CN200969272Y - Electromagnetic current mutual inductor for dynamic analog experiment - Google Patents

Abstract

A electromagnetic current transformer for dynamic simulation test relates to dynamic simulation test system in power system, whose iron core is an airless-gap ring iron core; the winding structure of the coils are: the coil number of the secondary winding is 688 and that of the primary winding is 172; the primary winding is divided into two equal coils which are repectively rounded on the two semicircles of the iron core, and each coil is rounded for four layers; the secondary winding is is rounded for five layers, then the primary winding is unformly rounded on the external secondary coil winding. The material of iron core selects domestic Q9-0.30 cold rolling oriented silicon steel with low loss and high magnetic permeability and are rounded by seven lacquering stranded wires. The transformer model of the utility model is provided with low loss and small enough time constant, the transient saturation multiple is more than 25 at rating load capacity, the static saturation multiple is not less than 125 at rating load capacity, the precision can reach 0.1%. The utility model can monitor the operation status of the simulation system and measure the steady process, can also used for the measurement and wave recording of the transient process.

Description

The electromagnetic current transducer that dynamic analog test is used

Technical field

The utility model relates to the Electrical Power System Dynamic simulation experiment system, especially relates to used electromagnetic current transducer in a kind of Electrical Power System Dynamic simulation experiment system.

Background technology

The dynamic analog test Current Transformer selects for use specific loss low, and the homemade Q9-0.30 cold-rolled orientation silicon steel sheet that permeability is high, core structure adopt the ring structure iron core of no air gap, and through strict annealing in process.Adopt multiply enamel-cover twisted wire, select rational specified operation magnetic close, for the usage factor that improves iron core column adopted the merogenesis iron core column make core section near circular, chosen rational number of ampere turns.

At present, still there is not the design that the circuit that can satisfy accurate simulation 1000kV electric pressure is used electromagnetic current transducer.

Summary of the invention

In order to address the above problem, the purpose of this utility model provides a kind of design that can accurately simulate the circuit of 1000kV electric pressure with electromagnetic current transducer, used electromagnetic current transducer in the Electrical Power System Dynamic simulation experiment system.

The technical scheme in the invention for solving the technical problem is: the electromagnetic current transducer that dynamic analog test is used, and its iron core adopts the ring structure iron core of no air gap; The winding structure of coil is: secondary winding 688 circles, winding are totally 172 circles; One time winding is divided into two every circle 86 circles of circle, is around on two semicircles of iron core four layers of each coil windings respectively; Secondary winding is divided 5 layers of coiling, and primary winding evenly is wound on secondary coil winding skin.

Core material selects for use specific loss low, the homemade Q9-0.30 cold-rolled orientation silicon steel sheet that permeability is high, and for reducing eddy current, electromagnetic current transducer first and second coil all adopts the coiling of seven strands of enamel-cover twisted wires.

Owing to adopted above-mentioned technical scheme, the beneficial effect that the utility model had is: instrument transformer model of the present utility model has the little characteristics of own loss, and enough little time constant is arranged, the saturated multiple of transient state is greater than 25 times under the nominal load capacity, static saturated multiple is not less than 125 under the nominal load capacity, and precision can reach 0.1%.The winding method of coil is evenly reliable.This model can be used for monitoring the running status of analogue system and measuring steady-state process, also can be used to ripple is measured and recorded to transient process.

Description of drawings

Fig. 1 is the electromagnetic current transducer coil winding figure that dynamic analog test of the present utility model is used.

Embodiment

The present invention is further described below in conjunction with drawings and Examples.

Referring to Fig. 1, be electromagnetic current transducer coil winding figure of the present utility model.Core material of the present utility model selects for use specific loss low, the homemade Q9-0.30 cold-rolled orientation silicon steel sheet that permeability is high, the ring structure iron core that adopts no air gap is through strict annealing in process, and electromagnetic current transducer first and second coil all adopts the coiling of seven strands of enamel-cover twisted wires, makes that own loss is very little.

In addition, select rational specified operation magnetic close long-pending with core section, the saturated multiple of transient state is greater than 25 times under the nominal load capacity, and static saturated multiple is not less than 125 times under the nominal load capacity.Q9-0.30 cold-rolled orientation silicon steel sheet nominal operation magnetic is close to be 17000 Gausses, is satisfied 125 times saturated multiple, and the close 17000/125=136 of choosing of work magnetic of silicon steel sheet selects B=130 Gauss, core area $S=\frac{E_T\×{10}^8}{222B}$ Calculate gained.

Choosing of number of ampere turns: number of ampere turns is not only relevant with the capacity and the precision of instrument transformer, and directly influences the own loss of instrument transformer.So select rational number of ampere turns very important.Satisfying under the big situation of required precision, reducing the principle of number of ampere turns as far as possible and choose number of ampere turns.

The sectional area of wire value: for reducing the own loss of instrument transformer, current in wire density should obtain smaller.The winding method of coil: secondary winding 688 circles, winding are totally 172 circles.One time winding is divided into two every circle 86 circles of circle, is around in respectively on two semicircles of iron core, and each coil is answered four layers of coilings.Secondary winding is divided 5 layers of coiling, earlier around secondary coil, again around primary winding.

Claims (2)

1, the electromagnetic current transducer used of a kind of dynamic analog test is characterized in that: the electromagnetic current transducer iron core adopts the ring structure iron core of no air gap; The winding structure of coil is: secondary winding 688 circles, winding are totally 172 circles; One time winding is divided into two every circle 86 circles of circle, is around on two semicircles of iron core four layers of each coil windings respectively; Secondary winding is divided 5 layers of coiling, and primary winding evenly is wound on secondary coil winding skin.

2, the electromagnetic current transducer used of dynamic analog test according to claim 1, it is characterized in that: core material selects for use specific loss low, the homemade Q9-0.30 cold-rolled orientation silicon steel sheet that permeability is high; Electromagnetic current transducer first and second coil all adopts the seven strands of enamel-cover twisted wires coiling that reduces eddy current.

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