Method for checking secondary wiring of three-phase or two-phase current inductors by using single-phase alternating current
A technology of current transformer and single-phase AC, which is applied in the field of high-voltage power supply and distribution system construction, achieving the effect of less equipment, ensuring safety and simple operation
Inactive Publication Date: 2019-04-16
MCC TIANGONG GROUP
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Therefore, only by ensuring the correct secondary wiring of the current transformer can the reliable operation of the current protection in the event of a fault be guaranteed, thereby ensuring the safety of equipment and personnel, otherwise it will affect the production of the factory and cause major economic losses
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[0010] A method for checking the secondary wiring of three-phase or two-phase current transformers by using single-phase alternating current, which adopts the principle of three-phase current vector relationship, requires two people to operate, one person adds single-phase alternating current, and one person measures the current transformer secondary current.
[0011] like figure 1 Shown: The detection method for the secondary wiring of the three-phase current transformer is: the secondary winding of the three-phase current mutual induction of A, B, and C adopts the Y connection method, that is, the three-phase sum type connection, and the current relationship is: I Y-N =I A +I B +I C , the method is: put the P of the primary side of the A-phase current transformer 2 terminal and B-phase current transformer primary side P 1 Terminal, B-phase current transformer primary side P 2 terminal and C-phase current transformer primary side P 1 Terminals are connected with large ...
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The invention discloses a method for checking the secondary wiring of three-phase or two-phase current inductors by using single-phase alternating current. The method comprises the following steps that the primary side of the three-phase current inductor A, the primary side of the three-phase current inductor B and the primary side of the three-phase current inductor C are sequentially connected in series along the plurality, the primary side of the two-phase current inductor A and the primary side of the two-phase current inductor C are sequentially connected in series along the plurality, and the single-phase alternating current is added to the primary sides of the current inductors which are connected in series; if the three phases are all provided with the current inductors, phase current of each phase of the secondary side of each three-phase current inductor, and Y point-ground (N) current are measured; and if the two phases are provided with the current inductors, phase currentof each phase of the secondary side of each two-phase current inductor, and Y point-ground (N) current are measured. According to the method, whether the secondary wiring of the current inductors is positive or not can be judged through the number relation between the phase current and the Y point-ground (N) current, the operation reliability of the current protection during an fault can be effectively ensured by adopting the method, and therefore the safety of equipment and personnel is ensured.
Description
Technical field: [0001] The invention belongs to the construction field of high-voltage power supply and distribution systems, in particular to a method for checking secondary wiring of three-phase or two-phase current transformers by using single-phase alternating current. Background technique: [0002] High-voltage power supply and distribution are widely used in various industrial fields. Current transformers are current detection components in high-voltage power supply and distribution systems, used for current protection and current measurement. When an electrical short-circuit fault occurs, whether the current protection is reliable and accurate, and whether the fault can be quickly removed is directly related to the safety of electrical equipment and personal safety. Therefore, only by ensuring the correct secondary wiring of the current transformer can the reliable operation of the current protection in the event of a fault be guaranteed, thereby ensuring the safety ...
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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 张冠军
Owner MCC TIANGONG GROUP