CN2857176Y - General current transformer - Google Patents
General current transformer Download PDFInfo
- Publication number
- CN2857176Y CN2857176Y CN 200520127594 CN200520127594U CN2857176Y CN 2857176 Y CN2857176 Y CN 2857176Y CN 200520127594 CN200520127594 CN 200520127594 CN 200520127594 U CN200520127594 U CN 200520127594U CN 2857176 Y CN2857176 Y CN 2857176Y
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- CN
- China
- Prior art keywords
- current transformer
- secondary coil
- open circuit
- iron core
- model
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- 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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- Coils Or Transformers For Communication (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The utility model relates to a general current transformer and a current transformer of a secondary open circuit, which includes a iron-core, a first coil, a secondary coil which is an open circuit. The utility model has simple structure, easy manufacturing, relatively small volume.
Description
Technical field
The utility model relates to a kind of universal current transformer, particularly about the current transformer of second open circuit.
Background technology
At present, be used for the electric power system current transformer, its primary winding is serially connected in electrorheological than in the circuit, and secondary coil is connected in series all kinds of relays and the transmitter of various instrument and protection system control loop and forms secondary circuit.Because the device impedance of above-mentioned serial connection is all very little, thus current transformer when normal operation, secondary side is near short-circuit condition.But, the understanding of academia at present: in case the secondary circuit open circuit, the number of ampere turns of primary winding will all be used for excitatory, make iron core be in the height saturation condition, core loss and temperature excursion, at this moment, can respond to very high voltage in the secondary coil, jeopardize various device and the operator safety of string at secondary circuit.For this reason, the cost of manufacture of current transformer is higher, volume is big, manufacture craft is also complicated.
The utility model content
Technical problem to be solved in the utility model is to propose a kind of making simply, and cost is lower, the universal current transformer that volume is less relatively.
Technical scheme provided by the utility model is: a kind of universal current transformer, and it comprises iron core, primary winding, secondary coil, described secondary coil is open circuit.
Further, described secondary coil adopts sectional area 250mm
2The copper core coiling.
Further, described secondary coil is 29 circles, and the iron core average diameter is 5.5cm.
Further, described iron core adopts cold-reduced silicon sheet.
The utility model has following advantage: because secondary circuit is open circuit, the volume of current transformer can be done forr a short time relatively; Simple in structure, it is easier to make.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Illustrate: 1: primary winding 2: iron core 3: secondary coil
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.
A kind of universal current transformer as shown in Figure 1, it comprises iron core 2, primary winding 1, secondary coil 3, and described secondary coil 3 is open circuit, and primary winding 1 is connected in the circuit of electrorheological ratio, and iron core 2 adopts cold-reduced silicon sheet.
Specific embodiment: the electrorheological ratio is 150/5, and when a field ampere-turns was 1350, second open circuit voltage was 3.38V, and secondary coil 3 numbers of turn are 29 circles, and secondary coil adopts sectional area 250mm
2The copper core coiling, the long 2.5cm in square-section, wide 1.1cm, annular core 2 average diameter 5.5cm, annular core 2 sectional areas 2.75 * 10-4m
2, the average length of magnetic path 0.1728m of annular core 2.
Be the utility model second open circuit voltage tester value below:
| The electricity consumption title | Running current voltage | The model no-load voltage ratio | Name of manufacturing factory | Second open circuit voltage |
| #10 air compressor machines | 85A/0.4KV | LMK1 150/5 | Pingdu switchgear plant | 3.1V |
| System bottle workshop | 265A/0.4KV | LMK1 500/5 | Pingdu switchgear plant | 11.4V |
| #11 air compressor machines | 200A/0.4KV | LMK1 300/5 | Pingdu switchgear plant | 6.7V |
| #6 air compressor machines | 300A/0.4KV | LMK1 300/5 | Pingdu switchgear plant | 6.8V |
| #1 main transformer | 1000A/0.4KV | LM/J1 2000/5 | Xi'an Samsung factory | 36V |
By above test as can be known, the second open circuit voltage overwhelming majority of the following all kinds of current transformers of 10KV and 10KV is a few volt to tens volts.
Claims (4)
1, a kind of universal current transformer, it comprises iron core, primary winding, secondary coil, it is characterized in that: described secondary coil is open circuit.
2, universal current transformer according to claim 1 is characterized in that: described secondary coil is 250mm by sectional area
2The copper core coiling form.
3, universal current transformer according to claim 1 and 2 is characterized in that: described secondary coil is 29 circles, and the iron core average diameter is 5.5cm.
4, universal current transformer according to claim 1 is characterized in that: described iron core adopts cold-reduced silicon sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520127594 CN2857176Y (en) | 2005-11-10 | 2005-11-10 | General current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520127594 CN2857176Y (en) | 2005-11-10 | 2005-11-10 | General current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2857176Y true CN2857176Y (en) | 2007-01-10 |
Family
ID=37600480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520127594 Expired - Fee Related CN2857176Y (en) | 2005-11-10 | 2005-11-10 | General current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2857176Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009000159A1 (en) * | 2007-06-25 | 2008-12-31 | Cuipei Hu | Low energy-consuming series current transformer for 1-1000 kv transformer detect |
-
2005
- 2005-11-10 CN CN 200520127594 patent/CN2857176Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009000159A1 (en) * | 2007-06-25 | 2008-12-31 | Cuipei Hu | Low energy-consuming series current transformer for 1-1000 kv transformer detect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070110 Termination date: 20121110 |