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LVB-35

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35–500 kV Oil-Immersed Inverted Current Transformer

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35–500 kV Oil-Immersed Inverted Current Transformer

Detailed Introduction

Oil-immersed inverted current transformer environmental parameters (customizable for extreme and high-altitude conditions)

Ambient temperature: maximum +45°C, minimum -45°C
Altitude: ≤2000m
Contamination Level: Class D/Class E Contamination
Ice thickness: not exceeding 20 mm
Maximum wind speed: not exceeding 35 m/s
Intended use: Indoor or outdoor

Performance Characteristics of Oil-Immersed Inverted Current Transformers

1. Insulation and Weather‑Resistance Performance: Utilizes oil‑paper composite insulation, offering high dielectric strength and low partial discharge, suitable for 35 kV to 1000 kV high‑voltage applications. The fully sealed structure, combined with an expander that isolates air and moisture, ensures excellent resistance to humidity and oil degradation, enabling stable long‑term outdoor operation. The high‑strength porcelain bushing provides external insulation that is resistant to pollution flashover, UV radiation, and extreme temperature fluctuations, while performing reliably in rainy, snowy, windy, and sandy conditions.
2. Electrical Performance: High turns-ratio accuracy, low metering winding error, and excellent linearity, meeting the requirements for electrical energy measurement. The protection winding exhibits superior saturation characteristics, enabling accurate transformation of fault currents under short-circuit conditions and ensuring compatibility with relay protection schemes. It features low excitation current, strong load‑carrying capability, and a wide secondary‑load range. Operating temperature rise is low, with insulating oil circulation providing effective heat dissipation, and it demonstrates good overload capacity.
3. Excellent thermal and dynamic stability: It can withstand a short-time thermal current of 50–63 kA for 3 seconds, resists short-circuit surges, and is suitable for high-capacity systems.
4. Transient Characteristics
5. It can be equipped with a transient‑protection winding, meeting the requirements of reclosing and fast‑acting protection. Wide‑temperature stability: operable from –45°C to +45°C; high‑vacuum drying followed by vacuum oil impregnation ensures insulation that resists aging.

Structural features

1. Inverted design: The primary winding is positioned below, while the secondary winding is above—opposite to the conventional upright configuration. The primary conductor passes vertically through the center of the secondary winding, resulting in high mechanical strength and excellent short-circuit withstand capability.
2. Fully enclosed assembly: Composed of an expander, oil conservator, tank body, high‑strength porcelain bushing, cast aluminum alloy base, and secondary terminal box, it features a compact structure.
3. Oil-paper capacitive main insulation: a composite insulation consisting of insulating oil and cable paper, featuring low dielectric loss (≤0.3%), minimal partial discharge, and a long insulation life.
4. Multi‑terminal electric field optimization: The inner casing features a multi‑shielding structure, ensuring uniform electric field distribution, reducing partial discharge, and enhancing operational reliability.

Oil-immersed inverted current transformer parameters (special parameters can be customized)

Product model	LVB(T)-35	LVB(T)-66	LVB(T)-110	LVB(T)-220	LVB(T)-330	LVB(T)-500
Product Type	Outdoor, single-phase, oil-immersed, inverted type
Rated Voltage (kV)	35	66	110	220	330	500
Maximum Voltage (kV)	40.5	72.5	126	252	363	550
Rated frequency	50Hz
Polarity	Negative polarity
Short-time power-frequency withstand voltage (kV)	95	160	230	460	510	740
Lightning Impulse Voltage (kV)	200	350	550	1050	1175	1675
Rated primary current (A)	300-8000	300-8000	300-8000	600-8000	1250-8000	1250-8000
Rated secondary current (A)	1 or 5
Accuracy level	PX, TPS, TPY, 5P, 10P, 0.5, 0.5S, 0.2, 0.2S
Rated Output (VA)	10~50
Rated primary current amplification value	120%
Power factor	0.8/1
Nominal Creepage Distance (mm/kV)	25 or 31
Short-term thermal current/duration	40 kA /3s	40 kA /3s	40 kA /3s	50 kA /3s	63kA/3s	63kA/3s
Rated dynamic stability current	100 kA	100 kA	100 kA	125 kA	160kA	160kA
Ambient temperature	-45 to 45℃
Product appearance, dimensions	Subject to the product confirmation drawing.
Total product weight (kg)	360	380	420	800	2800	2800