CN102305903A

CN102305903A - Partial discharge detection method for pulse current of electrified operation single phase integrated gas insulated switchgear (GIS)

Info

Publication number: CN102305903A
Application number: CN201110148583A
Authority: CN
Inventors: 王科; 赵现平; 谭向宇; 马仪
Original assignee: Yunnan Electric Power Test and Research Institute Group Co Ltd
Current assignee: Yunnan Electric Power Test and Research Institute Group Co Ltd
Priority date: 2011-06-03
Filing date: 2011-06-03
Publication date: 2012-01-04
Anticipated expiration: 2031-06-03
Also published as: CN102305903B

Abstract

The invention discloses a partial discharge detection method for pulse current of an electrified operation single phase integrated gas insulated switchgear (GIS). The method comprises the following steps of: performing uninterrupted power supply connection/disconnection partial discharge detection on the electrified operation single phase integrated GIS by a pulse current testing method; arranging an insulated metal shielding layer on the inner wall of the conventional GIS bus linkage segment cavity and leading a peripheral wire connection terminal out so as to detect the coupling capacitance of a return circuit; performing real-time uninterrupted power supply connection/disconnection of detection impedors on the metal shielding layer on which a GIS bus segment shell is insulated with the inner wall of the cavity through an insulation pad layer at the peripheral lead-out wire connection terminal and a bridging metal turn cap by a pulse current testing method; and monitoring the amplitude values of signals acquired by the detection impedors which can be assembled and disassembled on coupling capacitors at multiple GIS bus connection segments with the space of not more than 20m in an electrified way by using a background machine, so that the electrified operation single phase integrated GIS can be subjected to partial positioning detection. By the method, the technical problems of the access of the coupling capacitors and the electrified assembly and disassembly of the detection impedors are effectively solved, and then a classical pulse current partial discharge detection method is introduced into electrified operation, particularly the detection, positioning and estimation of the single phase integrated GIS; and the method has the advantages of sufficient basis and the like and is safe, reliable, simple, convenient and accurate.

Description

Pulse current detection method for local discharge on the single-phase one GIS of charging operation

Technical field

The invention belongs to the charged detection technique of electric system GIS equipment, especially be applicable to Partial Discharge Detection, location and the diagnostic method technical field of the single-phase one GIS of charging operation.

Background technology

GIS (gas insulated combined electrical equipment) equipment comprises isolating switch, bus, disconnector, electric current and voltage transformer (VT), grounding switch, lightning arrester, sleeve pipe and transition element etc.; And it all is assembled in the metal shell of a sealing, fill with SF6 gas to realize that conductor is to the reliable insulation between alternate, shell, fracture and fracture.Because of little, the operational reliability advantages of higher of its occupation of land, consumption is very big in electrical network.

Because the high cramped construction of GIS and totally-enclosed encapsulation add the gas isolated inherent characteristic of SF6, cause the power failure of GIS equipment can detect that parameter is limited, the runnability assessment can be few with reference to parameter; These involve a wide range of knowledge with the sudden power failure of GIS again and rush to repair telegram in reply difficulty etc., force the operations staff to strengthen reliable, the effectively actual demand of detection during its power failure, the charging operation are formed implacable contradiction.

Partial Discharge Detection is applied to GIS and goes up existing historical for many years as a kind of detection method of charging operation.But electrical measuring method wherein-pulse current detection mode has had widely, has had the application of reference standard in laboratory or the on-the-spot detection that has a power failure as a kind of Partial Discharge Detection mode of classics.Ultrasonic and ultrahigh frequency detection mode is put detection method as the grounding shell contact or the contactless office of on-the-spot charging equipment, and its technology is constantly being improved, improved and on actual motion equipment, carrying out a large amount of detections.But because calibration problem does not form effective examination criteria so far.

As the GIS equipment of scene operation, the confined condition that influences the application of pulse current detection method is that no suitable coupling capacitance is used for the installation and measuring impedance: indoor GIS equipment all is among the encapsulation, and the contact of external coupling capacitance can not be arranged; Outdoor have the place of exposing the high pressure lead wire owing to external insulation condition, limited, charged dismounting safe distance etc. the multiple factor that has a power failure, and can not provide a bench teat to test equipment and insert in the operational system.

Realistic problem based on above-mentioned existence; After the access that effectively solves coupling condenser and detecting the technological difficulties and reliability of the charged dismounting of impedance; Propose a kind of pulse current detection method for local discharge that is applied on the single-phase one GIS of charging operation, be incorporated in the charging operation GIS partial discharge monitoring in the hope of detection mode being put in the most classical office.

Summary of the invention

Because there are defective in ultrasonic, the high-frequency local discharging monitoring method that are applied on the charging operation GIS at aspects such as sensitivity, reliability, reference frames; The objective of the invention is to overcome the realistic problem of above-mentioned existence; Utilize the integrated access coupling condenser of design and detect the charged dismounting technology of impedance; Realize that online access detects impedance; And realize that through background computer the pulse current office of charging operation GIS puts detection at the scene, for detection, location and the diagnosis of GIS provides new approaches, new method.

The present invention realizes through following technical proposal.

Adopt the pulse current method of testing that the single-phase one GIS of charging operation is not had a power failure and disconnect the Partial Discharge Detection of line; The coupling capacitance that detects the loop is achieved through the metal screen layer of insulation being set and drawing the peripheral hardware terminals at existing GIS bus linkage section cavity inner wall; Insulating blanket and cross-over connection metal turncap that the metal screen layer of GIS bus section, busbar section shell and cavity inner wall insulation is drawn on the terminals through peripheral hardware realize that the pulse current method of testing detects not having a power failure in real time of impedance and disconnects line; Can charged dismounting be not more than through background computer monitoring on the many places GIS bus linkage section coupling capacitance of 20m and detect the signal amplitude size that impedance is obtained, can realize detection and localization is put in the office of the single-phase one GIS of charging operation in spacing.

Further set forth content of the present invention below in conjunction with accompanying drawing and instance.

Description of drawings

Fig. 1 is that the whole wiring schematic diagram of test is put in coupling capacitance structure of the present invention and pulse current office;

Fig. 2 is the side view of Fig. 1;

Fig. 3 draws the terminal structure synoptic diagram for peripheral hardware.

Embodiment

Pulse current detection method for local discharge on the single-phase one GIS of charging operation, the inventive method is:

1) adopts the pulse current method of testing that the single-phase one GIS of charging operation is not had a power failure and disconnect the Partial Discharge Detection of line;

2) coupling capacitance in detection loop is achieved through the metal screen layer of insulation being set and drawing the peripheral hardware terminals at existing GIS bus linkage section cavity inner wall;

3) metal screen layer of GIS bus section, busbar section shell and cavity inner wall insulation insulating blanket and the cross-over connection metal turncap of drawing on the terminals through peripheral hardware realizes that the pulse current method of testing detects not having a power failure in real time of impedance and disconnects line;

4) can charged dismounting be not more than on the many places GIS bus linkage section coupling capacitance of 20m through background computer monitoring and detect the signal amplitude size that impedance is obtained, can realize detection and localization is put in the office of the single-phase one GIS of charging operation in spacing.

See Fig. 1, Fig. 2, GIS bus linkage section is made up of shell 1, central conductor leader 2 among the figure.Through the metal screen layer 3 that cross-over block 4 has filled up is set at the GIS cavity inner wall, constitute incorporate coupling capacitance device with central conductor leader.5 is the peripheral hardware terminals that the coupling capacitance device is effectively drawn, and seals in the detection impedance 7 of ground connection 8 through lead wire 6.Pulse current office puts method of testing and is changed to backstage monitoring machine 10 through the live signal that signal cable or optical fiber 9 extract detection impedance 7, to accomplish the real-time monitoring of whole office discharge signal.

See Fig. 3, the figure shows peripheral hardware and draw the terminal structure synoptic diagram.This figure is the enlarged diagram of peripheral hardware terminals 5 that the coupling capacitance device is effectively drawn.Insulating component 11 through integral body can be effectively with metal screen layer exit 12 and GIS bus linkage section shell exit 13 electrical isolation, and cylindric 11,12,13 terminals are provided with screw thread.Change in location through the metal turncap 14 that is of convenient length can realize: short circuit metal screen layer 3 was to ground state during measurement was put in non-office; Electrical isolation metal screen layer and ground during the measurement are put in office, form coupling condenser, realize the measurement state.For guaranteeing the safety of hot line job under the metering system, metal turncap 14 can screw out to the end (away from GIS grounding shell direction) after the detection impedance 7 that seals in ground connection; Metal turncap 14 should be screwed into the end (near GIS grounding shell direction) before the detection impedance 7 of removing ground connection.Be provided with the detection impedance that metal screen layer exit jack 15 can conveniently seal in ground connection.

Claims

1. the pulse current detection method for local discharge on the single-phase one GIS of charging operation is characterized in that this method is: 1) adopt the pulse current method of testing that the single-phase one GIS of charging operation is not had a power failure and disconnect the Partial Discharge Detection of line; 2) coupling capacitance in detection loop is achieved through the metal screen layer of insulation being set and drawing the peripheral hardware terminals at existing GIS bus linkage section cavity inner wall; 3) metal screen layer of GIS bus section, busbar section shell and cavity inner wall insulation insulating blanket and the cross-over connection metal turncap of drawing on the terminals through peripheral hardware realizes that the pulse current method of testing detects not having a power failure in real time of impedance and disconnects line; 4) can charged dismounting be not more than on the many places GIS bus linkage section coupling capacitance of 20m through background computer monitoring and detect the signal amplitude size that impedance is obtained, can realize detection and localization is put in the office of the single-phase one GIS of charging operation in spacing.