Product Overview
The JLSW3-33kV outdoor horizontal oil-immersed high-voltage metering tank is a combined transformer metering device designed for outdoor power distribution and 35kV-class transmission line metering applications. The product integrates voltage transformers and current transformers in one oil-immersed tank, providing voltage and current signals for electric energy metering, power monitoring, and utility settlement measurement.
This model is designed as a horizontal outdoor oil-immersed structure. The metering tank body is arranged in a low-profile horizontal layout, with porcelain bushings mounted on both sides of the tank for three-phase incoming and outgoing line connection. Compared with vertical structures, the horizontal tank layout provides a stable installation form for outdoor pole-mounted or platform-mounted applications, while maintaining sufficient insulation distance, oil insulation space, and convenient external wiring.
Product Type
| Item | Specification |
|---|---|
| Product name | Outdoor Horizontal Oil-Immersed High-Voltage Metering Tank |
| Model series | JLSW3-33 |
| Rated voltage class | 33kV, suitable for 35kV-class power systems |
| Product structure | Outdoor horizontal oil-immersed combined transformer |
| Wiring system | Three-phase three-wire / three-phase four-wire according to project requirement |
| Integrated components | Voltage transformer units and current transformer units |
| Installation location | Outdoor |
| Typical applications | High-voltage electric energy metering, line metering, substation metering, rural and industrial distribution metering |
Product Display
Main Applications
- Outdoor 33kV and 35kV-class power distribution systems
- High-voltage line electric energy metering
- Rural outdoor transformer substations and distribution points
- Industrial and enterprise substation metering systems
- Power supply bureau, utility metering, and settlement measurement applications
- Outdoor pole-mounted or platform-mounted metering installations
- Current, voltage, active energy, and reactive energy measurement circuits
Key Technical Features
- Horizontal oil-immersed structure: The tank adopts a horizontal layout suitable for outdoor installation, providing a stable structure, compact height, and convenient line connection.
- Combined VT and CT design: The product integrates voltage transformers and current transformers in one metering tank to provide voltage and current signals for high-voltage metering.
- Outdoor insulation performance: Oil-immersed insulation provides dielectric strength and heat dissipation for 33kV / 35kV-class outdoor operating conditions.
- High-accuracy metering: Accuracy classes such as 0.2S and 0.5S can be selected according to utility metering or project settlement requirements.
- Weather-resistant construction: The outdoor tank, porcelain bushings, sealing structure, grounding terminal, and oil-level components are designed for outdoor service conditions.
- Anti-tamper metering option: The metering tank can be used with external energy meters and anti-electricity-theft metering enclosures for utility management applications.
Working Principle
The JLSW3-33 metering tank combines current transformer and voltage transformer functions. The current transformer section converts high primary current on the line into a standardized secondary current signal, while the voltage transformer section converts high primary voltage into a standardized secondary voltage signal. These secondary signals are supplied to the connected electric energy meter, measuring instrument, or monitoring device for energy metering and line measurement.
The oil-filled tank provides insulation and heat dissipation for the internal electromagnetic components. The horizontal structure supports outdoor installation and keeps the high-voltage bushings arranged on both sides of the tank, allowing the primary line conductors to be connected through the external porcelain insulators.
Model Designation
The model code can be interpreted as follows:
| Code | Meaning |
|---|---|
| J | Voltage transformer / metering transformer category |
| L | Current transformer component |
| S | Three-phase system |
| W | Outdoor device / horizontal outdoor structure |
| 3 | Design sequence number |
| 33 | Rated voltage class: 33kV |
Technical Data
| Item | Specification |
|---|---|
| Rated voltage | 33kV, suitable for 35kV-class systems |
| Highest voltage for equipment | 40.5kV, subject to project specification |
| Rated frequency | 50Hz / 60Hz |
| Rated current range | 5A to 300A, or customized according to project requirement |
| Accuracy class | 0.2S, 0.5S, 0.5, 1.0 according to metering requirement |
| Insulation type | Oil-immersed insulation |
| Structure | Outdoor horizontal combined transformer tank |
| Transformer components | Current transformer units and voltage transformer units |
| Installation method | Outdoor pole-mounted, frame-mounted, or platform-mounted installation |
| Applicable standards | GB/T 20840.1, GB/T 20840.2, GB/T 20840.3, GB/T 20840.4; project-specific requirements can be confirmed by agreement |
Metering Accuracy and Electrical Parameter Reference
| Parameter | Reference Value | Remark |
|---|---|---|
| Rated voltage class | 33kV | For 35kV-class outdoor metering systems |
| Highest system voltage | 40.5kV | Subject to final technical agreement |
| Rated current | 5A–300A | Custom ratio available according to line current |
| Accuracy class | 0.2S / 0.5S / 0.5 / 1.0 | Selected according to metering or settlement requirement |
| Rated frequency | 50Hz / 60Hz | According to project power system |
| Insulating medium | Transformer oil | Oil-immersed insulation and heat dissipation |
Note: Final voltage ratio, current ratio, output, accuracy class, insulation level, and test requirements should be confirmed by technical agreement before production.
Service Conditions
- Installation location: outdoor
- Applicable system: 33kV / 35kV-class AC power system
- Rated frequency: 50Hz / 60Hz
- The product should be installed in an outdoor location with sufficient electrical clearance and grounding conditions.
- The installation foundation, pole frame, or platform should support the tank weight and mechanical stress from connected conductors.
- Surge arrester or lightning protection device should be installed according to project design and local power system requirements.
- For high altitude, heavy pollution, coastal environment, low-temperature area, or special seismic requirements, technical confirmation is recommended before ordering.
Standards and Compliance
The JLSW3-33 outdoor oil-immersed high-voltage metering tank can be supplied according to the relevant GB/T 20840 series requirements for instrument transformers and combined transformers, including GB/T 20840.1, GB/T 20840.2, GB/T 20840.3, and GB/T 20840.4. Project-specific requirements for current transformer, voltage transformer, combined transformer, routine testing, and type testing should be confirmed in the technical agreement.
Installation and Dimensions
The JLSW3-33 adopts a horizontal outdoor oil tank structure. The tank body is installed horizontally, and the high-voltage porcelain bushings are arranged on both sides for incoming and outgoing line connection. This structure is suitable for outdoor pole-mounted frame installation or platform installation where stable mechanical support, high-voltage clearance, oil-level inspection, and grounding connection are required.
Horizontal Structure and Installation Reference
| Item | Reference Description |
|---|---|
| Tank structure | Horizontal oil-immersed metering tank |
| Installation method | Outdoor pole-mounted frame, bracket, or platform installation |
| Bushing arrangement | Porcelain bushings arranged on both sides of the tank for three-phase line connection |
| Access components | Oil level indicator, grounding terminal, oil drain / oil filling component according to product design |
| Lightning protection | Surge arrester installation recommended according to power system design |
Overall Dimensions Reference
| Dimension Item | Reference Value | Remark |
|---|---|---|
| Overall length | 1580±20 mm | Subject to final drawing |
| Tank body length | 1180 mm | Subject to final drawing |
| Tank body height | 720 mm | Subject to final drawing |
| Width reference | 1130±30 mm | Including bushing arrangement |
| Insulator spacing reference | 500±20 mm | Subject to phase arrangement and final drawing |
Unit: mm. Final dimensions, mounting holes, lifting points, and bushing positions are subject to the approved outline drawing.
Installation and Safety Notes
- Check the model, rated voltage, current ratio, voltage ratio, accuracy class, insulation level, and wiring diagram before installation.
- Confirm that the horizontal tank is securely mounted on the outdoor bracket, pole frame, or platform.
- Verify oil level, sealing condition, porcelain bushing condition, grounding terminal, and external fasteners before energizing.
- Install surge arresters and lightning protection devices according to the project design.
- The tank body must be reliably grounded before operation.
- Maintain sufficient phase-to-phase and phase-to-ground electrical clearance during installation.
- Installation, testing, and maintenance should be performed by qualified high-voltage electrical personnel.
Ordering Information
Please provide the following information when ordering or requesting a quotation:
- Product model: JLSW3-33
- Rated voltage class and highest system voltage
- Current transformer ratio and voltage transformer ratio
- Accuracy class, such as 0.2S, 0.5S, 0.5, or 1.0
- Rated frequency: 50Hz or 60Hz
- Wiring method: three-phase three-wire or three-phase four-wire
- Installation method: pole-mounted, bracket-mounted, or platform-mounted
- Outdoor environmental requirements, such as altitude, pollution level, humidity, temperature, and lightning protection conditions
- Quantity, drawings, routine test reports, certificates, nameplate requirements, and packaging requirements
Selection Guidelines
- Confirm voltage class: Select JLSW3-33 for 33kV / 35kV-class outdoor metering applications.
- Confirm system current: Select the CT ratio according to the normal line current and metering range.
- Confirm voltage ratio: Select the VT ratio according to the system voltage and connected meter requirement.
- Select accuracy class: Use 0.2S or 0.5S for high-accuracy utility settlement metering applications.
- Confirm installation type: Use the horizontal structure when outdoor pole-mounted or platform-mounted installation requires lower overall height and stable tank support.
- Check protection arrangement: Confirm surge arrester, grounding, oil level inspection, and lightning protection requirements before installation.
- Confirm drawings: Verify outline dimensions, bushing positions, mounting holes, and lifting points before production.
FAQs