CN202330690U - Secondary conversion circuit for detection of current transformer - Google Patents

Abstract

The utility model discloses a secondary conversion circuit for the detection of a current transformer. The secondary conversion circuit is characterized by comprising a first double pole single throw switch and a second double pole single throw switch, wherein the first double pole single throw switch comprises a first primary static contact, a first secondary static contact, a first primary movable contact and a second secondary movable contact; the second double pole single throw switch comprises a second primary static contact, a second secondary static contact, a second primary movable contact and a second secondary movable contact; the first primary contact is connected with the first primary movable contact after passing through the second primary contact through a wire; the first secondary static contact is connected with the second primary contact through a wire; and the second secondary static contact is connected with the second secondary movable contact through the first secondary movable contact. By a rational circuit design, frequent secondary winding transformation is simplified when a multi-winding current transformer is subjected to an error test, the working strength of a tester is effectively weakened under the condition of no influence on a test result, test time is shortened, and working efficiency is improved.

Description

A kind of current transformer detects the secondary change-over circuit

Technical field

The utility model relates to a kind of aid that detects current transformer.

Background technology

Current transformer is a kind of special transformer that is used for electric system or other electrical devices for surveying instrument, instrument, relay and other similar electric power supply; The winding of measurement and protection winding are generally arranged in the current transformer simultaneously, and when carrying out the error-detecting of current transformer, insert the detecting instrument except requiring winding to be detected; The necessary short circuit of remaining winding; Cause when carrying out error-detecting, the frequent change detection line, time-consuming.

The utility model content

The purpose of the utility model provides a kind of current transformer simple in structure and detects the secondary change-over circuit.

To achieve these goals; Adopt following technical scheme: a kind of current transformer detects the secondary change-over circuit; It is characterized in that: said circuit comprises first double-pole single throw and second double-pole single throw; Wherein first double-pole single throw comprises the one one stationary contact, the one or two stationary contact, the one one moving contact and the one or two moving contact, and second double-pole single throw comprises the 21 stationary contact, the two or two stationary contact, the 21 moving contact and the two or two moving contact;

The one one stationary contact links to each other with the one one moving contact behind the 21 moving contact through lead, and the one or two stationary contact links to each other with the 21 stationary contact through lead, and the two or two stationary contact links to each other with the two or two moving contact through the one or two moving contact through lead.

The utility model is through reasonable circuit design, and when many winding currents transformer error was tested, frequent Secondary Winding thread-changing was simplified; Under the situation that does not influence test findings; Effectively reduce the working strength of testing crew, reduced test period, improved work efficiency.

Description of drawings

Fig. 1 is the circuit structure diagram of the utility model.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is further specified.

As shown in Figure 1, when first double-pole single throw 1 that closes, when breaking off second double-pole single throw 2.The one one moving contact 11 ＇ of the detecting instrument K point and first double-pole single throw join; Electric current is through the one one stationary contact 11, Current Transformer Secondary 1SA end inflow current mutual inductor, successively through Current Transformer Secondary 1SB end, the one or two stationary contact the 12, the 1 moving contact 12 ＇, the two or two moving contact 22 ＇ from the outflow of Z end.Simultaneously, form short-circuited conducting sleeve by another winding of current transformer through 2SA, the 21 stationary contact the 21, the 1 stationary contact the 12, the 1 moving contact 12 ＇ the two or two stationary contact 22,2SB, with another short circuit in winding of current transformer.

When second double-pole single throw 2 that closes, when breaking off first double-pole single throw 1.Electric current is flowed into through the one one moving contact 11 ＇ by detecting instrument K point, successively through the 21 moving contact 21 ＇, the 21 stationary contact 21 inflow current mutual inductor 2SA.Flow out by current transformer 2SB, flow into the Z point through the two or two stationary contact 22 and the two or two moving contact 22 ＇.Simultaneously form short-circuited conducting sleeve, with another short circuit in winding of current transformer by current transformer 1SA point, the one one stationary contact the 11, the 21 moving contact 21 ＇, the 21 stationary contact the 21, the 1 stationary contact 12,1SB point.

Claims (1)

1. a current transformer detects the secondary change-over circuit; It is characterized in that: said circuit comprises first double-pole single throw and second double-pole single throw; Wherein first double-pole single throw comprises the one one stationary contact, the one or two stationary contact, the one one moving contact and the one or two moving contact, and second double-pole single throw comprises the 21 stationary contact, the two or two stationary contact, the 21 moving contact and the two or two moving contact;

The one one stationary contact links to each other with the one one moving contact behind the 21 moving contact through lead, and the one or two stationary contact links to each other with the 21 stationary contact through lead, and the two or two stationary contact links to each other with the two or two moving contact through the one or two moving contact through lead.

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