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Transformer & Motor Testers

MRC7300A

Three Phase Transformer Measuring Bridge
for Resistance- and Ratio-Measurements

General Information
Technical Data
General Information

With the precision measuring bridge MRC7300A it is possible to safely determine winding resistances, transformation ratios and phase angles of distribution transformers up to 100MVA and more. Further it is possible to automatically move the tap charger of the H.V. winding to the next tap and perform cool-down measurements in temperature rise tests to calculate the resistance in the case of a load disconnection @ t0.

The MRC7300A 3-phase measuring bridge can be used by transfomer manufacturers, electricity supply companies and repair companies having to carry out on-site measurements under unfavourable conditions.

Resistance values ranging from 50 µΩ to 500 µΩ can easily be measured and logged with the internal measuring current of a maximum of 15 A up to a power of apprx. 100 MVA and more. To allow a compariosn of the measured values to previous measurements a conversion of the temperature of the test object is provided in order to compare measurements of a detached transformer carried out in the winter and measurements carried out in another season.

The provided Kelvin clips and lugs as well as all cables required allow an easy and safe connection of the measuring bridge to the test object. The tap changer can be moved and measured step by step by means of the automatic system which is connected to the tap changer’s signalling control of the transformer.

The measuring range is between 0.9:1 and 2500:1 in the case of the transformation ratio; the resolution of the angle measurment is 0.1 degrees. The logging of all measured values is performed by a seperate printer, computer or via the internal memory.

The magnetic loading of the transformer is performed quickly to a relatively high tsrating voltage (50V).

The unloading of the core is very safe, as the energy is destroyed in the MRC7300A by a ballast resistor and varistors except for a neglible rest.

Surge arresters protect the MRC7300A from peak voltages. During the moving of the tap changer to the next tap, with the measuring current still flowing, the measuring circuits are disconnected from the test object to protect the input amplifiers.

Technical Data
Resistance Measurement
Range50 µΩ - 500 Ω autoranging
Test object limitsabout 30 to 250 MVA depends on type
Max. error±0.1 % of MV ± digit
Measuring Current, max.25 A
Loading Voltage, max.50 V
Measuring Power, max.250 VA
Ratio measurement
Range0.900 - 2,500 autoranging
Max. error±01. % of actual value ± 1 digit
Measuring voltage180 V (other voltage on demand)
Measuring frequency50 Hz / 60 Hz (line dependent)
Phase angle measurement
Range (one phase)- 9.9 ° to + 9.9 °
Range (three phase)- 179.9 ° to + 180 °
Max. error± 0.1 ° ± 3 digits
Magnetising current measurement
Range1 MA - 2000 mA
Max. error± 1 %
Temperature measurement
Range- 20 °C to + 100 °C, linearized (for PT 100)
Max. error0.2 °K (without probe error)
Type of sensorPT 100 temperature probe
Application#1: Temperature for TC-Compensation
#2: Temperature other test point optional more probes with internal or external scanner (depends on number)
Start of measurementby using keypad and via USB
InterfaceUSB
Thermo Printer
Size/WeightH22 B42 T43 cm / approx. 16 kg
Download Data-Sheet
Features

Features

  • Automatic measurement without any manual interaction
  • Resistance measurment with high accuracy and up to 15 A current
  • Ratio measurement including phase angle and magnetising current
  • Dual measuring method for faster measurements
  • Automatic vector group detection
  • Tap changer control measures all transformers taps automatically
  • Heat-up measurement including algorithm for resistance at t=0
  • Temperature measurement and compensation to 20 °C for Cu or AI
  • USB port to get full external control over the instrument
  • Thermo printer

DIN EN ISO 9001:2008

Questions?
Don’t hesitate to get in touch! We’ll be glad to provide you with technical assistance as well as provide you with any needed information regarding features, prices, shipment & reselling.

phone: +49 (0)3328 / 3179 – 0
fax: +49 (0)3328 / 3179 – 10
email: sales@schuetz-messtechnik.com

PWR 1-3B




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Germany
+49 (0) 3328 3179 0
+49 (0) 3328 3179 10
sales-at-schuetz-messtechnik.com
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