CN202870144U - Current measuring device for breaker or switch cabinet - Google Patents
Current measuring device for breaker or switch cabinet Download PDFInfo
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- CN202870144U CN202870144U CN201220423014.0U CN201220423014U CN202870144U CN 202870144 U CN202870144 U CN 202870144U CN 201220423014 U CN201220423014 U CN 201220423014U CN 202870144 U CN202870144 U CN 202870144U
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- measuring device
- current measuring
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Abstract
The present utility model discloses a current measuring device for a breaker or a switch cabinet. The device comprises a current transformer device, a primary conductor, an insulation layer and a shielding layer, the current transformer device comprises an insulation support, a current transformer and an open circuit fault protection device arranged on the insulation support, the insulation support is provided with a central through hole, he current transformer is embedded inside the insulation support and used for enclosing the central through hole. The primary conductor is penetrated through the central through hole of the insulation support. The insulation layer is surrounded around the primary conductor. The shielding layer is surrounded between the insulation layer and the inner wall of the central through hole. The device has the following advantages, the current measuring device is compact in structure and small in volume, the device can be arranged on a primary conductor of a switch cabinet or a breaker, switch equipment miniaturization can be realized; the current measuring precision of the current measuring device is high, and problems that low voltage signals are adopted in the prior electronic current sensor, electromagnetic compatibility is not good, and the sensor is easily interfered.
Description
Technical field
The utility model relates to a kind of current measuring device for isolating switch or switch cubicle.
Background technology
Intelligent grid has become the developing direction of current electric system, smart machine is the node of intelligent grid and indispensable part, also being one of important symbol of distinguishing digital transformer substation and intelligent substation, is the basis of realizing smart machine and measure digitizing (such as parameters such as electric current, voltages).
The current measuring device of medium voltage switchgear equipment mainly contains two types at present: a kind of is traditional electromagnetic current transducer; Another kind is electronic current mutual inductor, and electronic type current sensor is divided into again Luo-coil sensor and small-signal current sensor.
Traditional electromagnetic current transducer exists volume large, Heavy Weight, exist magnetic saturation, coil not to allow open circuit (behind the open coil can produce high voltage) and need the shortcoming such as secondary conversion, it is not that intelligent substation is realized the digitized preferred and advanced scheme of measurement.Electronic type current sensor exists electromagnetism not good owing to its transmission is low voltage signal, and the problem that easily is disturbed can cause the transforming plant protecting misoperation, causes without accidents such as scheduled outages, has larger unreliability.
The utility model content
The utility model provides the current measuring device that is used for isolating switch or switch cubicle, and it has overcome the existing deficiency of current measuring device that is used for isolating switch or switch cubicle in the background technology.
The technical scheme that adopts that the utility model solves its technical matters is:
Be used for the current measuring device of isolating switch or switch cubicle, comprise:
A current transformer device comprises an insulated leg, a current transformer and an open fault protective device that is installed in insulated leg, and this insulated leg is established central through hole, and this current transformer is embedded in insulated leg and surrounds central through hole;
A Primary Conductor runs through the central through hole that passes insulated leg;
An insulation course is looped around outside the Primary Conductor; And
A screen layer is around being located between insulation course and central through hole inwall.
Among one preferred embodiment: this current transformer has the iron core of high permeability and is wound on secondary coil on this iron core.
Among one preferred embodiment: this secondary coil current output value is 0.05～0.3A.
Among one preferred embodiment: the secondary coil of this current transformer has exit, and this open fault protective device is connected in parallel on the exit of the secondary coil of current transformer.
Among one preferred embodiment: this screen layer is connected with a continuous earthy wire.
Among one preferred embodiment: this Primary Conductor and screen layer are cured as one by insulation course.
Among one preferred embodiment: this screen layer and central through hole axially flush and axial length is d1, this insulation course axial length is d2, this d2 is greater than d1.
Among one preferred embodiment: this insulated leg is established the wound hole around central through hole, and this current transformer is located at wound hole.
The technical program is compared with background technology, and it has following advantage:
1, the compact conformation of current measuring device, volume is little, can be installed on the Primary Conductor of switch cubicle or isolating switch, is conducive to the switchgear miniaturization; The current measurement precision of current measuring device is high, and it is not good to have solved the electromagnetic compatibility that present electronic type current sensor adopts low voltage signal to exist, and the problem such as easily is disturbed; Air by between screen layer shielding Primary Conductor and current transformer makes Electric Field Distribution even, avoids electric field to concentrate and the puncture insulating medium.
2, establish the open fault protective device, when open fault appearred in the secondary coil of D.C mutual-inductor, the conducting of open fault protective device can not produce at the breakpoint place high voltage, and after secondary coil was connected, the open fault protective device can recover its state automatically.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 has illustrated the schematic perspective view of the current measuring device of a preferred embodiment.
The master that Fig. 2 has illustrated the current measuring device of a preferred embodiment looks synoptic diagram.
Fig. 3 has illustrated the B-B diagrammatic cross-section of Fig. 2.
Embodiment
Please refer to Fig. 1, Fig. 2 and Fig. 3, be used for the current measuring device of isolating switch or switch cubicle, it comprises a current transformer device, a Primary Conductor 10, an insulation course 20 and a screen layer 30.
This current transformer device comprises an insulated leg 40, a current transformer 50 and an open fault protective device 60 that is installed in insulated leg 40, and this insulated leg 40 is established a central through hole 41 and around the wound hole 42 of central through hole 41.This current transformer 50 is embedded in the wound hole 42 of insulated leg 40 and surrounds central through hole 61.Present embodiment bearing, this current transformer 50 have the iron core of high permeability and are wound on secondary coil on this iron core, and this secondary coil current output value is 0.05～0.3A; The secondary coil of this current transformer 50 has exit; this open fault protective device 60 is connected in parallel on the exit of the secondary coil of current transformer 50, be used for to suppress the rising of the secondary coil voltage that causes when the secondary coil generation open circuit of mutual inductor or disconnection fault.Among the present embodiment, this open fault protective device 60 is existing parts.
This Primary Conductor 10 runs through the central through hole 41 that passes insulated leg 40.This insulation course 20 is looped around outside the Primary Conductor 10.This screen layer 30 is around being located between insulation course 20 and central through hole 41 inwalls.Among the present embodiment: this Primary Conductor 10 is cured as one with screen layer 30 by insulation course 20.
Among the present embodiment: this screen layer 30 is connected with a continuous earthy wire, so that screen layer 30 and earth potential are idiostatic.
Among the present embodiment: the material of this insulation course 20, insulated leg 40 is such as selecting epoxy resin etc.
Among the present embodiment, this screen layer and central through hole axially flush and axial length is d1, this insulation course axial length is d2, this d2 is greater than d1.
As required, also shielding laminating or one can be fixed in the central through hole inwall of insulated leg.
The current measuring device of present embodiment, the volume with electronic sensor is little, and is lightweight and be easy to the advantage such as digitizing, also solved simultaneously the problems such as electromagnetic compatibility of electronic type current sensor, is the preferential selection of measuring and protection in the intelligent substation.
The above, it only is the utility model preferred embodiment, so can not limit according to this scope that the utility model is implemented, the equivalence of namely doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model contains.
Claims (7)
1. be used for the current measuring device of isolating switch or switch cubicle, it is characterized in that: comprising:
A current transformer device comprises an insulated leg, a current transformer and an open fault protective device that is installed in insulated leg, and this insulated leg is established central through hole, and this current transformer is embedded in insulated leg and surrounds central through hole;
A Primary Conductor runs through the central through hole that passes insulated leg;
An insulation course is looped around outside the Primary Conductor; And
A screen layer is around being located between insulation course and central through hole inwall.
2. the current measuring device for isolating switch or switch cubicle according to claim 1 is characterized in that: this current transformer has the iron core of high permeability and is wound on secondary coil on this iron core.
3. the current measuring device for isolating switch or switch cubicle according to claim 2, it is characterized in that: this secondary coil current output value is 0.05～0.3A.
4. the current measuring device for isolating switch or switch cubicle according to claim 2, it is characterized in that: the secondary coil of this current transformer has exit, and this open fault protective device is connected in parallel on the exit of the secondary coil of current transformer.
5. the current measuring device for isolating switch or switch cubicle according to claim 2 is characterized in that: this screen layer is connected with earthy wire that links to each other.
6. each described current measuring device for isolating switch or switch cubicle in 5 according to claim 1, it is characterized in that: this Primary Conductor and screen layer are cured as one by insulation course.
7. each described current measuring device for isolating switch or switch cubicle in 5 according to claim 1 is characterized in that: this screen layer and central through hole axially flush and axial length is d1, this insulation course axial length is d2, this d2 is greater than d1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220423014.0U CN202870144U (en) | 2012-08-23 | 2012-08-23 | Current measuring device for breaker or switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220423014.0U CN202870144U (en) | 2012-08-23 | 2012-08-23 | Current measuring device for breaker or switch cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202870144U true CN202870144U (en) | 2013-04-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220423014.0U Expired - Lifetime CN202870144U (en) | 2012-08-23 | 2012-08-23 | Current measuring device for breaker or switch cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202870144U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950476A (en) * | 2017-03-31 | 2017-07-14 | 北京腾锐视讯科技有限公司 | A kind of fault electric arc detection sensor of some face installation parallel with detected wire |
| CN109273227A (en) * | 2018-08-27 | 2019-01-25 | 河南平高通用电气有限公司 | Cast-type mutual inductor |
-
2012
- 2012-08-23 CN CN201220423014.0U patent/CN202870144U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950476A (en) * | 2017-03-31 | 2017-07-14 | 北京腾锐视讯科技有限公司 | A kind of fault electric arc detection sensor of some face installation parallel with detected wire |
| CN109273227A (en) * | 2018-08-27 | 2019-01-25 | 河南平高通用电气有限公司 | Cast-type mutual inductor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |
|
| CX01 | Expiry of patent term |