Current Measurement Device (CMD®II)

Non-Contact Current Transformer

Enhance Your Smart Grid

A non-contact current transformer measures three-phase current at line voltages to protect power systems and to provide critical real-time information to protection relays and power system operators via SCADA. Its design utilizes line mounted sensors to measure line currents and deliver real-time point on wave current measurements. With no solid insulation to ground, the CMD® II  current measuring device is more reliable than freestanding current transformers, and is less costly and less space consuming.

Smart Transmission Line Tap

Additionally the CMD® II can be applied on switches outside the substation environment to revolutionized the speed transmission line customers are restored to service. The Smart Grid initiative has over looked this need but a solution is now available.

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CMD® II - CSV & transformer

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  • Easy retrofit of current measurement (initial or additional) to existing equipment
  • No foundations or structures required
  • Compact, space saving CT solution
  • Eliminates the need for freestanding current transformers
  • Enhances reliability through technologically differentiated current sensing
  • Reduces installation costs substantially The Next Level Of Innovation
  • Measures phase currents in real time
  • Outputs compatible with digital, microprocessor-based relays
  • Calibration by customer using standard CT tools & procedures
  • Electrical cabinet mounted, wired, and shipped on CapSwitcher®, RLSwitcher®; Disconnect Switch, CSV, CSV-DB, CSV-CB, or CSV-CB-SE
  • Self powered (no batteries at line potential)
  • Interfaces with digital protection relays or RTUs
  • EM real-time data transmission
  • Mounts on new or existing equipment
Voltage (kV)*** 15.5 27 38 48.3 72.5 123 145 170 245
VIL (kV) 110 150 200 250 350 550 650 750 900
Range of Continuous Currents 35 A to 8000 A****
Range of Fault Currents .050 kA (50 Amps) to 80 kA****
Ambient Temperatur Range -40 ° C to +50 ° C standard (-50 ° C to +50 ° C optional)

 

Input Voltage 12/24/48/125/250 VDC or 120/240 VAC
Input Power 125 W continuous 480 W maximum*
Output (relay input) 1 A continuous 20 A maximum*
Output (RTU input) 10 V continuous 120 V maximum*
Measurement Error 2-45 continous** 10% maximum**
Relay Burden 0.15 ohms maximum

* Maximum values during fault measuring events

** Signal latency of 2.5 ms and 4 ms.

For other ratings (including, but not limited to, EHV applications) contact SSIPower.

*** The 15.5 kV entry in the above chart indicates that the CMD II can be applied at any distribution system voltage (e.g. 2.4 kV, 4.16 kV, and the like).

**** Signal startup delay of 3 ms to 8 ms on energizing a circuit depending on load or fault current.

Reactor Switching

Circuit Switchers

Power Transformer Switching and Protection

Disconnect Switches

Distribution Poles

Subtransmission Poles/Towers

Transmission Poles/Towers

EHV Transmission Poles/Towers

Substation Structures

Live Tank Circuit Breakers

Dead Tank Circuit Breakers

Transformer Protection and Switching

Transmission Reliability Improvement

High Voltage Current Measurement

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