CN204130426U - Current transformer ratio switching device shifter in a kind of primary cut-out - Google Patents
Current transformer ratio switching device shifter in a kind of primary cut-out Download PDFInfo
- Publication number
- CN204130426U CN204130426U CN201420455671.2U CN201420455671U CN204130426U CN 204130426 U CN204130426 U CN 204130426U CN 201420455671 U CN201420455671 U CN 201420455671U CN 204130426 U CN204130426 U CN 204130426U
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- China
- Prior art keywords
- change over
- over switch
- tap
- current
- terminal
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Abstract
The utility model discloses current transformer ratio switching device shifter in a kind of primary cut-out, its method comprises using and is electrically connected in by each tap of primary cut-out internal current instrument transformer secondary the protection definite value switching circuit that each contact of change over switch and current-release coil form; Also comprise the second open circuit protective loop avoiding increasing because each tap changing of current transformer is opened a way instantaneously.The utility model solves in correlation technique the mode adopting power failure, changes by adjustment binding post the method that current transformer tap realizes the switching of protection definite value.Simple by change over switch switch protecting valued methods, primary cut-out can be realized when not having a power failure, exempting from dismounting, ensure that the handling safety of staff.
Description
Technical field
The utility model relates to electric field, current transformer ratio switching device shifter in especially a kind of primary cut-out.
Background technology
In electric power system, be applied in branch's primary cut-out of 6 ~ 10kV distribution line, be mainly used in carrying out control and scheduling co-design to branched line load.Because it is installed on the electric pole of high nearly 3 meters usually; like this when branched line institute on-load changes; when reaching a threshold value; unlikely malfunction or tripping is protected for making it; carry out switching the adjustment realizing protection definite value to the no-load voltage ratio of current transformer in primary cut-out with regard to needing; namely adjusted by the tap of the current transformer to primary cut-out inside, reach the object changing Current Transformer Secondary output current size.Be in course of adjustment as the fail safe of guarantee operation; need when line outage; adopt and manually step on bar; after primary cut-out being disassembled with crane; the tap changing protective current transformer, in primary cut-out is gone again by another work post electric specialty personnel; to carry out the switching adjustment protecting definite value, and then primary cut-out is lifted by crane again, primary connection is installed.The mode of this adjustment definite value, not only inconvenient operation, and the danger and the workload that increase attendant, have impact on the continuity of power supply, and cause certain influence to the production of user, life.
For the method for the change current transformer ratio that do not have a power failure adopted in correlation technique, as " 10kV and above high-tension current inductor change ER effect ratio under no cut-off condition " that application number is 02151731.2, it is only applicable to the tap of high-tension current inductor secondary and is shielded to away from second protection in the control room of high-tension current inductor by cable leading; And need to access shorting stub in the process of change current transformer ratio, remove the method for shorting stub after having changed again. temporarilyBut the method cannot be applicable to the primary cut-out be arranged on electric pole and change current transformer ratio on the spot, therefore need a kind of current transformer in primary cut-out on electric pole power failure no-load voltage ratio fast adjustment method, to solve the problem.
utility model content
The purpose of this utility model is to provide current transformer ratio switching device shifter in a kind of primary cut-out, to solve in correlation technique the change current transformer ratio that do not have a power failure, not to be suitable on electric pole the quick-adjustsing problem of current transformer ratio in primary cut-out.Operating personnel can be made to utilize action bars station on the ground, primary cut-out protection definite value can be realized and not have a power failure rapid adjustment.
Current transformer ratio switching device shifter in a kind of primary cut-out described in the utility model; comprise and there is third gear handoff functionality, and can utilize with " U " type operating head insulating bar just second open circuit protective loop of increasing because each tap changing of current transformer is opened a way instantaneously of operable change over switch, current transformer ratio switching circuit and avoiding.
Comprise the insulating bar (3) utilized with " U " type operating head, make it rotarily drive change over switch (2) to switch between 1 ~ 3 grade, thus make primary cut-out on electric pole (1) internal current instrument transformer CTA, CTC bis-each three taps A1, A2, A3 and C1, C2, C3 and current-release loop A TQ, CTQ composition protection definite value switching circuit; Avoid the second open circuit protective loop increased because each tap changing of current transformer is opened a way instantaneously.
Further, change over switch adopts third gear three to save coaxial-type change over switch, often saves fixed contact pedestal and is assembled in insulation shell, and has 4 binding posts to draw; Moving contact is the tactile bridge of double breaking points dock, is arranged in the rotating shaft with handle, is threaded to diverse location the two binding post loops often saved on fixed contact pedestal are switched on or switched off with rotating shaft.
Further, current transformer ratio switching circuit comprises third gear three and saves coaxial-type change over switch
~
number terminal is electrically connected in the output of the different tap of Current Transmit A, CTC, for the no-load voltage ratio of the change switch current instrument transformer according to load.
Further, Current Transformer Secondary open-circuit-protection loop, is connected across on Current Transmit A tap A1 and A3 by piezo-resistance RPS1; Piezo-resistance RPS2 is connected across on Current Transmit C tap C1 and C3, and wherein A1, C1 end is connected with earth terminal E after connecting.
Further, the insulating bar with " U " type operating head is adopted to operate when no-load voltage ratio switches, the third gear three be arranged on by the insertion of " U " type operating head in the primary cut-out on electric pole saves exposing of coaxial-type change over switch and changes on handle, move switch by rotating insulated action bars band to switch between 1 ~ 3 grade, realize the switching of current transformer ratio.
Compared with prior art the invention has the advantages that: do not need to have a power failure, do not need to pull down primary cut-out on electric pole, can realize the quick switching of no-load voltage ratio, ensure that the continuity of powering to load, method of operation is simple, safety, operating efficiency significantly improves.
accompanying drawing explanation
Fig. 1 is the utility model primary cut-out no-load voltage ratio handover operation schematic diagram.
Fig. 2 is change-over switch arrangement schematic diagram.
Fig. 3 is the utility model no-load voltage ratio commutation circuit figure.
Fig. 4 is change over switch truth table.
embodiment
Below in conjunction with accompanying drawing in detail the present invention is described in detail, see Fig. 1 to Fig. 4, the primary cut-out 1 no-load voltage ratio changing method that do not have a power failure have employed third gear three and saves coaxial-type change over switch 2, it is installed vertically in high-voltage breaker operation mechanism case, and it is downward to make it change handle, under exposing to mechanism case base plate, its structure as shown in Figure 2, each gear has two pair of wire connection terminals to connect as shown in Figure 4 respectively, and connects with "×" representative.The each binding post of change over switch 2 constitutes definite value adjustment loop by Current Transmit A, CTC of primary cut-out 1 inside each three taps A1, A2, A3 and C1, C2, C3 as shown in Figure 3 and current-release loop A TQ, CTQ.Its concrete mode of connection is, the tap A2 of Current Transmit A is connected on the terminal of change over switch (SA) 2
the terminal of upper and change over switch (SA) 2
inner Constitution a pair can disjunction contact; Tap A1 is connected on the terminal of change over switch (SA) 2
the terminal of upper and change over switch (SA) 2
inner Constitution a pair can disjunction contact; Tap A3 is connected on the terminal of change over switch (SA) 2
the terminal of upper and change over switch (SA) 2
inner Constitution a pair can disjunction contact; The terminal of change over switch (SA) 2
,
,
with the one end being connected on current-release loop A TQ after shorting stub short circuit, the other end is connected with earth terminal E.The tap C2 of Current Transmit C is connected on the terminal of change over switch (SA) 2
the terminal of upper and change over switch (SA) 2
inner Constitution a pair can disjunction contact; Tap C1 is connected on the terminal of change over switch (SA) 2
the terminal of upper and change over switch (SA) 2
inner Constitution a pair can disjunction contact; Tap C3 is connected on the terminal of change over switch (SA) 2
the terminal of upper and change over switch (SA) 2
inner Constitution a pair can disjunction contact; The terminal of change over switch (SA) 2
,
,
with the one end being connected on current-release coil CTQ after shorting stub short circuit, the other end is connected with earth terminal E.
Third gear three saves the truth table of coaxial-type change over switch 2 as shown in Figure 4, change over switch (SA) 22 grades time, terminal
with
, terminal
with
connect; 1 grade time, terminal
with
, terminal
with
connect; 3 grades time, terminal
with
, terminal
with
connect.
The protective loop of Current Transmit A is connected across on tap A1 and the A3 of Current Transmit A by piezo-resistance RPS1, and wherein A1 end is connected with earth terminal E; The protective loop of Current Transmit C is connected across on tap C1 and the C3 of Current Transmit A by piezo-resistance RPS2, and wherein C1 end is connected with earth terminal E.
When switching no-load voltage ratio, operating personnel can utilize the insulating bar 3 with " U " type operating head, the exposing of three grade of three joint coaxial-type change over switch 2 of being inserted by " U " type operating head in the on-pole switch 1 be arranged on electric pole 4 is changed on handle, moves switch 2 switch between 1 ~ 3 grade by rotating insulated action bars 3 band.When supposing that on electric pole, primary cut-out 1 runs, change over switch (SA) 2 on 2 grades, its terminal
with terminal
, terminal
with terminal
connect, tap A2, C2 of its internal current instrument transformer CTA, CTC are connected in protective loop.When primary cut-out on electric pole 1 because load increases, when original current-release definite value cannot meet the demands, when the tap C2 of the tap A2 of Current Transmit A and Current Transmit C need be adjusted to current transformer tap A3 and C3 simultaneously, namely by insulating bar 3 rotary sampling switch (SA) 2 with " U " type operating head, it is made to switch to 3 grades, at this moment 2 grades of terminals of change over switch (SA) 2
with
, terminal
with
disconnect, 3 grades of terminals
with
, terminal
with
connect, thus complete the quick switching of no-load voltage ratio.Simultaneously for avoid Current Transmit A in handoff procedure tap A1 and A3 between; Tap C1 and the C3 of Current Transmit C produces overvoltage because of instantaneous open circuit; piezo-resistance RPS1 and RPS2 serves restriction to this overvoltage; achieve the real-time guard of current circuit, thus ensure that the potential hazard that the overvoltage occurred in operating process is brought the person and equipment.
The utility model does not describe part in detail, is the known technology of those skilled in the art of the present technique.
Claims (5)
1. current transformer ratio switching device shifter in a primary cut-out, comprise the insulating bar (3) utilized with " U " type operating head, make it rotarily drive change over switch (2) to switch between 1 ~ 3 grade, thus make primary cut-out on electric pole (1) internal current instrument transformer CTA, CTC bis-each three taps A1, A2, A3 and C1, C2, C3 and current-release loop A TQ, CTQ composition protection definite value switching circuit; Avoid the second open circuit protective loop increased because each tap changing of current transformer is opened a way instantaneously.
2. current transformer ratio switching device shifter in a kind of primary cut-out according to claims 1, is characterized in that, described change over switch (2) adopts third gear three to save coaxial-type change over switch; Second open circuit protective loop is made up of piezo-resistance RPS1, RPS2.
3. current transformer ratio switching device shifter in a kind of primary cut-out according to claims 1, it is characterized in that, utilize the insulating bar (3) with " U " type operating head, the third gear three insertion of " U " type operating head be arranged in the primary cut-out (1) on electric pole (4) saves exposing of coaxial-type change over switch (2) and changes on handle, moves switch (2) switch between 1 ~ 3 grade by rotating insulated action bars (3) band.
4. current transformer ratio switching device shifter in a kind of primary cut-out according to claims 1 or 2, is characterized in that, described Current Transmit A bis-tap A2 are connected on the terminal of change over switch (2)
on, tap A1 is connected on the terminal of change over switch (2)
on, tap A3 is connected on the terminal of change over switch (2)
on, Current Transmit C bis-tap C2 are connected on the terminal of change over switch (2)
on, tap C1 is connected on the terminal of change over switch (2)
on, tap C3 is connected on the terminal of change over switch (2)
on; The terminal of change over switch (2)
,
,
with the one end being connected on current-release loop A TQ after shorting stub short circuit; The terminal of change over switch (2)
,
,
with the one end being connected on current-release coil CTQ after shorting stub short circuit; Be connected with earth terminal E after the other end connection of ATQ and CTQ.
5. current transformer ratio switching device shifter in a kind of primary cut-out according to claims 3, is characterized in that, Current Transmit A second protection loop is connected across on tap A1 and A3 by piezo-resistance RPS1; Current Transmit C second protection loop is connected across on tap C1 and C3 by piezo-resistance RPS2, and wherein A1, C1 end is connected with earth terminal E after connecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420455671.2U CN204130426U (en) | 2014-08-13 | 2014-08-13 | Current transformer ratio switching device shifter in a kind of primary cut-out |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420455671.2U CN204130426U (en) | 2014-08-13 | 2014-08-13 | Current transformer ratio switching device shifter in a kind of primary cut-out |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204130426U true CN204130426U (en) | 2015-01-28 |
Family
ID=52386755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420455671.2U Expired - Fee Related CN204130426U (en) | 2014-08-13 | 2014-08-13 | Current transformer ratio switching device shifter in a kind of primary cut-out |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204130426U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113707441A (en) * | 2021-08-13 | 2021-11-26 | 国网河北省电力有限公司检修分公司 | Adjustable transformation ratio CT wiring terminal capable of preventing open circuit in uninterrupted state |
-
2014
- 2014-08-13 CN CN201420455671.2U patent/CN204130426U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113707441A (en) * | 2021-08-13 | 2021-11-26 | 国网河北省电力有限公司检修分公司 | Adjustable transformation ratio CT wiring terminal capable of preventing open circuit in uninterrupted state |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20150813 |
|
| EXPY | Termination of patent right or utility model |