Applied Precision Ltd. | Precision Electronically Compensated Voltage Transformer

Precision Electronically Compensated Voltage Transformer

Common Mode Rejecter for testing meters with interconnected current and voltage circuits

The Common Mode Rejecter (CMR) is an electronically compensated uncoupling unit for elimination of interaction of simultaneously tested electricity meters having interconnected current and voltage circuits (closed I-P links).

The CMR-U 1110 is universal small-sized electronically controlled precision voltage transformer for galvanically isolated voltage transmission. The unity voltage ratio is dedicated for testing single-phase electricity meters with closed current and potential circuits but its versatility enables utilization in extensive applications. The built-in active shielding between input and output eliminates capacitive current from input side to the isolated output device.

The CMR-U 1110 is constructed as universally applicable standalone unit with easy implementation to any existing test bench system. The unit has negligible additional power loss therefore no power increase is needed for closed link capability.

Highlights

• DIN rail mounting possibility

• Excellent accuracy

• Elimination of residual capacitive current from the input to output

• Operation without external power supply

• Unity transfer ratio of the CMR unit enables simple user test of functionality and
accuracy

• Built-in short circuit, overload and misconnection protection

• Easy user-friendly mounting, negligible power consumption and built-in protection
permit simple extension of any existing meter test equipment to closed I-P link testing
capability

Patent Protection !

Specifications

	CMR-U 1110
Working Voltage	230 V ± 20% (110 V ± 20% option)
Frequency Range	45 .. 65 Hz
Output / Input Voltage Ratio	1 : 1
Max. Output Current	50 mA (100 mA for 110 V option)
Max. Amplitude Error	0.05 % (CMR-U 1110A) , 0.02 % (CMR-U 1110E)
Max. Phase Error	0.03 ° (CMR-U 1110A) , 0.01 ° (CMR-U 1110E)
Power Supply	From input signal (no extra supply needed)
Internal Power Consumption	< 2 VA
Protection	Overload, Short Circuit, Misconnection
Size	155 x 140 x 90 mm
Weight	approx. 2 kg

Download

Product Leaflet (screen optimized)

cmru_ll200412b [80 kB]

Product Leaflet (print optimized)

cmru_ll200412b [2507 kB]

Article : Testing of electricity meters with interconnected current and voltage circuits

a_clink.pdf [23 kB]

Precision Electronically Compensated Voltage Transformer
CMR-U 1110

Precision Electronically Compensated Voltage Transformer
CMR-U 1110