CN205029322U - Current transformer prevents open circuit protection device - Google Patents
Current transformer prevents open circuit protection device Download PDFInfo
- Publication number
- CN205029322U CN205029322U CN201520823751.3U CN201520823751U CN205029322U CN 205029322 U CN205029322 U CN 205029322U CN 201520823751 U CN201520823751 U CN 201520823751U CN 205029322 U CN205029322 U CN 205029322U
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- CN
- China
- Prior art keywords
- current transformer
- silicon controlled
- detect switch
- temperature detect
- controlled rectifier
- 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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- Emergency Protection Circuit Devices (AREA)
- Protection Of Transformers (AREA)
Abstract
The utility model discloses a current transformer prevents open circuit protection device, current transformer, silicon controlled rectifier, bidirectional trigger diode and temperature detect switch, current transformer is connected with the ampere meter, silicon controlled rectifier, temperature detect switch and ampere meter parallel connection, bidirectional trigger diode one end is connected with the one end of silicon controlled rectifier, the bidirectional trigger diode other end is connected with the other end of silicon controlled rectifier, is provided with resistance between and, current transformer establishes ties into the return circuit with the ampere meter, silicon controlled rectifier, bidirectional trigger diode and temperature detect switch all set up inside the return circuit, the utility model discloses a set up silicon controlled rectifier and temperature detect switch, the heat that produces through silicon controlled rectifier turn -on time acts on switching on of temperature detect switch, forms duplicate protection, simple structure, simple to operate to the return circuit on the basis of silicon controlled rectifier.
Description
technical field:
The utility model relates to a kind of anti-open-circuit protecting device, particularly relates to the anti-open-circuit protecting device of a kind of current transformer.
background technology:
In electric power system, the effect of current transformer is that primary side big current is converted to secondary side small area analysis to measure, in generating, power transformation, transmission of electricity, size of current great disparity in the circuit of distribution and electricity consumption, have from a few peace to a little Wan An, for ease of measuring, protection and control need to be converted to more unified electric current, voltage in addition on circuit is general all higher is breakneck as directly measured, current transformer just plays current transformation and electrical isolation effect, the first side winding number of turn of current transformer is little, go here and there in the circuit needing the electric current measured, therefore it often has whole electric currents of circuit to flow through, secondary side winding turn ratio is more, be serially connected in measuring instrument and protective loop, current transformer operationally, its secondary side circuit is closed all the time, therefore the impedance of measuring instrument and protective loop series coil is very little, the operating state of current transformer is close to short circuit, current transformer is that primary side big current is converted to secondary side small area analysis to measure, secondary side can not be opened a way, therefore, in use, if current transformer secondary side is opened a way, primary current is excitatory by being all used for, make iron core seriously saturated, the magnetic flux of alternation will induce very high voltage on secondary coil, its peak value can reach several kilovolts of volts even up to ten thousand, so high voltage acts on secondary coil and secondary circuit, by serious threat personal safety and device security, even coil insulation burns out because of overheated.
utility model content:
Technical problem to be solved in the utility model is: overcome the deficiencies in the prior art; there is provided a kind of structure simple, by arranging controllable silicon and temperature detect switch (TDS); the heat produced by the controlled silicon conducting time acts on the conducting of temperature detect switch (TDS), and silicon controlled basis is formed loop the anti-open-circuit protecting device of current transformer of duplicate protection.
The technical solution of the utility model is: the anti-open-circuit protecting device of a kind of current transformer; current transformer, controllable silicon, bidirectional trigger diode and temperature detect switch (TDS); described current transformer is connected with ammeter; described controllable silicon, temperature detect switch (TDS) and ammeter parallel join; described bidirectional trigger diode one end is connected with silicon controlled one end; the described bidirectional trigger diode other end is connected with the silicon controlled other end, and between be provided with resistance.
Described current transformer and ammeter are connected into loop, and described controllable silicon, bidirectional trigger diode and temperature detect switch (TDS) are all arranged on loop inner.
The beneficial effects of the utility model are:
1, the utility model is by arranging controllable silicon and temperature detect switch (TDS), and the heat produced by the controlled silicon conducting time acts on the conducting of temperature detect switch (TDS), and silicon controlled basis forms duplicate protection to loop, and structure is simple, easy for installation.
2, there are certain internal resistance components and parts easily to generate heat after the utility model controlled silicon conducting, affect its long-term normal operation, utilize the temperature that it generates heat, adopt temperature detect switch (TDS) to bypass its loop current; After temperature reaches certain value, the adhesive of temperature detect switch (TDS) mechanical contact, ensures the safe and reliable work of controllable silicon.
accompanying drawing illustrates:
Fig. 1 is the circuit connection diagram of the anti-open-circuit protecting device of current transformer.
embodiment:
Embodiment: see Fig. 1.
The anti-open-circuit protecting device of current transformer; current transformer, controllable silicon, bidirectional trigger diode and temperature detect switch (TDS); current transformer is connected with ammeter; controllable silicon, temperature detect switch (TDS) and ammeter parallel join; bidirectional trigger diode one end is connected with silicon controlled one end; the bidirectional trigger diode other end is connected with the silicon controlled other end, and between be provided with resistance.
Current transformer and ammeter are connected into loop, and controllable silicon, bidirectional trigger diode and temperature detect switch (TDS) are all arranged on loop inner.
During use, when current transformer normally works, its secondary institute bringing onto load ammeter, the internal resistances such as measuring element are all very little, and resistance is almost nil, therefore bidirectional trigger diode D1 two ends almost no-voltage, and anti-open-circuit does not work.
When Current Transformer Secondary ammeter, measuring component etc. are opened a way extremely, loop produces high voltage instantaneously, reach the trigger voltage of anti-open circuit bidirectional trigger diode D1, D1 work triggers controllable silicon U1 conducting, play Current Transformer Secondary and prevent open circuit effect, when the normal time open circuit of Current Transformer Secondary ammeter, controllable silicon U1 is when having electric current to pass through for a long time, the internal resistance components and parts heating of controllable silicon U1, after temperature reaches certain value, the adhesive of temperature detect switch (TDS) t0 mechanical contact, ensures the safe and reliable work of controllable silicon U1.
The above, it is only preferred embodiment of the present utility model, not any pro forma restriction is done to the utility model, every above embodiment is done according to technical spirit of the present utility model any simple modification, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (2)
1. the anti-open-circuit protecting device of current transformer; current transformer, controllable silicon, bidirectional trigger diode and temperature detect switch (TDS); it is characterized in that: described current transformer is connected with ammeter; described controllable silicon, temperature detect switch (TDS) and ammeter parallel join; described bidirectional trigger diode one end is connected with silicon controlled one end; the described bidirectional trigger diode other end is connected with the silicon controlled other end, and between be provided with resistance.
2. the anti-open-circuit protecting device of current transformer according to claim 1, it is characterized in that: described current transformer and ammeter are connected into loop, described controllable silicon, bidirectional trigger diode and temperature detect switch (TDS) are all arranged on loop inner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520823751.3U CN205029322U (en) | 2015-10-23 | 2015-10-23 | Current transformer prevents open circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520823751.3U CN205029322U (en) | 2015-10-23 | 2015-10-23 | Current transformer prevents open circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205029322U true CN205029322U (en) | 2016-02-10 |
Family
ID=55261826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520823751.3U Expired - Fee Related CN205029322U (en) | 2015-10-23 | 2015-10-23 | Current transformer prevents open circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205029322U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727991A (en) * | 2017-10-30 | 2018-02-23 | 珠海易赛特电子科技有限公司 | A kind of anti-observation circuit and the anti-open circuit monitoring devices of CT of opening a way of CT |
-
2015
- 2015-10-23 CN CN201520823751.3U patent/CN205029322U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727991A (en) * | 2017-10-30 | 2018-02-23 | 珠海易赛特电子科技有限公司 | A kind of anti-observation circuit and the anti-open circuit monitoring devices of CT of opening a way of CT |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160210 Termination date: 20161023 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |