JP3661804B2 - DC high speed vacuum circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a DC high-speed vacuum circuit breaker that disconnects the movable main contact of a vacuum valve incorporating a main contact by high-speed opening driving by an electromagnetic repulsion coil of an electromagnetic repulsion circuit, such as disconnection of the electromagnetic repulsion circuit, etc. The present invention relates to a configuration of a DC high-speed vacuum circuit breaker having a monitoring function for monitoring the presence or absence of abnormality.
[0002]
[Prior art]
2 and 3 are configuration examples of a DC high-speed vacuum circuit breaker that is an object of the present invention, FIG. 2 is a circuit configuration example of the DC high-speed vacuum circuit breaker, and FIG. 3 is a movable main unit of the vacuum valve of FIG. It is an example of a structure of the electromagnetic repulsion circuit which drives a contact opening.
As a direct current high speed vacuum circuit breaker used for protection of ground faults and short circuit accidents in an electric railway power supply line, for example, the one having the configuration shown in FIG. 2 described in JP-A-7-114862 has been conventionally used. Are known. A DC high-speed vacuum circuit breaker having this configuration includes a vacuum valve 2 including a main contact 1 and an electromagnetic repulsion coil 3 that opens the movable main contact 1a of the main contact 1 shown in FIG. It consists of vessel 4.
The vacuum circuit breaker 4 is a commutation current for generating a zero point in the passing current of the vacuum valve 2 by being superimposed on the line current flowing out of the DC power source 5 of the line and passing through the main contact 1 in the vacuum valve 2 and flowing to the load. A commutation circuit 6 for generating a current, a DC current transformer 7 provided on the load side line of the vacuum valve 2 for detecting a line current, and a line current detected by the DC current transformer 7 due to a short circuit accident of the line, etc. A shut-off command for shutting down the vacuum circuit breaker 4 when a predetermined size is reached, and an input for paralleling the commutation circuit 6 to the vacuum valve 2 to create a zero point in the passing current of the vacuum valve 2 In order to suppress an overvoltage at the time of multiple re-ignition generated between the movable main contact 1a constituting the main contact 1 and the fixed main contact 1b when the vacuum valve 2 cuts off a small current. Non-linear resistance 9 .
[0003]
Since this type of vacuum circuit breaker 4 requires a high-speed opening operation, as a mechanism for opening the vacuum valve 2, the electromagnetic circuit comprising the electromagnetic repulsion coil 3 as shown in FIGS. 2 and 3 is used. A repulsion circuit 10 is configured. As shown in FIG. 3, the electromagnetic repulsion circuit 10 forms a flat ring shape by using a repulsion switch 13 to convert the current from the driving capacitor 12 charged by the charging device 11 when the movable main contact 1a of the vacuum valve 2 is cut off. The disk-shaped short-circuit plate 14 integrated with the movable main contact 1a in the vacuum valve 2 that flows through the formed electromagnetic repulsion coil 3 and is located close to the ring surface of the electromagnetic repulsion coil 3 A current opposite to the current flowing through the electromagnetic repulsion coil 3 is induced to flow, a repulsive force is generated between these currents, and the movable main contact 1a is connected via an opening / closing operation rod 23 fixed to the short-circuit plate 14. Is driven at high speed.
[0004]
[Problems to be solved by the invention]
In the method of driving the vacuum valve 2 using the electromagnetic repulsion force between the electromagnetic repulsion coil 3 and the short-circuit plate 14 due to the current from the charged driving capacitor 12, the current is supplied to the electromagnetic repulsion coil 3. The drive capacitor 12 which is a power source for generating a repulsive force holds a predetermined charging voltage by the charging device 11, and the electromagnetic repulsion circuit 10 is disconnected so that the electromagnetic repulsion coil 3 functions normally. It is important for maintenance management to monitor for abnormalities.
However, conventionally, only the monitoring of the charging voltage of the driving capacitor 12 has been performed to monitor the circuit of the electromagnetic repulsion circuit 10, and whether or not the driving operation of the vacuum valve 2 by the electromagnetic repulsion circuit 10 is normally performed. For the inspection, for example, at the time of periodic inspection, only the method of confirming by actually opening the main contact 1 of the vacuum valve 2 by the electromagnetic repulsion circuit 19 has been adopted. Therefore, it has been desired to establish a monitoring method for routinely checking and inspecting whether a DC high-speed vacuum circuit breaker in a normally operating state operates normally.
[0005]
An object of the present invention is to solve the above-mentioned problem and to provide a monitoring function capable of monitoring whether the driving mechanism of the vacuum valve by the electromagnetic repulsion circuit operates normally even when the DC high-speed vacuum circuit breaker is in operation. It is to provide a circuit breaker.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention relates to a charging voltage of a driving capacitor flowing through an electromagnetic repulsion coil, a voltage detection sensor connected in parallel to the driving capacitor, and between the driving capacitor and the electromagnetic repulsion coil. Switch to serial connection and measure. As a result, the charging voltage charged in the driving capacitor can be monitored, and even when the voltage is measured by connecting the driving capacitor and the electromagnetic repulsion coil in series, the impedance of the voltage detection sensor is less than the impedance of the electromagnetic repulsion coil. Because it is large, the charging voltage charged in the driving capacitor can be measured if there is no disconnection of the electromagnetic repulsion coil and the wiring circuit. Can be diagnosed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit configuration diagram for monitoring the presence or absence of an abnormality in an electromagnetic repulsion circuit according to an embodiment of the present invention.
In FIG. 1, the driving capacitor 12 of the electromagnetic repulsion circuit 10 (FIGS. 2 and 3) is charged to a predetermined voltage by the charging device 11, and when a short circuit accident occurs on the load side line, as described above. When the repulsion switch 13 is closed by the shut-off command from the detection control circuit 8 shown in FIG. 2, a discharge current flows from the driving capacitor 12 to the electromagnetic repulsion coil 3, and a repulsive force is generated between the shorting plate 14 and the vacuum valve. The movable main contact 1a of the second main contact 1 is driven and opened.
In the embodiment of the present invention, a voltage detection sensor 15 is connected to the electromagnetic repulsion circuit 10 via the changeover switch 16 as shown in FIG. A state in which a DC high-speed vacuum circuit breaker is provided on the line of the DC power supply 5 (FIG. 2), the vacuum circuit breaker 4 is closed and energized, the repulsion switch 13 is opened, and the electromagnetic repulsion circuit 10 is not operating. When the changeover switch 16 is connected to the terminal on the A side, the voltage detection sensor 15 is connected in parallel with the driving capacitor 12, and the charging voltage of the driving capacitor 12 is measured and the value is set as a predetermined value, that is, the charging voltage. Whether it is a normal value can be monitored.
[0008]
Here, even when the changeover switch 16 is switched and connected to the terminal on the B side connected to the electromagnetic repulsion coil 3, the internal impedance of the voltage detection sensor 15 is larger than that of the electromagnetic repulsion coil 3, so that the drive capacitor 12 is charged. The voltage can be measured. However, if the electromagnetic repulsion coil 3 and the wiring of the electromagnetic repulsion circuit 10 are disconnected, the voltage is not detected. Therefore, it is possible to detect an abnormality in the circuit such as the disconnection of the electromagnetic repulsion circuit 10 based on whether or not this voltage is detected. .
This method of monitoring the electromagnetic repulsion circuit can always perform diagnostic monitoring without affecting the operation of the DC high speed vacuum circuit breaker connected to the line.
[0009]
【The invention's effect】
As described above, in the present invention, a voltage detection sensor is connected in series between the driving capacitor and the electromagnetic repulsion coil, and the presence or absence of detection of the charging voltage of the driving capacitor flowing through the electromagnetic repulsion coil is measured. The electromagnetic repulsion circuit and wiring can be monitored easily for normality and abnormality. In addition, according to the present invention, the electromagnetic repulsion circuit can be monitored without affecting the operation of the DC high-speed vacuum circuit breaker connected to the line by providing the monitoring circuit having the simple circuit configuration described above. A reliable DC high-speed vacuum circuit breaker that can be carried out at any time and is easy to maintain can be obtained.
[Brief description of the drawings]
FIG. 1 is a circuit configuration diagram for monitoring the presence or absence of abnormality in an electromagnetic repulsion circuit according to an embodiment of the present invention.
FIG. 2 is a circuit configuration diagram of a DC high-speed vacuum circuit breaker that is an object of the present invention.
FIG. 3 is a configuration diagram of an electromagnetic repulsion circuit that drives a conventional vacuum valve to open.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main contact 2 Vacuum valve 3 Electromagnetic repulsion coil 4 Vacuum circuit breaker 5 DC power supply 6 Commutation circuit 10 Electromagnetic repulsion circuit 11 Charging device 12 Capacitor for driving 13 Repulsion switch 14 Short-circuit plate 15 Voltage detection sensor 16 Changeover switch

Claims (1)

A vacuum valve with a built-in main contact and the movable main contact of this vacuum valve are caused to generate an electromagnetic repulsive force by passing the current from the driving capacitor charged by the power supply when shut off to the electromagnetic repulsion coil by the repulsion switch. In a DC high-speed vacuum circuit breaker equipped with an electromagnetic repulsion circuit that opens at high speed, the charging voltage of the driving capacitor flowing through the electromagnetic repulsion coil is connected to the driving capacitor in parallel with the voltage detection sensor. It was equipped with a monitoring function to determine that the electromagnetic repulsion circuit is normal when a predetermined value is detected in each case by switching and connecting in series between the capacitor and the electromagnetic repulsion coil. DC high-speed vacuum circuit breaker characterized.

Images