EMT-100

Multi-range Reference Electronic Current Transformer

Accuracy class 0.001

Purpose

The EMT-100 is a reference transformer designed to convert input AC current into an output AC voltage

Application

Intended for use in calibration systems for testing and verification of electrical measuring instruments in national metrology institutes, industrial facilities, and the power industry.

EMT-100 can be integrated into the following systems:

1.	Power Calibration System PCS-ME 1.0
2.	DCS-ME 61850 — system for calibration of digital current transformers
3.	MarsTest-ECT - system for calibration of low-power electronic current transformers with analogue outputs in compliance with IEC 60044-8:2010

Basic accuracy specifications

Nominal transformation ratio (KTR): 0.1; 1.0; 10; 100 A/V
For testing of energy meters, power transducers, and current transformers

Current measurement range	Measurement error within 40 … 70 Hz		Measurement error within 25 … 1000 Hz
Current measurement range	ratio	angle	ratio	angle
0,01 ... 10 А	0,001 %	0,05 min	0,005 %	0,05·(f/50) min
10 ... 120 А	0,002 %	0,1 min	0,01 %	0,1·(f/50) min

For testing of low-power electronic current transformers

Rated input current, A

Rated output voltage

of the programmable gain amplifier, mV*

Measurement error

Ratio

Angle

1; 5

333, 255, 150

0,01 %

0,5 min

* Rated output voltages can be selected by the customer within the range from 22.5 mV to 10 V (in accordance with IEC 60044-8:2010 standard values: 22.5 mV – 150 mV – 200 mV – 225 mV – 4 V).

Benefits

	Replaces a complete set of reference shunts (0.1; 0.5; 1; 5; 10; 20; 50; 100 A) for AC current measurements
	Input current range switching via Ethernet interface or manual operation
	Built-in overcurrent protection
	Galvanic isolation
	Minimum load resistance: 500 kΩ
	Output resistance: 2 Ω