CN103091609B - A kind of GIS local discharge on-line monitoring device performance detecting system and method thereof - Google Patents

Abstract

The invention relates to a performance detection system of a GIS partial discharge on-line monitoring device. Through its partial discharge measuring device and the GIS partial discharge on-line monitoring device connected to the GIS pipeline and installed outside or inside the GIS, the two are compared to detect The performance of the GIS partial discharge on-line monitoring device. The GIS pipeline of the GIS partial discharge on-line monitoring device performance testing system can test different on-line monitoring devices, and the independent structure of the pipeline can be easily disassembled to simulate various insulation defects. At the same time, the invention also discloses a method for checking the online monitoring device by using the performance testing system.

Description

A GIS partial discharge on-line monitoring device performance detection system and its method

technical field

The present application relates to the field of high-voltage power transmission, in particular to a performance detection system of a GIS partial discharge on-line monitoring device, and a method for checking the on-line monitoring device by using the system.

Background technique

SF ₆ Gas Insulated Substation (GIS) is a new type of electrical device that appeared in the 1970s. It combines circuit breakers, disconnectors, fast earthing switches, voltage transformers, current Electrical components such as pipes and/or cable terminals are enclosed and combined in a grounded metal casing, with SF ₆ gas as the insulating medium, and epoxy basin insulators are used as support insulation for the power transmission bus in the GIS, thus replacing the bare metal in the previous substation. The method of connecting various electrical equipment with wires and using air as insulation acts as a switch station. GIS has the advantages of small space, small footprint, no influence from the external environment, safe and reliable operation, etc. It has been widely used in high-voltage power transmission and transformation such as urban power supply, power plants, large industrial and mining enterprises, petrochemical, metallurgy, and railway electrification. system.

Although the application of GIS has many advantages as mentioned above, it also has the disadvantages of complicated maintenance work, fine process requirements, and serious consequences in case of failure.

The maintenance method of GIS is developing in the direction of Condition Based Maintenance (CBM), and online monitoring and fault diagnosis technology are the important basis of condition maintenance. Partial discharge monitoring is the most effective method for GIS on-line monitoring. Partial discharge is not only a symptom and manifestation of GIS insulation deterioration, but also a cause of further insulation deterioration. On-line partial discharge monitoring of GIS, due to the particularity of GIS structure, can be divided into external electrode method, grounding wire electromagnetic coupling method, embedded electrode method in insulator, ultra-high frequency detection method and other electrical on-line monitoring methods and mechanical vibration monitoring method, Non-electricity on-line monitoring methods such as gas detection method and optical detection method. However, the current GIS partial discharge online monitoring device cannot evaluate its on-site anti-interference ability, partial discharge location ability and fault mode recognition ability before installation, and the power system operation department cannot fully trust the information displayed by the online monitoring device. As a result, the power outage maintenance can only be verified after a problem occurs in the GIS. This situation is not conducive to the safe and reliable operation of the power system, and is also not conducive to the realization of "conditional maintenance".

Therefore the technical problem to be solved by the present invention is:

1. How to detect the GIS partial discharge online monitoring device before use, and further correct it, so as to provide completely credible online monitoring results to the power department.

2. How to judge whether the GIS partial discharge on-line monitoring device can meet the needs of actual work before use, for example, whether it can withstand the impact of lightning, whether the on-line monitoring system can normal work.

Contents of the invention

In view of the above-mentioned technical problems to be solved, the present invention builds an open GIS partial discharge on-line monitoring device performance detection system, which can install different on-line monitoring devices, and use calibrated measuring instruments for value transfer. The accuracy of online monitoring devices with different methods or principles is tested.

Further, the present invention provides a method for checking the function of the GIS partial discharge on-line monitoring device by using the above-mentioned performance testing system, which can perform function checking and calibration on various GIS partial discharge on-line monitoring devices.

In this regard, the technical solution of the present invention is: a performance detection system of a GIS partial discharge on-line monitoring device, said system comprising:

The 250kV transformer and supporting measurement and control system are used to provide high voltage source; and the transformer and supporting measurement and control system include a 250kV high voltage divider, which is used to divide the high voltage provided by the 250kV transformer so as to reduce it to a low voltage for convenience Measurement;

GIS pipeline, the voltage level of the GIS pipeline is 110kV, single-phase, and there are bushings on both sides of the GIS pipeline, and there is also a disconnector in the pipeline, and each section of the pipeline is a detachable independent structure, under 87kV Partial discharge level <5pC;

The DC screen provides power for the control mechanism of the isolating switch inside the GIS pipeline;

Partial discharge measuring device, the partial discharge measuring device is based on the pulse current method, calibrated partial discharge measuring device, for measuring the partial discharge in the GIS pipeline;

It is characterized in that: the GIS pipeline uses the GIS partial discharge on-line monitoring device installed inside or outside the GIS to monitor various conventional insulation defects simulated in the GIS pipeline, and the monitoring results are compared with those measured by the partial discharge measuring device. The results are compared, so as to achieve the purpose of testing the performance of the GIS partial discharge on-line monitoring device.

Since various conventional insulation defects are simulated in the GIS pipeline, different on-line monitoring devices can be connected and tested. The GIS pipeline with independent structure not only has the characteristics of easy disassembly, but also facilitates the simulation of various insulation defects. In this way, the performance detection system can simulate different insulation defects, and can detect different on-line monitoring devices.

In addition, the present invention also discloses a method for checking the function of a GIS partial discharge on-line monitoring device by using the performance testing system: the method includes the following steps:

a. Connect the GIS partial discharge on-line monitoring device to be detected to the GIS pipeline according to its on-site installation method, simulate different modes of insulation defects in the pipeline, and apply voltage to the GIS pipeline through the bushing , recording the partial discharge inception voltage measured by the on-line monitoring device, and assessing its ability to identify defect modes and locate defect points;

b. use the partial discharge measuring device based on the pulse discharge method to monitor the partial discharge of the GIS pipeline equipped with the GIS partial discharge on-line monitoring device to be checked, and record the partial discharge inception voltage, which is recorded with the on-line monitoring device Compare the partial discharge inception voltage and compare the sensitivity of the two.

Description of drawings

Fig. 1 is a performance detection system diagram of an exemplary GIS partial discharge on-line monitoring device according to the present invention;

Fig. 2 is the front view of a kind of exemplary GIS pipeline according to the present invention;

Fig. 3 is a top view of the GIS pipeline shown in Fig. 2 .

Among them, 1.250KV transformer and supporting measurement and control system, 2. Protection resistor, 3. GIS pipeline, 4. Simulated insulation defect model, 5. Bushing, 6. Online monitoring interface, 7. Online monitoring device, 8. External antenna sensor , 9. Isolation switch.

detailed description

The technical solutions of the present invention will be described below in conjunction with the accompanying drawings in the form of embodiments.

Example 1:

Referring to accompanying drawing 1, for GIS partial discharge on-line monitoring device performance detection system of the present invention, wherein 250kV transformer and supporting measurement control system 1 include 250kV high-voltage voltage divider, are used for dividing the high voltage that described 250kV transformer provides The voltage is reduced to a low voltage for easy measurement, and it is intended to build a high-voltage power supply environment for the performance detection system.

In an example, the parameters of a 250kV transformer are: input voltage: AC: 0-400V; output voltage: 0-250kV, capacity: 250kVA; impedance voltage: <8%; no-load loss: <5%; voltage distortion: < 3%.

The 250kV transformer and supporting measurement and control system 1 include a 250kV high-voltage divider, which is used to divide the high voltage. In one example, the parameters of the 250kV high-voltage divider are: the divider ratio is 1000:1; the measurement voltage is AC : 0～250kV; Accuracy: 1.5 grade; Working temperature: -25℃～40℃. The protection resistor 2 provides overvoltage protection for the transformer, preventing the transformer from being damaged by a sudden large current in the test.

As shown in Figures 2 and 3, the GIS pipeline 3 is an open platform with a voltage level of 110kV; single-phase, with bushings 5 on both sides for pressurization and external connection to other equipment, and each section of the pipeline is a detachable independent structure , which is convenient to put into the simulated insulation defect model 4.

Further, in an example, the simulated insulation defect may simulate various conventional insulation defects, including but not limited to typical discharge types such as burrs, metal suspensions, and the like.

Further, the pipeline can be provided with an opening-type online monitoring interface 6, and the pipeline can be opened through this interface in the absence of SF6, so as to be conveniently put into the simulated insulation defect model.

The GIS pipeline 3 is provided with an isolating switch 9, and the partial discharge level of the GIS pipeline 3 at 87kV is <5pC. The performance detection system also includes a calibrated partial discharge measuring device to measure the partial discharge in the GIS pipeline 3, and record the partial discharge inception voltage, compared with the partial discharge inception voltage recorded by the on-line monitoring device 7, compare the two sensitivity.

The performance detection system also includes a DC screen, which is mainly used to provide power for the control mechanism of the isolating switch in the GIS pipeline.

In one example, the DC screen includes a DC power supply box, a microcomputer monitoring system, a charging module, a battery, etc., and the manufacturing standard is GB/T19826-2005; the main parameters of the DC power supply box: input voltage: AC 220V±15%; output voltage: DC 220V; output current: maximum 9A; voltage regulation accuracy: ≤±0.5%; ambient temperature: -10°C--+40°C. Main parameters of the battery module: input voltage: AC 220V ± 15%; output current: maximum 10A; output voltage: DC 220V; voltage regulation accuracy: ≤ ± 0.5%; ambient temperature: -10°C--+40°C. Battery capacity: 40Ah Microcomputer monitoring system Main functions: overvoltage, undervoltage alarm function, battery management function, output control, etc.

For the above-described embodiment, the calibrated partial discharge measuring device can also monitor the partial discharge in the pipeline, record the partial discharge initial voltage, and the monitoring result is different from the partial discharge of the on-line monitoring device 7 loaded in the performance detection system. The initial voltages are compared in order to calibrate the online monitoring device 7 .

As mentioned above, in another embodiment, the GIS pipeline can have an online monitoring interface 6, which is in the form of an opening to put in the sensor, which is a part of the online monitoring device 7, through which the The sensor is more convenient to install the GIS partial discharge on-line monitoring device inside or outside the GIS. In addition to the sensor placed in the GIS pipeline, the on-line monitoring device may also include an external antenna sensor to monitor the partial discharge of different forms of the GIS pipeline.

Example 2:

The structure of this embodiment is the same as that of Embodiment 1, the difference is that the partial discharge device for calibrating the online monitoring device 7 can be various commonly used partial discharge devices. Preferably, the partial discharge device is a partial discharge measurement device based on a pulse current method. In one example, the partial discharge measurement device based on the pulse current method is a traceable device, and the specific parameters are: 2 channels, measurement sensitivity: 0.1pC; measurement frequency band: 10kHz-500kHz; pulse resolution time: less than 100μs, gain range -20dB～+40dB four levels adjustable; calibration pulse generator: output standard pulse rising edge less than 60ns, falling edge greater than 100μs, calibration charge error <±5%.

Example 3:

The structure of this embodiment is the same as that of Embodiment 1, only the type of the online monitoring device 7 is further limited. The online monitoring device 7 can be an online monitoring device of an electrical online monitoring method or an online monitoring device of a non-electrical online monitoring method. Among them, the electrical online monitoring methods are external electrode method, ground wire electromagnetic coupling method, embedded electrode method in insulator, and ultra-high frequency detection method. Among them, the non-electrical on-line monitoring methods include mechanical vibration monitoring, gas detection, optical detection and other non-electrical on-line monitoring methods. As mentioned above, the online monitoring device can monitor the partial discharge in the GIS pipeline, and it has an internal sensor, it may also have an external sensor, or it may not have an external sensor.

Example 4:

The structure of this embodiment is the same as that of Embodiment 1, except that the simulated insulation defect model is further defined. The simulated insulation defect models include the physical model of free metal particle defects, the physical model of metal pollution defects, the physical model of air gap defects between insulators and inner conductors, and the physical models of metal protrusion defects. These are just a set of specific models that exist in the prior art. These conventional types of models, these models themselves are not where the innovation of the present invention lies. In actual testing, the selected simulated insulation defect models include one or more of the above defect models.

It should be understood that the embodiments 1-4 can be combined with each other.

Example 5:

In this embodiment, a method for checking the functionality of various on-line monitoring devices using the GIS partial discharge on-line monitoring device performance detection system built in embodiments 1-4 is disclosed. Firstly, the GIS partial discharge on-line monitoring device 7 to be inspected is installed on the GIS pipeline 3 according to its on-site installation method. As mentioned above, it can be installed inside or outside the GIS. The typical insulation defect models 4 of different modes are respectively simulated in the GIS pipeline, voltage is applied to the pipeline 3 through the bushing 5, the partial discharge inception voltage measured by the on-line monitoring device 7 is recorded, and it is checked whether the on-line monitoring device 7 can identify the defect mode , further, if the online monitoring device has a positioning function, check whether it can locate the defect point, record the actual defect point position and the position located by the online monitoring device's own positioning function. For example, the partial discharge measuring device based on the pulse discharge method monitors the partial discharge of the GIS pipeline 3, and records the partial discharge inception voltage, and compares the partial discharge inception voltage with the on-line monitoring device 7 to measure the sensitivity of the two, and can use For the calibration of the online monitoring device 7.

Embodiment 6:

This embodiment is basically the same as Embodiment 5, except that it further tests the performance of the online monitoring device 7 under extreme working conditions. The extreme working condition is lightning impulse experiment. The steps for this test are:

Install the GIS partial discharge on-line monitoring device 7 to be inspected on the GIS pipeline 3 according to the on-site operation mode, apply a standard lightning impulse to the pipeline, the voltage is 550kV, and the positive and negative polarities are 3 times each, and judge whether the online monitoring device 7 can be used after this experiment. normal work.

Embodiment 7:

This embodiment is basically the same as Embodiment 5, the difference is that it further monitors the characteristics of the GIS pipeline isolating switch, and judges whether the on-line monitoring device 7 can work normally in the capacitive small current experiment of the isolating switch. The steps are: connect the GIS partial discharge on-line monitoring device 7 to be inspected to the GIS pipeline 3 according to the on-site operation mode, connect the bushing 5 at one end of the GIS pipeline 3 to a capacitor with a capacitance of 5000pF, and apply a voltage of 63.5kV to the other end 5, Simultaneously operate the isolating switch to open and close, open and close 3 times, and judge whether the online monitoring device 7 can work normally in this experiment and after the experiment.

It should be understood that Embodiments 5-7 can be combined with each other. For embodiments 6 and 7, when they are combined with embodiment 5, there are no special requirements for the execution sequence of embodiments 6 and 7, as long as the GIS partial discharge on-line monitoring device to be inspected is installed.

It can be seen that the present invention establishes a performance detection system of a GIS partial discharge on-line monitoring device. In particular, by establishing the GIS pipeline, the normal characteristic insulation failure mode inside the GIS is simulated, as well as various overvoltage situations that may be encountered during the operation of the GIS are simulated. Since various on-line monitoring devices can be installed on the GIS pipeline, the present invention can detect the performance of the partial discharge on-line monitoring device installed on the GIS, such as detecting the accuracy of its partial discharge location and identification of the discharge defect mode , and testing its anti-interference ability, of course, it is also possible to check whether the insulation performance of the GIS is affected after the online monitoring device is installed. Through the comprehensive detection of the performance of the GIS partial discharge on-line monitoring device, the invention improves the quality and reliability of the on-line monitoring device connected to the network, and provides a reliable on-line monitoring device for the electric power operation department. This is conducive to improving the reliability of the data monitored by the GIS partial discharge on-line monitoring device in the later stage, and is also conducive to the accurate assessment of the insulation status of the GIS, which is conducive to timely and accurate troubleshooting and ensures the safe and reliable operation of the power system .

For example: 1. Establish a set of standard square wave standard source, which can test the basic performance of the equipment under test in the laboratory environment. 2. In the laboratory environment, compare the tested equipment with the laboratory standard source. The comparison experiment was carried out on samples with artificially manufactured defects (the defects may be those mentioned above, but are not limited thereto). Under the environmental conditions of the laboratory, the partial discharge, waveform and defect identification functions of the tested equipment were assessed; 3. Under the on-site interference environment, a comparative experiment was carried out between the tested equipment and the standard source. The comparison experiment here is still carried out on samples with artificial manufacturing defects, but in the field interference environment, the partial discharge, waveform and defect recognition function of the tested equipment are assessed.

In view of this, in another embodiment, the present invention discloses a method for checking the function of a GIS partial discharge on-line monitoring device using the aforementioned performance testing system, including the following steps:

a. Connect the GIS partial discharge on-line monitoring device to be detected to the GIS pipeline according to its on-site installation method, simulate different modes of insulation defects in the pipeline, and apply voltage to the GIS pipeline through the bushing , recording the partial discharge inception voltage measured by the on-line monitoring device, and assessing its ability to identify defect modes and locate defect points;

b. use the partial discharge measuring device based on the pulse discharge method to monitor the partial discharge of the GIS pipeline equipped with the GIS partial discharge on-line monitoring device to be checked, and record the partial discharge inception voltage, which is recorded with the on-line monitoring device Compare the partial discharge inception voltage and compare the sensitivity of the two.

Compared with the previous embodiments related to the performance detection system, this embodiment focuses on the corresponding method of using the performance detection system mentioned above to perform functional inspection on the GIS partial discharge on-line monitoring device.

Preferably, in another embodiment, the method further includes the steps of:

c. Apply a standard lightning impulse to the GIS pipeline equipped with the GIS partial discharge on-line monitoring device to be tested, with a voltage of 550kV and three times of positive and negative polarities, and then judge whether the GIS partial discharge on-line monitoring device can work normally.

Preferably, in another embodiment, the method further includes the steps of:

d. The bushing at one end of the GIS pipeline equipped with the GIS partial discharge on-line monitoring device to be checked is connected with a capacitor with a capacity of 5000pF, and a voltage of 63.5kV is applied to the bushing at the other end, while operating the The isolating switch is opened and closed for 3 times, and it is judged whether the GIS partial discharge online monitoring device described in this step and/or after the step can work normally.

For the above c and d related embodiments, the above steps c and d can respectively carry out the lightning impact experiment and the isolating switch opening and closing capacitive small current experiment on the GIS local on-line monitoring device, and judge whether the on-line monitoring device can operate under various conditions. Whether it can be used normally. There are no specific requirements for the sequence of steps c and d of the experiment, as long as the GIS local monitoring device to be tested is installed, it can be carried out.

The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be assumed that the specific embodiments of the present invention are limited thereto, and the above embodiments can be combined with each other. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the present invention and protected by the submitted claims. scope.

Claims (2)

1. a GIS local discharge on-line monitoring device performance detecting system, described system comprises:

250kV transformer and supporting Measurement and Control System, for providing high-voltage power supply; And described transformer and supporting Measurement and Control System comprise 250kV high-voltage bleeder, carry out dividing potential drop for the high pressure that described 250kV transformer is provided, be convenient to measure to reduce to low-voltage;

GIS pipeline, the electric pressure of described GIS pipeline is 110kV, single-phase, and the both sides of described GIS pipeline have sleeve pipe, in pipeline, also with isolating switch, each section of described pipeline is dismountable absolute construction, local discharging level < 5pC under 87kV;

Direct current cabinet, for the controlling organization of the isolating switch of described GIS pipe interior provides power supply;

Partial-discharge measuring device, described partial-discharge measuring device is based on partial-discharge measuring device pulse current method, calibration, for the ducted shelf depreciation of GIS is measured;

It is characterized in that: the utilization of described GIS pipeline is arranged on the inner or outside GIS local discharge on-line monitoring device of GIS to the various conventional insulation defect of simulating in GIS pipeline, monitor, the result of the result of monitoring and the measurement of described partial-discharge measuring device is compared, thereby reach the object that detects GIS local discharge on-line monitoring device performance;

Put into analog insulation defect model at described GIS pipeline, to simulate the shelf depreciation situation under this defect model;

The described analog insulation defect model of putting into comprises the one or more of the group that is made up of void defects model between free metal particle defects model, metallic pollution defect model, insulator and inner wire and metal protrusion defect model, putting into different models is in order to simulate different shelf depreciation situations, recognition function and positioning function with examination on-Line Monitor Device to different defect modes, described recognition function refers to the recognition capability to above-mentioned model, and described positioning function refers to the stationkeeping ability to defect point; Wherein:

Described partial-discharge measuring device is for tracing to the source metering device, and its parameter is: 2 passages, measure sensitivity: 0.1pC; Measure frequency band: 10kHz ~ 500kHz; Pulse resolving time: be less than 100 μ s, gain ranging-20dB ~+40dB fourth gear is adjustable; Calibration pulse generator: outputting standard rising edge of a pulse is less than 60ns, trailing edge is greater than 100 μ s, calibration quantity of electric charge error < ± 5%;

Described on-Line Monitor Device is the on-Line Monitor Device of electricity on-line monitoring method or non-electricity on-line monitoring method;

Described electricity on-line monitoring method is pre-buried electrode method or hyperfrequency detection method in outer electrode method, earth connection Electromagnetic coupling method, insulator;

Described non-electricity on-line monitoring method is mechanical oscillation monitoring method, gas detection method or optical detection.

2. a method of utilizing the performance detecting system described in claim 1 GIS local discharge on-line monitoring device to be carried out to functional check: comprise the steps:

A. GIS local discharge on-line monitoring device to be detected is pressed to its on-the-spot mounting means; be connected with described GIS pipeline; in described pipeline, simulate respectively the insulation defect of different mode; give described GIS pipeline making alive by described sleeve pipe; record the partial discharge inception voltage that described on-Line Monitor Device records, and examine its identification to defect mode and the stationkeeping ability of defect point;

B. use the shelf depreciation that the GIS pipeline of GIS local discharge on-line monitoring device to be checked is housed described in the described partial-discharge measuring device monitoring based on pulsed discharge method, and record partial discharge inception voltage, with partial discharge inception voltage's contrast that described on-Line Monitor Device records, relatively both sensitivity;

C. the described GIS pipeline that GIS local discharge on-line monitoring device to be checked is housed is applied to standard lightning impulse, voltage 550kV, each 3 times of positive-negative polarity, then judges whether described GIS local discharge on-line monitoring device can normally work;

D. connect at the described sleeve pipe of one end of the described GIS pipeline that GIS local discharge on-line monitoring device to be checked is housed the capacitor that capacitance is 5000pF, on the described sleeve pipe of the other end, apply voltage 63.5kV, operate described isolating switch folding simultaneously, folding 3 times, judgement in this step and/or after step described GIS local discharge on-line monitoring device whether can normally work.