Device for controlling and protecting operating state of single-phase detection equipment

Abstract

The invention discloses a device for controlling and protecting the operating state of single-phase detection equipment. The device for controlling and protecting the operating state of the single-phase detection equipment comprises a CLOSE_IND0 input end and an OPEN_IND0 input end and further comprises a first AND gate, a second AND gate, a third AND gate, an RS latch, a first NOT gate and a second NOT gate, wherein the CLOSE_IND0 input end and the OPEN_IND0 input end are used for receiving operating state signals of the single-phase equipment, and the first AND gate, the second AND gate and the third AND gate are all double-end-input AND gates. According to the device for controlling and protecting the operating state of the single-phase detection equipment, the RS latch is added to the equipment operating state judgment logic, and thus the operating state of the equipment can be accurately judged and be applied to relevant logic calculation through the device under the condition that a signal input system is abnormal through the characteristic of the RS latch that a prior state can be kept and output.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control and protection device for detecting the operating state of single-phase equipment. Background technique [0002] The operating status of single-phase equipment in AC-DC transmission projects, such as primary and secondary equipment such as DC circuit breakers, switches, ground switches, and air switches, is closely related to many functions of the control and protection system. When the single-phase equipment operation status signal input system is abnormal, it will inevitably lead to the control and protection system misjudging the operation status of the single-phase equipment, causing abnormal operation of the control and protection device, and in severe cases, it will directly cause the control and protection device to malfunction or refuse to operate, affecting Safe and stable operation of the power grid. For example, in a DC transmission project, when t...

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Problems solved by technology

[0005] (2) When the single-phase equipment closing state signal input system is abnormal, it may cause the control and protection device to misjudge that the single-phase equipment is in the opening position, which will cause some functions in the control and protection system to exit or become unavailable, and the control and protection system cannot meet the current system requirements. operating mode requirements

[0006] (3) When the single-phase equipment opening state signal input system is abnormal, it may cause the control and protection device to misjudge that the single-phase equipment is in the closing position, which will lead to abnormal input or unavailability of some functions in the control and protection system, and the control and protection system cannot meet the current requirements. Requirements for how the system operates

[0007] (4) When the signal input system is abnormal, it may cause the opening and closing status information of the single-phase equipment sent to the control and protection system to be 1. According to the existing judgment logic, the control and protection system will consider the status of the single-phase equipment to be undefined. That is, the single-phase equipment is neither in the closing position nor in the opening position. At this time, some functions of the control and protection system will fail, which cannot meet the system operation requirements.

[0008] (5) Any abnormality in the auxiliary contact or signal input circuit of single-phase equipment may cause the control and protection device to malfunction or refuse to operate

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