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Machine room air conditioning and refrigeration equipment zero line charged causes and solutions
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Machine room air conditioning and refrigeration equipment zero line charged causes and solutions

July 20, 2022

Will the zero line of the air-conditioning and refrigeration equipment in the server room be charged? Under normal circumstances, there should not be electricity on the zero line. Therefore, once there is electricity, it is certainly the performance of the fault; the simplest is electromagnetic induction, and this time the zero line is not well grounded, failing to form a circuit.

Machine Room Precision AC Unit

Meanwhile, the leakage of power equipment or phase line touch shell, but the current is not considered large, so it has not tripped. In the three-phase four-wire power supply system, if the zero line is not well grounded or grounding end broken, the consequence is that the potential of the zero line is not equal to 0 when the three-phase load is unbalanced, which means that the neutral point is shifted.

 

 

Here are the causes and solutions of machine room air conditioning common zero line charged.

 

A.   There is leakage of electrical equipment on the line, and the protection device at the end of the action, so that the zero line with electricity.  (Solution: power outage for maintenance, to find the leaky equipment to repair, and find the cause of the end of the action of the protection device.)

 

B.    There is a phase on the line ground, the total protection device in the grid at the end of the protection, so that the zero line charged. Solution: After a power outage, first use a shaking table to measure the line to see if the line is poorly insulated, measurement should pay attention to the instrumentation in the line to disconnect.

 

C.   Room air conditioning zero line break, there is leakage in the electrical equipment behind the break or a large single-phase load operation, so that the zero line charged. Solution: test the zero line is broken after the power failure, broken to find and repair.

 

D.   In the zero grid, there are individual electrical equipment to take protection grounding and leakage, so that the zero line with electricity. Solution: distinguish between the system is a zero system or grounding system, or zero system for repeated grounding. Then the correct installation of the ground.

 

E.   In the zero grid, there is a single-phase electrical equipment using "a fire a ground" that is no work zero line, so that the zero line with electricity. Solution: Install the N line, not PE line as N line.

 

F.    In the grid there are electrical equipment insulation resistance, has been damaged and leakage, so that the zero line is charged. Solution: Check out the insulation resistance does not meet the requirements of the equipment, to repair.

 

G.  Room air conditioning in the transformer low-voltage side of the working ground connection poor contact, there is a large resistance in the three-phase load unbalance current exceeds the allowable range, so that the zero line charged. Solution: poor contact is not good to find, to be serviced annually or according to the prescribed time, can not be lazy, to be serviced according to the regulations.

 

H.   High-voltage flee into low-voltage, so that the zero line charged.  (Solution: bad to find, and sometimes a big problem. One of the most difficult to deal with, there is a danger to people. Be sure to follow the operating procedures to operate.)

 

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