A solution for high accuracy measurement of your electric power grid
The PA current transformers are used in electric Hitachi Energy with a system voltage of up to 145 kV and a frequency of 50 Hz.
They are designed using top core current transformer construction. The active elements are located in a hermetic housing inside the head of the transformer. PA current transformers are filled with PCB-free transformer oil.
Top core construction makes it possible to achieve high values of thermal and dynamic short-circuit currents, as well as a broad range of rated primary currents and secondary output windings.
- Revenue metering
- Relay protection
Why Hitachi Energy?
Hitachi Energy has developed a state-of-the-art design to provide benefits to our users for better electrical performance, improved environmental withstand and a long trouble-free life. This is accomplished with:
- Very low electric energy losses
- Stable measuring accuracy during whole lifespan of the apparatus
- No active parts in insulator
- Excellent control of electric stresses that excludes possibility of primary insulation puncture
- Excellent insulation strength in transient conditions
- All parts made of non-corroding materials
- Maintenance free
- Short delivery dates
- Long lifespan of over 25 years
General data of the Instrument Transformer
|Compliance with Standards||IEC 61869-2, PN-EN 61869-2|
|Highest system voltage||123 kV||145 kV|
|Rated power – frequency withstand voltage at 50 Hz||230 kV / 60 s||275 kV / 60 s|
|f = 50 Hz||f = 50 Hz|
|Rated lightning – impulse withstand voltage 1.2 / 50 µs||550 kV||650 kV|
|Minimum creepage distance||16; 20; 25; 31 mm/kV|
|Rated frequency||50 Hz|
|Total weight||420; 360* kg|
|Insulating oil weight [free]||85 kg|
|Ambient temperature||-40oC to +40oC|
|Altitude||Max. 1000 m|
|Humidity||up to 100% at 30oC|
|Internal partial discharges||below 10 pC at 1.2 Um according to IEC 60044-1|
|Dielectric loss factor||tan δ < 0.25%|
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