pressure) values P 20FZCSX ​The test data list is stored in the intelligent control unit 7 (or the upper computer). After the gas density relay runs for a period of time, the gas density relay in operation assumes that the intelligent control unit 7 receives the pressure value and temperature value of the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3), and converts to obtain the density value P of the gas chamber of the electrical equipment at the present moment 20XZ The gas density value of the electrical equipment can be monitored in real time. The contact of the density relay can be 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 (natural temperature fluctuation, etc., which can also include heating or pressure regulation). Assuming that the ambient temperature T = -15.56℃, the simulation detection signal value P TFZ monitored by the simulation detection unit 8 is 0.617MPa, and the gas density value P 20TQT monitored by the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3) is 0.605MPa, and the corresponding gas pressure value P TQT is 0.5003MPa, and the temperature value T = -15.56℃. The intelligent control unit 7 (or the upper computer) can obtain the gas density value P 20TQT is 0.605MPa, and the temperature is 20℃. The corresponding simulation detection signal value P 20FZCSX is 0.609MPa. The compensation amount ΔP at the temperature T (= -15.56℃) can be calculated as follows: ΔP = P 20TFZ + P 20TQT -P TQT -P 20FZCSX = 0.617 + 0.605 - 0.5003 - 0.609 = 0.1127MPa

[0059] Further, the alarm contact action pressure value P TBJDZ at the temperature T is obtained: P TBJDZ = P 20BJDZCS - ΔP = 0.5553 - 0.1127 = 0.4426MPa

[0060] Then, according to the obtained alarm contact action pressure value P TBJDZ at the temperature T and the temperature value T (= -15.56℃), and according to the pressure-temperature characteristic relationship of the gas, specifically, according to the Beattie-Bridgman equation, i.e. the SF6 gas state parameter Beattie-Bridgman formula can be used for conversion, the alarm contact action value P 20BJDZT at the temperature T (= -15.56℃) is converted as follows: P 20BJDZT = F(T, P TBJDZ ) = F(-15.56℃, 0.4426MPa) = 0.5350MPa

[0061] Further, the alarm contact action value P 20BJDZT The simulation verification of the alarm contact of the gas density relay is completed, that is, the simulation verification of the alarm contact at temperature T.

[0062] Similarly, the simulation calculation method for the latching contact is similar:

[0063] The compensation amount ΔP = 0.1127 MPa at temperature T (= -15.56°C) is obtained, and further the latching contact action pressure value P TBSDZ at temperature T is obtained. TBSDZ = P 20BSDZCS - ΔP = 0.5065 - 0.1127 = 0.3938 MPa

[0064] Then the obtained P TBSDZ and the temperature value T (= -15.56°C), 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, and the latching contact action value P 20BSDZT at temperature T (= -15.56°C) is obtained. 20BSDZT = F(T, P TBSDZ ) = F(-15.56°C, 0.3938 MPa) = 0.4762 MPa

[0065] Further, the latching contact action value P 20BSDZT The simulation verification of the latching contact of the gas density relay is completed, that is, the simulation verification of the latching contact at temperature T.

[0066] In addition, the simulation detection signal value P 20TFZ is 0.617 MPa, the temperature value T = -15.56°C, and the gas density value P 20TQT monitored by the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3) is 0.605 MPa, and the corresponding gas pressure value P TQT is 0.5003 MPa, that is, the gas density value P 20TQTThe simulated detection signal value is 0.605MPa, and the temperature T is -15.56℃ is 0.617MPa. This value can also be used as a basis for judging the performance of the density relay. The performance of the gas density relay can be judged based on the historical data before and after, and at different temperature values. The performance change trend and aging trend of the density relay can be judged. Specifically, the data before and after monitoring can be compared, such as the most recent test data Pn, the previous corresponding test data Po, and the time interval ΔT before and after the test, to obtain the data change ΔPb before and after the test, ΔPb = Pn-Po, and the data change speed ΔVp = (Pn-Po) / ΔT. According to the data change ΔPb and the data change speed ΔVp, the performance of the gas density relay can be judged. In addition, its service life can be known based on the maximum allowable change.

[0067] According to an embodiment of the present invention, a simulation verification method for a gas density relay is also provided, the method comprising the following steps:

[0068] S202, obtaining the simulation detection signal value P at temperature T 20TFZ And the gas density value P detected by the gas density detection sensor 20TQT As in the above embodiment, the gas density value P detected by the gas density detection sensor at each temperature is detected in advance. 20TQT And the corresponding simulation detection signal value P at room temperature 20FZCSX , list or save in other ways; when calibration is required, the gas density value P detected by the gas density detection sensor at the temperature 20TQT For example, by looking up the table, the corresponding simulation detection signal value P at room temperature is obtained. 20FZCSX .

[0069] S204, according to the simulation detection signal value P 20TFZ , Detected gas density value P 20TQT , the gas pressure value P corresponding to the temperature T TQT , and the simulated detection signal value P at room temperature 20FZCSX , calculate the compensation amount ΔP at temperature T. In this step, the compensation amount ΔP can be calculated according to the following formula: ΔP=P 20TFZ +P 20TQT -P TQT -P 20FZCSX .

[0070] In this embodiment, the first two steps of the simulation verification method of the gas density relay are the same as those of the above embodiment of the present invention, and further include the following steps:

[0071] S206, according to the contact action value P at normal temperature 20DZCSThe ideal operating pressure value P of the contact at temperature T TLXDZ , calculate the ideal compensation ΔP LX The ideal operating pressure value P of the contact at temperature T TLXDZ It is converted based on the pressure-temperature characteristic relationship of the gas. The ideal compensation amount ΔP can be calculated according to the following formula LX : ΔP LX =P 20DZCS -P TLXDZ .

[0072] The ideal operating pressure value P at temperature T is calculated according to the following formula: TLXDZ : P TLXDZ =F(T,P 20DZCS )

[0073] Where F() indicates calculation based on the Betty-Bridgeman equation.

[0074] S208, based on the ideal compensation amount ΔP LX , compensation amount ΔP at temperature T and ideal compensation amount ΔP LX The compensation error ΔP WZ , and the contact action value P at room temperature 20DZCS , calculate the contact action value P at the temperature T 20TDZ The contact action value P at temperature T can be calculated according to the following formula: 20TDZ : P 20TDZ =P 20DZCS -ΔP WZ .

[0075] S210, using the contact action value P at the temperature T 20TDZ Conduct simulation verification of the contacts of the gas density relay. WZ =ΔP-ΔP LX .

[0076] The following is an example of a density relay with specific parameters. For example, the parameters of a gas density relay are: rated pressure value 0.6Mpa, alarm pressure value 0.55MPa, and locking pressure value 0.50MPa. For example, when the gas density relay leaves the factory in a 20℃ environment, the alarm and locking contact action values, as well as the simulated detection signal values ​​corresponding to different density (pressure) values ​​at 20℃ are tested. The alarm contact action value P in a 20℃ environment is 20BJDZCS is 0.5553MPa, the locking contact action value P 20BSDZCS It is 0.5065MPa.

[0077] At the same time, different densities (pressures) P at a temperature of 20°C 20QTThe corresponding simulation detection signal value P 20FZCSX The test results are the same as listed in the above examples, as shown in Table 1 above.

[0078] The different densities (pressures) P 20QT The corresponding simulation detection signal value P 20FZCSX The test data list or other ways are pre-stored in the intelligent control unit 7 (or the upper computer), and are obtained by looking up the table when needed. After a period of operation of the gas density relay, the gas density relay in operation receives the pressure value and temperature value of the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3) in the field, such as the intelligent control unit 7, and converts to obtain the density value P of the electrical equipment at the current time 20XZ The gas density value of the electrical equipment can be monitored in real time. The contact of the gas density relay is simulated and verified, and the simulation detection unit 8 can be driven to output the simulation detection signal by driving the contact action unit 5 (natural temperature change fluctuation, etc., which can also include heating or pressure regulation). For example, when the ambient temperature T = -15.56℃, the simulation detection signal value P 20TFZ is 0.617MPa, and the gas density value P 20TQT monitored by the gas density detection sensor (i.e. the pressure sensor 2 and the temperature sensor 3) is 0.605MPa, and the corresponding gas pressure value P TQT is 0.5003MPa, and the temperature value T = -15.56℃. The gas density value P 20TQT can be obtained by looking up the table, for example, when the temperature is 20℃, the corresponding simulation detection signal value P 20FZCSX is 0.605MPa, the compensation amount ΔP at T temperature can be obtained: ΔP = P 20TFZ + P 20TQT - P TQT - P 20FZCSX = 0.617-0.5003+0.605-0.609 = 0.1127MPa

[0079] For the alarm contact, according to the alarm contact action value P 20BJDZCS at 20℃, the temperature T, and the ideal action pressure value P TLXBJDZ of the alarm contact at T temperature obtained according to the pressure-temperature characteristic relationship of the gas: P TLXBJDZ = F(T, P 20BJDZCS ) = 0.4594MPa

[0080] The specific calculation process is, according to the temperature T and the corresponding P 20BJDZCSThe ideal action pressure value P can be converted according to the Betty-Bridgeman equation TLXBJDZ .

[0081] Then we can get the ideal compensation value ΔP of the alarm contact. LXBJ : ΔP LXBJ =P 20BJDZCS -P TLXBJDZ =0.5553-0.4594=0.0959MPa

[0082] Then we can get the alarm contact compensation error ΔP WZBJ : ΔP WZBJ =ΔP-ΔP LXBJ =0.1127-0.0959=0.0168MPa

[0083] Thus, the alarm contact action value P at temperature T (=-15.56°C) can be obtained. 20TBJDZ : P 20TBJDZ =P 20BJDZCS -ΔP WZBJ =0.5553-0.0168=0.5385MPa

[0084] Use the alarm contact action value P 20TBJDZ It can realize the simulation verification of the alarm contact of the gas density relay. That is, at the temperature value T, the alarm contact action value of the density relay is P 20TBJDZ .

[0085] Similarly, for the latching contact, the ideal operating pressure value P of the latching contact at temperature T can be calculated based on the latching contact operating value at 20°C (=0.5065MPa) and temperature T (=-15.56°C) according to the pressure-temperature characteristic relationship of the gas. TLXBSDZ : P TLXBSDZ =F(T,P 20BSDZCS )=0.4190MPa

[0086] Then we can get the ideal compensation value ΔP of the locking contact LXBS : ΔP LXBS =P 20BSDZCS -P TLXBSDZ =0.5065-0.4190=0.0875MPa

[0087] Then we can get the locking contact compensation error ΔP WZBS : ΔP WZBS =ΔP-ΔP LXBS =0.1127-0.0875=0.0252MPa

[0088] Thus, the closed contact action value P at the closed contact temperature T (= -15.56℃) can be obtained 20TBSDZ : P 20TBSDZ = P 20BSDZCS - ΔP WZBS = 0.5065 - 0.0252 = 0.4813 MPa

[0089] Using the closed contact action value P 20TBSDZ , the simulation check of the closed contact of the gas density relay can be realized. That is, the closed contact action value of the density relay at the temperature T is P 20TBSDZ .

[0090] The embodiment of the present application also provides a simulation check device of a gas density relay, which comprises:

[0091] a data pre-detection module, configured to acquire the simulation detection signal value P 20TFZ at the temperature T and the gas density value P 20TQT detected by the gas density detection sensor;

[0092] a compensation amount calculation module, configured to calculate the compensation amount ΔP at the temperature T according to the simulation detection signal value P 20TFZ , the gas density value P 20TQT , the corresponding gas pressure value P TQT at the temperature T, and the simulation detection signal value P 20FZCSX at normal temperature;

[0093] a contact action pressure value calculation module, configured to calculate the contact action pressure value P 20DZCS at the temperature T according to the compensation amount ΔP and the contact action value P TDZ at normal temperature;

[0094] a contact action value calculation module, configured to calculate the contact action value P TDZ at the temperature T according to the contact action pressure value P T20DZ at the temperature T and the pressure-temperature characteristic relationship of the gas;

[0095] a simulation check module, configured to perform the simulation check of the contact of the gas density relay by using the contact action value P T20DZ at the temperature T;

[0096] Wherein, the conversion according to the pressure-temperature characteristic relationship of the gas includes, but is not limited to, the calculation by the Bethe-Bridgman equation. For the SF6 / N2 mixed gas, the state equation of the SF6 / N2 mixed gas can also be calculated by using the Dalton partial pressure law, the Bethe-Bridgman equation and the ideal gas state equation.

[0097] The specific way in which each module in the simulation verification device of the gas density relay in this embodiment achieves its function is the same as the steps of the simulation verification method of the gas density relay in the above-mentioned embodiments, and the repeated description thereof will be omitted here.

[0098] 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 at temperature T and a gas density value detected by a gas density detection sensor; calculating a compensation amount at temperature T according to the simulation detection signal value, the detected gas density value, a corresponding gas pressure value at the temperature T, and a simulation detection signal value at normal temperature; calculating a contact action pressure value at the temperature T according to the compensation amount and a contact action value at normal temperature; converting the contact action pressure value at the temperature T to obtain a contact action value at the temperature T according to a pressure-temperature characteristic relationship of the gas; and performing simulation verification of a contact of the gas density relay by using the contact action value at the temperature T. The technical solution of the embodiment of the present application uses a simulation detection signal to verify the gas density relay, 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.

[0099] 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 on 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 verification method for a gas density relay, wherein the gas density relay comprises a gas density relay body and a gas density detection sensor, characterized in that: The method comprises: S102, obtaining the simulation detection signal value P at temperature T 20TFZ And the gas density value P detected by the gas density detection sensor 20TQT ; S104, according to the simulation detection signal value P 20TFZ , Detected gas density value P 20TQT , the gas pressure value P corresponding to the temperature T TQT , and the simulated detection signal value P at room temperature 20FZCSX , calculate the compensation amount ΔP at temperature T; S106, based on the compensation amount ΔP and the contact action value P at normal temperature 20DZCS , calculate the contact action pressure value P at temperature T TDZ ; S108, according to the contact action pressure value P at the temperature T TDZ The contact action value P at the temperature T is obtained by converting the pressure-temperature characteristic relationship of the gas. 20DZT ; S110, using the contact action value P at the temperature T 20DZT Perform simulation verification of the contacts of the gas density relay.

2. The method according to claim 1, characterized in that The compensation amount ΔP is calculated according to the following formula: ΔP=P 20TFZ +P 20TQT -P TQT -P 20FZCSX 。 3. The method according to claim 1, characterized in that Pre-detect different gas density values ​​P at room temperature 20TQT and the corresponding simulation detection signal value P 20FZCSX and save; According to the gas density value P detected by the gas density detection sensor at temperature T 20TQT Get the corresponding simulation detection signal value P at room temperature 20FZCSX .

4. The method according to any one of claims 1 to 3, characterized in that Calculate the contact action pressure value P at temperature T according to the following formula TDZ : P TDZ =P 20DZCS -ΔP。 5. The method according to claim 4, characterized in that Calculate the contact action value P at temperature T using the following formula T20DZ : P T20DZ =F(T,P TDZ ) Wherein, F() indicates calculation according to at least one of the Betty-Bridgeman equation, Dalton's law of partial pressures, or the ideal gas state equation.

6. The method according to any one of claims 1 to 3, characterized in that The method further comprises: S106, according to the contact action value P at normal temperature 20DZCS The ideal operating pressure value P of the contact at temperature T TLXDZ , calculate the ideal compensation ΔP LX The ideal operating pressure value P of the contact at temperature T TLXDZ Calculated based on the pressure-temperature characteristic relationship of the gas; S108, based on the ideal compensation amount ΔP LX , compensation amount ΔP at temperature T and ideal compensation amount ΔP LX The compensation error ΔP WZ , and the contact action value P at room temperature 20DZCS , calculate the contact action value P at the temperature T 20TDZ ; S110, using the contact action value P at the temperature T 20TDZ Perform simulation verification of the contacts of the gas density relay.

7. The method according to claim 6, characterized in that Calculate the ideal compensation amount ΔP according to the following formula LX : ΔP LX =P 20DZCS -P TLXDZ 。 8. The method according to claim 7, characterized in that Calculate the ideal operating pressure value P at temperature T according to the following formula TLXDZ : P TLXDZ =F(T,P 20DZCS ) Wherein, F() indicates that the calculation is performed based on the Betty-Bridgeman equation.

9. The method according to claim 8, characterized in that Calculate the contact action value P at temperature T using the following formula 20TDZ : P 20TDZ =P 20DZCS -ΔP WZ 。 10. A simulation calibration device for a gas density relay, characterized in that: The device comprises: Data pre-detection module, used to obtain the simulation detection signal value P at temperature T 20TFZ And the gas density value P detected by the gas density detection sensor 20TQT ; The compensation amount calculation module is used to calculate the value of the simulation detection signal P 20TFZ , Detected gas density value P 20TQT , the gas pressure value P corresponding to the temperature T TQT , and the simulated detection signal value P at room temperature 20FZCSX , calculate the compensation amount ΔP at temperature T; The contact action pressure value calculation module is used to calculate the contact action pressure value according to the compensation amount ΔP and the contact action value P at normal temperature. 20DZCS , calculate the contact action pressure value P at temperature T TDZ ; The contact action value calculation module is used to calculate the contact action pressure value P at the temperature T. TDZ The contact action value P at the temperature T is obtained by converting the pressure-temperature characteristic relationship of the gas. T20DZ ; The simulation verification module is used to use the contact action value P at the temperature T T20DZ Conduct simulation verification of contacts of gas density relay; The conversion based on the pressure-temperature characteristic relationship of the gas includes calculating by at least one of the Betty-Bridgeman equation, Dalton's law of partial pressures, or the ideal gas state equation.

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