LZZBJ9-10N Current Transformer Manufacturer

LZZBJ9-10N、H

Description

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Scope of Application

The heavy-duty LZZBJ9-10N and LZZBJ9-10H Series Indoor High Voltage Current Transformers are specifically engineered, precision-manufactured, and technically optimized for low-maintenance indoor AC electrical power systems operating with a rated primary network voltage of 10kV and an alternating current frequency of either 50Hz or 60Hz. This versatile, highly reliable equipment is mainly deployed for highly precise current measurement, official electrical energy revenue metering, and microcomputer-based integrated microprocessor relay protection systems within medium-voltage distribution networks. By establishing a secure, impenetrable, and dependable galvanic isolation barriers between the high-voltage primary grid conductors and the low-voltage secondary control circuits, it meticulously ensures maximum operational safety for both the on-site engineering maintenance personnel and the sensitive downstream electronic monitoring equipment.

The robust current transformer reliably converts high primary line current into a standardized, manageable secondary current output (typically 5A or 1A), consistently providing highly accurate, distortion-free electrical signals for analog measuring instruments, digital power meters, comprehensive power quality monitoring systems, and sophisticated programmable protection relays. Consequently, it is widely applied across power generation stations, transmission networks, urban distribution systems, heavy industrial manufacturing plants, commercial facility buildings, and utility substations worldwide.

Utilizing advanced automatic pressure gelation (APG) technology alongside premium-grade epoxy resin vacuum casting formulations, this compact, durable component delivers superior dielectric insulation strength, enhanced dynamic thermal stability limits, and exceptional mechanical insulation performance for long-term critical operations under severe electrical stress and overcurrent conditions. Its fully enclosed, maintenance-free cast-resin post-type structure provides reliable, robust environmental sealing, effectively protecting delicate internal copper windings and high-permeability magnetic alloy cores from severe conductive dust accumulation, ambient moisture, extreme humidity, and hazardous chemical atmospheric contaminants. This successfully guarantees unwavering signal transformation accuracy, optimal operational safety margins, minimized excitation core current losses, and seamless infrastructure integration into modern substation automation architectures and smart grids globally.

The product is perfectly suitable for direct installation in various types of medium-voltage metal-clad switchgear assemblies (such as the KYN28-12), compact ring main units (RMUs), gas-insulated switchgear (GIS), prefabricated compact substations, and other distribution equipment requiring highly reliable current measurement and fault protection. Engineered to strictly comply with rigorous international quality standards such as IEC 61869-2 and GB/T 20840.2, it offers excellent, ultra-low partial discharge performance under power frequency test voltages, minimal material degradation over its extended operational service life, and robust mechanical resistance against sudden short-circuit electromagnetic forces or unexpected grid current fluctuations.

Application Scenarios

LZZBJ9-10N Current Transformers are widely used in:

Medium-voltage air-insulated or gas-insulated switchgear assemblies

Ring Main Units (RMUs) for urban power supply networks

Compact and prefabricated substations

Power distribution substations for residential and utility sectors

Industrial power distribution systems (chemical plants, steel mills, mining)

Commercial building electrical systems and data centers

Utility distribution networks requiring high operational reliability

Renewable energy distribution systems (wind power and solar PV plants)

Step-up and step-down transformer substations

Electrical metering systems for revenue billing and energy auditing

Complex relay protection and automation control systems

Smart grid monitoring and feeder automation applications

These current transformers provide highly reliable, linear, and well-insulated current signals for monitoring, protection, automation, and intelligent energy management systems.

Normal working conditions

To ensure reliable performance and service life, the current transformer shall be operated under the following conditions:

Ambient temperature: -5°C to +40°C

Average temperature over 24 hours shall not exceed +35°C

Installation altitude: not exceeding 1000m above sea level

Indoor installation only

Relative humidity:

Daily average ≤ 95%

Monthly average ≤ 90%

Atmospheric environment shall be free from excessive dust, corrosive gases, salt contamination, or chemical pollutants

No severe vibration, impact, or frequent mechanical shock

No fire, explosion hazards, or conductive dust

Installation location shall provide adequate ventilation

For special operating conditions such as high altitude, extreme temperatures, or heavily polluted environments, customized solutions may be available upon request.

Structural features

LZZBJ9-10N adopts advanced epoxy resin casting technology and features a fully enclosed insulation structure, ensuring excellent electrical performance and long-term reliability.

Main features include:

High-quality epoxy resin cast insulation for superior dielectric strength

Fully enclosed structure resistant to moisture, dust, and contamination

Compact design with reduced installation space requirements

High measurement accuracy and stable operating performance

Suitable for both metering and protection applications

Excellent thermal and dynamic current withstand capability

Strong mechanical strength and impact resistance

Low partial discharge level for enhanced insulation reliability

Maintenance-free operation throughout service life

Long operational life with minimal performance degradation

Easy installation and integration into switchgear systems

Compliance with IEC and GB standards

The product provides reliable electrical isolation between primary and secondary circuits, ensuring safe operation of measuring instruments and protection devices.

Product Model and Its Meaning
LZZBJ9-10N、H