GIS partial discharge online monitoring equipment alarm strategy validity test method and device

Abstract

The invention provides a GIS partial discharge online monitoring equipment alarm strategy validity detection method and device, and the method comprises the steps: obtaining a GIS ultrahigh frequency real partial discharge signal, eliminating an interference signal, and obtaining a real partial discharge signal after the interference signal is eliminated; reconstructing a real partial discharge signal after the interference signal is eliminated, and constructing an ultrahigh frequency simulation partial discharge signal; and carrying out alarm strategy validity detection on GIS partial discharge online monitoring equipment by using the ultrahigh frequency simulation partial discharge signal. Therefore, the method is high in field operability, simple and convenient to operate, accurate in judgment and easy to implement, and can be widely applied to warning strategy effectiveness detection.

Description

Technical Field

[0001] The invention relates to the technical field of electrical information measurement, and in particular to a method and a device for verifying the effectiveness of an alarm strategy of an online monitoring device for local discharge in a GIS. Background Art

[0002] Gas Insulated Switchgear (GIS) is a key equipment in the power system. As the scale of China's power grid increases, GIS insulation discharge failures occur frequently. In order to ensure the long-term stable operation of GIS and improve its reliability, ultra-high frequency (UHF) live detection methods are generally used to diagnose whether there is a partial discharge (PD) defect inside the GIS to avoid unexpected equipment failures.

[0003] At present, some manufacturers have produced GIS partial discharge online monitoring equipment (or GIS partial discharge online monitoring device). GIS partial discharge online monitoring equipment usually has the ability to warn of internal discharge in GIS, which is one of the important parameters of its performance indicators.

[0004] Therefore, it is of great significance to verify the alarm capability of GIS partial discharge online monitoring equipment, and it is urgent to provide a technical solution for verifying the effectiveness of the alarm strategy of GIS partial discharge online monitoring equipment. Summary of the invention

[0005] In view of this, the present invention provides a method for verifying the effectiveness of the alarm strategy of an online partial discharge monitoring device of a GIS, aiming to solve the problem in the prior art that there is a lack of a method for verifying the effectiveness of the alarm strategy of an online partial discharge monitoring device of a UHF frequency.

[0006] In a first aspect, the present invention provides a method for detecting the effectiveness of an alarm strategy of an online monitoring device for local discharge in a GIS, comprising:

[0007] Obtain the real partial discharge signal of the gas insulated switchgear GIS ultra-high frequency, eliminate its interference signal, and obtain the real partial discharge signal after eliminating the interference signal;

[0008] Reconstruct the real partial discharge signal after eliminating the interference signal and construct the UHF simulated partial discharge signal;

[0009] The ultra-high frequency simulated partial discharge signal is used to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring equipment.

[0010] Furthermore, the obtaining of the ultra-high frequency real partial discharge signal of the gas insulated switchgear GIS includes:

[0011] Collecting ultra-high frequency real partial discharge signals when the gas-insulated switchgear has multiple groups of different defect types at the GIS operation site, wherein the real partial discharge signals include multiple pulses;

[0012] Wherein, the gas insulated switchgear is arranged with a plurality of built-in ultra-high frequency sensors for detecting internal discharge signals of the GIS;

[0013] The gas insulated switchgear is also provided with at least one external space ultra-high frequency sensor for detecting discharge signals in the space outside the GIS;

[0014] The defect type includes any of the following: a tip defect, a suspension defect, an air gap defect, a particle defect, and a poor contact current type defect.

[0015] Furthermore, the reconstructing the real partial discharge signal after eliminating the interference signal to construct the ultra-high frequency simulated partial discharge signal includes:

[0016] Generate reference signals for arbitrary waveform generators;

[0017] Generate trigger signal for arbitrary waveform generator;

[0018] The reference signal is imported into an arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, and an industrial frequency phase controller is used to control the initial phase of the first pulse output by the arbitrary waveform generator to be consistent with the initial phase of the ultra-high frequency real partial discharge signal collected on-site, so that the arbitrary waveform generator outputs an ultra-high frequency simulated partial discharge signal having a PRPD spectrum characteristic similar to the ultra-high frequency real partial discharge signal collected on-site as a constructed ultra-high frequency simulated partial discharge signal.

[0019] Further, generating a reference signal for an arbitrary waveform generator includes:

[0020] Extract the initial phase of each pulse of the real UHF partial discharge signal after eliminating interference;

[0021] Arrange the UHF real partial discharge signals in order from small to large according to the initial phase of each pulse;

[0022] Extracting the UHF real PD signal with an initial phase of 0-359° in cycles, wherein at most one pulse of UHF PD signal is extracted in each cycle, and recording the sequence number of the cycle in which the UHF PD signal extracted in each cycle is located;

[0023] Extract the ultra-high frequency partial discharge pulse signal of each period, re-arrange the ultra-high frequency real partial discharge signal according to the sequence number of the period from small to large, and sort the ultra-high frequency real partial discharge signal in the same period from small to large according to the initial phase;

[0024] The pulses of the ultra-high frequency partial discharge signal are sorted according to the sequence number and the initial phase of the cycle to obtain the reference signal.

[0025] Further, generating a trigger signal for an arbitrary waveform generator includes:

[0026] The pulses of the ultra-high frequency partial discharge signal, which are sequenced according to the period number and the initial phase, are introduced into the arbitrary waveform generator;

[0027] According to the characteristic that each cycle time is 20 ms, the time interval between each two adjacent points of the arbitrary waveform generator is calculated, and the trigger signal for the arbitrary waveform generator is set according to the time interval.

[0028] Furthermore, before using the ultra-high frequency simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device, the method further includes:

[0029] An arbitrary waveform generator is used as a signal output source, the reference signal is imported into the arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, an industrial frequency phase controller is used to control the initial phase of the first pulse to be consistent with the initial phase of an ultra-high frequency real partial discharge signal collected on-site, and the PRPD spectrum of the ultra-high frequency simulated partial discharge signal output by the arbitrary waveform generator is determined to be consistent with the PRPD spectrum of the ultra-high frequency real partial discharge signal collected on-site.

[0030] Furthermore, the use of the UHF simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device includes:

[0031] Connect the coaxial cable of the detection channel of the GIS partial discharge online monitoring equipment to the output port of the arbitrary waveform generator, and connect the power frequency phase controller to the arbitrary waveform generator;

[0032] According to the alarm strategy of the GIS partial discharge online monitoring equipment for partial discharge events, the amplitude and intermittent frequency of the arbitrary waveform generator output signal are set;

[0033] The initial phase of the first pulse is controlled by a power frequency phase controller to be consistent with the initial phase of the UHF real partial discharge signal collected on site;

[0034] Obtain the partial discharge events monitored by the background program of the GIS partial discharge online monitoring device and / or the alarm information generated, and determine that the alarm strategy for the partial discharge events is effective; wherein, after the background program of the GIS partial discharge online monitoring device detects that the signal output duration meets the time limit set by the alarm strategy for generating a partial discharge event, it determines that a partial discharge event is monitored, and generates alarm information for display on the display interface.

[0035] In a second aspect, the present invention provides a device for detecting the effectiveness of an alarm strategy of an online monitoring device for local discharge in a GIS, comprising:

[0036] The real partial discharge signal acquisition and processing unit is used to acquire the real partial discharge signal of the gas insulated switchgear GIS ultra-high frequency, eliminate its interference signal, and obtain the real partial discharge signal after eliminating the interference signal;

[0037] A simulated partial discharge signal construction unit is used to reconstruct a real partial discharge signal after eliminating interference signals and to construct a UHF simulated partial discharge signal;

[0038] The effectiveness detection unit is used to use the ultra-high frequency simulated partial discharge signal to perform an effectiveness detection on the alarm strategy of the GIS partial discharge online monitoring equipment.

[0039] Furthermore, the obtaining of the ultra-high frequency real partial discharge signal of the gas insulated switchgear GIS includes:

[0040] Collecting ultra-high frequency real partial discharge signals when the gas-insulated switchgear has multiple groups of different defect types at the GIS operation site, wherein the real partial discharge signals include multiple pulses;

[0041] Wherein, the gas insulated switchgear is arranged with a plurality of built-in ultra-high frequency sensors for detecting internal discharge signals of the GIS;

[0042] The gas insulated switchgear is also provided with at least one external space ultra-high frequency sensor for detecting discharge signals in the space outside the GIS;

[0043] The defect type includes any of the following: a tip defect, a suspension defect, an air gap defect, a particle defect, and a poor contact current type defect.

[0044] Furthermore, the reconstructing the real partial discharge signal after eliminating the interference signal to construct the ultra-high frequency simulated partial discharge signal includes:

[0045] Generate reference signals for arbitrary waveform generators;

[0046] Generate trigger signal for arbitrary waveform generator;

[0047] The reference signal is imported into an arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, and an industrial frequency phase controller is used to control the initial phase of the first pulse output by the arbitrary waveform generator to be consistent with the initial phase of the ultra-high frequency real partial discharge signal collected on-site, so that the arbitrary waveform generator outputs an ultra-high frequency simulated partial discharge signal having a PRPD spectrum characteristic similar to the ultra-high frequency real partial discharge signal collected on-site as a constructed ultra-high frequency simulated partial discharge signal.

[0048] Further, generating a reference signal for an arbitrary waveform generator includes:

[0049] Extract the initial phase of each pulse of the real UHF partial discharge signal after eliminating interference;

[0050] Arrange the UHF real partial discharge signals in order from small to large according to the initial phase of each pulse;

[0051] Extracting the UHF real PD signal with an initial phase of 0-359° in cycles, wherein at most one pulse of UHF PD signal is extracted in each cycle, and recording the sequence number of the cycle in which the UHF PD signal extracted in each cycle is located;

[0052] Extract the ultra-high frequency partial discharge pulse signal of each period, re-arrange the ultra-high frequency real partial discharge signal according to the sequence number of the period from small to large, and sort the ultra-high frequency real partial discharge signal in the same period from small to large according to the initial phase;

[0053] The pulses of the ultra-high frequency partial discharge signal are sorted according to the sequence number and the initial phase of the cycle to obtain the reference signal.

[0054] Further, generating a trigger signal for an arbitrary waveform generator includes:

[0055] The pulses of the ultra-high frequency partial discharge signal, which are sequenced according to the period number and the initial phase, are introduced into the arbitrary waveform generator;

[0056] According to the characteristic that each cycle time is 20 ms, the time interval between each two adjacent points of the arbitrary waveform generator is calculated, and the trigger signal for the arbitrary waveform generator is set according to the time interval.

[0057] Furthermore, before the effectiveness detection unit uses the UHF simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device, it is also used to:

[0058] An arbitrary waveform generator is used as a signal output source, the reference signal is imported into the arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, an industrial frequency phase controller is used to control the initial phase of the first pulse to be consistent with the initial phase of an ultra-high frequency real partial discharge signal collected on-site, and the PRPD spectrum of the ultra-high frequency simulated partial discharge signal output by the arbitrary waveform generator is determined to be consistent with the PRPD spectrum of the ultra-high frequency real partial discharge signal collected on-site.

[0059] Furthermore, the use of the UHF simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device includes:

[0060] Connect the coaxial cable of the detection channel of the GIS partial discharge online monitoring equipment to the output port of the arbitrary waveform generator, and connect the power frequency phase controller to the arbitrary waveform generator;

[0061] According to the alarm strategy of the GIS partial discharge online monitoring equipment for partial discharge events, the amplitude and intermittent frequency of the arbitrary waveform generator output signal are set;

[0062] The initial phase of the first pulse is controlled by a power frequency phase controller to be consistent with the initial phase of the UHF real partial discharge signal collected on site;

[0063] Obtain the partial discharge events monitored by the background program of the GIS partial discharge online monitoring device and / or the alarm information generated, and determine that the alarm strategy for the partial discharge events is effective; wherein, after the background program of the GIS partial discharge online monitoring device detects that the signal output duration meets the time limit set by the alarm strategy for generating a partial discharge event, it determines that a partial discharge event is monitored, and generates alarm information for display on the display interface.

[0064] In a third aspect, the present invention provides a terminal, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect.

[0065] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the method described in the first aspect.

[0066] The effectiveness verification method of the alarm strategy of GIS partial discharge online monitoring equipment proposed in the present invention reconstructs the ultra-high frequency real partial discharge signal collected on-site into a simulated ultra-high frequency partial discharge signal, uses an arbitrary waveform generator to send different types of simulated partial discharge signals to each detection channel of the online monitoring equipment, and outputs partial discharge signals with different discharge amplitudes and output frequencies according to the alarm thresholds of monitoring equipment from different manufacturers, and records the alarm information generated by the background program of the online monitoring equipment (or displays it on the display interface of the online monitoring).

[0067] The effectiveness test method of the alarm strategy of the GIS partial discharge online monitoring equipment tests the alarm capability of the gas-insulated switchgear GIS partial discharge online monitoring equipment item by item. It has strong on-site operability, simple operation, accurate judgment, and easy implementation. It can be widely used in the effectiveness test of the alarm strategy of ultra-high frequency partial discharge online monitoring equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0069] Figure 1 A schematic diagram of a flow chart of a method for detecting the effectiveness of an alarm strategy for an online monitoring device for GIS local discharge according to an embodiment of the present invention;

[0070] Figure 2 It is a schematic diagram of a method for arranging on-site signals collected by ultra-high frequency sensors in a method for detecting the effectiveness of an alarm strategy for an online monitoring device for GIS partial discharge according to an embodiment of the present invention;

[0071] Figure 3A It is a PRPD spectrum of a real UHF partial discharge signal collected on-site in an embodiment of the present invention;

[0072] Figure 3B A PRPD spectrum of a UHF simulated partial discharge signal constructed in an embodiment of the present invention;

[0073] Figure 4 A connection diagram of a GIS ultra-high frequency partial discharge online monitoring system according to an embodiment of the present invention;

[0074] Figure 5 A schematic diagram of a partial discharge event alarm browser displayed on a display interface of a gas insulated switchgear GIS partial discharge online monitoring device in an embodiment of the present invention;

[0075] Figure 6 It is a schematic diagram of the composition of the GIS partial discharge online monitoring equipment alarm strategy effectiveness detection device according to an embodiment of the present invention;

[0076] Figure 7 A schematic diagram of the composition of a terminal to which the alarm strategy effectiveness detection method according to an embodiment of the present invention is applied;

[0077] Figure 8 It is a schematic diagram of a program product using the alarm strategy effectiveness detection method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0078] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0079] There are many kinds of signal sources, including sine wave signal sources, function generators, pulse generators, sweep generators, arbitrary waveform generators, synthetic signal sources, etc. Among them, the arbitrary waveform generator is a special signal source that has the waveform generation capability of other signal sources, so it is suitable for the needs of various simulation experiments.

[0080] The Phase Resolved Partial Discharge (PRPD) spectrum describes the amplitude (Y-axis) and phase angle (X-axis) of each discharge event, and can intuitively illustrate the partial discharge activity for 360 degrees of an AC cycle.

[0081] In view of the fact that the current GIS partial discharge online monitoring equipment lacks effective warning capabilities or alarm strategy effectiveness detection methods, the present invention proposes a technical solution for verifying the effectiveness of the alarm strategy of GIS partial discharge online monitoring equipment based on reconstruction of real partial discharge signals, so as to verify whether the warning function of the partial discharge online monitoring equipment is operating normally and the effectiveness of the alarm strategy.

[0082] like Figure 1 As shown, the method for detecting the effectiveness of the alarm strategy of GIS partial discharge online monitoring equipment based on reconstruction of real partial discharge signals according to an embodiment of the present invention includes the following steps S100 to S300.

[0083] S100: Acquire a gas insulated switchgear GIS ultra-high frequency real partial discharge signal, eliminate its interference signal, and obtain a real partial discharge signal after eliminating the interference signal, wherein the real partial discharge signal includes multiple pulses.

[0084] In some embodiments, multiple groups of GIS UHF real partial discharge signals of different defect types are collected at the GIS operation site. When collecting GIS UHF real partial discharge signals, the sensor is arranged in the gas insulated switchgear as shown in the following figure: Figure 2 As shown, sensors 1, 2, and 3 are built-in UHF sensors used to detect partial discharge signals inside the GIS, and sensor 4 is an external space UHF sensor used to detect partial discharge signals outside the GIS. Figure 2 It is shown that the external UHF sensor is usually installed at the edge of the pot insulator; if the pot insulator has a metal shield, it is installed at the pouring mouth.

[0085] Specifically, the built-in UHF sensor or the external space UHF sensor is a broadband UHF sensor of 30MHz-150MHz.

[0086] It should be understood that the built-in sensor channel includes a built-in ultra-high frequency sensor, a signal conditioning circuit and an analog-to-digital conversion circuit, which will not be repeated; the external space sensor channel includes an external space ultra-high frequency sensor, a signal conditioning circuit and an analog-to-digital conversion circuit, which will not be repeated.

[0087] In some embodiments, by comparing the output signals of the built-in sensor channel and the external sensor channel, the interference signal in the GIS ultra-high frequency real partial discharge signal collected on-site can be eliminated, and the real partial discharge signal after eliminating the interference signal, or the ultra-high frequency real partial discharge signal, or the ultra-high frequency real partial discharge signal collected on-site as described later can be obtained.

[0088] In some embodiments, the real partial discharge signal obtained after eliminating the interference signal is processed to generate a PRPD spectrum of the ultra-high frequency real partial discharge signal.

[0089] Specifically, when collecting the ultra-high frequency real partial discharge signal of GIS, the ultra-high frequency real partial discharge signal is collected respectively for GIS containing different defects; among which, the defect types of GIS include any of the following: voltage defects such as tip defects, suspension defects, air gap defects, particle defects and current type defects such as poor contact.

[0090] In some embodiments, a GIS ultra-high frequency real partial discharge signal with 2000 pulses is collected on site.

[0091] S200: Reconstruct the real partial discharge signal after eliminating the interference signal, and construct the ultra-high frequency simulated partial discharge signal.

[0092] In some embodiments, the reconstructing the real partial discharge signal after eliminating the interference signal to construct the ultra-high frequency simulated partial discharge signal includes:

[0093] Generate reference signals for arbitrary waveform generators;

[0094] Generate trigger signal for arbitrary waveform generator;

[0095] The reference signal is imported into an arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, and an industrial frequency phase controller is used to control the initial phase of the first pulse to be consistent with the initial phase of an ultra-high frequency real partial discharge signal collected on site, so that the arbitrary waveform generator outputs an ultra-high frequency simulated partial discharge signal having a PRPD spectrum characteristic similar to the ultra-high frequency real partial discharge signal collected on site.

[0096] Specifically, generating a reference signal for an arbitrary waveform generator includes:

[0097] Extract the initial phase of each pulse of the real UHF partial discharge signal after eliminating interference;

[0098] Arrange the UHF real partial discharge signals in order from small to large according to the initial phase of each pulse;

[0099] Extracting the UHF real PD signal with an initial phase of 0-359° in cycles, wherein at most one pulse of UHF PD signal is extracted in each cycle, and recording the sequence number of the cycle in which the UHF PD signal extracted in each cycle is located;

[0100] Extract the ultra-high frequency partial discharge pulse signal of each period, re-arrange the ultra-high frequency real partial discharge signal according to the sequence number of the period from small to large, and sort the ultra-high frequency real partial discharge signal in the same period from small to large according to the initial phase;

[0101] The pulses of the ultra-high frequency partial discharge signal are sorted according to the sequence number and the initial phase of the cycle to obtain the reference signal for subsequent introduction into the arbitrary waveform generator.

[0102] Specifically, generating a trigger signal for an arbitrary waveform generator includes:

[0103] The pulses of the ultra-high frequency partial discharge signal, which are sequenced according to the period number and the initial phase, are introduced into the arbitrary waveform generator;

[0104] According to the characteristic that each cycle time is 20 ms, the time interval between each two adjacent points of the arbitrary waveform generator is calculated, and the trigger signal for the arbitrary waveform generator is set according to the time interval.

[0105] Specifically, the arbitrary waveform generator is a PicoScope digital oscilloscope, and the ETS mode described later is used to set a trigger signal for the PicoScope digital oscilloscope.

[0106] Generally, there are three sampling modes for PicoScope 2200 series digital oscilloscopes: Block mode, Streaming mode and ETS (Equivalent Time Sampling) mode. The sampling frequency in Block mode is very high (<μs); the digital oscilloscope will first store the collected data in its own memory, and then transmit it to the computer in the form of data blocks (Block). This method can quickly capture the changes in the output signal. However, due to the limited memory capacity of the digital oscilloscope, long-term data acquisition is not possible; the sampling frequency in Streaming mode is relatively low, and the instrument will store the collected data directly in the computer memory. The length of the recorded data is determined by the computer memory capacity, and there is no delay, which is suitable for long-term sampling with low sampling frequency requirements. The ETS mode is suitable for long-term acquisition of periodic signals. After several cycles of acquisition, the instrument will synthesize the obtained repetitive signals so that its equivalent sampling frequency is higher than the sampling frequency of a single cycle.

[0107] When online monitoring of UHF real partial discharge signals is performed, the above three sampling modes can be used in combination to broaden the scope of use of the online monitoring system. For example, the Block mode is used to measure the transient response of the system, the Streaming mode is used to measure the steady-state response of the system, and the ETS mode can be used for trigger setting.

[0108] In the above, the UHF real partial discharge signal is reconstructed so that the arbitrary waveform generator responds to the reference signal and outputs a UHF simulated partial discharge signal having a PRPD spectrum characteristic similar to that of the UHF real partial discharge signal collected on site.

[0109] In some embodiments, a simulated partial discharge signal is constructed by outputting an arbitrary waveform generator, a PicoScope provides a trigger signal for the arbitrary waveform generator, an industrial frequency phase controller controls the initial phase of the output signal, and an online monitoring device receives the simulated partial discharge signal emitted by the arbitrary waveform generator.

[0110] In some embodiments, real signal data collected on-site are sorted according to phase characteristics, and pulse signals with the same phase are placed in different periods, and re-sorted according to the period in which the signal is located and the initial phase of the signal. The re-sorted signals are imported into an arbitrary waveform generator, and a trigger sequence is set according to the time difference of each adjacent pulse signal. The signals are imported into PicoScope as a trigger source for the arbitrary waveform generator, and the first group of signals emitted are made to have the same phase as the group of signals emitted on-site through an industrial frequency phase controller, thereby emitting a simulated partial discharge signal having a PRPD spectrum characteristic similar to that of the real signal collected on-site.

[0111] In some embodiments, before using the UHF simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring equipment, it also includes: determining that the PRPD spectrum of the UHF real partial discharge signal collected on-site is consistent with the PRPD spectrum of the constructed UHF simulated partial discharge signal.

[0112] Specifically, an arbitrary waveform generator is used as the signal output source, and the constructed ultra-high frequency simulated partial discharge signal is imported into the arbitrary waveform generator, and the arbitrary waveform generator, namely Picoscope, is triggered to output, that is, output to the trigger port of the arbitrary waveform generator, and the initial phase of the first pulse is controlled by the power frequency phase controller to be consistent with the initial phase of the ultra-high frequency real partial discharge signal collected on site. The output signal is measured by an oscilloscope, the output signal is exported, and the PRPD spectrum of the constructed ultra-high frequency simulated partial discharge signal is generated.

[0113] The PRPD spectrum of the UHF real partial discharge signal collected on-site is compared with the PRPD spectrum of the constructed UHF simulated partial discharge signal, and it is confirmed that the PRPD spectrum of the constructed UHF simulated partial discharge signal has the same amplitude and phase characteristics as the PRPD spectrum of the UHF real partial discharge signal collected on-site.

[0114] Figure 3A and 3B The PRPD spectrum of a typical insulation-type UHF real PD signal and the PRPD spectrum of a constructed UHF simulated PD signal are shown respectively. It can be seen that the two have roughly the same amplitude and phase characteristics.

[0115] S300: Using the ultra-high frequency simulated partial discharge signal, the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device is tested.

[0116] In some embodiments, a GIS ultra-high frequency partial discharge online monitoring system is constructed to use the ultra-high frequency simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring equipment.

[0117] Specifically, the connection diagram of the GIS UHF partial discharge online monitoring system is as follows: Figure 4 As shown. Connect the coaxial cable of the detection channel of the online monitoring device 40 to the output port of the arbitrary waveform generator 20, and connect the power frequency phase controller 10 to the arbitrary waveform generator 20. Use the arbitrary waveform generator as the signal output source to output the constructed pulse-form ultra-high frequency simulated partial discharge signal; use the power frequency phase controller 10 to control the initial phase of the first pulse to be consistent with the initial phase of the ultra-high frequency real partial discharge signal collected on site, so as to further use the background program of the online monitoring device 40 to generate a partial discharge event displayed on the display interface or generate an alarm information.

[0118] It should be understood that by using simulated partial discharge signals containing different defects to test the effectiveness of the alarm strategy of each detection channel of the UHF partial discharge online monitoring equipment in turn, it is possible to more comprehensively test and inspect the warning capability, pulse recognition rate and equipment performance of the UHF partial discharge online monitoring equipment.

[0119] Part of the display interface of an online monitoring device Figure 5 As shown in FIG. 1 , the details of the partial discharge event recorded by the floating electrode discharge defect of phase B are displayed, such as the discharge amplitude or discharge frequency is lower than the set alarm threshold.

[0120] In some embodiments, according to the alarm strategy of the gas insulated switchgear GIS partial discharge online monitoring device for partial discharge events, the arbitrary waveform generator output signal is set, such as setting the parameters such as the amplitude and intermittent frequency of the arbitrary waveform generator 20 output signal;

[0121] When the background program detects that the output signal meets the alarm strategy for generating a partial discharge event, an alarm alarm message is generated. For example, when the background program detects that the signal output duration meets the time limit set by the alarm strategy for generating a partial discharge event, an alarm alarm message is generated and displayed, and the detected background event information is recorded in the background; for example, the signal output duration is not less than the set time limit of the alarm strategy for generating a partial discharge event, or the discharge amplitude or discharge frequency is lower or higher than the preset alarm threshold.

[0122] It should be understood that the online monitoring device may have different alarm strategies for different types of partial discharge events. Therefore, for different types of ultra-high frequency partial discharges, the above steps S100, S200 and S300 are repeated, and the constructed ultra-high frequency simulated partial discharge signals are used to respectively detect the alarm capabilities of the partial discharge online monitoring device for different types of ultra-high frequency partial discharge simulation signals.

[0123] In summary, the method for verifying the effectiveness of the alarm strategy of the gas-insulated switchgear GIS partial discharge online monitoring equipment proposed in the present invention verifies the alarm capability of the gas-insulated switchgear GIS partial discharge online monitoring equipment item by item, has strong on-site operability, simple operation, accurate judgment, and easy implementation, and can be widely used in the effectiveness detection of the alarm strategy of ultra-high frequency partial discharge online monitoring equipment.

[0124] Best Mode

[0125] Test the alarm strategy of GIS partial discharge online monitoring equipment. The diagnostic interface is as follows: Figure 5 As shown. The alarm frequency threshold of a manufacturer's GIS partial discharge online monitoring equipment is set to 24 / 24 hours. The signal output frequency of an arbitrary waveform is set, and a UHF suspended partial discharge signal is output every five minutes. The alarm capability test result is that the online monitoring equipment did not generate an alarm message. The reason for the failure to alarm is that the discharge time is too short and the energy is too low. The background program diagnosed it as a low-energy discharge, so no discharge event occurred. The test plan was adjusted to extend the time of each discharge by continuously sending out 30 UHF partial discharge signals in a short period of time, and output a partial discharge signal every five minutes. When the partial discharge signal is sent three times in a cycle, the GIS partial discharge online monitoring equipment generates a partial discharge alarm message.

[0126] In summary, the effectiveness verification method of the alarm strategy of GIS partial discharge online monitoring equipment proposed in the present invention reconstructs the ultra-high frequency real partial discharge signal collected on-site into a simulated ultra-high frequency partial discharge signal, uses an arbitrary waveform generator to send different types of simulated partial discharge signals to the detection channel of the online monitoring equipment, and outputs partial discharge signals with different discharge amplitudes and output frequencies according to the alarm thresholds of monitoring equipment from different manufacturers, and records the alarm information generated by the background program of the online monitoring equipment and displays it on the display interface of the online monitoring.

[0127] like Figure 6 As shown, the GIS partial discharge online monitoring equipment alarm strategy effectiveness detection device 60 of the embodiment of the present invention includes:

[0128] The real partial discharge signal acquisition and processing unit 61 is used to acquire the ultra-high frequency real partial discharge signal of the gas insulated switchgear GIS, eliminate its interference signal, and obtain the real partial discharge signal after eliminating the interference signal;

[0129] The simulated partial discharge signal construction unit 62 is used to reconstruct the real partial discharge signal after eliminating the interference signal and construct the ultra-high frequency simulated partial discharge signal;

[0130] The validity detection unit 63 is used to construct a UHF simulated partial discharge signal and use the UHF simulated partial discharge signal to perform an alarm strategy validity detection on the GIS partial discharge online monitoring device.

[0131] Furthermore, the obtaining of the ultra-high frequency real partial discharge signal of the gas insulated switchgear GIS includes:

[0132] Collecting ultra-high frequency real partial discharge signals when the gas-insulated switchgear has multiple groups of different defect types at the GIS operation site, wherein the real partial discharge signals include multiple pulses;

[0133] Wherein, the gas insulated switchgear is arranged with a plurality of built-in ultra-high frequency sensors for detecting internal discharge signals of the GIS;

[0134] The gas insulated switchgear is also provided with at least one external space ultra-high frequency sensor for detecting discharge signals in the space outside the GIS;

[0135] The defect type includes any of the following: a tip defect, a suspension defect, an air gap defect, a particle defect, and a poor contact current type defect.

[0136] Furthermore, the reconstructing the real partial discharge signal after eliminating the interference signal to construct the ultra-high frequency simulated partial discharge signal includes:

[0137] Generate reference signals for arbitrary waveform generators;

[0138] Generate trigger signal for arbitrary waveform generator;

[0139] The reference signal is imported into an arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, and an industrial frequency phase controller is used to control the initial phase of the first pulse output by the arbitrary waveform generator to be consistent with the initial phase of the ultra-high frequency real partial discharge signal collected on-site, so that the arbitrary waveform generator outputs an ultra-high frequency simulated partial discharge signal having a PRPD spectrum characteristic similar to the ultra-high frequency real partial discharge signal collected on-site as a constructed ultra-high frequency simulated partial discharge signal.

[0140] Further, generating a reference signal for an arbitrary waveform generator includes:

[0141] Extract the initial phase of each pulse of the real UHF partial discharge signal after eliminating interference;

[0142] Arrange the UHF real partial discharge signals in order from small to large according to the initial phase of each pulse;

[0143] Extracting the UHF real PD signal with an initial phase of 0-359° in cycles, wherein at most one pulse of UHF PD signal is extracted in each cycle, and recording the sequence number of the cycle in which the UHF PD signal extracted in each cycle is located;

[0144] Extract the ultra-high frequency partial discharge pulse signal of each period, re-arrange the ultra-high frequency real partial discharge signal according to the sequence number of the period from small to large, and sort the ultra-high frequency real partial discharge signal in the same period from small to large according to the initial phase;

[0145] The pulses of the ultra-high frequency partial discharge signal are sorted according to the sequence number and the initial phase of the cycle to obtain the reference signal.

[0146] Further, generating a trigger signal for an arbitrary waveform generator includes:

[0147] The pulses of the ultra-high frequency partial discharge signal, which are sequenced according to the period number and the initial phase, are introduced into the arbitrary waveform generator;

[0148] According to the characteristic that each cycle time is 20 ms, the time interval between each two adjacent points of the arbitrary waveform generator is calculated, and the trigger signal for the arbitrary waveform generator is set according to the time interval.

[0149] Furthermore, before the effectiveness detection unit uses the UHF simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device, it is also used to:

[0150] An arbitrary waveform generator is used as a signal output source, the reference signal is imported into the arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, an industrial frequency phase controller is used to control the initial phase of the first pulse to be consistent with the initial phase of an ultra-high frequency real partial discharge signal collected on-site, and the PRPD spectrum of the ultra-high frequency simulated partial discharge signal output by the arbitrary waveform generator is determined to be consistent with the PRPD spectrum of the ultra-high frequency real partial discharge signal collected on-site.

[0151] Furthermore, the use of the UHF simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device includes:

[0152] Connect the coaxial cable of the detection channel of the GIS partial discharge online monitoring equipment to the output port of the arbitrary waveform generator, and connect the power frequency phase controller to the arbitrary waveform generator;

[0153] According to the alarm strategy of the GIS partial discharge online monitoring equipment for partial discharge events, the amplitude and intermittent frequency of the arbitrary waveform generator output signal are set;

[0154] The initial phase of the first pulse is controlled by a power frequency phase controller to be consistent with the initial phase of the UHF real partial discharge signal collected on site;

[0155] Obtain the partial discharge events monitored by the background program of the GIS partial discharge online monitoring device and / or the alarm information generated, and determine that the alarm strategy for the partial discharge events is effective; wherein, after the background program of the GIS partial discharge online monitoring device detects that the signal output duration meets the time limit set by the alarm strategy for generating a partial discharge event, it determines that a partial discharge event is monitored, and generates alarm information for display on the display interface.

[0156] The embodiment of the present invention also provides a terminal to execute the above-mentioned GIS partial discharge online monitoring equipment alarm strategy effectiveness detection method. Figure 7 As shown, the terminal 8 includes: a processor 800, a memory 801, a bus 802 and a communication interface 803, wherein the processor 800, the communication interface 803 and the memory 801 are connected via the bus 802; the memory 801 stores a computer program that can be run on the processor 800, and the processor 800 executes the method provided by any embodiment of the present invention when running the computer program.

[0157] The memory 801 may include a high-speed random access memory (RAM), and may also include a non-volatile memory (Non-volatile Memory), such as at least one disk storage. The communication connection between the device network element and at least one other network element is realized through at least one communication interface 803 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0158] The bus 802 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 801 is used to store programs, and the processor 800 executes the programs after receiving execution instructions. The method disclosed in any implementation of the embodiment of the present invention may be applied to the processor 800, or implemented by the processor 800.

[0159] The processor 800 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the method can be completed by the hardware integrated logic circuit in the processor 800 or the instruction in the form of software. The processor 800 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present invention may be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in a decoding processor. The software module may be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 801, and the processor 800 reads the information in the memory 801 and completes the steps of the method in combination with its hardware.

[0160] The terminal provided in the embodiment of the present invention and the detection method provided in the aforementioned implementation manner are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented therein.

[0161] like Figure 8As shown, an embodiment of the present invention also provides a computer-readable storage medium corresponding to the method for detecting the effectiveness of the alarm strategy of the GIS local discharge online monitoring equipment provided in the aforementioned embodiment. The computer-readable storage medium is a CD on which a computer program (i.e., program product 900) is stored. When the computer program is run by the processor, it will execute the method provided in any of the aforementioned embodiments.

[0162] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0163] The computer-readable storage medium provided by the embodiment of the present invention is based on the same inventive concept as the method of the embodiment of the present invention, and has the same beneficial effects as the method adopted, run or implemented by the application program stored therein.

[0164] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these adjustments and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.

Claims

1. A method for detecting the effectiveness of the alarm strategy of GIS partial discharge online monitoring equipment, characterized in that: include: Obtain the real partial discharge signal of the gas insulated switchgear GIS ultra-high frequency, eliminate its interference signal, and obtain the real partial discharge signal after eliminating the interference signal; Reconstruct the real partial discharge signal after eliminating the interference signal and construct the UHF simulated partial discharge signal; The ultra-high frequency simulated partial discharge signal is used to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring equipment.

2. The GIS partial discharge online monitoring equipment alarm strategy effectiveness detection method according to claim 1 is characterized in that: The method of obtaining the real partial discharge signal of the gas insulated switchgear GIS ultra-high frequency comprises: Collecting ultra-high frequency real partial discharge signals when the gas-insulated switchgear has multiple groups of different defect types at the GIS operation site, wherein the real partial discharge signals include multiple pulses; Wherein, the gas insulated switchgear is arranged with a plurality of built-in ultra-high frequency sensors for detecting internal discharge signals of the GIS; The gas insulated switchgear is also provided with at least one external space ultra-high frequency sensor for detecting discharge signals in the space outside the GIS; The defect type includes any of the following: a tip defect, a suspension defect, an air gap defect, a particle defect, and a poor contact current type defect.

3. The GIS partial discharge online monitoring equipment alarm strategy effectiveness detection method according to claim 1 is characterized in that: The reconstructing of the real partial discharge signal after eliminating the interference signal to construct the ultra-high frequency simulated partial discharge signal includes: Generate reference signals for arbitrary waveform generators; Generate trigger signal for arbitrary waveform generator; The reference signal is imported into an arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, and an industrial frequency phase controller is used to control the initial phase of the first pulse output by the arbitrary waveform generator to be consistent with the initial phase of the ultra-high frequency real partial discharge signal collected on-site, so that the arbitrary waveform generator outputs an ultra-high frequency simulated partial discharge signal having a PRPD spectrum characteristic similar to the ultra-high frequency real partial discharge signal collected on-site as a constructed ultra-high frequency simulated partial discharge signal.

4. The GIS partial discharge online monitoring equipment alarm strategy effectiveness detection method according to claim 3 is characterized in that: The generating a reference signal for the arbitrary waveform generator comprises: Extract the initial phase of each pulse of the real UHF partial discharge signal after eliminating interference; Arrange the UHF real partial discharge signals in order from small to large according to the initial phase of each pulse; Extracting the UHF real PD signal with an initial phase of 0-359° in cycles, wherein at most one pulse of UHF PD signal is extracted in each cycle, and recording the sequence number of the cycle in which the UHF PD signal extracted in each cycle is located; Extract the ultra-high frequency partial discharge pulse signal of each period, re-arrange the ultra-high frequency real partial discharge signal according to the period number from small to large, and sort the ultra-high frequency real partial discharge signal in the same period according to the initial phase from small to large; The pulses of the ultra-high frequency partial discharge signal are sorted according to the sequence number and the initial phase of the cycle to obtain the reference signal.

5. The GIS partial discharge online monitoring equipment alarm strategy effectiveness detection method according to claim 4 is characterized in that: The generating of a trigger signal for an arbitrary waveform generator comprises: The pulses of the ultra-high frequency partial discharge signal, which are sequenced according to the period number and the initial phase, are introduced into the arbitrary waveform generator; According to the characteristic that each cycle time is 20 ms, the time interval between each two adjacent points of the arbitrary waveform generator is calculated, and the trigger signal for the arbitrary waveform generator is set according to the time interval.

6. The GIS partial discharge online monitoring equipment alarm strategy effectiveness detection method according to claim 5 is characterized in that: Before using the UHF simulated partial discharge signal to detect the effectiveness of the alarm strategy for the GIS partial discharge online monitoring device, it is also determined that the on-site collection includes: An arbitrary waveform generator is used as a signal output source, the reference signal is imported into the arbitrary waveform generator, the trigger signal is imported into the arbitrary waveform generator, an industrial frequency phase controller is used to control the initial phase of the first pulse to be consistent with the initial phase of an ultra-high frequency real partial discharge signal collected on-site, and the PRPD spectrum of the ultra-high frequency simulated partial discharge signal output by the arbitrary waveform generator is determined to be consistent with the PRPD spectrum of the ultra-high frequency real partial discharge signal collected on-site.

7. The GIS partial discharge online monitoring equipment alarm strategy effectiveness detection method according to claim 6 is characterized in that: The method of using the ultra-high frequency simulated partial discharge signal to detect the effectiveness of the alarm strategy of the GIS partial discharge online monitoring device includes: Connect the coaxial cable of the detection channel of the GIS partial discharge online monitoring equipment to the output port of the arbitrary waveform generator, and connect the power frequency phase controller to the arbitrary waveform generator; According to the alarm strategy of the GIS partial discharge online monitoring equipment for partial discharge events, the amplitude and intermittent frequency of the arbitrary waveform generator output signal are set; The constructed power frequency phase controller controls the initial phase of the first pulse to be consistent with the initial phase of the UHF real partial discharge signal collected on site; Obtain the partial discharge events monitored by the background program of the GIS partial discharge online monitoring device and / or the alarm information generated, and determine that the alarm strategy for the partial discharge events is effective; wherein, after the background program of the GIS partial discharge online monitoring device detects that the signal output duration meets the time limit set by the alarm strategy for generating a partial discharge event, it determines that a partial discharge event is monitored, and generates alarm information for display on the display interface.

8. A device for detecting the effectiveness of the alarm strategy of GIS partial discharge online monitoring equipment, characterized in that: include: The real partial discharge signal acquisition and processing unit is used to acquire the real partial discharge signal of the gas insulated switchgear GIS ultra-high frequency, eliminate its interference signal, and obtain the real partial discharge signal after eliminating the interference signal; A simulated partial discharge signal construction unit is used to reconstruct a real partial discharge signal after eliminating interference signals and to construct a UHF simulated partial discharge signal; The effectiveness detection unit is used to use the ultra-high frequency simulated partial discharge signal to perform an effectiveness detection on the alarm strategy of the GIS partial discharge online monitoring equipment.

9. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the method according to any one of claims 1 to 7.

10. A terminal, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method according to any one of claims 1 to 7.

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