Product Overview
The JLSZV2-6/10W is an outdoor cast three-phase combined metering instrument transformer. It integrates current transformer (CT) and voltage transformer (PT) into one compact unit. Its primary rated voltage is 6/10kV, voltage ratio 10000/100V, with current range covering 5A to 300A. Adopting outdoor anti-pollution insulation structure, it is directly pole-mounted for 10kV distribution lines, serving as an all-in-one sampling device for energy metering and electrical monitoring on 10kV overhead networks.
Functions
- Energy Metering (Core Function) It synchronously samples high-voltage current and voltage signals, and converts them into standard low-voltage signals at a precise transformation ratio. The output signals are sent to high-voltage meters and multi-functional energy meters for active and reactive energy settlement at grid boundary points and industrial & commercial transformer user sites. It meets the accuracy requirements for trade metering.
- Electrical Parameter Monitoring It provides voltage and current sampling signals for distribution automation terminals such as FTU and DTU. Operators can remotely monitor real-time line load, three-phase current balance and line voltage status through back-end systems.
- Sampling for Relay Protection (Optional) Versions with protection-class secondary windings are available on request. It supplies sampling signals for simple over-current and over-voltage protection devices, cooperating with switches to trigger fault alarms and tripping and prevent fault expansion.
Note: This model is mainly designed for metering. Protection windings are optional and cannot replace dedicated protection transformers.
- Electrical Isolation & Safety Protection It establishes reliable insulation isolation between the 10kV high-voltage circuit and secondary instruments and metering equipment. It blocks high voltage from leaking into low-voltage loops and protects field operators and secondary devices from electric hazards.
Application Scenarios
- 10kV outdoor overhead distribution lines and pole-mounted metering points for rural grid renovation
- High-voltage energy settlement for industrial, mining, breeding and other commercial & industrial transformer users
- Boundary metering points for grid connection of distributed photovoltaic power stations and small hydropower stations (bidirectional metering)
- Distribution automation upgrading projects, matched with pole-mounted switches for voltage & current sampling
- Distribution areas in industrial parks and townships, and outdoor metering branches outside small substations
It is suitable for open-air installation with rain, dust and light pollution. It is an ideal alternative to separately installed standalone CT and PT, reducing the quantity of pole-mounted equipment where no switchgear room is available.
Product Comparison & Advantages
Most JLSZV2-6/10W combined transformers on the market can satisfy basic national standard requirements for insulation and metering and realize 10kV line metering. The core functions are similar among different suppliers, while differences lie in material selection, structural design and long-term operational stability.
- Insulation & Weather Resistance Many conventional products use general epoxy resin casting formula for normal clean service areas. Dahu Electric’s unit adopts modified outdoor weather-resistant epoxy system with added anti-UV and anti-ageing fillers. It resists powdering, cracking and surface crazing under long-term outdoor exposure. It has a higher pollution resistance class and maintains stable service life in coastal salt-fog zones and mountainous areas with heavy condensation.
- Consistent Metering Accuracy Some competing products tend to suffer error drift under fluctuating heavy load and wide temperature variation. Every Dahu Electric transformer is calibrated for error under high and low temperature conditions. High-purity oxygen-free copper wire and low-loss cold-rolled silicon steel core are applied. Even within the full measuring range (5%~120% rated current), error remains well-controlled, lowering the risk of metering disputes.
- Structure & Installation Compatibility Most manufacturers offer limited mounting hole options. Dahu Electric optimizes the base structure with standardized interfaces compatible with mainstream 10kV pole clamps. The secondary terminal box is equipped with integrated waterproof gaskets and sealed outlets to stop moisture and rainwater from entering secondary windings, which helps avoid short circuits and insulation degradation. On-site installation and commissioning become much easier.
- Flexible Parameter Customization Many suppliers only stock common current ratios and have long lead times for special specifications. Dahu Electric supports stable delivery covering the full 5A–300A current range. We can also adjust accuracy class, add protection windings and change secondary output capacity to match technical specifications from State Grid, China Southern Power Grid, industrial mines and photovoltaic projects.
- Factory Test & Traceability Some manufacturers only implement sampling inspection. Dahu Electric carries out full-item testing for every single unit before delivery, including ratio error test, power frequency withstand voltage test, partial discharge test and insulation resistance test. Each unit comes with an independent test report with traceable data for project acceptance and filing.
About Dahu Electric
Dahu Electric, based in Yueqing, is a professional manufacturer specializing in R&D, production and sales of high-voltage instrument transformers and combined metering transformers. We focus on the 10kV ~ 35kV distribution transformer sector for years. Our factory owns independent casting workshops and high-precision metering laboratories, equipped with complete test facilities for transformer error, partial discharge and high voltage withstand tests. All products comply with GB/T 20840 series national standards. Our product portfolio covers indoor and outdoor cast combined transformers, standalone CT/PT and zero-sequence transformers. Our products are widely adopted in grid renovation, industrial transformer projects, new energy photovoltaic and hydropower grid-connection projects.
At Dahu Electric, stable metering, outdoor durability and reliable delivery are our core priorities. We never cut corners on key raw materials. Quality control starts from silicon steel cores, copper conductors, insulating compounds and sealing structures. Our technical team supports drawing confirmation and on-site technical consultation. We supply reliable transformer solutions for complete-set electrical manufacturers, electrical contractors and grid service providers. We keep upgrading our outdoor transformers for better anti-ageing, anti-condensation and anti-salt-fog performance. We deliver high-stability high-voltage sampling equipment and work closely with all partners to guarantee accurate metering and safe operation of distribution networks.
