CN206388604U - A kind of current transformer with breakdown protection - Google Patents
A kind of current transformer with breakdown protection Download PDFInfo
- Publication number
- CN206388604U CN206388604U CN201621083352.9U CN201621083352U CN206388604U CN 206388604 U CN206388604 U CN 206388604U CN 201621083352 U CN201621083352 U CN 201621083352U CN 206388604 U CN206388604 U CN 206388604U
- Authority
- CN
- China
- Prior art keywords
- secondary coil
- protection screen
- current transformer
- cylindrical shape
- protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Transformers For Measuring Instruments (AREA)
Abstract
The utility model is related to a kind of current transformer with breakdown protection; including secondary coil and major insulation body; it is characterized in that being arranged at intervals columnar protection screen and secondary coil successively from inside to outside in major insulation body; cylindrical shape protection screen is inlaid on secondary coil internal diameter; and be isolated with secondary coil by kraft capacitor paper; cylindrical shape protection screen is inc open loop type structure, and protection screen is connected by lead with ground connection inserts.It is characterized in current transformer when overvoltage occurs in electric power system; by the setting of protection screen in current transformer, overvoltage is conducted to ground, protective current mutual inductor coil and equipment secondary circuit are not burned out; the stability of system power supply is improved, system operation is more safe and reliable.
Description
Technical field
The utility model is related to a kind of current transformer, particularly a kind of current transformer with breakdown protection.
Background technology
Low pressure straight-through current transformer is the important devices of low-voltage power supply system measurement, metering, instrument and relay protection,
The hinge that it mutually gets in touch with as electric secondary circuit and primary system, while electric signal is transmitted, by instrument, relay and operation
Personnel are dielectrically separated from protection with primary system, it is ensured that the safety of secondary circuit and operations staff.The Current Mutual Inductance of punching structure
Current transformer is connected in once returning for electric power system by device, its cable or copper bar directly through current transformer endoporus
Lu Zhong.At present, the anti-breakdown of current transformer is simply protected by epoxy resin layer, but sometimes mutual by installing space, electric current
The conditions such as sensor volume, weight are limited, the increase that the insulation of epoxy resin layer can not be unlimited.When overvoltage event occurs for primary system
During barrier, current transformer insulation ability to bear can be substantially exceeded, voltage causes damage to secondary coil insulation, causes Current Mutual Inductance
Device is damaged, and influence system is normally run.
The content of the invention
The purpose of this utility model is a kind of current transformer with breakdown protection of offer, and it is simple in construction, is easy to system
Make, protective current transformer secondary coil can be burned out when overvoltage occurs for system.
Technical solution of the present utility model is：A kind of current transformer with breakdown protection, including secondary coil and
Major insulation body, it is characterised in that be arranged at intervals columnar protection screen and secondary coil successively from inside to outside in major insulation body,
Cylindrical shape protection screen is inlaid on secondary coil internal diameter, and is isolated with secondary coil by kraft capacitor paper, cylindrical shape protection screen
For inc open loop type structure, protection screen is connected by lead with ground connection inserts.
Described cylindrical shape protection screen height is identical with secondary coil or slightly above secondary coil.
Outside is provided with insulating materials on the outside of after described cylindrical shape protection screen expansion and in two ends, and cylindrical shape protection screen is opened
Collar extension overlapping mutually insulated is isolated.
Described cylindrical shape protection screen is arranged concentrically with secondary coil.
The current transformer with breakdown protection that the utility model is provided, is to set same in Current Transformer Secondary coil
The open loop cylindrical shape protection screen of the heart, and be connected protection screen with ground connection inserts by lead.When system is normally run, protection screen is good
Good insulation and ground state, make protection screen have zero potential.When system has overvoltage failure, overvoltage acts directly on guarantor
On shield screen, and conducted by protection screen to ground.Overvoltage will not be applied on secondary coil, so that current transformer and equipment
Secondary circuit is protected.
The characteristics of the utility model is：Current transformer is when overvoltage occurs in electric power system, by current transformer
The setting of protection screen, overvoltage is conducted to ground, protective current transformer and equipment secondary circuit are not burned out, and improve system
The stability of power supply, system operation is more safe and reliable.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 for Fig. 1 A-A to sectional view.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings：
As shown in Figure 1, 2, the current transformer with breakdown protection is punching structure, mainly by secondary coil 2, cylindrical shape
Protection screen 1 and major insulation body 3 are constituted.Secondary coil 2 is constituted by circular iron core and around the wire on iron core.Cylindrical shape
Outside in the cylinder of open loop shape, the outside and two ends of copper foil is made of copper foil or other sheet metals and uses insulation for protection screen
Material 6 is kraft capacitor paper cladding, and formation is dielectrically separated from secondary coil, and being dielectrically separated from for open loop mouthful overlapping, is prevented
Only copper foil closure produces induced-current.The setting of kraft capacitor paper can also prevent because major insulation material resin be possible to filling less than
And influence insulating properties.Leaded 4 are connected on protection screen, the other end of lead is connected with ground connection inserts 5.Cylindrical shape protection screen
The height of secondary coil is highly should be greater than, by the complete shielding protection of secondary coil.Cylindrical shape protection screen is inlaid in secondary coil
On footpath, it is arranged concentrically with secondary coil, including protection screen, secondary coil is outside, at regular intervals between the two.Major insulation body is adopted
It is molded with poured with epoxy resin.
In normal operation, the current transformer insulation being arranged on a cable is good, and protection screen is not charged, and passes through
Ground connection inserts is connected with the earth, with zero potential.When system has overvoltage failure, overvoltage is acted directly on protection screen 1,
And conducted by lead and ground connection inserts to ground, it will not be caused punch through because of overvoltage, so that current transformer and equipment two
Minor loop is protected.
Claims (4)
1. a kind of current transformer with breakdown protection, including secondary coil and major insulation body, it is characterised in that in major insulation body
Inside it is arranged at intervals columnar protection screen and secondary coil successively from inside to outside, cylindrical shape protection screen is inlaid in secondary coil internal diameter
On, and be isolated with secondary coil by kraft capacitor paper, cylindrical shape protection screen is inc open loop type structure, and protection screen passes through
Lead is connected with ground connection inserts.
2. the current transformer according to claim 1 with breakdown protection, it is characterised in that described cylindrical shape protection screen
Height is identical with secondary coil or slightly above secondary coil.
3. the current transformer according to claim 1 with breakdown protection, it is characterised in that described cylindrical shape protection screen
Outside is provided with insulating materials, the mutually insulated isolation of cylindrical shape protection screen open loop mouthful overlapping on the outside of after expansion and in two ends.
4. the current transformer according to claim 1 with breakdown protection, it is characterised in that described cylindrical shape protection screen
It is arranged concentrically with secondary coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621083352.9U CN206388604U (en) | 2016-09-27 | 2016-09-27 | A kind of current transformer with breakdown protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621083352.9U CN206388604U (en) | 2016-09-27 | 2016-09-27 | A kind of current transformer with breakdown protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206388604U true CN206388604U (en) | 2017-08-08 |
Family
ID=59487172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621083352.9U Expired - Fee Related CN206388604U (en) | 2016-09-27 | 2016-09-27 | A kind of current transformer with breakdown protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206388604U (en) |
-
2016
- 2016-09-27 CN CN201621083352.9U patent/CN206388604U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170808 Termination date: 20200927 |