CN202676898U - Insulation detection zero drift automatic correcting device of direct current power supply system - Google Patents
Insulation detection zero drift automatic correcting device of direct current power supply system Download PDFInfo
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- CN202676898U CN202676898U CN 201220285820 CN201220285820U CN202676898U CN 202676898 U CN202676898 U CN 202676898U CN 201220285820 CN201220285820 CN 201220285820 CN 201220285820 U CN201220285820 U CN 201220285820U CN 202676898 U CN202676898 U CN 202676898U
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Abstract
The utility model provides an insulation detection zero drift automatic correcting device of a direct current power supply system comprising a bus unbalanced bridge detection unit. The bus unbalanced bridge detection unit comprises a positive bus-bar switching resistor, a positive bus-bar switching switch, a negative bus-bar switching resistor, and a negative bus-bar switching switch. The positive bus-bar switching resistor and the positive bus-bar switching switch are in a serial connection. The negative bus-bar switching resistor and the negative bus-bar switching switch are in a serial connection. A branch insulation detection unit is provided, and comprises a current leakage sensor, which is connected with an anode and a cathode of the branch insulation detection unit. In the utility model, the zero drift can be automatically corrected by the cooperation between the current leakage sensor of the branch insulation detection unit and the bus unbalanced bridge detection unit, the zero drift problem of the current leakage sensor can be effectively removed, and the accuracy of the insulation detection can be improved. The device provided in the utility model is simple-structured, and is easy to realize.
Description
Technical field
The utility model relates to a kind of DC power-supply system and meets people's insulation monitoring and warning device, and the insulation that relates in particular to a kind of DC power-supply system detects the drift automatic correction device.
Background technology
The insulation of DC power-supply system detects and generally is divided into main road detection and branch road detection, needs to come the detection branch leakage current by sensor in branch road detects.And according to the difference of sensor, branch road detects to be divided into again and exchanges detection method and dc detection method.Exchange detection method because will inject low-frequency ac signal to dc bus, thereby bus caused interference, and since the existence of distributed capacitance to cause exchanging the accuracy of detection of detection method not too accurate, also can cause simultaneously whole branch road monitoring time long.The advantages such as dc detection method is not because need to inject low-frequency ac signal to dc bus, and it is accurate to have accuracy of detection, and polling period is short, thereby in insulation detects, be used widely.
What use in dc detection method is the DC leakage current sensor, and the DC leakage current sensor adopts electromagnetic induction principle, and external magnetic field disturbs and all can cause leakage current sensor output drift voltage to produce drift, i.e. drift.Because the leakage current sensor sampling all is little current signal, generally several milliamperes of ranks, the drift that leakage current sensor is less will produce a very large impact measuring accuracy, the problems such as mistake alarm that cause insulation to detect, therefore, how can eliminate the drift of leakage current sensor, be the road of improving the certainty of insulation detection device reliability.
Summary of the invention
Technical problem to be solved in the utility model is to need a kind of insulation of DC power-supply system to detect the drift automatic correction device, can effectively eliminate the drift problem of leakage current sensor, improves the precision that insulation detects.
To this, the utility model provides a kind of insulation of DC power-supply system to detect the drift automatic correction device, comprising:
Bus unbalanced bridge detecting unit, described bus unbalanced bridge detecting unit comprises positive bus-bar switching resistance, positive bus-bar fling-cut switch, negative busbar switching resistance and negative busbar fling-cut switch, described positive bus-bar switching resistance is connected in series mutually with the positive bus-bar fling-cut switch, and described negative busbar switching resistance is connected in series mutually with the negative busbar fling-cut switch; And,
Branch road insulation detecting unit, described branch road insulation detecting unit comprises leakage current sensor, described leakage current sensor is connected with the both positive and negative polarity of branch road insulation detecting unit.
Wherein, described positive bus-bar switching resistance is connected in series mutually with the positive bus-bar fling-cut switch, is serially connected between positive bus-bar and the ground, forms the detection loop to positive bus-bar, and described positive bus-bar fling-cut switch is electronic switch, is used for realization to the control of positive bus-bar switching resistance break-make; Described negative busbar switching resistance is connected in series mutually with the negative busbar fling-cut switch, is serially connected between negative busbar and the ground, forms the detection loop to negative busbar, and described negative busbar fling-cut switch is electronic switch, is used for realization to the control of negative busbar switching resistance break-make; Described branch road insulation detecting unit comprises one or more than one detection branch, described detection branch comprises anodal insulation against ground resistance and negative pole insulation against ground resistance, when the anodal insulation against ground resistance of detection branch or negative pole insulation against ground resistance occur to reduce, by reading the output voltage of leakage current sensor, the size of detection branch leakage current can be obtained, thereby the size of branch road insulating resistance value can be calculated.
After the utility model powers on, detect the bus insulation resistance value by unbalanced electric bridge first, it is the insulating resistance value that bus unbalanced bridge detecting unit detects positive and negative busbar, if the bus insulation resistance value is greater than certain value, then disconnect the fling-cut switch of unbalanced bridge, described fling-cut switch comprises positive bus-bar fling-cut switch and negative busbar fling-cut switch, and record respectively the output current value of the leakage current sensor of every detection branch, be used as the drift record of every detection branch leakage current sensor with this; When start branch road insulation detecting unit next time, the output valve of the leakage current sensor of every detection branch that sampling is obtained deducts the drift numerical value of last registration, with this as final leakage current numerical value, just can effectively eliminate the drift problem of leakage current sensor, improve the precision that insulation detects.
Compared with prior art, the utility model provides a kind of insulation of DC power-supply system to detect the drift automatic correction device, can realize the drift automatic calibration by the insulate leakage current sensor of detecting unit of branch road, effectively eliminated the drift problem of leakage current sensor, improve the precision that insulation detects, simple in structure, be easy to realize.
Further improvement of the utility model is that described branch road insulation detecting unit comprises the detection branch more than at least one, and every detection branch all comprises a leakage current sensor.In the described road insulation detecting unit, comprise the detection branch more than at least one, the road that namely comprises one or more than one detections, the quantity of described detection branch can arrange according to actual conditions, every detection branch comprises a leakage current sensor, and wherein the both positive and negative polarity of detection branch all will pass leakage current sensor; When the anodal insulation against ground resistance of detection branch or negative pole insulation against ground resistance generation reduction, by reading the output voltage of leakage current sensor, just the size of this detection branch leakage current can be obtained, thereby the size of outlet insulation detecting unit insulating resistance value can be calculated.
Further improvement of the utility model is that the resistance of described positive bus-bar switching resistance and negative busbar switching resistance equates.Wherein, the resistance of described positive bus-bar switching resistance and negative busbar switching resistance equates, is convenient to the insulating resistance value that bus unbalanced bridge detecting unit detects positive and negative busbar, also is convenient to the calculating to leakage current sensor drift value.
Further improvement of the utility model is that described positive bus-bar fling-cut switch and negative busbar fling-cut switch are relay.Preferably, described relay is solid-state relay.Can realize well the break-make of positive and negative busbar by relay, guarantee that bus unbalanced bridge detecting unit detects the insulating resistance value of positive and negative busbar; Described relay is preferably solid-state relay, described solid-state relay also claims solid-state relay, English name is Solid State Relay, be called for short SSR, it is the switching device shifter that replaces the traditional electrical contact with semiconductor devices, belong to the noncontacting switch device with relay characteristic, simplified control procedure.
Further improvement of the utility model is that described positive bus-bar fling-cut switch and negative busbar fling-cut switch are electronic switch.Electronic switch refers to utilize power electronic devices to realize the operation unit of connecting and disconnecting of the circuit, comprises at least a controlled electronic valve device, can promote the break-make control to positive and negative busbar, realizes that the insulating resistance value of positive and negative busbar detects.
The beneficial effects of the utility model are, provide a kind of insulation of DC power-supply system to detect the drift automatic correction device, can cooperatively interact by insulate leakage current sensor and the bus unbalanced bridge detecting unit of detecting unit of branch road, to realize the drift automatic calibration, effectively eliminated the drift problem of leakage current sensor, improve the precision that insulation detects, the utility model is simple in structure, is easy to realize.
Description of drawings
Fig. 1 is the structural representation of a kind of embodiment of the utility model;
Fig. 2 is the workflow diagram of a kind of embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing, more excellent embodiment of the present utility model is described in further detail.
Embodiment 1:
As shown in Figure 1, this example provides a kind of insulation of DC power-supply system to detect the drift automatic correction device, comprising:
Bus unbalanced bridge detecting unit, described bus unbalanced bridge detecting unit comprises positive bus-bar switching resistance R 1, positive bus-bar fling-cut switch K1, negative busbar switching resistance R 2 and negative busbar fling-cut switch K2, described positive bus-bar switching resistance R 1 is connected in series mutually with positive bus-bar fling-cut switch K1, and described negative busbar switching resistance R 2 is connected in series mutually with negative busbar fling-cut switch K2; And,
Branch road insulation detecting unit, described branch road insulation detecting unit comprises leakage current sensor H1, described leakage current sensor H1 is connected with the both positive and negative polarity of branch road insulation detecting unit.
Among Fig. 1, RP is that positive bus-bar insulation against ground resistance, RN are negative busbar insulation against ground resistance, R1 is positive bus-bar switching resistance, R2 is negative busbar switching resistance, K1 is the positive bus-bar fling-cut switch of positive bus-bar switching resistance R 1 correspondence, K2 is the negative busbar fling-cut switch of negative busbar switching resistance R 2 correspondences, RL is detection branch load equivalent resistance, RLP is that the anodal insulation against ground resistance of detection branch, RLN are detection branch negative pole insulation against ground resistance, H1 is the detection branch leakage current sensor, and the detection branch both positive and negative polarity all passes leakage current sensor H1.
Wherein, described positive bus-bar switching resistance R 1 is connected in series mutually with positive bus-bar fling-cut switch K1, is serially connected between positive bus-bar and the ground, forms the detection loop to positive bus-bar, described positive bus-bar fling-cut switch K1 is electronic switch, is used for realization to the control of positive bus-bar switching resistance R 1 break-make; Described negative busbar switching resistance R 2 is connected in series mutually with negative busbar fling-cut switch K2, is serially connected between negative busbar and the ground, forms the detection loop to negative busbar, and described negative busbar fling-cut switch K2 is electronic switch, is used for realization to the control of negative busbar switching resistance R 2 break-makes; Described branch road insulation detecting unit comprises one or more than one detection branch, described detection branch comprises anodal insulation against ground resistance R LP and negative pole insulation against ground resistance R LN, when the anodal insulation against ground resistance R LP of detection branch or negative pole insulation against ground resistance R LN occur to reduce, by reading the output voltage of leakage current sensor H1, the size of detection branch leakage current can be obtained, thereby the size of branch road insulating resistance value can be calculated.
After this example powers on, detect the bus insulation resistance value by unbalanced electric bridge first, it is the insulating resistance value that bus unbalanced bridge detecting unit detects positive and negative busbar, if the bus insulation resistance value is greater than certain value, then disconnect the fling-cut switch of unbalanced bridge, described fling-cut switch comprises positive bus-bar fling-cut switch K1 and negative busbar fling-cut switch K2, and record respectively the output current value of the leakage current sensor H1 of every detection branch, be used as the drift record of every detection branch leakage current sensor H1 with this; When start branch road insulation detecting unit next time, the output valve of the leakage current sensor H1 of every detection branch that sampling is obtained deducts the drift numerical value of last registration, with this as final leakage current numerical value, just can effectively eliminate the drift problem of leakage current sensor H1, improve the precision that insulation detects.
Compared with prior art, this example provides a kind of insulation of DC power-supply system to detect the drift automatic correction device, can realize the drift automatic calibration by the insulate leakage current sensor H1 of detecting unit of branch road, effectively eliminated the drift problem of leakage current sensor H1, improve the precision that insulation detects, simple in structure, be easy to realize.
The insulation of the DC power-supply system that this example proposes detects the drift automatic correction device, its workflow diagram as shown in Figure 2, the just leakage current sensor H1 that the circle among Fig. 2 represents, this expression mode is general in the industry.
The first step: calculate first bus insulation resistance, concrete grammar is as follows: positive bus-bar fling-cut switch K1 is closed, and negative busbar fling-cut switch K2 disconnects, sampling positive bus-bar voltage-to-ground U1, negative busbar voltage-to-ground U2; And then with positive bus-bar fling-cut switch K1 disconnection, negative busbar fling-cut switch K2 is closed, sampling positive bus-bar voltage-to-ground U3, negative busbar voltage-to-ground U4; For ease of calculating, this example is preferably, and positive bus-bar switching resistance R 1=negative busbar switching resistance R 2 is according to formula: positive bus-bar insulation against ground resistance R P=
, negative busbar insulation against ground resistance R N=
Calculate positive and negative busbar insulation against ground resistance value.
Second step: judge that whether the value of positive bus-bar insulation against ground resistance R P, negative busbar insulation against ground resistance R N is greater than the first parameters R 0, the large I of the first parameters R 0 is according to the actual conditions setting, the first parameters R 0 value is generally 400K Ω ~ 1000K Ω, and R0 gets 500 K Ω in the implementation case.If the resistance of positive bus-bar insulation against ground resistance R P, negative busbar insulation against ground resistance R N then started for the 3rd step all greater than the first parameters R 0.If positive bus-bar insulation against ground resistance R P, negative busbar insulation against ground resistance R N then send the insulation alarm less than bus insulation alert settings value.
The 3rd step: disconnect positive bus-bar fling-cut switch K1 and the negative busbar fling-cut switch K2 of unbalanced bridge, the leakage current sensor output numerical value of every the branch road of sampling successively, and preserve.Leakage current sensor H1 and bus unbalanced bridge detecting unit annexation are seen Fig. 1.
The 4th step: the insulating resistance value of positive and negative busbar is calculated in sampling according to the method for the first step again, and calculates numerical value with first step sampling and compare.If the insulating resistance value of the positive and negative busbar that double sampling calculates differs absolute value and is no more than the second parameters R S, think that then the bus insulation resistance does not change in the process that gathers the branch road leakage current, namely the leakage current numerical value of each bar branch road of the 3rd step preservation is effective, otherwise needs again from the first step.The large I of the second parameters R S is according to the actual conditions setting, and the second parameters R S value is generally 50K Ω ~ 100K Ω, and the second parameters R S gets 50 K Ω in the implementation case.
When next start detection branch road insulate when detecting, the output valve of the leakage current sensor H1 of every detection branch that sampling is obtained deducts the drift numerical value of last registration, with this as final leakage current numerical value.
Therefore the drift meeting of leakage current sensor H1, need to regularly upgrade the drift record with some variations of the different existence of environment.Generally again proofread and correct once at set intervals, interval time, T can set according to actual needs.
The resistance of this routine described positive bus-bar switching resistance R 1 and negative busbar switching resistance R 2 equates.Wherein, the resistance of described positive bus-bar switching resistance R 1 and negative busbar switching resistance R 2 equates, is convenient to the insulating resistance value that bus unbalanced bridge detecting unit detects positive and negative busbar, also is convenient to the calculating to the drift value of leakage current sensor H1.
Embodiment 2:
On the basis of embodiment 1, this routine described branch road insulation detecting unit comprises the detection branch of one or more, and every detection branch all comprises a leakage current sensor H1.In the described road insulation detecting unit, comprise one or more than one detection branch, the quantity of described detection branch can arrange according to actual conditions, and every detection branch comprises a leakage current sensor H1, and wherein the both positive and negative polarity of detection branch all will pass leakage current sensor H1; When the anodal insulation against ground resistance R LP of detection branch or negative pole insulation against ground resistance R LN generation reduction, by reading the output voltage of leakage current sensor H1, just the size of this detection branch leakage current can be obtained, thereby the size of outlet insulation detecting unit insulating resistance value can be calculated.
Embodiment 3:
On the basis of embodiment 1 or embodiment 2, this routine described positive bus-bar fling-cut switch K1 and negative busbar fling-cut switch K2 are relay.Preferably, described relay is solid-state relay.Can realize well the break-make of positive and negative busbar by relay, guarantee that bus unbalanced bridge detecting unit detects the insulating resistance value of positive and negative busbar; Described relay is preferably solid-state relay, described solid-state relay also claims solid-state relay, English name is Solid State Relay, be called for short SSR, it is the switching device shifter that replaces the traditional electrical contact with semiconductor devices, belong to the noncontacting switch device with relay characteristic, simplified control procedure.
Embodiment 4:
On the basis of embodiment 1 or embodiment 2, this routine described positive bus-bar fling-cut switch K1 and negative busbar fling-cut switch K2 are electronic switch.Electronic switch refers to utilize power electronic devices to realize the operation unit of connecting and disconnecting of the circuit, comprises at least a controlled electronic valve device, can promote the break-make control to positive and negative busbar, realizes that the insulating resistance value of positive and negative busbar detects.
This routine beneficial effect is, provide a kind of insulation of DC power-supply system to detect the drift automatic correction device, can cooperatively interact by insulate leakage current sensor H1 and the bus unbalanced bridge detecting unit of detecting unit of branch road, to realize the drift automatic calibration, effectively eliminated the drift problem of leakage current sensor H1, improve the precision that insulation detects, this example is simple in structure, is easy to realize.
The embodiment of the above is preferred embodiments of the present utility model; be not to limit implementation scope of the present utility model with this; scope of the present utility model comprises and is not limited to this embodiment that the equivalence that all shapes according to the utility model, structure are done changes all in protection domain of the present utility model.
Claims (7)
1. the insulation of a DC power-supply system detects the drift automatic correction device, it is characterized in that, comprising:
Bus unbalanced bridge detecting unit, described bus unbalanced bridge detecting unit comprises positive bus-bar switching resistance, positive bus-bar fling-cut switch, negative busbar switching resistance and negative busbar fling-cut switch, described positive bus-bar switching resistance is connected in series mutually with the positive bus-bar fling-cut switch, and described negative busbar switching resistance is connected in series mutually with the negative busbar fling-cut switch; And,
Branch road insulation detecting unit, described branch road insulation detecting unit comprises leakage current sensor, described leakage current sensor is connected with the both positive and negative polarity of branch road insulation detecting unit.
2. the insulation of DC power-supply system according to claim 1 detects the drift automatic correction device, it is characterized in that, described branch road insulation detecting unit comprises the detection branch more than at least one, and every detection branch all comprises a leakage current sensor.
3. the insulation of DC power-supply system according to claim 1 detects the drift automatic correction device, it is characterized in that, the resistance of described positive bus-bar switching resistance and negative busbar switching resistance equates.
4. the insulation of DC power-supply system according to claim 3 detects the drift automatic correction device, it is characterized in that, described branch road insulation detecting unit comprises the detection branch of one or more, and every detection branch all comprises a leakage current sensor.
5. according to claim 1 to the insulation detection drift automatic correction device of the described DC power-supply system of 4 any one, it is characterized in that described positive bus-bar fling-cut switch and negative busbar fling-cut switch are relay.
6. the insulation of DC power-supply system according to claim 5 detects the drift automatic correction device, it is characterized in that described relay is solid-state relay.
7. according to claim 1 to the insulation detection drift automatic correction device of the described DC power-supply system of 4 any one, it is characterized in that described positive bus-bar fling-cut switch and negative busbar fling-cut switch are electronic switch.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103389444A (en) * | 2013-07-24 | 2013-11-13 | 中达电通股份有限公司 | Switching type insulation monitoring error self-adapting method based on voltage prediction |
| CN104678264A (en) * | 2013-11-30 | 2015-06-03 | 中国科学院沈阳自动化研究所 | Online insulation detection and fault processing device and method of AUV (Autonomous Underwater Vehicle) direct-current power supply system |
| CN106546934A (en) * | 2015-09-18 | 2017-03-29 | 比亚迪股份有限公司 | Zero shift rectifying method and apparatus when current of electric is sampled |
| CN106771901A (en) * | 2016-11-28 | 2017-05-31 | 东北电力大学 | Based on the DC system insulating monitoring method for determining frequency switching resistance principle |
| CN108398644A (en) * | 2018-01-30 | 2018-08-14 | 南京理工大学 | A kind of power battery of pure electric automobile Insulation Inspection System and method |
| CN108508400A (en) * | 2018-03-30 | 2018-09-07 | 浙江省星炬科技有限公司 | Correction method is reviewed one's lessons by oneself in direct current instrument transformer null offset in a kind of DC system insulating monitoring instrument |
| CN110967662A (en) * | 2019-12-24 | 2020-04-07 | 国网山东省电力公司烟台供电公司 | Calibration method of DC leakage current sensor for insulation monitoring of DC system |
| CN113125837A (en) * | 2021-04-16 | 2021-07-16 | 奇瑞商用车（安徽）有限公司 | Current sampling zero drift processing method and system |
| CN116299045A (en) * | 2023-03-24 | 2023-06-23 | 长沙广义变流技术有限公司 | A detection circuit and detection method for leakage current and insulation resistance of high-voltage equipment |
| CN117907915A (en) * | 2024-01-18 | 2024-04-19 | 南京国电南自电网自动化有限公司 | Zero drift measurement and compensation method and system of leakage current sensor for insulation monitoring |
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2012
- 2012-06-18 CN CN 201220285820 patent/CN202676898U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103389444A (en) * | 2013-07-24 | 2013-11-13 | 中达电通股份有限公司 | Switching type insulation monitoring error self-adapting method based on voltage prediction |
| CN103389444B (en) * | 2013-07-24 | 2016-02-03 | 中达电通股份有限公司 | Based on the switching type insulating monitoring error adaptive approach of voltage prediction |
| CN104678264A (en) * | 2013-11-30 | 2015-06-03 | 中国科学院沈阳自动化研究所 | Online insulation detection and fault processing device and method of AUV (Autonomous Underwater Vehicle) direct-current power supply system |
| CN104678264B (en) * | 2013-11-30 | 2017-12-15 | 中国科学院沈阳自动化研究所 | The online Insulation monitoring of AUV DC power-supply systems and fault treating apparatus and method |
| CN106546934A (en) * | 2015-09-18 | 2017-03-29 | 比亚迪股份有限公司 | Zero shift rectifying method and apparatus when current of electric is sampled |
| CN106771901A (en) * | 2016-11-28 | 2017-05-31 | 东北电力大学 | Based on the DC system insulating monitoring method for determining frequency switching resistance principle |
| CN108398644A (en) * | 2018-01-30 | 2018-08-14 | 南京理工大学 | A kind of power battery of pure electric automobile Insulation Inspection System and method |
| CN108508400A (en) * | 2018-03-30 | 2018-09-07 | 浙江省星炬科技有限公司 | Correction method is reviewed one's lessons by oneself in direct current instrument transformer null offset in a kind of DC system insulating monitoring instrument |
| CN110967662A (en) * | 2019-12-24 | 2020-04-07 | 国网山东省电力公司烟台供电公司 | Calibration method of DC leakage current sensor for insulation monitoring of DC system |
| CN113125837A (en) * | 2021-04-16 | 2021-07-16 | 奇瑞商用车（安徽）有限公司 | Current sampling zero drift processing method and system |
| CN116299045A (en) * | 2023-03-24 | 2023-06-23 | 长沙广义变流技术有限公司 | A detection circuit and detection method for leakage current and insulation resistance of high-voltage equipment |
| CN117907915A (en) * | 2024-01-18 | 2024-04-19 | 南京国电南自电网自动化有限公司 | Zero drift measurement and compensation method and system of leakage current sensor for insulation monitoring |
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