JPH06203688A - Circuit breaker controlling apparatus for phase adjusting facility - Google Patents

Abstract

PURPOSE:To prevent regeneration of an arc by sending a pole opening instruction while considering the detected current zero point and the pole opening time of the object circuit breaker. CONSTITUTION:To cut the current running in a shunt reactor 2 connected with an electric power system 1 through a circuit breaker 3 by the circuit breaker 3, a circuit breaker controlling apparatus for phase adjusting facility detects the current by a current transformer 4 and sends out a take-off order to the circuit breaker 3 at the very phase point. The output of the current transformer 4 is introduced into a pole opening phase controlling unit 6 and setting the time when the current is zero as a standard, the unit 6 sends out a pole opening instruction. Meanwhile, the circuit breaker pole opening instruction of the pole opening phase controlling unit is sent to a timer 8 (T1). The timer 8 (T1) is set at the time; the circuit breaker operation time + circuit breaker arc time + current detector recovery time. Consequently, in the case of no regeneration of an arc, there is no output of an AND circuit 9 and in the case of regeneration of an arc, there is an output and regeneration of an arc is detected and displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker control device for a phase-shifting equipment, in which a shunt reactor and a shunt capacitor are inserted into and disconnected from a power system to adjust reactive power.

[0002]

2. Description of the Related Art A shunt reactor for canceling leading power of a system for adjusting reactive power of a power system and a shunt capacitor for canceling lagging power of a system are shunted to a system via a circuit breaker. Connecting to is widely done.

FIG. 3 shows an example of such a system configuration, in which a shunt reactor 2 through which delay power for phase adjustment is supplied is connected to a power system 1 via a circuit breaker 3. . The shunt reactor 2 is shown as an example,
In general, a shunt capacitor is also provided through a suitable switching means so that the power can be advanced. In such a phase-adjusting facility, when the circuit breaker 3 is opened and closed to adjust the lag current or the lead current, for example, when the lag current flowing in the shunt reactor 2 is cut by the circuit breaker 3, the power system shown in FIG. As shown as voltage v and current i of 1, arc time (current i
If the time until it reaches zero) is short, the arc reignites in most cases, and an excessive surge voltage occurs at that time.
As a result, there is a problem that stress is applied to the circuit breaker connecting cable and the insulating portion of the shunt reactor 2 and the deterioration of those portions is accelerated.

[0004]

When the dielectric strength between the circuit breaker electrodes cannot withstand the voltage between the electrodes when the contacts are opened, the circuit breaks again.
FIG. 4 shows an example of the case where such a recurrent arc occurs. The surge voltage generated by the re-ignition is affected by the capacitance and inductance of the load side and power source side lines of the circuit breaker and the equipment.

Therefore, the present invention provides a circuit breaker control device for phase adjusting equipment which controls the opening of the circuit breaker and has a function of detecting re-arcing so that arcing does not occur when the reactive power device for phase shift is opened. The purpose is to do.

[0006]

In order to achieve the above object, a circuit breaker control device for phase adjusting equipment according to the present invention comprises a detecting means for detecting an alternating current of a power system in which a current to be interrupted flows, and an interrupter. Setting means for setting the opening time of the container, the arc time and the operating time of the electric circuit, and the current phase zero point of the AC electric quantity detected by the detecting means and the current based on each time set by the setting means. It is provided with tripping command means for outputting a tripping command at the time when the arc is extinguished at the zero point, and means for detecting re-arcing when the continuation of the current after the breaking target zero point is detected.

[0007]

The recurrent arc calculated by detecting the amount of alternating current in the power system, for example, the phase zero of the alternating current, and calculating based on the detected value, the contact opening time of the circuit breaker, the arc time and the operating time of the electric circuit. A trip command is issued at an appropriate trip command time so that it will not occur, and if a re-ignition occurs due to changes in the operating time of the circuit breaker, it is detected and displayed.

[0008]

EXAMPLE FIG. 1 shows an example of the present invention.

The circuit breaker controller 5 for the phase-adjusting equipment is the power system 1
In order to interrupt the current i flowing in the shunt reactor 2 connected to the shunt reactor 3 by the circuit breaker 3, the current i is detected by the current transformer 4 and tripped to the interrupter 3 at the appropriate phase point. It is a device that sends a command. The output of the current transformer 4 is introduced into the opening phase control unit 6. When the target circuit breaker arc time is T _ac and the circuit breaker 3 opening time is T _CB , the opening phase control unit 6 uses the time at which the current is zero as a reference to output the opening command time T _op. Output as.
That is, the zero point of the current phase is detected, and the opening command is issued so that the opening is performed at an appropriate phase point.However, if a re-arcing occurs due to a change in the operating time of the circuit breaker, etc. The output of the detector 7 is a continuous output even after the target cutoff zero point.

On the other hand, the circuit breaker opening command of the opening phase control unit is input to the timer T ₁ . Timer 8 (T ₁ ) is circuit breaker operating time (T _CB ) + circuit breaker arc time (T _ac ) +
Time is set to the current detector return time (T _i ). Therefore, when there is no re-arcing, there is no output from the AND circuit 9, and when there is re-arcing, there is output, and re-arcing detection is displayed.
The timer 10 (T ₂ ) is a timer for preventing unnecessary re-arcing detection due to variations in operation response time of the opening phase control unit, current detector and the like. FIG. 2 shows a time chart of the re-arc detection circuit.

[0011]

According to the present invention, an opening command is issued in consideration of the detected current zero point and the opening time of the target circuit breaker,
It is possible to perform the breaking operation for preventing the re-ignition and, when the re-ignition occurs due to the operation time variation of the circuit breaker or the like, display it.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a time chart for explaining the operation of this embodiment.

[Figure 3] Basic configuration diagram of the phase-adjustment equipment

[Fig. 4] Voltage when re-arcing occurs when the current is cut off
It is a current waveform.

[Explanation of symbols]

1 ... Power system, 2 ... Shunt reactor, 3 ... Circuit breaker, 4 ...
Current transformer, 5 ... Circuit breaker control device for phase adjusting equipment, 6 ... Opening phase control unit, 7 ... Current detector, 8 ... Timer, 9 ... A
ND circuit, 10 ... timer.

Claims (2)

[Claims] 1. A setting means for setting a contact opening time of a circuit breaker of a power system, an arc time and an operating time of an electric circuit, and a current based on a phase zero point of an AC electricity quantity and each time set by the setting means. Is equipped with a trip command means for outputting a trip command when it is calculated so that the arc is extinguished at the zero point of the arc, and a means for detecting and displaying a re-arc if the continuation of the current after the interruption target zero point is detected. A circuit breaker control device for phase modifying equipment. 2. The circuit breaker control device for phase adjusting equipment according to claim 1, further comprising means for preventing re-arcing detection display for a predetermined time after the breaking target zero point.