CN204705930U - A kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test - Google Patents
A kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test Download PDFInfo
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- CN204705930U CN204705930U CN201520443918.3U CN201520443918U CN204705930U CN 204705930 U CN204705930 U CN 204705930U CN 201520443918 U CN201520443918 U CN 201520443918U CN 204705930 U CN204705930 U CN 204705930U
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Abstract
The utility model provides a kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test, the two ends of this program controlled constant current source are connected with a branch road feeder line on tested low-voltage electrical switchgear assembly and mains voltage source respectively, and it is formed by three single-phase AC program controlled constant current sources; Wherein, single-phase AC program controlled constant current source comprise sequentially connect the electromagnetic interface filter for filtering, for exchange turn direct current current rectifying and wave filtering circuit, the full-bridge converter for regulated dc voltage pulse width, the rising current transformer for High frequency filter, load, for gathering the current transformer of load current and the programmable control circuit for exporting low and high level signal; Wherein, electromagnetic interface filter is also connected with mains voltage source; Full-bridge converter is also connected with programmable control circuit.Implement the utility model embodiment, it is with low cost, can overcome and regulate difficulty and the problem such as electric current is unstable, reach the object reducing temperature rise test error and electric energy loss.
Description
Technical field
The utility model relates to low-voltage electrical set of equipments temperature rise test technical field, particularly relates to a kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test.
Background technology
Temperature rise is the vital technical parameter of low-voltage electrical switchgear assembly and index, it is very big on the reliable impact of low-voltage electrical switchgear assembly, according to the regulation of GB GB7251-2013, the temperature rise of low-voltage electrical switchgear assembly need relate to equipment itself, and the temperature rise of each functional unit, main bus-bar and branch road feeder line in equipment.As can be seen here, the key of checking low-voltage electrical switchgear assembly temperature rise is the stability and the degree of accuracy that are verified specified current flow on the parts such as each functional unit, main bus-bar, distribution bus, when specified current flow on each parts is more stable and precision is higher, then the temperature rise verified is more accurate.
In prior art, low-voltage electrical switchgear assembly temperature rise test system is by arranging a Large Copacity multiple magnetic circuit transformer at equipment under test power input, after civil power being transformed into the out-put supply with low-voltage (as 8V ~ 15V) and big current (as 1KA ~ 50KA), the each branch feeder of equipment under test connecing variohm or current regulator as load to obtain measuring current, making output current reach setting current value by regulating variohm or current regulator.Because the volume of Large Copacity multiple magnetic circuit transformer equipment own is large, after mixing variohm or current regulator load, the shortcoming caused is that floor area is very large, require high to lab space, and equipment heaviness can not move, many complete equipments cannot be carried out detect simultaneously, simultaneously, due to the fluctuation of line voltage, lead resistance change in current loop, the resistance heating change of load own, cause each branch current unstable, measuring current changes thereupon, therefore, operating personnel often regulating resistor or current transformer must carry out steady current, time-consumingly take energy, precision still cannot ensure, and a large amount of perceptual reactive loss can be produced under low-voltage, high-current, electric energy directly consumes at copper bus-bar, on resistor or current transformer, not only affect power grid quality, but also cause the huge waste of the energy.
Summary of the invention
The utility model embodiment technical matters to be solved is, a kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test is provided, it is with low cost, can overcome and regulate difficulty and the problem such as electric current is unstable, reach the object reducing temperature rise test error and electric energy loss.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test, the two ends of described program controlled constant current source are connected with a branch road feeder line on tested low-voltage electrical switchgear assembly and mains voltage source respectively, and it is formed by three single-phase AC program controlled constant current sources; Wherein,
Described single-phase AC program controlled constant current source comprise sequentially connect the electromagnetic interface filter for filtering, for exchange turn direct current current rectifying and wave filtering circuit, the full-bridge converter for regulated dc voltage pulse width, the rising current transformer for High frequency filter, load, for gathering the current transformer of described load current and the programmable control circuit for exporting low and high level signal; Wherein, described electromagnetic interface filter is also connected with described mains voltage source; Described full-bridge converter is also connected with described programmable control circuit.
Wherein, described single-phase AC program controlled constant current source also comprises the touch-screen be connected with described programmable control circuit.
Implement the utility model embodiment, there is following beneficial effect:
1, in the utility model embodiment, because system adopts multiple three-phase alternating current program controlled constant current source to substitute variohm or current regulator, the change of control load electric current, thus guarantee that each branch road feeder current is stablized constant, therefore namely overcome and regulate difficulty and the problem such as electric current is unstable, reach the object reducing temperature rise test error and electric energy loss, can avoid again adopting high-precision electronic load cabinet to bring the problem of cost intensive;
2, in the utility model embodiment, because system directly adopts multiple three-phase alternating current program controlled constant current source to be connected with mains voltage source, decrease Large Copacity multiple magnetic circuit transformer, thus greatly reduce cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, the accompanying drawing obtaining other according to these accompanying drawings still belongs to category of the present utility model.
The system architecture schematic diagram of the program controlled constant current source for low voltage voltage switchgear assembly temperature rise test that Fig. 1 provides for the utility model embodiment;
Fig. 2 is the system architecture schematic diagram of single-phase AC program controlled constant current source in Fig. 1;
Fig. 3 is the circuit connection diagram of electromagnetic interface filter application scenarios in Fig. 1;
Fig. 4 is the circuit connection diagram of current rectifying and wave filtering circuit application scenarios in Fig. 1;
Fig. 5 is the circuit connection diagram of full-bridge converter application scenarios in Fig. 1;
In figure, 1-single-phase AC program controlled constant current source, 11-EMI wave filter, 12-current rectifying and wave filtering circuit, 13-full-bridge converter, 14-rising current transformer, 15-load, 16-current transformer, 17-programmable control circuit, 18-touch-screen.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figures 1 to 5, for in the utility model embodiment, a kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test provided, the two ends of program controlled constant current source are connected with the upper branch road feeder line of tested low-voltage electrical switchgear assembly (not shown) and mains voltage source respectively, and it is formed by three single-phase AC program controlled constant current sources 1; Wherein,
Single-phase AC program controlled constant current source 1 comprise sequentially connect the electromagnetic interface filter 11 for filtering, for exchange turn direct current current rectifying and wave filtering circuit 12, the full-bridge converter 13 for regulated dc voltage pulse width, the rising current transformer 14 for High frequency filter, load 15, for gathering the current transformer 16 of load current and the programmable control circuit 17 for exporting low and high level signal; Wherein, electromagnetic interface filter 11 is connected with mains voltage source, and full-bridge converter 13 is also connected with programmable control circuit 17.
Should be noted that, current threshold is preset with in programmable control circuit 17, when after the electric current getting current transformer 16 collection, compare with the current threshold preset, different level signals is exported according to comparative result, make full-bridge converter 13 according to different level signals, control the adjustment of direct current voltage pulse width.
As an example, when the current threshold that the electric current > that current transformer 16 gathers presets, programmable control circuit 17 output low level signal, makes full-bridge converter 13 turn down the width of DC voltage current PRF, thus reduces the electric current of branch road feeder line; When the current threshold that the electric current < that current transformer 16 gathers presets, programmable control circuit 17 exports high level signal, makes full-bridge converter 13 heighten the width of DC voltage current PRF, thus compensates the electric current of branch road feeder line.
In order to the current threshold preset according to different operating environment conversion programmable control circuit 17, meet actual requirement needs, therefore single-phase AC program controlled constant current source 1 also comprises the touch-screen 18 be connected with programmable control circuit 17, can arrange required current threshold by this touch-screen 18.
In the utility model embodiment, the current phase inequality of three single-phase AC program controlled constant current sources 1 120 degree, thus meet the requirement of line voltage.
The principle of work of single-phase AC program controlled constant current source is: AC power is isolated through electromagnetic interface filter 11 and become DC voltage after rectifying and wave-filtering 12, full-bridge converter 13 again by being made up of power electronic devices, output in load 15 after exporting to rising current transformer 14 filtering high fdrequency component, the electric current that current transformer 16 gathers in load 15 is sent in programmable control circuit 17 as sample rate current, programmable control circuit 17 gathers according to the current threshold preset and current transformer 16 sample rate current exported and compares, according to comparative result, export different level signals and carry out pulse width modulation controlled to full-bridge converter 13 pairs of DC voltage, realize the protection of the stable of output current and various fault.
As shown in Figure 3, be the circuit connection diagram of electromagnetic interface filter 11 application scenarios in the utility model embodiment, resistance R and electric capacity L1 forms the bandpass filter of isolation high-frequency alternating voltage, then carries out boosting process by inductance L 1 to L4.
As shown in Figure 4, be the circuit connection diagram of rectifying and wave-filtering 12 application scenarios in the utility model embodiment, by the rectifier bridge formed by four diodes, the alternating voltage after electromagnetic interface filter 11 filtering process be transformed into DC voltage.
As shown in Figure 5, for the circuit connection diagram of full-bridge converter 13 application scenarios in the utility model embodiment, the branch road that different pulse can be regulated to export according to level signal difference by two is formed, each branch road includes the input side formed by an amplifying circuit and a field effect transistor, and the outgoing side formed by another amplifying circuit and another field effect transistor.When programmable control circuit 17 exports high level signal, full-bridge converter 13 can select input side voltage to be V
i1branch road; When programmable control circuit 17 output low level signal, full-bridge converter 13 can select input side voltage to be V
i2branch road.
Implement the utility model embodiment, there is following beneficial effect:
1, in the utility model embodiment, because system adopts multiple three-phase alternating current program controlled constant current source to substitute variohm or current regulator, the change of control load electric current, thus guarantee that each branch road feeder current is stablized constant, therefore namely overcome and regulate difficulty and the problem such as electric current is unstable, reach the object reducing temperature rise test error and electric energy loss, can avoid again adopting high-precision electronic load cabinet to bring the problem of cost intensive;
2, in the utility model embodiment, because system directly adopts multiple three-phase alternating current program controlled constant current source to be connected with mains voltage source, decrease Large Copacity multiple magnetic circuit transformer, thus greatly reduce cost.
Above disclosedly be only a kind of preferred embodiment of the utility model, certainly can not limit the interest field of the utility model with this, therefore according to the equivalent variations that the utility model claim is done, still belong to the scope that the utility model is contained.
Claims (3)
1. the program controlled constant current source for low voltage voltage switchgear assembly temperature rise test, it is characterized in that, the two ends of described program controlled constant current source are connected with a branch road feeder line on tested low-voltage electrical switchgear assembly and mains voltage source respectively, and it is formed by three single-phase AC program controlled constant current sources (1); Wherein,
Described single-phase AC program controlled constant current source comprise sequentially connect the electromagnetic interface filter for filtering (11), for exchange turn direct current current rectifying and wave filtering circuit (12), the full-bridge converter (13) for regulated dc voltage pulse width, the rising current transformer (14) for High frequency filter, load (15), for gathering the current transformer (16) of described load current and the programmable control circuit (17) for exporting low and high level signal; Wherein, described electromagnetic interface filter (11) is also connected with described mains voltage source; Described full-bridge converter (13) is also connected with described programmable control circuit (17).
2. program controlled constant current source as claimed in claim 1, it is characterized in that, described single-phase AC program controlled constant current source (1) also comprises the touch-screen (18) be connected with described programmable control circuit.
3. program controlled constant current source as claimed in claim 1 or 2, is characterized in that, the current phase inequality 120 degree of described three single-phase AC program controlled constant current sources (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520443918.3U CN204705930U (en) | 2015-06-24 | 2015-06-24 | A kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test |
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| CN201520443918.3U CN204705930U (en) | 2015-06-24 | 2015-06-24 | A kind of program controlled constant current source for low voltage voltage switchgear assembly temperature rise test |
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| CN204705930U true CN204705930U (en) | 2015-10-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394800A (en) * | 2017-08-11 | 2017-11-24 | 哈尔滨理工大学 | A kind of three-phase power supply system |
| CN107727962A (en) * | 2017-09-30 | 2018-02-23 | 深圳供电局有限公司 | High-voltage switch cabinet temperature rise test device, system and method |
-
2015
- 2015-06-24 CN CN201520443918.3U patent/CN204705930U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394800A (en) * | 2017-08-11 | 2017-11-24 | 哈尔滨理工大学 | A kind of three-phase power supply system |
| CN107394800B (en) * | 2017-08-11 | 2020-05-01 | 哈尔滨理工大学 | Three-phase power supply system |
| CN107727962A (en) * | 2017-09-30 | 2018-02-23 | 深圳供电局有限公司 | High-voltage switch cabinet temperature rise test device, system and method |
| CN107727962B (en) * | 2017-09-30 | 2024-06-07 | 深圳供电局有限公司 | High-voltage switch cabinet temperature rise test device, system and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151014 |