JDJ2-35 and JDJJ2-35 Voltage Transformer Overview

The JDJ2-35 and JDJJ2-35 (JDXN2-33, JDN2-33) voltage transformers are single-phase, outdoor oil-immersed devices designed for 35kV AC power systems operating at 50Hz or 60Hz. These transformers are used for energy metering, voltage monitoring, and relay protection. Built with a three-column laminated silicon steel core, their robust oil tank structure includes primary and secondary bushings, grounding bolts, and an oil drain plug. The JDJJ2-35 features a three-coil design, making it ideal for accurate voltage measurement and protection in demanding outdoor environments.

Detailed specifications, including wiring diagrams, voltage ratios, and accuracy levels, can be found in the sections below or by contacting us directly.

Type Designation for JDJ 2& JDJJ2-35 PT

Key Features of JDJ2-35 and JDJJ2-35 Voltage Transformers:

• J: Voltage transformer.
• D: Single-phase design.
• J : Oil filled
• (J): Ground protection
• 2: Design sequence.
• 35: Rated voltage of 35kV.
• Oil Filled: Durable oil-immersed construction.

This designation highlights the JDJ2-35 and JDJJ2-35 transformers’ suitability for accurate voltage measurement, energy metering, and relay protection in 35kV systems.

Service Conditions for JDJ2, JDJJ2 Voltage Transformers

• Altitude: Not exceeding 2500m.
• Ambient Temperature: -25°C to +40°C.
• Relative Humidity: Up to 85% at 20°C.
• Installation Environment: Outdoor locations free from conductive dust and corrosive gases.

These conditions ensure reliable performance and durability in a wide range of outdoor environments.

Construction Details of JDJJ2-35 Voltage Transformers

The JDJ2-35, JDJJ2-35 voltage transformer features a robust construction designed for reliable performance in outdoor environments:

• Core Design: The core is made of laminated silicon steel sheets in a three-column structure, with the central column housing three windings: primary, secondary, and residual windings.
• Body Structure: The active part is secured to the tank cover with iron clamps. The tank cover includes primary and secondary bushings, ensuring secure connections.
• Oil Tank: The oil tank, welded from steel plates, is equipped with grounding bolts and an oil drain plug at the lower wall, and four mounting holes at the base for secure installation. The body is fixed to positioning pins inside the oil tank for stability.
• Oil Conservator: The oil conservator includes an oil gauge, and the oil tank may be square or cylindrical in shape. The conservator connects the primary wire through porcelain bushings.

This design ensures durability, effective insulation, and stable operation in demanding outdoor conditions.

Technical Data for JDJ2-35 Voltage Transformers

• Standards Compliance: Conforms to GB1208-1997 and IEC186 standards.
• Rated Insulation Level: 40.5/95/200kV.
• Rated Voltage Ratio and Output: Refer to the technical data table for details.

Type	Rated Voltage Ratio (V)	Rated Output (VA)				Limit Output (VA)
		0.2	0.5	1	6P
JDJ2-33	33000/100	50	100	150	–	1000
JDJJ2-33	33000/√3 /100/√3 /100/3	50	100	150	100	2 × 500
JDJJ2-33	33000/√3 /100/√3 /100/√3 /100/3	30	60	–	100	2 × 500

Outline and Dimensions of Installation

JDJ2-35 Voltage Transformers Overall Dimensions

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JDJJ2-35 (JDNX2-33) Voltage Transformers Overall Dimensions

Notice: During operation, the secondary winding must not be short-circuited or overloaded.

Ordering Guidelines and Special Requirements

When placing an order for JDJJ2-35 Voltage Transformers, please specify the following details:

1. Product name and model.
2. Rated voltage ratio and operating environment.
3. Any special requirements for custom designs or specifications.

For unique needs, our team can provide tailored solutions to meet your operational demands.

FAQs for JDJ2-35 and JDJJ2-35 Voltage Transformers

1. What are the key applications of the JDJ2-35 and JDJJ2-35 Voltage Transformers?
   These transformers are primarily used for energy metering, voltage monitoring, and relay protection in 35kV AC power systems, ideal for both urban and rural power distribution networks.
2. What are the main differences between the JDJ2-35 and JDJJ2-35 models?
   The JDJ2-35 is a single-phase transformer, while the JDJJ2-35 features a three-coil design, providing additional residual windings for enhanced protection against faults.
3. How does the oil-immersed design enhance transformer performance?
   The oil-immersed design ensures superior insulation, cooling, and resistance to environmental factors like moisture and temperature fluctuations, improving overall reliability.
4. Can the JDJ2-35 and JDJJ2-35 Voltage Transformers be customized?
   Yes, both models offer customization options for voltage ratios, accuracy classes, and secondary outputs to meet specific application requirements.
5. What maintenance is required for the JDJ2-35 and JDJJ2-35 Voltage Transformers?
   These transformers require minimal maintenance, which includes periodic checks of the oil levels, cleaning of external surfaces, and ensuring the oil conservator is functioning properly.
6. What safety features do the JDJ2-35 and JDJJ2-35 Voltage Transformers have?
   Both models feature integrated grounding protection, oil conservators with oil gauges, and an oil drain plug to ensure safety during operation and ease of maintenance.

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