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Precision Electronically Compensated Current
Transformer with Remote Load Management

The CMR-I 2x30 is a small-sized electronically compensated current transformer unit for isolated precision current transmission. The through-hole concept and single wire capability enable any user defined current ratio. The unit is dedicated for testing of electricity meters with closed current-potential circuits and for universal step-up/down current transformation applications with excellent accuracy and dynamics.

The CMR-I 2x30 is equipped with Load Monitoring, Protection Circuits and Load Bypass with serial remote control.

The CMR-I 2x30 can be implemented into any existing test system with negligible additional power losses. Current ratio can be set by number of primary and secondary wires passing the hole. The internal electronics of the device assures the specified accuracy for any up/down ratio.

Highlights

• 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

• Programmable load by-pass

• Automatic unused position by-pass

• Easy implementation to existing systems

• Simple user test of functionality and accuracy

• Accuracy maintained for any up or down current transformation

Patent Protection !

Specifications

	CMR-I 2130	CMR-I 2230	CMR-I 2330
Output / Input Ratio	Defined by input and output turns (1:1 for single wire circuit)
Dynamics	> 200 000 (240 A : 1 mA for single wire)
Max. Ampere-turns	240 A*turn	2 x 240 A*turn	3 x 240 A*turn
Max. Output Power	72 VA @ 240A	2 x 72 VA @ 240A	3 x 72 VA @ 240A
Max. Output Voltage	0.3 V * N_s
Operating Frequency	45 .. 65 Hz
Max. Load Resistance	0.05 W * N_s²
Primary Current Range	1 mA / N_P .. 240 A / N_P
Max. Amplitude/Phase Error	0.05 % / 0.03° (CMR-I 2x30A) 0.02 % / 0.01° (CMR-I 2x30E) 0.01 % / 0.005° (CMR-I 2x30S)
Comunication	RS-422
Protection	Overload, Open Circuit
Hole Diameter	26 mm
Size (L x H x D)	160 x 90 x 120 mm	160 x 170 x 120 mm	160 x 250 x 120 mm
Weight	approx. 5 kg	approx. 7 kg	approx. 9 kg
N_s … number of secondary turns, N_p … number of primary turns

	PSCI 1220A
	Power Supply for up to 60 single phase, up to 30 two phase or up to 20 three phase CMR-I units
Input Voltage Range	85 .. 264 VAC / 50 .. 60 Hz
Size (L x H x D)	100 x 118 x 220 mm
Weight	approx. 2 kg