| 摘要 |
A relay employs only four OP amp IC(OA1-OA4) for overcurrent protection even in phase unbalance, wire-disconnection protection, short-circuit protection and no voltage relay (N.V.R) function. Another features are half time-delay slope correction, compact size, low cost, ammeter function and precise overcurrent setting. The relay includes power supply, current detector with current transformers (CT1-CT3), locking diodes (D1-D3), R3-R5, variable resistor (P1), linear amplifier for current detected, and signal output, starting display (LED1), storage protection, response circuit and display (LED2) when detecting overcurrent. There is no malfunctions under temperature compensation and noise.
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