CN103683176A

CN103683176A - Automatic reclosing lock device of intelligent circuit breaker

Info

Publication number: CN103683176A
Application number: CN201310650484.XA
Authority: CN
Inventors: 李荣荣; 赵鸿鹏; 梁海涛
Original assignee: XUYI POWER SUPPLY Co OF JIANGSU ELECTRIC POWER Co; State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd
Current assignee: XUYI POWER SUPPLY Co OF JIANGSU ELECTRIC POWER Co; State Grid Corp of China SGCC; State Grid Jiangsu Electric Power Co Ltd
Priority date: 2013-12-06
Filing date: 2013-12-06
Publication date: 2014-03-26
Anticipated expiration: 2033-12-06
Also published as: CN103683176B

Abstract

The invention discloses an automatic reclosing device for an intelligent circuit breaker. The 220V control power source drawn from the upper pile head of the isolated knife switch is connected with a master switch (S) and a fuse (R), and the master switch (S) is connected in parallel with five branches. One branch is connected to the working indicator light (LD), the second branch is the series connection of the normally closed auxiliary contact of the circuit breaker (QF) and the delay coil of the closing delay relay (KT1), and the third branch is the closing delay The normally open contact of the time relay (KT1) is connected in parallel with the normally closed contact of the intermediate relay (KA) and then connected in series with the normally closed contact of the action delay relay (KT2) and the coil of the intermediate relay (KA). The four branches are The normally open contact of the intermediate relay (KA) is connected in series with the coil of the action delay relay (KT2), and the five branches are connected in parallel between the normally open contact of the intermediate relay (KA) and the closing button of the circuit breaker (QF). The invention realizes the automatic reclosing of the circuit breaker through the setting and cooperation of the time-delay relay, the intermediate relay and other components, the circuit is simple, the action is reliable, and the operation is stable.

Description

Intelligent breaker auto recloser

Technical field

The present invention relates to a kind of intelligent breaker reclosing device, especially by time-delay relay and auxiliary relay, meet the requirement of circuit breaker automatic reclosing after grid transmission.

Background technology

In industrial and agricultural production and people's daily life; in low-voltage power distribution room, with intelligent breaker, control switching on and off of power supply in a large number; this intelligent breaker has good protective value; collection short circuit, overload, decompression (under-voltage) are protected in one; when the situations such as power supply is short-circuited, overload, decompression (under-voltage), can cut off the electricity supply rapidly, the safety of protection electrical network and power consumption equipment.But in the middle of practice, often there is applying unit that the decompression of intelligent breaker (under-voltage) function is cancelled, its objective is at electrical network and be struck by lightning or intelligent breaker open circuit not power supply department has a power failure in the situation that, and when power system restoration is powered, do not need manually to remove operative intelligence circuit breaker and restore electricity rapidly and reduce repair and maintenance personnel's workload.There is a problem in this way: when electrical network is subject to being struck by lightning, owing to not having decompression (under-voltage) defencive function may cause being struck by lightning and being damaged by the large area of the electric equipment in this intelligent breaker supply district.

summary of the invention

The object of the invention is to: intelligent breaker reclosing device is provided; if intelligent breaker needs artificial power transmission and removes decompression (under-voltage) coil to cause electric equipment in circuit breaker supply district to suffer the deficiencies such as broken by lightning after overcoming grid transmission; this device can not only keep the original all kinds of defencive functions of intelligent breaker normally to work; and can after grid transmission, automatically drop into intelligent breaker, reduce the maintenance cost that artificial power transmission is brought.

The technical solution adopted for the present invention to solve the technical problems is: this circuit breaker reclosing device comprises master switch, fuse, relay indicating light, circuit breaker, combined floodgate time-delay relay, action delay relay and auxiliary relay, circuit connects as follows: the upper pile crown Yin Yi road 220V of isolation switch controls power supply, on power supply major loop, connect master switch and secondary circuit protection fuse, five road branch roads in parallel on master switch, one branch road connects relay indicating light, two branch roads are the normally closed auxiliary contact of circuit breaker and connecting of combined floodgate time-delay relay time delay coil, three branch roads are that the normally opened contact of combined floodgate time-delay relay and the normally-closed contact of auxiliary relay are composed in series the latching circuit of an auxiliary relay with the normally-closed contact of action delay relay and the coil of auxiliary relay after in parallel, four branch roads are connecting of the normally opened contact of auxiliary relay and the coil of action delay relay, five branch roads are that the normally opened contact of auxiliary relay and the switch knob of circuit breaker are in parallel.

Wherein, combined floodgate time-delay relay time delay 20S, action delay relay time delay 2S, fuse is got 5A.

The present invention coordinates by time-delay relay and auxiliary relay, after circuit power transmission, time delay 20S waits for after line voltage tends towards stability and moves breaker closing is devoted oneself to work, recycling time-delay relay time delay 2S is to guarantee that reclosing moves successfully, and the state that whole device is returned to before incoming call waits for next time automatic reclosing action, by adjusting of the elements such as time-delay relay, auxiliary relay, coordinate and reached circuit breaker automatic reclosing, circuit is simple, reliable in action, stable.

Accompanying drawing explanation

Fig. 1 is intelligent breaker auto recloser circuit theory diagrams.

In figure: S master switch, R fuse, LD relay indicating light, QF circuit breaker, KT1 combined floodgate time-delay relay, KT2 action delay relay, KA auxiliary relay.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail.

As shown in Figure 1, this circuit breaker reclosing device comprises master switch S, fuse R, relay indicating light LD, circuit breaker Q F, combined floodgate time-delay relay KT1, action delay relay K T2 and auxiliary relay KA, its circuit connects as follows: the upper pile crown Yin Yi road 220V of isolation switch controls power supply, on power supply major loop, connect master switch S and secondary circuit protection fuse R, the upper five road branch roads in parallel of master switch S, one branch road connects relay indicating light LD, two branch roads are the normally closed auxiliary contact of circuit breaker Q F and connecting of combined floodgate time-delay relay KT1 time delay coil, three branch roads are that the normally opened contact of combined floodgate time-delay relay KT1 and the normally-closed contact of auxiliary relay KA are composed in series the latching circuit of an auxiliary relay KA with the normally-closed contact of action delay relay K T2 and the coil of auxiliary relay KA after in parallel, four branch roads are connecting of the normally opened contact of auxiliary relay KA and the coil of action delay relay K T2, five branch roads are that the normally opened contact of auxiliary relay KA is in parallel with the switch knob of circuit breaker Q F.

Wherein, combined floodgate time-delay relay KT1 time delay 20S, action delay relay K T2 time delay 2S, fuse R gets 5A.

The master switch S that closes, after grid transmission, relay indicating light LD is bright, represents that this device comes into operation; When circuit power transmission, circuit breaker Q F is at open position, and its normally closed auxiliary contact is in on-state, combined floodgate time-delay relay KT1 coil electricity, after 20S time delay, line voltage tends towards stability, combined floodgate time-delay relay KT1 normally opened contact is closed, now action delay relay K T2 does not switch on, therefore its normally-closed contact is connected, auxiliary relay KA coil obtains electric, its normally opened contact is all closed, the switch knob two ends of circuit breaker Q F are connected, and its closing coil obtains electric, breaker closing; Simultaneously, auxiliary relay KA self-locking, action delay relay K T2 coil obtains electric, time delay 2S switch knob turn-on time during in order to simulating hand power transmission, after 2S, action delay relay K T2 normally-closed contact disconnects, auxiliary relay KA coil losing electricity, and its normally opened contact all disconnects, circuit returns to again the not state of power transmission of electrical network, prepares automatic reclosing action next time.

Claims

1. Intelligent circuit breaker automatic reclosing device, characterized in that: the circuit breaker reclosing device includes a master switch (S), a fuse (R), a working indicator light (LD), a circuit breaker (QF), a closing delay Time relay (KT1), action delay relay (KT2) and intermediate relay (KA), the circuit connections are as follows: the upper pile head of the isolation knife switch leads to a 220V control power supply, and the main circuit of the power supply is connected to the master switch (S) and The secondary circuit protection fuse (R), the master switch (S) is connected in parallel with five branches, one branch is connected to the working indicator light (LD), and the second branch is the normally closed auxiliary contact of the circuit breaker (QF) and The closing delay relay (KT1) delay coil is connected in series, and the three branches are the normally open contacts of the closing delay relay (KT1) and the normally closed contacts of the intermediate relay (KA) connected in parallel with the action delay relay ( The normally closed contact of KT2) and the coil of the intermediate relay (KA) are connected in series to form a self-locking circuit of the intermediate relay (KA), and the four branches are the normally open contacts of the intermediate relay (KA) and the action delay relay (KT2) The coils are connected in series, and the five branches are connected in parallel with the normally open contacts of the intermediate relay (KA) and the closing button of the circuit breaker (QF).

2. The intelligent circuit breaker automatic reclosing device according to claim 1, characterized in that: the closing delay relay (KT1) delays 20S, the action delay relay (KT2) delays 2S, and the fuse (R) takes 5A.