CN106353551A - Combined current terminal with functions of indication and open circuit prevention - Google Patents
Combined current terminal with functions of indication and open circuit prevention Download PDFInfo
- Publication number
- CN106353551A CN106353551A CN201610783728.5A CN201610783728A CN106353551A CN 106353551 A CN106353551 A CN 106353551A CN 201610783728 A CN201610783728 A CN 201610783728A CN 106353551 A CN106353551 A CN 106353551A
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- core
- electric wire
- energy
- open
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A combined current terminal with functions of indication and open circuit prevention comprises a current transmitting component, a connecting part and a current passage component, wherein the current transmitting component comprises a first current transmitting line and a second current transmitting line parallel to the first current transmitting line, a first core and a second core are arranged at one end of the first current transmitting line and one end of the second current transmitting line, a first crimping plate and a second crimping plate are arranged in the two parallel cores, one end of each of the two crimping plates is connected with the inner sides of the two cores, the other ends of the two crimping plates are connected with one end of a first return spring and one end of a second return spring respectively, the other ends of the two return springs are connected with an indication mechanism, and a first energy storage spring and a second energy storage spring are arranged between the middle section of the first crimping plate and the first core and between the second crimping plate and the second core respectively. The problems that the cores are too hot and even a sensor is burnt due to the fact that excitation magnetic potential surges due to open circuit of the secondary side of a current transformer under the non-normal condition can be solved.
Description
Technical field
The present invention is the design with instruction combination type anti-open-circuit current terminal, is related to power system Current Transformer Secondary letter
Number fields of measurement.
Background technology
Current transformer principle is made according to transformer principle.Current transformer is by the iron core closing and winding group
Become.Seldom, in needing the circuit of electric current of measurement, therefore it often has whole electricity of circuit to string to its first side winding number of turn
Stream flows through, and secondary side winding turn ratio is more, is serially connected in measuring instrumentss and protective loop, current transformer operationally, it
Secondary side circuit all the time be closure, the therefore impedance very little of measuring instrumentss and protective loop series coil, current transformer
Working condition close to short circuit.Current transformer is that primary side high current is converted into secondary side small current to measure.
Because Current Transformer Secondary lateral load is all little resistive coil, its secondary side is close under short-circuit condition
Work.According to magnetic potential balance formula: i1n1-i2n2=i0n1Understand, due to i1n1The overwhelming majority is by i2n2Offset, so total magnetic
Kinetic potential i0n1Very little, i.e. exciting curent i0Very little, only primary current i1A few percent.If secondary side is opened a way, i2=0,
There is i1n1=i0n1, i.e. i1=i0, i1It is primary circuit load current, not because transformer secondary load changes, now exciting curent
For i1, tens times of excitation magnetic potential sharp increase, it is unshakable in one's determination overheated that this will lead to, or even burn sensor, because the Secondary Winding number of turn is a lot,
The high voltage crisis person inducing and equipment safety.In operation Current Transformer Secondary side open circuit may have following phenomenon and after
Really:
1. due to magnetic flux saturation in iron core, produce thousands of volt high pressure in secondary side, open circuit point is likely to occur electric discharge phenomena, produce
Raw discharge spark and discharging sound；
2., due to magnetic flux saturation in iron core, cause loss to increase and generate heat, damage insulation, have allophone abnormal flavour；
3. the ammeter instruction being connected with current transformer is played pendulum or is not indicated, kilowatt-hour meter rotating speed is abnormal；
4. produce high voltage and threaten the person and equipment safety；
5. iron core heating, or even burn insulation；
6. measure inaccurate, even if having repaired secondary circuit, due to remanent magnetism, the accuracy of metering will also decrease；
7. ammeter instruction is abnormal.
Content of the invention
The technical problem to be solved is for above-mentioned the deficiencies in the prior art, and a kind of band instruction group providing
Box-like anti-open-circuit current terminal, can solve open a way under the abnormal condition excitation magnetic potential that leads to of Current Transformer Secondary side acute
Increase so that iron core is overheated, or even the problem burning sensor.
The purpose of invention is achieved in that
A kind of band instruction combination type anti-open-circuit current terminal, it includes defeated stream unit, connector and is subject to stream unit, described
Defeated stream unit includes the second defeated stream electric wire that the first defeated stream electric wire and stream electric wire defeated with first be arranged in parallel, the first defeated stream electric wire
One end of stream electric wire defeated with second is provided with the first core and the second core, is provided with the first crimping in two cores being parallel to each other
Plate and the second crimping plate, one end of two crimping plates is connected with the inner side of both threads core respectively, and the other end of two crimping plates divides
In not multiple with the first spring in multiple and second, one end of spring is connected, two again middle springs the other end respectively with indicating mechanism
Connect, between the first crimping stage casing of plate and the first core and second crimp and be respectively equipped with first between plate and the second core
Energy-stored spring and the second energy-stored spring；
Described included first by stream unit and be subject to stream electric wire, second be subject to stream electric wire, the first short-circuit board and the second short-circuit board, the
One is subject to stream electric wire and second to be subject to one end of stream electric wire to be respectively equipped with the 3rd core and the 4th core, and first be subject to by stream electric wire and second
Stream electric wire is parallel to each other, and the first short-circuit board and the second short-circuit board include the first side plate and the first side plate respectively and be connected in 90 degree
With the second side plate in 90 degree of the 3rd side plates being connected, the first side plate length is less than the 3rd side plate length, the first short circuit to second side plate
First side plate of plate is connected with the 4th core, and the first side plate of the second short-circuit board is connected with the 3rd core, in the 4th core and
It is provided with u-shaped limiting plate, u-shaped limiting plate is respectively equipped with the 3rd storage respectively and the 3rd core and the 4th core between three cores
Energy spring and the 4th energy-stored spring, the 3rd energy-stored spring is provided with the first short circuit piece, and the 4th energy-stored spring is provided with the second short circuit
Piece, the 3rd energy-stored spring and the 4th energy-stored spring are fixedly connected with u-shaped limiting plate respectively in end.
Above-mentioned first core and the second core are arranged in the first terminal connecting groove.
Above-mentioned 3rd core and the 4th core are arranged in Second terminal connecting groove.
It is respectively equipped with the first alarm indicating mechanism and the second alarm instruction machine in the 3rd energy-stored spring and the 4th energy-stored spring
Structure, the first alarm indicating mechanism is ejected by upper end window, the second alarm indicating mechanism is ejected by lower end window.
Described indicating mechanism is to be connected with left sides window b chute；First short-circuit board and the second short-circuit board are welded on end
Son is internal.
It is the terminal shell with watch window on the left of described indicating mechanism, indicating mechanism scribbles red, green, red three layers for surface
The conductiving metal strip indicating.When loop does not open a way normal, indicating mechanism is placed in the middle, the normal bar of watch window display green；Open
Lu Shi, crimping strip is moved and is moved in indicating mechanism or move down, and watch window display red-fault bar connects.
Using said structure, following technique effect can be brought:
1) band instruction combination type anti-open-circuit current terminal.This current terminal comprises 3 critical pieces: defeated stream unit, is flowed
Part, connector.Three parts can be combined into the Current Transformer Secondary side current terminal of secondary electrical system use, according to
Position before and after in electric loop, is flexibly arranged in pairs or groups using different molectrons, occurs in circuit connection or screw terminal
Loosen, come off or because of during the non-wiring of human error, can be swift in motion by internal mechanism and excise trouble point, it is to avoid electric current
Transformer secondary side open circuit causes personnel equipment to injure, or the measurement misalignment that causes of loose contact and false protection.Meanwhile, this electricity
Stream terminal possesses secondary side open circuit point instruction function, facilitates trouble point to search and processes；
2) pass through defeated stream unit, combined by stream unit and its intermediate connector, Current Transformer Secondary can be substituted
Current terminal in measuring loop, defeated stream unit passes through different connected structures from by stream unit inside it, in circuit connection
Come in contact bad or come off, when terminal screw loosens, reliable action, excises fault loop, prevent current transformer rapidly
Secondary circuit open circuit is it is ensured that personnel and equipment safety；
3) defeated stream unit and by stream unit be standardization module, both can be used as rotating function in terminal by connection member makes
With it can also be used to need to access the measurement apparatus of Current Transformer Secondary signal, current measuring device is using same after this part
It is capable of preventing the defencive function of Current Transformer Secondary side open circuit, and have no effect on the survey of device body under normal circumstances
Accuracy of measurement；
4) either defeated stream unit is still subject to stream unit, when current transformer two side loop occurs open fault by the design
After described terminal isolation, current terminal body carries open-circuit-protection flag indicator, and indicator can characterize open-circuit current terminal
Actual act side, be easy to analysis and the process of fault.Meanwhile, as peripheral condition possesses, this signal indicator actuating signal energy
Send on enough；
5) completely using mechanical part, there is not the loop interference that string electricity or electromagnetism cause, send out in terminal itself in the design
It still is able in the case of raw exception that guarantee equipment is normal and personal security.In view of Current Transformer Secondary side loop open circuit is serious
Response after degree and fault occur requires, and band instruction combination type anti-open-circuit current terminal has and significantly uses advantage and push away
Wide value.
Brief description
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the overall normal structural representation running of the present invention；
Integrally structural representation during open fault for the present invention in Fig. 2；
Fig. 3 is defeated stream unit normal work internal structure schematic diagram in the present invention；
Fig. 4 is defeated stream unit open fault internal structure schematic diagram in the present invention；
Fig. 5 is to be subject to stream unit normal work internal structure schematic diagram in the present invention；
Fig. 6 is to be subject to stream unit open fault internal mechanism schematic diagram in the present invention.
Specific embodiment
In such as Fig. 1, consistent with common current terminal function, play the transfer interconnection function of signal.In fig. 2, with a phase
As a example illustrate.
1) defeated stream side fault, the inlet wire wiring of short circuit open phase；When secondary loop of mutual inductor a phase is to sensor as end
There is open circuit 1 fault, defeated stream unit mechanism action in connection terminal, realize short circuit 1, then open circuit 1 is isolated, Current Transformer Secondary
Side a phase still forms closed-loop path, sensor and the disappearance of end connection device a phase current thereafter, and front end and transformer body are normally transported
OK.
2) it is subject to stream side fault, short circuit is subject to stream side terminal；When secondary loop of mutual inductor a phase is to sensor al end connection end
There are open circuit 2 faults in son, by stream unit mechanism action, realize short circuit 2, then open circuit 2 is isolated, Current Transformer Secondary side a phase
Still form closed-loop path, only sensor body a phase current disappearance, front and back end and transformer body normally run.
3) as sensor body terminal occurs open fault, by as a example al terminals fault, realized by defeated stream unit
As and al short circuit after fault, then open circuit point be isolated, Current Transformer Secondary side a phase still forms closed-loop path, only sensor
Body a phase current lacks, and front and back end and transformer body normally run.
Defeated stream unit normal work and internal mechanism action during open fault as shown in Figure 3 and Figure 4；
1. be terminal connections groove between dotted line, between normal operating condition mechanism a, b, c, do not deposit electrical connection, energy-stored spring with
Crimping plate one, multiple middle spring all carries out insulation processing with energy-stored spring body and contact surface.
2. between crimping plate and defeated stream electric wire 1,2 cores, wiring is that (core side is head of commonly colding pressing to special head of colding pressing, crimping
Plate side is that special joint and core head of colding pressing realizes physical connection and electrically conducting), after crimping cable core with crimp plate a or c
Good conducting.
3., during normal operation, back-moving spring makes b be in interposition, crimping plate is between limiting plate and core, energy storage bullet
Spring is compressed.
4. when open fault occurs (so that defeated stream electric wire 1 loosens or comes off as a example, identical with electric wire 1 during electric wire 2 open circuit), defeated
Stream electric wire 1 core skids off from terminal connections groove, and the crimping plate that band is dynamically connected departs from limiting plate and limits, in the effect carrying energy-stored spring
It is subjected to displacement under power and connects with b and push, b moves under crimping plate energy-stored spring active force and connects as c crimping plate, now defeated
Stream electric wire 1,2 cores are removed by a, b, c short circuit, trouble point, and front-end devices and current transformer can normally run.
When moving to opening action position under 5.b, its lower end action instruction block exposes observation window, can interpolate that open-circuit-protection
Action.And monitoring system can will be delivered to by the binding post on a, c in warning signal.
6. (recover or compression wiring) after open fault is processed, in the presence of middle spring again, b automatically returns to middle position,
Defeated stream electric wire 1,2 electrical connection disconnects, and loop is recovered normal and run.
If Fig. 5 and Fig. 6 is by internal mechanism action when stream unit normal work and open fault；
1. normal operating condition is subject to not depositing electrical connection, energy-stored spring between stream electric wire 1,2 cores and short circuit piece, short-circuit board
Body and contact surface all carry out insulation processing.
2. (so that defeated stream electric wire 1 loosens or comes off as a example, identical with electric wire 1 during electric wire 2 open circuit), storage when open fault occurs
Can move in spring release, install and connect with the short circuit row to core 2 with the short-circuit board on spring, i.e. the terminal connections of core 1,2
Terminal is shorted, and it connects measuring cell loop current and is cut off, and the measuring loop of front and back end is unaffected, and current transformer is just
Often run.
3., when moving to opening action position on energy-stored spring when open fault occurs, its upper end action instruction block exposes observation
Window, can interpolate that open-circuit-protection action.By the binding post in short circuit piece and terminal connections groove, can be by alarm letter
Monitoring system is delivered on number.
4. (recover or compression wiring) after open fault is processed, energy-stored spring retraction under the effect of core pressure is initial
Position, defeated stream electric wire 1,2 electrical connection disconnects, and loop is recovered normal and run.
Connection member only carries out being electrically connected physically by defeated stream unit with by stream unit.Examination can be arranged on connector
Test slide block and binding post.Preferably, connection member is phoenix terminal, and wherein slide block electrically can connect by defeated stream end with by stream end
Connect or disconnect, special wiring terminal can be passed through in the test connection end at two ends, accesses test wire.
Claims (6)
1. a kind of band instruction combination type anti-open-circuit current terminal, it includes defeated stream unit, connector and is subject to stream unit, its feature
It is: described defeated stream unit includes the second defeated stream electricity that the first defeated stream electric wire (1) and stream electric wire (1) defeated with first be arranged in parallel
Line (2), one end of the first defeated stream electric wire (1) and the second defeated stream electric wire (2) is provided with the first core (3) and the second core (8), two
Be provided with the core that root is parallel to each other the first crimping plate (5) and second crimping plate (9), two crimping plates one end respectively with two
The inner side of core connects, spring (10) during the other end of two crimping plates is multiple with the first spring (6) in multiple and second respectively
One end connects, two multiple in the other end of springs is connected with indicating mechanism (7) respectively, in the stage casing of the first crimping plate (5) and the
It is respectively equipped with the first energy-stored spring (11) and second between one core (3) and between the second crimping plate (9) and the second core (8)
Energy-stored spring (12)；
Described by stream unit include first be subject to stream electric wire (13), second be subject to stream electric wire (14), the first short-circuit board (17) and second
Short-circuit board (18), first is subject to stream electric wire (13) and second to be subject to one end of stream electric wire (14) to be respectively equipped with the 3rd core (15) and the 4th
Core (16), first is subject to stream electric wire (13) and second to be subject to flow electric wire (14) and be parallel to each other, the first short-circuit board (17) and the second short circuit
Plate (18) is included the first side plate and the first side plate respectively and is connected in 90 degree with the second side plate in 90 degree of second side plates being connected
3rd side plate, the first side plate length is less than the 3rd side plate length, the first side plate of the first short-circuit board (17) and the 4th core (16)
Connect, the first side plate of the second short-circuit board (18) is connected with the 3rd core (15), in the 4th core (16) and the 3rd core (15)
Between be provided with u-shaped limiting plate (23), u-shaped limiting plate (23) respectively and the 3rd core (15) and the 4th core (16) between respectively
It is provided with the 3rd energy-stored spring (19) and the 4th energy-stored spring (20), the 3rd energy-stored spring (19) is provided with the first short circuit piece (21),
4th energy-stored spring (20) is provided with the second short circuit piece (22), and the 3rd energy-stored spring (19) and the 4th energy-stored spring (20) are in end
It is fixedly connected with u-shaped limiting plate (23) respectively.
2. according to claim 1 band instruction combination type anti-open-circuit current terminal it is characterised in that: described first core
(3) and the second core (8) is arranged in the first terminal connecting groove (4).
3. according to claim 1 band instruction combination type anti-open-circuit current terminal it is characterised in that: described 3rd core
(15) it is arranged in Second terminal connecting groove (24) with the 4th core (16).
4. according to claim 1 with instruction combination type anti-open-circuit current terminal Wiring detection method it is characterised in that:
It is respectively equipped with the first alarm indicating mechanism (25) in the 3rd energy-stored spring (19) and the 4th energy-stored spring (20) and the second alarm refers to
Show mechanism (26), upper end window ejection is passed through in the first alarm indicating mechanism (25), lower end is passed through in the second alarm indicating mechanism (26)
Window ejects.
5. according to claim 1 with instruction combination type anti-open-circuit current terminal Wiring detection method it is characterised in that:
Described indicating mechanism (7) is to be connected with left sides window b chute；First short-circuit board (17) and the second short-circuit board (18) are welded on
Terminal inner.
6. the Wiring detection method with instruction combination type anti-open-circuit current terminal according to claim 1 or 5, its feature exists
In: it is the terminal shell with watch window on the left of described indicating mechanism (7), indicating mechanism (7) scribbles red, green, red three for surface
The conductiving metal strip of layer instruction.When loop does not open a way normal, indicating mechanism is placed in the middle, the normal bar of watch window display green；
During open circuit, crimping strip is moved and is moved in indicating mechanism or move down, and watch window display red-fault bar connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610783728.5A CN106353551B (en) | 2016-08-31 | 2016-08-31 | Combined open-circuit-proof current terminal with indication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610783728.5A CN106353551B (en) | 2016-08-31 | 2016-08-31 | Combined open-circuit-proof current terminal with indication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106353551A true CN106353551A (en) | 2017-01-25 |
| CN106353551B CN106353551B (en) | 2023-03-21 |
Family
ID=57857571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610783728.5A Active CN106353551B (en) | 2016-08-31 | 2016-08-31 | Combined open-circuit-proof current terminal with indication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106353551B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008306783A (en) * | 2007-06-05 | 2008-12-18 | Toshiba Mitsubishi-Electric Industrial System Corp | Protective device for current transformer |
| CN201402859Y (en) * | 2009-04-17 | 2010-02-10 | 珠海许继电气有限公司 | CT open circuit preventing connector of outdoor trolly wire |
| CN202093972U (en) * | 2011-05-31 | 2011-12-28 | 郑州人造金刚石及制品工程技术研究中心有限公司 | Current transformer with open circuit protection indication |
| CN202695118U (en) * | 2012-07-17 | 2013-01-23 | 大厂回族自治县开元电力技术有限公司 | Novel open-type current transformer |
| CN206020505U (en) * | 2016-08-31 | 2017-03-15 | 中国长江电力股份有限公司 | A kind of band indicates the anti-open-circuit current terminal of combination type |
-
2016
- 2016-08-31 CN CN201610783728.5A patent/CN106353551B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008306783A (en) * | 2007-06-05 | 2008-12-18 | Toshiba Mitsubishi-Electric Industrial System Corp | Protective device for current transformer |
| CN201402859Y (en) * | 2009-04-17 | 2010-02-10 | 珠海许继电气有限公司 | CT open circuit preventing connector of outdoor trolly wire |
| CN202093972U (en) * | 2011-05-31 | 2011-12-28 | 郑州人造金刚石及制品工程技术研究中心有限公司 | Current transformer with open circuit protection indication |
| CN202695118U (en) * | 2012-07-17 | 2013-01-23 | 大厂回族自治县开元电力技术有限公司 | Novel open-type current transformer |
| CN206020505U (en) * | 2016-08-31 | 2017-03-15 | 中国长江电力股份有限公司 | A kind of band indicates the anti-open-circuit current terminal of combination type |
Non-Patent Citations (1)
| Title |
|---|
| 徐惜琼等: "电流互感器二次开路保护装置的应用分析和改进" * |
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| CN106353551B (en) | 2023-03-21 |
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