Applies color TV delay circuits to heavy closures ----- Delay Switch

Keywords: delay switch circuit diagram Author: Zhang Zujun Some small enterprise main distribution dispensers are configured with DW class semi-automatic universal circuit breakers. The circuit breaker has a protection function such as an outbound trip, overload delay trip, and instantaneous overflow. The disadvantage is that the high-voltage recovery is required to manually press the closing button, and the DW is closed to supply power to the load. Complete the power distribution task. This will wait for a special person. In order to come The entire circuit connection and component parameters are shown in the figure, and the dashed box is added to the homemade. The AC 12V is rectified and filtered to C2 charging. After the delay is 1 second, the triode V1 is turned on. Relay J normally open contacts. After 2 seconds, the relay is released, complete the analog HA button closing action. R1 and LEDs are loads when transformer are loaded, and they are used as a heat relay overcurrent indicator. This circuit retains the protection function of the overload of the power supply. When the electricity circuit is overloaded or short-circuited, the secondary current of the current transformer passes through the heat relay RJ, and the delay time of any phase current exceeds its set value, or when the short-circuit current exceeds the tensile current value of 6 times, large The current causes the RJ bimetal sheet to drive its auxiliary contacts (RJ assisted contact reset should be adjusted in manual reset), the trip unit FQ coil is absent, and the linkage mechanism trips can avoid transformer B damage. After the fault is excluded, the RJ contact has been disconnected, the coincidence circuit is owed to the working current, and it must be manually reset the RJ contact, and the heavy gate circuit can obtain electricity, the relay J often contacts once. Control box street to the closing signal, the closing electromagnet performs the closing command, and the energy storage spring maintains its closing oblimination after the DW. Automatic reclosing program operation ends.

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