Product Overview

The JLS-24/33/35/40.5 oil-immersed metering box is a three-phase four-wire high-voltage measurement device designed for 24kV, 33kV, 35kV, and 40.5kV high-voltage distribution systems. This integrated metering solution combines current transformer (CT), voltage transformer (PT), and watt-hour meter box in a single oil-immersed assembly, providing complete energy metering for outdoor substations and high-voltage distribution networks.

Featuring 25# transformer oil insulation with porcelain bushings for primary and secondary connections, the JLS series delivers high-accuracy measurement with anti-theft design. The integrated watt-hour meter box includes active and reactive energy meters, offering a complete metering solution with high precision, lightweight construction, and convenient installation for high-voltage applications.

Product Display

JLS-24/33/35/40.5 Product Display - Harsh Outdoor Conditions

Application Position

The JLS-24/33/35/40.5 is installed outdoors on poles, in substations, or at distribution points. The oil-immersed construction provides excellent insulation and heat dissipation for high-voltage applications, while the integrated meter box eliminates the need for separate metering equipment. The porcelain bushings ensure reliable primary and secondary connections in harsh outdoor environments.

Main Applications

24kV, 33kV, 35kV, and 40.5kV outdoor distribution networks
High-voltage substations requiring integrated metering
Industrial facilities with 24kV/33kV/35kV/40.5kV incoming supply
Utility revenue metering applications
Three-phase four-wire power systems
Projects requiring anti-theft metering solutions
Distribution networks with GB17201 compliance requirements

Application Case Studies

Application Scenario 1: High-Voltage Utility Distribution Metering
Power utilities deploy the JLS-24/33/35/40.5 metering box at high-voltage distribution points for revenue billing and load monitoring. The integrated design combines CT, PT, and meter box in one unit, reducing installation complexity and maintenance costs. The anti-theft features ensure accurate billing data integrity for high-voltage applications.

Application Scenario 2: Industrial High-Voltage Substation Metering
Industrial facilities with 24kV, 33kV, 35kV, or 40.5kV incoming supply require comprehensive energy measurement for cost allocation. The JLS series provides complete metering solution with active and reactive energy measurement, supporting power factor monitoring and energy management systems in high-voltage environments.

Application Fit

Suitable For

Outdoor 24kV, 33kV, 35kV, and 40.5kV metering points
High-voltage substations with integrated metering requirements
Industrial facilities with three-phase four-wire systems
Utility revenue metering applications
Projects requiring anti-theft metering solutions
Distribution networks with GB17201 compliance
Applications requiring complete metering solution in one unit

Not Recommended For

Indoor-only compact switchgear applications
Medium-voltage systems below 24kV (use JLS-10/11/12 series)
Applications requiring separate CT and PT installations
Single-phase metering applications
Environments requiring maintenance-free operation

Installation Conditions

Installation position: Outdoor pole-mounted, substation, or distribution points
Ambient temperature: -25°C to +40°C
Rated frequency: 50Hz or 60Hz
Pollution class: IV level
Insulation: Oil-immersed with 25# transformer oil
Grounding: Connect grounding terminal per local electrical codes
Maintenance: Periodic oil level check and meter calibration required

Technical Parameters

The JLS-24/33/35/40.5 is an outdoor oil-immersed metering box for 24kV, 33kV, 35kV, and 40.5kV systems with three-phase four-wire design. Operating temperature -25°C to +40°C, compliant with GB17201 standards. Features oil-immersed insulation, porcelain bushings, integrated meter box, and anti-theft design.

Model Variants

Model	System Voltage	Voltage Ratio	Insulation Level (kV)	Application
JLS-24	24kV	24000/100V	24/50/125	International 24kV systems
JLS-33	33kV	33000/110V	40.5/95/185	International 33kV systems
JLS-35	35kV	35000/100V	40.5/95/185	Chinese standard 35kV systems
JLS-40.5	40.5kV	40500/100V	40.5/95/185	International 40.5kV systems

Voltage Transformer Data

Accuracy Class	Rated Output	Application
0.2	50 VA	High-precision metering
0.5	25 VA	Standard metering

Current Transformer Data

Rated Current Ratio	Accuracy Class	Rated Output
5 – 300/5	0.2S	10 VA
5 – 300/5	0.5S	10 VA

Installation & Dimensions

Dimension Reference

JLS-24/33/35/40.5 Installation Diagram

Component	Key Dimensions	Application Note
Main Unit	Standard outdoor metering box size	Pole-mounted or pad-mounted installation
Meter Box	Side-mounted compartment	Active and reactive energy meters
Bushings	Porcelain insulated	Primary and secondary connections

Wiring Diagram

JLS-24/33/35/40.5 Wiring Diagram

[Wiring diagram to be added]

Installation Guidelines

Confirm voltage ratio and current ratio before installation
Connect primary terminals (AP1, AP2, CP1, CP2) to high-voltage lines
Connect secondary terminals to meter box inputs
Ensure proper grounding of metal enclosure
Check oil level through inspection window before commissioning
Verify meter calibration and accuracy class compliance

Standards Compliance

The JLS-24/33/35/40.5 metering box complies with GB17201 for high-voltage electric measuring tanks. For international projects, compliance should be aligned with applicable IEC standards and local utility metering requirements.

Selection Guide

Select by system voltage: Choose JLS-24 for 24kV systems, JLS-33 for 33kV systems, JLS-35 for 35kV systems, or JLS-40.5 for 40.5kV systems according to network voltage.

Select by voltage ratio: Choose 24000/100V for JLS-24, 33000/110V for JLS-33, 35000/100V for JLS-35, or 40500/100V for JLS-40.5 according to 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 accuracy class: Use 0.2S for high-precision revenue metering. Use 0.5S for standard metering applications.

Ordering Information

When ordering the JLS-24/33/35/40.5 metering box, please specify:

Model: JLS-24, JLS-33, JLS-35, or JLS-40.5
System voltage: 24kV, 33kV, 35kV, or 40.5kV
Voltage ratio: 24000/100V, 33000/110V, 35000/100V, or 40500/100V
CT primary current: 5A to 300A (specify exact value)
CT secondary current: 5A
CT accuracy class: 0.2S or 0.5S
PT accuracy class: 0.2 or 0.5
Wiring type: Single ratio or double ratio
Quantity

FAQs

The JLS-24/33/35/40.5 metering box is an outdoor oil-immersed high-voltage metering solution for 24kV, 33kV, 35kV, and 40.5kV high-voltage distribution systems. It integrates CT, PT, and watt-hour meter box in one unit, providing complete energy metering with active and reactive measurement for utility billing and industrial applications.

JLS-24 is designed for 24kV systems with 24000/100V ratio and 24/50/125kV insulation. JLS-33 is for 33kV systems with 33000/110V ratio and 40.5/95/185kV insulation. JLS-35 is for 35kV systems (Chinese standard) with 35000/100V ratio and 40.5/95/185kV insulation. JLS-40.5 is for 40.5kV systems with 40500/100V ratio and 40.5/95/185kV insulation. All models share the same current range (5-300/5A).

Higher insulation levels (40.5/95/185kV) provide enhanced safety margins for high-voltage applications, ensuring reliable operation under transient overvoltages and harsh environmental conditions. This is critical for 33kV, 35kV, and 40.5kV systems where electrical stresses are significantly higher than medium-voltage applications.

Oil-immersed metering boxes require periodic oil level checks through the inspection window and oil quality inspection. The oil drain port allows for oil replacement when needed. Porcelain bushings should be inspected for cracks or contamination. Energy meters require periodic calibration to maintain accuracy.

The anti-theft design includes sealed meter box compartment with tamper-evident seals, secure terminal connections, and protected meter access. These features prevent unauthorized access to metering equipment and ensure billing data integrity for utility revenue protection.

CT accuracy classes include 0.2S and 0.5S. PT accuracy classes include 0.2 and 0.5. Use 0.2S for high-precision revenue metering applications. Use 0.5S for standard metering applications.

Single ratio wiring uses one current ratio for all phases. Double ratio wiring uses two different current ratios: large current ratio connects to AP1, AP2 and CP1, CP2; small current ratio connects to AP1, AP3 and CP1, CP3. Double ratio provides flexibility for different load conditions.

Confirm model (JLS-24, JLS-33, JLS-35, or JLS-40.5), system voltage, voltage ratio, CT primary current, CT secondary current, accuracy classes, wiring type (single or double ratio), and quantity.

JLS-24/33/35/40.5 Oil-Immersed Combined Transformer Metering Box 24kV 33kV 35kV 40.5kV