Common mode rejecters CMR-I

The Precision Electronically Compensated Current Transformers CMR-I are a small-sized electronically compensated current transformers unit for isolated precision current transmission.

Properties

  • Standalone through-hole precision electronically compensated transformer with single wire capability.
  • Excellent accuracy and dynamics.
  • Remote control via serial communication.
  • Monitoring of individual contact resistance and power loss.
  • Protection against open circuit and overload.
  • Disconnecting the unit (by-pass) using the program.
  • Automatic unloading of the unit (by-pass).
  • Easy prepaid and smart meters testing.
  • Easy implementation to existing systems.
  • Simple user test of functionality and accuracy.
  • Accuracy maintained for any up or down current transformation. 

Technical data

CMR-I 2130
Max. ampere-turns
240 A
Max. output power 120 VA @ 240 A
Size 160 x 125 x 90 mm
Weight approx. 5 kg
CMR-I 2230
Max. ampere-turns 2 x 240 A
Max. output power 2 x 120 VA @ 240 A
Size 160 x 125 x 170 mm
Weight approx. 7 kg
CMR-I 2330
Max. ampere-turns 3 x 240 A
Max. output power 3 x 120 VA @ 240 A
Size 160 x 125 x 250 mm
Weight approx. 9 kg

Ns – number of secondary turns;  Np – number of primary turns

Output / Input ratio Defined by input and output turns (1:1 for single wire circuit)
Dynamics > 200 000 (240 A : 1 mA pre jeden vodič)
Max. output voltage 0,3 V . Ns
Operating frequency 45 ... 65 Hz
Max. load resistance 0,05 ohm . Ns2
Primary current range 1 mA / Np ... 240 A / Np
Max. Amplitude/Phase Error (1 mA ... 240 A)  0,05 %/0,03° (CMR-I 2x30A); 0,02 %/0,01° (CMR-I 2x30E); 0,01 % /0,005° (CMR-I 2x30S)
Communication interface 
RS-422
Protection Overload, open circuit
Hole Diameter ø 26 mm
Power Supply PSCI 1220A for max. 20 ks
Input Voltage Range 85 ... 264 VAC / 50 ... 60 Hz
Dimensions (D x V x Š) 100 x 118 x 220 mm
Weight approx. 2 kg