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About Primary Current Injection and Secondary Current Injection Test Systems

In the dynamic field of electrical power systems, the choice between Primary Current Injection and Secondary Current Injection Systems depends on the specific testing requirements and safety considerations. While PCITS excel in providing a realistic simulation of extreme conditions for comprehensive testing, SCITS offer a more controlled and precise approach for relay testing. Both play crucial roles in ensuring the reliability and functionality of protective devices, contributing to the overall safety and performance of power distribution systems.


Primary Current Injection Systems:

Primary Current Injection (PCITS) systems are designed to deliver high current directly to the primary circuit, replicating actual operating conditions. These systems employ powerful transformers and generators capable of producing currents ranging from hundreds to thousands of amperes. The primary objective of PCITS is to evaluate the response of protective devices, such as circuit breakers and relays, under extreme conditions.

PCITS are often used during commissioning or maintenance of power distribution systems. They are efficient in testing high-voltage equipment, providing a comprehensive evaluation of the entire protection scheme. The high current levels produced by PCITS enable engineers to identify potential faults and weaknesses in protective devices, ensuring they respond appropriately in case of a real fault.


Advantages of Primary Current Injection Systems:

Realistic Simulation: PCITS replicate actual operating conditions, offering a realistic testing environment for protective devices.

Comprehensive Testing: High current levels enable thorough testing of protective relays, ensuring their reliability under extreme conditions.

Commissioning Support: PCITS is particularly useful during the commissioning phase, allowing engineers to validate the entire protection scheme of a power system.


Secondary Current Injection Systems:

While Primary Current Injection systems are powerful tools for comprehensive testing, Secondary Current Injection (SCITS) systems serve a different purpose. SCITS inject current into the secondary side of the instrument transformers, simulating the current flowing through the primary circuit. These systems are commonly used for relay testing, offering a more controlled and manageable approach.


Advantages of Secondary Current Injection Systems:

Precision Testing: SCITS provide precise control over the injected current, allowing engineers to test relays at various settings without exposing the primary circuit to high currents.

Safety: Since SCITS inject current into the secondary side, they pose lower risks compared to PCITS, making them safer for routine relay testing.

Versatility: SCITS are versatile and can be used for testing a wide range of protective relays, making them suitable for both commissioning and routine maintenance.


Primary Current Injection Vs Secondary Current Injection Test Systems:

While both PCITS and SCITS are integral to the testing and maintenance of power systems, their applications and advantages differ.

Application: PCITS are well-suited for testing the entire protection scheme during commissioning or maintenance of high-voltage equipment. In contrast, SCITS are more focused on relay testing, providing precision and control.

Safety Considerations: PCITS involve injecting high currents directly into the primary circuit, posing higher safety risks. SCITS, on the other hand, offer a safer alternative for routine relay testing.


If you have any questions contact our friendly team today - experts are here to advise on the full range of testers suited to your particular protection application.