1. Install an insulating heat-shrinkable sleeve on the medium and low voltage side of the transformer

When the transformer is in use, the voltage level of the middle and low voltage side is very low. The outgoing line of the transformer is generally hard bus, so that all the insulation heat shrinkable can be installed from the terminal of the transformer to the bus of the switch cabinet. set. If a soft busbar is used, an insulating heat-shrinkable sleeve can be installed near the transformer connection pile head and the wall bushing. This can effectively prevent short circuits in the transformer caused by small animals. For transformers with different voltage levels on the medium and low voltage sides of the transformer, since their neutral point is a low-current grounding system, effective measures must be taken to prevent resonant overvoltage during single-phase grounding, which will cause insulation breakdown and cause transformer damage. Short circuit.

2. Curing the silicone rubber anti-pollution flashover coating on the pillar porcelain bottle on the low-voltage side of the transformer

When the transformer is in use, the high-voltage switchgear can be replaced with anti-pollution porcelain bottles with a larger creeping distance, or painted with room temperature curing silicone rubber anti-pollution flashover coating to prevent short circuit of the transformer caused by insulation breakdown. Moreover, the room temperature curing silicone rubber anti-pollution flashover coating should meet the requirements of the relevant national standards. It is also possible to replace the switch on the low-voltage side of the transformer with a switch with a larger breaking capacity to prevent the short circuit of the transformer caused by the explosion of the switch due to insufficient breaking capacity. All transformers, busbars and line arresters should be replaced by zinc oxide arresters with good performance to improve the overvoltage level of the equipment. Continuously improve the protection configuration of transformers. The relay protection of the transformer should be microcomputerized and dualized as much as possible, and the bus differential protection and failure protection should be installed as much as possible to improve the reliability, sensitivity and quick action of the protection action. The medium and low voltage sides of the transformer should be equipped with time-limited quick-break protection to ensure reliable and rapid removal of the fault when a short-circuit occurs in the transformer, and reduce the impact and damage of the short-circuit to the transformer.

3. Management measures to prevent transformer short circuit

First of all, we must strengthen the inspection of the transformer. During the use of the transformer, the transformer should be regularly inspected. The purpose of this is to ensure the use of the transformer. When the transformer is in use, the inspection of the transformer can make it possible The accidents that occurred were discovered in time to reduce the harm caused by the short-circuit of the transformer.

Secondly, it is necessary to do a good job in the calculation of the protection setting value in the use of the transformer. After scientific and reasonable calculation, the fault current flowing to the transformer can be cut off, so that the impact of the current on the transformer can be reduced, and the transformer failure can be avoided. As far as the substation is concerned, the protection setting can also be extended to the inside of the transformer, so that the protection of the transformer is very reliable.