RU27275U1 - LOW-VOLTAGE COMPLETE DEVICE INPUT CABINET - Google Patents

Description

LOW VOLTAGE INPUT CABINET

The utility model relates to the field of electric power and can be used as an input cabinet for a low-voltage package device (GCC) of the auxiliary needs system of power plants in which the mechanisms are driven by reversible and non-reversible three-phase asynchronous motors.

The NKU input cabinet is known, it contains a working and backup power supply, a set of switching equipment: a switch, a circuit breaker and power supply buses 1. This cabinet is widely used in auxiliary systems of power plants and substations due to the simplicity of design and layout. In addition, consumers connected to the cabinet are provided with guaranteed power. However, this cabinet does not provide measures to limit the starting currents of the motors.

The closest in technical dryness to the claimed utility model is the input cabinet of the low-voltage switchgear of the electric drive, containing conclusions for connecting the network, a set of switching equipment, reactors installed in each phase of the motor power supply and conclusions for connecting the motor 2. This cabinet is widely used for starting powerful motors, since in it starting currents are limited to phase linear reactors, however, only one input channel is made in it, which reduces the reliability of the cabinet.

The technical result of the utility model is to increase the reliability of the input cabinet and expand its functionality.

This technical result is achieved by the fact that the input cabinet of the low-voltage complete device, containing in the input channel series-connected terminals for connecting the network, the first circuit breaker, the first starter, the first reactor, the second

DEVICES

the circuit breaker and the terminals for connecting the motor are provided with an additional input channel containing series-connected other terminals for connecting the network, a third circuit breaker, a second starter, a second reactor, a fourth circuit breaker and other terminals for connecting the motor, while these channels are connected by a jumper installed between the inputs of the first and second reactors, and in each of the channels, the conclusions for connecting the network and the conclusions for connecting the engine are made in the form of buses.

The drawing shows a circuit diagram of the input cabinet NKU, made in a single-line design.

The device comprises a main input channel 1 and an additional input channel 2, while in the main channel, terminals 3 for connecting the network, made in the form of buses, a first circuit breaker 4, a first starter 5, a first reactor 6, a second circuit breaker 7 and terminals 8 are connected in series for connecting the engine, made in the form of tires, and in the additional input channel 2, other terminals 9 for connecting the network are connected in series, the third circuit breaker 10, the second starter 11, the second reactor 12, the fourth automatic A circuit breaker 13 and other terminals 14 for connecting the engine, made in the form of tires. A jumper 15 is installed between the main input channel 1 and the additional input channel 2, which is installed between the inputs of the reactors 6 and 12. The execution of pins 3 and 9 for connecting the network and pins 8 and 14 for connecting the motor in the form of buses allows increasing the number of connected channels and the number of powered motors , which greatly expands the functionality of the cabinet, and the installation of a jumper between input channels 1 and 2 increases the reliability of the cabinet, as motors powered by buses 8 and 14 will rotate regardless of the correctness of automatic shutdowns 4 and 10 and starters 5 and 11.

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Cabinet input NKU works as follows. In a static state in the absence of mains voltage on buses 3 and 9 of input channels 1 and

2 the voltage will also be absent, all circuit element 4 circuit breakers 4 and 10, starters 5 and 11, reactors 6 and 12, circuit breakers 7 and 13 will be de-energized, and there will be no voltage on the buses 8 and 14 to connect the motors, so the motors (not shown) are not rotary; When voltage appears on the tires

3 and 9 and when the first circuit breakers 4 and 10, starters 5 and 11, circuit breakers 7 and 13 are turned on in channels 1 and 2 on buses 8 and 14, voltage appears, and all the motors connected to them come into agitation. The power of input channels 1 and 2 is chosen such that, for example, in case of failure of tires 3, the first circuit breaker 4 and starter 5, the motors connected to buses 8 will continue to work, since the voltage to the reactor 6 will come through jumper 15 from the output of the starter 11 of the additional input channel 2. Reactors 6 and 12 provide a smooth start-up of the motors connected to the buses 8 and 14 due to the voltage drop across the inductors of the reactors 6 and 12.

Thus, the introduction of an additional input channel allows you to increase the reliability of the input cabinet, and the implementation of the conclusions for connecting the network and the conclusions for connecting the motor in the form of buses allows you to use this cabinet in multi-motor drives.

Sources taken into account:

1 Electrical part of power plants. Ed. S.V. Usova, L., Energy, 1977, p. 191, Fig. Z-29.

2 Venikov V.A. Transient electromechanical processes in electrical systems., M., Higher School, 1985, p. 373, Fig. 12.116.

Authors: - / fx - Yasven P.I.

Claims (1)

The input cabinet of a low-voltage complete device, containing in the input channel series-connected terminals for connecting the network, a first circuit breaker, a first starter, a first reactor, a second circuit breaker and terminals for connecting a motor, characterized in that it is equipped with an additional input channel containing other series-connected terminals for connecting the network, a third circuit breaker, a second starter, a second reactor, a fourth circuit breaker and other outputs for CONNECTIONS engine, wherein said channels are bridged installed between entrances of the first and second reactors, and in each of the channels for connecting the terminals and network connections for the motor are formed as tires.