The GE Sverker 750 current injection set can be used to test virtually all types of single-phase protection especially secondary protective relay equipment. It can test three-phase protection that is able to be tested one phase at a time, protective relay systems that require phase shifting, and automatic reclosing devices. The Sverker 750 features many functions that make relay testing more efficient. Its powerful measurement section can display time, voltage, current, Z, R, X, S, P, Q phases and cost, and the voltmeter can be used as a second ammeter.

Designed to comply with EU Standards and other personal and operational safety standards, the Sverker 750 also features a serial port for communication to a PC. The output transformer is equipped with built-in temperature protection and the primary side is protected by a miniature circuit breaker. Both output ranges are divided into voltage steps of 10V that are steplessly variable.

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The GE Sverker 760 Relay Test Unit is the engineer’s toolbox and features many functions that make relay testing more efficient. Its powerful measurement section can display time, voltage, current, Z, R, X, S, P, Q, phase angle and cos φ. The voltmeter can also be used as a 2nd ammeter, for example when testing differential relays and all values are presented on a single easy-to-read display. Automatic reclosing devices and directional protective equipment can be tested by means of the built-in variable voltage source which also incorporates a continuous phase shift function.

Two or more Sverker units can also be synchronized, which enables the connection of three units into a basic 3-phase test set. 

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When performing primary current injections for a relay or current transformer test, the Omicron CP CB2 2000A Current Booster can be used with a CPC 100 to achieve the high currents required. The CP CB2 is a high voltage source which can be positioned near the device under test and it experiences low losses due to the short length of the high current connection cable.

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The Omicron CPC 100 is a powerful device which can perform testing on numerous substation components via an uncomplicated user friendly interface. It can provide up to 800 A or 2 kV on its own, or up to 2 kA or 12 kV with the use of amplifier modules, along with up to 5 kVA over a frequency range of 15 to 400 Hz or 400 A DC.  The CPC 100 features a variable output which allows the use of test frequencies different from the mains frequency offering a very effective suppression of mains-related interference for use in noisy environments. The CPC 100 can also test unconventional current transformers and integrated IEC 61850 systems via the use of sampled values, commission protection relay systems, analyze power lines and HV cables, perform grounding systems tests and when combined with additional modules perform tests on rotating machines, switchgear and circuit breakers and GIS systems.

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The T&R Test Equipment 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 unit has a range of outputs allowing injection of currents as low as a few milli-amps and as high as 50A as well as injection of voltages up to 18V available on the main outputs. Along with a memory ammeter, 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. The 50A-3PH is comprehensively protected by overcurrent, duty cycle and thermal trips and keeps the user fully informed of any trip condition. The auxiliary outputs and inputs are fuse protected for further protection.

As well as the 3 phase current outputs an auxiliary metering input is provided that can measure voltage, current, frequency and the phase between any of the current outputs and an external voltage or current. 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. The 50A-3PH can be used to test many types of single and three-phase secondary protections such as auto closers, miniature circuit breakers and over/under current, time delay, earth fault, power, tripping, IMDT and thermal relays. When used in conjunction with a DVS3 3-phase voltage source the 50A-3PH  may be used to test most types of protection requiring three voltages and three currents such as directional overcurrent relays, distance protective relays, phase angle relays and power transducers.

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The T&R Test Equipment PCU1 is a primary current injection system offering output currents up to 2000A. The system consists of a separate control unit containing all metering and control functions and a loading unit that provides the high current output. Both the PCU1-LT and PCU1-SP are ideally suited to primary current injection, stability testing and circuit breaker testing. The PCU1-SP can also perform secondary injection up to 100A and CT ratio/polarity testing. Two loading units are available, each having three output taps to allow for a wide range of load impedances. The system also features a digital true RMS memory ammeter and utilises solid state switching.

The PCU1 system has a high accuracy timing system allowing timing tests to be carried out to a resolution of 1ms. Timing modes are available to test under and over current devices, re-closers, under and over voltage devices, current trips and circuit breakers. Selection for normally open or normally closed contacts is automatic, and the status of the contacts is shown on the front panel. To ensure safe operation 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.

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