Atec T-R-50A-3PH User Manual

50A-3PH Current Injection System

Features

• Clear and simple user interface

• 3 phase current output

• 0-50A per phase output current

• True RMS digital metering

• Memory ammeter

• Multi-function timing system

• Auxiliary metering input

• Large back-lit liquid crystal display

• Thermal and over-current protection

• Compact and portable

• 220V 3φ or 400V 3φ supply options*

• 115V-440V 3 wire supply with

optional supply transformer

*See supply requirements overleaf

T&R Test Equipment is a market leader in the field of current
injection equipment. The range includes secondary injection
units with 50A output capability up to 6000A primary injection
systems. All have true RMS metering, a flexible timing
system, and an easy to understand user interface.

The 50A-3PH is a three phase injection system providing
commissioning and maintenance engineers with a flexible
system for testing protective systems. It has an easy to
understand panel layout and a simple user interface. The
status of every function can be seen at a glance, and there
are no complex menus to navigate.

The back-lit display on the 50A-3PH is bright and

clear with a wide viewing angle. The results of a test

can be seen here as they appear on the display

An auxiliary metering input is provided and can measure
voltage, current, frequency, and the phase between any of
the current outputs and an external voltage or current.

The unit has a range of outputs allowing injection of currents
as low as a few mA and as high as 50A. Voltages up to 18V
are available on the main outputs. Three true RMS metering
ranges are provided, allowing the full scale of the meter and
trip level to be set independently of the selected output.
Industry standard safety connectors are used on all inputs
and outputs for convenience, reliability and safety.

The 50A-3PH is comprehensively protected by overcurrent,
duty cycle and thermal trips, and keeps the user fully
informed of any trip condition. Auxiliary outputs and inputs
are fuse protected.

The 50A-3ph can be used to test many types of single and
three phase secondary protection including:

The timing system is very flexible without compromising ease
of use, allowing trip times, reset times and reclose times to be
quickly measured to a high degree of accuracy. Two
independently isolated contact inputs are provided, and the
timing system may also be used as a stand-alone timer.

• Over and under current

relays

• IDMT relays

• Auto-reclosers

• Time delay relays

• Earth fault relays

• Miniature circuit breakers

• Power relays

• Tripping relays

• Thermal relays

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50A-3PH Specification

Main Output

The main output on the unit has two taps, allowing the selection
of output voltages up to 18V and output currents up to 50A.

Range Continuous 5 minutes 1 minute

3.5V 16A 32A 50A
18V 4A 8A 12A
The above intermittent on times must be followed by an off time
of 15 minutes, and are based on an ambient temperature of 25°C.

Metering

The output is metered by a digital true RMS system with a
memory ammeter - whenever the timer stops and the output is
switched off, the current reading is held on the display. The
currents for each phase are displayed simultaneously.

Range Resolution Trip current Accuracy

5.000A 0.001A 5.25A ±0.6%rdg+5d

20.00A 0.01A 21A ±0.6%rdg+5d

50.00A 0.01A 52.5A ±0.6%rdg+5d
A current trip is automatically set to 105% of full scale of the
current metering range to protect the device under test.

Auxiliary Metering Inputs

An auxiliary metering input is provided which is able to measure
RMS voltage or current. In addition the frequency of the external
input may be measured, and the phase measured between any
of the phase outputs and the auxiliary metering input.

Setting Range Resolution Accuracy

Volts ac 270.0V 0.1V ±0.7%rdg+5d
Amps ac 5.000A 1mA ±0.7%rdg+5d
Phase ±180° 0.1° ±3°
Frequency 20-1000Hz 0.1Hz ±0.2%rdg+1d
The current input is protected by a F6.3A fuse.

Auxiliary Output

A single phase isolated 110Vac 300mA/220Vac 150mA auxiliary
output is provided on the 50A-3PH.

Lead Set Specifications

The 50A-3PH is supplied with a lead set in a plastic case including:
6 x 3m 4mm
2x3m, 2x0.5m 2.5mm2 auxiliary leads terminated in 4mm plugs

Supply Requirements

The supply voltage requirements for the unit must be specified at
the time of ordering. The unit is available for operation from
either a 400V 4 wire 3p supply or 220V 3 wire 3p supply. The
optional delta-star supply transformer allows the 400V unit to
operate from other supply voltages.
Supply option 1: 400V-10%+14% 50/60Hz 3ph 1000VA
Supply option 2: 220V-6%+14% 50/60Hz 3ph 1000VA

RS232 and T&R Link

An RS232 port is provided to allow connection of a printer or PC
and the T&R link output provides a phase lock reference for a
DVS3 phase-shifting voltage source.

2

output leads terminated in 4mm plugs.

Timing System

Range 0-999.999s Resolution 1ms

Accuracy 0.01%rdg+2d (+4d current operated mode)
The contact circuit has an open circuit voltage of 24Vdc and a

short circuit current of 20mA. Each contact circuit will auto­select for normally open or normally closed contacts. A DC
voltage of 24-240Vdc may also be used to trigger either timer
channel. The output is automatically switched off at the end of
the test to safeguard the relay under test.

The following functions are provided:

Mode Timer Start Timer Stop

Internal start Press ‘ON’ Contact 1
Single contact Contact 1 Contact 1
Dual contact Contact 1 Contact 2
Current operated Current > 10% Current < 10%
of range of range

Pulse mode is used for setting the current level in devices
sensitive to heating, and allows current to be injected for 600ms
and the current recorded.

Current operated mode operates on one output phase
(selectable).

Protection and Safety

The unit is protected by electronic over current and duty cycle
trips on the outputs, thermal monitoring on the power
components, and fuses on the input and regulator. An earth
terminal is provided for connection to a local earth. The unit is
designed to comply with BSEN61010, and is CE marked.

Temperature Range

Storage -20°C to 60°C Operating 0°C to 45°C

Dimensions Weight

380mm x 314mm x 221mm 21kg

Including handle and corner protectors

Accessories

Operating manual, output lead set, mains lead, spare fuse set

Optional Accessories

Delta-Star supply transformer, filter unit, printer, ADMlog
Windows PC software.

Optional Delta-Star Supply Transformer

The optional delta-star supply transformer allows operation from
115V, 230V, 400V, and 440V 3 wire supplies, is selected by a
switch on the unit. An auxiliary single phase output is also
provided to supply power to a DVS3
voltage source.

Input: 115V, 230V, 400V,
440V ±10% 3 wire

3 phase 1500VA max
3φ output: 400V 4 wire 600VA

1 min on/15 min off
1φ output: 230V 300VA

5 min on/15 min off

Note: Due to the company’s continuous research programme, the information above may change at any time without prior notificatio n. Please check that you have the most recent data on the product.

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50A-3PH Data sheet rev 6 19/9/05

T&R Test Equipment Ltd, 15-16 Woodbridge Meadows, Guildford, Surrey, GU1 1BJ, UK

Tel: [phone] Fax: [phone] email: [e-mail]

www.trtest.com