CN203178464U - GIS partial discharge online monitoring calibrator - Google Patents

Abstract

The utility model relates to a GIS partial discharge online monitoring calibrator, which comprises a pulse signal source and a transmitting antenna, wherein the pulse signal source can send an analog signal source, and the transmitting antenna is connected with the pulse signal source and injects the analog signal source into a GIS cavity. The calibrator can check the sensitivity of a partial discharge UHF (ultra high frequency) detection device under test in detecting injection signals on line based on an ultra high frequency method. The GIS partial discharge online monitoring calibrator is simple in structure and convenient to operate.

Description

GIS partial discharge monitoring tester

Technical field

The utility model relates to GIS shelf depreciation field, particularly a kind of GIS partial discharge monitoring tester.

Background technology

GIS(all-closed gas insulating combined switch equipment) have floor area little, be subjected to external environmental condition to influence little, reliability advantages of higher, in China's urban distribution network, use in a large number.The GIS equipment that present China puts into operation has in early days entered the multiple phase of fault; And the GIS equipment producer overload that also causes at a high speed of power network development is produced, and on-the-spot installation condition also is difficult to effectively be ensured, has increased newly the put into operation out of order probability of GIS equipment and risk widely.Produced huge contradiction between the requirement that improves day by day to electric network reliability of this and the current whole society.The safe and reliable operation that the online detection that an urgent demand development of operation power department is advanced and Condition-Based Maintenance Technology ensure high voltage electric power equip ment.

Office is placed on the measurement data of line, off-line monitoring and checkout equipment as the important indicator of judging the primary equipment operating condition, its correctness has directly influenced the correct judgement to the primary equipment operating condition, if there is the shelf depreciation problem in primary equipment, and on-line monitoring equipment fails to find or the data monitored precision is lower, fail to cause that the technician enough payes attention to, often cause the little hidden danger of primary equipment to develop into the accident of primary equipment; There is not the shelf depreciation problem in primary equipment, and the on-line monitoring equipment abnormal data that takes place frequently, misleading the technician carries out unnecessary interruption maintenance, certainly will cause the waste of human and material resources, financial resources, and also stability and the reliability to operation of power networks caused influence.

(UHF:300MHz ~ 3GHz) is exactly a kind of method that the UHF electromagnetic wave that utilizes shelf depreciation to give off detects to the superfrequency method.Studies show that the GIS shelf depreciation will produce very steep pulse current, and to around the electromagnetic wave of the multiple frequency of radiation, receive the wherein electromagnetic wave of 300 ~ 3000MHz by the UHF sensor, can realize detection and location to shelf depreciation.This method has characteristics such as antijamming capability is strong, sensitivity height, and this non-contacting metering system is safer for secondary device and personnel, and system architecture is simple, is particularly suitable for on-line monitoring, thereby has remarkable advantages than other method.In recent years, shelf depreciation UHF detects has become the focus that numerous researchers pay close attention to, and is widely used on the power equipments such as GIS, electric power GIS, cable and generator.

Yet because shelf depreciation UHF detection technique is perfect not to the utmost in theory and engineering application facet, particularly the construction of correlation technique standard criterion extremely lags behind; It is different that simultaneously the product that equipment vendors provide is put in the office of lot of domestic and foreign, and quality is uneven.The equipment of some producers detects poor effect at the scene because technology does not pass a test, and occurs false alarm often, fails to report alert phenomenon, and the serious threat of this situation is to the sound development of whole on-line monitoring industry.Unified standard and the scientific and effective means of shortage that have its source in of the problems referred to above are carried out quantitatively evaluating to the rig-site utilization performance of shelf depreciation UHF pick-up unit.

External aspect, people such as the Judd of Britain Strathclyde university take the lead in utilizing the simple and easy gtem cell of TEM transmission line and terminal unmatched to study the time-domain measurement technique of sensor characteristic, avoid the influence of reflection echo by controlling the acquisition time window, realize the demarcation to shelf depreciation UHF sensor.The Shinnobu Ishigami of Japan also utilizes the TEM waveguide that electric-field sensor is demarcated, and its thinking also is based on traditional frequency sweep method, and cost is higher.The David Gautschi of Switzerland etc. has proposed a kind of scaling method based on cone antenna, but its calibration system employing is that large tracts of land aluminium sheet and cone antenna are measured in large space, is vulnerable to external environmental interference, is not suitable as standardized test equipment.More than mostly research is to be confined to the sensor characteristic to UHF, lacks the research to the performance index of UHF pick-up unit.

Up to now, for the on-site proving problem of UHF pick-up unit, except CIGRE has recommended the criterion of oneself, do not form the effectively evaluating method of making peace in the world yet, domestic this respect also is in the blank stage.Carrying out the on-the-spot sensitivity of shelf depreciation UHF pick-up unit and demarcate research, set up the on-the-spot sensitivity verification of partial-discharge ultrahigh-frequency standard, is the task of top priority that promotes this technical development conscientiously.Therefore, under such background, carry out based on the research of the GIS partial discharge monitoring system check instrument of superfrequency principle very necessary.

The utility model content

The purpose of this utility model provides a kind of GIS partial discharge monitoring tester, can realize playing a game at the GIS of laboratory condition and on-the-spot operating 110kV and 220kV putting the check of UHF pick-up unit.

In order to achieve the above object, the technical solution of the utility model provides a kind of GIS partial discharge monitoring tester, it comprises: the pulse signal source that can send simulation signal generator, and be connected with described pulse signal source simulation signal generator is injected emitting antenna in the GIS cavity, the sensitivity when described tester can be put the UHF pick-up unit signal is injected in online detection based on the superfrequency method office to be measured is checked.

When described tester is arranged on be used to a true single-phase GIS cavity place that obtains with the injection signal source amplitude of true discharge capacity equivalence, and when being provided with C1 and C2 in the GIS cavity at 2 and being provided with the shading ring perforate of disc insulator or open type insulator separately, the output signal of described pulse signal source is shading ring tapping or the open type insulator place that sends to C1 point disc insulator by an external sensor.

Be used for on-the-spot the 2nd GIS cavity place that the sensitivity of UHF pick-up unit to be measured is checked when described tester is arranged on one, and the 2nd GIS cavity is when being provided with adjacent shading ring the disc insulator of perforate or open type being arranged,

The simulation signal generator of the known amplitude of described pulse signal source output by being placed on one of them open type disc insulator or the emitting antenna of tapping of the disc insulator of shading ring being arranged, is injected in the 2nd GIS cavity; UHF pick-up unit to be measured is by being arranged on an open type disc insulator or having the external UHF sensor of tapping of the disc insulator of shading ring to detect the signal of injection.

GIS partial discharge monitoring tester described in the utility model, equipment needed thereby is simple in structure, arrangement convenience, Validity Test is carried out in the sensitivity of putting the UHF pick-up unit of can playing a game.

Description of drawings

Fig. 1 is the pulse signal source synoptic diagram of tester in the GIS partial discharge monitoring tester described in the utility model;

Fig. 2 is to use the test flow chart of tester described in the utility model;

Fig. 3, Fig. 4 are respectively when carrying out the obtaining of equivalent verification amount in the utility model, the device arrangements synoptic diagram when adding high pressure when insulation defect discharge and injected pulse.

Embodiment

GIS partial discharge monitoring tester described in the utility model (hereinafter to be referred as tester) is applicable to the GIS(all-closed gas insulating combined switch equipment at laboratory condition and on-the-spot operating 110kV and 220kV) realize playing a game putting the check of UHF pick-up unit.It is a kind of equipment that the GIS shelf depreciation is carried out on-line monitoring based on the superfrequency method that the UHF pick-up unit is put in described office.Wherein, superfrequency refers to 300MHz ~ 3GHz.

Tester described in the utility model, mainly be provided with pulse signal source and emitting antenna, it detects principle is to inject signal by pulse signal source in the GIS cavity, puts the UHF pick-up unit with office to be measured again and detects this signal, judges the sensitivity of device to be measured accordingly.Wherein pulse signal source requires to produce stable, controlled and to each quasi-representative representative pulse signal that discharges.So-called representative, referring to signal source must have similarity preferably with the superfrequency radiation waveform of each quasi-representative local discharge signal, covers roughly the same spectral range and has suitable radiation intensity.The various typical structures of GIS also need to take into account for the influence of the propagation attenuation of signal simultaneously.

A kind of optimization technique parameter of setting for the pulse signal source of described tester in the utility model is: amplitude is adjustable at 2-100V, rising edge (20%-80%): 300ps; Fall time (80%-20%):＜4ns; Pulsewidth 4-100ns; Maximum impulse repetition frequency 5kHz; Power requirement 100-240,50-60Hz; Environment temperature+5 ℃～+ 40 ℃.The output waveform of this pulse signal source as shown in Figure 1.

With the emitting antenna that described pulse signal source is used, adopt and inject antenna.Preferred parameter is working band: 300 ~ 1500MHz; Standing-wave ratio (SWR) :≤3; Operating ambient temperature :-10～50 ° of C.Pulse signal sends by injecting antenna, is injected into the inside of GIS cavity via disc insulator.

The method of calibration of using tester described in the utility model to carry out, acquisition and sensitivity test two parts of mainly comprising equivalent verification amount, at first obtain the amplitude with the injection signal source of true discharge capacity equivalence, the signal of the simulation signal generator of known amplitude is injected the GIS cavity in the check test at the scene then, observe UHF pick-up unit to be measured whether can detect the UHF signal.Overall flow as shown in Figure 2.

Wherein, obtaining of equivalent verification amount described in the utility model is that one section cavity choosing true single-phase GIS experimentizes, and steps A is as follows:

It for example is the high-pressure conductor spine model that arranges that A-1, pressurization make the insulation defect 10(of C1 in the GIS cavity) the generation shelf depreciation, the shading ring tapping of the disc insulator at the C2 place in the GIS cavity or open type insulator 20 usefulness external sensors 30 reception signals, detect the discharge excited UHF signal of this defective A by the superfrequency detection method, and because Fig. 3 is seen in the oscillograph 40 output demonstrations that external sensor 30 connects.

A-2, remove voltage, shading ring tapping or open type insulator 20 at the disc insulator at C1 place, above external sensor 30 is attached to, the output of simulation signal generator 50 is received on this sensor, in the GIS cavity, inject signal, another external sensor 30 at the C2 place obtains UHF signal B, and shows by oscillograph 40 outputs, as shown in Figure 4.The output amplitude of regulating impulse signal source makes the deviation of UHF signal B and A in ± 20%, notes the output amplitude of signal source this moment.The shell of label 60 expression GIS cavitys.

Pressurization should make the value of signal A enough little under the situation suitable with signal B in the actual experiment.And in the present embodiment for deviate ± 20%th of signal A, B, the UHF system sensitivity check method of recommending with reference to CIGRE TF15/33.03.05 proposes.

On-the-spot sensitivity to UHF pick-up unit to be measured described in the utility model is checked, and is to carry out at real GIS, chooses cavity between the disc insulator that GIS goes up adjacent shading ring and have perforate or open type as test environment.

Checking procedure comprises:

B-1, emitting antenna is received in the output of pulse signal source, emitting antenna is positioned over the open type disc insulator or the tapping of the basin of shading ring is arranged, the parameter of impulse source (for example is set in the steps A fixed amplitude, pulsewidth, pulse repetition rate, repetition frequency 200Hz, pulsewidth 40ns, output voltage 46.8V), pulse signal injects the GIS cavity by emitting antenna through basin.

B-2, the external UHF sensor of placing UHF pick-up unit to be measured at adjacent disc insulator receive signal, open the UHF pick-up unit, if can detect the UHF signal, think that then the sensitivity of UHF pick-up unit is the level (the CIGRE standard recommendation is 5pC) of certain requirement.

The position that the pick-up unit placement is put in the pulse signal source drawn game does not have special requirement, under the sufficiently long situation of stube cable, generally is placed on GIS cavity next door and gets final product.

Claims (3)

1. a GIS partial discharge monitoring tester is characterized in that,

Comprise the pulse signal source that can send simulation signal generator, and be connected with described pulse signal source simulation signal generator is injected emitting antenna in the GIS cavity, the sensitivity when described tester can be put the UHF pick-up unit signal is injected in online detection based on the superfrequency method office to be measured is checked.

2. GIS partial discharge monitoring tester as claimed in claim 1 is characterized in that,

When described tester is arranged on be used to a true single-phase GIS cavity place that obtains with the injection signal source amplitude of true discharge capacity equivalence, and when being provided with C1 and C2 in the GIS cavity at 2 and being provided with the shading ring perforate of disc insulator or open type insulator separately, the output signal of described pulse signal source is shading ring tapping or the open type insulator place that sends to C1 point disc insulator by an external sensor.

3. GIS partial discharge monitoring tester as claimed in claim 2 is characterized in that,

Be used for on-the-spot the 2nd GIS cavity place that the sensitivity of UHF pick-up unit to be measured is checked when described tester is arranged on one, and the 2nd GIS cavity is when being provided with adjacent shading ring the disc insulator of perforate or open type being arranged,

The simulation signal generator of the known amplitude of described pulse signal source output by being placed on one of them open type disc insulator or the emitting antenna of tapping of the disc insulator of shading ring being arranged, is injected in the 2nd GIS cavity; UHF pick-up unit to be measured is by being arranged on an open type disc insulator or having the external UHF sensor of tapping of the disc insulator of shading ring to detect the signal of injection.

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