Transformers are
expensive products that need to be protected. Manufacturers of distribution
transformers India need to provide proper maintenance care to the transformers and The power transformer protection is realized with two distinct types of
devices, one is the measuring device that measures the electrical quantities
that affect the transformer through instrument transformers. Other is the
device that indicates the status of the physical quantities.
We will discuss
top protection devices used by manufacturing units for transformers.
•
Buchholz (Gas) Relay
•
Oil level Monitor Device
•
Pressure Relay
•
Winding Thermometer
Buchholz (Gas) Relay – This equipment is a mechanical fault detector
used by manufacturers to determine electrical faults in oil-filled transformers.
The Buchholz (gas) relay is placed within the pipe between the main tank and
the oil conservator in transformer. The conservator pipe has to be inclined
slightly for reliable operation.
This equipment
normally has a pivoted float and a pivoted vane. Both the float and the vane
carry different mercury switches. The casing is filled with oil and the
switches are open.
Pressure Relay:
Most power
transformers with an on-tank-type tap changer are equipped with a separate tap
changer oil compartment for pressure protection. This protection determines a
sudden rate-of-increase of pressure inside the oil enclosure of the tap
changer.
When the pressure
in front of the piston increases the spring counter force, the piston will move
and operate the switching contacts.
Frangible disk is
the simplest form of pressure relief device used by manufacturers. The surge of
oil caused by a severe internal fault bursts the disk and lets the oil to
release rapidly. Relieving and bounding the pressure rise help prevent
explosive rupture of the tank and fire.
Oil level monitor device:
Transformers that
are equipped with oil conservator expansion tank are having an oil level
monitor. This monitor has two contacts for alarm.
Winding Thermometer:
It responds to
both the top-oil temperature and load current heating effect. It creates an
image of the hottest part of the winding. The top-oil temperature is measured
with a same method i.e. oil level monitoring device.
These are the
devices used by manufacturers of distribution transformers India to protect their transformers. Experts are already using
these devices to provide protected transformer equipment's to their clients. If
you want any, ask experts today.
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