Huawei STS-6000K-H1 Installation Manual page 18

STS-6000K-H1 Smart Transformer Station (Vietnam,
Duc Long Gai Lai)
Installation Guide
Figure 2-6 Transformer
No. Item
1 Gas relay
2 Oil surface
thermometer
3 Oil feed and drain
valve
4 Oil level gauge
Issue 02 (2020-02-21)
Function
Generates a gas
accumulation alarm or
an oil flow trip.
Measures and controls
the temperature of the
top layer of transformer
oil.
Refills or drains oil.
Indicates the oil level.
Copyright © Huawei Technologies Co., Ltd.
Description
 When a minor fault occurs on the transformer,
the oil of the transformer generates gas. The
gas will rise and enter the gas relay. In this
case, the reed switch contact for gas
accumulation will be closed to send signals.
When there is too much gas, it can be released
through the gas nozzle of the gas relay.

When there is a strong gas flow in the
transformer, the reed switch contact for oil
flow will be closed and the circuit breaker of
the ring main unit will trip.
Displays the top layer of transformer oil in real
time and issues alarms and trip signals through
the built-in temperature control switch.
 Oil refilling: Refill the transformer oil using
an uncontaminated metal or non-rubber hose
and oil injection equipment. (Note: Prevent air
from entering.)
 Oil draining: Lead the transformer oil to a
container using an uncontaminated metal or
non-rubber hose.
Indicates the oil level of the transformer oil
cabinet and reports the alarms of high and low oil
2 Product Overview
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