A Comprehensive Guide To Manganin Shunt For Electricity Meters: Types, Characteristics, And Selection Tips

Shunt units are crucial sensing elements for current sampling in electricity meters. Utilizing the low resistance of manganese-copper alloys, they achieve accurate current measurement by measuring the voltage drop as current flows. This is a cost-effective and versatile sampling solution for electricity meters. Manganin Shunt for Electricity Meter is the common English name for this component.

Currently, the industry classifies Electricity Meter Shunt units primarily based on welding processes, installation methods, structural specifications, and accuracy levels. Different types differ significantly in manufacturing processes, performance, and applicable scenarios.

Brazed Manganin Shunt

1. Process Features: The Manganin Shunt for Electricity Meter is welded to the copper connector using traditional solder, resulting in a simple process and low manufacturing cost.

2. Core Characteristics: There is a problem with heat generation in the solder layer; the Customizable Copper Manganin Shunt Resistors are prone to separation due to thermal expansion and contraction; the temperature coefficient is relatively high; resistance stability is generally poor; and lightning protection is weak.

3. Applicable Scenarios: Ordinary electricity meters and economical electricity meters with lower metering accuracy requirements. These scenarios have relatively relaxed performance requirements for the Shunt Assembly.

Electron Beam Welded Manganese-Copper Shunt

1. Process Features: Solder-free, manganese-copper, and copper connectors are fused using a high-temperature electron beam. This requires extremely high purity of both manganese-copper and copper materials, and involves stringent process precision.

2. Core Characteristics: Low temperature coefficient, virtually no resistance drift, no additional solder heating, and the Manganin Copper Shunts never separate. Easily compatible with 0.5-class electricity meters, and passes a 3000A/10ms lightning strike test. It exhibits superior oxidation resistance and overload resistance.

3. Applicable Scenarios: Medium to high power DC electricity meters (charging piles, photovoltaic), industrial-grade electricity meters, and outdoor electricity meters operating in wide temperature environments. It is currently the mainstream choice for integrated DC electricity meter shunts, and Customizable Copper Manganin Shunt Resistor Meter's high-end products largely utilize this process.

External split shunt
1. Structural characteristics: The Electrical Meter Shunt is independent of the electricity meter body and needs to be connected to the meter via a sampling line, requiring separate planning of installation space and wiring.

2. Core characteristics: To reduce long-distance sampling interference, Relay Resistor Shunt often uses 75mV/50mV high-voltage signal transmission, resulting in significantly higher power consumption and heat generation (power consumption reaches 22.5VA under 300A conditions); the metering error is a combination of the meter, shunt, and wiring process, resulting in a large uncertainty in the total error (a conventional 1.0 class meter + 0.5 class shunt can have a total error of ±1.5%), and weak resistance to electromagnetic interference.

3. Applicable scenarios: Early DC charging pile electricity meters, dual-gun DC charging piles, and energy storage metering scenarios with low installation space requirements. In these scenarios, the Customizable Copper Manganin Shunt Resistor is mostly an external split design.

Built-in Integrated Shunt

1. Structural Features: The Manganin Copper Shunt is directly integrated inside the meter body, eliminating the need for external sampling lines. Only external voltage and communication lines are required, simplifying wiring.

2. Core Characteristics: Employs 6mV low-voltage signal transmission, resulting in lower shunt resistance and power consumption only 1/12 that of separate shunt meters (only 1.8VA at 300A). Copper Manganin Shunt also features low heat generation and controllable temperature rise. The short and enclosed sampling link eliminates additional error accumulation, achieving metering accuracy up to 0.5 class (error ±0.5%). It boasts strong anti-interference capabilities and an integrated lead seal to prevent tampering.

3. Applicable Scenarios: Suitable for new single-gun DC charging pile meters, high-precision photovoltaic metering meters, and compact vehicle/small energy storage meters. This represents the technological iteration direction of DC meters, and the integration of the Manganin Shunt Resistor for Current Measurement is a significant current development trend.

Currently, the development trend of shunts in electricity meters is moving towards electron beam welding technology, integrated replacement of split types, high precision, low power consumption, and integration. Meanwhile, the application of new materials is further improving the temperature stability of shunts. Furthermore, the hybrid sampling scheme of shunts and current transformers is becoming a new direction for high-voltage and ultra-high-current electricity metering. The technological upgrades of the Electrical Meter Shunt will drive the development of the electricity metering industry.

We specialize in the R&D and production of manganin copper shunts for electricity meters. Our flagship Relay Resistor Shunt, featuring electron beam welding technology, covers all specifications, including built-in, integrated, and external separate types, with an accuracy of 0.5 class. It is suitable for all scenarios, such as charging piles, photovoltaics, and energy storage, and boasts advantages such as low power consumption, high interference immunity, and low temperature drift, perfectly meeting the industry's upgrade needs. Customized development is available upon request.

For high-performance Manganin Shunt for Electricity Meters suitable for different electricity meter scenarios, please contact us for consultation on selection and cooperation. Customized production is supported, and discounts are available for bulk orders!