Electromagnetic GIS-type SSVT AIS

Designed for the North American power grid in compliance with IEC / IEEE standards, the CPGV Series is a vertical-structure SSVT that combines voltage transformation with station auxiliary power supply. It directly taps high-voltage transmission lines and steps down voltage to support heavy station loads, while optional metering windings are available. By integrating the functions of a VT and a distribution transformer, it saves substation space, reduces construction costs, and is widely used in 69 kV … 765 kV systems across the U.S.

Core Design for Superior Performance

The iron core is crafted from high-quality cold-rolled silicon steel sheets, cut and laminated with fully automated equipment to ensure consistent electrical characteristics in mass production. With a low design magnetic flux density and a special core structure, the CPGV Series effectively minimizes the risk of ferroresonance.

Precision-Wound Windings

The primary winding is manufactured by fully automatic winding machines for precise control over turns and dimensions. Interlayer insulation uses diamond-dotted adhesive film, and the winding wires are premium enamelled copper wire. After heat curing, the winding achieves excellent electrical characteristics and mechanical strength.

Robust and Leak-Tight Enclosure

The housing is made of welded or cast aluminum alloy. Each unit undergoes strict leakage testing and ultrasonic flaw detection prior to use, ensuring a leakage rate ≤ 0.1% per year.

Flexible Exterior Insulation Options

Choose between silicone rubber composite insulators or high-strength porcelain insulators, with creepage distances tailored to on-site pollution levels for optimal performance in various environments.

Eco-Friendly and Reliable

The interior can be filled with dry air or N2 gas without compromising insulation performance, reducing GWP to zero compared to SF6. The lightweight structure offers excellent seismic performance, simplifying transportation and installation. Prior to delivery, each unit undergoes high-temperature drying to ensure trace moisture levels remain far below both industry standards and customer requirements.

Voltage Transformer Key Parameter Review

	72.5 kV	123 kV	245 kV	362 kV
Type	CPGV 72.5	CPGV 123	CPGV 245	CPGV 362
Rated Ins. Level (kV)	72.5/140/350	123/230/550	245/460/1050	362/575/1300
Rated Frequency (Hz)	50 or 60	50 or 60	50 or 60	50 or 60
Thermal Class	B	B	B	B
Rated Voltage Factor	1.2/Cont., 1.5/30s	1.2/Cont., 1.5/30s	1.2/Cont., 1.5/30s	1.2/Cont., 1.5/30s
Quantity of Sec. Winding	1 to 2	1 to 2	1 to 2	1 to 2
Max. Burden (kVA)	100	100	100	167
Size A (mm)	2342	2820	4224	5085
Size B (mm)	860	1308	2440	3050
Size C (mm)	100	100	100	100
Size D (mm)	365	375	520	600
Size E (mm)	850	1000	1000	1300
Weight (kg)	1290	1620	2180	2950