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BM201 Feature Image

Key Features

  • Rugged, Compact Design with multiple mounting options - Din-Rail, Direct
  • 3 and 6 Channels for monitoring 3/6 bushings
  • Monitors Leakage Current, Tan Delta (PF), Capacitance and Voltage
  • Best in class EMI, ESD Immunity
  • Modbus (Serial-RS485) integration with third party systems
  • LED indictaors for system and channel failures
  • Built-In Fail Safe Relay for System Failure

Product Description

BM201 Product


Rugged design, designed for reliability, bushing monitor for OEMs (Original Equipment Manufacturers) with advance and simple integration features to third party systems/gateways

BM201 Benefits
    • Suitable for OEM-type applications (TMS, Gateways)
    • Multiple mounting options - Din-Rail and Direct (Bare-board)
    • Cost optimized solution for bushing monitoring
    • Software designed for integration into monitoring systems / gateways
    • Robust datalogging and Analytics
    • Customizable according to customer specific applications
    • Sensors and Monitors do not require complex recalibration
    • Highly robust and safe monitoring systems
BM201 Applications
    • Online monitoring of condensing / capacitive type bushings
    • Online Monitoring of Transformer Bushings
    • Online Monitoring of Breaker Bushings

Detailed Overview

The Rugged Monitoring BM201 is a compact design, designed for reliability Bushing Monitoring Module that can operate under High voltage substation environments. The BM201 Bushing Monitor combines reliability and user-friendly configuration software. It has two variants, 03 channel and 06 channels, that can monitor 3 and 6 bushing respectively. The system is based on proven Balance Current (Sum of Current) method for measuring Tan Delta (Power Factor - PF), and Capacitance of Condensing Type Bushings.

The BM201 connects to the Bushing Adaptors installed at the Voltage / Test taps of the condensing (Capacitive) type bushing. It measures the leakage current from the three phases and calculates the changes in the TanDelta and Capacitance of the bushings. The measured and calculated values are then sent to the third-party system via Modbus (RTU) protocol using built-in serial (RS-485) port. The BM201 also captures the hourly average of the Tan Delta, Capacitance, Voltage for absolute and rate of change. It has the data integration capability of multiple monitoring platforms. There is a dedicated team of experts available for customizing bushing monitoring solutions to meet specific customer needs.

Technical Specifications

# of Relays Outputs01 x Fail Safe Relay for System Failure
Power Input12 - 24V DC ( Default)
Humidity95% Non Condensing
Dimensions4.92" x 4.92" x 1.89" (125mm x 125mm x 48mm)
Number of Channels03 and 06 channels
Storage Temperature-40 to 85 °C
Operating Temperature-25 to 75 °C
Configuration PortUSB (to use with Rugged Connect windows software)
Serial PortRS-485 with Modbus RTU
Logging1 sec interval on USB
MemoryMicroSD external memory slot (Up to 2 TB)
Scan Rate-200 ms / channel
Measurement Accuracy Voltage± 0.5%
Measurement Accuracy Capacitance± 0.1%
Measurement Accuracy Tan Delta (PF)± 0.5%
Measurement Accuracy Leakage Current± 0.5%
Measurement Range Leakage Current1mA to 200mA

Ordering Code

BM201 Product

Product Drawing

BM201 Drawing