LV100-2000/SP19 High-Precision Closed-Loop Hall-Effect Voltage Transducer

LV100-2000/SP19 Brand: LEM – Global Leader in Electrical Measurement

In power electronics, renewable energy and railway traction systems, the accuracy and reliability of voltage measurement directly determine the safe operation, energy efficiency and fault response speed of your entire system. When the measured voltage reaches the 2000V level, the demands on transducer precision increase exponentially. The LV100-2000/SP19 voltage transducer, built by Switzerland’s LEM (pioneer of closed-loop Hall-effect technology), is a high-performance measuring component specifically engineered for 2000V-class industrial equipment. It is widely used in high-voltage variable frequency drives, DC-bus monitoring, servo drives, UPS systems and renewable energy applications – trusted by premium equipment manufacturers worldwide.

LV100-2000/SP19 Product Overview

The LV100-2000/SP19 is a high-accuracy closed-loop Hall-effect voltage transducer from LEM’s LV100 series, designed for electronic measurement of DC, AC, and pulsed voltages. With a primary nominal voltage of 2000 V r.m.s. and a maximum measuring range extending to ±3000 V, it perfectly meets the voltage monitoring requirements of common industrial high-voltage power systems – whether monitoring the DC bus of a 2000V-class VFD or providing voltage feedback for a renewable energy converter.

The transducer provides complete electrical isolation between the primary and secondary circuits, with a tested isolation voltage of 6 kV @ 50 Hz for 1 minute. This ensures the safety of downstream measurement circuits and eliminates ground-potential interference and electric shock risks.

This model features an extremely fast response time of 40 µs, reaching 90% of the nominal voltage in just 40 microseconds. When the system suffers a voltage surge, spike, or sudden load change, it feeds the abnormal signal back to the control unit with near-zero delay, seizing the critical “golden response window” for overvoltage protection and dynamic control loops. That precious difference in response time could mean the difference between your equipment anticipating and safely riding through a fault versus suffering serious damage.

The transducer achieves an overall accuracy of ±0.7% and linearity better than 0.1%, providing consistent, distortion-free signals across the entire rated measuring range, ensuring accurate and reliable results under both wide input voltage swings and complex load variations.

LV100-2000/SP19 Key Advantages & Technical Features

✅ 1. Industry-Leading Measurement Accuracy

Using closed-loop Hall-effect compensation technology, the transducer achieves an overall accuracy of ±0.7% and linearity better than 0.1%. It provides consistent, distortionfree signals across the entire rated measuring range, ensuring accurate and reliable results under both wide input voltage swings and complex load variations.

✅ 2. Microsecond-Class Fast Response

With a response time of only 40 µs, this model ranks among the fastest in its class. When the system suffers voltage surges, spikes, or sudden load changes, it feeds the signal back to the control unit with exceptional speed, seizing the critical “golden response window” for your control loop. This valuable margin can mean the difference between precise, graceful protection and catastrophic equipment failure.

✅ 3. Very Low Temperature Drift & Wide Operating Range

This model offers excellent long-term stability, with zero drift of only ±0.2 ~ ±0.3 mA/°C. Combined with a wide operating temperature range of 0°C to +70°C and a storage temperature range of -40°C to +85°C (for pre-“Not for New Designs” versions), the long-term stability is outstanding. Whether in hot workshops, sealed cabinets, or outdoor environments, measurement accuracy remains consistently high without frequent recalibration.

✅ 4. High Noise Immunity & Strong Insulation

The insulating plastic case meets UL 94-V0 (highest flame retardancy rating). The closed-loop compensation architecture provides superior common-mode and electromagnetic interference rejection, ensuring stable and error-free operation even in “electromagnetic heavy environments” filled with inverters and high-power switching devices – no additional shielding required. With an isolation withstand voltage of 6 kV @ 50 Hz for 1 minute, you donʼt have to worry about safety in high-voltage applications.

✅ 5. Integrated Primary Resistor – Simplifies Engineering Integration

The primary resistor (R1) is intelligently integrated inside the housing, simplifying external circuitry and significantly reducing your BOM cost and engineering complexity. It also makes PCB layout more compact and speeds up assembly. The total weight is only 850 grams, enabling high-density system designs without sacrificing performance.

LV100-2000/SP19 Technical Specifications

LV100-2000/SP19 Wide Range of Applications

With its ±3000 V measuring range, ±0.7% accuracy and 6 kV isolation rating, the LV100-2000/SP19 is ideal for many high-voltage industrial applications:

✔ High-voltage VFDs & AC variable speed drives – Core protection for high-power motor control
Precision monitoring of inverter DC-bus voltage for efficient, smooth operation of high-power motors and extended equipment life, effectively preventing irreversible damage to power devices caused by bus overvoltage.

✔ Photovoltaic inverters & wind power converters – Protecting every kilowatt-hour of green energy
Real-time monitoring of solar panel output voltage and each inverter stage, optimising energy conversion efficiency and accurately tracking the maximum power point – safeguarding grid-connected power generation efficiency with high precision.

✔ Static converters & DC motor drives – Key to a stable DC link
Reliable voltage feedback in rectification and inversion stages, keeping the DC link stable and controllable, ensuring voltage regulation accuracy under heavy load starts and operation.

✔ Uninterruptible power supplies (UPS) – Sustained power for critical infrastructure
Real-time monitoring of input/output voltage in 380V/400V systems, ensuring critical loads receive stable power even during grid disturbances – providing a solid backup for the continuous operation of data centres, hospitals and communication base stations.

✔ Welding equipment & switch-mode power supplies – Satisfying demanding high-transient conditions
Accurate voltage detection under high-voltage, high-transient conditions. Even in harsh environments with high frequency, high inrush current and high surges, it delivers unerringly accurate signal output for consistent weld quality.

✔ Railway traction & energy storage systems – Serving the most demanding industrial applications
Measuring inverter and battery pack voltages to ensure operational safety and extend battery life, providing precise bus voltage readings in highly dynamic scenarios such as train acceleration, deceleration and energy feedback.