The Megger MRCT relay and current transformer test set is a lightweight, robust, portable unit used to perform demagnetisation, ratio, saturation, winding resistance, polarity, phase deviation, and insulation tests on current transformers (CTs). The MRCT automatically calculates ratio errors, saturation curves, and knee points and provides a microprocessor-controlled variable voltage and current output and precision instrumentation for automatically testing single and multi-ratio CTs, reducing testing time and increasing productivity. The MRCT will directly connect to multi-ratio CT’s and perform all tests – saturation, ratio, polarity, winding resistance, and insulation – on all taps with the push of a button and without changing leads.


The MRCT can be controlled via Megger’s Smart Touch View Interface (STVI) controller, a full colour, high resolution, LCD touch screen which allows you to perform manual and automatic testing quickly and easily, and you can use the pre-constructed test routines to make testing even easier. The large display on the instrument enables you to easily read all pertinent data while the test is being performed and gives you ability to view the current transformer’s saturation curve. The unit can also be configured to come without a Megger STVI and can be controlled via a laptop with Megger’s PowerDB software.


Using the MRCT, current transformers can be tested in their equipment configuration, such as being mounted in transformers, oil circuit breakers, or switchgears. It is necessary for the equipment to be completely isolated from the electrical system prior to testing.

Output

Voltage: 

Continuously variable in three ranges:

0 to 30 V at 5.0 A max (15 minute on, 5 minute off)

0 to 300 V at 1.0 A max (15 minute on, 5 minute off)

300 to 2000 V at 1.0 A max (5 minute on, 5 minute off)


Current

Output Current: Power Max V/Duty Cycle

30 Amperes: 200 VA (282 peak) 6.67 V rms (15 minutes on, 5 minutes off)

60 Amperes: 600 VA 90 cycles


Voltmeters

Output:

Resolution: 0.0000 to 1.9999/19.999/199.99/1999.9

Ranges: 0 to 2/20/200/2000 V

Accuracy: 

±0.5% of reading typical

±1.0% of reading typical


Input:

Ranges: 0 to 0.35/2.0/20.0/200.0/600.0 V

Resolution: 0.0001 to 1.9999/19.999/199.9/600 V

Accuracy: 

±0.02% of reading and ±.02% range typical

±0.05% of reading and ±05% range maximum


Secondary Voltage Measurement:

Ranges: 0 to 2/20.0/200.0/2000.0 V

Resolution: 0.0000 to 19.999/199.9/1999.9 V

Accuracy: 

0 to 999.9 V:

±0.02% of reading and ±.02% range typical

±0.05% of reading and ±.05% range maximum

1000 to 2000 V:

±0.08% of reading and ±.08% range typical

±0.2% of reading and ±0.2% range maximum


Ammeter

Output:

Ranges: 0.0 to 1.0/10.0/60.0 A

Resolution: .001/.01


Input:

Excitation curve testing:

Range: 0.0000 to1.0 A

Accuracy: 

±0.08% of reading ±.08% range typical

±0.2% of reading ±0.2% range maximum


Phase Angle Measurement

Range: 0 to 360 degrees

Resolution: 1 minute

Accuracy: 

±3 minutes typical

±6 minutes maximum


Ratio Test

Secondary Voltage Injection Method:

Range | Accuracy

0.8 to 2000 V | ±0.02% typical , ±0.05% maximum

2000 to 5000 V | ±0.03% typical , ±0.1% maximum

5000 to 20000 V | ±0.05% typical , ±0.2% maximum


Winding Resistance Test

Measuring Range: 0 – 30 Ω

Accuracy: 

(at 20° C) 0.5% ±3 mΩ (typical) /

1% ±10 mΩ (guaranteed) (0 – 30 Ω)


Insulation Test

Test Voltage: 1000 VDC, 500 VDC

Measuring Range: 20 GΩ, 10 GΩ

Short Circuit Current: 1.5 mA nominal

Test Current on Load: 1 mA at min. pass values of insulation (as specified in BS7671, HD 384 and IEC 364)

Accuracy: 

1000 volts ±3% ±2 digits ±0.2% per GΩ

500 volts ±3% ±2 digits ±0.4% per GΩ

MRCT datasheet


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