JPH02246708A - Earth test truck for switchboard - Google Patents

Abstract

PURPOSE:To simplify the structure and to keep sufficient insulating spatial distance by providing terminals at each front end of contact bars and by providing an earth conductor and a locking device in a compartment in downward front of a lower contact conductor room. CONSTITUTION:In upper and lower contact conductor rooms 6a and 6b are fixed contact bars 12a and 12b for each phase through fittings 10a and 10b and insulators 11a and 11b. At the front end of the contact bar 12a are provided terminals 13a and 13b with small holes bored, while contactors 14a and 14b are provided at the rear end projecting from openings 9a and 9b. In a compartment 15 defined by partition boards 4a and 4b a locking device 16 composed of a lock pin 16a and a lever 16b and an earth conductor 17 fitted with a fitting 10c are provided. A sliding body 18 that slides on an earth rail is connected to the earth conductor 17. An end of earth cable 19 for each phase is fitted to the earth conductor 17, while the other end is fitted to the terminal 13a or 13b of bars 12a and 12b with a bolt 19b.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a power distribution board suitable for performing grounding and high voltage tests, etc. of a power distribution board, especially a high voltage closed power distribution board equipped with a small vacuum circuit breaker. Regarding earth test trolley.

[Conventional technology]

Some conventional grounding devices operate a dedicated handle provided on the front side of the switchboard to operate a grounding device provided in a compartment on the rear side of the switchboard.

Further, there is known a device using a grounding test cart without providing a grounding device in the switchboard, for example, as disclosed in Japanese Utility Model Application No. 63-33312. Here, the trolley is equipped with a lifting platform that is raised and lowered by a handle-operated hoist, and a ground conductor with a contact is attached to this elevator platform, and the trolley is raised and lowered by the handle operation to the height of the bus bar and the height of the load circuit. It is shown.

(Problem to be solved by the invention) There are two types of closing operation methods for vacuum circuit breakers: electromagnetic type and electric spring type.
The former is often used for small capacity circuit breakers. A switchboard housing such a vacuum circuit breaker usually has the circuit breakers stacked in two tiers to effectively utilize the installation floor space.

In such a compact switchboard, among the conventional techniques mentioned above, the one that assembles a grounding device to the switchboard requires not only the grounding device but also an interlock mechanism between the grounding device and the circuit breaker for safety reasons. An interlock mechanism for the circuit breaker is also required, resulting in a problem that the power distribution board becomes large.

Further, the above-mentioned ground test cart equipped with a lifting platform requires a lifting platform, a hoist, etc., and there is a problem in that it is difficult to make it compact so that it can be stored in a small circuit breaker room.

SUMMARY OF THE INVENTION An object of the present invention is to provide a grounding test cart for a power distribution board that is simple in operation and structure, and can be stored in a small circuit breaker room.

[Means to solve the problem]

The earthing test trolley for a switchboard according to the present invention is a trolley equipped with wheels, and has upper and lower contact conductor chambers which are partitioned into upper and lower sections and have doors made of insulating material on the front. and a contact bar for the load circuit are fixed, and the front end of each contact bar is provided with a terminal to which a grounding cable can be detachably attached, and the rear end is protruded from the opening on the back of the contact conductor chamber to connect the contact bar for the bus bar. and a contactor for the load circuit, a compartment is formed at the lower front part of the lower contact conductor chamber separated by a partition plate, and this compartment is equipped with a locking device for fixing the trolley and a sliding body for grounding. A grounding conductor is provided, and the grounding cables of each phase connected to the grounding conductor can be selectively attached to the terminals of the contact bar for the bus bar or for the load circuit.

[Effect]

The grounding cables of each phase connected to the grounding conductor can be connected to a terminal such as a small hole provided at the front end of the contact bar by selecting either one for the bus bar or for the load circuit, and the structure is simple. Since the grounding groove/body with the grounding slide and the locking device are provided in the lower front compartment of the lower contact conductor chamber, the rear side thereof can be used for the lower contact conductor chamber. Therefore, originally
Even if the breaker chamber is small and the contactor for the load circuit is located low, the contact bar can be bent into a crank shape to ensure a sufficient insulating space distance within the contact conductor chamber.

[Example] FIG. 1 is a cross-sectional view conceptually showing a vertical section of an example, showing the I-1 cross section in FIG. 2, FIG. 2 is a front view of FIG. 1, and FIG. FIG. 2 is a partially transparent top view of FIG. 1;

Above the underframe 2 equipped with wheels l are upper and lower contact conductor chambers 6a consisting of ceiling plates 3a, 3b, partition plates 4a, 4b and side plates 5.
, 6b are divided into upper and lower sections by a ceiling plate 3b. Doors 7a and 7b made of insulating material are attached to the front surfaces of the contact conductor chambers 6a and 6b with hinges 8a and 8b, and can be fixed with bolts 8c and 8d with low lefts, and the back surfaces have openings 9a and 9b.
It becomes. The ceiling plates 3a, 3b, etc. are each made up of shallowly mounted boxes as shown in the figure. Handles 8e, 8f, a caution plate 8g, etc. are attached to the front of the trolley.

There are metal fittings 10 in the upper and lower contact conductor chambers 6a and 6b.
a, 10b and the contact bar 12 via the insulators 11a, Ilb.
aS 12b is fixed at each phase.

The front end of the contact bar 12a has terminals 13a, 1 with small holes.
3b, and contacts 14aS and 14b are provided at the rear end thereof protruding from the openings 9a and 9b. This contact 14
(14a, 14b) are connected to the busbar contacts and load circuit contacts on the panel side by pushing this earth test cart into the circuit breaker chamber of the switchboard.

A compartment 15 partitioned by partition plates 4a, 4b is located at the lower front of the lower contact conductor chamber 6b for the load circuit. Inside this compartment 15, there is a locking device I6 consisting of a lock bin 16a and a lever 16b for locking the trolley in the circuit breaker room, and a grounding conductor 1 attached with a metal fitting 10c.
7 is provided, and a sliding body 18 that slides on a ground rail (not shown) on the panel side is connected to the ground conductor 17 by a flexible conductor.

One end of the grounding cable 19 of each phase is attached to the grounding conductor 17 with a bolt 19a, and the other end is attached to the contact bar 12a.
, 12b selectively connects the bolt 19 to the terminal 13a or 13b.
It can be detachably attached with b.

Of the above structure, parts of a circuit breaker may be used for the wheels 1, the underframe 2, the lock device 16, the ceiling plate 3a, the side plates 5, etc.

To ground the load circuit, open the door 8b, make sure the door 8a is closed, connect the grounding cable 19 to the terminal 13b of the contact bar 12b on the load side, and then push the trolley into the circuit breaker chamber. , locked with a locking device. The withstand voltage test on the load circuit side is performed by removing the grounding cable 19 and applying a high voltage between the cable terminal on the switchboard side and the contact bar 12b.

The contact bar 12a is used for grounding on the busbar side and for pressure testing.
Proceed as above.

〔Effect of the invention〕

The earthing test trolley for a switchboard according to the present invention is a trolley equipped with wheels, and has upper and lower contact conductor chambers which are partitioned into upper and lower sections and have doors made of insulating material on the front. A contact bar for the load circuit and a contact bar for the load circuit are fixed, and a terminal for detachably attaching a grounding cable is provided at the front end of each contact bar. A compartment is partitioned off with a partition plate at the lower front part of the lower contact conductor chamber, and a locking device for fixing the trolley and a sliding body for grounding are installed in this compartment. A grounding conductor is provided, and the grounding cables for each phase connected to the grounding conductor can be selectively attached to the terminals of the contact bar for the bus bar or for the load circuit. , The structure for switching between grounding on the busbar side and grounding on the load circuit side in the grounding test trolley is simple and can be made compact, and can be used in small switchboards with electromagnetic two-tier circuit breakers. This also has the effect that the switchboard does not become large and the structure becomes simpler.

[Brief explanation of drawings]

FIG. 1 is a sectional view conceptually showing a longitudinal section of the embodiment, and shows the II cross section in FIG. 2, FIG. 2 is a front view of FIG. 1, and FIG. FIG. 3 is a partially transparent top view of the figure. 4a, 4b...Partition plate, 6a, 6b...Contact conductor chamber, 7a, 7b...Door, 9a, 9b-opening, l
la. 1 l b-・Insulator, 12a, 12b・”Contact bar
13a. 13b...Terminal, 17...Grounding conductor, 19...Grounding cable 12a Dust-Ka Figure 1 Figure 2m 31! !

Claims (1)

[Claims] 1) A trolley equipped with wheels has upper and lower contact conductor chambers which are partitioned into upper and lower sections and have doors made of insulating material on the front. A contact bar and a contact bar for the load circuit are fixed, and a terminal for detachably attaching a grounding cable is provided at the front end of each contact bar, and the rear end is made to protrude from the opening on the back side of the contact conductor chamber to connect the terminal for the bus bar and the load circuit. A contactor for the load circuit is attached, a compartment is formed at the lower front part of the lower contact conductor chamber separated by a partition plate, and this compartment is equipped with a locking device for fixing the trolley and a sliding body for grounding. a grounding conductor, and the grounding cable for each phase connected to the grounding conductor can be selectively attached to the terminal of the contact bar for the bus bar or for the load circuit. Ground test trolley.