KR200178990Y1 - Auxiliary switching apparatus of high voltage circuit breaker - Google Patents

Abstract

The present invention relates to a contactless auxiliary switching device of a high-voltage circuit breaker that is electrically contactless switching function due to mechanical operation. Such a solid state auxiliary switching device receives a sub switch driving signal according to driving of trip, on, off of a high voltage circuit breaker, and provides a control signal to loads at a later stage. An auxiliary switching device of a high-voltage circuit breaker, comprising: an optical coupler that receives the auxiliary switch driving signal and performs contactless switching, and a triac providing an active level control signal to the loads when the optical coupler is turned on. It characterized by including.

Description

Auxiliary switching apparatus of high voltage circuit breaker}

The present invention relates to an auxiliary switching device of a high-voltage circuit breaker, and more particularly, to an auxiliary switching device of a high-voltage circuit breaker that is electrically contactless switching function due to mechanical operation.

The high pressure vacuum circuit breaker (VCB) used in transmission and distribution facilities is a machine protection device that quickly dissipates arcs generated in the vacuum container during the opening and closing of the normal load and the breaking of the fault current, thereby quickly separating the circuit.

The high voltage circuit breaker is composed of a main circuit part, a mechanism part, and an auxiliary device, and the main circuit part is composed of a current interruption part, an insulation part, and an arc extinguishing device.

The current interruption unit is composed of auxiliary switches, and each auxiliary switch is composed of a movable contact and a fixed contact. The movable contact is interlocked with the mechanical part of the high voltage circuit breaker and is in contact with the fixed contact when the high voltage circuit breaker is in an 'on' state. At this time, sufficient pressure is provided between the movable contact and the fixed contact, so that the current flowing through the circuit is not suppressed by the contact resistance. On the other hand, when the high-voltage circuit breaker is in the 'off' state, the movable contact is separated to a suitable breaking distance at an appropriate speed. In addition, the insulating portion is made of an epoxy mold or a BMC resin having an insulating function. The extinguishing device eliminates the arc that occurs when switching the contacts of high voltage breaker and breaking the fault current.

The auxiliary device is an accessory device for operating the high voltage circuit breaker normally, and is composed of a control device, an interlock device, a drawing device, and the like.

The mechanism part constitutes a mechanical mechanism for opening and closing the movable contact and the fixed contact of the high voltage circuit breaker. In other words, the mechanical lever of the mechanism moves, whereby the movable contact of the current interrupting portion is attached to the fixed contact or falls. The mechanical lever of the mechanism moves so that the high-voltage circuit breaker comes into contact with the movable contact and the fixed contact when it is turned on, and moves back to its original position when it is turned off or trips so that the movable contact and the fixed contact fall.

Since the flow of current provided to the load in the conventional high voltage circuit breaker is controlled by the mechanical lever, the mechanical lever may be deformed or misaligned, which often causes malfunctions. There is a problem that a serious failure occurs in high voltage transmission and distribution due to malfunction or malfunction of the switching operation.

Accordingly, an object of the present invention is to provide an auxiliary switching device of a high voltage circuit breaker, which is designed to solve the problems of the prior art as described above, and makes the switching action of a contact action by a mechanical lever electrically contactless.

1 is a block diagram of a contactless auxiliary switching device of a high-voltage circuit breaker according to an embodiment of the present invention.

※ Explanation of code about main part of drawing ※

110: high voltage circuit breaker 120: solid state auxiliary switching device

121, 123: optical coupler 122, 124: triac

125: voltage control unit

In order to achieve the above object, the non-contact auxiliary switch device of the high-voltage circuit breaker according to the present invention receives an auxiliary switch driving signal according to driving, such as trip / on / off of the high-voltage circuit breaker. An auxiliary switching device of a high voltage circuit breaker that provides a control signal to a load of a subsequent stage, comprising: an optical coupler for contactless switching operation by receiving the auxiliary switch driving signal; and an active level control when the optical coupler is turned on to control an active level And a triac providing a signal to the loads.

Preferably, the auxiliary switch driving signal is characterized in that the MOC driving signal indicating the on / off operation state of the high voltage circuit breaker or TOC driving signal indicating the insertion state of the high voltage circuit breaker.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

1 is a block diagram of an auxiliary switching device of a high-voltage circuit breaker according to an embodiment of the present invention. The two optical couplers 121 and 123 switched on and off by the MOC driving signal and the TOC driving signal provided from the high voltage circuit breaker 110, and the current control unit 2 connected to the respective optical couplers 121 and 123. Triacs 122, 124, and a power supply 125. The power supply unit includes a transformer T1 for receiving and rectifying external commercial power, a bridge diode D1, a rectifying capacitor C1, and a regulator 126 for outputting an input voltage as a constant voltage 12V. .

Hereinafter, the operation and effects of the auxiliary switch device of the high-voltage circuit breaker configured as described above are as follows.

As described above, when the operating state of the high-voltage circuit breaker is changed to a trip, on, or off state, the mechanical lever is interlocked by the mechanical operation of the high-voltage circuit breaker, thereby contacting or contacting the contacts of the auxiliary switching device. Separated. At this time, the control signals are provided to the loads of the subsequent stages according to the contact state of the contacts of the auxiliary switching device. Auxiliary switching device of such a high voltage circuit breaker is a mechanical operating contact (MOC) switch and a truck operating contact (TOC) switch. The MOC switch is a switch for checking the driving state of the inserted high voltage circuit breaker, and the TOC switch is a switch for checking whether the high voltage circuit breaker is inserted.

The present invention proposes a method of implementing the above-described MOC switch and TOC switch using a solid state electrical switch instead of a mechanical switch.

When the high voltage circuit breaker is inserted, an active TOC driving signal is output from the high voltage circuit breaker, and the photodiode of the second optical coupler 123 conducts light emission by the signal. As the phototransistor receiving the light is turned on, a control voltage of 12V is provided to the gate terminal of the second triac 124 through the phototransistor of the second optical coupler 123. At this time, while the second triac 124 is turned on, the control voltage of 12V is provided to the loads of the rear stage through the second triac 124. In this case, when the high level TOC signal is provided from the second triac 124, the loads perform the operation accordingly.

When the high voltage circuit breaker is removed, the second optical coupler 123 and the second triac 124 are switched off, and a low level TOC signal is provided to the loads of the subsequent stages, and the loads perform the operation accordingly.

On the other hand, when the inserted high voltage circuit breaker 110 is turned on, a high level MOC drive signal is output from the high voltage circuit breaker 110, and the first optical coupler 121 and the first triac 122 are driven by the MOC drive signal. This switching on provides a high level MOC signal to later loads. At this time, the loads perform the operation accordingly. Meanwhile, when the inserted high voltage circuit breaker 110 is turned off, the first optical coupler 121 and the first triac 122 are switched off, and a low level MOC signal is provided to the loads of the rear stages. Perform the action.

On the other hand, the control voltage of 12V used in the contactless auxiliary switching device 120 is provided by the power supply 125, when the commercial AC power is input to the transformer (T1), the transformer transforms the commercial AC power. The bridge diode D1 rectifies the transformed AC power, and the smoothing capacitor C1 smoothes the rectified power. The regulator 126 is a kind of voltage controller that outputs a constant voltage regardless of a change in the input power, and a control voltage of 12V is output from the regulator 126. The generated 12V control voltage is used as the driving voltage of the optical coupler and the triac.

Although this invention has been described based on the preferred embodiments above, this embodiment is intended to be illustrative and not restrictive. It will be apparent to those skilled in the art to which the present invention pertains that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the present invention. Therefore, the protection scope of the present invention will be limited only by the appended claims, and should be construed as including all such changes, modifications or adjustments.

According to the present invention as described above, by controlling the important signals to start and stop the load of the rear stage, such as the operation state of the high-voltage circuit breaker, the closing and closing command during tripping, etc. through a reliable contactless switching action, the load due to malfunction There is an effect that can prevent the failure situation in which the generator is stopped to stop.

Claims (3)

In the auxiliary switching device of the high voltage circuit breaker that receives the auxiliary switch driving signal according to the driving (trip), on / off (off) of the high voltage circuit breaker and provides a control signal to the loads of the subsequent stage. , An optical coupler configured to receive the auxiliary switch driving signal and perform contactless switching; And a triac providing an active level control signal to the loads when the optical coupler is turned on. The contactless auxiliary switch device of the high voltage circuit breaker according to claim 1, wherein the auxiliary switch driving signal is a MOC driving signal indicating an on / off operation state of the high voltage circuit breaker. The solid state auxiliary switch device of the high voltage circuit breaker according to claim 1, wherein the auxiliary switch driving signal is a TOC driving signal indicating whether the high voltage circuit breaker is inserted.