Method for realizing serial connection work of direct current shunt tripping device and direct current middle relay

Abstract

The invention relates to a method for realizing the serial connection work of a direct current shunt tripping device and a direct current middle relay. The method comprises the following steps that: after a press button switch connected in parallel with the direct current middle relay is switched on, the direct current input total voltage of a serial connection circuit is equal to the direct current input voltage of the direct current shunt tripping device; when the direct current input voltage is greater than 70 percent of the rated voltage Ue of the direct current shunt tripping device, a false load resistor in a hysteresis false load control circuit is switched off, and meanwhile, after a voltage detection and pulse forming circuit detects that the direct current input voltage is grater than 70 percent of the rated voltage Ue, and a single-time pulse signal lasting 50 to 60ms is generated; and the single-time pulse signal is amplified through a driving circuit, then, a shunt electromagnetic coil is controlled to be electrified and conducted, an armature arranged in the direct current shunt tripping device works, and the switch-off operation is realized. When the condition that the direct current input voltage is smaller than 10 percent of the rated voltage is detected, the pulse signals are not generated, and the shunt electromagnetic coil is not conducted.

Description

technical field [0001] The invention relates to a method for a DC shunt release and a DC intermediate relay to work in series. Background technique [0002] The shunt release is used to receive the remote control voltage and is the core component to realize the "remote control" opening of the low-voltage circuit breaker. For example, in civil buildings where fire protection requires a power outage circuit, a circuit breaker with a shunt release can be selected. The fire alarm system can remotely control the opening of the circuit breaker through modules or cables in the fire center. [0003] Existing DC shunt releases are all short-time working systems, and cannot be connected (operated) to the power supply for a long time, and the power-on time generally cannot exceed 1 second, otherwise it is very easy to burn the coil in the shunt electromagnet coil; in addition, if The DC intermediate relay is connected in series with the DC shunt release. Due to the low voltage obtaine...

AI Technical Summary

Problems solved by technology

[0003] Existing DC shunt releases are all short-time working systems, and cannot be connected (operated) to the power supply for a long time, and the power-on time generally cannot exceed 1 second, otherwise the coil in the shunt electromagnet coil is easily burned; in addition, if The DC intermediate relay is connected in series with the DC shunt release. Due to the series voltage division, the voltage obtained by the DC intermediate relay is too low, and the DC intermediate relay cannot work normally, so the DC shunt release cannot work in series with the DC intermediate relay.

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