CN207215874U - A kind of load box - Google Patents
A kind of load box Download PDFInfo
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- CN207215874U CN207215874U CN201721277792.2U CN201721277792U CN207215874U CN 207215874 U CN207215874 U CN 207215874U CN 201721277792 U CN201721277792 U CN 201721277792U CN 207215874 U CN207215874 U CN 207215874U
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- load box
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Abstract
The utility model, which is created, is related to antisurge testing field, more particularly to a kind of load box, load box takes direct current from the external world, make to produce pressure difference between positive bus-bar and negative busbar, differential pressure action, to produce load current, now switchs K12 closures on load resistance R11, artifical resistance R12 and load resistance R11 is in parallel, the resistance of load box output end diminishes, and the electric current of its output end rises sharply, so as to simulate the process that surge current rises sharply；Switch K12 disconnects after closing the of short duration time, now the electric current of load box output end drops back to original state, so as to simulate the process of surge current rapid drawdown, surge current is exported by analog DC motor, realize and substitute dc motor with load box to export surge current to switching device during antisurge is tested, avoid dc motor from being damaged；And the peak value of surge current can be simply adjusted by artifical resistance R12 change in resistance, test scope is extensive, practical.
Description
Technical field
The invention is related to antisurge testing field, more particularly to a kind of load box.
Background technology
Switching device often switches between disconnecting and closing two states, because electrical equipment is being switched to the mistake of closure from disconnection
Surge current is easily produced in journey, therefore it is required that switching device possesses very strong Surge handling capability.If switching device antisurge energy
Power is not strong, then it should not be allowed to be passed in the market, otherwise can endanger other equipment, therefore all needed to it before switching device dispatches from the factory
Carry out antisurge test.And common antisurge method of testing is controlled by PLC, direct DC becomes and swapped out on dc motor
Surge waveform, and surge waveform is exported to switching device, so as to test the performance of switching device.But this mode is due to direct current
Motor need to continually carry out DC conversion, cause dc motor to be easily damaged.
The content of the invention
The purpose of the invention is to avoid dc motor from being damaged during switching device antisurge is tested.
The purpose of the invention is achieved through the following technical solutions：
A kind of load box, including positive bus-bar, negative busbar and load resistance R11 be provided, load resistance R11 be connected on positive bus-bar and
To form the first load branch between negative busbar, in addition to switch K12 and resistance are less than load resistance R11 artifical resistance R12,
Artifical resistance R12 and switch K12 is in parallel with first load branch after connecting.
As a kind of preferable scheme, load box also includes switch K11, switch K21 and resistance different from the load resistance
R11 load resistance R21, switch K11 are serially connected on first load branch, are switched K21 and load resistance R21 series connection and are followed by
Between positive bus-bar and negative busbar, to form the second load branch.Preferably, load box also includes switch K22 and resistance is less than
The artifical resistance R22 of the load resistance R21, artifical resistance R22 and switch K22 series connection after with second load branch simultaneously
Connection.
The beneficial effect of the invention：
Load box takes direct current from the external world, makes to produce pressure difference between positive bus-bar and negative busbar, differential pressure action is in load resistance
R11 is upper to produce load current, and now controlling switch K12 is closed, and artifical resistance R12 and load resistance R11 are in parallel, and load box is defeated
The resistance for going out end diminishes, and the electric current of its output end rises sharply, so as to simulate the process that surge current rises sharply；It is of short duration to switch K12 closures
Disconnected after time, now the electric current of load box output end drops back to original state, so as to simulate the process of surge current rapid drawdown, passes through simulation
Dc motor exports surge current, realizes and substitutes dc motor with load box to export wave during antisurge is tested
Electric current is gushed to switching device, avoids dc motor from being damaged；And can simply it be adjusted by artifical resistance R12 change in resistance
The peak value of surge current, test scope is extensive, practical.
Brief description of the drawings
Innovation and creation are described further using accompanying drawing, but the embodiment in accompanying drawing does not form and the invention is appointed
What is limited, on the premise of not paying creative work, can also be according to the following drawings for one of ordinary skill in the art
Obtain other accompanying drawings.
Fig. 1 is the partial circuit diagram of the load box of the invention.
Embodiment
As shown in figure 1, positive bus-bar and negative busbar to obtain 120V direct currents from extraneous power supply, load resistance R11 series connection
Switch K1 is followed by between positive bus-bar and negative busbar, artifical resistance R12 tandem taps K12 be followed by positive bus-bar and negative busbar it
Between, wherein, load resistance R11 resistance is 6 Ω, and artifical resistance R12 resistance is 1.2 Ω, in the case of switch K1 closures,
The effect of load resistance R11 pressure differences produces 20A load current, controlling switch K12 closures, artifical resistance R12 both ends is also produced
Raw 120V pressure differences, and then 100A analog current is produced, analog current makes the output current of load box after confluxing with load current
Rise sharply to 6 times of load current, i.e. 120A, so as to simulate the process that surge current rises sharply.After switching the of short duration closure 70ms of K12,
Controlling switch K12 disconnects, and it is 0A to make analog current, and the output current of load box drops back to original state, i.e. 20A, so as to simulate surge electricity
Flow the process of rapid drawdown.
In order to which tester can select different stalls according to the actual requirements, the load resistance R21 that resistance is 3 Ω is connected
Switch K21 be followed by between positive bus-bar and negative busbar, resistance be 0.6 Ω artifical resistance R22 tandem taps K22 be followed by
Between positive bus-bar and negative busbar.In use, if switch K11 is closed simultaneously controlling switch K12 by tester from the first gear
Cut-off/close；If, will switch K21 closures and controlling switch K22 cut-off/closes from the second gear.Certainly, also can basis
It is actual to increase more gears so that tester select to export different surge electricity according to different capacity and resistance requirement
Stream, so as to be applicable the performance test of a variety of switching devices.
In order to realize that driving power is small and saturation pressure reduces in handoff procedure is switched, switch K11, switch K12, switch
K21, switch K22 realize switch handoff functionality from IGBT pipes.Further, it is defeated to distinguish also to be built-in with PLC for load box
Go out the adjustable pulse signal of dutycycle to switch K11, switch K12, switch K21, switch K22, so as to control the disconnected of each switch
Open or close, realize freely setting for surge time of origin and duration.
Certain artifical resistance R12, R22 also can realize the adjustment of surge current peak value using adjustable resistance.
Further, voltage collector is additionally provided with load box to gather the voltage in load box to PLC, is additionally provided with electric current
Collector adjusts pulse signal in real time to PLC, PLC to gather the electric current in load box according to the voltage and current collected
Dutycycle, realize intelligent control.
Finally it should be noted that above example is only illustrating the technical scheme of the invention, rather than to this hair
It is bright create protection domain limitation, although being explained with reference to preferred embodiment to the invention, this area it is general
It is logical it will be appreciated by the skilled person that can be modified to the technical scheme of the invention or equivalent substitution, without departing from this
The spirit and scope of innovation and creation technical scheme.
Claims (8)
1. a kind of load box, including positive bus-bar, negative busbar and load resistance R11, load resistance R11 are connected on positive bus-bar and negative busbar
Between to form the first load branch, it is characterised in that：
Also include switch K12 and resistance is less than load resistance R11 artifical resistance R12, artifical resistance R12 and switch K12 series connection
It is in parallel with first load branch afterwards.
2. according to a kind of load box as claimed in claim 1, it is characterised in that：The switch K12 is IGBT pipes.
3. according to a kind of load box as claimed in claim 1, it is characterised in that：The artifical resistance R12 is adjustable resistance.
4. according to a kind of load box as claimed in claim 1, it is characterised in that：Also include switch K11, switch K21 and resistance
Different from the load resistance R21 of the load resistance R11, switch K11 is serially connected on first load branch, is switched K21 and is born
Carry resistance R21 series connection to be followed by between positive bus-bar and negative busbar, to form the second load branch.
5. according to a kind of load box as claimed in claim 4, it is characterised in that：Also include switch K22 and resistance less than described
Load resistance R21 artifical resistance R22, artifical resistance R22 and switch K22 are in parallel with second load branch after connecting.
6. according to a kind of load box as claimed in claim 4, it is characterised in that：The switch K11 and/or switch K21 are
IGBT is managed.
7. according to a kind of load box as claimed in claim 4, it is characterised in that：The switch K22 is IGBT pipes.
8. according to a kind of load box as claimed in claim 4, it is characterised in that：The artifical resistance R22 is adjustable resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721277792.2U CN207215874U (en) | 2017-09-29 | 2017-09-29 | A kind of load box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721277792.2U CN207215874U (en) | 2017-09-29 | 2017-09-29 | A kind of load box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207215874U true CN207215874U (en) | 2018-04-10 |
Family
ID=61820136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721277792.2U Active CN207215874U (en) | 2017-09-29 | 2017-09-29 | A kind of load box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207215874U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607754A (en) * | 2017-09-29 | 2018-01-19 | 广东福德电子有限公司 | A kind of load box |
| CN111831501A (en) * | 2020-07-21 | 2020-10-27 | 北京中科仙络咨询服务有限公司 | Assembled water-cooling load box |
-
2017
- 2017-09-29 CN CN201721277792.2U patent/CN207215874U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607754A (en) * | 2017-09-29 | 2018-01-19 | 广东福德电子有限公司 | A kind of load box |
| CN111831501A (en) * | 2020-07-21 | 2020-10-27 | 北京中科仙络咨询服务有限公司 | Assembled water-cooling load box |
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