The question about two incoming lines and one bus !

The first problem is that this operation mode is a parallel loop operation mode, which can balance the load of the transformer in the electrical operation mode, and the secondary scheme is used for large power grids. But the switch, protection, power supply must have high requirements, 1The breaking current of the circuit breaker should be larger in the parallel loop closing mode, because the resistance of the system circuit will be reduced by half after the loop is closed, the maximum short-circuit current of the system will be doubled, and the sub-switches, especially the molded case switches, will have a high damage rate and increase the risk.

2.High protection requirements. When a fault occurs, it can cause a total power outage, and the power supply is reliable without disconnecting operation.

Low-voltage switches generally do not have directional protection, so they are risky. 3. The requirements and influence on the power supply, the parallel loop operation mode requires voltage, the phase angle of the voltage, and the short-circuit impedance of the transformer must be in a certain range or equal. At the same time, this method can easily lead to safety accidents caused by discharge and transmission during operation, so low voltage is not used in a small system.

The second problem is that the power factor of the two incoming lines is generally the same under the parallel loop operation mode, and the current is evenly divided when the short-circuit impedance is the same, of course, if the transformer capacity is inconsistent, it will lead to different currents, which is easy to understand. In terms of capacitance, I think the sampling current of the two units is two respectively, if the current is the same, I think it is still a problem with the parameter setting of the compensator or the capacity of the configuration capacitor, please check the compensator is the switching threshold, the capacity setting of the capacitor, the ratio of the flow to each other, the time setting, and the target power factor.

The first problem is that this is not a conventional mode of operation, and this situation is generally a temporary way when the incoming and outgoing equipment or the main transformer and its switch and knife switch are out of operation.

<> two incoming lines and one bus connection.

Two incoming lines refer to: two mains. Under normal circumstances, "Mains 1" supplies power to "Load 1", and "Mains 2" supplies power to "Load 2".

When "mains 1" is abnormal, first divide 1 incoming switch (circuit breaker), and then close 3 bus tie switches (circuit breaker). Mains 2 supplies power to Load 1 and Load 2. And so on.

WQ6 bus tie controller answers for you!

Two incoming lines refer to the power supply of two transformers, which is generally supplied by two power stations in one area.

Two incoming lines and one bus, is a two-section incoming cabinet, each section of the incoming line with a certain load outgoing cabinet, in the middle of their separation with a contact cabinet, these three cabinets can be realized through the interlock, two sections of incoming lines are separately powered by power, can realize a section of power supply through the bus to drive the second section, can also be two sections of power supply through the bus to drive a section.

If helpful, choose lightly satisfied.

Two AC contactors are connected to each other at the incoming end, and there is normally a power supply.

Is the bus tie breaker here an AC or DC part?

: When the first power supply and the second power supply are normal, the 3 bus tie switch is disconnected, the 1 inlet switch is closed, and the 2 inlet switch is closed. One load is powered by one power supply, and two loads are powered by two power supplies.

If one power supply fails at this time, and the second power supply is normal, the 1 inlet switch is disconnected with a delay, and then the 3 bus coupling switches are closed, and the two loads are powered by the two power supplies.

When the first power supply returns to normal, the 3 bus tie switch is delayed and disconnected, and then the 1 incoming line is closed and closed, and the first load is powered by the first power supply, and the second load is powered by the second power supply.

If the second power supply is faulty at this time, and the first power supply is normal, the 2 inlet switches will be disconnected in a delay, and the 3 bus coupling switches will be closed, and the two loads will be powered by one power supply.

When the second power supply returns to normal, the 3 bus tie breakers are delayed and disconnected, the 2 incoming wires are switched and closed, and one load is powered by one power supply, and the second load is powered by two power supplies.