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STR-P Time Relay: Wide-Range Auxiliary Supply for Reliable Protection Timing
Why Secondary Protection Circuits Need a “Durable Clock” In secondary protection and control circuits, time coordination is not a luxury – it is part of the protection function itself. Breaker failure logic, block / unblock sequences Signal latching and release Power-on delays and power-off delays Pulse extension for relay outputs or interlocking If the timing element is unstable, sensitive to supply fluctuations, or loses its settings, the entire scheme becomes harder to com
TonyZhang
Jan 155 min read
Preventing CT Open-Circuit Hazards with Modular Test Block Assemblies
One Loose Screw, One “Near Miss” – What Really Happened During commissioning of a protection scheme, an engineer completed relay calibration and started to restore the circuits. Everything looked normal—until one phase current value refused to match expectation. Further investigation revealed the cause: one CT secondary terminal screw had not been fully tightened , leaving that phase’s CT secondary circuit effectively open. The current circuit was abnormal, and the situatio
TonyZhang
Dec 12, 20254 min read
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