CN202678947U

CN202678947U - Improved switch control 'two-out-of-three' locking loop

Info

Publication number: CN202678947U
Application number: CN 201220206255
Authority: CN
Inventors: 李锋涛; 崔琪; 何颖; 鹿鹏; 陈德超; 李华峰
Original assignee: XI'AN POWER SUPPLY BUREAU; State Grid Corp of China SGCC
Current assignee: XI'AN POWER SUPPLY BUREAU; State Grid Corp of China SGCC
Priority date: 2012-05-09
Filing date: 2012-05-09
Publication date: 2013-01-16
Anticipated expiration: 2022-05-09

Abstract

The utility model relates to an improved switch control 'two-out-of-three' locking loop. The improved switch control 'two-out-of-three' locking loop is characterized in that: a pressure plate 1LP4 is then incorporated into a parallel loop of 2DL and 3DL. A pair of protection device output blank nodes are then incorporated into a parallel loop of the 2DL, the 3DL, and the 1LP4. A remote unlocking loop is added in a control loop. When the manual operation is performed, an operator safely, quickly and manually disables the switch control 'two-out-of-three' locking function in situ. When the remote control operation is performed, a remote control operator safely, quickly and remotely disables the switch control 'two-out-of-three' locking function; the hidden trouble due to changing the operation way is reduced, the power supply reliability is improved, the level of best service is improved, and the operation time for changing the operation way is greatly shortened.

Description

A kind of modified model switch control " three get two " locked loop

Technical field

The utility model belongs to relaying protection field in the power engineering, relates to a kind of device of secondary circuit wiring technique, especially a kind of modified model switch control " three get two " locked loop.

Background technology

Under special operational mode or switching station when handing in hand series-fed, switch control " three get two " locking so that the 3rd switch can not close a floodgate during in "on" position at the first two switch, necessarily require to overhaul on-the-spot " three the get two " locked loop of removing of teams and groups, with so that the operating time of change operational mode increases greatly, increased simultaneously the potential safety hazard that changes in the operational mode work.

The utility model content

The purpose of this utility model is to overcome the shortcoming of above-mentioned prior art, a kind of modified model switch control " three get two " locked loop is provided, this locked loop is by the improvement on prior art, can realize reliable switch control " three get two " blocking function, when the special operational mode of system and switching station are handed in hand series-fed, can realize the switch control three quick releasings of getting two blocking functions, and recovery switch that can be quick, safe after operation is finished control " three get two " blocking function.

The purpose of this utility model solves by the following technical programs:

This modified model switch control " three get two " locked loop is to incorporate a pressing plate 1LP4 in 2DL, 3DL shunt circuit into again.

Further, in the shunt circuit of above-mentioned 2DL, 3DL, 1LP4, incorporate again a pair of protective device into and export empty node.

Further, in the control loop of " three get two " locked loop, increase the remote controlled unlocking loop.

Modified model switch control " three get two " locked loop of the present utility model has improved power supply reliability, has promoted the good service level; Shortened greatly the operating time that changes operational mode.

Description of drawings

Fig. 1 is presser type switch control circuit figure of the present utility model;

Fig. 2 is the switch control circuit figure that has increased empty node;

Fig. 3 is the switch control circuit figure that has increased the remote controlled unlocking loop;

Fig. 4 is the duplicate supply switching station wiring schematic diagram of sectionalized single busbar connection;

Fig. 5 is the duplicate supply switching station wiring schematic diagram of sectionalized single busbar connection.

Embodiment

Below in conjunction with accompanying drawing the utility model is done and to be described in further detail:

Fig. 4 is the duplicate supply switching station wiring schematic diagram of sectionalized single busbar connection, the female operation of the band switching station I of A transformer station, the female operation of the band switching station II of B transformer station, bus connection switch cold standby.Two incoming powers, the one tunnel is transformer station's special line, the duplicate supply switching station that another road power supply is the switching station interconnection: the bus connection switch operation, transformer station's special line is main power supply; Interconnection (public network inlet wire) is stand-by power supply.Fig. 5 is the duplicate supply switching station wiring schematic diagram of sectionalized single busbar connection, line mode explanation: the female operation of A transformer station band C switching station (mother combined floodgate) I, II, the female operation of B transformer station band D switching station (mother combined floodgate) I, II, the interconnection between switching station C, D is as the stand-by power supply of two switching stations.Respectively the normally closed node parallel connection of auxiliary switch any two in 1# inlet wire, 2# inlet wire, the bus is accessed afterwards the closing circuit of another one circuit breaker, like this when any two circuit breakers are in "on" position, the another one closing circuit of circuit breaker is obstructed, thereby realizes the electric blocking of " three get two ".

Three get two " locking principle explanation (take the 1# inlet wire as example, other in like manner):

In the closing circuit of 1# lead-in circuit breaker, seal in the normally closed contact (2DL) of 2# auxiliary switch for circuit breaker and the normally closed contact (3DL) of bus auxiliary switch, when the 2# Ncoming and coupling breaker is in "on" position, 2DL, 3DL open simultaneously, 1# lead-in circuit breaker closing circuit disconnects, and realizes switch control circuit " three get two " blocking function.

The utility model carries out following improvement on the basis of existing " three get two " locked loop to be realized:

As shown in Figure 1, incorporate again a pressing plate 1(1LP4 in 2DL, the 3DL shunt circuit into), under the normal condition, pressing plate 1 is opened, and switch control " three get two " blocking function is normal; When needs are removed " three get two " locked loop, drop into pressing plate 1, then switch closing circuit conducting has realized withdrawing from fast of " three get two " blocking function.

As shown in Figure 2, incorporating a pair of protective device in 2DL, 3DL, 1LP4 shunt circuit exports empty node 2(and often opens again).Under the normal condition, protective device is exported empty node 2 and is opened, and switch control " three get two " blocking function is normal; When straighforward operation needed to remove " three get two " locked loop, first distance protection device was exported empty node 2 closures, and then switch closing circuit conducting has realized withdrawing from fast of " three get two " blocking function.

As shown in Figure 3, in control loop, increase remote controlled unlocking loop 3, i.e. intermediate relay ZJ node in parallel again in 2DL, 3DL, 1LP4 shunt circuit, intermediate relay ZJ is the part in remote controlled unlocking loop 3, drive intermediate relay ZJ by remote controlled unlocking loop 3, then be attempted by intermediate relay ZJ node closure in 2DL, the 3DL shunt circuit, then switch closing circuit conducting has realized withdrawing from fast of " three get two " blocking function.After switch closes a floodgate, the auxiliary switch for circuit breaker joint deformation, the ZJ loop disconnects, and " three get two " blocking function drops into automatically.

Claims

1. modified model switch control " three get two " locked loop is characterized in that: incorporate a pressing plate 1LP4 in 2DL, 3DL shunt circuit again; Described 2DL is the normally closed contact of 2# auxiliary switch for circuit breaker, and 3DL is the normally closed contact of bus auxiliary switch.

2. modified model switch control " three get two " locked loop according to claim 1 is characterized in that: incorporate a pair of protective device into again and export empty node in the shunt circuit of 2DL, 3DL, 1LP4.

3. modified model switch control " three get two " locked loop according to claim 1 is characterized in that: increase the remote controlled unlocking loop in control loop.