CN205562783U - Open circuit current load case is prevented to serial -type - Google Patents
Open circuit current load case is prevented to serial -type Download PDFInfo
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- CN205562783U CN205562783U CN201620294813.0U CN201620294813U CN205562783U CN 205562783 U CN205562783 U CN 205562783U CN 201620294813 U CN201620294813 U CN 201620294813U CN 205562783 U CN205562783 U CN 205562783U
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- 230000033228 biological regulation Effects 0.000 description 3
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Abstract
The utility model discloses an open circuit current load case is prevented to serial -type, including first output, second output and establish ties in proper order a plurality of groups load between the two, parallelly connected switch of every group load, every group load is all including the resistance and the inductance of establishing ties, opening and be closed through the switch, the load case can be controlled and the load value of multiple difference is realized, opening and the closure of any one switch, the load case switching -off state can not appear, the state that can not have disconnection current transformer secondary load in operation process produces, can switch over secondary load under current transformer test condition, test time has been saved, the experiment work volume has been reduced, the current transformer because of experimental work time is shortened, the empirical risk has been reduced, and simultaneously, adopt load transfer mode, the efficiency of the use of single load is improved, components and parts quantity has significantly reduced, the material saving cost.
Description
Technical field
This utility model relates to a kind of current capacity case, is specifically related to a kind of tandem anti-open-circuit current Burden box, belongs to current transformer technical field of measurement and test.
Background technology
Current transformer error information in the case of band different loads differs, the most linearly change, in order to guarantee current transformer band, in the case of different loads, error information is all in error limit, and when current transformer carries out error checking, needs are carried out under current transformer band rated load and lower limit condition.JJG1021-2007 " electric power mutual-inductor " vertification regulation, JJG313-2010 " Verification of Measuring Current Transformer " vertification regulation all have regulation, when current transformer error is measured, need to access load in tested secondary winding in current transformer, generally realizing with current capacity case, current capacity case needs to use lower limited load shelves and rated load shelves two grades in use.
A kind of conventional current Burden box as shown in Figure 1, it is made up of 14 groups of inductance, resistance and switch, constitutes 14 kinds of different loads that load value is 0VA, 2.5VA, 5VA, 6.25VA, 7.5VA, 10VA, 12.5VA, 15VA, 20VA, 25VA, 30VA, 40VA, 50VA, 60VA that power factor is 0.8.When cutting-off switch contact S and K1 contact is connected, the load value of current capacity case is 2.5VA, and when cutting-off switch contact S connects in K2 contact, the load value of current capacity case is 3.75VA ... when cutting-off switch contact S and K14 contact is connected, the load value of current capacity case is 60VA.Current capacity case is when by a load switching to another load, and cutting-off switch contact S needs to move to another contact from a contact, and during moving, current capacity case is in off state.
Above-mentioned conventional current Burden box, because internal structure reason can cause open circuit of secondary loop of current transformer when switchable load gear, so can not directly switch its Burden box load value under current transformer test mode, need to switch again after primary current back to zero, otherwise current transformer there will be in test primary circuit the situation of electric current secondary loop open circuit open circuit, high voltage may be produced and damage current transformer or testing equipment, even threaten personal safety.
Utility model content
Main purpose of the present utility model is to overcome the defect of prior art to provide a kind of tandem anti-open-circuit current Burden box, the state the most not having turn-off current transformer secondary load produces, prevent the device damage and personal injury causing Current Transformer Secondary open circuit to bring because of misoperation, and secondary load can be switched under current transformer trystate, save test period, reduce experiment work amount, shorten the time that current transformer works because of test, reduce empirical risk.
In order to achieve the above object, this utility model be the technical scheme is that
Tandem anti-open-circuit current Burden box, it is characterised in that include the first outfan, the second outfan and be sequentially connected in series some groups of loads between；A described often group load switch in parallel；Described often group load all includes resistance and the inductance of series connection.
Aforesaid tandem anti-open-circuit current Burden box, it is characterized in that, being connected on the load between the first outfan and the second outfan is six groups, first group of load, second group of load, the 3rd group of load, the 4th group of load, the 5th group of load and the 6th group of load successively, load value is respectively 1.25VA, 2.5VA, 5VA, 10VA, 20VA, 40VA, and power factor is 0.8.
This utility model has the advantages that
(1) traditional type current capacity case needs 14 groups of inductance, resistance and switch to realize 14 kinds of different loads, tandem of the present utility model anti-open-circuit current Burden box only realizes 64 kinds of loads with 6 groups of inductance, resistance and switch, components and parts are less, load value is more, use load stacked system, improve the service efficiency of single load, greatly reduce component number, save material cost.
(2) during traditional type current capacity case is by a load gear switch to another load gear, current capacity case is in off state, make secondary loop of mutual inductor open circuit, as operated in the case of charged, produce high voltage most probably and damage current transformer or other testing equipments, even threaten personal safety；Tandem of the present utility model anti-open-circuit current Burden box, what any one switched opens and closes, Burden box is all without off state occur, the state that will not have turn-off current transformer secondary load in operation produces, secondary load can be switched under current transformer trystate, save test period, reduce experiment work amount, shorten the time that current transformer works because of test, reduce empirical risk.
Accompanying drawing explanation
Fig. 1 is traditional current capacity case circuit theory diagrams.
Fig. 2 is the circuit theory diagrams of tandem of the present utility model anti-open-circuit current Burden box.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is further described.Following example are only used for clearly illustrating the technical solution of the utility model, and can not limit protection domain of the present utility model with this.
A kind of tandem anti-open-circuit current Burden box, circuit theory is as in figure 2 it is shown, include the first output terminals A, the second outfan B and be connected on resistance R1 between the two, inductance L1, resistance R2, inductance L2, resistance R3, inductance L3, resistance R4, inductance L4, resistance R5, inductance L5, resistance R6, inductance L6.Resistance R1 constitutes, with inductance L5, resistance R6 and inductance L6, six groups of loads that power factor is 0.8 with inductance L4, resistance R5 with inductance L3, resistance R4 with inductance L2, resistance R3 with inductance L1, resistance R2, load value is followed successively by 1.25VA, 2.5VA, 5VA, 10VA, 20VA, 40VA, often a group load switch in parallel, is followed successively by K1, K2, K3, K4, K5, K6.Being switched on by control and close, may be constructed load range is 0 ~ 78.75VA, and minimum step value is 64 kinds of different loads of 1.25VA, fully meets current transformer error verification demand.
The implementation of several load value illustrated below:
When switch all closes, 6 groups of resistance-inductance are all shorted, and load value is 0VA；
K1 opens, and when rest switch all closes, load value is 1.25VA；
K2 opens, and when rest switch all closes, load value is 2.5VA；
K1, K2 open, and when rest switch all closes, load value is 3.75VA；
K3 opens, and when rest switch all closes, load value is 5VA；
K1, K3 open, and when rest switch all closes, load value is 6.25VA；
K2, K3 open, and when rest switch all closes, load value is 7.5VA；
K1, K2, K3 open, when rest switch all closes, for 8.75VA；
K4 opens, when rest switch all closes, and 10VA；
……
K2K3K4K5K6 all opens, and during K1 Guan Bi, load value is 77.5VA；
When all switches are all opened, load value is 78.5VA.
When using this utility model tandem anti-open-circuit current Burden box to carry out current transformer error verification test, current transformer can the gear of switchable load case at the test condition, do not have open circuit, be possible to prevent secondary circuit under current transformer trystate to be in device damage and the personal injury that open-circuit condition brings；Full-load test is done in available electric current rising, utilizes electric current to decline and does light duty test, reduce test period, improves work efficiency；Decrease the current transformer working time at the trial, thus decrease the damage of equipment in current transformer error check system, reduce empirical risk.
Tandem of the present utility model anti-open-circuit current Burden box only needs 6 groups of resistance, inductance and 6 switches to can be achieved with 0VA～78.75VA totally 64 kinds of different load values, component number is decreased in the case of increasing load capacity scope and gear number, save material cost, only need 6 groups of switches to can be achieved with the switching of 64 gears simultaneously, decrease number of switches, reduce the equipment failure rate caused because of switch fault.
Summary is described, this utility model simple in construction, it is easy to accomplish, cost is relatively low, has a good application prospect.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; on the premise of without departing from this utility model know-why; can also make some improvement and deformation, these improve and deformation also should be regarded as protection domain of the present utility model.
Claims (2)
1. tandem anti-open-circuit current Burden box, it is characterised in that include the first outfan, the second outfan and be sequentially connected in series some groups of loads between；A described often group load switch in parallel；Described often group load all includes resistance and the inductance of series connection.
Tandem the most according to claim 1 anti-open-circuit current Burden box, it is characterized in that, being connected on the load between the first outfan and the second outfan is six groups, first group of load, second group of load, the 3rd group of load, the 4th group of load, the 5th group of load and the 6th group of load successively, load value is respectively 1.25VA, 2.5VA, 5VA, 10VA, 20VA, 40VA, and power factor is 0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620294813.0U CN205562783U (en) | 2016-04-11 | 2016-04-11 | Open circuit current load case is prevented to serial -type |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620294813.0U CN205562783U (en) | 2016-04-11 | 2016-04-11 | Open circuit current load case is prevented to serial -type |
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| CN205562783U true CN205562783U (en) | 2016-09-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738852A (en) * | 2016-04-11 | 2016-07-06 | 江苏方天电力技术有限公司 | Tandem type open circuit-preventing current burden box |
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2016
- 2016-04-11 CN CN201620294813.0U patent/CN205562783U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738852A (en) * | 2016-04-11 | 2016-07-06 | 江苏方天电力技术有限公司 | Tandem type open circuit-preventing current burden box |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 211100 Jiangsu city of Nanjing province Jiangning Tianyuan Science Park Road No. 19 Co-patentee after: Wuhan pan electric Polytron Technologies Inc Patentee after: Jiangsu Fangtian Power Technology Co., Ltd. Co-patentee after: STATE GRID JIANGSU ELECTRIC POWER COMPANY Co-patentee after: State Grid Corporation of China Address before: 211100 Jiangsu city of Nanjing province Jiangning Tianyuan Science Park Road No. 19 Co-patentee before: Wuhan Pandian Technology Co., Ltd. Patentee before: Jiangsu Fangtian Power Technology Co., Ltd. Co-patentee before: STATE GRID JIANGSU ELECTRIC POWER COMPANY Co-patentee before: State Grid Corporation of China |
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| CP01 | Change in the name or title of a patent holder |