- 20kVA 5 minute output capability (higher overload currents for 1s)
- Multi-function digital timing
- 5000A and 6000A loading units
- Separate control and loading units
- Secondary injection up to 100A
- Direct reading CT ratio and polarity
- True RMS metering with 1 cycle capture
- Data storage to USB memory key including waveform & harmonics
- USB keyboard interface
 Datasheet
|
- High Current Output Leads
- Designed for PCU1-SP Mk2 + NAL2000
- Copper bar terminations
- 2000A Rating
- 1.5m long
- High Current Output Leads
- Designed for PCU1-SP Mk2 + NAL2000
- Copper bar terminations
- 2000A Rating
- 3m long
- High Current Output Leads
- Designed for PCU1-SP Mk2 + NAL2000
- Copper bar terminations
- 2000A Rating
- 5m long
- High Current Output Leads
- Designed for PCU1-SP Mk2 + NAL5000
- Copper bar terminations
- 5000A Rating
- 2m long
- High Current Output Leads
- Designed for PCU1-SP Mk2 + NAL5000
- Copper bar terminations
- 5000A Rating
- 3m lon
- Exceptional versatility and reliability
- Two output taps for a wide range of load impedances
- Configurable maximum current: 200A on the 60V range or 100A on the 120V range
- Seamless connection to the Control Unit with included interconnect lead
- Designed to meet the stringent requirements of BS EN61010
- Duty cycle trip and thermal protection for enhanced safety
- Exceptional versatility and reliability
- Three output taps for a wide range of load impedances
- Configurable maximum current: 2000A on the 4V range, 1000A on the 8V range or 500A on the 16V range
- Seamless connection to the Control Unit with included interconnect lead
- Designed to meet the stringent requirements of BS EN61010
- Duty cycle trip and thermal protection for enhanced safety
- Exceptional versatility and reliability
- Three output taps for a wide range of load impedances
- Configurable maximum current: 5000A on the 2.3V range, 2500A on the 4.6V range or 1250A on the 9.2V range
- Seamless connection to the Control Unit with included interconnect lead
- Designed to meet the stringent requirements of BS EN61010
- Duty cycle trip and thermal protection for enhanced safety
- Primary current injection up to 750A
- 4V output
- 16V 40A output for secondary injection
- True RMS digital metering with single cycle capture
- Data storage to USB memory key including waveform & harmonics
- Multi-function timing system
- Large back-lit liquid crystal display
- Thermal and over-current protection
- Automatic switch-off at end of test
- Compact and portable
- Automatic mains voltage selection
- Clear and simple user interface
- Available in Metal or Pelican case
| Datasheet |
| User Manual |
- Primary injection up to 750A
- 4V output*
- 16V 40A output for secondary injection
- True RMS memory ammeter with single cycle capture
- Multi-function timing system
- Large back-lit liquid crystal display
- Thermal and over-current protection
- Automatic switch-off at end of test
- Compact and portable
- Automatic mains voltage selection*
| Datasheet |
- Primary injection up to 750A
- 4V output
- 16V 40A output for secondary injection
- True RMS digital metering with single cycle capture
- Multi-function timing system
- Large back-lit liquid crystal display
- Thermal and over-current protection
- Automatic switch-off at end of test
- Compact and portable
- Automatic mains voltage selection
- Clear and simple user interface
| Datasheet |
The PCU1-SP Mk3 is a versatile primary current injection test system, ideal for stability and circuit breaker testing, with direct-reading CT ratio and polarity tests.
- 5kA maximum output current (higher overload currents for 2s)
- Multi-function digital timing system
- Digital true RMS memory ammeter
- Solid state switching
- 200A, 2000A and 5000A loading units
- Three range outputs on NLU2000 & NLU5000 Loading Units
- Rugged, compact design
- Optional trolley mounting of system
- Secondary injection up to 100A
- Auxiliary metering input
- Direct reading CT ratio and polarity
 Datasheet |
| User Manual |
- 5kA maximum output current (higher overload currents for 2s)
- Multi-function digital timing system
- Digital true RMS memory ammeter
- Solid state switching
- 200A, 2000A and 5000A loading units
- Three range outputs on loading units
- Rugged, compact design
- Optional trolley mounting of system
- Secondary injection up to 100A
- Auxiliary metering input
-
Direct reading CT ratio and polarity
| Datasheet |
- 5kA maximum output current (higher overload currents for 2s)
- Multi-function digital timing system
- Digital true RMS memory ammeter
- Solid state switching
- 200A, 2000A and 5000A loading units
- Three range outputs on loading units
- Rugged, compact design
- Optional trolley mounting of system
- Secondary injection up to 100A
- Auxiliary metering input
-
Direct reading CT ratio and polarity
|
Datasheet
|
Primary Testing (PCITS)
Primary testing (PCITS) involves applying real operating currents and voltages to power systems, including switchgear, transformers and protection systems. It verifies the correct operation of protection functions, switching devices, grounding systems and ensures that an installation is safe and compliant before commissioning or maintenance.
FAQ
What does primary testing (PCITS) include?
Injection of primary currents and voltages, operation checks of protection and switching devices, verification of grounding, potential conditions and de-energisation.
How does primary testing differ from secondary testing?
Primary testing uses real operating currents through the full system. Secondary testing injects simulated signals directly into protection relays without stressing the entire installation.
Which equipment is used?
High-current sources, high-voltage sources, current and voltage transformers, earth-testing devices, relay testing systems and dead-check voltage testers.
Which protection functions can be verified?
Overcurrent protection, distance protection, differential protection, earth-fault protection, trip sequences, interlocking and time-graded protection functions.
Why is primary testing more reliable?
Because it tests the complete chain — instrument transformers, protection relays, wiring and circuit breakers — under realistic conditions.
When is primary testing mandatory?
Before commissioning, after refurbishment or modification, after replacing protection devices or CTs/VTs, or after incidents that may affect system safety.
What risks remain if primary testing is skipped?
Incorrect relay behaviour, faulty wiring, CT/VT errors, poor grounding, delayed tripping or failure of the protection system during faults.
Which parameters are typically measured?
Primary current, primary voltage, trip times, switching behaviour, contact resistance, short-circuit current response and grounding values.
How is de-energisation verified?
Using certified voltage testers, grounding and short-circuiting equipment and visual checks of isolation points.
Who is responsible for risk assessment?
The test supervisor or qualified electrical person planning and executing the test.
How long does primary testing usually take?
From a few minutes for single protective functions up to several hours for a full installation.
What documentation is required?
Test currents/voltages, measured values, trip times, switching states, grounding conditions, date, technician and an overall assessment.
Can primary testing be done on energised equipment?
No — it must be performed on safely isolated or prepared equipment.
Which faults can be detected?
Incorrect wiring, faulty relays, CT/VT issues, poor connections, grounding problems and delayed or failed tripping.
What requirements apply to test equipment?
Adequate output capacity, safe insulation, defined ranges, self-tests and compatibility with protection devices.
How is switching device interaction evaluated?
By measuring switching times, contact bounce, synchronisation and behaviour under primary current.
Can transformers be tested using PCITS?
Yes — e.g. winding resistance, ratio, short-circuit impedance, magnetizing current and grounding path.
Is PCITS suitable for acceptance testing?
Yes — primary testing is a key part of commissioning in medium-/high-voltage installations.
What happens if a test fails?
The installation must remain out of service until the issue is repaired and a complete re-test is performed.
What qualifications are required?
Knowledge of high-voltage systems, protection engineering, safety procedures and test equipment handling.