CN218412873U - Secondary current terminal for preventing open circuit in secondary test of CT (computed tomography) live circuit - Google Patents
Secondary current terminal for preventing open circuit in secondary test of CT (computed tomography) live circuit Download PDFInfo
- Publication number
- CN218412873U CN218412873U CN202222626747.0U CN202222626747U CN218412873U CN 218412873 U CN218412873 U CN 218412873U CN 202222626747 U CN202222626747 U CN 202222626747U CN 218412873 U CN218412873 U CN 218412873U
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- terminal
- secondary current
- current
- 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.)
- Active
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to the technical field of current terminals, in particular to a secondary current terminal for preventing open circuit in a secondary test of a CT (computed tomography) live circuit, which comprises a terminal main body, a terminal cover and a terminal cover, wherein the terminal main body is used for disconnecting and connecting a circuit; the metal wiring board is used for normally connecting a secondary wiring of a compaction current; and when the short-circuit wire is broken, connected in a virtual mode or detached in a wrong mode, the diode can be conducted rapidly. When the diode normally operates, the diode is short-circuited by the current terminal and cannot be conducted, and normal transmission of secondary current is not influenced. Corresponding devices are tested in a CT secondary current loop, and when a current terminal connecting sheet is opened, the diode cannot be conducted, so that the test accuracy and the CT secondary non-open circuit are guaranteed. When the short-circuit wire or the short-circuit wire is disconnected by mistake, the short-circuit wire is broken and virtual connection is broken to cause open circuit, the voltage at the two ends of the diode can be rapidly increased to reach the conduction voltage of the diode, and the diode is conducted at the moment, so that overvoltage is prevented from occurring in secondary current open circuit, and the safety of life and equipment is guaranteed.
Description
Technical Field
The utility model relates to a current terminal technical field, specifically speaking relates to a secondary current terminal that open a way is prevented in CT electrified loop secondary test.
Background
In the conventional secondary equipment maintenance and overhaul process, the situation of performing function verification or equipment fault treatment on equipment with different voltage levels and different types without power outage is usually encountered, for example, the uninterrupted power supply verification on a fault recording device, a traveling wave distance measuring device, a line protection device, a bus protection device, a measurement and control device and a metering device, and the conventional safety measure commonly used by professional maintainers is to short-circuit an external current transformer secondary current loop connected to a device to be inspected regularly by a short-circuit wire or a short-circuit connecting sheet and then open a current transformer secondary test terminal connecting sheet so as to ensure that the current transformer secondary loop cannot be opened and cause secondary loop overvoltage when the secondary test terminal connecting sheet is opened, thereby ensuring the personal safety of testers and the normal operation of operating equipment, and then adding current to the corresponding secondary equipment to be inspected regularly by a relay protection tester to perform the regular inspection and verification of the device.
However, when the device is subjected to a non-power-off test, the following disadvantages can be caused by using the traditional short-circuit wire:
1. because the short-circuit wire is welded, the condition that the short-circuit wire is connected and disconnected in a virtual mode can be formed after the short-circuit wire is used for long time and pulled by plugging and pulling for many times;
2. when the mental state of the tester is not good, the short-circuit wire is mistakenly detached under the condition that the short-circuit connecting piece is not recovered after the test;
when two kinds of circumstances more than taking place, all can cause in fact that current transformer secondary circuit outside is not got up by the short circuit, when opening current transformer secondary test terminal connection piece, causes current transformer secondary circuit to open a way, forms secondary circuit high voltage, causes harm to personal and equipment safety.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a secondary current terminal that open a way is prevented in CT electrified return circuit secondary test to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above purpose, the utility model provides a secondary current terminal for preventing open circuit in secondary test of a CT live circuit, which comprises a terminal main body, a terminal cover and a terminal cover, wherein the terminal main body is used for disconnecting and connecting the circuit;
the metal wiring board is used for normally connecting a secondary wiring of a compaction current;
the diode, when normal operating, the diode can not switch on, when the short circuit electric wire fracture, virtual connecing or mistake are torn open, the diode can switch on fast for prevent that secondary current return circuit from opening a way.
Preferably, a fixing buckle is mounted at the bottom of the terminal main body.
Preferably, the terminal body is provided with operation holes at both sides of the top thereof.
Preferably, the metal wiring board is in communication with the diode through a wiring.
Preferably, a wire pressing screw is installed at the top of the metal wiring plate, a threaded hole is formed in the top of the metal wiring plate, a wiring hole is formed in one side of the top of the metal wiring plate, an external wiring penetrates into the wiring hole, the wire pressing screw can be screwed into the threaded hole to compress the external wiring, a wiring end is installed at the bottom end of the metal wiring plate, and one end of the wiring is connected with the wiring end.
Preferably, a connecting piece is installed in the middle of the terminal main body and comprises a lower piece and an upper piece, the lower piece is welded on the terminal main body, the upper piece is detachably connected to the lower piece through a locking bolt, and the lower piece and the upper piece can be separated from each other to achieve disconnection of current.
Compared with the prior art, the beneficial effects of the utility model are that:
1. by additionally arranging the diode on the secondary current terminal, the diode cannot be conducted when the secondary current terminal operates normally, so that the normal transmission of the secondary current cannot be influenced.
2. When the CT secondary current loop is electrified to test a corresponding device, the diode is not conducted when the current terminal connecting sheet is opened, and the accuracy of the test and the CT secondary circuit are ensured not to be opened.
3. When the short-circuit wire is mistakenly detached or broken and connected in a virtual mode, the short-circuit wire is opened, the diode on the secondary current terminal developed through the achievement is conducted, and therefore secondary current is prevented from being opened, and safety of people and equipment is guaranteed.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural view of a metal wiring board in the present invention;
fig. 3 is a schematic structural view of the middle connecting piece of the present invention.
The various reference numbers in the figures mean:
1. a terminal main body; 11. an operation hole; 12. connecting a wire; 13. fixing the buckle; 14. a wire pressing screw; 2. a metal wiring board; 21. a wire connecting end; 22. a wire connecting hole; 23. a threaded hole; 3. a diode; 4. connecting sheets; 41. carrying out sheet discharging; 42. loading the sheet; 43. and locking the bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a secondary current terminal for preventing open circuit in secondary test of a CT electrified loop, as shown in figures 1-3, comprising a terminal main body 1 for disconnecting and connecting the circuit; the metal wiring board 2 is used for normally connecting a secondary wiring of a compaction current; the diode 3 is not conducted when the diode 3 normally operates, when a short-circuit wire is broken, connected in a virtual mode or detached mistakenly, the diode 3 can be conducted quickly and used for preventing a secondary current loop from being opened, and when the diode 3 normally operates, the diode 3 is not conducted, so that the accuracy of normal transmission and sampling of secondary current is not influenced;
when the power-off test is carried out, if the short-circuit wire is broken, connected in a virtual mode or disconnected by mistake, the short-circuit wire can be quickly conducted through the diode 3 in the secondary current terminal, so that the secondary current loop is prevented from being opened, high voltage is inhibited, and the safety of people and equipment is guaranteed; when the uninterrupted power supply is used for testing, the diode 3 in the secondary current terminal is not conducted due to the lower internal resistance of the device to be tested, so that an external current loop cannot be shunted, and the accuracy of the test is guaranteed; when the circuit works normally, the diode 3 is short-circuited by the short-circuit piece 4, so that the sampling precision in normal operation is not influenced.
In this embodiment, the bottom of the terminal body 1 is provided with the fixing buckle 13, which is consistent with national standards and can be fixed on the clamping groove.
Specifically, operation holes 11 are formed in two sides of the top of the terminal body 1, and when the multi-terminal is used in a combined mode, isolation of relevant equipment in a current loop can be achieved through short circuit of the operation holes 11.
Further, the metal wiring plate 2 is communicated with the diode 3 through a wiring 12.
Further, line ball screw 14 is installed at the top of metal wiring board 2, and the top of metal wiring board 2 is provided with screw hole 23, and top one side of metal wiring board 2 is provided with connects the electric wire hole 22, and outside power connection penetrates and connects electric wire hole 22, and line ball screw 14 can twist into screw hole 23 and compress tightly outside power connection, and power connection end 21 is installed to the bottom of metal wiring board 2, and the one end of power connection 12 is connected with power connection end 21.
It is worth noting that the achievement can be applied to secondary current loops of different voltage grades, different manufacturer equipment types and different specialties; the secondary current loop can be effectively prevented from being opened when the equipment function is checked or the equipment fault is processed without power failure, the accuracy of the test is not influenced, the personal safety of testers can be well guaranteed, and the method has the characteristics of strong application adaptability and high universality; the achievement can greatly reduce accidents caused by non-human reasons, accords with the consideration of a power grid company on safety, and has good popularization. The achievement is the same as the traditional secondary current terminal installation mode, and extra workload can not be caused.
Furthermore, the connecting piece 4 is installed in the middle of the terminal main body 1, the connecting piece 4 comprises a lower piece 41 and an upper piece 42, the lower piece 41 is welded on the terminal main body 1, the upper piece 42 is detachably connected to the lower piece 41 through a locking bolt 43, the lower piece 41 and the upper piece 42 can be separated from each other to realize the disconnection of current, and the disconnection and isolation of current can be realized during maintenance.
The utility model discloses a secondary current terminal of preventing opening a way of CT live line loop secondary test is when using, in order to prevent that the current transformer secondary circuit outside is not short-circuited, when opening the connection piece 4 of current transformer secondary test terminal, cause the current transformer secondary circuit to open a way, form secondary circuit high voltage, cause harm to personal and equipment safety, through install diode 3 additional on the secondary current terminal, in normal operating, this diode 3 can not switch on, thereby can not influence the normal transmission of secondary current;
when the CT secondary current loop is electrified to test a corresponding device, the diode 3 is not conducted when the current terminal connecting sheet 4 is opened, so that the test accuracy is ensured, and the CT secondary current loop is not opened; when the short-circuit wire is mistakenly disconnected or the short-circuit wire is broken and connected in a virtual mode to cause open circuit, the short-circuit wire can be conducted through the diode 3 on the secondary current terminal developed by the achievement, so that secondary current open circuit is prevented, and safety of people and equipment is guaranteed;
at first when waiting to detect the device normal operating, this achievement is every to be connected diode 3 and can not switch on to do not influence the accuracy of sampling, when not having a power failure test, if the short circuit electric wire fracture, virtual connection or mistake when tearing open can switch on through diode 3 in this secondary current terminal fast to prevent that the secondary current return circuit from opening a way, restrained the appearance of high voltage, ensured the safety of the person and equipment, increased one deck safety protection measure again for the experimenter in other words. When the uninterrupted power supply test is carried out, because the internal resistance of the detected device is low, the diode 3 in the secondary current terminal can not be conducted, so that an external current loop can not be shunted, and the test accuracy is guaranteed.
The foregoing shows and describes the basic principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only the preferred embodiments of the present invention, and is not intended to limit the present invention, and that there may be various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides a secondary current terminal that open circuit is prevented in electrified return circuit secondary test of CT which characterized in that: comprises that
A terminal body (1) for disconnecting and connecting an electric circuit;
the metal wiring board (2) is used for normally connecting a secondary wiring of a compaction current;
diode (3), normal operating, diode (3) can not switch on, when the short circuit electric wire fracture, virtual connecing or the mistake is torn open, diode (3) can switch on fast for prevent that secondary current return circuit from opening a way.
2. The secondary current terminal for preventing the open circuit in the secondary test of the CT live circuit according to claim 1, characterized in that: and a fixing buckle (13) is arranged at the bottom of the terminal main body (1).
3. The secondary current terminal for preventing the open circuit in the secondary test of the CT live circuit according to claim 1, characterized in that: and operation holes (11) are formed in two sides of the top of the terminal main body (1).
4. The secondary current terminal for preventing the open circuit in the secondary test of the CT live circuit according to claim 1, characterized in that: the metal wiring board (2) is communicated with the diode (3) through a wiring (12).
5. The secondary current terminal for preventing the open circuit in the secondary test of the CT live circuit according to claim 4, characterized in that: wire clip screw (14) are installed at the top of metal wiring board (2), the top that metal wiring board (2) connect is provided with screw hole (23), top one side that metal wiring board (2) connect is provided with connects wire hole (22), and outside wiring penetrates connects wire hole (22), wire clip screw (14) can twist into screw hole (23) and compress tightly outside wiring, wire connection end (21) are installed to the bottom that metal wiring board (2) connect, the one end and the wire connection end (21) of power connection (12) are connected.
6. The secondary current terminal for preventing the open circuit in the secondary test of the CT live circuit according to claim 1, characterized in that: the middle part of the terminal main body (1) is provided with a connecting piece (4), the connecting piece (4) comprises a lower piece (41) and an upper piece (42), the lower piece (41) is welded on the terminal main body (1), the upper piece (42) is detachably connected onto the lower piece (41) through a locking bolt (43), and the lower piece (41) and the upper piece (42) can be separated from each other to realize the disconnection of current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222626747.0U CN218412873U (en) | 2022-10-08 | 2022-10-08 | Secondary current terminal for preventing open circuit in secondary test of CT (computed tomography) live circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222626747.0U CN218412873U (en) | 2022-10-08 | 2022-10-08 | Secondary current terminal for preventing open circuit in secondary test of CT (computed tomography) live circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218412873U true CN218412873U (en) | 2023-01-31 |
Family
ID=84999425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222626747.0U Active CN218412873U (en) | 2022-10-08 | 2022-10-08 | Secondary current terminal for preventing open circuit in secondary test of CT (computed tomography) live circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218412873U (en) |
-
2022
- 2022-10-08 CN CN202222626747.0U patent/CN218412873U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111381158A (en) | Circuit breaker divide-shut brake coil real-time supervision device | |
| CN216013591U (en) | Multifunctional handcart switch control loop tester | |
| CN201327509Y (en) | High-voltage transmission line parameter measuring device and system thereof | |
| CN101403779B (en) | Parameter measuring apparatus and system for high tension power line | |
| CN218412873U (en) | Secondary current terminal for preventing open circuit in secondary test of CT (computed tomography) live circuit | |
| CN209342855U (en) | A kind of cable insulation status diagnostic device | |
| CN216696645U (en) | Device for judging operation condition of secondary circuit based on harmonic characteristics of current transformer | |
| CN207976549U (en) | A kind of suspension type power-supply controller of electric for high-voltage switch gear detection device | |
| CN205539078U (en) | Alternating current -direct current voltage secondary circuit and test test device and switching cardboard thereof | |
| CN213843405U (en) | Quick testing arrangement of transformer substation relay protection device | |
| CN2727747Y (en) | All-circuit self-checking AC high-voltage electroscope | |
| CN213093585U (en) | 400 volt bypass switch and nuclear phase current and voltage monitoring device | |
| CN202693726U (en) | Detection circuit and detection system for electric transmission and transformation equipment | |
| CN203166397U (en) | Circuit structure for eliminating induction voltage | |
| CN205941610U (en) | Main transformer bushing tap adapter | |
| CN107240885B (en) | Method for searching fault with non-corresponding background display position of double-bus isolating switch | |
| CN112510653A (en) | Bus differential protection device and online replacement and debugging method | |
| CN213843493U (en) | Transformer bushing live-line test sampling unit detection device and system | |
| CN113671233A (en) | Method for judging operation condition of secondary circuit based on harmonic characteristics of current transformer | |
| CN108680817A (en) | A kind of suspension type power-supply controller of electric | |
| CN202693725U (en) | Detection circuit and detection system for electric transmission and transformation equipment | |
| CN215910556U (en) | Electric shock prevention safety detection device for metering charged meter replacement | |
| CN111864559B (en) | 400-volt bypass switch and nuclear phase current and voltage monitoring device and application method | |
| CN215728405U (en) | Device for diagnosing operation state of secondary circuit of high-voltage current transformer | |
| CN219161592U (en) | Insulation protection and leakage monitoring device for engine vibration test board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |