LB6-110 Series Oil-Immersed Current Transformer

Our LB6-110 series oil-immersed current transformers feature aluminum alloy housing with excellent sealing, delivering superior insulation performance and long service life for 110kV power systems.

• Rated voltage from 66kV to 138kV with insulation levels up to 145/275/650kV; rated primary current from 50A to 3200A.

• Accuracy classes include 0.2, 0.2S, 0.5, 0.5S, 5P, and 10P with 4–6 combinations; rated output of 15–60VA.

• Short-time thermal current up to 45kA/3s with dynamic withstand current up to 115kA for robust fault capability.

• Advanced vacuum drying and oil-impregnation technology ensures dielectric loss tan δ <0.3% at 10kV and low partial discharge.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

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Product Series

Models include: LB-60W2, LB-66W2 (corresponding to LB-72.5W2), LB6-110W2 (corresponding to LB9-126W2), LB6-120W2 (corresponding to LB9-123W2).

Technical Specifications

Model	LB-60W2 (LB-72.5W2) LB-66W2	LB6-110W2(LB6-126W2) LB6-120W2(LB6-123W2)	LB-132W2 (LB-145W2) LB-138W2
Rated Voltage Ratio (kV)	66	110	132
Rated Voltage Ratio (kV)	60	120	138
Rated Frequency (Hz)	50~60	50~60	50~60
Rated Insulation Level (kV)	72.5/140/325	126/230/550	145/275/650
Creepage Distance (mm)	1820	3155	3630
Flashover Distance (mm)	800	1150	1400
Rated Short-time Thermal Current (kA)	5.3~45kA/3s	5.3~45kA/3s	5.3~45kA/3s
Rated Dynamic Withstand Current (kA)	13~115	13~115	13~115
Rated Primary Current (A)	50~3200	50~3200	50~3200
Rated Secondary Current (A)	1/5	1/5	1/5
Accuracy Class	0.2, 0.2S, 0.5, 0.5S, 5P, 10P (Any 4 to 6 combinations)
Rated Output (VA)	15~60	15~60	15~60
Instrument Security Factor (FS)	≤5/≤10	≤5/≤10	≤5/≤10
Accuracy Limit Factor (ALF)	10,15,20,30	10,15,20,30	10,15,20,30
Mounting Hole Dimensions (mm)	4xφ18	4xφ18	4xφ18
Overall Mounting Dimensions (mm)	475x475	475x475	475x475
Oil Weight / Total Weight (kg)	110/430	120/450	130/760
Overall Dimensions (mm)	790x570x2105	790x570x2315	790x570x2550

Application & Standards

Suitable for 60~145kV, 50~60Hz power systems, for current & energy measurement and relay protection.

Complies with standards including GB12 "Instrument Transformers".

Construction Type

Housing material classification: Standard Type and Cast Aluminum Type.

Key Features

Excellent sealing performance with longer service life, as seals are not exposed to air.

Aluminum alloy housing minimizes local eddy current heating and resists corrosion.

Compact and robust construction with tank-integrated bonding, offering aesthetic design and high mechanical strength.

Superior insulation performance and high process reliability.

Easy oil sampling device for accurate oil testing.

Advanced insulation processing using contour heat conduction, medium-temperature, high-vacuum drying technology ensures non-aging insulation and low dielectric loss (tan δ < 0.3% at 10kV).

Heated mist vacuum oil-impregnation technology ensures low partial discharge levels.

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