CN202870176U - Direct-current grounding resistor detection device - Google Patents
Direct-current grounding resistor detection device Download PDFInfo
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- CN202870176U CN202870176U CN 201220514195 CN201220514195U CN202870176U CN 202870176 U CN202870176 U CN 202870176U CN 201220514195 CN201220514195 CN 201220514195 CN 201220514195 U CN201220514195 U CN 201220514195U CN 202870176 U CN202870176 U CN 202870176U
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Abstract
The utility model relates to a direct-current grounding resistor detection device which comprises a first branch and a second branch, wherein the first branch is formed by connecting a third resistor and a fourth resistor in series and is connected between positive and negative electrodes of a photovoltaic cell panel, the second branch is connected between the positive and negative electrodes of the photovoltaic cell panel and includes a first switch, a first resistor, a second switch and a second resistor which are sequentially connected in series, and a joint of the third resistor and the fourth resistor in the first branch and a joint of the first resistor and the second switch in the second branch are connected by a detection resistor. The direct-current grounding resistor detection device is simple in detection process and high in detection precision and can be used to detect an insulation resistor in real time, thus ensuring the safe operation of a photovoltaic power generation system and preventing accidents doing harm to personal safety from happening.
Description
Technical field
The utility model relates to a kind of insulation against ground resistor detecting device, refers more particularly to a kind of insulation against ground resistor detecting device of using for photovoltaic generating system.
Background technology
For understanding the state of insulation of solar photovoltaic generation system each several part, judge whether and to switch on that this just need to carry out megger test.Carry out the test of insulation resistance when generally being making regular check on before the complete preparation of solar energy photovoltaic system construction and installation brings into operation, in the operational process and when determining to break down.Because solar cell array has high voltage to exist by day all the time, powerful inverter often output voltage up to 1000VDC.In actual use, because the impact of environment (ultraviolet ray, dust, sleet etc.), circuit can produce aging, the corresponding decline of insulation degree meeting, tend to affect personal safety, simultaneously also can affect the normal operation of whole system, for the normal operation of power station staff and system very important meaning be arranged so detect in real time the size of DC ground resistance.
The method of detection DC ground resistance commonly used is mainly by balanced bridge method and unbalanced electric bridge at present, and unbalanced electric bridge is extensively used because cost is low, computing is simple.As shown in Figure 1: Rp and Rn are the straight-flow system resistance to earth among the figure; Two resistance R in Rp and the parallel connection of Rn two ends; By detecting resistance both end voltage Ui and Uj, then according to the connection in series-parallel bleeder circuit, calculate respectively over against ground and bear insulation resistance over the ground.But when Rp and Rn descended according to a certain percentage, this electric bridge just can't detect the actual size of resistance, can not reflect accurately the stake resistance of straight-flow system reality.
Summary of the invention
Technical matters to be solved by this invention is, provide a kind of for photovoltaic system insulation against ground resistance detecting circuit, the equipment that can be implemented in calculates the photovoltaic module insulation resistance over the ground of photovoltaic inversion device accurately in the whole process of operation, to guarantee the stable operation of personal safety and system and equipment.
For solving the problems of the technologies described above, the present invention is by the following technical solutions: a kind of DC ground resistance pick-up unit, include the first branch road that the 3rd resistance is connected and is formed by connecting with the 4th resistance, described the first branch road is connected between photovoltaic pond plate positive pole and the photovoltaic pond plate negative pole, it is characterized in that also including the second branch road, described the second branch road is connected between photovoltaic pond plate positive pole and the photovoltaic pond plate negative pole, described the second branch road includes successively the first switch of serial connection, the first resistance, second switch and the second resistance, in described the first branch road in the junction of the 3rd resistance and the 4th resistance and the second branch road the first resistance be connected by detecting resistance with the junction of second switch.
As a kind of improvement, described the first resistance, the second resistance, the 3rd resistance and the 4th resistance equate.
The utility model process is simple, and accuracy of detection is high, and realization that can be real-time has guaranteed the Accidental occurrence of safe operation and the anti-damage personal safety of photovoltaic generating system to the detection of insulation resistance.
Description of drawings
Fig. 1 is the circuit theory diagrams of prior art DC ground resistance pick-up unit.
Fig. 2 is the circuit theory diagrams of the utility model DC ground resistance pick-up unit.
Fig. 3 is the sampling calculation process block diagram of the utility model DC ground resistance pick-up unit.
Embodiment
Such as Fig. 2, shown in 3, a kind of embodiment of DC ground resistance pick-up unit, include the 3rd resistance R 3 and the 4th resistance R 4 is connected in series the first branch road that forms, described the first branch road is connected between photovoltaic pond plate positive pole and the photovoltaic pond plate negative pole, it is characterized in that also including the second branch road, described the second branch road is connected between photovoltaic pond plate positive pole and the photovoltaic pond plate negative pole, described the second branch road includes successively the first switch S 1 of serial connection, the first resistance R 1, second switch S2 and the second resistance R 2, in described the first branch road in the junction of the 3rd resistance R 3 and the 4th resistance R 4 and the second branch road the first resistance R 1 be connected by detecting resistance R s with the junction of second switch S2.
Utilize structure of the present utility model, and measure by following steps:
1: detect photovoltaic pond plate cathode voltage Vpv+ by microprocessor and photovoltaic pond plate voltage detection unit (modes such as voltage sensor and resistance detection);
2: make the S1 in the resistance switch circuit be in closure state, S2 is in off-state, in resistance R 3 places in circuit, by sampling resistor Rs and interlock circuit, obtains output signal U 1 after the processing.Can obtain following equation:
3: make the S1 in the resistance switch circuit be in off-state, S2 is in closure state, in resistance R 4 places in circuit, by sampling resistor Rs and interlock circuit, obtains output signal U 2 after the processing.Can obtain following equation:
Just can calculate accurately Rp and Rn by above two equations, like this microprocessor unit just can according to calculate Rp and the resistance of Rn, judge whether it satisfies the safety requirement.If satisfy the safety requirement, then microprocessor allows photovoltaic DC-to-AC converter startup work: if do not satisfy the safety requirement, then microprocessor is forbidden photovoltaic DC-to-AC converter startup work, provides alarm and shows error code etc.
As a kind of improved embodiment, described the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 resistances equate that the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 resistances equate to be conducive to simplify computation process.
Technician in the art will be appreciated that, above embodiment illustrates inner characteristic of the present utility model, but not to the restriction of utility model, as long as connotation drops on interiorly any change or be equal to replacement of the utility model, all will drop in claims scope of the present utility model.
Claims (2)
1. DC ground resistance pick-up unit, include the 3rd resistance (R3) and be connected in series the first branch road that forms with the 4th resistance (R4), described the first branch road is connected between photovoltaic pond plate positive pole and the photovoltaic pond plate negative pole, it is characterized in that also including the second branch road, described the second branch road is connected between photovoltaic pond plate positive pole and the photovoltaic pond plate negative pole, described the second branch road includes successively first switch (S1) of serial connection, the first resistance (R1), second switch (S2) and the second resistance (R2), in described the first branch road in the junction of the 3rd resistance (R3) and the 4th resistance (R4) and the second branch road the first resistance (R1) be connected by detecting resistance (Rs) with the junction of second switch (S2).
2. a kind of DC ground resistance pick-up unit according to claim 1 is characterized in that described the first resistance (R1), the second resistance (R2), the 3rd resistance (R3) and the 4th resistance (R4) resistance equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220514195 CN202870176U (en) | 2012-10-09 | 2012-10-09 | Direct-current grounding resistor detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220514195 CN202870176U (en) | 2012-10-09 | 2012-10-09 | Direct-current grounding resistor detection device |
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| CN202870176U true CN202870176U (en) | 2013-04-10 |
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| CN 201220514195 Expired - Fee Related CN202870176U (en) | 2012-10-09 | 2012-10-09 | Direct-current grounding resistor detection device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529302A (en) * | 2013-09-24 | 2014-01-22 | 国家电网公司 | Performance test circuit and test method for photovoltaic module |
| CN103983857A (en) * | 2014-04-25 | 2014-08-13 | 南车株洲电力机车研究所有限公司 | Direct current insulation monitoring circuit and method |
| CN104345215A (en) * | 2013-07-31 | 2015-02-11 | 艾默生网络能源有限公司 | Insulation resistance detecting method, device, and apparatus |
| CN104749441A (en) * | 2015-03-27 | 2015-07-01 | 华为技术有限公司 | Insulation resistance measurement circuit |
| CN106291117A (en) * | 2016-07-19 | 2017-01-04 | 阳光电源股份有限公司 | A kind of direct current insulation against ground testing circuit and direct current insulation against ground detection method |
| CN104049150B (en) * | 2014-06-30 | 2017-10-17 | 阳光电源股份有限公司 | Photovoltaic module insulation against ground detection means and method and grid-connected photovoltaic system |
| CN107643447A (en) * | 2017-08-31 | 2018-01-30 | 北京新能源汽车股份有限公司 | A kind of vehicle insulation detecting circuit and method |
| CN108732511A (en) * | 2017-04-18 | 2018-11-02 | 中兴通讯股份有限公司 | A kind of insulating resistor detecting circuit and detection method of DC power system |
| CN109541368A (en) * | 2018-11-08 | 2019-03-29 | 贵阳英纳瑞电气有限公司 | A kind of circuit and detection method for the detection of direct current system bus insulation |
| CN112578300A (en) * | 2020-11-30 | 2021-03-30 | 珠海格力电器股份有限公司 | Detection device and method for insulation resistance of power battery and automobile |
-
2012
- 2012-10-09 CN CN 201220514195 patent/CN202870176U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104345215A (en) * | 2013-07-31 | 2015-02-11 | 艾默生网络能源有限公司 | Insulation resistance detecting method, device, and apparatus |
| CN104345215B (en) * | 2013-07-31 | 2017-05-10 | 艾默生网络能源有限公司 | Insulation resistance detecting method, device, and apparatus |
| CN103529302A (en) * | 2013-09-24 | 2014-01-22 | 国家电网公司 | Performance test circuit and test method for photovoltaic module |
| CN103529302B (en) * | 2013-09-24 | 2017-12-12 | 国家电网公司 | The performance test circuit and method of testing of a kind of photovoltaic module |
| CN103983857A (en) * | 2014-04-25 | 2014-08-13 | 南车株洲电力机车研究所有限公司 | Direct current insulation monitoring circuit and method |
| CN103983857B (en) * | 2014-04-25 | 2017-07-28 | 南车株洲电力机车研究所有限公司 | A kind of D.C. isolation observation circuit and method |
| CN104049150B (en) * | 2014-06-30 | 2017-10-17 | 阳光电源股份有限公司 | Photovoltaic module insulation against ground detection means and method and grid-connected photovoltaic system |
| CN104749441A (en) * | 2015-03-27 | 2015-07-01 | 华为技术有限公司 | Insulation resistance measurement circuit |
| CN104749441B (en) * | 2015-03-27 | 2018-11-16 | 华为技术有限公司 | A kind of insulation resistance measurement circuit |
| CN106291117A (en) * | 2016-07-19 | 2017-01-04 | 阳光电源股份有限公司 | A kind of direct current insulation against ground testing circuit and direct current insulation against ground detection method |
| CN106291117B (en) * | 2016-07-19 | 2018-12-28 | 阳光电源股份有限公司 | A kind of direct current insulation against ground detection circuit and direct current insulation against ground detection method |
| CN108732511A (en) * | 2017-04-18 | 2018-11-02 | 中兴通讯股份有限公司 | A kind of insulating resistor detecting circuit and detection method of DC power system |
| CN107643447A (en) * | 2017-08-31 | 2018-01-30 | 北京新能源汽车股份有限公司 | A kind of vehicle insulation detecting circuit and method |
| CN109541368A (en) * | 2018-11-08 | 2019-03-29 | 贵阳英纳瑞电气有限公司 | A kind of circuit and detection method for the detection of direct current system bus insulation |
| CN112578300A (en) * | 2020-11-30 | 2021-03-30 | 珠海格力电器股份有限公司 | Detection device and method for insulation resistance of power battery and automobile |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20171009 |