JPS61296621A - Switch apparatus controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching equipment control device that controls WJ of switching equipment that opens and closes a power circuit.

[Conventional technology]

FIG. 2 shows a conventional switchgear control device. In the figure (
/) is the power bus, (2) is the load, (3) is the load (
2) is a switching device that connects to and disconnects from the power bus (1), and here it is a switch. In addition, (4'l is the drive circuit of the switch (3), (3) is the "open" operation switch, (
A) is a "close" operation switch.

Next, the operation will be explained. In this configuration, when the "open" operation switch (1) is operated, the drive circuit (da) is activated, the switch (3) is opened, and the "close" operation switch (
When 6) is operated, the drive circuit (lIl) is activated and the switch (3) is closed.

[Problem that the invention seeks to solve]

Since the conventional switchgear control device is configured as described above, the drive circuit operates to open or close the switch (3) at the moment the operation switch is operated.
If the load (, 71) is a transformer, a large inrush current will flow depending on the phase conditions when the circuit is closed.

There was a problem with the strength of the load transformer. In particular, in the case of load circuits that are frequently opened and closed, the structure must be strengthened to withstand repeated inrush currents, making it necessary to use transformers with poor cost performance.

This invention was made to solve the above-mentioned problems, and provides a switchgear control device that reduces inrush current by controlling the timing of opening and closing of the switchgear. The purpose is to provide.

[Means for solving problems]

The switching equipment control device according to the present invention includes an instrument transformer for detecting the bus voltage of a power bus, a phase of the bus voltage detected by the instrument transformer, and a timing signal generated at a predetermined phase. an AND circuit that generates an output under an AND condition of a timing signal from the voltage phase detector and an opening/closing command signal from the operating switch; It includes a timer that controls the temporal timing of the output of this AND circuit, and a drive circuit that opens and closes the switching device according to the output of this timer.

[For production]

Switching device according to this invention? ! The button device is in the tlJ control device.

Since the bus voltage is detected and the opening/closing timing of the switching equipment can be determined based on the phase of the bus voltage, inrush current can be kept small.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 1. In FIG. 1, (1) to (6) are the same as the conventional device shown in the diagram. (ri) is the power bus (
1) Potential transformer for detecting the bus voltage.
is a voltage phase detector that detects the phase of the bus voltage detected by this instrument transformer and generates a timing signal (n) at a predetermined phase; (9) and (10) are "open" operation switches (, Open/close command signal (B) generated from the "open" operation switch (t), r close operation switch (6) (only the open command signal is generated from the "open" operation switch (r), and the close command signal is generated from the "close" operation switch (6)) signal only).

and a voltage phase detector (an AND circuit that generates an output according to the AND condition of the timing signal from fl).

Further, (//) and (/J) are timers that control the temporal timing of the outputs of these AND circuits (9) and (10), respectively.

Next, the operation will be explained. An instrument transformer leads the voltage of the power bus (1) to a voltage phase detector (fl).

The voltage phase detector (t) detects when the phase of the bus voltage is in a predetermined phase K.
When i occurs, a timing signal is generated. In the simplest method, the voltage phase detector (l:) may detect the zero value passing point of the voltage and generate a timing signal in accordance with this. The above voltage phase detector (timing signal from fl, and each operation switch (, tl,
By taking the AND conditions of the opening/closing command signal (Bl) from +A) using AND circuits (RI) and (/+7), respectively.

Controls the voltage phase when the switch (3) is opened or closed. Nine timers (//) and (/2) are provided to adjust the overall timing of the control device since the switch (3) has a time delay due to the drive circuit on the side. Therefore, in actual control, the detection phase by the voltage phase detector (fl) is kept constant, the timer (/i) and (/s) are used to correct the operating time delay unique to the switch (3), and the timing of closing and opening is Phase t-am clause.Timer (//) A/
2) is adjusted so that the residual magnetic flux remaining in the load transformer, which is the load (2) when the circuit is open, and the initial magnetic flux when the circuit is closed are combined to reduce the transient 8 flux.

In the above embodiment, the switching device is a switch (contactor).
Although the case has been described, this may also be a circuit breaker, for example.

〔Effect of the invention〕

As described above, according to the present invention, the timing of the opening and closing operations of the switching equipment can be determined based on the phase of the bus voltage, so that the inrush current can be kept small, and the load transformer, which is the load, can be The advantage is that it is possible to construct an inexpensive system without worrying about special reinforcement.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a switchgear control device according to the present invention, and FIG. 2 is a block diagram of a conventional switchgear control device. In the figure, (1) is the power bus, (λ) is the load, and (3)
is the switch, (4'l is the drive circuit, (evening) is the "open" operation switch, (6) is the "close" operation switch, (7) is the instrument transformer,
(g) is a voltage phase detector, (q), (/(7) is AND
Circuit, (//), (/2) Vi timer. In Figure 1, the same reference numerals indicate the same or equivalent parts. ) circuit "'QfFL HISUKURI SWITCH 6: 1m, HISUZUKURI SUISHINA 7: tiM, for transformer 8;

Claims (3)

[Claims] (1) An instrument transformer for controlling switching equipment installed between a power bus and a load in a power circuit, and for detecting the bus voltage of the power bus, and this instrument transformer. a voltage phase detector that detects the phase of the bus voltage detected by the device and generates a timing signal at a predetermined phase; an operation switch that generates an opening/closing command signal for the switching equipment; and a timing signal from the voltage phase detector. an AND circuit that generates an output according to the AND condition of the opening/closing command signal from the operating switch; a timer that controls the temporal timing of the output of the AND circuit; and a timer that controls the opening/closing equipment according to the output of the timer. A switching device control device comprising a drive circuit for opening and closing. (2) The switching device control device according to claim 1, wherein the switching device is a switch. (3) The switchgear control device according to claim 1, wherein the switchgear is a switch.