Three-Phase Transformer Turns Ratio Tester

Three-Phase Transformer Turns Ratio Tester – Overview

The great advantage of the Three-Phase Transformer Tester PWR3A is its simple set-up. You simply type in the vector group with the keys to set up, connect the transformer to the device, and release the measurement. All three phases are measured consecutively. All connecting and short-circuited procedures at the primary and secondary voltage sides are performed automatically before each measurement. It is also possible to measure just one phase. An adjustable set value allows an error or deviation of the measured transformation ratio to be displayed. Automatic control of the tap changer is provided. All phases and taps are measured consecutively, and the results are stored inside the instrument and transferred to a PC. The transformer-specific data can be easily programmed via a connected PC but it is also possible via the internal keyboard. The PWR3A is connected to the H.V. and L.V. sides via four connections each. It also powers the test object at a selected voltage, supplied by an internal isolating transformer. An external excitation using different voltages and frequencies is also possible.

Three-Phase Transformer Turns Ratio Tester – Features

• Ratio range from 0.75 to 20,000 (higher ratios with CVT-Ext.)
• Fully automated measurement
• Features market unique Vector Group Detection
• Measuring voltage from 8 V to 230 V
• Measuring voltage up to 5 kV by CVT-Extension: PWR3A-CVT
• Using 3-phase voltage for phase angles other than 0°/180°
• Easy to handle tap changer automatic
• Internal memory stores all dates (Reading with PWR3A-XFER)
• LC display (256 x 128 pixel) with backlight
• Easy input of vector group and measuring conditions
• USB/RS232C port to get full instrument control
• Centronics printer port or built in printer (optional)
• Robust mobile case for field use
• Factory Certificate

Datasheet

Description

Three-Phase Transformer Turns Ratio Tester

Technical Specifications

Ratio measurement

Total Range :

0.75 – 20,000 : 1

Max. errors (0.75 – 2,500) :

± 0.10 % ± 1d @ 8 V – 230 V

Max. errors (2,501 – 5,000) :

± 0.10 % ± 1d @ 40 V – 230 V
± 0.15 % ± 1d @ 8 V

Max. errors (5,001 – 10,000) :

± 0.10 % ± 1d @ 80 V – 230 V
± 0.20 % ± 1d @ 8 V – 40 V

Max. errors (10,001 – 15,000) :

± 0.15 % ± 1d @ 80 V – 230 V
± 0.30 % ± 1d @ 8 V – 40 V

Max. errors (15,001 – 20,000) :

± 0.30 % ± 2d @ 160 V – 230 V
± 1.00 % ± 2d @ 40 V – 80 V

Measuring voltage :

8 V | 40 V | 80 V | 160 V | 230 V
by an external source (8V – 240 V)

Measuring frequency :

45 Hz – 65 Hz

Range selection :

Full automatic

Phase angle measurement

Range (single-phase) :

– 9.9 ° to + 9.9 °

Range (three-phase) :

– 179.9 ° to + 180 °

Max. error :

± 0.1 ° ± 2 digit

Mag.current measurement :

1 mA – 2000 mA ± 1 mA

Multiplexer

Connections HV :

1U | 1V | 1W | 1N / H0,1,2,3 Amphenol

Connections LV :

2U | 2V | 2W | 2N / X0,1,2,3 Amphenol

Connections ext. excitation :

8 V ? 240 V (1/3-phase) AC, STASEI 5

Error detection :

Contact- and stability errors displays:
HV / LV too low
Bad line stability

Setpoint input :

Using Front Panel, via RS232 or chipcard

Deviances :

Shown on display, via RS232

Start of measurement :

Using Front Panel, via RS232 or IEEE – 488

Result format :

Measuring Time :

5 – 20 s depending on line noise/distortion

Measurement Storage :

Ca. 2000 sets of data on Internal Memory

Data Transfer :

Direct or later on with PWR3A-XFER – Program

Correct Connections :

Tested before each measurement

Ports :

USB | RS232C (full device control) printer (parallel, ANSI standard, optional)

Temperature :

Operating: -10° – 50°C
Storage: -20° – 65°C

Humidity :

0 – 90% (Storage 95%) non condensing

EMC, Safety, Vibration :

CE | IEC61010-1 | ASTM D 999.75

Dimensions :

490 x 400 x 190 mm (WxDxH, mobile ABS rugged case)

Weight :

Approx. 10 kg without cables

Power Supply :

230VAC +10% -15% (196 – 250VAC) / 48 – 62Hz

Three-Phase Transformer Turns Ratio Tester PWR3A

Three-Phase Transformer Turns Ratio Tester | PWR3A

Three-Phase Transformer Turns Ratio Tester | PWR3A