Description of JLSZY-35Kv Combined Transformer

This high-voltage combined transformer, also referred to as a metering tank, is designed for three-phase circuits with AC 50Hz and a rated voltage of up to 35kV. It serves applications in voltage, current, and energy measurement, as well as protective relaying. The product is particularly suited for urban and rural outdoor transformer substations, as well as industrial enterprises.

Additionally, this model can integrate active and reactive energy meters for comprehensive monitoring, making it an ideal replacement for traditional oil-immersed combined transformers. Its epoxy resin insulation enhances durability, anti-aging performance, and resistance to ultraviolet radiation, ensuring long service life in diverse environments.

Type Designation of JLSZY-35Kv Combined Transformer

• J: Voltage transformer
• L: Current transformer
• S: Three-phase
• Z: Epoxy resin casting type
• Y: “Y” wiring mode
• □: Design serial number for outdoor epoxy resin casting models
• 35: Rated Voltage Class, KV

This type designation offers a clear breakdown of the functional and structural features of the JLSZY-35kV combined transformer.

Construction of JLSZY-35kV Combined Transformer

The JLSZY-35kV transformer features an outdoor epoxy resin casting type with a wholly-sealed and post-type mechanism. By adopting advanced epoxy resin casting, this transformer provides multiple advantages such as resistance to electric arcs, UV radiation, and aging, ensuring long service life.

Key construction details include:

• Voltage Transformers: Two single-phase, wholly insulated voltage transformers form a “V/V” wiring mode, ensuring robust insulation and operational reliability.
• Current Transformers: Two current transformers are separately connected to A and C phases, featuring secondary coils with taps to allow for various current-changing capabilities.

Technical Data for JLSZY-35kV Combined Transformer

1. The combined transformer complies with the provisions outlined in GB20840.4-2015 (“Combined Transformer”).
2. The current transformer adheres to GB20840.2-2014 and GB20840.1-2010 (“Current Transformer”).
3. The voltage transformer conforms to GB20840.3-2013 and GB20840.1-2010 (“Voltage Transformer”).
4. A zinc oxide arrester must be installed within one meter of the transformer’s installation location to ensure effective lightning protection.
5. For detailed PT and CT parameters, please refer to the following technical tables.

Voltage Transformer Technical Data

Type	Rated Voltage Ratio (V)	Accuracy Classes	Rated Output (vA)	Limit Output (vA)	Rated Insulation Level (kV)
JLSZY-35KV	35000/100	0.2	30	500	42/95/195
		0.5	50

Current Transformer Technical Data

Type	Rated Voltage Ratio (A)	Accuracy Classes	Rated Output (vA)	Rated Short-Time Thermal Current(kA)	Rated Dynamic Current (kA)	Rated Insulation Level (kV)
JLSZY-35	5~200/5	0.2S	10	100 I1n	2.5 I1th	42/95/195
		0.2	10

Note: For the JLSZY-35kV Combined Transformer, if you have specific requirements regarding transformer parameters such as current ratio, accuracy class, or customized dimensions, please contact our technical team. We offer tailored solutions to meet your unique operational and application needs.

Outline and Dimensions of Installation

JLSZY-35kV Combined Transformer Outline and Dimensions of Installation

When Ordering, Please Specify the Following

• Voltage and Current Ratios: Specify required CT and PT voltage/current ratios.
• Accuracy and Output: Indicate accuracy class (e.g., 0.2, 0.5) and secondary output.
• Insulation and Service Conditions: Provide insulation class and environmental details.
• Custom Design: Metering box appearance can be tailored for specific needs.
• Special Parameters: Contact us for customized CT/PT precision, ratios, or designs.

Technical FAQs for JLSZY-35kV Combined Transformer

1. What are the primary applications of the JLSZY-35kV transformer?
   The transformer is designed for voltage, current, and energy metering in 35kV three-phase systems, suitable for urban power grids, rural substations, and industrial enterprises.
2. How does the JLSZY-35kV ensure reliable outdoor performance?
   Its epoxy resin casting and sealed design provide superior resistance to UV radiation, aging, and pollution, ensuring stable operation in diverse environments.
3. Can the transformer be customized for unique requirements?
   Yes, customization options include voltage/current ratios, accuracy classes, transformer dimensions, and insulation enhancements tailored to specific needs.
4. What maintenance is required for the JLSZY-35kV transformer?
   Minimal maintenance is needed, primarily involving periodic surface cleaning and routine performance checks to ensure long-term reliability.
5. What safety measures are integrated into the JLSZY-35kV transformer?
   It supports the installation of zinc oxide arresters for effective lightning protection and complies with industry safety standards, ensuring operational security.
6. Why is the JLSZY-35kV preferred over traditional oil-immersed transformers?
   Its oil-free design reduces environmental risks, while the epoxy resin construction offers enhanced durability, reduced maintenance, and improved precision for modern power systems.

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