CN105738852A - Tandem type open circuit-preventing current burden box - Google Patents
Tandem type open circuit-preventing current burden box Download PDFInfo
- Publication number
- CN105738852A CN105738852A CN201610222218.0A CN201610222218A CN105738852A CN 105738852 A CN105738852 A CN 105738852A CN 201610222218 A CN201610222218 A CN 201610222218A CN 105738852 A CN105738852 A CN 105738852A
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- load
- test
- current transformer
- burden box
- switch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention discloses a tandem type open circuit-preventing current burden box which comprises a first output end, a second output terminal, and a plurality of groups of loads serially connected between the first output end and the second output end in order. Each group of loads is connected to a switch in parallel and includes a resistor and an inductor which are connected in series. The burden box can be controlled to realize a plurality of different load values by opening and closing the switches. The open circuit state of the burden box will not appear when any one switch is opened and closed. The state that a current transformer secondary load is turned off will not be generated in an operation process, and a secondary load can be switched in the current transformer test state. The test time is saved. The test workload is reduced. The current transformer work time due to the test is reduced, and the test risk is lowered. At the same time, a load superposing mode is adopted to improve the use efficiency of the single load. The number of components is greatly reduced, and the material cost is reduced.
Description
Technical field
The present invention relates to a kind of current capacity case, be specifically related to a kind of anti-open-circuit current Burden box of tandem, belong to current transformer technical field of measurement and test.
Background technology
Current transformer error information in band unequally loaded situation differs, substantially linearly change, in order to guarantee current transformer band, in different loads situation, error information is all in error limit, and when current transformer carries out error checking, needs carry 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, realizing typically by 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 in the process of movement, 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, it is likely to produce high voltage and damages current transformer or testing equipment, even threaten personal safety.
Summary of the invention
Present invention is primarily targeted at and overcome the defect of prior art to provide a kind of anti-open-circuit current Burden box of tandem, the state not having turn-off current transformer secondary load in operation produces, prevent the device damage because misoperation causes Current Transformer Secondary open circuit to bring and personal injury, 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, the technical solution adopted in the present invention is:
The anti-open-circuit current Burden box of tandem, 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.
The anti-open-circuit current Burden box of aforesaid tandem, 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 1.25VA, 2.5VA, 5VA, 10VA, 20VA, 40VA respectively, and power factor is 0.8.
The method have the advantages that
(1) traditional type current capacity case needs 14 groups of inductance, resistance and switch to realize 14 kinds of different loads, the anti-open-circuit current Burden box of tandem of the present invention only realizes 64 kinds of loads with 6 groups of inductance, resistance and switch, components and parts are less, load value is more, adopt load stacked system, improve the service efficiency of single load, greatly reduce component number, save material cost.
(2) traditional type current capacity case is by a load gear switch to another load gear process, current capacity case is in off state, make secondary loop of mutual inductor open circuit, as operated in charged situation, produce high voltage most probably and damage current transformer or other testing equipments, even threaten personal safety；The anti-open-circuit current Burden box of tandem of the present invention, the opening and closing of any one switch, 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 the anti-open-circuit current Burden box of tandem of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
A kind of anti-open-circuit current Burden box of tandem, 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.Switch on by control and close, it is possible to composition load range is 0 ~ 78.75VA, and minimum step value is 64 kinds of different loads of 1.25VA, fully meet 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 the anti-open-circuit current Burden box of tandem of the present invention 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, it is possible to prevent secondary circuit under current transformer trystate to be in device damage and the personal injury that open-circuit condition brings；Available electric current rises and does full-load test, utilizes electric current to decline and does light duty test, reduce test period, improves work efficiency；Decreasing the current transformer working time at the trial, thus decreasing the damage of equipment in current transformer error check system, reducing empirical risk.
The anti-open-circuit current Burden box of tandem of the present invention 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 when 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 because switch fault causes.
Described in summary, present configuration is simple, it is easy to accomplish, less costly, have a good application prospect.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (2)
1. the anti-open-circuit current Burden box of tandem, 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.
2. the anti-open-circuit current Burden box of tandem according to claim 1, 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 1.25VA, 2.5VA, 5VA, 10VA, 20VA, 40VA respectively, and power factor is 0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610222218.0A CN105738852A (en) | 2016-04-11 | 2016-04-11 | Tandem type open circuit-preventing current burden box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610222218.0A CN105738852A (en) | 2016-04-11 | 2016-04-11 | Tandem type open circuit-preventing current burden box |
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| Publication Number | Publication Date |
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| CN105738852A true CN105738852A (en) | 2016-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201610222218.0A Pending CN105738852A (en) | 2016-04-11 | 2016-04-11 | Tandem type open circuit-preventing current burden box |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997036A (en) * | 2017-05-24 | 2017-08-01 | 国家电网公司 | The non-critical point high-precision measuring load device of vertical cut formula under trystate |
| CN109667779A (en) * | 2017-10-17 | 2019-04-23 | 翰昂汽车零部件有限公司 | Air blower adjuster |
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| GB804915A (en) * | 1955-03-25 | 1958-11-26 | Metra Blansko | Apparatus for testing current or voltage transformers |
| JPH11142459A (en) * | 1997-11-07 | 1999-05-28 | Soken Denki Kk | Transformer error testing device with zero load function |
| CN101625924A (en) * | 2009-05-14 | 2010-01-13 | 河南电力试验研究院 | Voltage transformer simulation load box |
| CN202471947U (en) * | 2012-03-12 | 2012-10-03 | 江西省电力科学研究院 | General electrodeless automatic adjustment current transformer secondary load box |
| CN102931719A (en) * | 2011-08-11 | 2013-02-13 | 无锡华润上华科技有限公司 | System for switching power supplies without disconnecting bus from power supplies |
| CN203310934U (en) * | 2013-05-27 | 2013-11-27 | 国家电网公司 | Universal tandem-type current load box |
| CN204791722U (en) * | 2015-07-21 | 2015-11-18 | 国网技术学院 | Voltage transformer case of loading for training |
| CN105263220A (en) * | 2015-10-15 | 2016-01-20 | 大连交通大学 | Analog load cabinet of airport navigational light dimmer |
| CN205562783U (en) * | 2016-04-11 | 2016-09-07 | 江苏方天电力技术有限公司 | Open circuit current load case is prevented to serial -type |
-
2016
- 2016-04-11 CN CN201610222218.0A patent/CN105738852A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB804915A (en) * | 1955-03-25 | 1958-11-26 | Metra Blansko | Apparatus for testing current or voltage transformers |
| JPH11142459A (en) * | 1997-11-07 | 1999-05-28 | Soken Denki Kk | Transformer error testing device with zero load function |
| CN101625924A (en) * | 2009-05-14 | 2010-01-13 | 河南电力试验研究院 | Voltage transformer simulation load box |
| CN102931719A (en) * | 2011-08-11 | 2013-02-13 | 无锡华润上华科技有限公司 | System for switching power supplies without disconnecting bus from power supplies |
| CN202471947U (en) * | 2012-03-12 | 2012-10-03 | 江西省电力科学研究院 | General electrodeless automatic adjustment current transformer secondary load box |
| CN203310934U (en) * | 2013-05-27 | 2013-11-27 | 国家电网公司 | Universal tandem-type current load box |
| CN204791722U (en) * | 2015-07-21 | 2015-11-18 | 国网技术学院 | Voltage transformer case of loading for training |
| CN105263220A (en) * | 2015-10-15 | 2016-01-20 | 大连交通大学 | Analog load cabinet of airport navigational light dimmer |
| CN205562783U (en) * | 2016-04-11 | 2016-09-07 | 江苏方天电力技术有限公司 | Open circuit current load case is prevented to serial -type |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106997036A (en) * | 2017-05-24 | 2017-08-01 | 国家电网公司 | The non-critical point high-precision measuring load device of vertical cut formula under trystate |
| CN106997036B (en) * | 2017-05-24 | 2023-09-22 | 国家电网公司 | Load device for direct-cutting non-gateway high-precision metering under test state |
| CN109667779A (en) * | 2017-10-17 | 2019-04-23 | 翰昂汽车零部件有限公司 | Air blower adjuster |
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Application publication date: 20160706 |
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