LCWD1-35 Current Transformer Overview

The LCWD1-35 (LABN1-35W2) current transformer is an oil-insulated, outdoor device, engineered for use in 35kV, and below AC power systems with rated frequencies of 50Hz or 60Hz. Oil-Insulated Outdoor Current Transformer is Designed for energy metering, current measurement, and relay protection, it combines compact design, lightweight construction, and exceptional reliability. Its robust vacuum-dried and oil-filled structure ensures excellent insulation and long-term durability, making it ideal for medium-voltage power systems operating in challenging outdoor environments.

Type Designation for LCWD1-35 CT

Key Features of LCWD1-35 (LABN1-35W2) Current Transformers

• L: Current transformer.
• C: Porcelain insulated.
• W: Outdoor type.
• D: Design sequence with protection class.
• 1: Design sequence.
• 35: Voltage grade for 35kV systems.

LCWD1-35 (LABN1-35W2) current transformers are robustly designed for outdoor use, featuring durable porcelain insulation and a customizable oil-immersed tank. They provide reliable performance in medium-voltage systems with specific adjustments available for dimensions, materials, and applications.

Service Conditions for LCWD1-35 Current Transformers

• Installation Location: Suitable for outdoor environments.
• Ambient Temperature:
  • Maximum: +40°C
  • Minimum: -25°C
• Altitude: Up to 1000 meters above sea level.
• Pollution Class: Available in Class II and Class III for enhanced resistance to environmental factors.
• Customization Options: Oil-immersed tanks can be tailored to meet specific service conditions, including unique dimensions, materials, and designs.

The LCWD1-35 current transformer is designed to deliver reliable performance in demanding outdoor environments, meeting a wide range of application needs. Its compact and durable design ensures long-lasting functionality, while the external metal casing can be fully customized to suit specific requirements, including dimensions, materials, and finishes, providing a tailored solution for diverse applications.

Construction of LCWD1-35 CT

The LCWD1-35 current transformer features a compact structure, small volume, and lightweight design. The transformer body undergoes vacuum drying treatment and is housed in a bushing filled with transformer oil to ensure optimal insulation and durability.

• Primary and Secondary Windings: The upper half of the bushing contains the primary winding, while the lower half contains the secondary winding.
• Mounting: The bushing is securely fixed to the pedestal for stability.
• Oil Storage Cabinet: Positioned at the top of the bushing, the oil storage cabinet is equipped with dials that display different temperatures and oil levels for monitoring and maintenance.
• Terminal Configuration:
  • The primary winding’s starting terminal (P1) is insulated from the cabinet wall using small porcelain bushings.
  • The terminal marked P2 is directly connected to the cabinet wall for efficient electrical connection.

Technical Data for LCWD1 35KV Current Transformer

1. Rated Insulation Level: 40.5/95/185kV.
2. Rated Secondary Current: 5A.
3. Rated Primary Current and Accuracy Classes: See specifications table.
4. Creepage Distance: ≥735mm (General), ≥1100mm (W2).
5. Parameter Selection: Please refer to the technical table.

Custom adjustments available upon request.

Rated Primary Current (A)	Accuracy Classed Combination	Related Output (VA)			Short-time Thermal Current (KA/S)	Rated Dynamic Current (I dyn) (KA)
		0.2S	0.5	10P20
5	0.5/10P15 0.5/10P15 0.2/0.5 0.2/0.2	30	50	50	0.375	0.95
10					0.75	1.9
15					1.12	2.9
20					1.5	3.8
30					2.25	5.7
40					3	7.6
50					3.75	9.6
75					5.62	14.5
100					7.5	19.2
200					11.25	28.7
300					15	38.3
400					22.5	57.5
600					30	76.5
800					45	115
1000					45	115
1200					45	115
1500					45	115

Accuracy limit ractor of class 10P

Installation Dimensions

LCWD1-35, LABN1-35W2 Compact Oil-Insulated CT Installation Dimensions

Spiral Rod Connection

Rated Primary Current (A)	M
5-500	M22 × 1.5
600-1000	M27 × 1.5
1200-1500	M30 × 1.5

Copper Bar Type Connection

Rated Primary Current (A) >	B
5-500	410
600-1000	440
1200-1500	440

Ordering Guidelines and Special Requirements

1. Type and Current Ratio: Specify transformer type and desired primary current rating.
2. Accuracy Class and Output: Indicate required accuracy class and secondary output specifications.
3. Insulation Level: Confirm insulation level and pollution class.
4. Customization: Provide details for custom dimensions, materials, design adjustments, or tailored oil tank and transformer casing.
5. Installation Requirements: Include ambient conditions and installation location.

Contact our team for tailored solutions, including customizable transformer casings and oil tanks.

• 3 Voltage Transformer Faults and Solutions: Ensuring Accurate Measurement and Protection
• Zero-Sequence Current Transformers vs. Standard Current Transformer
• Introduction to Combined Transformers and Their Classification
• Analysis of the Impact of Incorrect CT S1 and S2 Connections and Reversed Input Lines
• Causes of 35KV Current Transformer Damage
• Common Faults and Troubleshooting of Current Transformers Faults