Identification of causes of power outage in refrigerated warehouse

Cold storage usually requires a lot of power support. Once the power supply system fails, such as cable or circuit breaker failure, it will cause a power outage in the cold storage. The refrigeration equipment of the cold storage is the key to maintaining the air temperature. If a refrigeration unit fails, it may use more power or even shut down suddenly. Human factors are also one of the reasons for sudden power outages in cold storage. If an employee accidentally touches or pulls out the plug during operation, or accidentally pulls off the wire, etc., it may cause a power outage in the cold storage.
In the case of identifying the cause of power outage in the refrigerated warehouse, Zhongke Testing can provide identification services for the cause of power outage in the refrigerated warehouse.

1, the air switch is too small. If the rated current of the
air switch is smaller than the load operating current, the air switch will trip. This is one of the common trips in Kuhua.
2. The thermal relay is too small.
If the current exceeds the set value of the thermal relay, the thermal relay will trip, cut off the control circuit, and the motor will not run. It can be reset manually or automatically. The reasons for poor thermal relay protection generally include: the thermal relay setting value is too small; the compressor or other motors are not operating normally; the environment or water temperature is too high, causing the compressor condensation pressure to increase, causing the operating current to increase.
3, line leakage, short circuit
line leakage often causes the cold storage to trip. As long as there are wiring and motors, there may be leakage.
4, refrigeration unit high pressure protection or low pressure protection
Refrigeration unit high pressure is too high or low pressure is too low, will cause the unit not to operate.

One night, a fire flashed at the door of the refrigerated warehouse and the cables burned. After a while, the fire went out, but it also burned the cable. This cutoff also cut off the power to the warehouse. The five or six tons of seafood in the warehouse quickly went bad and smelly because they were not kept fresh. The owner of the cargo, Mr. Liu, suffered heavy losses. The warehouse was newly built when the accident occurred, and the cables were also newly purchased. Logically speaking, the quality should not be so poor. Therefore, Mr. Liu took the cable manufacturer to court.
was entrusted by the court and our company accepted the task of identifying and analyzing the cause of the power outage in the refrigerated warehouse involved.
identification and analysis results: The
identification and analysis expert team went to the site for inspection and made a preliminary observation of the burned cable. They found that the strength of the outer insulating adhesive layer at the break was very low and could be torn apart with force. The inner wires also looked thinner and showed signs of melting.
Then, the expert team took samples and sent them to the laboratory for testing. At the same time, they asked the merchant for relevant production technical qualification information, but the merchant failed to provide it.
concluded from laboratory test results that the outer material of this batch of cables did not meet the relevant regulations and the strength was too low. If the diameter of the wire is too small and the current exceeds the endurance range, it will melt at high temperature or even burn on its own.
This batch of cables is of poor quality and does not meet national standards. In fact, the investigation found that the cable manufacturer did not have relevant production qualifications and the product was a three-no product.