CN205335162U - Decompression circuit board that general type is under -voltage - Google Patents

Abstract

The utility model relates to a decompression circuit board that general type is under -voltage belongs to the under -voltage under -voltage protection circuit field of vacuum circuit breaker. Including under -voltage no -voltage release, latching electromagnet, micro -gap switch, electric capacity, resistance, the first line is constituteed with capacitance parallel connection after establishing ties with supplementary close point of micro -gap switch and circuit breaker auxiliary point to under -voltage no -voltage release, latching electromagnet and series resistance constitute the second line, the first line and the second line are parallelly connected. Compared with the prior art the utility model provides a be applicable to the under -voltage decompression circuit board of vacuum circuit breaker, can make breaker open operation and cut off combined floodgate return circuit power automatically under the state of under -voltage decompression. Electronic component is few simultaneously, control circuit simplification, and the pleasing to the eye usability of overall arrangement is strong, does not have any special requirement to outside control circuit and design.

Description

A general-purpose circuit board for undervoltage and voltage loss

technical field

The utility model belongs to the field of under-voltage and loss-of-voltage protection circuits of vacuum circuit breakers, in particular to a general-purpose under-voltage and loss-of-voltage circuit board suitable for vacuum circuit breakers.

Background technique

A relay is an electrical control device. It has the interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit), and is usually used in the automatic control circuit. It is actually a kind of control of large current operation with small current "automatic switch". Therefore, the relay plays the role of automatic adjustment, safety protection and conversion circuit in the circuit.

Because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are high vacuum, the vacuum relay is widely used in the distribution network because of its advantages of small size, light weight, suitable for frequent operation, and no maintenance for arc extinguishing.

Since the vacuum circuit breaker cannot automatically trip under the condition of low voltage and loss of voltage, it will have the following effects on the load electrical or electrical equipment below the circuit breaker: the operation of the equipment under the condition of low voltage will cause damage to the equipment, and the moment the voltage recovers will be For the impact voltage of secondary electrical components, since the vacuum circuit breaker remains closed under the state of undervoltage and loss of voltage, when the working voltage is restored, on the one hand, due to operating overvoltage and impact, etc., the instantaneous voltage quality will be deteriorated. Serious threat or even damage to the load below the circuit breaker; on the other hand, since all lines are kept closed, all electrical equipment under the load will start at the same time, and the starting current is very large, which will cause instantaneous overload of the line, which is extremely harmful to safe operation unfavorable.

In view of the deficiencies in the prior art, this technical field urgently needs a new technical solution to solve the problems in the prior art.

Contents of the invention

The technical problem to be solved by the utility model: aiming at the deficiencies and defects of the prior art, the utility model provides a safe, reliable and usable general-purpose undervoltage and voltage-loss circuit board.

A general-purpose undervoltage and loss of voltage circuit board is characterized in that it includes an undervoltage and loss of voltage release, a locking electromagnet, a micro switch, a capacitor, a resistor,

The under-voltage and loss-of-voltage release is connected in series with the auxiliary closing point of the microswitch and the auxiliary opening point of the circuit breaker, and then connected in parallel with a capacitor to form a first line;

The locking electromagnet is connected in series with a resistor to form a second circuit;

The first line is connected in parallel with the second line.

A push rod is arranged on the locking electromagnet.

Through the above design scheme, the utility model can bring the following beneficial effects: provide a circuit board suitable for vacuum circuit breaker undervoltage and loss of voltage, which can automatically open the circuit breaker and cut off the closing circuit in the state of undervoltage and loss of voltage power supply. At the same time, there are few electronic components, the control circuit is simplified, the layout is beautiful and the usability is strong, and there is no special requirement for the external control circuit and design scheme.

Description of drawings

The utility model will be further described below in conjunction with description of drawings and specific embodiments:

Fig. 1 is a circuit diagram on a general-purpose undervoltage and voltage-loss circuit board of the present invention.

In the figure: Y4-undervoltage and loss of voltage release, Y2-locking electromagnet, S2-micro switch, C-capacitor, R-resistor, QF-circuit breaker auxiliary point.

detailed description

As shown in Figure 1, a general-purpose undervoltage and loss of voltage circuit board is characterized by: including an undervoltage and loss of voltage release Y4, a locking electromagnet Y2, a micro switch S2, a capacitor C, and a resistor R.

The under-voltage and loss-of-voltage release Y4 is connected in series with the auxiliary point of the microswitch S2 and the auxiliary point of the circuit breaker QF, and then connected in parallel with the capacitor C to form the first line;

The locking electromagnet Y2 is connected in series with the resistor R to form a second circuit, and the resistor R plays a role in protecting the circuit;

The first line is connected in parallel with the second line.

The locking electromagnet Y2 is provided with a push rod.

When a general-purpose undervoltage and pressure-loss circuit board of the utility model is used, when the circuit breaker is not closed, the auxiliary point QF of the circuit breaker is a normally open contact; after the circuit breaker is normally closed, the auxiliary point QF of the circuit breaker in the circuit becomes When the actual voltage is above 85% of the rated voltage, the locking electromagnet Y2 will be activated, and the push rod of the locking electromagnet Y2 will hit the micro switch S2, so that the auxiliary closing of the micro switch S2 connected in series in the circuit will be closed. The point disconnection becomes the open point, and the Y4 circuit of the undervoltage and loss of voltage release is disconnected due to the disconnection of the contact of the microswitch S2. At this time, the undervoltage and loss of voltage release Y4 cannot be powered, but at this time the capacitor C is charged; when the actual When the voltage is 30% of the rated voltage, the locking electromagnet Y2 loses power, the ejector pin of the locking electromagnet Y2 returns to its original position, and cannot touch the micro switch S2, and the contact of the micro switch S2 returns to the closed state, at this time the undervoltage The Y4 circuit of the voltage-loss release is connected and energized, and at the same time, the capacitor C is discharged, so that the under-voltage and voltage-loss release Y4 trips, and the circuit breaker is opened.

When the voltage of the undervoltage and loss of voltage circuit of the utility model does not return to the normal value, the closing circuit is always disconnected, thereby fundamentally avoiding damage to devices in the circuit when the vacuum relay occurs undervoltage and loss of voltage. At the same time, there are few electronic components, the control circuit is simplified, the layout is beautiful and the usability is strong, and there is no special requirement for the external control circuit and design scheme.

Claims (2)

1. a universal under-voltage decompression wiring board, is characterized in that: include under-voltage no-voltage release (Y4), latching electromagnet (Y2), microswitch (S2), electric capacity (C), resistance (R),

First line is composed in parallel with electric capacity (C) after described under-voltage no-voltage release (Y4) assists close point with microswitch (S2) and chopper auxiliary magnet (QF) is connected；

Described latching electromagnet (Y2) and resistance (R) are composed in series the second circuit；

Described first line and the second lines in parallel。

2. the universal under-voltage decompression wiring board of one according to claim 1, is characterized in that: be provided with push rod on described latching electromagnet (Y2)。