RU27746U1 - LOW VOLTAGE COMPLETE DEVICE - Google Patents

Description

LOW VOLTAGE COMPLETE DEVICE

The utility model relates to the field of electrical engineering and can be used in auxiliary systems of power plants as a low-voltage complete device that distributes electricity between mechanisms driven by asynchronous motors with a squirrel-cage rotor of various capacities.

Known low-voltage complete device containing linear contactors, acceleration contactors, maximum relays, current direction relays, acceleration relays, voltage relays, brake relays, blocking relays, intermediate relays, circuit breakers and fuses 1. This device, called a magnetic station, has been widely used in various areas of technology due to its simplicity and high reliability, however, it also has drawbacks, among which the main ones are the lack of devices for limiting the starting currents of motors, you low packing density of circuit elements, making tincture and repair difficult.

Closest to the technical nature of the claimed utility model is a low-voltage complete device for powering gate valves and remote control columns of the auxiliary system of power plants, containing the first and second power sections, including a serially connected input bus, circuit breaker, circuit breaker and intermediate bus to which are connected the first and second switches, and four reactors, the inputs of which are connected to the corresponding switches of the power sections, and the output connected with the contactors, each of which is connected to the two respective actuators, through the tire assemblies coupled to the respective engine valve 2. The apparatus is widely used to power any type of view of the simplicity of circuitry possible soft starter engine valves provided

reactors, and uninterrupted power supply, however, it also has drawbacks: a large number of switching devices used, which leads to the high cost of a low-voltage complete device, a high voltage drop in normal mode and in the mode of current limitation during short circuit due to inductors of the reactors and a large area occupied by the equipment of the device .

The technical result of the utility model is to reduce the voltage drop in all operating modes of the low-voltage complete device and the area occupied by the equipment of the device.

The technical result achieved is achieved in that in a low-voltage complete device containing the first and second power sections, each of which contains an input bus, a switch, a circuit breaker and an intermediate bus, to which the first and second switches are connected, in addition, the first and second reactors the inputs of which are connected to the first and second switches of each power section, respectively, and the first outputs are connected, respectively, to the first and second contactors, each and which are connected to two corresponding starters, each of which is connected to the corresponding valve motor through the corresponding assembly bus, as well as third and fourth contactors, each of which is connected to two other starters, each of which is connected to the corresponding valve motor through its assembly bus made double, and their second outputs are connected, respectively, with the third and fourth contactors.

The drawing shows a circuit diagram of a low-voltage complete device.

Low-voltage package device, contains the first 1 and second 2 power sections. The first power section 1 contains a serially connected input bus 3-1, a switch 4-1, a circuit breaker 5-1 and an intermediate bus 6-1, to which the first

7-1 and second 7-2 switches. The second power section 2 contains a serially connected input bus 3-2, switch 4-2, circuit breaker 5-2 and intermediate bus 6-2, to which the first 7-3 and second 7-2 switches are connected. The device also contains the first 8-1 and second 8-2 dual reactors, the inputs of which are connected to the first 7-1 and 7-3 and second 7-2 and 7-4 switches of the first 1 and second 2 power sections, respectively, and the first outputs connected, respectively, with the first 9-1 and second 9-2 contactors. The second outputs of the dual reactors 8-1 and 8-2 are connected to the third 9-3 and fourth 9-4 contactors, respectively. Each contactor 9-1 ... 9-4 is connected to two corresponding ones; to them starters 10-1 and 10-2, 10-3 and 10-4, 10-5 and 10-6, 10-7 and 10-8, each of which, through its assembly bus 11-1 ... I-8, is connected to the corresponding valve motor 12-1 .. .12-8.

The device operates as follows. In the static state, in the absence of supply voltage, the power sections 1 and 2 are de-energized, so there is no voltage on the input buses 3-1 and 3-2 and on the intermediate buses 6-1 and 6-2 when the circuit breakers 4-1 and 4-2 and automatic switches 5-1 and 5-2. The lack of voltage on the intermediate buses 6-1 and 6-2 leads to a blackout of the dual reactors 8-1 and 8-2, regardless of the position of the switches 7-1 ... 7-4. The absence of currents in the coils of reactors 8-1 and 8-2 determines the absence of voltage on the buses of the assemblies 11-1 ... 11-8, regardless of the position of the contactors 9-1 ... 9-4 and starters 10-1 ... 1- 8, therefore, the valve motors 12-1 ... 12-8 do not rotate. If there is voltage on the input bus 3-1 of the power section 1 and when the circuit breaker 4-1 and the circuit breaker 5-1 are turned on, voltage will appear on the intermediate bus 6-1, so when the switches 7-1 and 7-2 are turned on in the reactor coils 8 -1 and 8-2 will flow corresponding currents. The presence of currents in the coils of the reactors 8-1 and 8-2 and the closed state of the contactors 9-1 ... 9-4 and starters 10-1 ... 10-8 provides voltage on the assembly buses

11-1 ... 11-8, so the valve motor 12-1 ... 12-8 will begin to rotate. When the voltage disappears on the input bus 3-1 of the power section 1, switches 7-3 and 7-4 connect the dual reactors 8-1 and 8-2 to the intermediate bus 6-2, to which the voltage comes from the input bus 3-2 of the power section 2 when the circuit breakers 4-2 and the circuit breaker 5-2 are turned on. The remaining elements of the circuit work as described above.

The use of dual reactors made it possible to simplify the circuit of a low-voltage complete device by reducing the number of switches by 2 times, reduce the area occupied by the equipment, and reduce the voltage drop across the inductances of the coils of dual reactors due to the interaction of currents in the coils, since the directions of the currents in them usually do not coincide. At the same time, the cost of the device is further reduced.

Sources taken into account:

1 Rodshtein L.A., Electrical apparatuses. L., Energy Publishing House, 1981, p. 263, fig. 21-2.

2 Electrical part of power plants. Ed. S.V. Usova, L., Energy, 1977, p. 193, fig. 3-30.

Author:. Kirillov N.P.

Claims (1)

A low-voltage package device containing the first and second power sections, each of which contains an input bus, a circuit breaker, a circuit breaker and an intermediate bus, to which the first and second switches are connected, in addition, the first and second reactors, the inputs of which are connected to the first and second switches of each power section, respectively, and the first outputs are connected, respectively, with the first and second contactors, each of which is connected to two corresponding starters, each the second of which, through the corresponding assembly bus, is connected to the corresponding valve motor, as well as the third and fourth contactors, each of which is connected to two other starters, each of which is connected to the corresponding valve motor through its assembly bus, characterized in that the reactors are doubled, and their second outputs are connected, respectively, to the third and fourth contactors.