CN208753137U - A kind of ZW32 switch uses electronic current mutual inductor - Google Patents

Abstract

The utility model embodiment provides a kind of ZW32 switch electronic current mutual inductor, it include: external insulation shell, interior insulation body, three phase sequences, which are surveyed, protects integrated iron core, one zero sequence, which is surveyed, protects integrated iron core, three phase sequence secondary windings, one zero sequence secondary winding and current-to-voltage convertor, secondary winding is uniformly wound on the iron core of corresponding function, both ends are connect with current-to-voltage convertor, two sub-cells are formed to be placed in external insulation shell, it is interior insulation body between external insulation shell and two sub-cells, there are a conducting wire cable-through holes for external insulation casing center position, conducting wire cable-through hole switchs the design of primary conductive bar outer diameter according to ZW32, ZW32 switch is sleeved on outside ZW32 switch primary conductive bar with electronic current mutual inductor.ZW32 provided by the embodiment of the utility model is switched with electronic current mutual inductor high reliablity, highly-safe, measurement range is big, at low cost, small in size, the linearity is good, precision is high, while providing phase sequence, zero sequence measurement and protection signal.

Description

A kind of ZW32 switch uses electronic current mutual inductor

Technical field

The utility model embodiment is related to the electrical detection technique field of electric system, and specially a kind of ZW32 switch uses electronics Formula current transformer.

Background technique

With the construction of smart grid, ZW32 switch as distribution segmentation, branch, boundary, contact important equipment, need Have the function of that the feeder automation on the spot of Adaptive synthesis type, short circuit/Earth Fault Detection realize that singlephase earth fault selects on the spot Line, section position and are isolated, and cooperation substation's outlet switch once closes a floodgate and the secondary combined floodgate of outlet switch, to guarantee above equipment Electric property is reliable and stable, provides current measurement, protects the current transformer of signal that should fully demonstrate " low-loss, energy-saving ring The characteristics of guarantor, efficient, economic, stable and reliable for performance and miniaturization " and demand.Currently, ZW32 switch is mainly using traditional electromagnetism Formula current transformer, although conventional electromagnetic current transformer can satisfy the need run at present by longtime running practical proof It wants, but as electric network composition is increasingly sophisticated, power system capacity is continuously increased, system short-circuit electric current is increasing, information-based, automation The drawbacks of level is higher and higher, conventional electromagnetic current transformer is more and more obvious.

Drawback of the conventional electromagnetic current transformer in ZW32 switch application is mainly reflected in the following aspects: existing Magnetic saturation phenomenon, conventional electromagnetic current transformer is when short circuit occurs for system in operation, under powerful short circuit current effect, Mutual inductor iron core will retain larger remanent magnetism, and iron core saturation is serious, make transformer transient penalty, not can correctly reflect primary electricity Stream, causes relay fail or malfunction；Frequency response range is narrow, poor linearity, and anti-interference ability is weak；Range of dynamic measurement is narrow, difficult To realize large-range measuring；Volume is big, weight is heavy, own loss is high；It is connected with relay protection, instrument and meter for automation and needs by secondary turn It changes, deposits matching problem between the devices；Resource-type material utilization amount is big, less economical；Secondary winding in current transformer open circuit can produce Raw high voltage, causes equipment or personal injury.

Utility model content

To solve existing for existing ZW32 switch electromagnetic current transducer, reliability is low, safety is low, measurement range The problems such as small, less economical, the utility model embodiment provide a kind of ZW32 switch electronic current mutual inductor.

The utility model embodiment provides a kind of ZW32 switch electronic current mutual inductor, comprising: external insulation shell, interior Insulator, three phase sequences are surveyed and protect integrated iron core, a zero sequence is surveyed and protects integrated iron core, three phase sequence secondary windings, a zero sequence two Secondary winding and current-to-voltage convertor, secondary winding are uniformly wound on the iron core of corresponding function, around make it is described it is secondary around Group both ends are connect with the current-to-voltage convertor, form two sub-cells, and two sub-cell is placed on the external insulation shell It is interior, be the interior insulation body between the external insulation shell and two sub-cell, external insulation casing center position there are Conducting wire cable-through hole, a conducting wire cable-through hole switch primary conductive bar outer diameter according to ZW32 and design, and ZW32 switchs electricity consumption Type current transformer is sleeved on outside the ZW32 switch primary conductive bar.

Further, it is annular that the phase sequence, which is surveyed and protects the shape of integrated iron core, and the zero sequence surveys the shape for protecting integrated iron core For racetrack.

Further, the material of the external insulation shell uses silicon rubber.

Further, the silicon rubber is heat vulcanized silicone rubber, and the heat vulcanized silicone rubber includes dimethyl silicone rubber, first The dilute base silicon rubber of base second, the dilute base phenyl siloxane rubber of methyl second or the dilute base trifluoro propyl silicon rubber of methyl second.

Further, the interior insulation body between the external insulation shell and two sub-cell by using liquid silicon Rubber vacuum encapsulating is formed.

Further, the liquid silastic includes addition vulcanization type silicon rubber.

Further, the phase sequence surveys the integrated iron core of guarantor and the zero sequence surveys the material for protecting integrated iron core using amorphous alloy Or permalloy.

Further, a conducting wire cable-through hole is provided with shielding grading ring, and the shielding grading ring sets fusion and exists The material of the inner wall of conducting wire cable-through hole, the shielding grading ring is conductor or semiconductor.

Further, the shielding grading ring is made using conductive rubber, copper mesh or aluminium net.

Further, the secondary wiring exit of the external insulation shell has outwardly extending insulation tower group, described exhausted Edge tower group is inserted with telescopic secondary wiring conduit.

ZW32 switch provided by the embodiment of the utility model has high reliablity, safety with electronic current mutual inductor High, the features such as measurement range is big, economy is high, small in size, light-weight, the linearity is good, precision is high, phase sequence, zero can be provided simultaneously Sequence measurement and protection signal.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is this Some embodiments of utility model, for those of ordinary skill in the art, without creative efforts, also Other drawings may be obtained according to these drawings without any creative labor.

Fig. 1 is the facing structure signal of ZW32 switch electronic current mutual inductor provided by the embodiment of the utility model Figure；

Fig. 2 is that the plan structure of ZW32 provided by the embodiment of the utility model switch electronic current mutual inductor is illustrated Figure；

Fig. 3 is the A-A schematic cross-sectional view in Fig. 1；

1- external insulation shell；2- phase sequence secondary winding；3- phase sequence, which is surveyed, protects integrated iron core；

4- zero sequence secondary winding；5- zero sequence, which is surveyed, protects integrated iron core；6- interior insulation body；

7- shields grading ring；8- current-to-voltage convertor；9- secondary wiring conduit.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical solutions in the embodiments of the present invention are clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to The range of the utility model protection.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower", The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of describing the present invention and simplifying the description, rather than indicate Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand For limitations of the present invention.

In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, on can understanding as the case may be State the concrete meaning of term in the present invention.

Fig. 1 is the facing structure signal of ZW32 switch electronic current mutual inductor provided by the embodiment of the utility model Figure；Fig. 2 is the overlooking structure diagram that ZW32 provided by the embodiment of the utility model switch uses electronic current mutual inductor；Fig. 3 For the A-A schematic cross-sectional view in Fig. 1.As shown in Figure 1, Figure 2, Figure 3 shows, ZW32 switch provided by the embodiment of the utility model is used Electronic current mutual inductor is made of LPCT low-power coil principle, including 6, three external insulation shell 1, interior insulation body phases Sequence, which is surveyed, protects the integrated zero sequence secondary winding 4 of phase sequence secondary winding 2, one of iron core 5, three of 3, zero sequences survey guarantors of integrated iron core and electricity Galvanic electricity pressure converter 8, secondary winding are uniformly wound on the iron core of corresponding function, around the secondary winding both ends made and institute The connection of current-to-voltage convertor 8 is stated, two sub-cells are formed, two sub-cell is placed in the external insulation shell 1, described outer It is the interior insulation body 6 between insulation shell 1 and two sub-cell, there are once lead for 1 center of external insulation shell Line cable-through hole, a conducting wire cable-through hole switch primary conductive bar outer diameter according to ZW32 and design, ZW32 switch electronic type electricity Current transformer is sleeved on outside the ZW32 switch primary conductive bar.

ZW32 switch provided by the embodiment of the utility model has high reliablity, safety with electronic current mutual inductor High, the features such as measurement range is big, economy is high, small in size, light-weight, the linearity is good, precision is high, phase sequence, zero can be provided simultaneously Sequence measurement and protection signal.

Further, based on the above embodiment, it is annular that the phase sequence, which is surveyed and protects the shape of integrated iron core 3, and the zero sequence is surveyed The shape for protecting integrated iron core 5 is racetrack.

Further, based on the above embodiment, the material of the external insulation shell 1 uses silicon rubber.Using silicon rubber system Make silicon rubber external insulation shell, technique production is simple, and insulation thickness is consistent, and it is stable and reliable for performance, shorten the production cycle, reduces energy Consumption, low-carbon environment-friendly.

Further, based on the above embodiment, the silicon rubber is heat vulcanized silicone rubber, and the heat vulcanized silicone rubber includes The dilute base silicon rubber of dimethyl silicone rubber, methyl second, the dilute base phenyl siloxane rubber of methyl second or the dilute base trifluoro propyl silicon rubber of methyl second.

Further, based on the above embodiment, the interior insulation body 6 passes through in the external insulation shell 1 and described secondary It is formed between unit using liquid silastic vacuum encapsulation.Encapsulating liquid silastic and the silicon rubber external insulation shell being fabricated to It is same type of material, it is not in air gap that the two compatibility is good, can effectively solve the problems, such as shelf depreciation.

Further, based on the above embodiment, the liquid silastic includes addition vulcanization type silicon rubber.

Further, based on the above embodiment, the phase sequence, which is surveyed, protects integrated iron core 3 and the integrated iron core 5 of zero sequence survey guarantor Material use amorphous alloy or permalloy.

Further, based on the above embodiment, a conducting wire cable-through hole is provided with shielding grading ring 7, the shielding Grading ring 7 sets fusion in the inner wall of a conducting wire cable-through hole, and the material of the shielding grading ring 7 is conductor or partly leads Body.

Further, based on the above embodiment, the shielding grading ring 7 using conductive rubber, copper mesh or aluminium net production and At.

Further, based on the above embodiment, the secondary wiring exit of the external insulation shell 1 has outwardly extending Insulation tower group prevents from discharging；The insulation tower group is inserted with telescopic secondary wiring conduit 9, convenient to draw to secondary wiring It leads, secondary wiring conduit is scalable, is adapted to the on-pole switch of different model.

ZW32 switch provided by the embodiment of the utility model is a kind of using LPCT low-power with electronic current mutual inductor Electronic current mutual inductor made of coil principle for ZW32 switch, with existing ZW32 switch made of electromagnetic type principle Current transformer is compared, and due to the material high using magnetic permeability, saturation magnetic induction, saturation multiple is high, and measurement dynamic range is big, can be with Measurement and protection signal is provided simultaneously for measurement, protective device；Secondary offer small voltage output, directly to electronic instrument, microcomputer Measuring and controlling equipment provides signal, saves intermediate conversion link, reduces composition error；Secondary winding connects shunt resistance, point in parallel Leakage resistance makes mutual inductor power loss close to zero by optimization design；According to ZW32 switch performance design feature, it is made three-phase It surveys and protects integral type, phase sequence, zero sequence measurement and protection signal can be provided simultaneously；Secondary winding connects shunt resistance, will not generate open Road high voltage, there is no open circuit hidden danger, do not need subsequent anti-open circuit measure processing；Secondary current is very small with induced potential, phase Reduce with core section under flux density, it is small in size, it is light-weight；Secondary winding directly provides voltage output, be conducive to Microcomputer Protection and Electric power digital, automation development；The measurement linearity is good, precision is high.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations； Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc. With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution The spirit and scope of scheme.

Claims (10)

1. a kind of ZW32 switch electronic current mutual inductor characterized by comprising external insulation shell, interior insulation body, three Phase sequence is surveyed and protects integrated iron core, a zero sequence is surveyed and protects integrated iron core, three phase sequence secondary windings, a zero sequence secondary winding and electric current Electric pressure converter, secondary winding are uniformly wound on the iron core of corresponding function, around the secondary winding both ends made with it is described Current-to-voltage convertor connection, forms two sub-cells, and two sub-cell is placed in the external insulation shell, the external insulation It is the interior insulation body between shell and two sub-cell, there are a conducting wires to cross line for external insulation casing center position Hole, a conducting wire cable-through hole switch primary conductive bar outer diameter according to ZW32 and design, ZW32 switch electronic current mutual inductance Device is sleeved on outside the ZW32 switch primary conductive bar.

2. ZW32 switch electronic current mutual inductor according to claim 1, which is characterized in that the phase sequence, which is surveyed, protects one The shape of body iron core is annular, and it is racetrack that the zero sequence, which is surveyed and protects the shape of integrated iron core,.

3. ZW32 switch electronic current mutual inductor according to claim 1, which is characterized in that the external insulation shell Material use silicon rubber.

4. ZW32 switch electronic current mutual inductor according to claim 3, which is characterized in that the silicon rubber is heat Sulphurated siliastic, the heat vulcanized silicone rubber include dimethyl silicone rubber, the dilute base silicon rubber of methyl second, the dilute base phenyl silicon of methyl second Rubber or the dilute base trifluoro propyl silicon rubber of methyl second.

5. ZW32 switch electronic current mutual inductor according to claim 3 or 4, which is characterized in that the interior insulation Body between the external insulation shell and two sub-cell by using liquid silastic vacuum encapsulation to be formed.

6. ZW32 switch electronic current mutual inductor according to claim 5, which is characterized in that the liquid silastic Including addition vulcanization type silicon rubber.

7. ZW32 switch electronic current mutual inductor according to claim 1, which is characterized in that the phase sequence, which is surveyed, protects one Body iron core and the zero sequence survey the material for protecting integrated iron core using amorphous alloy or permalloy.

8. ZW32 switch electronic current mutual inductor according to claim 1, which is characterized in that a conducting wire mistake String holes is provided with shielding grading ring, and the shielding grading ring sets fusion in the inner wall of a conducting wire cable-through hole, the screen The material for covering grading ring is conductor or semiconductor.

9. ZW32 switch electronic current mutual inductor according to claim 8, which is characterized in that the shielding grading ring It is made using conductive rubber, copper mesh or aluminium net.

10. ZW32 switch electronic current mutual inductor according to claim 1, which is characterized in that the external insulation shell The secondary wiring exit of body has outwardly extending insulation tower group, and the insulation tower group is inserted with telescopic secondary wiring and leads Pipe.