1., the load should be reduced appropriately. 2., check whether the power factor is lower (preferably over 0.95, not less than 0.8), such as lower capacity should be connected in parallel with appropriate capacitance compensation. 3. to check whether the three-phase load is balanced, the three-phase current should be balanced. 4. check whether the power supply voltage is too high and adjust the voltage properly so that the voltage is below 400V
Transformer protection device is a kind of power automation hi tech product which integrates protection, monitoring, control, communication and other functions. It is an ideal electric unit for intelligent switch cabinet.
Operation principle transformer differential protection device is the main protection of transformer, which is installed according to the principle of circulating current. Mainly used to protect double winding or three winding transformer winding internal and its lead out of the line with various inter phase short-circuit fault, but also can be used to protect the transformer single-phase inter turn short circuit fault.
First, then why is the grounding of transformer core only one point grounding?
Because a, but there are two points above the ground, shorted loop is formed between two or more points, the grounding piece shorted the core column, forming a short loop induction circulation, the core of local overheating burned patch insulation, may also be caused by the discharge of the tank wall, straight to insulation breakdown burn out the transformer.
Two, cause the transformer core grounding:
1, when the grounding piece is not made, the silicon steel sheet is short circuited, or the insulation of the iron piece and the iron core is not processed in itself, and the tool or the conductor is left behind in the iron core or in the oil tank.
2, because of the external and accessories factors cause multi-point grounding, usually there:
In the repair or transformer assembly, due to lack of attention or maintenance of individual attachment length, skew, edge, core shell caused by touch, touch clamps, core splint touch iron core columns, steel sheet forming with iron core clamping piece splint, stepping with silicon touch, touch and other core thermometer is too long.
The nail is too long and the silicon steel sheet or bolt body, short lap.
Enter the water tank to the foreign or local short circuit of silicon steel sheet.
The core insulation damp or damage, the silt and water, wood makes damp down insulation, forming a resistance grounding.