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1차 주입 테스트

PI Service

전류 감지를 위한 1차 주입

“Why Primary Injection Tests?

This type of test involves the entire circuit – current transformer primary and secondary windings, relay coils, trip and alarm circuits, and all intervening wiring are checked. There is no need to disturb wiring, which obviates the hazard of open-circuiting current transformers, and there is generally no need for any switching in the current transformer or relay circuits.” Source: EEP

Validating current sensing equipment is critical for vessel owners to ensure safe operations. The most comprehensive method is primary injection testing. This involves using a specialized tool to inject a low-voltage, high-current signal directly into bus bars and cabling.

You can think of primary injection like testing a smoke detector. When you press the "test" button, you are checking if the detector can communicate a fire. But by actually injecting smoke, you confirm the sensor can properly detect a real fire. Similarly, primary injection injects a small "fault" to validate the entire sensing and protection chain.

Primary injection supports total system validation. It checks current transformers, Rogowski coils, wiring connections, and protective relays together. 

By injecting a controlled current, primary injection testing confirms:

  • Current transformer ratios match specifications

  • All devices measure current accurately within tolerance

  • Current flows through sensing equipment in the proper direction

  • Interconnected wiring is correct with no accidental transpositions


This validates the entire current measurement network. It ensures faults will be detected properly and protection systems will trip as designed. There is no possibility of misreading devices "agreeing" on an incorrect reading.

Primary injection delivers definitive validation. Owners gain confidence that current sensing equipment will perform when needed. This is vital for avoiding spurious system outages and ensuring fault clearance protects equipment.

Primary injection provides a high level of assurance without compromising safety or uptime as it can be done during shipyard.

When performed by trained technicians following procedures, it can assure owners and their clients of effective fault detection. Keeping vessels running safely and efficiently starts with robust power validation.

적용 가능한 규칙 세트

현재로서는 선박에 대한 이 테스트를 요구하는 지침이 없습니다. OneStep Power의 철학은 시운전 후 및/또는 시스템의 주요 변경 후 테스트 증거가 있는 경우 1차 주입을 5년마다 수행할 필요가 없다는 것입니다. Rogowski 코일(Rcoil) 통합 장치는 전자 장치이며 지속적으로 정확한 작동을 보장하려면 테스트 기간 및 유형에 대한 제조업체의 권장 사항을 따라야 합니다.

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