SCITS / PCITS

About Primary and Secondary Current Injection Test Sets

In electrical testing, Primary Current Injection Test Sets and Secondary Current Injection Test Sets are both important tools. They help check if protection systems like relays and circuit breakers are working properly. Primary sets test the whole system under real conditions, while secondary sets focus on testing just the relays and control logic. Using both gives you a complete picture of how your electrical systems are performing.

Primary Current Injection Test Sets

Primary Current Injection Test Sets are designed to send high current through the main power path of your system. This lets you test how current transformers, breakers, and relays respond to real-life loads or faults. These sets are especially useful during commissioning or maintenance of high-voltage systems like substations or industrial switchgear.

Many modern Primary Current Injection Test Sets include automatic controls and digital displays, making the testing process faster and easier. They help you make sure your protection equipment is set up correctly and ready to handle real electrical faults.

Why Use Primary Current Injection Test Sets?

• Full-system testing: Checks the entire protection chain, from transformers to circuit breakers.
• Real-world conditions: Simulates actual fault scenarios for accurate results.
• Great for commissioning: Ensures everything works correctly before going live.

Secondary Current Injection Test Sets

Secondary Current Injection Test Sets are used to test protective relays without energizing the full system. Instead of sending current through the entire power path, they inject it directly into the relay’s input. This is much safer and more convenient for routine testing or troubleshooting.

These test sets are lightweight, portable, and great for fieldwork. Secondary Current Injection Test Sets are especially useful for checking digital relays or updating protection settings without shutting down your equipment.

Why Use Secondary Current Injection Test Sets?

• Safe and simple: No need to power up the full system.
• Accurate testing: Helps verify relay settings and responses.
• Time-saving: Ideal for quick checks and regular maintenance.

Comparing Primary vs Secondary Current Injection Test Systems

While both Primary Current Injection Test Sets and Secondary Current Injection Test Sets help make sure your protection system works, they serve different purposes.

• Primary Test Sets test the whole system and are great for first-time installations or major overhauls.
• Secondary Test Sets are easier and quicker to use, making them perfect for routine checks and updates.
• Using both types of test sets gives you a full understanding of your system’s performance and safety.

Need help choosing the right test set? Contact our friendly team today. We're happy to help you find the best Primary Current Injection Test Set or Secondary Current Injection Test Set for your project.