LMZ(D)-0.66 LV Current Transformer | ZHNYU

The ZHNYU LMZ(D)-0.66 series represents a dependable line of low-voltage current transformers designed specifically for 50Hz and 60Hz AC power distribution systems. Operating at a rated insulation level of 0.66kV, this low voltage current transformer scales down high primary electrical currents into safe, proportional secondary outputs of 5A for connection to digital energy meters, analog ammeters, and protective relays.

ZHNYU manufactures every unit using a high-vacuum epoxy encapsulation technique. By completely sealing the internal copper windings and magnetic core within solid epoxy resin, ZHNYU blocks moisture, dust, and airborne contaminants from entering the assembly. This solid-dielectric construction removes the need for additional secondary insulation inside switchgear panels, ensuring long-term operational stability and zero routine maintenance after commissioning. Whether installed in compact multi-tenant sub-distribution boards or heavy industrial motor control centers, the ZHNYU epoxy resin current transformer adapts smoothly to varied electrical configurations.

Key Product Features

• Vacuum-Cast Epoxy Insulation: ZHNYU encapsulates all active winding components inside a high-vacuum chamber using epoxy resin, creating a solid dielectric barrier that resists moisture and environmental degradation.

• Five Comprehensive Frame Sizes: Spanning the LFZ1D compound-turn model and the bus-type LMZ1D through LMZ4D variants, ZHNYU accommodates round and rectangular busbar geometries effortlessly.

• Broad Accuracy Class Options: Available in Class 0.2, 0.2S, 0.5, 0.5S, and 1, meeting diverse commercial revenue billing and general load monitoring requirements.

• Flexible Rated Burden Ratings: Standard outputs range from 5 VA to 10 VA, with higher 15 VA configurations available for long secondary cable runs or multi-instrument setups using a reliable current transformer structure.

• Standard Regulatory Compliance: Fully aligned with GB1208 and Q/GDW572-2010 specifications, manufactured under strict ISO9001 and CE quality management systems.

Technical Advantages

Deploying a ZHNYU low voltage current transformer inside medium- and low-voltage installations brings significant engineering benefits. In standard distribution panels, engineers frequently encounter space limitations and varying primary conductor dimensions. The ZHNYU series resolves this by offering five distinct frame sizes, allowing panel builders to match window apertures directly to existing copper busbars without altering primary installation layouts.

Furthermore, electrical measurement accuracy is critical for revenue billing and grid management. The inclusion of Class 0.2S and 0.5S options ensures precise energy accounting even during low-load operating intervals. This technical capability prevents revenue leakage for utility operators and provides facility managers with reliable data streams for energy audits. Additionally, the solid epoxy resin current transformer design eliminates oil leakage hazards and reduces thermal drift over extended operational cycles.

Technical Specifications Table

Applications

• Utility Revenue Metering Points: Installed at the main utility interface to supply precise current signals to tariff meters, supported by Class 0.2S accuracy and strict adherence to grid measurement standards.

• Distribution Substations: Positioned on the low-voltage side of power transformers to feed panel-mounted ammeters and power analyzers for per-circuit energy tracking in commercial facilities using an epoxy resin current transformer.

• Switchgear Panel Manufacturing: Integrated into new panel builds and maintenance retrofits, where the bus-type current transformer slides onto copper bars seamlessly without breaking primary circuit continuity.

• Industrial Motor Feeders: Supplies proportional current signals to motor protection relays and programmable logic controllers, ensuring real-time overload monitoring and alarm triggers across factory branch circuits via a dependable low voltage current transformer.

Commercial Value & Engineering Support

Selecting the correct current transformer directly influences the accuracy of energy accounting and the safety of electrical protection networks. Inaccurate measurement leads to billing disputes, while inferior thermal endurance can cause hardware failure during high-current events. ZHNYU bridges this gap by combining precise manufacturing standards with comprehensive engineering support.

Before production begins, the technical team at ZHNYU assists clients in selecting the appropriate frame size and ratio based on busbar dimensions and load parameters, providing detailed dimension drawings for layout planning. Standard configurations ship efficiently within 7 to 12 working days, while custom accuracy classes and elevated burden combinations are fully supported for volume orders. Backed by a 12-month warranty against manufacturing defects, ZHNYU remains a trusted partner for electrical contractors and panel builders worldwide.

Frequently Asked Questions (FAQ)

Q1: What is the main difference between the LFZ1D model and the LMZ series current transformers?

A: The LFZ1D model utilizes a compound-turn construction optimized for lower primary current ratings, whereas the LMZ1D through LMZ4D units are bus-type designs featuring specific round or rectangular windows built to scale up to higher primary ratings like 3000A using a reliable low voltage current transformer configuration.

Q2: Can ZHNYU customize the rated burden for long secondary cable runs?

A: Yes. While standard rated burden ranges from 5 VA to 10 VA, ZHNYU accommodates higher output ratings such as 15 VA for volume orders where multiple instruments share a single current transformer circuit or cables are extended over long distances.

Q3: Are these current transformers suitable for utility revenue billing applications?

A: Yes. With accuracy classes including 0.2S and 0.5S and compliance with GB1208 and Q/GDW572-2010 standards, ZHNYU units satisfy the strict metrological requirements demanded by utility metering departments and commercial energy auditors.