JPH0736338U - Gas circuit breaker - Google Patents

Abstract

(57) [Summary] [Purpose] In the gas circuit breaker installed in the power system,
It aims to downsize and reduce noise and vibration while maintaining the necessary number of times of opening and closing. [Structure] The open circuit speed of the gas circuit breaker main body 4 is set in two stages, a high open circuit speed and a slow open circuit speed. A determination unit 2 for determining whether or not the current flowing in the power system to which the gas circuit breaker body 4 is connected exceeds the rated current.
When the determination unit 2 determines that the rated current is exceeded, the gas circuit breaker main body 4 is opened at the high opening speed according to a command from the determination unit 2. When the system switching necessary for the operation of the electric power system is performed, the gas circuit breaker main body 4 is opened at the slow opening speed according to a command from the control room 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gas circuit breaker.

[0002]

[Prior art]

 Conventionally, the opening operation of the gas circuit breaker is to cut off all of these currents in order to cut off short-circuit currents that occur due to power system accidents and small currents and load currents that occur due to power system operation such as power system switching. Among the required circuit breaker opening speeds, the circuit is opened at the maximum speed. Generally, in a gas circuit breaker, the open circuit speed required for circuit breaker terminal obstruction (100% BTF) interruption and 75,90% short-distance line obstruction (75, 90% SLF) interruption is the highest, The open circuit speed is defined as the open circuit speed of the gas circuit breaker. Therefore, the open circuit speed of the gas circuit breaker is an excessive open circuit speed when the current is cut off except when 100% BTF and 75,90% SLF are cut off.

On the other hand, the gas circuit breaker installed in the electric power system hardly interrupts the short-circuit current that occurs when the electric power system fails, and can interrupt the load current and the small current necessary for operating the electric power system. Most are. As a result, the open circuit operation of the gas circuit breaker is performed at an open circuit speed that is too high compared to the normally required circuit open speed, which may be considered to be rarely required. Is occurring.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional gas circuit breaker, the open circuit operation for power system operation such as switching of the power system, which accounts for most of the open circuit times, in other words, excessive for the small current and the load current cutoff. Since the open circuit speed is high, the strength of the components that make up the gas circuit breaker must be adjusted to the impact load generated by an excessive open circuit operation in order to obtain the number of switching times required for the gas circuit breaker installed in the power system. It has to endure. For this reason, the strength is higher than the required parts for the opening speed required for the opening operation for operating the power system, so it is large. In addition, the noise and vibration during the opening operation, which accounts for most of the opening times of the gas circuit breaker, are also large. Therefore, the present invention aims to reduce the size and reduce noise and vibration of a gas circuit breaker installed in a power system while maintaining the required number of switching operations.

[0005]

[Means for Solving the Problems]

 In the gas circuit breaker of the present invention, the open circuit speed of the gas circuit breaker main body is set in two stages, a high open circuit speed and a slow open circuit speed. A judgment unit is provided to judge whether the current flowing in the power system to which the gas circuit breaker body is connected exceeds the rated current. When it is determined by the determination unit that the rated current is exceeded, the gas circuit breaker body is opened at the high opening speed in response to a command from the determination unit. When switching the system necessary for operating the electric power system, the gas circuit breaker body is opened at the slow opening speed according to a command from the control room.

[0006]

[Action]

 In the gas circuit breaker of the present invention described above, the opening speed at the time of the opening operation necessary for the operation of the electric power system, which occupies most of the opening times, becomes slow, so the impact force is reduced, the number of times of opening / closing is increased, or It is possible to reduce the size by reducing the strength of the constituent parts. In addition, noise and vibration during opening operation can be significantly reduced.

[0007]

【Example】

 1 to 3 show an embodiment of the present invention. In FIG. 1, the gas circuit breaker main body 4 connected to the electric power system 1 has an open circuit speed set in two stages. That is, as shown in FIG. 2, the open circuit speed of the gas circuit breaker main body 4 is as follows: a high open circuit speed a capable of 100% BTF cutoff and 75,90% SLF cutoff, and system switching necessary for operation of the power system 1. When performing, that is, the load current and the slow open circuit speed b capable of interrupting a small current are set in two stages.

The determination unit 2 detects the current value flowing in the power system 1 and determines whether or not the current value exceeds the rated current. In this case, when the judgment unit 2 judges that the rated current is exceeded, the judgment unit 2 issues an open circuit command to open the gas circuit breaker main body 4 at a high circuit opening speed a, and the judgment unit 2 determines the rated current. If it is determined that the gas circuit breaker main body 4 is not opened, the determination unit 2 does not issue an open circuit command for the gas circuit breaker body 4. On the other hand, the control room 3 of the substation issues an opening command to open the gas circuit breaker main body 4 at a slow opening speed b when switching the circuits necessary for operating the power system 1.

Next, the operation of the gas circuit breaker of the present invention will be described with reference to FIG. In step 11, the determination unit 2 detects the current value flowing in the electric power system 1, then proceeds to step 12, and the determination unit 2 determines whether or not this current value exceeds the rated current. When it is determined in step 13 that the rated current is not exceeded, the process proceeds to step 14, and the determination unit 2 does not issue a command to open the gas circuit breaker body 4. On the other hand, when it is determined in step 13 that the rated current is exceeded, that is, when the fault current is flowing, the process proceeds to step 15, and the determination unit 2 opens the gas circuit breaker body 4 at a high opening speed a. The open circuit command is issued, and then the routine proceeds to step 16, the gas circuit breaker main body 4 is opened at a high circuit opening speed a, and the routine proceeds to step 17 where the current interruption of the power system 1 is performed.

On the other hand, in step 21, when the system switching necessary for the operation of the power system 1 is performed, the process proceeds to step 22 and the control room 3 opens the gas circuit breaker main body 4 at the slow opening speed b 1. After issuing a command, the process goes to step 23, the gas circuit breaker main body 4 opens at a slow opening speed b, and the process goes to step 17 to cut off the current of the power system 1.

[0011]

[Effect of device]

 According to the present invention, it is possible to increase the number of times of opening and closing by using the components of the conventional gas circuit breaker body, or to reduce the size of the gas circuit breaker body by lowering the strength of the components constituting the gas circuit breaker body. You can

[Brief description of drawings]

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

FIG. 2 is a diagram showing a relationship between an electric current and an open circuit speed according to an embodiment of the present invention.

FIG. 3 is a flowchart according to an embodiment of the present invention.

[Explanation of symbols]

 1 Power system 2 Judgment part 3 Control room 4 Gas circuit breaker body

Claims (1)

[Scope of utility model registration request] 1. An open circuit speed of a gas circuit breaker main body is set in two stages of a high open circuit speed and a slow open circuit speed, and a current flowing in a power system to which the gas circuit breaker main body is connected exceeds a rated current. If a determination unit is provided to determine whether or not the rated current is exceeded, the determination unit issues a command to open the gas circuit breaker body at the high opening speed, A gas circuit breaker, which opens the gas circuit breaker main body at the slow opening speed in response to a command from a control room when performing system switching necessary for operating the power system.