CN206697341U - Pole-mounted circuit breaker Combined type current transformer - Google Patents

Abstract

It the utility model is related to current transformer high-voltage electrical apparatus and manufacture and design field, particularly a kind of pole-mounted circuit breaker Combined type current transformer, the Combined type current transformer is independent zero sequence current mutual inductor, or integral type or split type combination for zero sequence current mutual inductor and single-phase current transformer, it is installed in three metal conductive bars of pole-mounted circuit breaker；Each current transformer includes mutual inductor coil and secondary high-temperature lead, surrounding fill insulant, and insulating materials outside is provided with full skirt；Lower end is connected with fairlead, and secondary high-temperature wire is drawn through fairlead；The through hole passed through for metal conductive bar is provided among the iron core of mutual inductor coil, the conductive metal pipe with the metal conductive bar and insulating materials close contact is provided with the inside of through hole.The utility model reduces the shelf depreciation of Combined type current transformer, improves stability and the life-span of product quality and operation by increasing conductive metal pipe.It is and simple in construction, easy to use.

Description

Pole-mounted circuit breaker Combined type current transformer

Technical field

It the utility model is related to current transformer high-voltage electrical apparatus and manufacture and design field, more particularly to a kind of pole-mounted circuit breaker group Box-like current transformer.

Background technology

Current transformer is that electric current, the equipment of relay protection are measured in power system, at present on-pole switch, particularly open air High-pressure vacuum breaker（Also known as：Standard type vacuum switch）, current transformer generally is installed on primary conductive bar.Existing peace Current transformer generally use poured with epoxy resin or silicon rubber pressure injection on primary conductive bar form, and both do not allow Easily meet the requirement in national standard to pole-mounted circuit breaker current transformer partial discharge quantity.Pole-mounted circuit breaker current transformer is being tested In can not meet Standard, in practice partial discharge quantity be likely to be breached hundreds of even thousands of pC.In power system, often because mutually The partial discharge quantity of sensor is too high, and influences life-span and the long-time stability of current transformer, it will the safety belt to power network comes Great potential safety hazard.

Utility model content

Deficiency, pole-mounted circuit breaker Combined type current transformer provided by the utility model, is efficiently solved for more than The problem of pole-mounted circuit breaker current transformer is local high-volume too high.

The technical solution of the utility model is：

A kind of pole-mounted circuit breaker Combined type current transformer, including pole-mounted circuit breaker and Combined type current transformer, it is described Pole-mounted circuit breaker includes three metal conductive bars of three phase mains, and the Combined type current transformer is that one group of zero-sequence current is mutual Sense, is installed in three metal conductive bars, the zero sequence current mutual inductor includes the mutual inductor coil and secondary high-temperature of Long Circle Lead, intermetallic metal contact rod lower section are connected with a fairlead, and the secondary high-temperature wire is drawn through fairlead；The mutual inductance Three through holes passed through for three metal conductive bars, the mutual inductor coil and secondary high-temperature are provided among the iron core of device coil Lead surrounding fill insulant, the insulating materials outside are provided with full skirt；Characterized in that, set on the inside of each through hole It is equipped with the conductive metal pipe with the metal conductive bar and insulating materials close contact.

A kind of pole-mounted circuit breaker Combined type current transformer, including pole-mounted circuit breaker and Combined type current transformer, it is described Pole-mounted circuit breaker includes three metal conductive bars of three phase mains, and the Combined type current transformer is one group of zero sequence current mutual inductance The integrated combination of device and three groups of single phasing protection current transformers, each perform independent function；The zero sequence current mutual inductor Mutual inductor coil and secondary high-temperature lead including Long Circle, the single phasing protection current transformer include circular transformer line Circle and secondary high-temperature lead；The mutual inductor coil of three single phasing protection current transformers is overlapping and equidistantly distributes in zero sequence The same side of the mutual inductor coil of current transformer, the integral type mutual inductor coil of Combined type current transformer is formed, and together It is installed in three metal conductive bars；The Combined type current transformer lower end is connected with three fairleads, and described three groups single-phase The secondary high-temperature wire of protective current transformer be each passed through corresponding to fairlead draw, the zero sequence current mutual inductor it is secondary High temperature wire is drawn from middle fairlead；The transformer line of the zero sequence current mutual inductor and three single phasing protection current transformers Three through holes passed through for three metal conductive bars, the integral type mutual inductor coil and secondary height are provided among the iron core of circle Warm lead surrounding fill insulant, the insulating materials outside are provided with full skirt；Characterized in that, on the inside of each through hole It is provided with the conductive metal pipe with the metal conductive bar and insulating materials close contact.

A kind of pole-mounted circuit breaker Combined type current transformer, including pole-mounted circuit breaker and Combined type current transformer, it is described Pole-mounted circuit breaker includes three metal conductive bars of three phase mains, and the Combined type current transformer is one group of zero sequence current mutual inductance The split type combination of device and three groups of single phasing protection current transformers, each performs independent function；The zero sequence current mutual inductor Be absolute construction with each single phasing protection current transformer, three single phasing protection current transformers it is overlapping and equidistantly distribute in The same side of zero sequence current mutual inductor, and be installed on together in three metal conductive bars；The zero sequence current mutual inductor includes length Circular mutual inductor coil and secondary high-temperature lead, each single phasing protection current transformer include circular mutual inductor coil With secondary high-temperature lead, each current transformer lower end is connected with a fairlead respectively, and secondary high-temperature lead is each passed through Corresponding fairlead is drawn；The iron core of the mutual inductor coil of the zero sequence current mutual inductor and three single phasing protection current transformers Centre is provided with three through holes passed through for three metal conductive bars, the mutual inductor coil of each current transformer and secondary High temperature lead surrounding fill insulant, the insulating materials outside are provided with full skirt；Characterized in that, in each through hole Side is provided with the conductive metal pipe with the metal conductive bar and insulating materials close contact.

The rounded tubulose of the conductive metal pipe or Long Circle tubulose.

The conducting metal tube thickness is 0.5-5 millimeters, preferably 1 millimeter.

The conducting metal bore and metal conductive bar major diameter fit tolerance are 0-6 millimeters, preferably 2 millimeters.

The conductive metal pipe material is that stainless steel, copper, aluminium, aluminium alloy, iron or silver any of are worked as, the fairlead For stainless steel tube.

The insulating materials is electrically insulating silicone rubber, and the conductive metal pipe passes through vulcanization or liquid dielectric under mould high temperature Silica gel is bonded, and is combined together with the electrically insulating silicone rubber.

The insulating materials is epoxy resin, and the conductive metal pipe is bonded by liquid dielectric silica gel, with the epoxy Resin combines together.

The technical solution of the utility model is by setting and metal conductive bar on the inside of the through hole of transformer iron core and absolutely The conductive metal pipe of edge material tight contact, has been filled up between metal conductive bar and the insulating materials of Combined type current transformer Space, electric field local distortion will not be made and produce point discharge, meet Combined type current transformer entirety local discharging level National standard, product quality is improved, improve the stability of Operation of Electric Systems.

Brief description of the drawings

Fig. 1 is one group of zero sequence current mutual inductor front view of the utility model；

Fig. 2 is Fig. 1 along line A-A schematic cross-section；

Fig. 3 is Fig. 1 edges and paper parallel direction schematic cross-section；

Fig. 4 is that one group of zero sequence of the utility model adds three groups of single-phase integral type current transformer front views；

Fig. 5 is Fig. 4 along line B-B schematic cross-section；

Fig. 6 is that one group of zero sequence of the utility model adds three groups of single-phase Split type current transformer schematic cross-sections.

Embodiment

Design, concrete structure and caused technique effect of the present utility model are made furtherly below with reference to accompanying drawing It is bright, to be fully understood from the purpose of this utility model, feature and effect.

Fig. 1, Fig. 2 and Fig. 3 are the embodiment one of pole-mounted circuit breaker Combined type current transformer of the present utility model, and electric current is mutual Sensor is independent one group of zero sequence current mutual inductor；Fig. 4 and Fig. 5 is embodiment two of the present utility model, and current transformer is one group The integral structure of zero sequence current mutual inductor and three groups of single phasing protection current transformers；Fig. 6 is embodiment three of the present utility model, Current transformer is the split-type structural of one group of zero sequence current mutual inductor and three groups of single phasing protection current transformers.

Embodiment one, with reference to figure 1, Fig. 2 and Fig. 3, Combined type current transformer is independent zero sequence current mutual inductor 201, zero Sequence current transformer top is provided with mutual inductor coil 21 and secondary high-temperature wire 22, and mutual inductor coil 21 is a long annular Coil, three metal conductive bars pass simultaneously from long making toroidal coil.Transformer be located at the lower end of intermetallic metal contact rod with Stainless steel tube 26 is connected；Secondary high-temperature wire 22 is drawn through stainless steel tube 26；Mutual inductor coil 21 and secondary high-temperature lead 22 Surrounding fills electrically insulating silicone rubber 24, and the outside of electrically insulating silicone rubber 24 is provided with full skirt；It is provided among the iron core of mutual inductor coil 21 and supplies three Three through holes 1 that root metal conductive bar passes through, each inner side of through hole 1 are provided with and metal conductive bar and electrically insulating silicone rubber 24 The conductive aluminum pipe 25 of close contact, conductive aluminum pipe 25 are in Long Circle tubulose, and thickness is 1 millimeter.

Embodiment is：

Transformer iron core wraps up enamel-covered wire with insulating cloth tape and simplex winding turns into mutual inductor coil 21, by transformer device coil 21 are put in the mould of transformer making；Secondary high-temperature lead 22 is through the hole of stainless steel tube 26 and draws；In mutual inductor coil 21 Electrically insulating silicone rubber is filled up with the surrounding of secondary high-temperature lead 22；Starting mould allows above-mentioned device in die cavity through high temperature vulcanized, process A period of time sulfidization molding is current transformer product；Conductive aluminum pipe 25 is put into die cavity together with other devices through too high in advance Warm sulfidization molding, combined together with the electrically insulating silicone rubber of current transformer.

Metal conductive bar overall diameter is 20mm, in order that conductive aluminum pipe 25 is in close contact with electrically insulating silicone rubber 24, avoids producing Raw space, the internal diameter design size of conductive aluminum pipe 25 are（22×37）Millimeter.

By arrangement above, conductive aluminum pipe 25 is filled with electrically insulating silicone rubber and the metal conductive bar junction of current transformer The space at position, both is realized that uniform close contacts, electric field local distortion will not be made and produce point discharge.Shelf depreciation refers to Mark is improved significantly, and can be less than 20pC, so as to significantly improve pole-mounted circuit breaker Combined type current transformer service life and Security.

Embodiment two, with reference to figure 4 and Fig. 5, Combined type current transformer is one group of zero sequence current mutual inductor 201 and three groups of lists The integral composite structure of phase protective current transformer 202, but each perform independent function.Transformer top is provided with one Formula mutual inductor coil 203 and secondary high-temperature wire 22.Integral type mutual inductor coil 203 is the mutual inductance of zero sequence current mutual inductor 201 The combination of the mutual inductor coil 21 of device coil 21 and single phasing protection current transformer 202, the coil of zero sequence current mutual inductor 201 are One big long making toroidal coil, protective current transformer 202 are three protective current mutual inductances on A, B, C three-phase of high pressure Device, the coil of protective current transformer 202 is three less circular coils, overlapping and equidistantly distribute in long making toroidal coil The same side, form integral type mutual inductor coil 203；Integral type mutual inductor coil 203 and the filling of the surrounding of secondary high-temperature lead 22 Epoxy resin 24, the outside of epoxy resin 24 are provided with full skirt；

Three passed through for three metal conductive bars are provided among the iron core of the mutual inductor coil 21 of zero sequence current mutual inductor 201 Individual through hole 1, three metal conductive bars pass simultaneously from long making toroidal coil, three single phasing protection current transformers 202 it is mutual The through hole 1 passed through for relevant position metal conductive bar, the metallic conduction of relevant position are provided among the iron core of sensor coil 21 Rod is passed from small hub of a spool simultaneously, and each inner side of through hole 1 is provided with to be in close contact with metal conductive bar and epoxy resin 24 Conductive stainless steel tube 25, conductive 25 rounded tubulose of stainless steel tube, thickness be 1 millimeter.

Combined type current transformer lower end is connected with three fairleads 26, and the two of three groups of single phasing protection current transformers 202 The fairlead 26 that secondary high temperature wire 22 is each passed through correspondence position is drawn, the secondary high-temperature wire 22 of zero sequence current mutual inductor 201 Drawn from middle fairlead 26；

Embodiment is：

The transformer iron core of zero sequence current mutual inductor and three protective current transformers wraps up enamel-cover with insulating cloth tape respectively Line and winding turn into mutual inductor coil, then are combined by bonding or pressure injection, the coil point of three protective current transformers Set and in long making toroidal coil the same side, be put in the mould of transformer making；Transformer secondary high-temperature lead 22 from it is each mutually Sensor coil is drawn respectively, is drawn through stainless steel tube 26 corresponding to lower end, the secondary high-temperature lead 22 of zero sequence current mutual inductor Drawn from the stainless steel tube 26 of centre；Epoxy resin is filled up in integral type mutual inductor coil 21 and the surrounding of secondary high-temperature lead 22； Starting mould allows above-mentioned device to be poured into a mould in die cavity through high temperature, is current transformer product through curing molding after a while；Three Individual conductive stainless steel tube 25 is bonded finally by liquid dielectric silica gel, is combined together with the epoxy resin of current transformer.

The a diameter of 20mm of metal conductive bar, in order that conductive stainless steel tube 25 is in close contact with epoxy resin 24, avoid producing Raw space, the internal diameter of conductive stainless steel tube 25 are designed as 23 millimeters.

By arrangement above, conductive stainless steel tube 25 is filled with the epoxy resin and metallic conduction of integral type current transformer The space at rod junction position, both is realized that uniform close contacts, electric field local distortion will not be made and produce point discharge.Office Portion's electric discharge index is improved significantly, and can be less than 20pC, make so as to significantly improve pole-mounted circuit breaker Combined type current transformer With life-span and security.

Embodiment three, with reference to figure 6, Combined type current transformer is two on one group of zero sequence current mutual inductor 201 and A, C phase The split combination structure of group single phasing protection current transformer 202, each performs independent function.Three current transformers are Absolute construction, by being combined into split-type structural, two single phasing protection electric current shield sensors 202 are separately placed in zero-sequence current shield sense The same side both ends of device 201, the coil of zero sequence current mutual inductor 201 is a long making toroidal coil, and single phasing protection electric current shield is felt The coil of device 202 is two less circular coils.

Three passed through for three metal conductive bars are provided among the iron core of the long making toroidal coil of zero sequence current mutual inductor 201 Individual through hole 1, three metal conductive bars pass from coil simultaneously, the smaller round coil of the single phasing protection electric current shield sensor at both ends Iron core among be provided with the through hole 1 passed through for relevant position metal conductive bar, the metal conductive bar of both sides is respectively from corresponding position The small hub of a spool put while pass.Each inner side of through hole 1 is provided with tight with the metal conductive bar and electrically insulating silicone rubber 24 The tactile contact tube 25 of contiguity.Contact tube 25 is in Long Circle tubulose, and thickness is 1 millimeter.

The mutual inductor coil 21 and the surrounding of secondary high-temperature lead 22 filling electrically insulating silicone rubber 24 of each current transformer, it is described The outside of electrically insulating silicone rubber 24 is provided with full skirt；Lower end is connected with respective fairlead 26 respectively, and secondary high-temperature lead 22, which passes through, draws Pipe 26 is drawn；

The a diameter of 20mm of metal conductive bar, in order that contact tube 25 is in close contact with electrically insulating silicone rubber 24, avoid producing Space, the internal diameter of contact tube 25 are designed as（22×37）Millimeter.

By arrangement above, the electrically insulating silicone rubber that contact tube 25 is filled with multiple independent current transformers is led with metal The space at torch junction position, both is realized that uniform close contacts, electric field local distortion will not be made and produce point discharge. Shelf depreciation index is improved significantly, and can be less than 20pC, so as to significantly improve pole-mounted circuit breaker Combined type current transformer Service life and security.

Compared with prior art, the utility model is simple in construction, easy to use, by increasing conductive metal pipe, makes combination Formula current transformer entirety local discharging level meets national standard, improves product quality, improves pole-mounted circuit breaker combined electrical The stability of current transformer operation and life-span.

Disclosed above is only embodiment of the present utility model, and still, the utility model is not limited to this, any ability What the technical staff in domain can think change should all fall into the scope of protection of the utility model.

Claims (10)

1. a kind of pole-mounted circuit breaker Combined type current transformer, including pole-mounted circuit breaker and Combined type current transformer, the post Upper breaker includes three metal conductive bars of three phase mains, and the Combined type current transformer is one group of zero sequence current mutual inductor （201）, including mutual inductor coil（21）With secondary high-temperature lead（22）, the mutual inductor coil（21）Iron core among be provided with supply Three through holes that three metal conductive bars pass through（1）, zero sequence current mutual inductor（201）Pass through through hole（1）It is installed on three In metal conductive bar；The mutual inductor coil（21）With secondary high-temperature lead（22）Surrounding fill insulant（24）, it is described exhausted Edge material（24）Outside is provided with full skirt；The zero sequence current mutual inductor（201）Drawn below intermetallic metal contact rod with one Pipe（26）It is connected, the secondary high-temperature lead（22）Through fairlead（26）Draw；Characterized in that, each through hole （1）Inner side is provided with and the metal conductive bar and insulating materials（24）The conductive metal pipe of close contact（25）.

2. a kind of pole-mounted circuit breaker Combined type current transformer, including pole-mounted circuit breaker and Combined type current transformer, the post Upper breaker includes three metal conductive bars of three phase mains, and the Combined type current transformer is one group of zero sequence current mutual inductor （201）With two/tri- single phasing protection current transformers（202）Integrated combination, each perform independent function；Every group of electric current Transformer includes mutual inductor coil（21）With secondary high-temperature lead（22）, zero sequence current mutual inductor（201）Mutual inductor coil （21）With two/tri- single phasing protection current transformers（202）Mutual inductor coil（21）Overlapping combinations together, form integral type Mutual inductor coil（203）, the integral type mutual inductor coil（203）Iron core among be provided with and passed through for three metal conductive bars Three through holes（1）, and pass through through hole together（1）It is installed in three metal conductive bars；The integral type mutual inductor coil （203）With secondary high-temperature lead（22）Surrounding fill insulant（24）, the insulating materials（24）Outside is provided with full skirt；It is described Combined type current transformer is positioned at three metal conductive bars lower sections and three fairleads（26）It is connected, two/tri- single-phase guarantors Protect current transformer（202）Secondary high-temperature lead（22）It is each passed through corresponding fairlead（26）Draw, the zero-sequence current Transformer（201）Secondary high-temperature lead（22）From middle fairlead（26）Draw；Characterized in that, each through hole （1）Inner side is provided with and the metal conductive bar and insulating materials（24）The conductive metal pipe of close contact（25）.

3. a kind of pole-mounted circuit breaker Combined type current transformer, including pole-mounted circuit breaker and Combined type current transformer, the post Upper breaker includes three metal conductive bars of three phase mains, and the Combined type current transformer is one group of zero sequence current mutual inductor （201）With two/tri- groups of single phasing protection current transformers（202）Split type combination, each perform independent function；Described every group Current transformer（202）It is absolute construction, including mutual inductor coil（21）With secondary high-temperature lead（22）, lower end respectively with respectively From fairlead（26）It is connected, secondary high-temperature lead（22）Through fairlead（26）Draw；The mutual inductor coil（21）With it is secondary High temperature lead（22）Surrounding fill insulant（24）, the insulating materials（24）Outside is provided with full skirt；The monophase current is mutual Sensor（202）Mutual inductor coil（21）Iron core among be provided with the through hole that passes through of metal conductive bar for relevant position（1）, The zero sequence current mutual inductor（201）Mutual inductor coil（21）Iron core among be provided with for three metal conductive bars pass through three Individual through hole（1）, all current transformers pass through through hole together（1）It is installed in three metal conductive bars；Characterized in that, Each through hole（1）Inner side is provided with and the metal conductive bar and insulating materials（24）The conductive metal pipe of close contact （25）.

4. the pole-mounted circuit breaker Combined type current transformer as described in claim 1 or 2 or 3, it is characterised in that the conductive gold Category pipe（25）Rounded tubulose or Long Circle tubulose, the conductive metal pipe（25）Thickness is 0.5-5 millimeters.

5. pole-mounted circuit breaker Combined type current transformer as claimed in claim 4, it is characterised in that the conductive metal pipe （25）Thickness is 1 millimeter.

6. the pole-mounted circuit breaker Combined type current transformer as described in claim 1 or 2 or 3, it is characterised in that the conductive gold Category pipe（25）Internal diameter and metal conductive bar major diameter fit tolerance are 0-6 millimeters.

7. pole-mounted circuit breaker single-phase current transformer as claimed in claim 6, it is characterised in that the conductive metal pipe（25） Internal diameter is 2 millimeters with metal conductive bar major diameter fit tolerance.

8. the pole-mounted circuit breaker Combined type current transformer as described in claim 1 or 2 or 3, it is characterised in that the conductive gold Category pipe（25）Material is that stainless steel, copper, aluminium, aluminium alloy, iron or silver any of are worked as, the fairlead（26）For stainless steel Pipe.

9. the pole-mounted circuit breaker Combined type current transformer as described in claim 1 or 2 or 3, it is characterised in that the insulation material Material（24）For electrically insulating silicone rubber, the conductive metal pipe（25）It is bonded by vulcanization under mould high temperature or liquid dielectric silica gel, Combined together with the electrically insulating silicone rubber.

10. the pole-mounted circuit breaker Combined type current transformer as described in claim 1 or 2 or 3, it is characterised in that the insulation Material（24）For epoxy resin, the conductive metal pipe（25）Be bonded by liquid dielectric silica gel, with the epoxy resin melt for One.