CN102072828B

CN102072828B - Online test method for mechanical characteristic of SF6 interrupter

Info

Publication number: CN102072828B
Application number: CN 200910199061
Authority: CN
Inventors: 董黎明; 徐凤德
Original assignee: Shanghai Baosteel Equipment Maintenance Co Ltd
Current assignee: Shanghai Baosteel Equipment Maintenance Co Ltd
Priority date: 2009-11-19
Filing date: 2009-11-19
Publication date: 2013-08-28
Anticipated expiration: 2029-11-19
Also published as: CN102072828A

Abstract

The invention discloses an online test method for the mechanical characteristic of an SF6 interrupter. The method comprises the following steps of: switching on a ground switch of a lower pile head of the SF6 interrupter to make the three-phase contacts of the lower pile head of the interrupter join in parallel and grounded; switching on an isolating switch of an upper pile head of the SF6 interrupter to switch on a power failure bus; switching on a ground switch of the power failure bus and disconnecting the ground wire of the ground switch with the ground; connecting a mechanical characteristic tester between the ground wire of the ground switch and the ground; and respectively connecting three resistance capacity coupling circuits between the three phases of the power failure bus and the ground. By the method, the online test of the mechanic characteristic of the SF6 interrupter can be performed, so the normal operation of a high voltage power supply and distribution system is guaranteed, harm to human bodies and damage to test equipment are avoided, and the defect that the SF6 interrupter can only be tested offline is overcome.

Description

The online test method of SF6 breaker mechanic property

Technical field

The present invention relates to the online test method of a kind of SF6 breaker mechanic property.

Background technology

The SF6 isolating switch is a kind of gas-insulated switch (GIS), is full-enclosed structure, and it is widely used in the high pressure power supply-distribution system; The SF6 isolating switch is reliable, is considered to a kind of non-maintaining product; But in power supply-distribution system since all kinds of possible faults take place and estimate fault to the influence of isolating switch, and guarantee stable, the safe operation of power supply-distribution system, also need isolating switch is made mechanical characteristic test, and the maintenance of SF6 isolating switch also is after the overhaul of SF6 isolating switch off-line it to be made mechanical characteristic test usually, has caused the stoppage in transit of power supply-distribution system; Mechanical characteristic test generally comprises:

Time: contact closes/opening time, the three-phase same period, homophase time that cooperates of switching and the main fracture of the same period, bounce time and number of times, auxiliary switch not,

Speed: the average velocity of any definition phase on average velocity, firm branch/resultant velocity, maximal rate and the stroke curve,

Displacement: stroke, open distance, the excess of stroke, overshoot stroke,

Reclosing: bounce time, metal short circuit time, no current interval time, reclosing value interval time of adjusting arbitrarily,

Operation voltage: the operation voltage value of adjusting arbitrarily or full-automatic low-voltage test,

Other: comprehensive waveform, the isolating switch that switch motion once can obtain each input signal (time, speed, stroke, spring number of times) close/peak value of switching winding electric current, pulse width etc.

And above-mentioned mechanical characteristic test all need adopt each contact that tester connects the SF6 isolating switch obtaining corresponding test signal, thereby obtains related data to judge the performance of isolating switch; But the SF6 isolating switch is full-enclosed structure, is generally the double-bus method of operation when it is online, and as shown in Figure 1, SF6 isolating switch 1 is by the first disconnector DS _AWith the second disconnector DS _BConnect first bus 2 and second bus, 3, the first buses 2 and second bus 3 respectively respectively by the first grounding switch ES _A, ground wire 4 and the second grounding switch ES _B, ground wire 5 ground connection, the output terminal of SF6 isolating switch 1 is by the 3rd grounding switch ES ground connection; When therefore the SF6 isolating switch was online, tester can't insert the corresponding contact of isolating switch, thereby can't implement mechanical characteristic test.The SF6 isolating switch can be a bus operation at thread test simultaneously, carry out under the condition that another bus has a power failure, but owing to be the high pressure power supply-distribution system, in this process, the power failure bus will produce the induced voltage of 500V, and test will cause the injury of human body and the scaling loss of testing equipment; Two whole stoppages in transit of bus then to be equivalent to off-line operation, cause comprehensive power failure, produce great economic loss.

Summary of the invention

Technical matters to be solved by this invention provides the online test method of a kind of SF6 breaker mechanic property, utilize this method can implement the SF6 breaker mechanic property at thread test, guaranteed the normal operation of high pressure power supply-distribution system, and in process of the test, avoided human injury and testing equipment scaling loss, overcome the defective that the SF6 isolating switch can only off-line testing.

For solving the problems of the technologies described above, the online test method of SF6 breaker mechanic property of the present invention, the SF6 isolating switch is connected first bus and second bus respectively by first disconnector and second disconnector, first bus and second bus are respectively by first grounding switch, ground wire and second grounding switch, ground connection, the output terminal of SF6 isolating switch is by the 3rd grounding switch and ground connection, the operation of first bus, second bus has a power failure; This method comprises the steps:

Step 1, with the 3rd grounding switch closure, this moment, the SF6 isolating switch was with respect to the also ground connection in parallel of pile crown under one group of three-phase contact of second bus, closed second disconnector is connected second bus and SF6 isolating switch with respect to the last pile crown of one group of three-phase contact of second bus;

Step 2, with the second grounding switch closure, remove the ground wire of second grounding switch and being connected of ground simultaneously, this moment the SF6 isolating switch with respect to the last pile crown of one group of three-phase contact of second bus respectively with the ground wire UNICOM of second grounding switch;

Step 3, the testing mechanical characteristic instrument is inserted between the ground wire and ground of second grounding switch, the ground wire of testing mechanical characteristic instrument this moment by second grounding switch, second grounding switch, second bus, second disconnector, SF6 isolating switch with respect to the last pile crown of one group of three-phase contact of second bus, SF6 isolating switch with respect to constituting the loop between the following pile crown of one group of three-phase contact of second bus and the ground;

Step 4, one group of resaistance-capacity coupling circuit is inserted between the ground wire and ground of second grounding switch, resaistance-capacity coupling circuit absorbs the induced voltage that second bus produces.

Above-mentioned resaistance-capacity coupling circuit comprises resistance, switch and electric capacity, is parallel to described electric capacity two ends after described resistance and the switch series connection, and described electric capacity one end connects the ground wire of second grounding switch, its other end ground connection.

Because the online test method of SF6 breaker mechanic property of the present invention has adopted technique scheme, namely in the SF6 isolating switch double-bus method of operation, the grounding switch of pile crown under the closed SF6 isolating switch, make pile crown three-phase contact ground connection in parallel under the isolating switch, the disconnector of pile crown is connected the power failure bus on the closed SF6 isolating switch, the grounding switch of closed power failure bus, and remove being connected of grounding switch ground wire and ground, the testing mechanical characteristic instrument is inserted between grounding switch ground wire and the ground, and one group of resaistance-capacity coupling circuit inserts between three phase and ground of power failure bus; Utilize this method can implement the SF6 breaker mechanic property at thread test, guaranteed the normal operation of high pressure power supply-distribution system, and in process of the test, avoided human injury and testing equipment scaling loss, overcome the defective that the SF6 isolating switch can only off-line testing.

Description of drawings

The present invention is described in further detail below in conjunction with drawings and embodiments:

Fig. 1 is the primary circuit wiring schematic diagram of SF6 isolating switch in the double-bus method of operation,

Fig. 2 is SF6 isolating switch double-bus method of operation mechanical characteristic test wiring diagram of the present invention.

Embodiment

As shown in Figure 2, the online test method of SF6 breaker mechanic property of the present invention, SF6 isolating switch 1 is by the first disconnector DS _AWith the second disconnector DS _BConnect first bus 2 and second bus, 3, the first buses 2 and second bus 3 respectively respectively by the first grounding switch ES _A, ground wire 4 and the second grounding switch ES _B, ground wire 5 ground connection, the output terminal of SF6 isolating switch 1 is by the 3rd grounding switch ES ground connection, 2 operations of first bus, second bus 3 has a power failure; This method comprises the steps:

Step 1, with the 3rd grounding switch ES closure, this moment SF6 isolating switch 1 with respect to pile crown under one group of three-phase contact of second bus 3 in parallel and ground connection, the closed second disconnector DS _B, connect second bus 3 and the last pile crown of SF6 isolating switch 1 with respect to one group of three-phase contact of second bus 3;

Step 2, with the second grounding switch ES _BClosure is removed the second grounding switch ES simultaneously _BBeing connected of ground wire 5 and ground, this moment SF6 isolating switch 1 with respect to the last pile crown of one group of three-phase contact of second bus 3 respectively with the second grounding switch ES _BGround wire 5 be communicated with;

Step 3, testing mechanical characteristic instrument 6 is inserted the second grounding switch ES _BGround wire 5 and ground between, ground wire 5, the second grounding switch ES of testing mechanical characteristic instrument 6 this moment by second grounding switch _B, second bus 3, the second disconnector DS _B, SF6 isolating switch 1 with respect to the last pile crown of one group of three-phase contact of second bus 3, SF6 isolating switch 1 with respect to constituting the loop between the following pile crown of one group of three-phase contact of second bus 3 and the ground;

Step 4, one group of resaistance-capacity coupling circuit 7 is inserted the second grounding switch ES _BGround wire 5 and ground between, resaistance-capacity coupling circuit 7 absorbs the induced voltage that second bus 3 produces.

Above-mentioned resaistance-capacity coupling circuit 7 comprises resistance R, K switch and capacitor C, is parallel to described capacitor C two ends after described resistance R and the K switch series connection, and described capacitor C one end connects the second grounding switch ES _BGround wire 5, its other end ground connection.

By the change of above-mentioned each switch and wiring, make first bus normally supply distribution through the SF6 isolating switch, and with respect to can implementing mechanical characteristic test in each contact of the SF6 isolating switch of second bus that has a power failure, thereby guaranteed the normal operation of power supply-distribution system; During test, ground wire to the testing mechanical characteristic instrument that the test signal of SF6 isolating switch has been removed ground connection by the 3rd grounding switch, second disconnector, second bus, second grounding switch, constitutes the loop, the testing mechanical characteristic instrument can be tested every mechanical property of SF6 isolating switch, overcome totally-enclosed isolating switch when online test signal can't insert the defective of tester; Adopt resaistance-capacity coupling circuit to insert between second bus and the ground simultaneously, absorb the induced voltage on second bus, avoided jeopardizing owing to the existence of induced voltage in the test process safety of the person and equipment; According to above-mentioned principle, also can under the situation that first bus has a power failure, second bus moves, implement the mechanical characteristic test of isolating switch.

This method is implemented the mechanical characteristic test of isolating switch under the prerequisite that guarantees the normal operation of power supply-distribution system, both guaranteed normally carrying out of production, also there has been correct evaluation while to the characteristic of isolating switch, and can in time correctly grasp SF6 isolating switch running status, it has great economic implications and safe meaning.

Claims

1. online test method of SF6 breaker mechanic property, the SF6 isolating switch is connected first bus and second bus respectively by first disconnector and second disconnector, first bus and second bus are respectively by first grounding switch, ground wire and second grounding switch, ground connection, the output terminal of SF6 isolating switch is by the 3rd grounding switch ground connection, the operation of first bus, second bus has a power failure; It is characterized in that this method comprises the steps:

2. the online test method of SF6 breaker mechanic property according to claim 1, it is characterized in that: described resaistance-capacity coupling circuit comprises resistance, switch and electric capacity, be parallel to described electric capacity two ends after described resistance and the switch series connection, described electric capacity one end connects the ground wire of second grounding switch, its other end ground connection.