What is the purpose of Surge Arresters on 2 Sides of a Transformer?
Surge arresters prevent against overvoltages by being installed on both sides of a transformer (high-voltage and low-voltage).
Surge arresters are also installed on both the HV and LV sides to protect the transformer from transient overvoltages & lightning surges from either direction.
Here’s the 4 reason both sides need them:
1). High-Voltage Side Protection
2). Low-Voltage Side Protection
3). Internal Voltage Transfer
4). Coordination with Grounding
1). High-Voltage Side Protection
Protects transformers from lightning and power system surges.
2). Low-Voltage Side Protection
Overvoltages can still arise due to
- Internal switching,
- Back-feeding, or
- Surge flowing
through the transformer.
A surge arrester protects downstream equipment and transformer windings.
3). Internal Voltage Transfer
Magnetic coupling can cause a surge to cause a high voltage on other side.
Arresters on either side help to reduce these transferred surges.
4). Coordination with Grounding
Arresters on both sides ensure adequate
- Voltage clamping and
- Safe dissipation of surge energy to ground.
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