ABB EM020-9318 Voltage Sensor 2000V Closed Loop Hall Effect Measuring Device for Railway and Industrial Power Monitoring Applications

The ABB EM020-9318 is an electronic voltage sensor designed for accurate measurement of DC, AC, and pulsating voltage signals in industrial and railway electrical systems. As part of ABB’s EM020 voltage sensor family, this device uses closed loop Hall effect technology to provide precise voltage measurement while maintaining galvanic isolation between the primary high voltage circuit and the secondary measurement circuit.

Voltage measurement plays an essential role in modern electrical systems. Power converters, railway traction systems, industrial drives, and energy management equipment require accurate monitoring of electrical parameters to ensure safe operation, efficient control, and reliable system performance. The ABB EM020-9318 provides a professional sensing solution for applications where high voltage measurement accuracy and electrical isolation are required.

According to ABB technical documentation, the EM020-9318 is a railway voltage sensor with a nominal primary voltage of 2000V RMS, a secondary output current of 50mA, and a supply voltage range of ±15V to ±24V DC. It is designed for measuring electrical voltages while providing isolation between primary and secondary circuits. :contentReference[oaicite:2]{index=2}

ABB EM020-9318 Product Overview

The ABB EM020-9318 belongs to the ABB EM020 series of electronic voltage sensors. These sensors are developed for applications requiring reliable voltage monitoring in environments where direct electrical connection between measurement circuits and high voltage systems is not suitable.

The sensor uses closed loop Hall effect measurement technology. This technology allows the device to detect voltage-related magnetic effects generated by the primary circuit and convert them into a proportional secondary output signal. The output signal can then be processed by control systems, monitoring equipment, or protection devices.

The main advantage of this measurement method is electrical isolation. The primary high voltage side and secondary control side remain separated, improving system safety and protecting sensitive electronic equipment from high voltage exposure.

The ABB EM020-9318 is identified by the commercial reference EM020-9318 and order code 1SBT182020R9318. It is designed as a voltage sensor for industrial and railway applications requiring accurate and stable voltage measurement. :contentReference[oaicite:3]{index=3}

Technical Characteristics of ABB EM020-9318

The ABB EM020-9318 includes technical features designed for professional voltage measurement applications. Main product information includes:

• Manufacturer: ABB
• Model: EM020-9318
• Order code: 1SBT182020R9318
• Product type: Electronic voltage sensor
• Technology: Closed loop Hall effect measurement
• Nominal primary voltage: 2000V RMS
• Secondary output current: 50mA
• Supply voltage: ±15V to ±24V DC
• Accuracy at nominal voltage: ≤ ±1%
• Linearity error: ≤ ±0.1%
• Operating temperature range: -40°C to +75°C
• Primary connection: M5 terminals
• Secondary connection: 5 × M5 terminals

The EM020-9318 provides high measurement accuracy and stable signal conversion. ABB specifies an accuracy of ≤±1% at nominal voltage conditions and linearity performance of ≤±0.1%, making it suitable for systems requiring reliable electrical measurement. :contentReference[oaicite:4]{index=4}

Working Principle of ABB EM020-9318 Voltage Sensor

The ABB EM020-9318 operates using closed loop Hall effect technology. When voltage is applied to the primary circuit, the sensor detects the resulting electrical characteristics and generates a proportional magnetic field response.

The internal measurement electronics process this signal and produce a secondary output current proportional to the measured voltage. The output signal can then be used by control systems, monitoring devices, and protection equipment.

Because the primary and secondary circuits are electrically isolated, the sensor provides safe measurement of high voltage systems without directly exposing control electronics to dangerous voltage levels.

This operating principle allows the ABB EM020-9318 to provide accurate measurement performance while maintaining excellent electrical isolation characteristics.

Electrical Measurement Functions

The ABB EM020-9318 is designed to measure different types of voltage signals, including DC voltage, AC voltage, and pulsating voltage. This flexibility allows it to be applied in various power conversion and industrial control environments.

Important measurement functions include:

• High voltage measurement
• DC voltage monitoring
• AC voltage monitoring
• Pulsating voltage measurement
• Galvanic isolation between circuits
• Signal conversion for control systems

Accurate voltage measurement allows automation systems to monitor electrical conditions, optimize operation, and detect abnormal situations before they affect equipment performance.

Industrial Applications

The ABB EM020-9318 is widely used in applications where reliable voltage measurement and isolation are required.

Typical application areas include:

• Railway traction power systems
• Power converters
• Industrial drive systems
• Energy monitoring equipment
• Electrical testing systems
• Power electronic equipment
• Industrial automation systems

Railway systems require accurate monitoring of traction voltages to ensure safe and efficient operation. Voltage sensors such as the ABB EM020-9318 provide essential feedback information for control and protection systems.

In industrial power conversion applications, voltage measurement enables controllers to regulate power flow, monitor system conditions, and improve equipment reliability.

Advantages of ABB EM020-9318

One major advantage of the ABB EM020-9318 is its high voltage isolation capability. The device separates the measurement circuit from the high voltage system, improving safety and protecting electronic control components.

Another advantage is measurement accuracy. With low linearity error and stable output characteristics, the sensor provides reliable signals for industrial control systems. :contentReference[oaicite:5]{index=5}

The compact electronic design allows integration into complex electrical systems where space and reliability are important factors.

ABB’s experience in industrial electrical measurement technology ensures that the EM020-9318 is suitable for demanding applications requiring long-term operational stability.

Integration with Industrial Control Systems

The ABB EM020-9318 is commonly integrated into systems containing power converters, controllers, monitoring equipment, and protection devices.

In a typical application, the sensor measures the voltage of a high voltage circuit and provides a proportional output signal to the control system. The controller uses this information to regulate operation, monitor performance, or activate protection functions.

Engineers selecting and installing voltage sensors must consider voltage range, measurement accuracy, supply requirements, environmental conditions, and connection methods.

Proper integration ensures that electrical systems operate efficiently while maintaining accurate monitoring capability.

Maintenance and Reliability Considerations

Voltage sensors are critical measurement components in electrical systems, and proper maintenance helps ensure reliable performance. Regular inspections should include checking terminal connections, installation conditions, and environmental influences.

Factors such as vibration, temperature variation, humidity, and contamination may influence electronic components over extended operation periods. Maintaining suitable installation conditions helps improve equipment reliability.

The ABB EM020-9318 uses a robust industrial design intended for demanding applications, providing stable measurement performance throughout its operating life.

Role in Modern Industrial Automation

Modern industrial automation systems rely heavily on accurate electrical measurement data. Voltage sensors provide essential feedback information that allows controllers to make precise decisions and maintain efficient operation.

The ABB EM020-9318 contributes to advanced electrical monitoring systems by providing accurate voltage measurement combined with galvanic isolation. Its application in railway and industrial power systems demonstrates the importance of reliable sensing technology in modern infrastructure.

As industries continue increasing automation levels and improving energy efficiency, high-performance measurement components remain essential for safe and optimized system operation.

Conclusion

The ABB EM020-9318 is a professional electronic voltage sensor designed for accurate measurement of DC, AC, and pulsating voltages. With closed loop Hall effect technology, 2000V nominal primary voltage capability, 50mA secondary output, and galvanic isolation design, it provides a reliable measurement solution for industrial and railway applications. :contentReference[oaicite:6]{index=6}

Through ABB’s advanced sensing technology and industrial engineering expertise, the EM020-9318 supports safe electrical monitoring, accurate control feedback, and reliable operation in modern power conversion and automation systems.