Warning detection device and method for disconnection of N line of secondary circuit of current transformer

By collecting current signals from the N-line and phase lines of the secondary circuit of the current transformer, using the three-phase load imbalance characteristics, detecting the N-line disconnection and issuing alarm information, the problem of the inability to detect the N-line disconnection in the existing technology is solved, and the safe and stable operation of the power system is achieved.

CN119716644AInactive Publication Date: 2025-03-28STATE GRID FUYANG POWER SUPPLY COMPANY
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Patent Information

Application Number
CN202311599458.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-11-24
Publication Date
2025-03-28
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing relay protection device cannot detect that the N-line of the secondary circuit of the current transformer is broken, resulting in malfunction and refusal of relay protection, affecting the safe and stable operation of the power system.

Method used

The current acquisition unit collects the winding N-line current I0 and phase current Iph. Taking advantage of the three-phase load imbalance, when I0 is zero and Iph is not zero, it is determined that the secondary circuit N-line is broken, and an alarm message is issued through the local detection unit to detect the server to record the fault information.

Benefits of technology

It realizes that when the primary system does not have power outage, the N-line disconnection of the secondary circuit of the current transformer is detected in real time, alarm information is issued in a timely manner, fault location is located, and fault location is reduced, and the security and stability of the power system is improved.

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Abstract

The invention provides an alarm detection device for disconnection of a secondary circuit N line of a current transformer, a current acquisition unit acquires a winding N line current I0 and a corresponding phase current Iph, a local detection unit is connected with the current acquisition unit, and whether the secondary circuit N line of the current transformer is disconnected is judged according to the winding N line current I0 and the corresponding phase current Iph. When it is judged that the line is broken, early warning is carried out; and the detection server records the time when the local detection unit sends the early warning signal, the equipment model and the position for providing data support for subsequent fault analysis. The invention also provides a current transformer secondary circuit N line breakage alarm detection method. The method does not need an external secondary circuit, is simple in implementation process, does not affect the normal operation of a protection device, can detect the disconnection of the N line of the secondary circuit of the current transformer in real time under the condition that a primary system is not powered off, gives out alarm information when a fault occurs, locates the fault position, timely notifies a maintainer to deal with the fault, and reduces the time when the fault exists.
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