Generator stator ground protection logic function off-line verification system and method

Abstract

The invention discloses a generator stator ground protection logic function off-line verification system and method, the off-line verification system is used for verifying injection type stator ground protection logic of a generator and a transformer to be protected, and the off-line verification system comprises a simulation device, a protection device and a signal device which are connected in sequence; equivalent parameters of the simulation device are consistent with characteristic parameters of a generator and a transformer to be protected; the signal device is used for sending a trigger signal to the protection device; the protection device is used for calculating an output compensation parameter by combining the trigger signal and the equivalent parameter after receiving the trigger signal; the compensation parameter is used for verifying the stator grounding protection logic function. A generator and a transformer to be protected are replaced by the simulation device, off-line verification of a generator stator grounding protection logic function can be realized, occupation of a unit maintenance key time window is avoided, and verification errors caused by fatigue of personnel can be prevented.

Description

Technical Field

[0001] The present invention relates to the field of relay protection, and in particular to an offline verification system and method for a generator stator grounding protection logic function. Background Art

[0002] The industry's injection-type generator 100% stator grounding protection logic function verification must be carried out online with real generators, transformers and other electrical primary equipment. It cannot be separated from the generators, transformers and other equipment for offline verification. In addition, during the verification process, it is necessary to inject voltage signals into the generator stator system, which will generate high voltage and affect the normal maintenance of the generator body. Therefore, this work can only be arranged in the early morning, which makes personnel tired and prone to errors, and occupies the key time window for unit maintenance, affecting the overall maintenance progress. Schematic diagram of the original injection-type generator 100% stator grounding protection logic function verification. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a system and method for offline verification of the logic function of the stator grounding protection of a generator.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing an offline verification system for the logic function of stator grounding protection of a generator, which is used to verify the logic function of the stator grounding protection of the generator and transformer to be protected, and the offline verification system comprises: a simulation device, a protection device and a signal device connected in sequence;

[0005] The simulation device is used to simulate the generator and transformer to be protected, and the equivalent parameters of the simulation device are consistent with the characteristic parameters of the generator and transformer to be protected;

[0006] The signal device is used to generate a trigger signal and send the trigger signal to the protection device; the trigger signal includes:

[0007] The protection device is used to calculate and output compensation parameters by combining the trigger signal and the equivalent parameters after receiving the trigger signal; the compensation parameters are used to verify the stator grounding protection logic function.

[0008] Preferably, in the generator stator grounding protection logic function offline verification system constructed by the present invention, the signal device is further used to: obtain the grounding resistance value of the generator stator grounding resistance, obtain discrete test data corresponding to the grounding resistance value, generate continuous test data according to the discrete test data, and send the continuous test data as the trigger signal to the protection device;

[0009] The simulation device includes a human-computer interaction port, and is also used to: obtain parameter setting information input from the outside through the human-computer interaction port, and set the equivalent parameters according to the parameter setting information; wherein the parameter setting information includes several specific parameter information and / or preset mode parameter information.

[0010] Preferably, in the generator stator ground protection logic function offline verification system constructed by the present invention, the discrete test data includes voltage signals, current signals and phase data points; the continuous test data includes continuous voltage waveform data and continuous current waveform data;

[0011] The generating of continuous test data according to the discrete test data includes: fitting the voltage signal, the current signal and the phase data points, and generating continuous voltage waveform data and continuous current waveform data by fitting.

[0012] Preferably, in the generator stator grounding protection logic function offline verification system constructed by the present invention, the offline verification system further comprises: a control device connecting the protection device and the signal device;

[0013] The control device is used to receive the compensation parameter output by the protection device, and is also used to receive the grounding resistance value obtained by the signal device.

[0014] Preferably, in the generator stator grounding protection logic function offline verification system constructed by the present invention, the control device is also used for:

[0015] The compensation parameter is compared with the grounding resistance value. If the compensation parameter is consistent with the grounding resistance value, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is normal.

[0016] Preferably, in the generator stator grounding protection logic function offline verification system constructed by the present invention, the control device is also used for:

[0017] The compensation parameter is compared with the grounding resistance value. If the difference between the compensation parameter and the grounding resistance value is greater than a preset error, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is abnormal.

[0018] Preferably, in the generator stator ground protection logic function offline verification system constructed by the present invention, the simulation device includes a first resistor, a second resistor and a first capacitive reactance connected in parallel with each other, and also includes a third resistor connected in series between the first resistor and the second resistor;

[0019] The first resistor is an equivalent parallel resistor of the grounding transformer circuit of the neutral point of the high-voltage transformer;

[0020] The second resistor is a stator single-phase grounding fault transition resistor of the generator to be protected;

[0021] The third resistor is the equivalent series resistance of the neutral point grounding transformer circuit of the generator to be protected;

[0022] The first capacitive reactance is the equivalent capacitive reactance of the stator winding of the generator to be protected to the ground.

[0023] Preferably, in the generator stator ground protection logic function offline verification system constructed by the present invention, the offline verification system further comprises a display device connected to the signal device;

[0024] The display device is used to collect and store the output voltage and the output current from the signal device, and is also used to display the output voltage and the output current in real time in the form of a graph.

[0025] The present invention also constructs an offline verification method for the logic function of the stator grounding protection of a generator, which is applied to the above-mentioned offline verification system for the logic function of the stator grounding protection of the generator. The offline verification method comprises the following steps:

[0026] S1, obtain trigger signal;

[0027] S2. Obtaining equivalent parameters consistent with characteristic parameters of the generator and transformer to be protected;

[0028] S3, calculating and obtaining compensation parameters according to the trigger signal and the equivalent parameters;

[0029] S4. Determine whether the stator grounding protection logic function is normal according to the compensation parameters.

[0030] Preferably, in the generator stator grounding protection logic function offline verification method constructed by the present invention, before step S4, the following steps are performed: obtaining the grounding resistance value of the generator stator grounding resistance;

[0031] Step S4 is specifically as follows:

[0032] Compare the compensation parameter with the grounding resistance value. If the compensation parameter is consistent with the grounding resistance value, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is normal. If the difference between the compensation parameter and the grounding resistance value is greater than a preset error, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is abnormal.

[0033] By implementing the present invention, the following beneficial effects are achieved:

[0034] The present invention discloses an offline verification system and method for the logic function of the stator grounding protection of a generator. The offline verification system is used to verify the stator grounding protection logic of the generator and transformer to be protected, and includes: a simulation device, a protection device and a signal device connected in sequence; the characteristic parameters of the simulation device are consistent with the characteristic parameters of the generator and transformer to be protected; the signal device is used to send a trigger signal to the protection device; the protection device is used to calculate and output compensation parameters in combination with the trigger signal and the equivalent parameters after receiving the trigger signal; the compensation parameters are used to verify the logic function of the stator grounding protection. By replacing the generator and transformer to be protected with a simulation device, the offline verification of the logic function of the stator grounding protection of the generator can be realized, avoiding occupying the key time window for unit maintenance, and preventing verification errors caused by personnel fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0036] Figure 1 4 is a first schematic diagram of an offline verification system for a generator stator grounding protection logic function in a first embodiment of the present invention;

[0037] Figure 2 2 is a second schematic diagram of the off-line verification system for the logic function of the stator grounding protection of the generator in the first embodiment of the present invention;

[0038] Figure 3 is a circuit diagram of a simulation device in a first embodiment of the present invention;

[0039] Figure 4 It is a flow chart of the offline verification method of the generator stator grounding protection logic function in the second embodiment of the present invention. DETAILED DESCRIPTION

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0041] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0042] The block diagrams shown in the accompanying drawings are only functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0043] See also Figure 1 to Figure 2 The first embodiment of the present invention discloses an offline verification system for the logic function of a generator stator grounding protection, which is used to verify the injection-type stator grounding protection logic of the generator and transformer to be protected. The offline verification system for the logic function of a generator stator grounding protection, which is used to verify the stator grounding protection logic function of the generator and transformer to be protected, comprises: a simulation device 1, a protection device 2 and a signal device 3 connected in sequence; the simulation device 1 is used to simulate the generator and transformer to be protected, and the equivalent parameters of the simulation device 1 are consistent with the characteristic parameters of the generator and transformer to be protected; the signal device 3 is used to generate a trigger signal and send the trigger signal to the protection device 2; the trigger signal comprises: the protection device 2 is used to calculate and output compensation parameters in combination with the trigger signal and the equivalent parameters after receiving the trigger signal; the compensation parameters are used to verify the logic function of the stator grounding protection.

[0044] The trigger signal sent by the signal device 3 is a current signal and a voltage signal. The compensation parameter is a resistance value. The protection device 2 is a stator grounding protection device for the generator and transformer to be protected. After receiving the trigger signal, the protection device 2 measures the output impedance angle through its internal calculation logic according to the current signal and the voltage signal therein, combined with the equivalent parameters in the simulation device 1. The resistance value of the impedance angle can be used to determine whether the alarm and tripping logic judgment function of the protection device 2 is operating normally.

[0045] The main electrical parameters of the generator and transformer are resistance, inductance and capacitance. These parameters can be obtained from the design manual or through actual measurement. For example, the resistance parameters and capacitance parameters of the real generator and transformer are measured using a test instrument to obtain the resistance and capacitance parameter values ​​of the generator and transformer. After obtaining these data, the resistance, inductance and capacitance components with corresponding parameters are selected to combine the circuit to form a simulation device 1, which can simulate the state of the generator and transformer in the circuit.

[0046] After obtaining the resistance, inductance and capacitance parameters of the generator and transformer, a model equivalent to the actual generator and transformer system on site can be built in the simulation device 1 by connecting and combining electronic components such as resistance, inductance and capacitance. Thus, the simulation device 1 can replace the actual generator and transformer to cooperate in the offline verification of the 100% stator grounding protection device of the injection generator.

[0047] In some embodiments of the present invention, the protection device 2 used is an injection generator 100% stator grounding protection device 2. The injection generator 100% stator grounding protection device connected to the simulation device 1 receives the waveform file from the low-frequency signal device 3, combines the equivalent parameters, calculates the amplitude and phase of the input low-frequency voltage signal and low-frequency current signal, and calculates the measured resistance value, which is the resistance value of the generator stator grounding.

[0048] Furthermore, in order to enable the offline verification system to autonomously process comprehensive data, in the generator stator grounding protection logic function offline verification system disclosed in this embodiment, the signal device 3 is further used to: obtain the grounding resistance value of the generator stator grounding resistance, obtain discrete test data corresponding to the grounding resistance value, generate continuous test data based on the discrete test data, and send the continuous test data as the trigger signal to the protection device 2; the simulation device 1 includes a human-computer interaction port, and the simulation device 1 is also used to: obtain parameter setting information input from the outside through the human-computer interaction port, and set the equivalent parameters according to the parameter setting information; wherein the parameter setting information includes several specific parameter information and / or preset mode parameter information.

[0049] Furthermore, in the offline verification system of the generator stator grounding protection logic function disclosed in this embodiment, the offline verification system also includes: a control device connecting the protection device 2 and the signal device 3; the control device is used to receive the compensation parameters output by the protection device 2, and is also used to receive the grounding resistance value obtained by the signal device 3.

[0050] Thus, the historical operation data of the generator and transformer to be protected can be directly input into the signal device 3, so that the discrete test data in the historical operation data can be directly processed by the signal device 3, which is more convenient and quick. And, further, the signal device 3 can send a waveform file to the protection device 2, and the waveform file contains a continuous voltage signal and a continuous current signal, and can be generated by the signal device 3 itself, specifically: the test data of different grounding resistances collected during the on-site online verification process are input into the low-frequency signal device 3. The signal device 3 fits the discrete voltage signal, current signal and corresponding phase data points in the test data to fit the continuous voltage signal and current signal waveforms. When the grounding resistance is different, the amplitude and phase of the voltage signal and the current signal are different. It is necessary to modulate and process the amplitude and phase of the test data points through the signal device 3 to generate waveform files corresponding to the voltage signal and current signal of different amplitudes and phases under different grounding resistance conditions.

[0051] Furthermore, in the generator stator grounding protection logic function offline verification system disclosed in this embodiment, the discrete test data includes voltage signals, current signals and phase data points; the continuous test data includes continuous voltage waveform data and continuous current waveform data; the generation of continuous test data based on the discrete test data includes: fitting the voltage signal, the current signal and the phase data points, and fitting to generate continuous voltage waveform data and continuous current waveform data.

[0052] Further, in the generator stator grounding protection logic function offline verification system disclosed in this embodiment, the signal device 3 is a low-frequency signal device, the voltage signal is a low-frequency voltage signal, the current signal is a low-frequency current signal, the voltage waveform is a low-frequency voltage waveform, and the current waveform is a low-frequency current waveform. The low-frequency voltage signal and low-frequency current signal required for verification are generated, modulated, and played by the low-frequency signal device to obtain a low-frequency voltage waveform and a low-frequency current waveform.

[0053] Furthermore, in the signal device 3, a low-frequency signal device is taken as an example. The low-frequency signal device can generate a continuous low-frequency signal waveform file by data fitting the voltage and current of each data point, and emit a low-frequency small signal of milliampere level and / or millivolt level through a power element. The low-frequency signal device can also modulate and edit the waveform of the low-frequency signal, including changing the duration and playback form of the low-frequency signal, and also including changing the amplitude and phase of the low-frequency signal.

[0054] Moreover, the amplitude and phase of the voltage signal and the current signal are different for different grounding resistances. After the signal device 3 modulates and processes the amplitude and phase of the test data points, and generates voltage signal waveform files and current signal waveform files of different amplitudes and phases under different grounding resistance conditions, an integrated waveform file for the resistance value states of multiple different grounding resistances can be formed. The integrated waveform file is sent to the protection device 2, and each situation of the generator and transformer to be protected connected to the grounding resistance of different resistance values ​​is checked one by one to ensure that the protection device 2 works normally within a certain range.

[0055] Furthermore, in the generator stator grounding protection logic function offline verification system disclosed in this embodiment, the control device is also used to: compare the compensation parameter with the grounding resistance value; if the compensation parameter is consistent with the grounding resistance value, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is normal.

[0056] Furthermore, in the generator stator grounding protection logic function offline verification system disclosed in this embodiment, the control device is also used to: compare the compensation parameter with the grounding resistance value; if the difference between the compensation parameter and the grounding resistance value is greater than a preset error, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is abnormal.

[0057] In some other embodiments, the offline verification system further includes: a control device connected to the protection device 2 and the signal device 3; the control device is used to receive the compensation parameter output by the protection device 2, and is also used to receive the resistance value of the grounding resistor obtained by the signal device 3, and compare the compensation parameter with the resistance value of the grounding resistor. If the compensation parameter is consistent with the resistance value of the grounding resistor, it is determined that the offline verification system has successfully completed the verification. By setting up a control device, the verification and judgment work after the output compensation parameter can be handed over to the system itself for processing, and the on-site staff can directly read the comparison result output by the control device, and the verification result can be known through the comparison result. Specifically, if the compensation parameter output by the protection device 2 is consistent with the resistance value of the corresponding grounding resistor obtained by the output device from the generator and transformer to be protected, it can be determined that the function of the protection device 2 is basically normal. Further, it can be allowed that there is an error within the range of ±10% between the above-mentioned compensation parameter and the corresponding resistance value of the grounding resistor, and the situation where the difference between the two is not large is regarded as qualified.

[0058] In order to further ensure the accuracy of the verification, after completing the model building of the simulation device 1, the consistency between the simulation device 1 and the actual generator and transformer system can be evaluated by measuring its output impedance, capacitive reactance parameters and other data. If the consistency between the simulation device 1 and the actual generator and transformer system is too low, it is necessary to check and optimize the settings of the simulation device 1.

[0059] In some other embodiments, the protection device 2 is a 100% stator grounding protection device for an injection-type generator, and the signal device 3 is a low-frequency signal device. The 100% stator grounding protection device for an injection-type generator receives a waveform file from the low-frequency signal device, and calculates the measured resistance value, i.e., the compensation parameter, by calculating the amplitude and phase of the input low-frequency voltage signal and low-frequency current signal. If the waveform file sent by the low-frequency signal device to the 100% stator grounding protection device for an injection-type generator contains multiple groups of low-frequency voltage signals and low-frequency current signals, corresponding calculations are performed based on these low-frequency voltage signals and low-frequency current signals.

[0060] If the injection type generator 100% stator grounding protection device works normally, the measured resistance value should be consistent with the resistance value of the generator stator grounding resistance, or at least the error range between the measured resistance value and the resistance value of the generator stator grounding resistance should be ±10%. The resistance value of the generator stator grounding resistance is obtained by collecting the generator and transformer to be protected by the low-frequency signal device, which can be collected on-site or by obtaining historical data. The low-frequency signal device makes a waveform file based on the low-frequency voltage signal and low-frequency current signal corresponding to the grounding resistance, and compares the grounding resistance value calculated by the injection type generator 100% stator grounding protection device 2 with the collected data of different grounding resistances, so as to check whether the protection device 2 measures the grounding resistance value accurately, and also check whether the alarm and tripping logic judgment functions of the protection device 2 are operating normally.

[0061] If the grounding resistance value calculated by the injection type generator 100% stator grounding protection device through the low-frequency voltage and current signals from the low-signal device is consistent with the test data actually collected on site, it proves that the calculation and logic judgment functions of the injection type generator 100% stator grounding protection device are normal. That is, the entire test process can complete the offline verification of the grounding resistance measurement function and protection action logic function of the injection type generator 100% stator grounding protection device.

[0062] Furthermore, in the generator stator grounding protection logic function offline verification system disclosed in this embodiment, the equivalent resistance parameters, equivalent inductance parameters and equivalent capacitance parameters of the simulation device 1 correspond to the resistance parameters, inductance parameters and capacitance parameters of the generator and transformer to be protected.

[0063] Furthermore, the simulation device 1 is provided with resistors, capacitors and other equipment, and through the combined connection of resistors and capacitors, it is possible to simulate the impedance, capacitance and other parameters of the real generator and transformer on site. Figure 3 In the offline verification system of the generator stator grounding protection logic function disclosed in this embodiment, the simulation device 1 includes a first resistor Rp, a second resistor Rf and a first capacitive reactance Xcg connected in parallel, and also includes a third resistor Rs connected in series between the first resistor Rp and the second resistor Rf; the first resistor Rp is the equivalent parallel resistor of the grounding transformer circuit of the neutral point of the high-voltage transformer; the second resistor Rf is the stator single-phase grounding fault transition resistor of the generator to be protected; the third resistor Rs is the equivalent series resistor of the neutral point grounding transformer circuit of the generator to be protected; the first capacitive reactance Xcg is the equivalent capacitive reactance of the stator winding of the generator to be protected to the ground. Through the simulation device 1, the verification process of the protection device 2 can be separated from the generator and carried out independently, thereby realizing the offline verification of the generator stator grounding protection logic function.

[0064] Furthermore, in the offline verification system of the generator stator grounding protection logic function disclosed in this embodiment, the offline verification system also includes a display device 4 connected to the signal device 3; the display device 4 is used to collect and store the output voltage and output current from the signal device 3, and is also used to display the output voltage and the output current in real time in the form of a graph. The display device 4 includes at least one display screen, and may also include a human-computer interaction module and a storage module to select the displayed data. When the display device 4 is connected to the low-frequency acquisition device, the low-frequency voltage signal and the low-frequency current signal emitted by the low-frequency signal device are collected, and the collected low-frequency voltage signal and the low-frequency current signal are converted into visual graphics, and these low-frequency voltage signals and low-frequency current signals are displayed in real time and stored and recorded through software. The display device 4 can display real-time data and historical data.

[0065] After the generator stator grounding protection logic function offline verification system is set up, the system operation process is: start the signal device 3, send voltage signals and current signals to the protection device 2, and the protection device 2 connected to the simulation device 1 performs logical operations according to the voltage signal, current signal and equivalent parameters to obtain compensation parameters. On-site personnel can measure the protection calculation compensation parameters required by the protection device 2 and judge whether the protection device 2 is working normally according to the compensation parameters.

[0066] See also Figure 4 The second embodiment of the present invention discloses an offline verification method for the logic function of the stator grounding protection of a generator, which is applied to the offline verification system for the logic function of the stator grounding protection of a generator. The offline verification method includes the following steps: S1, obtaining a trigger signal; S2, obtaining equivalent parameters consistent with the characteristic parameters of the generator and transformer to be protected; S3, calculating and obtaining compensation parameters according to the trigger signal and the equivalent parameters; S4, judging whether the logic function of the stator grounding protection is normal according to the compensation parameters. The trigger signal can be a waveform file containing a voltage signal and a current signal, and the compensation parameter is a measured resistance value.

[0067] Furthermore, in the offline verification method of the generator stator grounding protection logic function disclosed in this embodiment, before step S4, the following steps are performed: obtaining the grounding resistance value of the generator stator grounding resistance; step S4 is specifically: comparing the compensation parameter with the grounding resistance value, if the compensation parameter is consistent with the grounding resistance value, then it is determined that the stator grounding protection logic function of the generator and transformer to be protected is normal; if the difference between the compensation parameter and the grounding resistance value is greater than a preset error, then it is determined that the stator grounding protection logic function of the generator and transformer to be protected is abnormal.

[0068] By implementing the present invention, the following beneficial effects are achieved:

[0069] The present invention discloses an offline verification system and method for the logic function of the stator grounding protection of a generator. The offline verification system is used to verify the injection-type stator grounding protection logic of the generator and transformer to be protected, and includes: a simulation device, a protection device and a signal device connected in sequence; the equivalent parameters of the simulation device are consistent with the characteristic parameters of the generator and transformer to be protected; the signal device is used to send a trigger signal to the protection device; the protection device is used to calculate and output compensation parameters in combination with the trigger signal and the equivalent parameters after receiving the trigger signal; the compensation parameters are used to verify the logic function of the stator grounding protection. By replacing the generator and transformer to be protected with a simulation device, the offline verification of the logic function of the stator grounding protection of the generator can be realized, avoiding occupying the key time window for unit maintenance, and preventing verification errors caused by personnel fatigue.

[0070] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A generator stator grounding protection logic function offline verification system, used to verify the stator grounding protection logic function of the generator and transformer to be protected, characterized in that: The offline verification system comprises: a simulation device, a protection device and a signal device connected in sequence; The simulation device is used to simulate the generator and transformer to be protected, and the equivalent parameters of the simulation device are consistent with the characteristic parameters of the generator and transformer to be protected; The signal device is used to generate a trigger signal and send the trigger signal to the protection device; the trigger signal includes: The protection device is used to calculate and output compensation parameters by combining the trigger signal and the equivalent parameters after receiving the trigger signal; the compensation parameters are used to verify the stator grounding protection logic function.

2. The generator stator grounding protection logic function offline verification system according to claim 1 is characterized in that: The signal device is further used to: obtain the grounding resistance value of the generator stator grounding resistance, obtain discrete test data corresponding to the grounding resistance value, generate continuous test data according to the discrete test data, and send the continuous test data as the trigger signal to the protection device; The simulation device includes a human-computer interaction port, and is also used to: obtain parameter setting information input from the outside through the human-computer interaction port, and set the equivalent parameters according to the parameter setting information; wherein the parameter setting information includes several specific parameter information and / or preset mode parameter information.

3. The generator stator grounding protection logic function offline verification system according to claim 2 is characterized in that: The discrete test data includes voltage signals, current signals and phase data points; the continuous test data includes continuous voltage waveform data and continuous current waveform data; The generating of continuous test data according to the discrete test data includes: fitting the voltage signal, the current signal and the phase data points, and generating continuous voltage waveform data and continuous current waveform data by fitting.

4. The generator stator grounding protection logic function offline verification system according to claim 2 is characterized in that: The offline verification system further includes: a control device connected to the protection device and the signal device; The control device is used to receive the compensation parameter output by the protection device, and is also used to receive the grounding resistance value obtained by the signal device.

5. The generator stator grounding protection logic function offline verification system according to claim 4 is characterized in that: The control device is also used for: The compensation parameter is compared with the grounding resistance value. If the compensation parameter is consistent with the grounding resistance value, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is normal.

6. The generator stator grounding protection logic function offline verification system according to claim 4 is characterized in that: The control device is also used for: The compensation parameter is compared with the grounding resistance value. If the difference between the compensation parameter and the grounding resistance value is greater than a preset error, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is abnormal.

7. The generator stator grounding protection logic function offline verification system according to claim 1 is characterized in that: The simulation device includes a first resistor, a second resistor and a first capacitive reactance connected in parallel with each other, and also includes a third resistor connected in series between the first resistor and the second resistor; The first resistor is an equivalent parallel resistor of the grounding transformer circuit of the neutral point of the high-voltage transformer; The second resistor is a stator single-phase grounding fault transition resistor of the generator to be protected; The third resistor is the equivalent series resistance of the neutral point grounding transformer circuit of the generator to be protected; The first capacitive reactance is the equivalent capacitive reactance of the stator winding of the generator to be protected to the ground.

8. The generator stator grounding protection logic function offline verification system according to claim 1 is characterized in that: The offline verification system also includes a display device connected to the signal device; The display device is used to collect and store the output voltage and the output current from the signal device, and is also used to display the output voltage and the output current in real time in the form of a graph.

9. A method for offline verification of the logic function of a generator stator grounding protection, applied to the offline verification system for the logic function of a generator stator grounding protection according to claim 1, characterized in that: The offline verification method comprises the following steps: S1, obtain trigger signal; S2. Obtaining equivalent parameters consistent with characteristic parameters of the generator and transformer to be protected; S3, calculating and obtaining compensation parameters according to the trigger signal and the equivalent parameters; S4. Determine whether the stator grounding protection logic function is normal according to the compensation parameters.

10. The method for offline verification of the generator stator grounding protection logic function according to claim 9, characterized in that: Before step S4, the following steps are performed: obtaining a grounding resistance value of a stator grounding resistance of a generator; Step S4 is specifically as follows: Compare the compensation parameter with the grounding resistance value. If the compensation parameter is consistent with the grounding resistance value, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is normal. If the difference between the compensation parameter and the grounding resistance value is greater than a preset error, it is determined that the stator grounding protection logic function of the generator and transformer to be protected is abnormal.

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