CN207517468U - A kind of current transformer - Google Patents
A kind of current transformer Download PDFInfo
- Publication number
- CN207517468U CN207517468U CN201721338295.9U CN201721338295U CN207517468U CN 207517468 U CN207517468 U CN 207517468U CN 201721338295 U CN201721338295 U CN 201721338295U CN 207517468 U CN207517468 U CN 207517468U
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- winding
- grade
- magnetic core
- protected level
- layer
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Abstract
A kind of current transformer sets primary side and secondary side in insulation shell.Secondary side, which has, measures grade magnetic core and protected level magnetic core.It is arranged in first winding and measures grade magnetic core, around grade winding conducting wire is measured, peripheral hardware buffer layer is outermost to have shielded layer.Protected level magnetic core is arranged in first winding, around protected level winding conducting wire, peripheral hardware group buffer layer is outermost to have shielded layer.Parallel resistance R between two output terminal of measurement grade winding conducting wire.It is crystallite magnetic core to measure grade magnetic core.Protected level magnetic core is silicon steel core.The silicon steel sheet of protected level magnetic core keeps the temperature 34 hours through 780 DEG C of annealing of inflated with nitrogen.Insulation shell is epoxy resin：Acid anhydrides：Toughener：Silicon powder=1：0.75：0.25：The 2.6 material vacuum cast mixed.This current transformer is to eliminate the high danger of conventional current mutual inductor open-circuit voltage.It is small to measure grade core volume, and thin, output reaches millivolt level, is exported for micropower.
Description
Technical field
The utility model belongs to current transformer field, especially wants to be related to a kind of current transformer.
Background technology
Current conventional current mutual inductor has the high danger of open-circuit voltage, its meeting under overcurrent situations of protected level magnetic core
Too early saturation, it is impossible to correctly reflection system parameters variation, it is impossible to ensure that traditional relay protection device can reliably start.
Utility model content
The purpose of this utility model is to provide a kind of current transformer, and it is high to eliminate conventional current mutual inductor open-circuit voltage
It is dangerous.
The technical solution adopted is that：
Including insulation shell, primary side and secondary side are equipped in insulation shell for a kind of current transformer.
Technical points are：
The first winding of primary side is located in insulation shell, the both ends of first winding connect respectively primary current end of incoming cables and
Primary current leading-out terminal is coated with primary shield on the outside of first winding.
Secondary side includes measuring grade magnetic core and protected level magnetic core.
Be arranged in first winding measure grade magnetic core, measure grade magnetic core on be arranged with measure grade winding conducting wire, measure grade around
Group conducting wire, which is externally provided with, measures grade winding buffer layer, measures grade winding buffer layer and is wrapped with measurement grade winding shielded layer.
Two output terminal of grade winding conducting wire is measured to be correspondingly connected with secondary terminals.
Protected level magnetic core is also arranged in first winding, protected level winding conducting wire, protected level are arranged on protected level magnetic core
Winding conducting wire is externally provided with protected level winding buffer layer, and protected level winding buffer layer is wrapped with protected level winding shielded layer.
Two output terminal of protected level winding conducting wire is correspondingly connected with secondary terminals.
It measures grade winding shielded layer and protected level winding shielded layer connects secondary stent jointly.
Parallel resistance R between two output terminal of measurement grade winding conducting wire.
It is crystallite magnetic core to measure grade magnetic core.Protected level magnetic core is silicon steel core.
The silicon steel sheet of protected level magnetic core keeps the temperature 3-4 hours through the annealing of 780 DEG C of inflated with nitrogen, then natural cooling and obtain.
Measure the outer diameter 120-130mm, internal diameter 85-95mm, thickness 3-7mm of grade magnetic core.
Measure the main cross section product of grade magnetic core is accumulated for the main cross section of conventional measurement magnitude magnetic core 1/6th.
Technical parameter：Model：LFZE-10, voltage class：10kV, electric current ratio：5~1000A/5, accuracy class：Measure grade
0.5/ protected level 10P, capacity：2k Ω/10VA, frequency：50Hz.
It the advantage is that：
This current transformer is epoxide resin vacuum cast micropower current transformer, can eliminate conventional current mutual inductor and open
The high danger of road voltage.It is small to measure grade core volume, and thin, output reaches millivolt level, is exported for micropower.
This model current transformer be totally-enclosed wall-penetrating type structure, suitable for indoor 50Hz, rated voltage for 10kV and with
Under power circuit and its equipment in make electric current, the measurement of electric energy and used for relay protection.
Description of the drawings
Fig. 1 is the sectional view of the utility model.
Fig. 2 is the front view of the utility model.
Fig. 3 is the side view of the utility model.
Fig. 4 is a kind of form of K direction views in Fig. 3.
Fig. 5 is the side view of Fig. 4.
Fig. 6 is another form of K direction views in Fig. 3.
Fig. 7 is the side view of Fig. 6.
Fig. 8 is the circuit diagram of parallel resistance R between two output terminal of measurement grade winding conducting wire.
Primary current end of incoming cables 1, insulation shell 2, first winding 3, primary shield 4, strip copper conductor 5, primary current go out
Line end 6, protected level magnetic core 8, protected level winding conducting wire 9, protected level winding buffer layer 10, measures grade at protected level winding shielded layer 7
Magnetic core 11 measures grade winding conducting wire 12, measures grade winding buffer layer 13, measure grade winding shielded layer 14, is secondary terminals 15, secondary
Stent 16, mounting hole 17.
Specific embodiment
Including insulation shell 2, primary side and secondary side are equipped in insulation shell 2 for a kind of current transformer.
The first winding 3 of primary side is located in insulation shell 2, and the both ends of first winding 3 connect primary current inlet wire respectively
End 1 and primary current leading-out terminal 6, the outside of first winding 3 are coated with primary shield 4.
Secondary side includes measuring grade magnetic core 11 and protected level magnetic core 8.
It is arranged in first winding 3 and measures grade magnetic core 11, measured and measurement grade winding conducting wire 12 is arranged on grade magnetic core 11, survey
Magnitude winding conducting wire 12, which is externally provided with, measures grade winding buffer layer 13, measures grade winding buffer layer 13 and is wrapped with measurement grade around group screen
Cover layer 14.
Grade 12 liang of output terminals of winding conducting wire are measured to be correspondingly connected with secondary terminals 15.
Protected level magnetic core 8 is also arranged in first winding 3, protected level winding conducting wire 9 is arranged on protected level magnetic core 8, is protected
Shield grade winding conducting wire 9 is externally provided with protected level winding buffer layer 10, and protected level winding buffer layer 10 is wrapped with protected level around group screen
Cover layer 7.
9 liang of output terminals of protected level winding conducting wire are correspondingly connected with secondary terminals 15.
It measures grade winding shielded layer 14 and protected level winding shielded layer 7 connects secondary stent, and pass through insulation shell 2 jointly
Interior secondary stent 16 is grounded.
Parallel resistance R between measurement grade 12 liang of output terminals of winding conducting wire.
Secondary device body shielding is by semiconductive material（Semiconductive crimped paper）It is uniform coated in secondary winding（Measure grade around
Group conducting wire 12 and protected level winding conducting wire 9）On, protected level winding shielded layer 7 and measurement grade winding shielded layer 14 contact with each other, shape
Into a secondary shield, secondary winding is integrally located in the secondary shield and is shielded, measure and protect two it is secondary
Two mutually insulateds of winding, but sealed by same secondary shield, secondary shield passes through secondary stent 16（Technical support mount）
Ground connection.
All insulating wrapping materials of product primary side are all shielding for high-voltage potential side, similary secondary side it is secondary around
Group is all shielded the appearance of the floating potential in ground potential, prevented, so as to reduce shelf depreciation value.
It measures 12 liang of output terminals of grade winding conducting wire and the 1S1 and 1S2 of secondary terminals 15 is correspondingly connected with.
9 liang of output terminals of protected level winding conducting wire and the 2S1 and 2S2 of secondary terminals 15 are correspondingly connected with.
First winding 3 is formed for 5 coiling of strip copper conductor.
Primary shield 4 is semiconductive wrinkle paper layer.It is semiconductive wrinkle paper layer to measure grade winding shielded layer 14.Protected level
Winding shielded layer 7 is semiconductive wrinkle paper layer.
Insulation shell 2 is epoxy resin housing.
It is crystallite magnetic core to measure grade magnetic core 11：Magnetic flux density is less than 0.2T, so as to fulfill anti-saturation, is concatenated in secondary circuit
Current signal is converted to low voltage signal by one resistance R, and eliminates the high danger of conventional current mutual inductor open-circuit voltage.
It is polyamine ester layer to measure grade winding buffer layer 13.Protected level winding buffer layer 10 is polyamine ester layer.
Protected level magnetic core 8 is silicon steel core.
The silicon steel sheet of the use high saturation magnetic flux density of protected level magnetic core 8 keeps the temperature 3 hours, can incite somebody to action through 780 DEG C of annealing of inflated with nitrogen
8 magnetic property of protected level magnetic core is restored to optimum state, and design magnetic flux density takes 1.5T, makes it will not mistake under overcurrent situations
Early saturation can correctly reflect that system parameters change, it is ensured that traditional relay protection device can reliably start.
The outer diameter for measuring grade magnetic core 11 is 120mm, internal diameter 85mm, thickness 3mm.
Mounting hole 17 is offered on 2 middle part installing plate of insulation shell.
Embodiment 2
Embodiment 1 and embodiment 2 are essentially identical, the difference is that：
The measurement grade winding buffer layer 13 is silastic-layer.Protected level winding buffer layer 10 is silastic-layer.
Insulation shell 2 uses vacuum casting process, and the insulating materials of insulation shell 2 is epoxy resin：Acid anhydrides：Toughener：
Silicon powder=1：0.75：0.25：2.6（Mass ratio）It mixes.
Acid anhydrides is：The third acid anhydride of methyl tetrahydrochysene.Toughener is：Polyamide, silicon powder mesh number are 400 mesh.
Annealing heat preservation 4 hours.
Measure grade magnetic core 11 outer diameter 130mm, internal diameter 95mm, thickness 7mm.
Embodiment 3
Embodiment 3 is substantially the same manner as Example 2, the difference is that：
Annealing heat preservation 3.5 hours.Measure grade magnetic core 11 outer diameter 125mm, internal diameter 90mm, thickness 5mm.
Primary current enters first winding 3 through 1 side of electric current end of incoming cables P1 primary currents end of incoming cables, first winding 3 it is primary
Strip copper conductor 5, which passes through, measures grade magnetic core 11 and protected level magnetic core 8, then flow from primary current leading-out terminal P2 primary currents leading-out terminal 6
Go out.
Primary current, which passes through, measures grade magnetic core 11 and protected level magnetic core 8, and grade winding can be being measured according to electromagnetic induction principle
Current signal is formed on conducting wire 12 and protected level winding conducting wire 9, test and protection signal are exported by secondary terminals 15.
3 outer layer of first winding is equipped with primary shield 4.
Secondary winding also is provided with measuring grade winding buffer layer 13, protected level winding buffer layer 10, measures grade winding shielded layer
14 and protected level winding shielded layer 7, secondary shield is formed, effect is for reducing partial discharge level, preventing high pressure to low pressure two
The interference of secondary signal, it is for preventing insulation shell 2 to measure grade winding buffer layer 13 and protected level winding buffer layer 10（It is all real
Apply 2 material of insulation shell in example）The contraction of interiors of products is squeezed.
The above-mentioned insulating materials used is poured into a mould under vacuum conditions, and primary secondary all windings are cast in insulation shell
, it can be achieved that high electric strength, low office's discharge level, service life is long inside body 2, the target of oil-free environmental protection.All material is H
Grade heat proof material, meets the fire protection requirement of fire department；
Small-signal can be realized by measuring winding signal（Millivolt level）Output protects equipment interconnection with electronic type, and protected level can drive
Traditional relay protection equipment.
Claims (8)
1. including insulation shell (2), primary side and secondary side are equipped in insulation shell (2) for a kind of current transformer；Its feature exists
In：
The first winding (3) of primary side is located in insulation shell (2), the both ends of first winding (3) connect respectively primary current into
Line end (1) and primary current leading-out terminal (6) are coated with primary shield (4) on the outside of first winding (3)；
Secondary side includes measuring grade magnetic core (11) and protected level magnetic core (8)；
It is arranged in first winding (3) and measures grade magnetic core (11), measured and measurement grade winding conducting wire is arranged on grade magnetic core (11)
(12), it measures grade winding conducting wire (12) and is externally provided with measurement grade winding buffer layer (13), measure grade winding buffer layer (13) outer wrapping
Have and measure grade around shielded layer (14)；
(12) two output terminal of grade winding conducting wire is measured to be correspondingly connected with secondary terminals (15)；
Protected level magnetic core (8) is also arranged in first winding (3), protected level magnetic core is arranged with protected level winding conducting wire on (8)
(9), protected level winding conducting wire (9) is externally provided with protected level winding buffer layer (10), and protected level winding buffer layer (10) is wrapped with
Protected level winding shielded layer (7)；
(9) two output terminal of protected level winding conducting wire is correspondingly connected with secondary terminals (15)；
It measures grade and connects secondary stent jointly around shielded layer (14) and protected level winding shielded layer (7)；
Parallel resistance R between (12) two output terminal of measurement grade winding conducting wire.
2. a kind of current transformer according to claim 1, it is characterised in that：First winding (3) for strip copper conductor (5) around
It makes.
3. a kind of current transformer according to claim 1, it is characterised in that：Primary shield (4) is semiconductive wrinkle
Paper layer；It is semiconductive wrinkle paper layer that grade, which is measured, around shielded layer (14)；Protected level winding shielded layer (7) is semiconductive wrinkle paper layer.
4. a kind of current transformer according to claim 1, it is characterised in that：It is crystallite magnetic core to measure grade magnetic core (11).
5. a kind of current transformer according to claim 1, it is characterised in that：Protected level magnetic core (8) is silicon steel core.
6. a kind of current transformer according to claim 1, it is characterised in that：It is polyamine to measure grade winding buffer layer (13)
Ester layer or silastic-layer；Protected level winding buffer layer (10) is polyamine ester layer or silastic-layer.
7. a kind of current transformer according to claim 1, it is characterised in that：Measure the outer diameter 120- of grade magnetic core (11)
130mm, internal diameter 85-95mm, thickness 3-7mm.
8. a kind of current transformer according to claim 7, it is characterised in that：The outer diameter 125mm of grade magnetic core (11) is measured,
Internal diameter 90mm, thickness 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721338295.9U CN207517468U (en) | 2017-10-18 | 2017-10-18 | A kind of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721338295.9U CN207517468U (en) | 2017-10-18 | 2017-10-18 | A kind of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207517468U true CN207517468U (en) | 2018-06-19 |
Family
ID=62535873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721338295.9U Expired - Fee Related CN207517468U (en) | 2017-10-18 | 2017-10-18 | A kind of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207517468U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109119238A (en) * | 2018-07-03 | 2019-01-01 | 大连第二互感器集团有限公司 | A kind of current transformer and preparation method thereof |
-
2017
- 2017-10-18 CN CN201721338295.9U patent/CN207517468U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109119238A (en) * | 2018-07-03 | 2019-01-01 | 大连第二互感器集团有限公司 | A kind of current transformer and preparation method thereof |
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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 |
Granted publication date: 20180619 Termination date: 20191018 |
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| CF01 | Termination of patent right due to non-payment of annual fee |