JPH0620565A - Method for inspecting power circuit breaker - Google Patents

Abstract

PURPOSE:To make it possible to inspect the mechanical parts of the control mechanism of a power circuit breaker or the like during operation. CONSTITUTION:A power circuit breaker 1 has a high-speed reclosing function. A measuring portion 2 which, when the circuit breaker 1 operates to open or close a circuit, measures the operating time of the breaker 1 in each case, a judging portion 3 which prestores upper and lower limits related to whether or not the opening and closing operations of the circuit breaker 1 are performed well and compares the values with those measured by the measuring portion 2 to determine whether or not the operations are performed well, and a display portion 4 for displaying the result of this determination are organically connected to one another. In order to inspect the circuit breaker 1, an operation indicating device 5 for sending a command to reclose the circuit at high speed following a command to open the circuit is prepared outside the circuit breaker 1 and is organically connected to the circuit breaker 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of inspecting a power circuit breaker (hereinafter called circuit breaker) during operation.

[0002]

2. Description of the Related Art A circuit breaker connects and disconnects an electric circuit. In particular, when an accident occurs in the circuit, the circuit breaker receives a signal from a protective relay or the like to reliably disconnect the circuit (hereinafter referred to as trip). That is, it plays an important role in the reliability of power supply. Therefore, the user of the circuit breaker
Although the power supply to the electric circuit is systematically stopped and the inspection is mainly performed on the protective relays and the operation mechanism, it is difficult to stop the power supply during the summer when the demand for electricity is high, and at such times This is because a user who wants to minimize the ripples in the event of an accident, and who wants to inspect important equipment such as circuit breakers more than usual to confirm reliable operation. There was a strong desire. Against this background,
Low voltage electrical systems such as control circuits for protective relays or circuit breakers have been duplicated, and measures have been taken to give them a continuous monitoring function by making full use of microelectronics technology, but regarding mechanical parts such as operating mechanisms. In the current technology, it is necessary to operate the operating mechanism to judge whether it is good or bad, and because of the protection function at the time of the above accident, it is not possible to perform an inspection accompanied by operation while the electric circuit is energized. When operating due to reasons or accidents, methods such as automatically measuring characteristics such as operating time and evaluating performance are adopted. Although such a circuit breaker inspection method is expected to have a considerable effect when the circuit breaker is used for an application that operates extremely frequently, the circuit breaker used in a general electric power system has a chance of operating. Very few and more effective methods were desired.

[0003]

DISCLOSURE OF THE INVENTION The present invention makes it possible to inspect mechanical parts such as an operating mechanism during operation in order to ensure more reliable trips in the event of an accident, which is an important role of a circuit breaker. Is what you are trying to do. As already mentioned, inspection of the mechanical parts of the circuit breaker requires the circuit breaker to be opened and closed, but the present invention provides the opportunity for this circuit to be opened and closed at high speed. It is something that one tries to obtain. In recent years, toward the information society, computer systems have spread rapidly, and an instantaneous voltage drop (hereinafter referred to as an instantaneous voltage drop), which was not considered a problem, has caused serious damage such as memory loss. Measures have been vigorously studied by the power supply side and the customer side. At present, an uninterruptible power supply device that compensates for a voltage sag on the consumer side has been recognized as indispensable for an important power source and is widely used, and the voltage sag is no longer considered a problem. In consideration of such a background, the present invention is based on the premise that "a momentary drop in power supply is harmless".

[0004]

The circuit breaker to which the present invention is applied has a high-speed reclosing function, and when the circuit breaker opens or closes, the operating time of each is automatically measured. In addition, it is provided with a device for comparing the predetermined upper limit value or lower limit value of each operation time with the measured value to judge the quality of each operation.

[0005]

According to the present invention, it is possible to inspect mechanical parts such as an operating mechanism of a circuit breaker, which has been difficult without a power failure, in a state of being "energized" in terms of power supply.

[0006]

EXAMPLES Next, examples of the present invention will be described. Figure 1
In one embodiment of the functional configuration of a circuit breaker that enables inspection according to the present invention, the circuit breaker 1 having a high-speed reclosing function measures the opening and closing operation times each time the operation is performed and stores each measured value. And the determination unit 3 that stores the upper limit value and the lower limit value of the operating time of each of the open circuit and the closed circuit in advance and compares the stored value with the measured value to determine whether the operation is good or bad.
And a display unit 4 for displaying the determination result.
In addition to this, an operation instruction device 5 for giving an open circuit and high-speed reclosing command to the circuit breaker 1 for inspection is prepared separately from the circuit breaker 1, and the user of the circuit breaker 1 issues the command at the time. Is configured to be arbitrarily determined. Figure 2
In another embodiment of the functional configuration according to the present invention, the circuit breaker 1 is provided with only the measuring unit 2, and the judgment units 3 and the display unit 4 of a plurality of circuit breakers are collectively provided separately from the circuit breaker. Therefore, the operation instruction device 5 for inspection is also configured by one for each of the plurality of circuit breakers. FIG. 3 is a flow chart according to an embodiment of the present invention. When a circuit breaker is given an open circuit and a high-speed reclosing command at a time determined by a user of the circuit breaker, the circuit breaker operates to open and close the circuit respectively. Do it once. At this time, each operation time is measured and stored in the measuring unit. Next, the determination unit compares the upper limit value and the lower limit value of each operation time stored in advance with the measured value to determine the quality of each operation, and the result is displayed on the display unit.

[0007]

According to the present invention, inspection of mechanical parts such as the operating mechanism of a circuit breaker, which has been difficult until now without a power failure, can be performed.
It becomes possible to carry out the operation including the related control circuit in a state where it is energized, and it is possible to confirm in advance that the trip, which is an important function of the circuit breaker, is surely performed.

[Brief description of drawings]

FIG. 1 is a functional configuration diagram showing an embodiment of a circuit breaker that enables inspection according to the present invention.

FIG. 2 is a functional configuration diagram showing another embodiment of the present invention.

FIG. 3 is a flow chart according to one embodiment of the present invention.

[Explanation of symbols]

 1 Power breaker with high-speed reclosing function 2 Measuring part 3 Judgment part 4 Display part 5 Operation instruction device for inspection

Claims (1)

[Claims] 1. A measuring unit measures each operating time when an electric circuit breaker is opened or closed, and determines each operating time measured by this measuring unit and a predetermined set value. In the method for judging the quality of the operation of the circuit breaker as compared with each other, the circuit breaker is provided with a high-speed reclosing function, and the circuit breaker is opened and high-speed reclosed during operation. A method for inspecting a power circuit breaker, characterized by determining the quality of operation of a circuit breaker.