What is the purpose of Surge Arresters on 2 Sides of a Transformer?

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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