CN214479567U - Open circuit protection module for current transformer - Google Patents
Open circuit protection module for current transformer Download PDFInfo
- Publication number
- CN214479567U CN214479567U CN202120661103.8U CN202120661103U CN214479567U CN 214479567 U CN214479567 U CN 214479567U CN 202120661103 U CN202120661103 U CN 202120661103U CN 214479567 U CN214479567 U CN 214479567U
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- China
- Prior art keywords
- current transformer
- limiting resistor
- voltage stabilizing
- current limiting
- stabilizing diode
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Abstract
The invention discloses an open-circuit protection module of a current transformer, which comprises a bidirectional thyristor K, a voltage stabilizing diode DZ1, a voltage stabilizing diode DZ2, a current limiting resistor R1 and a current limiting resistor R2; the first anode T1 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ1, the connecting end is used for connecting one end of the secondary side of the current transformer, the second anode T2 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ2, the connecting end is used for connecting the other end of the secondary side of the current transformer, the anode of the voltage stabilizing diode DZ1 is connected with one end of a current limiting resistor R1, the anode of the voltage stabilizing diode DZ2 is connected with one end of a current limiting resistor R2, and the other end of the current limiting resistor R1 is connected with the other end of a current limiting resistor R2 and the control electrode G of the bidirectional thyristor K. Compared with the prior art, the open-circuit protection module of the current transformer does not need an auxiliary power supply, and is simple in topological structure, high in reliability, low in cost and easy to popularize.
Description
Technical Field
The invention relates to the field of current transformer application, in particular to an open-circuit protection module for a current transformer.
Background
Nowadays, current transformer mainly uses the occasion that alternating current ammeter range is less than the actual measurement alternating current, and is different from voltage transformer, and current transformer does not allow the operation of opening a way, and current transformer opens a way the consequence seriously, mainly shows: the high peak voltage is generated between the secondary side winding and the two points of the open circuit of the current transformer, the insulation of equipment and the personal safety are threatened, the iron core loss is increased rapidly, the insulation is burnt seriously, and the residual magnetism is generated in the iron core, so that the transformation ratio and the phase angle error of the current transformer are increased, the metering accuracy is influenced, and the secondary side open circuit protection of the current transformer is very important.
The inventor finds that most of the open-circuit protection modules of the current transformer adopted at the present stage need auxiliary power supplies, the topological structure is complex, the reliability is low, and the cost is relatively high in the implementation process of the invention.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an open-circuit protection module of a current transformer, which adopts the technical scheme that: comprises a bidirectional thyristor K, a voltage stabilizing diode DZ1, a voltage stabilizing diode DZ2, a current limiting resistor R1 and a current limiting resistor R2; the first anode T1 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ1, the connecting end is used for connecting one end of the secondary side of the current transformer, the second anode T2 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ2, the connecting end is used for connecting the other end of the secondary side of the current transformer, the anode of the voltage stabilizing diode DZ1 is connected with one end of a current limiting resistor R1, the anode of the voltage stabilizing diode DZ2 is connected with one end of a current limiting resistor R2, and the other end of the current limiting resistor R1 is connected with the other end of a current limiting resistor R2 and the control electrode G of the bidirectional thyristor K.
Compared with the prior art, the open-circuit protection module of the current transformer has the advantages that an auxiliary power supply is not needed, the topological structure is simple, the reliability is high, the cost is low, and the popularization is easy.
Drawings
Fig. 1 is a typical schematic diagram of an open-circuit protection module of a current transformer according to the present invention.
Fig. 2 is a specific embodiment of an open-circuit protection module for a current transformer according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments thereof are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 1, a typical schematic diagram of an open-circuit protection module of a current transformer according to the present invention includes a triac K, a zener diode DZ1, a zener diode DZ2, a current limiting resistor R1, and a current limiting resistor R2; the first anode T1 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ1, the connecting end is used for connecting one end of the secondary side of the current transformer, the second anode T2 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ2, the connecting end is used for connecting the other end of the secondary side of the current transformer, the anode of the voltage stabilizing diode DZ1 is connected with one end of a current limiting resistor R1, the anode of the voltage stabilizing diode DZ2 is connected with one end of a current limiting resistor R2, and the other end of the current limiting resistor R1 is connected with the other end of a current limiting resistor R2 and the control electrode G of the bidirectional thyristor K.
As shown in fig. 2, in an embodiment of the open-circuit protection module for a current transformer of the present invention, the zener diode DZ1 and the zener diode DZ2 are both 1N4734A, and the maximum reverse voltage of the zener diode is 5.6V; the model of the bidirectional thyristor K is BT 136; the resistance values of the current limiting resistor R1 and the current limiting resistor R2 are both 470 omega; when a TA secondary circuit of the current transformer is in a non-open-circuit state, the open-circuit protection module of the current transformer does not act, a short-circuit power channel cannot be provided for the secondary side of the current transformer, and the alternating current ammeter can normally display the short-circuit power channel; when a TA secondary circuit of the current transformer is in an open-circuit state, the open-circuit protection module of the current transformer acts to provide a short-circuit power channel for the secondary side of the current transformer, namely an alternating current ammeter is bypassed, and the alternating current ammeter cannot normally display the short-circuit power channel;
when the TA secondary circuit of the current transformer is in an open circuit state, the open circuit protection module of the current transformer has two working states of an alternating current positive half cycle and an alternating current negative half cycle:
1) during the positive alternating current half cycle, a first anode T1 pole and a second anode T2 pole of the bidirectional thyristor K meet forward bias, once the open-circuit voltage value of the secondary side of the current transformer is greater than the sum of the highest reverse voltage of the voltage regulator diode DZ1, the current limiting resistor R1, the current limiting resistor R2 and the forward conduction voltage of the voltage regulator diode DZ2, forward bias is generated between a control pole G pole of the bidirectional thyristor K and the second anode T2 pole, and at the moment, the bidirectional thyristor K is rapidly conducted in the positive alternating current half cycle;
2) during the negative half cycle of alternating current, the positive bias is satisfied between the second anode T2 pole and the first anode T1 pole of the triac K, once the open-circuit voltage value of the secondary side of the current transformer is greater than the sum of the highest reverse voltage of the zener diode DZ2, the current limiting resistor R1, the current limiting resistor R2 and the forward conduction voltage of the zener diode DZ1, the positive bias is generated between the control pole G pole of the triac K and the first anode T1 pole, and at this time, the triac K is rapidly conducted during the negative half cycle of alternating current.
Claims (1)
1. An open-circuit protection module of a current transformer is characterized by comprising a bidirectional thyristor K, a voltage stabilizing diode DZ1, a voltage stabilizing diode DZ2, a current limiting resistor R1 and a current limiting resistor R2; the first anode T1 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ1, the connecting end is used for connecting one end of the secondary side of the current transformer, the second anode T2 of the bidirectional thyristor K is connected with the cathode of the voltage stabilizing diode DZ2, the connecting end is used for connecting the other end of the secondary side of the current transformer, the anode of the voltage stabilizing diode DZ1 is connected with one end of a current limiting resistor R1, the anode of the voltage stabilizing diode DZ2 is connected with one end of a current limiting resistor R2, and the other end of the current limiting resistor R1 is connected with the other end of a current limiting resistor R2 and the control electrode G of the bidirectional thyristor K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120661103.8U CN214479567U (en) | 2021-04-01 | 2021-04-01 | Open circuit protection module for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120661103.8U CN214479567U (en) | 2021-04-01 | 2021-04-01 | Open circuit protection module for current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214479567U true CN214479567U (en) | 2021-10-22 |
Family
ID=78176788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120661103.8U Expired - Fee Related CN214479567U (en) | 2021-04-01 | 2021-04-01 | Open circuit protection module for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214479567U (en) |
-
2021
- 2021-04-01 CN CN202120661103.8U patent/CN214479567U/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 |
Granted publication date: 20211022 |
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| CF01 | Termination of patent right due to non-payment of annual fee |