ARH Series
Unique, IP57, flexible split-core AC current sensor implementing high temperature resistance
High temperature resistant Rogowski coil for electronic measurement
The ARH series is a flexible clip-around Rogowski coil designed for electronic measurement of AC current, providing galvanic separation between the primary (power) and secondary (measurement) circuits.
Its patented Perfect Loop Technology reduces measurement errors related to conductor position within the aperture and the influence of nearby external conductors.
With an operating temperature range up to 105?°C (and up to 125?°C in direct contact), the ARH series is the ideal solution for current measurement in low voltage energy distribution boards in warm environments, or with the coils directly in contact with the busbars.
The Rogowski coil technology in this product series is intended for both industrial and smart grid applications.
ARH – Features and benefits
Features
- Extended temperature range: up to 105 °C operating temperature and 125 °C in direct contact with busbar
- Class 0.5 (IEC 61869-10)
- Very low positioning error
- UL and IEC 61010
- UL 2808
- Very thin primary sensor (8 mm)
- Small external fields influence
- 22.5 mV/kA sensitivity to have a very thin coil.
- Excellent solution for indoor application
- Electrostatic shield included for better common mode rejection of the integrator
- Protection degree IP57
- ? 70 mm minimum sensing aperture
- 1 m output cable length (further lengths upon request)
Benefits
- Can be installed in contact with the busbar without additional accessories
- Fast and easy installation with no need to dismount the busbars
- High accuracy
- Excellent immunity to electromagnetic interferences.
Typical applications of ARH Rogowski coils
The ARH sensor series can be used in a wide range of applications in the smart grid, including:
- Retrofit of low voltage switchgear for power monitoring
- Energy efficiency, consumption analysis & cost allocation, switchgear monitoring
- Power quality of energy distribution systems
- Commercial and industrial buildings
- Utility low voltage distribution substations.
Besides smart grid applications, the ARH product series can also be used in other areas:
- Protection Systems: Detect fault currents and overcurrent conditions; Used in differential protection and ground fault detection.
- High Current Measurement: Ideal for measuring thousands of amps in busbars, generators, and transformers; Common in steel plants, data centers, and substations.
- Renewable Energy Systems: Monitor inverter output in solar and wind installations; Track AC current in grid-tied systems.
- Electric Vehicle (EV) Charging Stations: Measure current flow for DSO side; Support dynamic load management.
ARH Rogowski Coils – Standards Compliance
| ARH Series |
|---|
| IEC 61010-1:2010/AMD1: 2016 |
| IEC 61010-2-032: 2012 |
| IEC 61869-10: 2017 |
| UL 61010-1: 2016 |
| UL 61010-2-032: 2012 |
| UL 2808 |
LEM ARH – Download & Technical Characteristic
| Product | Nominal value | Op. Temperature | Output Voltage | Aperture | Output Cable Length |
|---|---|---|---|---|---|
| ARH-B22-D70 | 1000 A | -40 to 105 °C | 22,5 mV/kA | 70 mm | 1 m |
ARH Sensors – ASK FOR SAMPLES / QUOTATIONS
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