JP2594030Y2 - Gas circuit breaker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a gas circuit breaker.

[0002]

2. Description of the Related Art Conventionally, an open circuit operation of a gas circuit breaker is necessary to cut off all short-circuit currents caused by a power system accident, small currents caused by power system operation such as circuit switching, and load currents. It was performed at the open circuit speed.
Generally, in a gas circuit breaker, a breaker terminal accident (10
0% BTF) and 75,90% short-distance line failure (7
(5, 90% SLF) Since the open circuit speed required for interruption is the highest, the open circuit speed was used as the open circuit speed of the gas circuit breaker. Therefore, the opening speed of the gas circuit breaker is 10
Excessive opening speed was obtained for current interruption other than 0% BTF and 75, 90% SLF. In addition, gas circuit breakers installed in electric power systems hardly interrupt short-circuit currents that occur in the event of an accident in the electric power system, and in most cases interrupt the load current and small current required for operation of the electric power system. . Furthermore, even in the case of a power system accident, 100% BTF and 75,90% SLF (accidents exceeding 60% of the rated breaking current value) are rare, and most of the accidents are 60% or less of the rated breaking current. As a result, at the opening speed that may not be considered necessary for the gas circuit breaker, the opening speed was excessively higher than the normally required opening speed, and thus the configuration of the gas circuit breaker that is generated by the normally required opening operation An impact load exceeding the impact load applied to the part was generated.

[0003]

[Problems to be Solved by the Invention] In a gas circuit breaker installed in an electric power system, a load current interruption, a small current interruption, and a current interruption with a short-circuit current of 60% or less of the rated value, which account for most of the number of open circuits, are limited. , The opening speed is too high. As a result, in order to obtain the number of times of opening and closing required for the gas circuit breaker, the strength of the components constituting the gas circuit breaker is made to withstand the impact load generated by the opening operation that is excessive with respect to the normal opening operation described above. There was a problem that had to be. Therefore, the present invention is intended to increase the number of times the gas circuit breaker is opened and closed.

[0004]

A gas circuit breaker is provided for judging the current flowing through the electric power system in three stages below the rated current, below 60% of the rated short-time current, and the other three stages. When the current flowing through the power system is less than or equal to the rated current of the power system, the circuit has the slowest open circuit speed. %, The circuit is opened at the fastest opening speed.

[0005]

In the gas circuit breaker of the present invention constructed as described above, the opening speed at the time of the normal opening operation is reduced, so that the impact load applied to the gas circuit breaker components at the time of the opening operation is reduced. In addition, even in the event of an accident, most of the time the circuit is opened at a slower opening speed than in the past, so that the impact load applied to the gas circuit breaker components during the opening operation is reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. 1, 2 and 3. FIG. FIG. 1 shows an example of a configuration according to the present invention, which includes a determination unit 2 that determines the magnitude of a current flowing through a power system 1 and a gas circuit breaker main body 3 that is opened and closed according to a command issued from the determination unit 2. Have been.

That is, as shown in FIG. 2, the judging section 2 judges whether or not the magnitude of the current flowing through the power system 1 exceeds the rated current of the power system 1. An opening command is given to the gas circuit breaker main body 3, and the gas circuit breaker main body 3 is opened at the slowest opening speed a as shown in FIG. When the determining unit 2 determines that the rated current is exceeded, the determining unit 2 further determines whether or not the current exceeds 60% of the rated short-time current. An opening command is given to the circuit breaker body 3, and the gas circuit breaker body 3 is opened at an intermediate opening speed b as shown in FIG.

Further, when the judging section 2 judges that the current exceeds 60% of the rated short-time current, an open command is given to the gas circuit breaker main body 3, and the gas circuit breaker main body 3 is moved to the highest position as shown in FIG. Opening operation is performed at a high opening speed c.

[0009]

According to the present invention, the number of switching operations is increased by using the components of the gas circuit breaker of the prior art, and the strength of the components constituting the gas circuit breaker can be reduced. The size can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment according to the present invention.

FIG. 2 is a flowchart according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a relationship between a current and an opening speed according to an embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power system 2 Judgment part 3 Gas circuit breaker main body

Claims (1)

(57) [Scope of request for utility model registration] 1. The magnitude of a current flowing in a power system is
A determination unit that determines the rated current of the power system or less, the rated short-time current of 60% or less, and three other levels;
According to the three stages determined by this determination unit, the gas circuit breaker main body is set to the slowest open circuit speed when the current flowing through the power system is equal to or less than the rated current of the power system. %, And a circuit breaker which opens the circuit at the fastest open circuit speed when the current exceeds 60% of the rated short-time current when the current exceeds 60% of the rated short-time current, and cuts off the current flowing through the power system.