JP2002075145A - Gas-blast circuit breaker with suppressing apparatus for exciting inrush current - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker having a suppressing apparatus for an exciting inrush current, which reduces installation space and cost. SOLUTION: The first gas-blast circuit breakers 1a, 1b comprise grounded tanks which seal insulating gas, fixed and movable contacts disposed in the tanks, and bushings mounted to the tanks and connected to the fixed and the movable contacts. The second gas circuit breaker 1c comprises the grounded tank sealing the insulating gas, the fixed and the movable contacts disposed in the tank, the bushings mounted to the tank and connected to the fixed and the movable contacts. Either of the fixed or the movable contacts is connected to the bushing via an inrush current limiting resistor, and a transformer 15 is supplied with electric power via a parallel circuit of the first and the second gas circuit breakers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker having an exciting rush current suppressing device, and more particularly to a gas circuit breaker having an exciting rush current suppressing device having a small mounting space and a low cost.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 4-112434 discloses a shut-off unit having a shut-off unit and a series connection of a closing contact and a resistor connected in parallel, and a shut-off unit with a shut-off resistor in which the shut-off unit and the series unit are housed in a tank. A vessel is shown. This circuit breaker can suppress the inrush current by selecting the resistance value of the resistor and the advance closing time of the closing contact with respect to the breaking section.

[0003]

In the technique disclosed in the above-mentioned publication, since a breaking part, a closing contact, and a resistor are respectively incorporated in a tank, the tank becomes large and its shape becomes complicated. Further, the mounting space is increased, and the cost is also increased. The present invention has been made in view of the above problems,
Provided is a gas circuit breaker with an inrush current suppression device with a small mounting space and low cost.

[0004]

The present invention employs the following means in order to solve the above-mentioned problems.

A first gas circuit breaker comprising: a grounding tank filled with an insulating gas; fixed and movable contacts disposed in the tank; and a bushing attached to the tank and connected to the fixed and movable contacts, respectively. A grounding tank filled with an insulating gas, a fixed contact and a movable contact arranged in the tank, and a bushing attached to the tank and connected to one of the fixed contact and the movable contact via an inrush current limiting resistor. , And supplies power to the transformer 15 via a parallel circuit of the first gas circuit breaker and the second gas circuit breaker.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a circuit diagram of a gas circuit breaker with an inrush current suppression device according to an embodiment of the present invention,
2 is a top view, FIG. 3 is a side view, and FIG. 4 is a sectional view of a circuit breaker with a resistor. In these figures, 1a and 1b are main circuit breakers, and 2 is a circuit breaker with a resistor. Each of these circuit breakers has a ground tank in which an insulating gas such as SF6 is sealed, and a shut-off portion is sealed in the tank. 3 is a stand on which the main circuit breaker, circuit breaker with resistor, and circuit breaker operating device 4 are mounted, and 4 is an operating device for operating the main circuit breaker and the circuit breaker with resistor in common via a link. Can be. 5 is a bushing attached to the main circuit breaker and the circuit breaker with a resistor, 6 is an upper terminal of the bushing, 7 is a connection line for connecting the main circuit breaker 1b and the circuit breaker with a resistor 2 in parallel, and 8 is a resistor. 9 is a movable contact of the circuit breaker with a resistor, 10 is a contact distance between the fixed contact and the movable contact, 11 is a resistor for suppressing the inrush current of excitation, and 12 is an operation for operating the movable contact. Rods, 13a and 13b are contacts of the main circuit breaker, 13c is a closing contact of the circuit breaker with resistance, 14
Is a grounding tank filled with an insulating gas, and 15 is a single-phase transformer used for feeding power to a train line, and is connected to a power source via the main circuit breaker and a circuit breaker with a resistor.

As shown in FIGS. 1 to 3, the main circuit breaker 1
a and 1b are respectively connected between both terminals of the single-phase transformer 15 and an AC power supply (not shown). A circuit breaker with a resistor 2 is connected in parallel with one of the main circuit breakers. Three grounding tanks accommodating the main circuit breakers 1a and 1b and the breaker of the circuit breaker with resistor 2 are mounted on the gantry 3, and the movable contacts of the respective circuit breakers are commonly driven by the operating device 4.

The main circuit breakers 1a and 1b and the circuit breaker with resistor 2 are connected to the power supply and the single-phase transformer 1 via a bushing 5.
Connect to 5. The main circuit breaker 1b and the circuit breaker with resistor 2 are connected in parallel via the connection line 7.

The main circuit breakers 1a and 1b and the circuit breaker with resistor 2 have substantially the same configuration, but the circuit breaker with resistor 2 has a resistor 11 for suppressing inrush current on the fixed contact side. At the time of the breaker closing operation by the operating device 4, the closing contact 13c of the breaker with resistor 2 is changed to the breaking portion contacts 13a and 1b.
3b, the contact distance between the fixed contact and the movable contact is set to be shorter than that of the main breaker 1 (for example, 10 ms or more).
The stroke length is set shorter than that of a and 1b, and the stroke amount is set shorter.

As described above, by arranging the main circuit breakers 1a and 1b and the circuit breaker 2 with a resistor in parallel, the circuit breakers can be installed in substantially the same area as the conventional three-phase tank type circuit breaker. Further, the breaking performance of the circuit breaker with resistor 2 can be reduced as compared with the main circuit breaker, and the gas pressure of the circuit breaker with resistor 2 can be reduced. can do. In addition, the main circuit breaker 1a,
Since the circuit breaker 1b and the circuit breaker with resistor 2 have substantially the same configuration, a normal circuit breaker for a three-phase circuit in which three circuit breakers are juxtaposed may be used, and one of them may be a circuit breaker with a resistor. it can. In this case, the closing time of the circuit breaker with the resistor can be adjusted by the link mechanism.

[0011]

As described above, according to the present invention, it is possible to provide a gas circuit breaker with an inrush current suppressing device with a small mounting space and a low cost.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a gas circuit breaker with an inrush current suppression device according to an embodiment of the present invention.

FIG. 2 is a top view of the gas circuit breaker with the excitation rush current suppressing device.

FIG. 3 is a side view of a gas circuit breaker with an inrush current suppression device.

FIG. 4 is a sectional view of a resistor circuit breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1a, 1b Main circuit breaker 2 Circuit breaker with resistor 3 Frame 4 Operating device 5 Bushing 6 Upper terminal of bushing 7 Connection line 8 Fixed contact 9 Movable contact 10 Contact distance 11 Resistor for suppressing inrush current of resistor excitation 12 Operating rod 13a, 13b Contact of main breaker 13c Contact of breaker with resistor 14 Ground tank 15 Single-phase transformer

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Daisuke Ebisawa 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture F-term in Hitachi, Ltd. Electric System Works 5G001 AA08 BB03 GG03 5G013 AA01 AA10 BA01 CA05 5G027 AA06 AA26 CA07 5G028 AA08 AA21 FB05 FC02

Claims (5)

[Claims] 1. A first gas cutoff comprising a grounding tank filled with an insulating gas, fixed and movable contacts disposed in the tank, and a bushing attached to the tank and connected to the fixed and movable contacts, respectively. And a grounding tank filled with an insulating gas, fixed and movable contacts disposed in the tank, and attached to the tank and connected to one of the fixed and movable contacts via an inrush current limiting resistor. A second gas circuit breaker comprising a bushing; and a power supply is supplied to the transformer via a parallel circuit of the first gas circuit breaker and the second gas circuit breaker. With gas circuit breaker. 2. The gas shut-off device according to claim 1, wherein the gas pressure of the second gas circuit breaker is lower than the gas pressure of the first gas circuit breaker. vessel. 3. The stroke amount of the movable contact of the second gas circuit breaker according to claim 1, wherein the stroke amount of the movable contact of the second gas circuit breaker is shorter than the stroke amount of the movable contact of the first gas circuit breaker. A gas circuit breaker with an inrush current suppression device. 4. A gas shut-off device with an inrush current suppression device according to claim 1, wherein the gas filled in said second gas circuit breaker is atmospheric pressure at normal pressure. vessel. 5. The gas circuit breaker according to claim 1, wherein the transformer is a single-phase transformer for an electric railway.