A simulation calibration method and device for gas density relay

Abstract

The embodiment of the present invention relates to a simulation verification method and device for a gas density relay, the method comprising: obtaining a simulation detection signal value of the gas density relay at temperature T, and obtaining a compensation amount at temperature T; obtaining a contact action pressure value of the gas density relay at temperature T according to the compensation amount and the contact action value of the gas density relay at room temperature; converting the action value of the gas density relay at temperature T according to the contact action pressure value, temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured; and verifying the gas density relay according to the action value. The technical solution of the embodiment of the present invention uses a simulation detection signal to realize the verification of the gas density relay, without disassembling the gas density relay, the detection process is safe and does not require manual intervention, and the obtained verification result has high accuracy.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power equipment monitoring, and in particular to a simulation verification method and device for a gas density relay. Background Art

[0002] Power equipment is an important material basis for ensuring the safe operation of the power grid and the reliable supply of electricity. With the development of the economy, the capacity of the power system has expanded dramatically, and the use of related equipment has soared. It is becoming increasingly important to ensure the safe and reliable operation of the power system. As an excellent insulating / arc-extinguishing gas, SF6 is widely used in the high-voltage field. At present, 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 insulation / arc-extinguishing performance. If leakage occurs during use, it will have a significant impact on the safe and reliable operation of power equipment.

[0003] At present, there are some problems in the use of commonly used mechanical density relays. For example, the contacts of the SF6 gas density relay installed on site often oxidize due to long-term inaction, and the mechanism is stuck and damaged, resulting in the failure to issue alarm / lockout signals, which makes the operation and maintenance personnel unable to find problems in time. The following problems exist in the regular verification of SF6 gas density relays: There are many SF6 electrical equipment, and the annual regular verification costs huge manpower and material resources. For some old substation equipment that has not been renovated, there is no verification interface designed due to the age. The density relay needs to be disassembled on site during verification. The disassembly process is inefficient, and the original sealing performance may be damaged, resulting in gas leakage; some density relays are installed at a high position, and it is difficult to disassemble or verify on site, which poses a safety hazard; in addition, the data in the verification process is manually transcribed, which is very easy to be missed or written wrongly; and some renovated or newly built stations use non-disassembly methods for on-site verification, which requires disassembly of electrical signal circuits. When working with power, it is easy to cause false alarms or lockout signals to enter the relay protection, making the circuit breaker unable to operate normally, and in serious cases, it will cause serious accidents. Summary of the invention

[0004] Based on the above situation of the prior art, the purpose of the embodiments of the present invention is to provide a simulation verification method and device for a gas density relay, which utilizes a simulated detection signal to realize the verification of the gas density relay without disassembling the gas density relay. The detection process is safe and does not require human intervention, and the obtained verification result is highly accurate.

[0005] To achieve the above object, according to one aspect of the present invention, a simulation verification method for a gas density relay is provided, the method comprising:

[0006] Get the simulated detection signal value P of the gas density relay at temperature T TFZDZAccording 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;

[0007] 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 PT BSDZ ;

[0008] 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 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 ;

[0009] According to the alarm action value P 20BJDZT and / or blocking action value P 20BSDZT Calibrate the gas density relay;

[0010] Among them, P 20DZCS and / or P 20FZCS The gas density relay is obtained in advance 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 tested includes calculation through the Betty-Bridgeman equation.

[0011] Furthermore, 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.

[0012] Furthermore, the compensation amount ΔP is calculated according to the following formula:

[0013] ΔP=P 20FZCS -P TFZDZ .

[0014] Furthermore, the alarm contact action pressure value P is calculated according to the following formulas: TBJDZ And / or locking contact action pressure value P TBSDZ :

[0015] P TBJDZ =P 20BJDZCS -ΔP

[0016] PTBSDZ =P 20BSDZCS -ΔP.

[0017] Furthermore, the method further comprises:

[0018] According to the alarm contact action value P of the gas density relay at normal 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 .

[0019] Further, 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 .

[0020] Furthermore, the ideal alarm compensation amount ΔP is calculated according to the following formulas: LXBJ and / or ideal locking compensation ΔP LXBS :

[0021] ΔP LXBJ =P 20BJDZCS -P TLXBJDZ

[0022] ΔP LXBS =P 20BSDZCS -P TLXBSDZ .

[0023] Further, 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 lock compensation error value ΔP WZBS :

[0024] ΔP WZBJ =ΔP-ΔP LXBJ

[0025] ΔP WZBS =ΔP-ΔP LXBS .

[0026] Furthermore, according to the alarm contact action value P of the gas density relay at room temperature 20BJDZCSAnd / or blocking contact action value P 20BSDZCS , and the alarm compensation error value ΔP WZBJ And / or lock compensation error value ΔP WZBS , get the alarm action value P of the gas density relay at temperature T 20BJDZT and / or blocking action value P 20BSDZT :

[0027] P 20BJDZT =P 20BJDZCS -ΔP WZBJ

[0028] P 20BSDZT =P 20BSDZCS -ΔP WZBS .

[0029] According to another aspect of the present invention, a simulation verification device for a gas density relay is provided, the device comprising:

[0030] The compensation calculation module is used to obtain 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;

[0031] The contact action pressure value calculation module is used to calculate the alarm contact action value P of the gas density relay at room temperature based on the compensation amount ΔP 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 ;

[0032] The action value calculation module is 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 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 ;

[0033] Among them, P 20DZCS and P 20FZCS The gas density relay is obtained in advance 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 tested includes calculation through the Betty-Bridgeman equation.

[0034] Furthermore, the device further comprises a verification module, which is used to verify the alarm action value P according to the alarm action value P. 20BJDZT and / or blocking action value P 20BSDZT The gas density relay is calibrated.

[0035] In summary, the embodiment of the present invention provides a simulation verification method and device for 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 the simulation detection signal value of the gas density relay at room temperature; obtaining an alarm contact action pressure value and a locking contact action pressure value of the gas density relay at temperature T according to the compensation amount and the alarm contact action value and the locking contact action value of the gas density relay at room temperature; converting the alarm contact action pressure value and the locking contact action pressure value, the temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured to obtain the alarm action value and the locking action value of the gas density relay at temperature value T; and verifying the gas density relay according to the alarm action value and the locking action value. The technical solution of the embodiment of the present invention uses a simulation detection signal to realize the verification of the gas density relay, without disassembling the gas density relay, the detection process is safe and does not require manual intervention, and the obtained verification result has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the working principle of the gas density relay involved in the embodiment of the present invention;

[0037] Figure 2 It is a structural schematic diagram of a simulation verification device for a gas density relay provided in an embodiment of the present invention;

[0038] Figure 3 It is a flow chart of a simulation verification method of a gas density relay provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0040] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of the present invention should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in one or more embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] The technical solution of the present invention is described in detail below with reference to the accompanying drawings. An embodiment of the present invention provides a simulation verification method for a gas density relay. Figure 1The working principle diagram of the gas density relay involved in the embodiment of the present invention is shown in the figure, the gas density relay includes a gas density relay body 1 and a gas density detection sensor, the gas density detection sensor includes, for example, a pressure sensor 2 and a temperature sensor 3, the gas density relay is connected to the electrical equipment to be tested, and the SF6 gas density of the electrical equipment to be tested can be detected. It also includes a microprocessor 71 and a power supply 72. The gas density relay body 1 includes a pointer for indicating the gas density, and 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, so as to calculate the gas density of the electrical equipment to be tested by a preset calculation method. The gas density relay also includes a 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 includes a first connection circuit and a second connection circuit, the first connection circuit connects the contact of the gas density relay body 1 and the contact signal control circuit, and the second connection circuit connects the contact of the gas density relay body 1 and the intelligent control unit 7. In the non-verification state, the second connection circuit is disconnected and the first connection circuit is closed; in the verification state, the signal sampling unit 6 cuts off the first connection circuit, connects the second connection circuit, and connects the contacts of the gas density relay body 1 to the intelligent control unit 7. The first connection circuit includes a first electromagnetic relay J1, and the second connection circuit includes a second electromagnetic relay J2. The first electromagnetic relay J1 is provided with normally closed contacts J11 and J12, and the normally closed contacts J11 and J12 are connected in series in the contact signal control loop; the second electromagnetic relay J2 is provided with normally open contacts J21 and J22, and the normally open contacts J21 and J22 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 combined into one, that is, an intermediate relay with normally open and normally closed contacts. In the non-verification state, the normally closed contacts J11 and J12 are closed, the normally open contacts J21 and J22 are disconnected, and 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, the normally open contacts J21 and J22 are closed, and 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 testing of the gas density relay can be realized through the intelligent control unit 7 and 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 outage 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 this embodiment of the present invention, the simulation detection unit 8 adopts a simulation signal device, which is configured to collect the monitored gas density of the gas density relay body 1 and when the gas density changes to a set value, the corresponding simulation signal device outputs a simulation detection signal.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 measuring device. The simulation detection signal includes one of a switch quantity signal, a digital quantity signal and an analog quantity signal. In this embodiment of the present invention, a switch quantity signal is used as the simulation detection signal. The simulation detection unit 8 can use an electric contact, such as a common electric contact or a magnetic auxiliary electric contact. Figure 2 FIG. 4 shows a schematic diagram of the structure of a simulation verification device for a gas density relay provided by an embodiment of the present invention. Figure 2As shown, the device includes: a gas density relay body 1, a gas density detection sensor (i.e., a pressure sensor 2 and a temperature sensor 3), an intelligent control unit 7, a simulation detection unit 8, and a communication unit 9. Among them, the pressure sensor 2, the temperature sensor 3, and the intelligent control unit 7 are arranged in the gas density relay body 1. In the gas path, the pressure sensor 2 of the gas density detection sensor is connected to 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 respectively connected to the intelligent control unit 7. Among them, the gas density relay body 1 includes a housing 101, and 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 signals), a signal action mechanism 111, a movement 105, a pointer 106, and a dial 107 arranged in the housing 101 of the gas density relay body 1. The simulation detection unit 8 and the communication unit 9 are arranged in the housing 101 of the gas density relay body 1, and are respectively connected to the intelligent control unit 7, and the antenna of the communication unit is arranged outside the housing 101. One end of the pressure detection element 103 is fixed on the base 102 and connected thereto, and the other end of the pressure detection element 103 is connected to one end of the temperature compensation element 104 through the end seat 108, and the other end of the temperature compensation element 104 is connected to the movement. The pointer is set at the front end of the central axis of the movement. In this embodiment, the simulation detection unit 8 adopts an electric contact, which is usually an ordinary electric contact or a magnetic-assisted electric contact. The movement 105 is fixed on the base 102; the other end of the temperature compensation element 104 is connected to the movement 105; the pointer 106 is installed on the movement 105 and is arranged in front of the dial 107, and the pointer 106 displays the gas density value in combination with the dial 107. The signal generator 109 includes a magnetically assisted electric contact or a micro switch, and the gas density relay body 1 outputs a contact signal through the signal generator 109; the pressure detection element 103 includes a Baden tube or a bellows, and a Baden tube is used in this embodiment; the temperature compensation element 104 uses a temperature compensation sheet or a gas enclosed in a shell, and a temperature compensation sheet is used in this embodiment. The gas density relay body 1 of this embodiment may 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. The simulation detection unit 8 is arranged on the inner shell of the shell 101, and the simulation detection unit 8 may be a simulation signal device, an angle sensor (or a position sensor, or a photoelectric sensor). In this embodiment, the simulation detection unit 8 uses a simulation signal device, which is configured to collect the monitored gas density of the gas density relay body 1. When the gas density changes to a set value, the corresponding simulation signal device outputs a simulation detection signal. Figure 2In the example shown, three pairs of magnetically assisted electric contacts are used, one pair as alarm contact signals, another pair as locking contact signals, and another pair as simulation detection units 8. When the monitored gas density changes to a set value, the simulation detection unit 8 outputs a switch signal as a simulation detection signal. The simulation detection unit 8 is set on the magnetically assisted electric contacts of the gas density relay (for example, the signal generator 109). When the monitored gas density changes to a set value, the simulation detection unit 8 outputs a switch signal as a simulation detection signal. Figure 1 As shown, the simulation detection unit 8 outputs a switch signal as a simulation detection signal to the intelligent control unit 7. When the intelligent control unit 7 collects the signal, it immediately collects data such as gas density value through the gas density detection sensor (i.e., pressure sensor 2 and temperature sensor 3). That is, the 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 signal 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 contact action value P at the pre-set (stored) temperature of 20°C. 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 obtained by calculation, thereby completing the simulation verification of the density relay. The contact action unit 5 is driven to output a drive signal, driving the simulation detection unit 8 to output a simulation detection signal. Fluctuations in ambient temperature, or the simulation detection unit 8 can be driven to output a simulation detection signal by driving the contact action unit 5 (such as natural temperature change fluctuations, and can also include heating or pressure regulation, etc.). The contact action unit 5 is driven to include a heating element 51 and a heat preservation component 52, and the heating element 51 and the heat preservation component 52 are respectively arranged on the housing 101 of the gas density relay. As shown Figure 1 As shown, 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 controlled by the intelligent control unit 7 to connect the circuit, so that the heating element 51 heats the temperature compensation element 104 of the gas density relay, prompting the simulation detection unit 8 to output a switch signal as a simulation detection signal to the intelligent control unit 7.

[0042] like Figure 1As shown, the intelligent control unit 7 is respectively 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, prompting the simulation detection unit 8 to output a switch signal as a simulation detection signal to the intelligent control unit 7. 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 measuring device. The simulation detection signal includes one of a switch signal, a digital signal, and an analog signal. The present embodiment adopts a switch signal. The setting 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 setting value of the simulation detection signal output by the simulation signal device = (90% to 110%) * Pe.

[0043] The working principle is as follows: Specifically, the intelligent control unit 7 (or background) is set (stored) with a contact action value P when the temperature is 20°C. 20DZCS ; The intelligent control unit 7 (or background) is set (stored) with a simulated detection signal value P when the temperature is 20°C 20FZCS The 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 signal 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 contact action value P set (stored) in advance. 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 can include the alarm contact action value and the locking contact action value. The alarm contact action value is expressed by 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 by P 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.

[0044] Figure 3 The flowchart of the simulation verification method of the gas density relay is shown in FIG. Figure 3 As shown, the method comprises the following steps:

[0045] S202, obtaining 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 , and obtain the compensation value ΔP at temperature T. Among them, the simulation detection signal value P TFZDZ It 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:

[0046] ΔP=P 20FZCS -P TFZDZ .

[0047] S204, according to the compensation amount ΔP and the alarm contact action value P of the gas density relay at normal 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 :

[0048] P TBJDZ =P 20BJDZCS -ΔP

[0049] P TBSDZ =P 20BSDZCS -ΔP.

[0050] S206, according to the alarm contact action pressure value P TBJDZ And the locking contact action pressure value P TBSDZ , temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured to obtain the alarm action value P of the gas density relay at the temperature value T 20BJDZT and blocking action value P 20BSDZT .

[0051] S208, according to the alarm action value P 20BJDZT and blocking action value P 20BSDZT Calibrate the gas density relay;

[0052] Among them, P 20DZCS and P 20FZCSThe gas density relay is obtained in advance by the contact action value test and the simulation signal action value test of the gas density relay at room temperature when the gas density relay leaves the factory; the conversion according to the pressure-temperature characteristic relationship of the gas to be measured includes calculation by the Betty-Bridgeman equation. In the embodiment of the present invention, the normal temperature condition refers to the ambient temperature condition of 20°C.

[0053] The following is an explanation using 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; the locking pressure value is 0.50MPa. The setting value of the simulation detection signal output by the simulation detection unit 8 is 0.58MPa (the setting value of the simulation detection signal output by the simulation signal device = (90%~110%)*Pe). When leaving the factory, the gas density relay is tested for alarm, locking contact action value, and simulation detection signal value at a temperature of 20℃ in an environment of 20℃. Assuming that the alarm contact action value P in an environment of 20℃ 20BJDZCS =0.5553MPa, locking contact action value P 20BSDZCS =0.5065MPa, simulation detection signal value P 20FZCS =0.5824M. And all these pre-tested data are stored in the intelligent control unit 7 (or the host computer). After the gas density relay has been running for a period of time, the gas density relay is in operation. It is assumed 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) on site, and converts them to obtain the gas density value P of the gas chamber of the electrical equipment at the current moment. 20XZ , the 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 can be monitored online. The contacts of the gas density relay are simulated and checked, and the contact action unit 5 can be driven to drive the simulation detection unit 8 to output a simulation detection signal. For example, when the contact action unit 5 is heated to a temperature of T = 51.43 ° C, the simulation detection unit 8 outputs a simulation detection signal, and the pressure value P at this time is TFZDZ =0.6802MPa, at this time, for the alarm contact alarm action value P 20BJDZT Algorithm: Get the compensation value ΔP at temperature T (=51.43℃):

[0054] ΔP=P 20FZCS -P TFZDZ =0.5824-0.6802=-0.0978MPa

[0055] Then we can get the alarm contact action pressure value P at temperature T (=51.43℃) TBJDZ :

[0056] P TBJDZ =P 20BJDZCS-ΔP=0.5553-(-0.0978)=0.6531MPa

[0057] Then according to the alarm contact action pressure value P TBJDZ And the temperature value T = 51.43 ° C, and then according to the pressure-temperature characteristic relationship of the gas, it can be specifically converted according to the Beattie-Bridgman equation, that is, the SF6 gas state parameter Beattie-Bridgman (Beattie-Bridgman) formula can be used, where the Beattie-Bridgman (Beattie-Bridgman) equation is shown as follows:

[0058] p=(RTB-A)d 2 +RTd

[0059] A=73.882×10 -5 -5.132105×10 -7 d

[0060] B=2.50695×10 -3 -2.12283×10 -6 d

[0061] R = 56.9502 × 10 -5

[0062] Where p represents absolute pressure (×0.1MPa); d represents density (kg / m 3 ), T represents temperature (K).

[0063] According to the Betty-Bridgeman equation, the action value P at the contact temperature T (=51.43°C) can be converted. 20BJDZT :

[0064] P 20BJDZT =F(T,P TBJDZ )=F(51.43℃, 0.6531MPa)=0.5666MPa

[0065] Then complete the simulation verification of the alarm contacts of the density relay.

[0066] For other gases, such as SF6 / N2 mixed gas, the SF6 / N2 mixed gas state equation can also be calculated using Dalton's partial pressure law, Betty-Bridgeman equation, and ideal gas state equation.

[0067] Similarly, for the simulation calculation algorithm of the locking contact, the compensation amount ΔP at temperature T (=51.43°C) is obtained:

[0068] ΔP=P 20FZCS -P TFZDZ=0.5824-0.6802=-0.0978MPa

[0069] Then we can get the locking contact action pressure value P at temperature T (=51.43℃) TBSDZ :

[0070] P TBSDZ =P 20BSDZCS -ΔP=0.5065-(-0.0978)=0.6043MPa

[0071] Then according to the locking contact action pressure value P TBSDZ =0.6043MPa and temperature value T=51.43℃, and then according to the pressure-temperature characteristic relationship of the gas, it can be specifically converted according to the Beattie-Bridgman equation, that is, the Beattie-Bridgman formula of SF6 gas state parameters can be used to convert the action value P at the contact point T (=51.43℃) 20BSDZT :

[0072] P 20BSDZT =F(T,P TBSDZ )=F(51.43℃, 0.6043MPa)=0.5243MPa

[0073] Then the simulation verification of the locking contacts of the density relay is completed.

[0074] In addition, according to the pressure value P TFZDZ =0.6802MPa, temperature T = 51.43℃, and then convert it according to the Betty-Bridgeman equation to get its P 20TFZDZ :

[0075] P 20TFZDZ =F(T,P TFZDZ )=F(51.43℃, 0.6802MPa)=0.59MPa

[0076] That is, the simulated detection signal value at temperature T (=51.43℃) is 0.59MPa. This value can also be used as a basis for judging the performance of the gas density relay. The intelligent control unit 7 (or background) can compare the historical data before and after to judge the performance of the density relay, and can judge the performance change trend and aging trend of the density relay. Specifically, it can be compared with the data before and after monitoring, such as the most recent test data Pn, the corresponding test data Po of the previous time, and the time interval ΔT between the previous and subsequent tests, so as to know the change amount ΔPb of the previous and subsequent data, ΔPb=Pn-Po, and the change speed of the previous and subsequent data ΔVp=(Pn-Po) / ΔT. The performance of the gas density relay can be judged based on the change amount ΔPb of the previous and subsequent data and the change speed ΔVp of the previous and subsequent data. Its service life can also be known based on the maximum allowable change amount.

[0077] In this way, the contacts of the density relay can be simulated and checked and diagnosed to ensure the performance of the density relay. When the simulated verification / diagnosis shows that the action value of the density relay contact exceeds the required error, an abnormal alarm message is sent to the background.

[0078] According to some optional embodiments, the method further comprises the following steps:

[0079] According to the alarm contact action value P of the gas density relay at normal temperature 20BJDZCS and the 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 the ideal locking action pressure value P TLXBSDZ .

[0080] According to the ideal alarm action pressure value P TLXBJDZ and the ideal locking action pressure value P TLXBSDZ , and the alarm contact action value P of the gas density relay at room temperature 20BJDZCS and the blocking contact action value P 20BSDZCS , calculate the ideal alarm compensation ΔP LXBJ and ideal locking compensation ΔP LXBS :

[0081] ΔP LXBJ =P 20BJDZCS -P TLXBJDZ

[0082] ΔP LXBS =P 20BSDZCS -P TLXBSDZ .

[0083] According to the compensation amount ΔP and the ideal alarm compensation amount ΔP LXBJand ideal locking compensation ΔP LXBS , respectively calculate the alarm compensation error value ΔP WZBJ And the locking compensation error value ΔP WZBS :

[0084] ΔP WZBJ =ΔP-ΔP LXBJ

[0085] ΔP WZBS =ΔP-ΔP LXBS .

[0086] According to the alarm contact action value P of the gas density relay at normal temperature 20BJDZCS and the blocking contact action value P 20BSDZCS , and the alarm compensation error value ΔP WZBJ And the locking compensation error value ΔP WZBS , get the alarm action value P of the gas density relay at temperature T 20BJDZT and blocking action value P 20BSDZT :

[0087] P 20BJDZT =P 20BJDZCS -ΔP WZBJ

[0088] P 20BSDZT =P 20BSDZCS -ΔP WZBS .

[0089] The following is an explanation using 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 locking pressure value is 0.50MPa. The setting value of the simulation detection signal output by the simulation detection unit 8 is 0.58MPa (the setting value of the simulation detection signal output by the simulation signal device = (90%~110%)*Pe). When leaving the factory, the gas density relay is tested for alarm, locking contact action value, and simulation detection signal value at a temperature of 20°C in an environment of 20°C. For example, its alarm contact action value P in an environment of 20°C 20BJDZCS =0.5553MPa, locking contact action value P 20BSDZCS =0.5065MPa, simulation detection signal value P 20FZCS =0.5824M. And all these pre-tested data are stored in the intelligent control unit 7 (or the host computer). After the gas density relay has been running for a period of time, the gas density relay is in operation. It is assumed 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) on site, and converts them to obtain the gas density value P of the gas chamber of the electrical equipment at the current moment. 20XZ, that is, the gas density value of electrical equipment can be monitored in real time.

[0090] The contact of the gas density relay is simulated and checked, and specifically, the contact action unit 5 is driven to drive the simulation detection unit 8 to output a simulation detection signal. For example, when the contact action unit 5 is heated to a temperature of T = 51.43 ° C, the simulation detection unit 8 outputs a simulation detection signal, and the pressure value P at this time TFZDZ =0.6802MPa, at this time, for the alarm contact alarm action value P 20BJDZT The algorithm is used to obtain the compensation value ΔP at temperature T (=51.43°C):

[0091] ΔP=P 20FZCS -P TFZDZ =0.5824-0.6802=-0.0978MPa

[0092] According to the alarm contact action value P at room temperature (20°C in this embodiment), 20BJDZCS And the temperature value T = 51.43 ° C, and then according to the pressure-temperature characteristic relationship of the gas, it can be specifically converted according to the Beattie-Bridgman equation, that is, the Beattie-Bridgman formula of the SF6 gas state parameter can be used to convert the ideal alarm action pressure value P of the contact at the temperature of T (= 51.43 ° C). TLXBJDZ :

[0093] P TLXBJDZ =0.6401MPa

[0094] Get the ideal alarm compensation ΔP LXBJ :

[0095] ΔP LXBJ =P 20BJDZCS -P TLXBJDZ =0.5553-0.6401=-0.0848MPa

[0096] Then we get the compensation error ΔP WZBJ :

[0097] ΔP WZBJ =ΔP-ΔP LXBJ =-0.0978-(-0.0848)=-0.013MPa

[0098] Thus, the alarm contact action value P of the contact at temperature T can be obtained. 20BJDZT :

[0099] P 20BJDZT =P 20BJDZCS -ΔP WZBJ=0.5553-(-0.013)=0.5683MPa

[0100] Then the simulation verification of the alarm contacts of the gas density relay is completed.

[0101] For the blocking contact blocking action value P 20BSDZT The algorithm is used to obtain the compensation value ΔP at temperature T (=51.43°C):

[0102] ΔP=P 20FZCS -P TFZDZ =0.5824-0.6802=-0.0978MPa

[0103] According to the contact locking action value P at room temperature (20°C in this embodiment), 20BSDZCS And the temperature value T = 51.43 ° C, and then according to the pressure-temperature characteristic relationship of the gas, it can be specifically converted according to the Beattie-Bridgman equation, that is, the SF6 gas state parameter Beattie-Bridgman (Beattie-Bridgman) formula can be used to convert the ideal locking action pressure value P of the contact at the temperature of T (= 51.43 ° C). TLXBSDZ :

[0104] P TLXBSDZ =0.5839MPa

[0105] Get the ideal locking compensation ΔP LXBS :

[0106] ΔP LXBS =P 20BSDZCS -P TLXBSDZ =0.5065-0.5839=-0.0774MPa

[0107] Then we get the compensation error ΔP WZBS :

[0108] ΔP WZBS =ΔP-ΔP LXBS =-0.0978-(-0.0774)=-0.0204MPa

[0109] Thus, the locking contact action value P of the contact at temperature T can be obtained. 20BSDZT :

[0110] P 20BSDZT =P 20BSDZCS -ΔP WZBS =0.5065MPa-(-0.0204)=0.5269MPa

[0111] Then the simulation verification of the locking contacts of the gas density relay is completed.

[0112] 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, the differences are 0.0017MPa and 0.0026MPa respectively, and both can be applied in engineering applications.

[0113] An embodiment of the present invention further provides a simulation verification device for a gas density relay, the device comprising:

[0114] The compensation calculation module is used to obtain 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;

[0115] The contact action pressure value calculation module is used to calculate the alarm contact action value P of the gas density relay at room temperature based on the compensation amount ΔP 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 PT BSDZ ;

[0116] The action value calculation module is used to calculate the action pressure value P of the alarm contact. TBJDZ And the locking contact action pressure value P TBSDZ , temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured to obtain the alarm action value P of the gas density relay at the temperature value T 20BJDZT and blocking action value P 20BSDZT ;

[0117] Verification module, used to verify the alarm action value P 20BJDZT and blocking action value P 20BSDZT Calibrate the gas density relay;

[0118] Among them, P 20DZCS and P 20FZCS The gas density relay is obtained in advance by the contact action value test and the simulation signal action value test of the gas density relay at room temperature before leaving the factory; the conversion according to the pressure-temperature characteristic relationship of the gas to be tested includes calculation through the Betty-Bridgeman equation. For the SF6 / N2 mixed gas, the SF6 / N2 mixed gas state equation can be calculated using Dalton's partial pressure law, the Betty-Bridgeman equation, and the ideal gas state equation.

[0119] The specific manner in which each module in the simulation verification device for a gas density relay in this embodiment of the present invention realizes its function is the same as the steps of the simulation verification method for a gas density relay involved in the above-mentioned embodiment, and its repeated description will be omitted here.

[0120] In summary, the embodiment of the present invention provides a simulation verification method and device for 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 the simulation detection signal value of the gas density relay at room temperature; obtaining an alarm contact action pressure value and a locking contact action pressure value of the gas density relay at temperature T according to the compensation amount and the alarm contact action value and the locking contact action value of the gas density relay at room temperature; converting the alarm contact action pressure value and the locking contact action pressure value, the temperature value T, and the pressure-temperature characteristic relationship of the gas to be measured to obtain the alarm action value and the locking action value of the gas density relay at temperature value T; and verifying the gas density relay according to the alarm action value and the locking action value. The technical solution of the embodiment of the present invention uses a simulation detection signal to realize the verification of the gas density relay, without disassembling the gas density relay, the detection process is safe and does not require manual intervention, and the obtained verification result has high accuracy.

[0121] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A simulation verification 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 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 Calibrate the gas density relay; Among them, 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. 20BSDZCS The gas density relay is obtained in advance through the locking contact action value test of the gas density relay at room temperature. 20FZCS The gas density relay is obtained in advance by the simulation signal action value test of the gas density relay at room temperature; 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 conversion of the gas to be measured include calculations 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, characterized in that The method further comprises: According to the alarm contact action value P of the gas density relay at normal 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 value 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 lock compensation error value 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 normal temperature 20BJDZCS And / or blocking contact action value P 20BSDZCS , and the alarm compensation error value ΔP WZBJ And / or lock compensation error value ΔP WZBS , get the alarm action value P2 of the gas density relay at temperature T 0B J DZT and / or blocking action value P 20BSDZT : P 20BJDZT =P 20BJDZCS -ΔP WZBJ P 20BSDZT =P 20BSDZCS -ΔP WZBS 。 10. A simulation verification device for a gas density relay, characterized in that: The device comprises: The compensation calculation module is used to obtain 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; The contact action pressure value calculation module is used to calculate the alarm contact action value P of the gas density relay at room temperature based on the compensation amount ΔP 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 ; The action value calculation module is 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 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 ; Used to determine the alarm action value P 20BJDZT and / or blocking action value P 20BSDZT Calibrate the gas density relay; Among them, 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. 20BSDZCS The gas density relay is obtained in advance through the locking contact action value test of the gas density relay at room temperature. 20FZCS The gas density relay is obtained in advance by the simulation signal action value test of the gas density relay at room temperature; 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 conversion of the gas to be measured include calculations through the Betty-Bridgeman equation.

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