Circuit breaker and leakage switch how to wire the physical map

When used for branch line protection, each branch line should have its own dedicated zero line, and the zero lines of two neighboring branch lines should not be connected. If the two branch lines are connected, the current in the zero line flows in each other, destroying the balance of the working current in the zero-sequence current transformer and making the earth leakage switch malfunction.

If in the process of use, accidentally leakage or electric shock conditions, then the sum of the three-phase current will no longer be equal to zero, but equal to a certain current value Is, it will pass through the human body, the earth, the center of the transformer to form a circuit so that the secondary side of the zero-sequence current transformer to produce with the Is corresponding to the induced electromotive force, added to the release of the button, when the Is reaches a certain value, the release of the button action to promote the locking of the main switch, the breakthrough. The main switch is latched, breaking the main circuit.

Expanded information:

Leakage switch wiring error:

1, for branch line protection, each branch line should have their own dedicated zero line, and the two neighboring branch lines of the zero line shall not be connected. If the two branch lines are connected, the current in the zero line current flow, destroy the balance of the zero sequence current transformer in the working current, so that the leakage switch error. If you want to utilize the zero line of the power branch line as the zero line of the lighting branch line, it will cause the leakage switch of the power branch line to operate.

2, a power equipment can only be connected to a protective branch circuit, not across the two branch circuits, not connected to the front of the zero sequence transformer, and not to take a line of one-ground system power supply, otherwise, it will lead to leakage switch error.

3, equipped with a leakage switch and not equipped with a leakage switch of electrical equipment, not **** with a grounding device. For example, when the insulation of the motor M1 is damaged and the shell is charged, the shell of the motor M2 is also charged, because the current does not pass through the leakage switch, so it does not play the role of leakage protection.

4, single-phase load should be distributed as evenly as possible. If the distribution is not equal (such as a phase of the line is long, the equipment is concentrated), the heavier load of a phase, the leakage current is large, so the trunk of the three-phase unbalanced leakage current increases to a certain value will make the leakage switch action of the first end of the trunk.