CN213753970U - Self-energy-taking driving circuit for secondary open circuit protection of current transformer - Google Patents
Self-energy-taking driving circuit for secondary open circuit protection of current transformer Download PDFInfo
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- CN213753970U CN213753970U CN202022824248.3U CN202022824248U CN213753970U CN 213753970 U CN213753970 U CN 213753970U CN 202022824248 U CN202022824248 U CN 202022824248U CN 213753970 U CN213753970 U CN 213753970U
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Abstract
The utility model discloses a drive circuit that can certainly for protection is opened a way to current transformer secondary, including voltage energy-taking module, current energy-taking module, energy storage module and drive module, voltage energy-taking module and current energy-taking module all with energy storage module's electric energy input end links to each other, energy storage module's electric energy output with drive module links to each other, voltage energy-taking module is arranged in obtaining DC voltage from current transformer's secondary circuit, current energy-taking module is arranged in obtaining DC voltage from current transformer's secondary circuit coupling energy, energy storage module is used for saving and right the electric energy that voltage energy-taking module and current energy-taking module obtained drive module provides working power supply, drive module is used for when secondary circuit opens a way drive protection actuating mechanism protection circuit system. The method realizes all-weather monitoring and protection on whether the secondary side of the current transformer is open-circuited, and the whole process does not need manual intervention.
Description
Technical Field
The utility model relates to power equipment technical field, concretely relates to a drive circuit that can oneself that is used for current transformer secondary open circuit protection.
Background
The current transformer is one of the common devices used in power supply, plays a crucial role in the power supply process, and is mainly used for protection and measurement. The current transformer enables the secondary side to be strictly forbidden to be open in the using process, and the secondary side is open and has the following hazards: the secondary side of the current transformer is open-circuited, and then the current on the primary side of the current transformer is all used for excitation, so that the iron core of the current transformer is seriously saturated, the alternating magnetic flux induces extremely high voltage on the coil on the secondary side, and the peak value of the alternating magnetic flux can reach thousands of volts or even tens of thousands of volts, so that serious harm can be brought, such as: contact accidents, burning out of current transformers, differential protection or zero sequence current protection are misbehaving due to unbalanced currents, etc., and therefore, secondary side open circuits of the current transformers need to be monitored and effectively protected.
However, when monitoring and protecting the secondary side of the circuit transformer in the prior art, an additional power supply or an additional wiring power supply is needed, and the disadvantages are as follows: the power supply is additionally arranged, so that the later maintenance is required frequently, the labor cost is increased, and the monitoring and the protection of the secondary side cannot be realized in the maintenance period; and the additional wiring power supply on the secondary side increases contact points and contact resistance, so that the secondary cable wiring is complex, and once the secondary side is open-circuited, the secondary cable can not work normally, and all-weather monitoring and protection can not be realized.
Disclosure of Invention
The utility model aims at providing a from drive circuit that can get that is used for current transformer secondary open circuit protection to realize protecting circuit transformer secondary side in all weather.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a from drive circuit that can gain energy for current transformer secondary open circuit protection which the key lies in: including voltage energy-taking module, current energy-taking module, energy storage module and drive module, voltage energy-taking module and current energy-taking module all with the electric energy input end of energy storage module links to each other, the electric energy output of energy storage module with drive module links to each other, voltage energy-taking module is arranged in obtaining DC voltage from current transformer's secondary circuit, current energy-taking module is arranged in obtaining DC voltage from current transformer's secondary circuit coupling energy, energy storage module is arranged in storing and right the electric energy that voltage energy-taking module and current energy-taking module obtained drive module provides working power supply, drive module is used for when the secondary circuit opens a way drive protection actuating mechanism protection circuitry.
Furthermore, the voltage energy-taking module comprises a rectifier bridge D6, a positive input end and a negative input end of the rectifier bridge D6 are respectively connected with two secondary ends of the current transformer after being connected with the capacitor C3 and the capacitor C4 in series, and an output end of the rectifier bridge D6 is connected with an electric energy input end of the energy storage module.
Furthermore, the current energy-taking module energy-taking transformer CT2 and the rectifier bridge D7, the energy-taking transformer CT2 is coupled with the secondary circuit of the current transformer, two ends of the secondary side of the energy-taking transformer CT2 are respectively connected to the positive input end and the negative input end of the rectifier bridge D7, and the output end of the rectifier bridge D7 is connected with the electric energy input end of the energy storage module.
Further, the energy storage module comprises a super capacitor C5, the anode of the super capacitor C5 is connected with the output ends of the voltage energy taking module and the current energy taking module, and the cathode of the super capacitor C5 is grounded.
Further, the driving module includes a driving chip U5 and a transient suppression diode D5, a power input end of the driving chip U5 is connected to an electric energy output end of the energy storage module, a first driving output end and a second driving output end of the driving chip U5 are connected to the protection executing mechanism, and the transient suppression diode D5 is connected between the first driving output end and the second driving output end of the driving chip U5.
Furthermore, the voltage energy-taking module and the current energy-taking module are also connected with a power supply end of the driving module.
The utility model discloses a show the effect and be: because current transformer in use, its secondary circuit probably has the current and does not have the voltage, have states such as voltage and not have the current, the utility model discloses a voltage is got can and two kinds of modes of getting can are got to the current for no matter what state current transformer's secondary circuit is in, all can acquire the energy and supply power for drive module, guaranteed that drive module can both have working power supply in any state, ensured that it can normally work all the time, and then can realize whether open a way and monitor the protection to current transformer's secondary side in all weather, whole process need not artificial intervention moreover, help saving human cost and resource.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a self-energy-taking driving circuit for secondary open-circuit protection of a current transformer comprises a voltage energy-taking module, a current energy-taking module, an energy storage module and a driving module, the voltage energy-taking module and the current energy-taking module are both connected with the electric energy input end of the energy storage module, the electric energy output end of the energy storage module is connected with the driving module, the voltage energy taking module is used for obtaining direct current voltage from a secondary loop of the current transformer, the current energy-taking module is used for coupling energy from a secondary loop of the current transformer to obtain direct-current voltage, the energy storage module is used for storing the electric energy obtained by the voltage energy-taking module and the current energy-taking module and providing a working power supply for the driving module, the driving module is used for driving the protection actuating mechanism to protect the circuit system in a short circuit, open circuit or analog load connection mode when the secondary circuit is open.
In the specific implementation process of the embodiment, the voltage energy-taking module and the current energy-taking module are also connected with the power supply end of the driving module, so that the driving module can be directly powered after the voltage energy-taking module and the current energy-taking module take electricity, redundant electric energy is stored through the energy storage module, and when electric quantity obtained by the voltage energy-taking module and the current energy-taking module cannot normally power the driving module, the driving module is powered by discharging electricity of the energy storage module, namely, the power supply mode of the driving module is enriched.
FIG. 2 is a detailed circuit schematic of an embodiment, wherein S1-in and S2-in are connected to secondary corresponding terminals of a current transformer, and S1-out and S2-out are connected to a secondary load of the current transformer. As shown in fig. 2, the voltage energy-taking module includes a rectifier bridge D6, a positive input end and a negative input end of the rectifier bridge D6 are respectively connected in series with a capacitor C3 and a capacitor C4 and then connected with two secondary ends of the current transformer, and an output end of the rectifier bridge D6 is connected with an electric energy input end of the energy storage module. A voltage energy acquisition module is formed by the capacitor C3, the capacitor C4 and the rectifier bridge D6, the capacitor C3 and the capacitor C4 can obtain energy in a mode of acquiring voltage signals from a secondary circuit of the current transformer, and then direct current voltage is output to charge the energy storage module after rectification by the rectifier bridge D6, and meanwhile, electric energy can be provided for the driving module.
Referring to fig. 2, the energy-taking transformer CT2 of the current energy-taking module is coupled with the rectifier bridge D7, the energy-taking transformer CT2 is coupled with the secondary circuit of the current transformer, two ends of the secondary side of the energy-taking transformer CT2 are respectively connected to the positive input end and the negative input end of the rectifier bridge D7, and the output end of the rectifier bridge D7 is connected with the electric energy input end of the energy storage module. Through the current energy-taking module with the structure, the energy-taking mutual inductor CT2 can couple energy from a secondary circuit of the current mutual inductor, and then outputs direct-current voltage to charge the energy storage module after being rectified by the rectifier bridge D7, and meanwhile, the energy-taking mutual inductor can provide electric energy for the driving module.
In this example, the energy storage module includes a super capacitor C5, an anode of the super capacitor C5 is connected to the output ends of the voltage energy-taking module and the current energy-taking module, a cathode of the super capacitor C5 is grounded, and a voltage stabilizing diode D8 is connected in series between the anode and the cathode of the super capacitor C5 in the reverse direction. The super capacitor C5 can store the electric energy obtained by the voltage energy-obtaining module and the current energy-obtaining module, and provide the electric energy for the driving module, the voltage output by the super capacitor C5 can be basically kept unchanged through the voltage stabilizing diode D8, and the super capacitor C5 can be protected by being broken down and led into the ground through the voltage stabilizing diode D8 when high voltage or large current occurs.
As can also be seen from fig. 2, the driving module includes a driving chip U5 and a transient suppression diode D5, the protection actuator includes a relay J1, the first input IA and the second input IB of the driving chip U5 are connected to two driving signal outputs of the control unit, the first driving output OA and the second driving output OB of the driving chip U5 are connected to two ends of a coil winding of the relay J1, a switching portion of the relay J1 is connected to a secondary circuit of the current transformer, and the transient suppression diode D5 is connected between the first driving output OA and the second driving output OB of the driving chip U5. After the driving chip U5 receives the driving signal sent by the control unit, since the operating characteristic of the driving chip U5 outputs a high level, the relay J1 is powered on to operate, and short circuit, short circuit or load access is performed on the secondary circuit of the current transformer, so as to protect the secondary circuit.
Furthermore, the switch part of the relay J1 comprises a common contact, a normally closed contact and a normally open contact, the common contact and the normally closed contact are connected into a secondary circuit of the current transformer, and the normally open contact is grounded after being connected in series with an analog load R10. When a secondary circuit of the current transformer is normal, a common contact of a switch part of the relay J1 is conducted with the normally closed contact; when a secondary circuit of the current transformer is in an open circuit, the control unit sends a driving signal to the power driving unit, the power driving unit enables a coil winding of the relay J1 to be electrified to work, a common contact and a normally open contact of a switch part of the relay J1 are conducted, and an analog load R10 close to a load resistance value is connected into the secondary circuit, namely the analog load is connected when the secondary circuit is in the open circuit, so that the protection of the open circuit of the secondary circuit is realized. Of course, the switching portion of the relay J1 can be adaptively selected for the purpose of secondary circuit breaking or shorting in the specific implementation.
In this example, the rectifier bridge D4, the rectifier bridge D6 and the rectifier bridge D7 in the current sampling unit all adopt DB107 patch rectifiers.
In this embodiment, a voltage energy-taking module is formed by the capacitor C3, the capacitor C4 and the rectifier bridge D6, a current energy-taking module is formed by the energy-taking transformer CT2 and the rectifier bridge D7, the energy storage module formed by the super capacitor C5 stores energy obtained by the voltage energy-taking circuit and the current energy-taking circuit, and the voltage output by the super capacitor C5 can be basically kept unchanged by the zener diode D8, and the super capacitor C5 can be protected.
Because the current transformer is in use, the secondary circuit of the current transformer can be in states of current, voltage, current and the like, the embodiment adopts two energy obtaining modes of current and voltage, so that no matter what state the secondary circuit of the current transformer is in, energy can be obtained to supply power for the driving module, the driving module can be ensured to have a working power supply in any state, the normal work all the time of the driving module is ensured, and the all-weather monitoring and protection on whether the secondary side of the current transformer is open or not can be realized.
The technical scheme provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (6)
1. A self-energy-taking driving circuit for secondary open circuit protection of a current transformer is characterized in that: including voltage energy-taking module, current energy-taking module, energy storage module and drive module, voltage energy-taking module and current energy-taking module all with the electric energy input end of energy storage module links to each other, the electric energy output of energy storage module with drive module links to each other, voltage energy-taking module is arranged in obtaining DC voltage from current transformer's secondary circuit, current energy-taking module is arranged in obtaining DC voltage from current transformer's secondary circuit coupling energy, energy storage module is arranged in storing and right the electric energy that voltage energy-taking module and current energy-taking module obtained drive module provides working power supply, drive module is used for when the secondary circuit opens a way drive protection actuating mechanism protection circuitry.
2. The self-energizing drive circuit for secondary open circuit protection of a current transformer according to claim 1, wherein: the voltage energy-taking module comprises a rectifier bridge D6, a positive input end and a negative input end of the rectifier bridge D6 are respectively connected with two secondary ends of the current transformer after being connected with the capacitor C3 and the capacitor C4 in series, and an output end of the rectifier bridge D6 is connected with an electric energy input end of the energy storage module.
3. The self-energizing drive circuit for secondary open circuit protection of a current transformer according to claim 1, wherein: the energy-taking transformer CT2 and the rectifier bridge D7 of the current energy-taking module are coupled, the energy-taking transformer CT2 is coupled with a secondary circuit of the current transformer, two ends of the secondary side of the energy-taking transformer CT2 are respectively connected to the positive input end and the negative input end of the rectifier bridge D7, and the output end of the rectifier bridge D7 is connected with the electric energy input end of the energy storage module.
4. The self-energizing drive circuit for secondary open circuit protection of a current transformer according to claim 1, wherein: the energy storage module comprises a super capacitor C5, the anode of the super capacitor C5 is connected with the output ends of the voltage energy taking module and the current energy taking module, and the cathode of the super capacitor C5 is grounded.
5. The self-energizing drive circuit for secondary open circuit protection of a current transformer according to claim 1, wherein: the driving module comprises a driving chip U5 and a transient suppression diode D5, a power input end of the driving chip U5 is connected with an electric energy output end of the energy storage module, a first driving output end and a second driving output end of the driving chip U5 are connected with the protection executing mechanism, and the transient suppression diode D5 is connected between the first driving output end and the second driving output end of the driving chip U5.
6. The self-powered driving circuit for secondary open circuit protection of a current transformer according to any one of claims 1 to 5, wherein: the voltage energy-taking module and the current energy-taking module are also connected with a power supply end of the driving module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022824248.3U CN213753970U (en) | 2020-11-30 | 2020-11-30 | Self-energy-taking driving circuit for secondary open circuit protection of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022824248.3U CN213753970U (en) | 2020-11-30 | 2020-11-30 | Self-energy-taking driving circuit for secondary open circuit protection of current transformer |
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| Publication Number | Publication Date |
|---|---|
| CN213753970U true CN213753970U (en) | 2021-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022824248.3U Active CN213753970U (en) | 2020-11-30 | 2020-11-30 | Self-energy-taking driving circuit for secondary open circuit protection of current transformer |
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| CN (1) | CN213753970U (en) |
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- 2020-11-30 CN CN202022824248.3U patent/CN213753970U/en active Active
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