KR960027120A - Automatic opening / closing control device for fault section of distribution line - Google Patents

Abstract

The present invention relates to an automatic opening and closing control device of a fault line of a distribution line. When a phase current and a ground fault current are generated by currents flowed from three current transformers, a ground fault current is transmitted and rectified by a matching transformer to ensure reliable phase and ground fault. It adopts the self-voltage current method that divides the voltage of the relative ground, not the external auxiliary power source, with a high voltage capacitor and a matching transformer, and reduces the line current under a certain value during light load operation or after failure detection. The fault current is eliminated. If the fault current is 800A or more while the COR or OCGR is operated when it lasts for 1 ~ 1.5 cycles after the fault detection by the transient or permanent fault discrimination unit or when the back protection device is operated, the lock current detector In the no-voltage non-current state that is locked by To be the one to occur stable and automatic opening and closing of the fault section by convenient to generate a trip current.

Description

Automatic opening / closing control device for fault section of distribution line

Since this is an open matter, no full text was included.

1 is a block diagram showing a schematic configuration of the present invention, Figure 2 is a circuit diagram showing a detailed configuration of the present invention.

Claims (4)

A phase current forming unit 1 for proportionally detecting the magnitude of the current flowing in the distribution line, and a power supply voltage unit receiving the current of the distribution line via the phase current forming unit 1 and outputting it at a reference voltage and a control voltage. (2) and a ground fault detector (3) for determining whether there is a fault current according to the ground fault voltage while forming a ground fault voltage proportional to the line current by receiving the phase current from the phase current forming unit (1), and the phase current forming unit Phase detection unit (4) for receiving the phase current from (1) and forming a phase voltage proportional to the line current, and determining whether there is a fault current according to the phase voltage, and the ground and phase detection units (3) and (4) described above. Over Current Ground Relay (OCGR) (5), which has an operating characteristic that cooperates with the damage characteristic curve of the transformer, the operating characteristic of the back protection device, and the fuse characteristic curve while operating at an operating timing proportional to the line current by the output of Over Current Relay (OCR) (6 ) And when the output from the above-mentioned phase detection unit 4 is a large fault current equal to or greater than the rated breaking current 800A, it is locked. A predetermined delay time after the failure detection (1 to 1) to determine whether the output of the lock current detection unit 7 and the output of the ground and phase detection units 3 and 4 described above are transient failures caused by lightning, tidal currents, or tree contact. 1.5 cycles) and the transient / permanent fault discrimination unit 8 which outputs a signal for normal control operation or an open drive according to the state where the current flow disappears or the post protection device is operated, and the current is protected by the post protection device. The power storage unit 9 for outputting a trip driving signal in a state where there is no voltage and the output of the OCGR 5 and / or OCR 6 is above, and the transient / permanent failure discrimination unit 8 described above. Performs inrush contrast function by discriminating function The inrush current suppression unit 10, which prevents pick-up for a predetermined time during re-pressurization when the voltage is not applied to the current, and picks up immediately when re-joining the track in a state where a failure is experienced, and the OCGR 5 and An output section 11 which operates by the output of the OCR 6 and selectively turns off the switch by automatically tripping the coil under the influence of the lock detection section 7 and the transient / permanent fault discrimination section 8; The fault opening and closing circuit of the distribution line, characterized in that it consists of a fault display unit 12 to determine the presence or absence of a failure according to the output of the OCGR (5) and OCR (6). The transformer (T) according to claim 1, wherein the phase current forming unit (1) converts the voltage detected by the current transformers (1a), (1b), and (1c) installed in each phase (RST) into a high voltage capacitor and a matching transformer. A circuit for automatically opening / closing a failure section of a distribution line that is detected as a ground fault current and a phase current through a full-wave rectifier circuit BP1 and BD2. The transient / permanent fault discrimination section 8 is a capacitor (1) when the transistor TR16 turned on by the power supply voltage section (2) is turned off by the ground fault detector (3) or the phase detector (4). Automatic failure section of the distribution line to judge that the voltage charged in C5) is applied as the comparison voltage of the comparator A6 so that the transient current is continuously applied for 1.0 to 1.5 cycles charged to the capacitor C5 as a permanent failure. Switching control circuit. The inrush current suppressing unit 10 determines that the transistor TR17 is turned off due to the output of the transient / permanent fault discrimination unit 10, and determines that the transistor TR21 is turned off so that the next circuit is closed. In the state where the transistor TR17 is turned off, the transistors RR20, TR21, and TR22 are sequentially turned on to turn on the diodes D5 and (the ground detection unit 3 and the phase detection unit 4). Automatic opening and closing control circuit for failure section of distribution line configured to suppress inrush current through D6). ※ Note: The disclosure is based on the initial application.