KR20020081657A - Automatic closing circuit of CB - Google Patents

Abstract

It is an object of the present invention to set a time after re-entry after a trip occurs due to an instantaneous interruption or voltage abnormality of breakers and vacuum breakers (VCB) installed on the special high voltage and high voltage lines of the water substation. After the elapse of time, it is to provide an automatic closing circuit of a circuit breaker which automatically causes a closing operation after reset.

The circuit breaker automatic closing circuit of the present invention includes a first timer (TE1) operated by turning on the phase- and reverse-phase electrostatic monitoring contact (PO-1) or the low voltage monitoring contact (UV-1); A reset relay (REX) operated by the on-time contact (TE1-1) of the first timer; The third circuit is operated by the a contact REX-3 of the reset relay and further includes a series circuit of the off-time contact TE3-1 of the third timer and the on-time contact TE4-1 of the fourth timer. A second timer (TE2) operated by a series circuit of an off-time contact (TE3-1) and a contact (TE2-1), which is an instantaneous contact of the second timer; A third timer (TE3) operated by an on-time contact (TE2-2) of the second timer further inserted in series with the operating voltage line of the second timer; An input relay (CAX) operated by the b contact REX-4 of the reset relay further inserted into the operating voltage line of the third timer; A fourth timer (TE4) operated by the on-time contact (TE3-2) of the third timer; A remote input contact point CX-1 connected in series with the remote position R of the operation mode selector switch MS for inputting an operating voltage to the input coil end of the breaker VCC; An automatic input selector switch S1 connected in parallel with the remote input contact, a series circuit of a contact CAX-1 of the input relay and b contact REX-1 of the reset relay.

The circuit breaker automatic closing circuit of the present invention enables automatic reset and automatic closing without an administrator in case of momentary power interruption or instantaneous low voltage accident on the input and output side, thereby enabling unmanned management of the high-voltage water substation facility.

Description

Automatic closing circuit of breaker {Automatic closing circuit of CB}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a close and trip control circuit of a circuit breaker or a vacuum circuit breaker (VCB) installed in a high or extra high voltage input and output terminal of a water substation. Therefore, even if the administrator cancels the trip state after the breaker trips and does not perform (special) high-pressure closing operation, it relates to the automatic closing circuit of the circuit breaker so that the closing operation occurs automatically after the set time has elapsed.

Each group of power utilities, such as schools, buildings, apartment complexes and factories, have faucets and substations to receive the power they need.

Such water substations are equipped with transformers, switches and other safety devices to receive high or extra high voltages supplied from KEPCO substations and convert them to commercial voltages of appropriate low voltage.

In particular, the water substation facility is equipped with a number of switch devices, among which the vacuum circuit breaker is mounted on the high-voltage inlet side serves to block the high-voltage inlet quickly when a power failure or other voltage unstable.

1 is a block diagram of a water substation of a general high voltage inlet.

As referred to herein, the (high) pressure transformer introduced from the KEPCO side is applied to the customer side through the circuit switch, the instrument transformer (MOF), the vacuum circuit breaker (VCB), and the high voltage transformer (Δ-Υ). The vacuum circuit breaker is to be tripped and turned on by the VCB closing and closing circuit, and the contact signal by the abnormal voltage monitoring relay (UV) and the electrostatic monitoring relay (PO) is connected to the VCB closing and closing circuit. The low voltage (100 V) through the low voltage converter for converting the high voltage to the low voltage is applied to the abnormal voltage monitoring relay and the power failure monitoring relay.

2 shows a detailed configuration of the VCB input and shut down circuit.

Here, the operation mode selector switch (MS) uses a switch having two positions, a local position (L) and a remote position (R), and the cam position (CS) connected to the local position (L) above the position thereof According to (on or off), the operating current is selectively supplied to the input coil (not shown) and the trip coil (not shown) of the vacuum circuit breaker (VCB).

In the above remote position (R), a remote input contact point (CX-1) and a remote trip contact point (TX-1) for remote control of the vacuum breaker are connected to the input coil and trip coil of the vacuum breaker selectively through these contacts. Connect the operating current to

In addition, the trip coil end of the vacuum circuit breaker VCB connects the contact point UV-1 of the low voltage monitoring relay, the contact point OV-1 of the overvoltage monitoring relay and the contact point PO of the electrostatic monitoring relay. When one is on, the vacuum circuit breaker is tripped. In addition, a buzzer BZ is connected in parallel to the trip coil end.

Referring to the operation of the conventional vacuum circuit breaker configured as described above are as follows.

First, when the operation mode selector switch MS is in the local position and the cam switch CS is in the off position, an operating current is applied to the trip coil of the vacuum circuit breaker VCC to operate the magnet therein. It will cut the high voltage line. Subsequently, when the cam switch CS is placed in an on position, an operating current is applied to an input coil inside the vacuum circuit breaker, and the high voltage line is connected by the operation of the magnet inside the vacuum circuit breaker.

This operation is similarly performed by the selective operation of the remote input contact point (CX-1) and the remote trip contact point (TX-1) installed at the remote site, and the high voltage line is input and blocked by the vacuum breaker (VCB). The vacuum circuit breaker trips and disconnects the high voltage line even when any one of the respective contacts (UV-1, OV-1, PO-1) of the low voltage monitoring relay, the over voltage monitoring relay and the power failure monitoring relay is turned on. do.

If there is a break in the high-voltage line, the buzzer (BZ) connected in parallel to the trip coil is activated to inform the manager of a problem in the power supply circuit.

This vacuum circuit breaker is tripped even in case of momentary power failure, and after restoring the power supply, the manager should operate the above-mentioned cam switch or remote input contact point.

Therefore, if the power supply to the customer side is cut off by the tripping operation of the vacuum circuit breaker and the power supply is not monitored and the manager does not recognize it, the operation of the vacuum circuit breaker for the rapid connection of the high-voltage line cannot be made, and the customer side is inadvertently damaged. Will wear.

In particular, if the vacuum breaker is tripped when the manager cannot be attached to each vacuum breaker, the power supply disconnection state can only be continued until someone switches the vacuum breaker to the input mode.

An object of the present invention is to provide a circuit breaker or a vacuum circuit breaker installed at the high-voltage or extra-high voltage input and output of the water substation facility to automatically turn on the line connection after a set time elapses after a trip occurs due to power failure or voltage abnormality. Therefore, the present invention provides an automatic input circuit of a circuit breaker capable of unmanned management of a high or special high pressure water substation facility.

Another object of the present invention is to enable effective interruption of the customer by performing a repetitive closing operation until the recovery point of the power failure, such as a power failure in case the power failure accident is not recovered such that the set re-insertion preparation time elapses after the trip occurs in the circuit breaker It is to provide a circuit breaker automatic input circuit that can minimize the time.

Still another object of the present invention is to design a circuit breaker automatic input circuit for limiting the tripping / injection of a circuit breaker by monitoring a power failure or momentary power interruption occurring at the input and output side of the water substation facility, all of the standby relays are turned off. This prevents the relay from extending the service life and unnecessary power consumption by preventing current from being supplied to their operating coils and by shutting off and supplying the operating current to the relay coil only when a monitoring signal such as momentary power interruption or undervoltage is generated. It is to provide an automatic closing circuit of a circuit breaker.

1 is a schematic block diagram of a conventional high-voltage water substation.

FIG. 2 is a detailed circuit diagram illustrating a trip / input control circuit of the circuit breaker of FIG. 1.

3 is a schematic circuit block diagram of the high-voltage water substation facility of the present invention.

4 is a detailed circuit diagram of the automatic injection control circuit of the circuit breaker of the present invention.

※ Explanation of symbols about main part of drawing ※

VCB: Circuit Breaker RY: Input Limit Relay

REX: Reset relay CAX: Input relay

TE1-TE4: Timer UX: Test Relay

LAMP: Lamp S1: Automatic Input Selector Switch

S2: Test Switch CS: Cam Switch

MS: Operation mode selection switch CX-1: Remote input contact

TX-1: Remote trip contact UV-1: Abnormal voltage monitoring contact

PO-1: Power failure monitoring contact 10: Circuit breaker closing

20: circuit breaker automatic input circuit 30: test circuit

Vacuum circuit breaker automatic closing circuit of the present invention for achieving the above object comprises a first timer to operate by the on of the electrostatic monitoring contact and the abnormal voltage monitoring contact, and a reset relay operated by the on time contact of the first timer; And a, which is operated by the contact a of the reset relay and is a series circuit of the off time contact of the third timer and the on time contact of the fourth timer, the off time contact of the third timer and the instantaneous contact of the second timer. A second timer actuated by the series circuit of the contact, a third timer actuated by the on-time contact of the second timer additionally inserted in series into the actuating voltage line of the second timer, and an actuating voltage of the third timer An input relay operated by the contact b of the reset relay further inserted into the line, a fourth timer operated by the on-time contact of the third timer, and a remote of the operation mode selection switch A remote input contact for inputting an operating voltage to the input coil stage of the vacuum circuit breaker connected in series with the position, an automatic input selection switch connected in parallel with the remote input contact, a contact of the input relay and b of the reset relay. It characterized in that it comprises a series circuit of contacts.

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

3 is a block diagram of the water substation of the high voltage inlet of the present invention.

As referred to here, the water transformer system has a special high voltage drawn from the KEPCO side through a circuit switch, an instrument transformer (MOF), a circuit breaker or a vacuum circuit breaker (VCB), and a high voltage transformer (Δ-Υ). The circuit breaker is applied to the circuit breaker and the tripping and closing operation is performed by the VCB closing and closing circuit 10, and the closing and tripping circuit 10 has a low voltage monitoring relay (UV) and an open phase and reversed phase electrostatic monitoring relay ( Each contact signal by PO) is applied, and a low voltage (100 V) through a low voltage converter for converting a high voltage into a low voltage is applied to the low voltage monitoring relay and the phase-out electrostatic monitoring relay. In addition, the input and interruption circuit 10 is inserted into the automatic input circuit 20 so that the input current is automatically supplied to the input coil of the circuit breaker or the vacuum circuit breaker (VCB) according to the given conditions so that the connection of the extra high voltage line is reached. Configure.

Figure 4 shows a specific configuration of the automatic closing circuit including the closing and closing circuit of the circuit breaker or vacuum breaker (VCB).

As described herein, the input / block circuit 10 uses a switch having an operating mode selection switch MS having two positions, a local position L and a remote position R, and the local position L above. Connect the cam switch CS so that the respective operating currents are selectively supplied to the input coil (not shown) and trip coil (not shown) of the circuit breaker or vacuum breaker (VCB) according to their position (on or off). In the above remote position (R), a remote input contact point (CX-1) and a remote trip contact point (TX-1) for remote control of the vacuum breaker are connected to the input coil and trip of the vacuum breaker selectively through these contacts. It is composed by connecting the coil so that working current is applied.

The automatic input circuit 20 including the VCB has the following configuration.

When the low voltage monitoring contact (UV-1) or the phase and reverse phase outage monitoring contact (PO-1) turns on due to an abnormal voltage or power failure on the incoming high voltage or extra high voltage line, the first timer (TE1) and the input limit relay (RY) connects to drive.

The reset relay REX is driven to be driven by the on-time contact TE1-1 of the first timer TE1.

The second timer TE2 is driven so as to be driven by the contact a REX-3 of the reset relay REX. In addition, the second timer TE2 is a series circuit of the off-time contact TE3-1 of the third timer and the on-time contact TE4-1 of the fourth timer, or the off-time contact TE3-1 of the third timer. And driven by a series circuit of the instantaneous contact TE2-1 of the second timer.

The driving voltage applied to the second timer TE2 is connected to the third timer TE3 as a driving voltage through the on-time contact TE2-2 of the second timer.

The driving voltage applied to the third timer TE3 is connected to the input relay CAX as a driving voltage through the b contact REX-4 of the reset relay.

The fourth timer TE4 is driven to be driven by the on-time contact TE3-2 of the third timer.

In parallel with the remote input contact (CX-1), the automatic input selection switch (S1), the b contact (RY-1) of the input limiting relay, the a contact (CAX-1) of the closing relay and the b contact (REX) of the reset relay Connect series circuit by -1).

In addition, a test circuit 30 for testing a normal operating state of the circuit breaker automatic input circuit 20 is inserted into the input coil side of the circuit breaker or the vacuum circuit breaker VCB.

The test circuit connects a test lamp (LAMP) to the input coil side of the circuit breaker or vacuum breaker (VCB), and the test relay (UX) is driven by the test switch (S2), and the contact a of the test relay ( UX-1) connects the test relay to the self-holding via the reset switch RES and the reset relay b contact (REX-2), and the low voltage monitoring contact by the other a contact (UX-2). Or connect to generate the same signal as the reverse-phase and phase-out electrostatic monitoring point (PO-1) signal.

Here, the contact a is a contact which is turned on when the relay is driven and the contact b is a contact which is turned off when the relay is driven.

Referring to the operation of the present invention configured as described above are as follows.

First, the automatic input operation mode of the vacuum circuit breaker is selected by turning on the automatic input selection switch S1 of the VCB automatic input circuit 20 while the operation mode selection switch MS is located at the remote position R. FIG.

When the automatic input selection switch S1 is kept in the off state, it is necessary to re-input after manual power failure at a remote site using the remote input contact point CX-1 in the conventional manner.

In this state, when the automatic input selector switch S1 is turned on, the high voltage or extra high voltage on the side of the human terminal is in a low voltage state, or an open phase, a reverse phase, an instantaneous power failure occurs, and a low voltage monitoring contact (UV-1) or a power failure monitoring contact ( When PO-1) is turned on, a driving current is input to the first timer TE1 and the input limiting relay RY.

The first timer TE1 is a timer for securing an input preparation time after a power failure. For example, if the setting time value of the timer is 60 minutes, the maximum setting value of the input preparation time after power failure is 60 minutes.

The input limit relay RY always maintains a driving state in the state where the power failure monitoring contact signal or the abnormal voltage monitoring contact signal is being generated, so that the contact point RY-1 cuts the circuit breaker automatic reinsertion circuit. do. That is, it is limited to prevent the re-insertion of the inter-vehicle in a state in which an electrostatic accident is maintained.

As described above, after the power failure accident or the like has occurred, the power failure accident or the like is soon restored, and the low voltage monitoring contact UV-1 and the phase-opening and reverse phase power failure monitoring contact PO-1 are returned to the off state and the first state is returned. When the timer TE1 reaches the preparation preparation time after the power failure previously set, the on-time contact TE1-1 of the first timer is temporarily turned on and then returned to off.

At this time, since the instantaneous driving current flows through the reset relay REX, the reset relay is operated to generate the on contact or off contact signals. That is, the breaker automatic input circuit is opened and closed by the b contact REX-1 of the reset relay, and the test circuit is opened and closed by the b contact REX-2.

Also, the second timer TE2 is started by the a contact REX-3 of the reset relay, and the off-time contact TE3- of the magnetic a contact TE2-1, which is its instantaneous contact, and the third timer. The magnetic circuit is held by the series circuit of 1), and the input relay (CAX) drive circuit is opened and closed by another contact b (REX-4).

The second timer TE2 is a timer for setting the reset time and may be designed to have a maximum timing setting time of 60 seconds, for example.

When the reset time set by the second timer TE2 is reached, the closing relay CAX is activated the moment the on-time contact TE2-2 is turned on. That is, the input relay CAX includes the off-time contact TE3-1 of the third timer, the instantaneous contact TE2-1 of the second timer, the on-time contact TE2-2 of the second timer, and the reset relay. Is driven by a series circuit formed by contact b of REX-4.

Therefore, at the closing coil end of the breaker or vacuum breaker (VCB), the remote position (R) of the operation mode selection switch (MS), the automatic closing selection switch (S1), the b contact (RY-1) of the closing limit relay, and the closing relay. The operating current is supplied through the series circuit of contact a of contact (CAX-1) and reset relay of contact b (REX-1), and closing operation occurs in the vacuum circuit breaker. Connect it.

However, even if the preparation time after the power failure set by the first timer TE1 has elapsed, if the power failure state or the like is maintained, the input relay CAX operates to turn on the contact CAX-1. Even if the input limiting relay RY will continue to operate, its contact point RY-1 is opened and the closing operation of the vacuum breaker is not performed.

In this case, if the power failure is not recovered when the preparation preparation time is exceeded after the power failure, the vacuum circuit breaker is input to the recovery point of the power failure at regular intervals by the interlocking operation of the third timer (TE3) and the fourth timer (TE4). Supplying current to the coil.

When the operating current is supplied to the input relay CAX after the preparation preparation time after the blackout, which is determined by the first timer TE1, the operating current is applied to the third timer TE3. The third timer TE3 is set at a closing time of about 4-5 seconds, and an operating current is applied to the fourth timer TE4 when the on-time contact TE3-2 of the third timer is turned on. do. At the same time, the off-time contact TE3-1 of the third timer is opened to cut off the operating voltage applied to the second timer TE2, the input relay CAX, and the third timer TE3.

As a result, the off-time contact TE3-1 of the third timer is returned to the on state and the on-time contact TE4- is set according to the timing operation of the fourth timer TE4 which is set to a time value of about 1 second to about 5 seconds. At the moment 1) is turned on, an operating voltage is applied to the second timer TE2, which is maintained by the magnetic contact TE2-1.

At this time, the fourth timer TE4 is returned and its contact TE4-1 is opened. That is, the contact TE4-1 of the fourth timer generates an on-contact signal at the timing completion time of the fourth timer to operate the second timer.

On the other hand, when the operation of the second timer is reached and the reset time determined by this (for example, within 60 seconds) is reached, the on-time contact TE2-20 of the second timer is turned on. If it is, the input limit relay (RY), reset relay (REX) and the first timer (TE1) will all remain off, so the input relay (CAX) will operate to supply the input current to the input coil side of the vacuum circuit breaker. The circuit will be configured.

If the power failure is not restored at that time, the above operation is repeated and the input current is automatically supplied to the input coil of the vacuum circuit breaker when the power failure is recovered, and the high voltage line is connected by the operation of the magnet. .

When the test switch S2 installed in the test circuit 30 is turned on, an operating voltage is input to the test relay UX, and the a contacts UX-1 and UX-2 are turned on.

The a contact point UX-1 forms a series circuit together with the reset switch RES and the contact point REX-2 of the reset relay to self hold the test relay UX, and the other a contact point UX. -2) generates the same test signal as the low voltage monitoring contact signal that monitors the occurrence of abnormality by monitoring the power failure monitoring contact signal generated when a momentary power failure on the input side or the low voltage state of the input side is generated. The operating voltage is applied to the relay RY and the first timer TE1.

The organic series of operations of the relays and the timers by the operation of the test switch of the test circuit is the same as described above.

This test circuit is reset as soon as the operator or manager presses the reset switch RES or the reset relay REX is activated.

In addition, by connecting the lamp (LAMP) in parallel to the closing coil side of the vacuum circuit breaker it can be confirmed whether the closing operation during the test is performed correctly.

As described above, the present invention automatically resets a high voltage or specially after a set time defined by a timer after a circuit breaker or a vacuum circuit breaker installed on a high-voltage line of a water substation occurs due to a power failure or an input low voltage. The circuit breaker input operation to connect the high-voltage incoming line occurs to bring about the unique effect of unmanned management of the high-voltage water substation facility.

In addition, in the present invention, if the power failure is not recovered after the reset preparation preparation time elapses after the trip, it is possible to minimize the effective power outage time of the customer because the repetitive closing operation is performed until the recovery point of the power failure, such as a regular cycle. Brings effect.

In addition, the present invention makes it easy to check whether the operating voltage is normally applied to the input coil side of the circuit breaker when the power failure is recovered through a test circuit added to the circuit breaker or the automatic circuit breaker automatic input circuit.

In addition, the present invention is to design a circuit breaker automatic input circuit for limiting the trip / input of the circuit breaker installed on the high-voltage line by monitoring the power outage or momentary power interruption occurring on the inlet end side of the high-voltage or extra-high voltage line of the water substation facility At the same time, the standby circuit relays are kept off so that no current is supplied to their operating coils, and the operating coils are supplied to the relay coils only when the monitoring signal such as momentary power interruption or low voltage is generated and then shut off. It has the unique effect of preventing relay life extension and unnecessary power consumption.

Claims (3)

A first timer TE1 operated by the on-phase and reversed-phase outage monitoring contact PO-1 and the low voltage monitoring contact UV-1; A reset relay (REX) operated by the on-time contact (TE1-1) of the first timer; The reset circuit operates by the contact a (REX-3) of the reset relay and further comprises a series circuit of the off-time contact (TE3-1) of the third timer and the on-time contact (TE4-1) of the fourth timer. A second timer (TE2) operated by a series circuit of a contact (TE2-1), which is an off-time contact (TE3-1) of the timer and an instantaneous contact of the second timer; A third timer (TE3) operated by an on-time contact (TE2-2) of the second timer further inserted in series with the operating voltage line of the second timer; An input relay (CAX) operated by a b contact (REX-4) of the reset relay further inserted into the operating voltage line of the third timer; A fourth timer (TE4) operated by the on-time contact (TE3-2) of the third timer; A remote input contact point CX-1 connected in series to the remote position R of the operation mode selector switch MS for inputting an operating voltage to the input coil end of the circuit breaker; And a series circuit of an automatic input selection switch S1 connected in parallel to the remote input contact point, a contact point CAX-1 of the input relay and b contact REX-1 of the reset relay. Automatic closing circuit of breaker. The method of claim 1, wherein the input limiting relay (RY) is inserted at both ends of the first timer (TE1) to prevent unnecessary vacuum circuit breaker closing operation when the power failure is not restored. Automatic input selector switch S1, in which contact RY-1 is connected in parallel with the remote input contact CX-1, contact a of contact input CAX-1 and contact b of reset relay REX-. An automatic closing circuit of a circuit breaker characterized by being inserted in series with a series circuit consisting of 1). 3. The test switch S2 according to claim 1 or 2, a test relay UX operated by turning on the test switch, and a contact point REX-2 of the reset switch RES and the reset relay. In addition, the input limit is generated by generating the same test signal as the contact a of the test relay UX-1 and the power failure monitoring contact signal or the abnormal voltage monitoring contact signal to maintain the test relay UX in a series circuit. To display the presence or absence of an abnormal operation of the automatic input operation by being connected to the contact point UX-2 of the relay RY and the first timer TE1 and the input coil end of the vacuum circuit breaker VCB. Automatic input circuit of a circuit breaker, characterized in that the test circuit (30) consisting of a lamp (LAMP) is further mounted.