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STS-(3000K, 6000K)-H1 Smart Transformer Station Installation Guide
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STS-3000K-H1 Transformer Room (Huapeng)

STS-3000K-H1 Transformer Room (Huapeng)

The transformer room is used to convert the LV AC power into the MV AC power. The main equipment is a transformer configured with gas, oil temperature, pressure, and oil level protection. A comprehensive protection device is also configured in the MV room for the transformer.

Figure 2-13 Transformer






Dehydrating breather


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 insulation oil.


Oil surface thermometer


Displays the top layer of transformer oil in real time and issues alarms and trip signals through the built-in temperature control switch.


Oil level gauge

Indicates the oil level.

Indicates the oil level of the transformer oil cabinet and reports the alarms of high and low oil levels.


Oil feed and drain valve

Refills or drains oil.

  • 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.


Gas relay

Generates a gas accumulation alarm or an oil flow trip.

  • 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.


Off-load tap changer

Regulates the voltage.

There are five levels. Level 1 indicates the maximum tapping value, level 3 indicates the rated tapping value, and level 5 indicates the minimum tapping value.


Pressure relief valve

Releases pressure.

If a transformer is faulty, a large amount of gas is generated, and the pressure of the insulation oil increases sharply. When the certain threshold is reached, the transformer oil is discharged and the internal pressure of the transformer decreases to a normal value. At the same time, a signal is sent to trip the circuit breaker in the ring main unit.

Updated: 2019-12-05

Document ID: EDOC1100115701

Views: 2821

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