The General Electric PST1-1 is a portable secondary injection test set designed for on-site testing of Power Sensor Trip Devices Types PS-1, PS-1A, and PS-1A-1. These trip devices are used on low voltage power circuit breakers Types AK-25, AK-50, AK-T50, AK-75, AK-100, and AKR-50.
Functions:
Purpose:
Features:
Resources:
Functions:
- Checks current pick-up: Determines if the trip device activates at the correct current levels.
- Tests time-current characteristics of long time delay bands: Verifies the time it takes for the breaker to trip under different overcurrent conditions within the long time delay setting.
- Tests the Logic Unit independently: Allows for separate testing of the trip logic.
- Tests the combination of Logic Unit, Power Supply Unit, Magnetic Trip device, and associated wiring: Checks the interaction of these components while installed in a de-energized breaker.
- Checks load carrying: Assesses the ability of the system to carry a specific load for a duration.
- Checks time delay bands of the short time and ground fault elements: Verifies the tripping times for short circuit and ground fault conditions.
Purpose:
- Verifies the operational settings and characteristics of the solid-state trip device (the “decision-making” part of the circuit breaker).
- Allows testing without the need for high-current primary injection test equipment.
- Can be less time-consuming and generally safer than primary injection testing.
Features:
- Portable: Designed for easy transportation and on-site use.
- Facilitates testing while the trip device is installed in a de-energized breaker.
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