CN2296083Y

CN2296083Y - High-voltage line short-circuit fault property judging and protecting device

Info

Publication number: CN2296083Y
Application number: CN 97215818
Authority: CN
Inventors: 秦文波
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-28
Filing date: 1997-05-28
Publication date: 1998-10-28
Anticipated expiration: 2007-05-28

Abstract

A high-voltage line short-circuit fault property judging and protecting device is characterized in that an isolating switch GK1, a fuse RD, an impedance current limiter XL, a load switch DL1 and an isolating switch GK2 which are mutually connected in series are connected in parallel with a high-voltage circuit breaker DL of an original line, a voltage transformer YH is connected between the current limiter XL and the load switch DL1, and a secondary control circuit of the device comprises a load switch delay starting circuit, a closing and automatic resetting starting circuit, a fault judging signal circuit, a load switch opening, closing and position signal circuit, a fault detection circuit, a reclosing lock, a permanent fault circuit and the like. The utility model discloses can judge the nature of line fault rapidly, accurately, can prolong the life of equipment, reduce the malfunction of operation, improve the running quality of whole electric wire netting.

Description

High-tension line short trouble character is judged protective device

The utility model relates to a kind of protective device of high-tension line, and especially a kind of high-tension line short trouble character is judged protective device.

Permanent or provisional short trouble owing to underground, environment, weather, operating position are responsible for factors such as changeable, often takes place in ultra-high-tension power transmission line.Whether and at present with in the transmission line that puts into operation in a large number, after fixing the generation, generally at first automatic reclosing once when reclosing gets nowhere, needs to force trial line charging once more or repeatedly, be used for observation and failure judgement and exist.Like this, not only often make operating personnel in a rush, more development is to make many equipment of whole high-tension line system repeatedly be subjected to the impact of powerful short circuit current, and its current value can surpass tens times of rated current, even hundred times.And when heavy current disconnects, dare to go out extra-high pressure again, serious harm is to the device security of whole transmission system, and increasing of fault frequency thereupon, and the class of insulation of equipment and electric property also progressively reduce, and have shortened the useful life of equipment greatly.

The purpose of this utility model is exactly to provide a kind of high-tension line short trouble character to judge protective device at the deficiency of prior art, it can judge the character of line fault rapidly, exactly, and to provisional short trouble, send the automatic reclosing instruction immediately, make the rapid normal operation input of system; To permanent fault, the instruction of then send the maintenance circuit, fixing a breakdown, and make the automatic reclosing failure mechanisms, make equipment exempt from repeatedly big electric current and superpotential impact.

The purpose of this utility model is achieved in that a kind of high-tension line short trouble character judgement protective device, and it is made up of major loop and corresponding secondary control loop.Its major loop is attempted by on the primary cut-out DL of former circuit by isolating switch GK1, flow restricter XL, on-load switch DL1, the isolating switch GK2 of mutual series connection, and voltage transformer YH forms in the middle of being connected on flow restricter XL and on-load switch DL1; The secondary control circuit comprises that the contact that connects fault inspection hydraulic circuit that voltage relay forms, voltage relay by voltage transformer output is connected in series into fault judgement signal circuit and on-load switch delayed firing loop, on-load switch closes a floodgate and automatic involution start loop, on-load switch sub-gate circuit, signal return, fuse supervision, on-load switch separating brake position signalling and on-load switch closing position signal circuit, reclosing block, on-load switch closing circuit, permanent fault loop.

Described flow restricter XL is the impedance type flow restricter.

Be connected to current transformer LH between described on-load switch DL1 and the voltage transformer YH.

Meet fuse RD between described isolating switch GK1 and the flow restricter XL.

According to the technique scheme analysis as can be known, the utility model is before the high-tension line fault takes place, separate with job network, normal operation is had no effect to job network, drops into network immediately after breaking down, and carry out Non-Destructive Testing under the little electric current operating mode of high voltage, it guarantees safe and reliable to operation, reduce the misoperation of operation the useful life of prolongation equipment, improves the running quality of whole electrical network.

Below in conjunction with accompanying drawing and specific embodiments the utility model is described in further detail.

Fig. 1 is a formation block diagram of the present utility model;

Fig. 2 is a high-pressure side of the present utility model circuit interconnect pattern;

Fig. 3 is one of secondary side circuit theory diagrams of the present utility model;

Fig. 4 is two of secondary side circuit theory diagrams of the present utility model.

Referring to Fig. 1,2,3,4; the utility model is that a kind of high-tension line short trouble character is judged protective device; its isolating switch GK1 that connects mutually, flow restricter XL, on-load switch DL1, isolating switch GK2 are attempted by on the primary cut-out DL of former circuit, and voltage transformer YH is connected in the middle of flow restricter XL and the on-load switch DL1.Its fault inspection hydraulic circuit meets voltage relay YJ by voltage transformer YH output and forms, when permanent fault takes place, when voltage is higher than certain value, voltage relay YJ gets, the normally closed contact YJ1 of voltage relay YJ is connected in series the loop into the auxiliary relay GPJ of fault judgement signal, the normal opened contact GPJ1 of GPJ connects the permanent fault display circuit, and its normally closed contact GPJ2 makes the automatic reclosing locking, thereby makes on-load switch DL1 can't carry out automatic reclosing; When provisional fault takes place, when voltage is lower than certain value, voltage relay YJ must not, therefore be connected in series must not into the auxiliary relay GPJ of fault judgement signal for normally closed contact YJ1, its normally closed contact GPJ2 connects the automatic reclosing circuit, on-load switch DL1 can finish automatic reclosing under the control of control circuit, GPJ1 disconnects the permanent fault display circuit simultaneously.

And its secondary control circuit also comprises subsidiary loops such as on-load switch delayed firing loop, on-load switch combined floodgate and automatic involution start loop, on-load switch sub-gate circuit, signal return, fuse supervision, on-load switch separating brake position signalling and on-load switch closing position signal circuit, reclosing block, on-load switch closing circuit, on-load switch mechanism heats.The contact of on-load switch DL in the major loop is serially connected in the control circuit, and 1SJ gets electric, and self-sustaining a period of time, and during the WK separating brake, same 1SJ gets electric, and self-sustaining a period of time; It is electric that the contact 1SJ1 of 1SJ gets 2SJ, and the contact 1SJ3 of 1SJ makes HJ delay time electricly, finishes the making process of on-load switch DL1, and its auxiliary contact DL7 connects the combined floodgate indicator light; 2SJ gets electric, delays time after the time, and FGJ gets electric, cuts off the 1SJ loop, the 1SJ dead electricity; During the separating brake of on-load switch DL1, it is electric that auxiliary contact DL3 gets 3SJ, and it is electric through time-delay tripping relay TJ to be got, and it is electric through the auxiliary contact DL4 of on-load switch DL1 switching winding FQ to be got, on-load switch DL1 separating brake, and its auxiliary contact DL6 connects the separating brake indicator light simultaneously.

Because have bigger influence the detection time of the time of delay of inductance type and capacitive flow restricter to fault, so the utility model adopts impedance type flow restricter XL, and it has high-power, high temperature resistant and electric current does not have lag or lead to voltage characteristic.

Be connected in series current transformer LH between on-load switch DL1 and the voltage transformer YH and can be the function that the utility model provides fault distance to measure.

Be connected in series the reserve fuse protection measure that fuse RD can be used as on-load switch DL1 between isolating switch GK1 and the flow restricter XL.Relay R JJ in the control circuit is the supervisory relay of fuse RD, when fuse blows, and the RJJ dead electricity, its contact sends power-off signal.

Claims

1, a kind of high-tension line short trouble character is judged protective device, it is made up of major loop and corresponding secondary control loop, it is characterized in that: its major loop is attempted by on the primary cut-out DL of former circuit by isolating switch GK1, flow restricter XL, on-load switch DL1, the isolating switch GK2 of mutual series connection, and voltage transformer YH forms in the middle of being connected on flow restricter XL and on-load switch DL1; The secondary control circuit comprises that the contact that connects fault inspection hydraulic circuit that voltage relay forms, voltage relay by voltage transformer output is connected in series into fault judgement signal circuit and on-load switch delayed firing loop, on-load switch closes a floodgate and automatic involution start loop, on-load switch sub-gate circuit, signal return, fuse supervision, on-load switch separating brake position signalling and on-load switch closing position signal circuit, reclosing block, on-load switch closing circuit, permanent fault loop.

2, high-tension line short trouble character according to claim 1 is judged protective device, and it is characterized in that: described flow restricter XL is the impedance type flow restricter.

3, high-tension line short trouble character according to claim 1 is judged protective device, it is characterized in that: be connected to current transformer LH between described on-load switch DL1 and the voltage transformer YH.

4, high-tension line short trouble character according to claim 1 is judged protective device, it is characterized in that: meet fuse RD between described isolating switch GK1 and the flow restricter XL.