CN103683176B - Intelligent breaker auto recloser - Google Patents

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 circuit breaker automatic reclosing device

technical field

The invention relates to an intelligent circuit breaker reclosing device, in particular to meet the requirements of automatic reclosing of the circuit breaker after power transmission through a power grid through a delay relay and an intermediate relay.

Background technique

In industrial and agricultural production and people's daily life, a large number of smart circuit breakers are used in low-voltage power distribution rooms to control the power on and off. ) protection in one, when the power supply has short circuit, overload, voltage loss (undervoltage), etc., it can quickly cut off the power supply to protect the safety of the power grid and electrical equipment. However, in practice, there are often users who cancel the loss of voltage (undervoltage) function of the smart circuit breaker. There is no need to manually operate the smart circuit breaker to quickly restore power supply and reduce the workload of maintenance personnel. There is a problem in this approach: when the power grid is struck by lightning, a large area of electrical equipment within the power supply range of the smart circuit breaker may be damaged by lightning strikes due to the absence of a voltage loss (undervoltage) protection function.

Contents of the invention

The purpose of the present invention is to provide a reclosing device for an intelligent circuit breaker, which overcomes the shortcomings that the intelligent circuit breaker needs manual power transmission after power transmission from the power grid and that electrical equipment within the power supply range of the circuit breaker may be damaged by lightning if the coil is removed. , the device can not only maintain the normal operation of the original various protection functions of the smart circuit breaker, but also automatically switch on the smart circuit breaker after the grid is powered on, reducing maintenance costs caused by manual power transmission.

The technical solution adopted by the present invention to solve the technical problem is: the circuit breaker reclosing device includes a master switch, a fuse, a working indicator light, a circuit breaker, a closing delay relay, an action delay relay and an intermediate relay, and the circuit is connected As follows: the upper pile head of the isolation knife switch leads to a 220V control power supply, the main circuit of the power supply is connected to the master switch and the secondary circuit protection fuse, the master switch is connected in parallel to five branches, one branch is connected to the working indicator light, and the second The branch circuit is the series connection of the normally closed auxiliary contact of the circuit breaker and the delay coil of the closing delay relay. The normally closed contact of the time relay and the coil of the intermediate relay are connected in series to form a self-locking circuit of the intermediate relay. The four branches are the series connection of the normally open contact of the intermediate relay and the coil of the action delay relay. The normally open contact is connected in parallel with the closing button of the circuit breaker.

Among them, the closing delay relay delays 20S, the action delay relay delays 2S, and the fuse takes 5A.

In the present invention, through the cooperation of the delay relay and the intermediate relay, after the line is powered, the circuit breaker is closed and put into operation after a delay of 20S until the grid voltage tends to be stable, and then the delay relay is used to delay 2S to ensure the reclosing action Success, and restore the whole device to the state before the incoming call and wait for the next automatic reclosing action. The setting and coordination of the delay relay, intermediate relay and other components achieve the automatic reclosing of the circuit breaker. The circuit is simple, the action is reliable, and the operation is stable.

Description of drawings

Figure 1 is a circuit schematic diagram of an automatic reclosing device for an intelligent circuit breaker.

In the figure: S master switch, R fuse, LD work indicator light, QF circuit breaker, KT1 closing delay relay, KT2 action delay relay, KA intermediate relay.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, 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 relay KT1, an action delay relay KT2 and an intermediate relay KA. The connection is as follows: the upper pile head of the isolation knife switch leads to a 220V control power supply, 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 to five branch circuits, and one branch is connected to work The 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 normally open contact of the closing delay relay KT1 and the intermediate relay KA After the normally closed contacts are connected in parallel with the normally closed contacts of the action delay relay KT2 and the coil of the intermediate relay KA in series to form a self-locking circuit of the intermediate relay KA, the four branches are the normally open contacts of the intermediate relay KA and the action delay The coils of the relay KT2 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.

Among them, the closing delay relay KT1 delays 20S, the action delay relay KT2 delays 2S, and the fuse R takes 5A.

Close the master switch S, when the grid is powered, the working indicator LD is on, indicating that the device is put into use; when the line is powered, the circuit breaker QF is in the off position, and its normally closed auxiliary contact is in the on state, The coil of the closing delay relay KT1 is energized. After a 20S delay, the grid voltage tends to be stable. The normally open contact of the closing delay relay KT1 is closed. At this time, the action delay relay KT2 is not powered, so its normally closed contact When the intermediate relay KA coil is energized, its normally open contacts are all closed, the two ends of the closing button of the circuit breaker QF are connected, its closing coil is energized, and the circuit breaker is closed; at the same time, the intermediate relay KA is self-locked and operates The coil of the delay relay KT2 is energized, and the delay of 2S is used to simulate the closing time of the closing button during manual power transmission. After 2S, the normally closed contact of the action delay relay KT2 is disconnected. The points are all disconnected, and the circuit returns to the state where the power grid is not powered, ready for the next automatic reclosing action.

Claims (2)

1. intelligent breaker auto recloser, it is characterized in that: this circuit breaker auto recloser comprises master switch (S), fuse (R), relay indicating light (LD), circuit breaker (QF), combined floodgate time-delay relay (KT1), action delay relay (KT2) and auxiliary relay (KA), its circuit connects as follows: the upper pile crown of isolation switch draws a road 220V and controls power supply, power supply major loop connects 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 (QF) and connecting of combined floodgate time-delay relay (KT1) time delay coil, three branch roads be the normally opened contact of combined floodgate time-delay relay (KT1) in parallel with the normally-closed contact of auxiliary relay (KA) after form the latching circuit of an auxiliary relay (KA) with the normally-closed contact of action delay relay (KT2) and the coils connected in series of auxiliary relay (KA), four branch roads are the normally opened contact of auxiliary relay (KA) and the connecting of the coil of action delay relay (KT2), five branch roads are that the normally opened contact of auxiliary relay (KA) is in parallel with the switch knob of circuit breaker (QF).

2. intelligent breaker auto recloser according to claim 1, is characterized in that: combined floodgate time-delay relay (KT1) time delay 20S, and action delay relay (KT2) time delay 2S, 5A got by fuse (R).