Converter transformer internal fault differential protection method and device
An internal fault and differential protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of large protection action time and long fault removal time, and achieve the effect of speeding up fault removal and reducing losses.
Pending Publication Date: 2022-08-09
NR ELECTRIC CO LTD +1
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[0003] The current large-difference differential protection and small-difference differential protection both set the inrush current blocking criterion due to the excitation characteristics of the converter transformer. When an internal fault occurs in the converter transformer, the protection action time is greatly affected by the inrush current blocking criterion. In some Under fault conditions, even if the differential protection quickly meets the protection action conditions, it still needs to wait for tens of milliseconds or even longer to open the inrush current blocking criterion before the differential protection can operate to remove the fault converter at the outlet, and the fault removal time is long
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[0052] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0053] like figure 2 The illustrated embodiment is a schematic diagram of a differential protection method for internal faults of a commutator transformer, including:
[0054]In the collection link of S101: collect the three-phase current of the YY converter and transformer side windings and the three-phase current of the valve side winding, and the three-phase current of the YD converter and transformer side windings and the three-phase current of the valve side winding.
[0055] The protection current is collected at various places through the current transformer, and in this embodiment...
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The invention discloses a converter transformer internal fault differential protection method, which is characterized in that whether a converter transformer internal fault occurs or not is identified by judging a relation between a YY converter transformer small-difference differential current and a corresponding threshold value and a relation between a YD converter transformer small-difference differential current and a corresponding threshold value, and a differential action element is combined to quickly act an outlet. According to the method, the fault can be quickly identified aiming at the condition of the internal fault of one converter transformer, the fault removal speed is accelerated, and the loss caused by the converter transformer fault can be effectively reduced.
Description
technical field [0001] The invention relates to the field of power system relay protection, in particular to a differential protection method and device for internal faults of a converter transformer. Background technique [0002] Converter transformer is an important part of high-voltage and ultra-high voltage DC power transmission. Correct protection and fast action of converter transformer are crucial to the safe and stable operation of DC power transmission system. According to the configuration of the converter protection, figure 1 Typical configuration diagram for commutation protection CT. When a commutator-transformer internal fault occurs, the commutator-transformer differential protection in the existing commutator-transformer differential protection adopts the incoming switch current on the commutator-transformer grid side, the winding current on the YY commutator-transformer valve side, and the YD commutator-transformer valve side winding. The current construct...
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IPC IPC(8): H02H7/12H02H7/122H02H7/125
CPCH02H1/0007H02H7/12H02H7/1225H02H7/1255Y02E60/60
Inventor 郑超张晓宇吕航程骁顾乔根莫品豪孙仲民曾亮
Owner NR ELECTRIC CO LTD