Huawei STS-3000K-H1 Installation Manual page 21

STS-(3000K, 6000K)-H1 Smart Transformer Station
(Spain, Eiffage Turroneros)
Installation Guide
Figure 2-8 Transformer
No. Item
1 Gas relay
2 Oil feed and drain
valve
3 Dehydrating
breather
Issue 02 (2020-02-21)
Function
Generates a gas
accumulation alarm or
an oil flow trip.
Refills or drains oil.
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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.
 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.
The insulation oil in the conservator is connected
to the atmosphere through a dehydrating breather
with silica gel to absorb moisture and impurities
in the air and maintain the performance of the
2 Product Overview
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