Atec T-R-PCU1 User Manual

PCU1-SP

Primary Current

PCU1-LT

Injection Systems

PCU1-SP & NLU5000 with

optional trolley

Features (PCU1-LT and PCU1-SP)

• 5kA maximum output current
(higher overload currents for 2s)

• Multi-function digital timing system

• Digital true RMS memory ammeter

• Solid state switching

• 2000A and 5000A loading units

• Three range outputs on loading units

• Rugged, compact design

• Optional trolley mounting of system

PCU1-SP Additional Features

• Secondary injection up to 100A

• Direct reading CT ratio and polarity

The PCU1 series are

medium powered primary current
injection systems offering output currents up to 5000A. The
system consists of a separate control unit containing all
metering and control functions and a loading unit that
provides the high current output. The PCU1-LT and PCU1­SP are ideally suited to primary current injection, stability
testing and circuit breaker testing. In addition, the SP
version offers direct-reading CT ratio and polarity tests and
a 100A secondary injection output. T&R also offer the
higher-powered PCU1-HP and PCU2.

Feature PCU1-LT PCU1-SP PCU2

Primary injection

Max output power

Secondary injection
CT ratio/polarity test

Two loading units are available, delivering a maximum output
current of 2000A or 5000A. Each loading unit has three
output taps to allow for a wide range of load impedances.
For example, the NLU5000 may be configured to either give
a maximum current of 5000A on the 2.3V range, 2500A on
the 4.6V range or 1250A on the 9.2V range.

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11.5kVA
40s

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11.5kVA
40s

20kVA

5 min

The control units are rated at 11.5kVA with a 2 second
overload capability of 23kVA using pulse mode. All metering
is digital and a memory facility is provided to hold the current
reading when the output trips or is switched off. The current
is thyristor controlled and is automatically switched off when
the device under test trips.

The PCU1 systems have a high accuracy timing system,
allowing timing tests to be carried out to a resolution of 1ms.
Selection for normally open or normally closed contacts is
automatic, and the status of the contacts is shown on the
front panel.

Output current Range Output state

Timer Auxiliary metering

Timing modes are available to test under and over current
devices, re-closers, under and over voltage devices, current
trips and circuit breakers. A full range of high current output
leads are available to complement the system in a range of
lengths.

1.000kA 5kA On

000.000s 5000.:5ACT

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PCU-LT/PCU1-SP Control Unit Specification

Loading Unit Current Metering

The AC output current is metered by a true RMS memory
ammeter (acquisition time 200ms) with a liquid crystal display.
The current metering has 3 ranges corresponding to 10%, 50%
and 100% of the maximum rating of the loading unit. In addition,
a 200% metering range is enabled in pulse mode.

NLU2000
Range Full scale Resolution Accuracy

10% 200.0A 0.1A ±0.5%rdg+5d*
50% 1000A 1A ±0.5%rdg+5d*
100% 2000A 1A ±0.5%rdg+5d*
200% 4000A 1A ±1%rdg+5d**

NLU5000
Range Full scale Resolution Accuracy

10% 500.0A 0.1A ±0.5%rdg+5d*1
50% 2500A 1A ±0.5%rdg+5d*1
100% 5000A 1A ±0.5%rdg+5d*1
200% 10kA 10A ±1.5%rdg+5d*2

*1

1.5% rdg+5d in pulse mode *2selected in pulse mode

Timing System

The PCU1 systems have a flexible timing system with two
contact inputs and 5 operating modes. Each contact circuit
automatically selects for N/O or N/C contacts, and the status of
each contact input is shown by an LED. The timing channels
may also be triggered by a dc voltage between 24 and 240V.

Secondary Injection Output (PCU1-SP only)

The secondary current injection output on the unit has two taps,
allowing the injection of currents up to 100A.

Output Range Continuous Intermittent current
current 5min on*5 1 min on*5

0-5V 33A 67A 100A
0-16V 10A 20A 30A

*5

All on times must be followed by an off time of 15 minutes

Metering Range Resolution Accuracy Current trip

10.00A 0.01A ±0.5%rdg+5d 10.5A

20.00A 0.01A ±0.5%rdg+5d 21A

100.0A 0.1A ±0.5%rdg+5d 100A
The output is protected by electronic trips and a circuit breaker.

Supply Requirements

230V±10%, 45-65Hz 1ph 11.5kVA max (23kVA overload for 2s)

Control Unit Standard Accessories

Mains lead (5m), loading unit power and metering leads (5m),
operating manual and spare fuses.

Dimensions

PCU1-SP/PCU1-LT 450(w) x 275(h) x 305mm(d)
NLU2000/NLU5000 450(w) x 275(h) x 370mm(d) incl. terminals

Weight

PCU1-LT 23kg PCU1-SP 26kg
NLU5000 55kg NLU2000 50kg

Timer resolution 1ms
Timer full scale 999.999s
Timer accuracy ±0.01%rdg+2d (4d current mode)
Contact O/C voltage 24V
Contact S/C current 20mA
Vdc input range 24-240Vdc

Timer mode Timer start Timer stop

Internal Start ‘On’ button Contact
Single contact Contact 1 Contact 1
Dual contact Contact 1 Contact 2
Current operated *3 Current >20% rng Current <20% rng
Pulse mode 0.2s *4 ‘On button’ 0.2s
Pulse mode 0.5s *4 ‘On button’ 0.5s
Pulse mode 1s *4 ‘On button’ 1s
Pulse mode 2s *4 ‘On button’ 2s

Contact 1

I<20% range

Off Setting position

*3

Current operated mode is used to time circuit breakers with no

auxiliary contacts. The timer is started when the current exceeds
20% of the selected metering range (e.g. 100A on the NLU5000
500A range). The timer stops when the current falls.

*4

Pulse mode applies current to the load for a maximum of the

specified time. If contact set 1 changes state or the current
drops below 20% of the metering range during the pulse time,
the timer is stopped. The maximum output current is increased
in pulse mode. The maximum obtainable current is set by the
impedance of the test object and output leads.

Temperature Range

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

Protection and Safety

The PCU1 series and loading units are CE marked and are
designed to meet the requirements of BS EN61010. The system
is protected by electronic trips on the outputs, circuit breakers on
the mains input, control unit output and secondary injection
output (PCU1-SP only). The unit also has a duty cycle trip on
the loading unit output and the loading unit has comprehensive
thermal protection.

Optional Loading Unit Specifications

Two loading units are available to provide a range of output
currents suitable for different primary injection tasks. Each
loading unit has three output taps allowing current injection into a
wide range of loads of differing impedances. Optional output
lead sets are also available (see www.trtest.com for details).

NLU5000 Loading Unit Intermittent Ratings

Output Maximum current
Voltage* Cont. 5 min 1 min 40s

2.3V 1500A 3000A 4500A 5000A

4.6V 750A 1500A 2250A 2500A

9.2V 375A 750A 1125A 1250A

NLU2000 Loading Unit Intermittent Ratings

Output Maximum current
Voltage* Cont. 5 min 1 min 40s

3.5V 600A 1200A 1800A 2000A

6.9V 300A 600A 900A 1200A

13.8V 150A 300A 450A 500A

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

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

www.trtest.com

PCU1-LT-SP Data Sheet rev 4 28/12/05