ABB CMA198
ABB CMA198 - Image 2

ABB CMA198

Product Brief Introduction

CMA198 is a high-precision electrical parameter measurement module developed for power plant DCS system, used for real-time collection of three-phase AC voltage, current, power factor, power and other electrical parameters of generator auxiliary power distribution cabinet, with ±0.5% high measurement accuracy, adapt to strong electromagnetic interference environment of power station power distribution room.

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Category: SKU: ABB CMA198

Description

ABB CMA198

 

Technical Specifications & Performance Parameters

  1. Physical Size: 100mm (W) × 60mm (H) × 30mm (D); net weight 0.3kg
  2. Installation Mode: Standard 35mm DIN rail rail mounting inside electrical cabinet
  3. Measurement Range:
    • AC voltage measurement: 0–600VAC three-phase line voltage
    • AC current measurement: 0–2000A (matched with external current transformer)
  4. Measurement Precision Index: Voltage/current measurement accuracy ±0.5% full scale; power factor precision ±0.01
  5. Working Power Supply: 24VDC auxiliary power supply, power consumption maximum 8VA
  6. Environmental Adaptability: Operating temperature -20°C ~ +60°C; storage temperature -40°C ~ +85°C
  7. Protection Grade: IP20, cabinet internal installation only
  8. Signal Output Interface: Multi-channel analog 4–20mA output, DCS backplane bus digital signal transmission
  9. Anti-interference Standard: IEC 61000-6-2 industrial heavy electromagnetic interference standard compliance

 

Function Characteristics

  1. Full three-phase electrical parameter synchronous measurement: three-phase voltage, three-phase current, active/reactive/apparent power, power factor, frequency, electric energy cumulative calculation
  2. High-precision sampling chip, support long-term stable measurement under power station harmonic interference environment
  3. Multi-channel 4–20mA analog output, each electrical parameter can be independently configured as analog signal transmitted to DCS terminal board
  4. Built-in overvoltage, overcurrent threshold alarm function, when electrical parameters exceed the set range, output switching alarm signal
  5. DCS backplane digital communication function, upload all measured electrical data to CMA126 main control module in real time
  6. Compact DIN rail mounting structure, can be installed directly in power distribution cabinet without additional panel space
  7. Real-time self-diagnosis of current transformer open circuit, voltage loss fault, upload fault alarm signal to DCS monitoring system

 

Material Composition

  1. Outer shell: Black flame-retardant PA66 plastic DIN rail shell, integrated rail buckle structure
  2. Internal circuit board: Multi-layer anti-harmonic FR4 PCB, dedicated electrical measurement metering chip
  3. Wiring terminals: Screw-type nickel-plated copper terminals, three-phase voltage/current wiring partition layout
  4. Isolation components: High withstand voltage isolation transformer for voltage and current sampling channels

 

Structural Features

  1. Ultra-compact small volume design, single standard DIN rail width, occupy minimal cabinet space
  2. Integrated elastic DIN rail buckle on the back of the shell, one-hand quick disassembly without tools
  3. Front panel multi-group LED indicators: power, running, fault, threshold alarm four status lights
  4. Internal partition layout of sampling circuit and output drive circuit to reduce electromagnetic crosstalk
  5. Closed shell structure, prevent dust and metal debris from entering internal circuit in power distribution cabinet

 

Working Principle

  1. Three-phase voltage and current signals from power distribution cabinet access the internal isolation sampling circuit through wiring terminals
  2. Dedicated metering chip synchronously samples voltage and current waveforms, calculate power, power factor, frequency and other electrical parameters
  3. Convert measurement data into standard 4–20mA analog signals or digital bus signals to transmit to DCS system
  4. Compare real-time electrical parameters with user-set upper/lower limit thresholds, trigger alarm output once exceeding the limit
  5. Real-time detect abnormal sampling signals such as CT open circuit, PT voltage loss, light fault LED and upload fault information

 

Installation Requirements

  1. Install on standard 35mm DIN rail inside closed power distribution cabinet, protection grade ≥IP30
  2. Current transformer secondary wiring strictly prohibit open circuit during operation, wiring completed before power-on
  3. Three-phase voltage and current signal wiring use shielded wire, single-point shielding grounding
  4. Installed position away from high-current contactors and frequency converters, maintain more than 0.8m distance
  5. 24VDC auxiliary power supply independent fuse protection, rated fuse current 0.3A

 

Application Scenarios

  • Thermal power plant auxiliary power distribution cabinet electrical parameter monitoring
  • Hydropower station generator outlet cabinet three-phase power measurement
  • Cogeneration plant boiler fan, water pump motor power monitoring
  • Substation low-voltage power distribution cabinet multi-loop electrical monitoring
  • Energy storage power station AC side power parameter real-time collection

 

Usage Precautions

  1. CT secondary wiring must connect short-circuit grounding terminal before disassembly to prevent high-voltage open circuit danger
  2. Do not connect AC high voltage exceeding 600VAC to voltage sampling terminals to avoid internal chip breakdown
  3. Regularly check wiring terminal screw tightness to prevent heating caused by loose contact
  4. When harmonic distortion rate of power grid exceeds 30%, increase signal filtering parameters through DCS configuration software
  5. Do not install in environment with conductive dust such as metal powder to avoid internal circuit short circuit

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