JLS-10 Five-Column Pole-Mounted Oil-Immersed Combined Transformer Metering Box 10kV

Product Overview

The JLS-10 five-column combined transformer is a pole-mounted oil-immersed metering box designed for 10kV three-phase AC power networks. This integrated metering solution combines current transformer (CT), voltage transformer (PT), and meter box in a single oil-immersed assembly, providing accurate energy measurement for rural power distribution, small power stations, and industrial applications. The five-column design features two voltage transformers and two current transformers mounted on a support plate, immersed in transformer oil for superior insulation and heat dissipation.

Featuring dual ratio capability with V/V-12 connection method, the JLS-10 supports both single-phase and bidirectional metering configurations. The voltage transformer uses outer-iron core design with cold-rolled oriented silicon steel, while the current transformer uses inner-iron core design. The integrated meter box includes D86 series three-phase energy meters with observation window and lead seal holes for tamper-proof operation. Compliant with GB20840.4-2015 standards, this transformer is ideal for rural irrigation stations, township enterprises, small factories, mining operations, and small power station generation metering.

Product Display

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Application Position

The JLS-10 is installed on pole brackets or transformer platforms for overhead line metering. The five-column design with oil-immersed insulation provides excellent performance in outdoor environments. The integrated meter box is mounted on the tank front face with observation window for easy reading. Primary connections use porcelain bushings through conductive rods, while secondary terminals are accessible for meter connections. The tank includes oil drain plug and grounding bolt for maintenance and safety.

Main Applications

• Rural irrigation stations and agricultural power distribution
• Township enterprises and small processing factories
• Mining operations and industrial facilities with 10kV supply
• Transportation infrastructure power metering
• Forestry and construction site temporary power stations
• Small power station generation metering and grid interconnection
• Bidirectional energy flow measurement between small stations and grid

Application Case Studies

Application Scenario 1: Rural Power Distribution Metering
Rural irrigation stations and township enterprises deploy the JLS-10 five-column combined transformer on pole brackets for accurate energy billing. The compact five-column design with integrated meter box simplifies installation on existing pole structures. The oil-immersed insulation ensures reliable operation in harsh outdoor environments with temperature variations from -25°C to +40°C. The observation window allows utility personnel to verify meter readings without opening the sealed compartment.

Application Scenario 2: Small Power Station Generation Metering
Small hydro and thermal power stations use the JLS-10 for generation metering and grid interconnection measurement. The dual ratio capability with V/V-12 connection method supports bidirectional energy flow measurement when the station exports power to the grid. The secondary b-point grounding and A.C phase current secondary loop grounding ensure accurate measurement and safety compliance. The meter box can be configured with two active and two reactive energy meters for comprehensive bidirectional metering.

Application Fit

Suitable For

• Pole-mounted 10kV metering points in rural distribution networks
• Small power stations requiring generation and grid interconnection metering
• Industrial facilities with 10kV incoming supply and moderate load currents
• Applications requiring current range from 5A to 300A
• Projects requiring dual ratio capability for flexible metering configurations
• Bidirectional energy flow measurement applications
• Environments with ambient temperature -25°C to +40°C

Not Recommended For

• Indoor-only compact switchgear applications
• High-current applications exceeding 300A (use JLSY-10 for 800A range)
• Applications requiring three-phase three-component design
• Environments with severe pollution or corrosive atmosphere
• Systems requiring maintenance-free operation (oil-immersed requires periodic oil checks)

Installation Conditions

• Installation position: Pole-mounted on brackets or transformer platforms
• Ambient temperature: -25°C to +40°C (daily average not exceeding +30°C)
• Maximum altitude: ≤ 4500m
• System grounding: Non-effectively grounded neutral system
• Atmospheric conditions: No severe pollution in atmosphere
• Grounding: Secondary b-point and tank grounding bolt must be reliably grounded
• Maintenance: Periodic oil level check and oil quality inspection required

Technical Parameters

The JLS-10 is a pole-mounted oil-immersed five-column combined transformer for 10kV systems. Operating temperature -25°C to +40°C, altitude up to 4500m, compliant with GB20840.4-2015. Features five-column design with dual ratio capability, V/V-12 connection method, and integrated meter box.

Voltage Transformer Data

Current Transformer Data

Installation & Dimensions

Dimension Reference

Weight: Approximately 75kg

Wiring Diagram

Installation Guidelines

• Verify phase sequence before commissioning; if reversed, swap any two high-voltage conductors
• For two-phase-one-ground systems, connect ground to B-phase terminal
• Secondary b-point and tank grounding bolt must be reliably grounded
• CT secondary circuits must not be open-circuited during operation
• Use lifting lugs on tank for hoisting; do not use bushings for lifting
• Check oil level through inspection window before commissioning
• Ensure meter box lead seals are intact for tamper-proof operation

Dual Ratio Operation

The dual ratio metering box uses secondary ratio changeover method for flexible configuration. The V/V-12 connection method grounds the secondary b-point in voltage circuit and A.C phase current secondary loop tail ends. Inside the metering box, current secondary loop tail ends and voltage secondary b-point are connected together but not grounded. During meter installation, this common point (b) must be reliably grounded.

Standards Compliance

The JLS-10 five-column combined transformer complies with GB20840.4-2015 for combined instrument transformers, ensuring compatibility with Chinese standards for rural and industrial power metering applications.

Selection Guide

Select by voltage ratio: Choose 3000/100V, 6000/100V, or 10000/100V according to network voltage and meter input requirements.

Select by current ratio: Determine CT primary current according to actual load current. Supports 5A to 300A primary current range.

Select by metering configuration: Choose single ratio for standard applications or dual ratio for flexible metering configurations with ratio changeover capability.

Select by metering direction: Choose single-phase metering (one active + one reactive meter) or bidirectional metering (two active + two reactive meters) for small power station applications.

Ordering Information

When ordering the JLS-10 five-column combined transformer, please specify:

• Product model: JLS-10 (five-column type)
• Rated voltage ratio: 3000/100V, 6000/100V, or 10000/100V
• Rated current ratio: 5A to 300A (specify exact value)
• Accuracy class: 0.2S or 0.2 for CT; 0.2 or 0.5 for PT
• Usage environment: Outdoor pole-mounted
• Metering configuration: Single-phase or bidirectional metering
• Ratio type: Single ratio or dual ratio
• Quantity

FAQs