# What is the difference between differential protection of transformer and generator?

Contents

What is the difference between differential protection of transformer and generator? There is no difference. Differential protection is differential protection. … Any winding short either to ground or winding to winding will result in a mismatch of currents causing the differential relay to operate.

## What is the difference between generators and transformers?

Generator and Transformer: An Introduction

These two devices work based on Faraday’s law of electromagnetic induction principle. The “Generators” generate current, and transformers convert between current and voltage.

## What is the protection of transformer?

The protection of a transformer against the overloads is performed by a dedicated protection usually called thermal overload relay. This type of protection simulates the temperature of the transformer’s windings. The simulation is based on the measure of the current and on the thermal time constant of the transformer.

## Why NGR is used in generator?

So, the primary purpose of an NGR in the power system is to limit the high current that flows because of the line to earth fault. An NGR works as a fault current regulator. It limits the fault current with resistance. … Neutral grounding resistors can also help operate the Earth Fault Relay.

## Can a transformer change frequency?

The transformer cannot change the frequency of the supply. If the supply is 60Hz, the output will also be 60 Hz. … Frequency of the system will vary as load is added to the system or as generators are shut down; other generators are adjusted in speed so that the average system frequency stays nearly constant.

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## Can motor be used as generator?

Both brushed and brushless DC motors can be operated as generators. … maxon DC motors are very efficient, this is also true when operated as generators. The basic calculations between speed and voltage as well as current and torque are very simple.

## Which relay is used in transformer?

Relays for Transformer Protection

SL Voltage Ratio and Capacity of Transformer Common Relays
9 400/220KV 315MVA Differential Relay Overflux Relay Buchholz Relay OLTC Buchholz Relay PRV Relay OT Trip Relay WT Trip Relay Over Load (Alarm) Relay