Gas-Insulated Station Service Transformers (SSVTs , 72.5–550kV)

Property Specification

Type: Gas-Insulated High-Voltage Station Service Voltage Transformer / SSVT (72.5 kV to 550 kV)

Features: Merging the measurement accuracy of a potential transformer with the load-serving capacity of a small distribution unit, this gas-insulated SSVT provides auxiliary power output for transmission systems up to 550 kV. Built housed within a weather-resistant aluminum alloy casing, it features high-permeability grain-oriented steel laminations and electrolytic copper windings. Operational safety and health monitoring are ensured through continuous remote insulation tracking via a pressure gauge with alarm and lockout switches, paired with an integrated pressure relief valve to mitigate overpressure conditions. Available options include extra revenue metering windings,

Applications: Substation station service power supply, rural and isolated community electrification, oil and gas extraction field power, rail network and airport facility powering, mining/construction site electrification, emergency power for hospitals and defense installations, switching station control power, renewable wind and solar farm auxiliary feeds, flood control pumping stations, aviation safety transmission line warning lights, and off-grid cellular telecommunications towers.

Description

Key Technical Performance Specifications

Technical Parameter / Specification  Inductive Power Transformer Underground/Grounded Unit
Deployment / Environment Outdoor Outdoor
Dielectric Insulation Medium SF6 Gas or SF6 / N2 Gas Blend SF6 Gas or SF6 / N2 Gas Blend
Rated Maximum System Voltage 72.5 – 550 kV 72.5 – 550 kV
Power-Frequency Withstand Voltage Up to 630 kV Up to 630 kV
Lightning Impulse Withstand Voltage Up to 1550 kV Up to 1550 kV
Maximum Apparent Power Output per Phase Up to 500 kVA Up to 167 kVA
Secondary Output Voltage Rating Low or Medium Voltage Low Voltage
External Insulator Material Composite Composite
Minimum Operating Ambient Temperature

-30°C (100% SF6)

-50°C (SF6 / N2 blend)

-30°C (100% SF6)

-50°C (SF6 / N2 blend)

Maximum Operating Ambient Temperature +50°C +50°C
Environmental Pollution Classification Level IV (Very Heavy) Level IV (Very Heavy)