Description

The JLSZW outdoor epoxy resin cast combined transformer, also known as a metering tank, is designed for three-phase AC circuits at 50Hz with a rated voltage of 10kV-35kV. It provides voltage, current, and energy measurement, as well as protective relaying, making it ideal for urban and rural outdoor transformer substations, industrial enterprises, and various voltage transformation applications.

This high-voltage power metering tank integrates active and reactive energy meters, offering an eco-friendly alternative to traditional oil-immersed combined transformers. The product’s advanced epoxy resin casting ensures superior insulation, durability, and resistance to environmental factors, requiring minimal maintenance while delivering reliable performance.

JLSZW Type combined transformer Designation

The following is the model interpretation of the JLSZW series combined transformer:

• J: Voltage transformer
• L: Current transformer
• S: Three-phase
• Z: Epoxy resin casting type
• W: Outdoor device
• □: Design serial number, outdoor epoxy resin
• Rated Voltage Class (kV): Specifies the operating voltage level

This type designation provides a comprehensive explanation of the structural and functional features of the JLSZW outdoor epoxy resin cast combined transformer.

Construction of JLSZW Combined Transformer

This combined transformer utilizes outdoor epoxy resin casting with a wholly sealed and post-type structure. It is characterized by excellent resistance to electric arc, ultraviolet radiation, aging, and long service life.The product is composed of two single-phase, wholly insulated voltage transformers forming a “V/V” wiring mode, with two current transformers separately connected to the A and C phases. Additionally, the secondary coil of the current transformer features a tap, enabling variations in current.

Based on the three-phase two-component “V/V” wiring mode, the transformer can be upgraded to a three-phase, three-component “Y/Y” wiring mode, providing advanced functionality for high-voltage power metering applications.

Technical Data of JLSZW Combined Transformer

1. The metering tank conforms to the provisions of GB20840.4-2015 (combined transformer).
2. The current transformer complies with the standards GB20840.2-2014 and GB20840.1-2010 (current transformer).
3. The voltage transformer adheres to the standards GB20840.3-2013 and GB20840.1-2010 (voltage transformer).
4. A zinc oxide arrester must be installed at a position less than one meter away from the product’s installation point for lightning protection.

Outline and Dimensions of Installation

The JLSZW-6KV/10KV combined transformer adopts the “V/V” wiring mode, which features a three-phase, three-line, two-component configuration. This design is optimized for accurate power measurement and efficient energy management in high-voltage systems.

When Ordering, Please Specify the Following:

1. Type and Voltage Ratio: Specify the required transformer type and voltage ratio to match your application needs.
2. Accuracy Class and Secondary Output: Indicate the required accuracy class (e.g., 0.2, 0.5) and corresponding secondary load.
3. Insulation Class and Service Conditions: Provide information about the required insulation level and the environmental conditions for the transformer’s operation.

Technical FAQs for JLSZW Combined Transformer

1. What are the key applications of the JLSZW Combined Transformer?
   The JLSZW transformer is ideal for voltage, current, and energy metering in 10kV-35kV power systems, supporting urban and rural substations, industrial facilities, and voltage transformation applications.
2. How does epoxy resin casting enhance the transformer’s performance?
   Epoxy resin casting provides superior insulation, UV resistance, and protection against aging and environmental factors, ensuring long-term durability and minimal maintenance.
3. Can the JLSZW transformer be customized for specific requirements?
   Yes, it offers customization options for voltage ratios, accuracy classes, wiring configurations (V/V or Y/Y), and secondary outputs to meet unique operational needs.
4. What maintenance is required for the JLSZW Combined Transformer?
   The transformer requires minimal maintenance, primarily involving periodic inspections for cleanliness, operational integrity, and checks of safety features like zinc oxide arresters.
5. How does the JLSZW transformer ensure safety in high-voltage applications?
   The transformer supports zinc oxide arresters for lightning protection and complies with GB20840 standards, ensuring safe operation in demanding environments.
6. Why choose the JLSZW Combined Transformer over traditional models?
   Its eco-friendly design, advanced insulation, precise energy metering capabilities, and low maintenance requirements make it a cost-effective and reliable solution for modern high-voltage power systems.

• Zero-Sequence Current Transformer Protection Principle and Applications
• Error Analysis and Maintenance of Current Transformers in Power Systems
• Instrument Transformer Fault Handling: A Technical Guide
• Causes, and Solutions for Abnormal Heating in 10KV Current Transformers
• Number of Permissible Grounding Points in the Secondary Circuit of Voltage Transformers
• A Discussion on the Saturation Point of Current Transformers: Transformer Protection and Current Protection