4) Surge arresters in transformer
5) Types of surge arresters
6) How do surge arrester protect transformer
7) What exactly does a surge arrester do?
8) Advantage and disadvantage of surge arrester
9) Surge suppressor in transformer
10) How does surge suppressor protect
A device used on power system in high voltage, to protect
electrical equipments from lightning and switching surge .
It is a surge diverter.
This is also a surge diverter but generally used in low
It is generally used in electronics equipment.
This paper presents information about the characteristic
and design of arresters and suppressors.
In addition to applications, it also provides information
about the protection of transformer.
As we all know that, “a transformer is a
static device which transfer electrical energy
from one circuit to another without change
Transformer are very important and costly
apparatus in power system.
Factor that can damage transformer
2) Power frequency
Lightning is a sudden electro static discharge
between two clouds during storm.
When lightning strike transmission line then a
very high voltage generated with in it.
This high voltage causes failure in the insulation
capacity of transformer .
Which result in the bursting of transformer or
other electrical device.
We can protect the transformer from lightning by
1. surge arrester
2. surge suppressor .
Surge arrester in transformer
It protect transformer
from lightning and
It is also called Surge
It is also used in power
Types of arresters
Low-voltage surge arrester
DC or blowing valve-type arrester
Neutral protection arrester
Magnetic blow valve station arrester
How do surge arresters protect transformer or
What exactly does a surge
It does not absorb the lightning.
It does not stop the lightning.
It divert the lightning to ground.
It limit the voltage produced by lightning.
It only protects equipment electrically in
parallel with it.
At the Heart of all Arresters is the Metal
Oxide Varistor (MOV)
The MOV Disk is a semiconductor
that is sensitive to voltage .
At normal voltage the MOV Disk is an
insulator and will not conduct current.
But at higher voltage caused by
lightning it becomes a conductor.
The Metal Oxide Varistor (MOV) is a very fast acting
It is an open switch to standard system AC voltage
and a closed switch to
Advantage of surge arrester in transformer
The surge arrester protects the transformer.
The surge arrester alerts operator, when it is
The surge arrester can be changed live line.
A healthy arrester is present at all times.
Disadvantage of surge arrester
Conducting surge arrester blow fuses.
Surge arrester has no live line capabilities.
Unsafe maintenance of surge arrester.
Surge suppressors in transformer
Surge suppressor (surge protector) is a device to
protect electrical devices from surge voltage.
It is also known as transient voltage surge suppressor
This is also a surge diverter but used in low voltage
It is generally used in electronics equipment
How does surge suppressor
Blocking unwanted voltage or current.
Shorting to the ground.
What is surge voltage?
Short duration over voltage.
V Kamaraju(High Voltage Engineering)