CN217282209U - Open circuit protection device for current transformer - Google Patents
Open circuit protection device for current transformer Download PDFInfo
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- CN217282209U CN217282209U CN202122333093.8U CN202122333093U CN217282209U CN 217282209 U CN217282209 U CN 217282209U CN 202122333093 U CN202122333093 U CN 202122333093U CN 217282209 U CN217282209 U CN 217282209U
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Abstract
The utility model discloses a current transformer open circuit protection device, which comprises a shell, wherein a control panel is arranged inside the shell, two connecting wires are arranged on the shell, and the end parts of the connecting wires are provided with connecting terminals; be provided with two field effect transistors on the control panel, detection circuitry, two transient suppression diodes, energy storage filter capacitor and drive circuit, the drain electrode and the source electrode of two series field effect transistors are connected respectively to the connecting wire, source electrode and drain electrode ground connection of two field effect transistor series connections, be connected with drive circuit after two field effect transistor's grid is connected, the connecting wire is connected respectively to two transient suppression diode's positive pole, connect test circuit's one end after two transient suppression diode's negative pole is connected, test circuit's the other end passes through energy storage filter capacitor ground connection, drive circuit's input is connected between test circuit and energy storage filter capacitor. The utility model discloses can effectually restrain the current transformer secondary side and produce dangerous high voltage, protect personal and equipment safety.
Description
Technical Field
The utility model relates to an electric power system protection technical field, especially a current transformer open circuit protection device.
Background
In an electric power system, the secondary side of a current transformer is strictly forbidden to be open-circuited in operation, and the secondary open-circuit of the current transformer usually brings the following hazards: 1) the secondary side of the current transformer is open-circuited, so that the voltage on a secondary coil can be increased to thousands of volts or even tens of thousands of volts, and the safety of people and equipment can be seriously threatened; 2) the loss of the iron core of the current transformer is increased, the iron core is easy to generate heat seriously, an iron core insulating layer is burnt out, and the transformer is damaged; 3) the iron core is saturated, so that the error of the transformer is increased, and the metering accuracy of the current transformer is influenced;
4) when a secondary circuit of the current transformer is opened, the ammeter indicates abnormal, the current monitoring function is lost, the relay protection device cannot work normally, the protection fails, the abnormal operation of the main circuit is monitored, and serious consequences can be caused if the abnormal operation is not processed in time.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides a current transformer protection device that opens a way, effectively restraines current transformer secondary side high voltage, protects the person and equipment safety.
In order to solve the technical problem, the utility model adopts the following technical proposal.
The open-circuit protection device for the current transformer comprises a shell, wherein a control panel for performing open-circuit protection on the current transformer is arranged in the shell, two connecting wires for connecting the control panel are arranged on the shell, and connecting terminals for connecting two ends of the current transformer are arranged at the end parts of the connecting wires; be provided with two field effect transistors on the control panel, a detection circuitry for detecting current transformer both ends voltage, two are used for control circuit to switch on and cut off the transient suppression diode that holds the energy, an energy storage filter capacitor and a drive circuit for carrying out charge-discharge, two series field effect transistor's drain electrode and source electrode are connected respectively to the connecting wire, two field effect transistor series connection's source electrode and drain electrode ground connection, be connected with drive circuit after two field effect transistor's grid is connected, the connecting wire is connected respectively to two transient suppression diode's positive pole, connect test circuit's one end behind two transient suppression diode's negative pole connection, test circuit's the other end passes through energy storage filter capacitor ground connection, drive circuit's input is connected between test circuit and energy storage filter capacitor.
In the open-circuit protection device for the current transformer, the field effect tube adopts an HY3810B field effect tube.
In the open-circuit protection device for the current transformer, the detection circuit is a TVS tube of SMBJ30 CA.
In the open-circuit protection device for the current transformer, the transient suppression diode is a UF4005 Schottky fast recovery transient suppression diode.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model discloses can open a way or when primary current overflows unusually at current transformer, current transformer opens a way protection device and switches on automatically, can produce dangerous high voltage by effectual suppression current transformer secondary side, the protection person and equipment safety.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a circuit diagram of the control panel according to the present invention.
Wherein: 1. the cable comprises a shell, 2 parts of connecting wires and 3 parts of connecting terminals.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The open circuit protection device for the current transformer is structurally shown in fig. 1 and comprises a shell 1, a control panel is arranged inside the shell 1, a connecting wire 2 connected with the control panel is arranged on the shell 1, and a connecting terminal 3 connected with two ends of the current transformer is arranged at the end part of the connecting wire 2.
The control panel is provided with a field effect transistor, a detection circuit, a transient suppression diode, an energy storage filter capacitor and a driving circuit, and the circuit diagram of the control panel is shown in figure 2.
The field effect tube sets up to two, and the field effect tube adopts HY3810B field effect tube, two field effect tube series connection, and the drain electrode and the source electrode of two series field effect tubes are connected the connecting wire 2 respectively, connect current transformer's both ends, and the source electrode and the drain electrode ground connection of two field effect tube series connection, the grid of two field effect tubes is connected the back and is connected with drive circuit, and drive circuit is used for driving switching on and closing of field effect tube, and when current transformer both ends voltage was too high, the field effect tube switched on.
The two transient suppression diodes are used for controlling the conduction, the cut-off and the energy storage of the circuit, the UF4005 Schottky fast recovery transient suppression diodes are adopted as the transient suppression diodes, the anodes of the two transient suppression diodes are respectively connected with the connecting wire 2, the cathodes of the two transient suppression diodes are connected with one end of the test circuit, the other end of the test circuit is grounded through the energy storage filter capacitor, and the input end of the driving circuit is connected between the test circuit and the energy storage filter capacitor.
The detection circuit is the TVS pipe of SMBJ30CA for detect the voltage at current transformer both ends, works when 33V, and when the voltage at current transformer both ends was greater than 33V, the TVS pipe switched on.
The energy storage filter capacitor is used for charging and discharging, when the TVS tube is conducted, the voltage at two ends of the connecting wire is approximately zero, the voltage detection and driving circuit works by the internal energy storage filter capacitor, and after a period of time, an instantaneous circuit charging and discharging process of 4-5ms is carried out at two ends of the protection device, namely energy storage.
When the current transformer is opened or the primary current is abnormal, when the secondary side voltage of the current transformer is greater than 33V, the TVS tube of the detection circuit is conducted, the voltages at two ends of the connecting wire are approximately zero, the energy storage filter capacitor works for voltage drop detection and driving circuits, the field effect tube is conducted, the open-circuit protection device is automatically conducted, dangerous high voltage can be effectively generated on the secondary side of the current transformer, and personal and equipment safety is protected.
Claims (4)
1. Current transformer open circuit protection device, its characterized in that: the current transformer open-circuit protection device comprises a shell (1), wherein a control panel for performing open-circuit protection on the current transformer is arranged in the shell (1), two connecting wires (2) connected with the control panel are arranged on the shell (1), and connecting terminals (3) for connecting two ends of the current transformer are arranged at the end parts of the connecting wires; be provided with two field effect transistors on the control panel, a detection circuitry for detecting current transformer both ends voltage, two transient suppression diodes that are used for control circuit to switch on and cut off the energy storage, an energy storage filter capacitor and a drive circuit for carrying out charge-discharge, the drain electrode and the source electrode of two series field effect transistors are connected respectively to connecting wire (2), source electrode and drain electrode ground connection of two field effect transistor series connections, be connected with drive circuit behind the grid connection of two field effect transistors, the connecting wire is connected respectively to the positive pole of two transient suppression diodes, connect test circuit's one end behind the negative pole connection of two transient suppression diodes, test circuit's the other end passes through energy storage filter capacitor ground connection, drive circuit's input is connected between test circuit and energy storage filter capacitor.
2. The open circuit protection device for a current transformer according to claim 1, wherein: the field effect transistor adopts an HY3810B field effect transistor.
3. The open circuit protection device for a current transformer according to claim 1, wherein: the detection circuit is a TVS tube of SMBJ30 CA.
4. The open circuit protection device for a current transformer according to claim 1, wherein: the transient suppression diode is a UF4005 Schottky fast recovery transient suppression diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122333093.8U CN217282209U (en) | 2021-09-26 | 2021-09-26 | Open circuit protection device for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122333093.8U CN217282209U (en) | 2021-09-26 | 2021-09-26 | Open circuit protection device for current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217282209U true CN217282209U (en) | 2022-08-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122333093.8U Active CN217282209U (en) | 2021-09-26 | 2021-09-26 | Open circuit protection device for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217282209U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117117805A (en) * | 2023-08-23 | 2023-11-24 | 广东开放大学（广东理工职业学院） | Open-circuit protection method for current transformer |
-
2021
- 2021-09-26 CN CN202122333093.8U patent/CN217282209U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117117805A (en) * | 2023-08-23 | 2023-11-24 | 广东开放大学（广东理工职业学院） | Open-circuit protection method for current transformer |
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