RU12872U1 - LOW-VOLTAGE DISTRIBUTION DEVICE - Google Patents

Abstract

A low voltage switchgear comprising a cabinet in which an input switch with a shaft of contact knives is connected, connected by conductors to linear machines, outgoing busbars, a grounding device, characterized in that the grounding device is made in the form of a shaft rotating in bearings with incoming contacts that are closed with additionally introduced receiving contacts, mounted on the tires of the outgoing lines, and the shaft of the grounding device is mechanically connected with a shaft of contact knives and input, while in the disconnected position of the latter, the incoming contacts of the grounding device are closed with the receiving contacts on the buses of the outgoing lines.

Description

LOW VOLTAGE DISTRIBUTION DEVICE

The utility model relates to electrical engineering and can be used in low voltage switchgears designed to distribute electricity to consumers, in particular in complete cabinet, mast and pole transformer substations.

Known low voltage switchgears (hereinafter referred to as LVHF) containing a metal sheath (a cabinet in which electrical apparatuses are mounted: an input switch connected by busbars to circuit breakers of the outgoing lines to consumers (L1).

The disadvantage of operating such RUNNs is the need for carrying out maintenance and repair work of applying portable grounding to each line that goes to the consumer.

Also known RUNN, in design similar to those described above, which additionally contain a grounding device. It consists of lamella contacts, electrically connected No. Тх to the grounded metal shell of the RUNN and located directly at the input breaker.

When disconnecting the input circuit breaker, its contact knives enter the lamellas (contacts) of the grounding device, grounding current-carrying circuits of the RUNN after the input circuit breaker, incl. outgoing lines to the consumer.

The disadvantage of these RUSHs is that the grounding of the lines going to the consumer occurs through electrical devices (linear circuit breakers) and contact connections of current-carrying circuits of the RUNN, which does not ensure full

MSHSb HOIH - 2 is a grounding guarantee, and when replacing (or malfunctioning) these electrical devices, a ground circuit is removed from the jiHKHf.

The objective of this utility model is to create a low voltage switchgear that provides reliable grounding of the low voltage switchgear lines going to the consumer, obtained when the input switch is turned off.

The solution to this problem is achieved by the fact that in the well-known RUNN containing a cabinet | in which an input switch with a shaft of contact knives is located, connected by conductors with linear automatic machines, outgoing busbars and an earthing device, the specified earthing device is designed as rotating in bearings a shaft with incoming contacts, closed with additional input contacts, fixed on the tires of the outgoing lines, and the shaft of the grounding device is mechanically connected to the shaft of the contact knives of the knife switch ode, while in the disconnected position of the latter, the incoming contacts of the grounding device are closed with the receiving contacts on the buses of the outgoing lines.

On the . I shows a part of the RUNN with a grounding device in the disconnected position of the contact knives of the input switch; on game 2 - section AA. The dashed lines on both show the on position of the contact knives of the input switch and the off position of the grounding device.

RUNN contains a metal shell (cabinet ($) I, in which there is an input switch 2 with a shaft 3 of contact knives, linear circuit breakers 4 connected to the switch 2 by conductors 5, bus outgoing lines b with receiving contacts 7 and a grounding device 8.

The grounding device 8 is made in the form of a shaft 10 rotating in bearings 9, with electrically fixed on it and

mechanically entering them with contacts II made, for example, in the form of lamellar contacts welded to the shaft. The shaft 10 of the grounding device with a T2 thrust is mechanically connected. It is connected to the shaft 3 of the contact knives of the input switch 2 by a conventional lever gear, and the flexible conductor 13 is connected to a grounded metal sheath (cabinet (| ohms) I RUNN, providing reliable electrical contact. Shaft Yu and Incoming contacts TI are located from the current-carrying parts at the required insulation distance, determined by the nominal voltage H / IiH.

The buses of the outgoing lines b are fixed to the terminals of the linear circuit breakers 4 and insulating pads 14. On the tires of the outgoing lines b are fixed the contact: 7, very small, for example, in the form of lamella contacts.

When turning off the input bilnik 2 o. simultaneously, the incoming contacts 11 of the grounding device 8 overlap with the receiving contacts 7 on the rniinax of the outgoing lines b, providing a reliable electrical connection of the outgoing lines with a grounded metal shell (cabinet) I RUNN.

When the input breaker 2 is turned on, the simultaneously incoming TI contacts of the grounding device 8 are opened with the receiving contacts 7 on the buses of the outgoing lines b, providing an isolation distance between the receiving and input contacts, determined by the value of the rated voltage of the low voltage switchgear.

The proposed grounding device ensures compliance with safety requirements in a simple manner and reliably, without additional personnel operations.

 3) ULA USEFUL MODEL

A low-voltage switchgear containing a cabinet (|, in which an input switch with a contact shaft is located, connected by conductors with linear circuit breakers, an outgoing busbar, an earthing device, characterized in that the earthing device is made in the form of a shaft rotating in bearings with incoming contacts that are closed with additional introductions by receiving contacts mounted on the tires of the outgoing lines, and the shaft of the grounding device is mechanically connected by a thrust to the shaft of the contact knives Single input, wherein in the open position posledaego incoming contacts are closed with a grounding device priemnshi contacts on outgoing lines tire.

Sources of information:

1. Technical description HBEM.W822,049 0 Transformer substations with a power of 25-250 kVA and a voltage of b-TO kV.

METZ G. Minsk, 1996

2. Technical description SHEZH.674821.014 TO Podstash and transformer mast 10 / 0.4 kV with a power of 25-250 kVA

Closed Joint Stock Company Velikiye Luki, 1995

Claims (1)

A low-voltage switchgear comprising a cabinet in which an input switch with a shaft of contact knives is connected, connected by conductors to linear automata, outgoing busbars, a grounding device, characterized in that the grounding device is made in the form of a shaft rotating in bearings with incoming contacts that are closed with additionally introduced receiving contacts, mounted on the tires of the outgoing lines, and the shaft of the grounding device is mechanically connected with a shaft of contact knives and input, while in the disconnected position of the latter, the incoming contacts of the grounding device are closed with the receiving contacts on the buses of the outgoing lines.