LV100-4000/SP9,LV100-4000/SP9

‌LV100-4000/SP9 Closed-Loop Voltage Sensor — The Precision Sensing Core for High-Voltage Industrial Systems

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LV100-4000/SP9 ‌Key Features‌
Leveraging ‌closed-loop magnetic compensation Hall technology‌, it achieves zero-flux dynamic balance between primary and secondary sides, eliminating drift and nonlinearity to deliver ‌high stability, low noise, and zero-delay‌ voltage signals even under extreme conditions.
‌Ultra-High Voltage Measurement‌: Rated for ‌4000 V RMS‌, with a measurement range extending to ‌±6000 V‌, engineered specifically for medium- and high-voltage DC systems in traction, energy storage, and renewable inverter applications.
‌Industrial-Grade Electrical Isolation‌: Primary-to-secondary insulation withstands ‌12 kV RMS‌, compliant with ‌EN50155‌ railway standards, ensuring system safety and signal integrity in high-voltage environments.
‌Wide Temperature Operation‌: Functional across ‌-25°C to +70°C‌, with design variants supporting harsher conditions, ideal for outdoor converter stations and locomotive traction enclosures.
‌Optimized Transient Response‌: Response time under ‌200 μs‌ enables precise capture of high-voltage bus transients, critical for energy recovery, short-circuit protection, and fast closed-loop control.
‌Zero Insertion Loss Architecture‌: Integrated primary resistor eliminates external sampling components, reducing system complexity and eliminating parasitic heat and EMI sources.

LV100-4000/SP9 ‌Technical Specifications‌

‌Sensor Type‌: Closed-loop Hall effect voltage sensor

‌Rated Voltage‌: 4000 V RMS

‌Measurement Range‌: ±6000 V

‌Secondary Output Signal‌: Linear proportional current output (typical 50 mA)

‌Supply Voltage‌: ±15 V to ±24 V DC bipolar (external)

‌Response Time‌: ≤ 200 μs

‌Bandwidth‌: DC ~ 100 kHz

‌Accuracy Class‌: ±0.9% F.S. (over full temperature range)

‌Temperature Drift‌: ≤ 0.6 mA (-25°C to +70°C)

‌Insulation Withstand‌: 12 kV RMS / 50 Hz / 1 min (primary-secondary isolation)

‌Operating Temperature‌: -25°C to +70°C

‌Mounting‌: Panel mount, M5 threaded terminals for primary/secondary connections

‌Protection Rating‌: UL94-V0 flame-retardant housing, suitable for high-EMI and high-humidity industrial environments

LV100-4000/SP9 ‌Typical Applications‌

‌Railway Traction Inverters‌: Closed-loop feedback on DC bus voltage for precise control of traction and regenerative braking

‌High-Voltage Energy Storage Systems‌: Real-time DC-side voltage monitoring for battery charge/discharge safety and efficiency

‌Solar and Wind Inverters‌: DC bus voltage acquisition to support MPPT algorithms and islanding protection logic

‌Large-Scale UPS and SVG Units‌: High-accuracy feedback for DC bus regulation and reactive power compensation

‌Industrial Welding Power Supplies‌: Monitoring arc voltage fluctuations to enhance welding stability and process consistency

‌Why Choose LV100-4000/SP9?‌
As the flagship closed-loop voltage sensor in LEM’s LV series designed for ‌high-voltage industrial systems‌, the LV100-4000/SP9 redefines industry standards in ‌accuracy, isolation, and reliability‌.
Its unique combination of ‌12 kV insulation‌ and ‌±0.9% accuracy‌ far exceeds open-loop alternatives, significantly reducing false trip risks—especially critical in rail and renewable energy applications.
The “SP9” suffix denotes the ‌railway-optimized variant‌, certified to ‌EN50155‌, with enhanced resistance to vibration and electromagnetic interference, ensuring continuous operation under harsh locomotive conditions including frequent starts, stops, and grid fluctuations.