JPH036082Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a closed power distribution board, and in particular to an improvement of the power supply busbar room thereof.

(Prior art) In general, a power supply bus introduced into a closed distribution board consists of three phases, which are grouped together in one place with sufficient insulation spacing to provide insulation between the phases, and are surrounded by a grounding bulkhead. They are stored together indoors to ensure safety by preventing foreign objects from entering and preventing short circuit accidents. However, in the busbar room, only a certain insulation interval is provided for each phase.
There is a possibility that a short circuit accident between phases will occur. Furthermore, the power bus is often installed in multiple independent closed switchboards, a so-called column power distribution system. Therefore, if a fault occurs in the power bus of one closed switchboard, the power bus is immediately connected to other closed switchboards. This will affect all closed switchboards in the area, causing a cascading accident. However,
The equipment on the load side of each closed switchboard is protected from accidents because the circuit breakers act to cut off the circuit. Therefore, there has been a strong demand for increasing the reliability of this busbar room, and a means to further reduce the probability of accidents has been required.

(Purpose of the invention) In view of the above circumstances, the present invention aims to reduce the probability of accidents in the busbar room and provide a highly reliable closed switchboard.

(Summary of the invention) Based on the above-mentioned purpose, the present invention includes a grounding partition wall that separates each power bus bar into each phase in the bus bar room, each connecting conductor connected to each power bus bar, and each disconnecting part bushing. It was constructed by defining a grounding partition wall that separates each phase. With this configuration, the power supply bus bar side is surrounded by a grounding partition wall for each phase, and the probability of occurrence of an inter-phase short circuit accident is greatly reduced.

(Example) An example of the present invention will be described below based on the drawings.

FIG. 1 is a side sectional view of the closed switchboard, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. 1. 1 is a housing, 2 is a door, 3 is a breakout switch, 4 is a control circuit section, 5 is a vertical bulkhead, 6 is a load bus room, 7 is a load bus, and 8 is an L-shaped cross section that defines a bus room 9. This is a grounding bulkhead. The busbar chamber 9 is surrounded by the ground partition wall 8, the vertical partition wall 5, and the housing 1, and three-phase power busbars 10 are introduced in parallel at regular intervals above the busbar chamber 9. The power supply bus 10 is disposed so as to penetrate from one side wall of the housing 1 to the other side wall. Reference numeral 11 denotes an insulator that insulates and supports the power supply bus 10 on the housing 1 . 12 is a disconnector bushing on the power supply side, and 13 is a connecting conductor. 14,14a,1
5, 16, and 16a are grounding partitions, respectively. The grounding partitions 14 and 14a vertically divide the three-phase power supply bus 10 into each phase, and the grounding partition 15 separates the power supply bus 10 and the disconnection bushing 12 in the horizontal direction. The grounding bulkheads 16, 16a are connected to each disconnecting section bushing 12.
are vertically divided to define busbar chambers 9, respectively. Reference numeral 17 denotes an insulating support, which is supported by the ground partition wall 15 and has the connecting conductor 13 inserted therethrough. Reference numeral 18 designates a disconnecting section bushing on the load side, 19 a conductor connecting the disconnecting section bushing 18 and the load bus 7, 20 a current transformer, 21 a grounding device, and 22 an operating section of the grounding device 21.

Thus, each power supply busbar 10 is connected to a ground bulkhead 1.
4, 14a, and 15, while the disconnecting section bushing 12 and the connecting conductor 13 are individually surrounded by the grounding partition walls 15, 16, and 16a. Therefore, each power supply bus 10 is completely independent for each phase,
Because they are separated without causing short-circuit accidents,
It is highly safe and reliable, and the probability of accidents is definitely reduced.

In addition, although the power supply bus room 9 is subdivided in this way,
Since there is almost no need for maintenance and inspection of the power supply bus 10, many ground bulkheads 14, 14a, 15, 16,
Even if 16a is provided, no problem will occur.

(Effect of the invention) According to the invention described above, the power supply bus room 9
are grounded partition walls 14, 14a, 15, 16, 1 for each phase.
6a, each power supply bus 10, a connection conductor 13 conducting thereto, and a disconnection bushing 12.
Since each phase is surrounded independently, short-circuit accidents between phases are prevented, and the probability of short-circuit accidents is reduced and reliability is improved. 16 and 16a have the effect of preventing only ground faults.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a closed switchboard according to the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. 1. 9... Bus bar room, 10... Power bus bar, 12... Disconnection section bushing, 13... Connection conductor, 14, 14
a, 15, 16, 16a...Earth bulkhead.

Claims (1)

[Scope of utility model registration request] In a closed switchboard equipped with a bus room surrounding a three-phase power bus, the bus room includes a vertical grounding partition that divides the power bus into each phase, and a grounding partition that divides the bus room into two upper and lower stages. , each connecting conductor connected to the power supply bus bar and a vertical grounding bulkhead dividing the disconnection part bushing into each phase;
A closed switchboard characterized by having a busbar room divided into phases.