CN102998536A - Highly-reliable detection method for insulation resistance of direct-current buses - Google Patents
Highly-reliable detection method for insulation resistance of direct-current buses Download PDFInfo
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- CN102998536A CN102998536A CN2012104233957A CN201210423395A CN102998536A CN 102998536 A CN102998536 A CN 102998536A CN 2012104233957 A CN2012104233957 A CN 2012104233957A CN 201210423395 A CN201210423395 A CN 201210423395A CN 102998536 A CN102998536 A CN 102998536A
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Abstract
The invention relates to the technical field of detection methods for insulation resistance of direct-current buses, in particular to a highly-reliable detection method for insulation resistance of direct-current buses. The detection method includes under the condition that power supply of a positive bus and a negative bus is normal, acquiring voltage Vx between the positive bus and a ground wire or voltage Vy between the negative bus and the ground wire when an unbalanced bridge and the ground wire are disconnected, and acquiring voltage Vx1 between the positive wire and the ground wire or voltage Vy1 between the positive bus and the ground wire when the unbalanced bridge and the ground wire are connected. The detection method is characterized in that whether the ground wire is abnormally grounded or not is judged according to whether Vx1 is equal to Vx or not, or Vy1 is equal to Vy or not, and accordingly detection for grounded condition of the ground wire is achieved and detection reliability of a system is increased. In addition, extra complex steps or circuits need not be added, a judging step needs to be added only, and the method is simple and easy to implement.
Description
Technical field
The present invention relates to the dc bus insulation resistance detection method of dc bus insulation resistance detection method technical field, particularly a kind of high reliability.The method is finished by computer program instructions control computer system by setting up functional module construction.
Background technology
The dc bus insulativity descends and dc bus ground connection is the DC power system most common failure, therefore need in time to grasp the DC power system bus insulating property, when the dc bus insulation resistance dropped to setting value, Insulation Inspection System is the notice host computer in time, sends sound and light alarm etc.Existing detection method has the bridge balance detection method, but the situation that the method positive and negative busbar insulating resistance is descended in proportion is helpless.Therefore, derived " balance-imbalance " electric bridge detection method.For " balance-imbalance " electric bridge detection method, generally be that the access balanced bridge detects in circuit, increasing non-equilibrium bridge on the basis of balance bridge after the balance bridge detection is finished detects, there are equally some problems for this a kind of detection method: in current detecting, generally do not detect in advance ground wire and whether disconnect or have earth fault, and when ground wire does not have normal ground connection, the bus insulation resistance value of calculating by conventional method is infinitely great, so can not reflect the bus insulation situation of DC power system fully.Therefore the ground wire Grounding is judged in testing process it is very important.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can effectively judge ground wire grounded situation, improve the dc bus insulation resistance detection method of detecting reliability.
Purpose of the present invention is achieved through the following technical solutions:
A kind of dc bus insulation resistance detection method of high reliability is provided, comprise step: under positive bus-bar and negative busbar are powered normal situation, voltage Vx when obtaining the voltage non-zero points of non-equilibrium bridge and ground wire and disconnecting between positive bus-bar and the ground wire or the voltage Vy between negative busbar and the ground wire, and the voltage non-zero points of obtaining non-equilibrium bridge the voltage Vx1 between positive bus-bar and the ground wire or the voltage Vy1 between negative busbar and the ground wire when being connected with ground wire, it is characterized in that: whether equal Vx or Vy1 according to Vx1 and whether equal Vy and judge whether normal ground connection of ground wire.
Wherein, voltage Vx when disconnecting between the voltage non-zero points of described non-equilibrium bridge and the ground wire between positive bus-bar and the ground wire and the acquisition methods of the voltage Vy between negative busbar and the ground wire are: obtain voltage V between the positive and negative busbar and the voltage Vy between negative busbar and the ground wire, described Vx=V-|Vy|; Voltage Vx1 when being connected between the voltage non-zero points of described non-equilibrium bridge and the ground wire between positive bus-bar and the ground wire and the acquisition methods of the voltage Vy1 between negative busbar and the ground wire are: obtain voltage V between the positive and negative busbar and the voltage Vy1 between negative busbar and the ground wire, described Vx1=V-|Vy1|.
Repeatedly sample when the voltage Vx when wherein, between the voltage non-zero points of obtaining non-equilibrium bridge and ground wire, disconnecting between positive bus-bar and the ground wire and the voltage Vy between negative busbar and the ground wire and average; Repeatedly sample when the voltage Vx1 when between the voltage non-zero points of obtaining non-equilibrium bridge and ground wire, being connected between positive bus-bar and the ground wire and the voltage Vy1 between negative busbar and the ground wire and average.
Beneficial effect of the present invention: a kind of dc bus insulation resistance detection method is provided, carry out non-equilibrium bridge after there is not ground short circuit in bus and detect in that judgement is finished, and the voltage data that (balance bridge and ground wire disconnection) obtains before non-equilibrium bridge detected the voltage data that obtains detecting with non-equilibrium bridge compares, if there is not variation in data, can judge that ground wire does not have normal ground connection, realization is to the detection of ground wire Grounding, the reliability that the raising system detects.In addition, the voltage data that this method employing voltage data that (non-equilibrium bridge detects front) obtains when judging the positive and negative busbar Grounding and balance bridge obtain when detecting compares, therefore do not need and outer step or the circuit that increases complexity, only need to increase a determining step, method is easy, is easy to realize.
Embodiment
The invention will be further described with the following Examples.
The embodiment of the dc bus insulation resistance detection method of a kind of high reliability of the present invention comprises step:
(1) disconnect being connected of non-equilibrium bridge and ground wire, obtain this moment positive bus-bar and ground wire between voltage Vx and the voltage Vy between negative busbar and the ground wire, according to Vx and Vy judgement positive and negative busbar Grounding;
(2) the non-equilibrium bridge of conducting and ground wire is connected, obtain voltage Vx1 between this moment positive bus-bar and ground wire and the voltage Vy1 between negative busbar and the ground wire, judge whether Vx1=Vx or Vy1=Vy, then can judge in this way the abnormal ground connection of ground wire, can stop to detect and reporting to the police, as no, then judge and can judge the normal ground connection of ground wire, can preserve Vx1 and Vy1 data and carry out next step;
(3) being connected of conducting balance bridge and bus disconnects being connected of non-equilibrium bridge and ground wire, obtain this moment positive bus-bar and ground wire between voltage Vx2 and the voltage Vy2 between negative busbar and the ground wire, preserve Vx2 and Vy2 data and also carry out next step;
(4) utilize resistance value calculating positive bus-bar known in Vx1, Vy1, Vx2 and Vy2 and the circuit and the insulation resistance Rx between the ground wire and the voltage insulation resistance R y between negative busbar and the ground wire.
In the present embodiment, voltage Vx between positive bus-bar and the ground wire and the voltage Vy between negative busbar and the ground wire have been obtained when judging the positive and negative busbar Grounding in the step (1), carry out having obtained when non-equilibrium bridge detects voltage Vx1 between positive bus-bar and the ground wire and the voltage Vy1 between negative busbar and the ground wire in the step (2), owing to the be connected disconnection of non-equilibrium bridge in step 1 with ground wire, non-equilibrium bridge and ground conductive in step (2), therefore step (2) is with respect to step (1): if ground wire grounded normal, the resistance value between positive bus-bar and the ground wire then, variation must all occur in the resistance value between negative busbar and the ground wire, so and because the resistance value of the upper brachium pontis of non-equilibrium bridge and unequal two resistance values of lower arm resistance value can not be the equal proportion variations, and then the voltage Vx between positive bus-bar and the ground wire and the voltage Vy between negative busbar and the ground wire must change.Otherwise if ground wire grounded undesired, then the voltage Vx between positive bus-bar and the ground wire and the voltage Vy between negative busbar and the ground wire can not change.Therefore judge whether Vx1 equals Vx or Vy1 and whether equal Vy and can judge whether normal ground connection of ground wire, thereby realized the whether detection of normal ground connection of ground wire so that find the ground connection abnormal conditions, has been improved accuracy and reliability that entire system detects.The inventive method need not extra image data simultaneously, more need not to revise the circuit of existing pick-up unit, only relies on the data in existing the detection simply to judge, is easy to realize.
In the step (1) of present embodiment, by the voltage V between the detection positive and negative busbar and the voltage Vy between negative busbar and the ground wire, repeatedly sample simultaneously according to the voltage Vx between Vx=V-|Vy| acquisition positive bus-bar and the ground wire simultaneously and obtain a plurality of Vx values and a plurality of Vy value, the mean value of obtaining respectively them both had been final Vx and Vy; In like manner, in step (2) and step (3), take same method can obtain Vx1, Vy1, Vx2 and Vy2.
The method that this paper provides, all or part of step wherein can by setting up functional module construction, be finished by computer program instructions control computer system.These computer program instructions are stored in the computer-readable recording medium.
Claims (6)
1. the dc bus insulation resistance detection method of a high reliability, comprise step: under positive bus-bar and negative busbar are powered normal situation, voltage Vx when obtaining the voltage non-zero points of non-equilibrium bridge and ground wire and disconnecting between positive bus-bar and the ground wire or the voltage Vy between negative busbar and the ground wire, and the voltage non-zero points of obtaining non-equilibrium bridge the voltage Vx1 between positive bus-bar and the ground wire or the voltage Vy1 between negative busbar and the ground wire when being connected with ground wire, it is characterized in that: whether equal Vx or Vy1 according to Vx1 and whether equal Vy and judge whether normal ground connection of ground wire.
2. the dc bus insulation resistance detection method of a kind of high reliability according to claim 1, it is characterized in that: the voltage Vx when disconnecting between the voltage non-zero points of described non-equilibrium bridge and the ground wire between positive bus-bar and the ground wire and the acquisition methods of the voltage Vy between negative busbar and the ground wire are: obtain voltage V between the positive and negative busbar and the voltage Vy between negative busbar and the ground wire, described Vx=V-|Vy|; Voltage Vx1 when being connected between the voltage non-zero points of described non-equilibrium bridge and the ground wire between positive bus-bar and the ground wire and the acquisition methods of the voltage Vy1 between negative busbar and the ground wire are: obtain voltage V between the positive and negative busbar and the voltage Vy1 between negative busbar and the ground wire, described Vx1=V-|Vy1|.
3. the dc bus insulation resistance detection method of a kind of high reliability according to claim 1 and 2 is characterized in that: repeatedly sample when the voltage Vx when disconnecting between the voltage non-zero points of obtaining non-equilibrium bridge and ground wire between positive bus-bar and the ground wire and the voltage Vy between negative busbar and the ground wire and average; Repeatedly sample when the voltage Vx1 when between the voltage non-zero points of obtaining non-equilibrium bridge and ground wire, being connected between positive bus-bar and the ground wire and the voltage Vy1 between negative busbar and the ground wire and average.
4. the dc bus insulation resistance detection device of a high reliability, being included in positive bus-bar and negative busbar powers in the normal situation, voltage Vx when obtaining the voltage non-zero points of non-equilibrium bridge and ground wire and disconnecting between positive bus-bar and the ground wire or the voltage Vy between negative busbar and the ground wire, and the voltage non-zero points of obtaining non-equilibrium bridge the voltage Vx1 between positive bus-bar and the ground wire or the device A of the voltage Vy1 between negative busbar and the ground wire when being connected with ground wire, it is characterized in that: comprise also whether not whether whether equal Vx or Vy1 according to Vx1 equals Vy and judge the ground wire device B of normal ground connection.
5. the dc bus insulation resistance detection device of a kind of high reliability according to claim 1, it is characterized in that: described device A comprises the voltage Vx between the positive bus-bar and ground wire and the device A1 of the voltage Vy between negative busbar and the ground wire when disconnecting between the voltage non-zero points of obtaining non-equilibrium bridge and the ground wire: obtain voltage V between the positive and negative busbar and the voltage Vy between negative busbar and the ground wire, described Vx=V-|Vy|; Voltage Vx1 when being connected between the voltage non-zero points of obtaining non-equilibrium bridge and the ground wire between positive bus-bar and the ground wire and the device A2 of the voltage Vy1 between negative busbar and the ground wire: obtain voltage V between the positive and negative busbar and the voltage Vy1 between negative busbar and the ground wire, described Vx1=V-|Vy1|.
6. the dc bus insulation resistance detection method of a kind of high reliability according to claim 1 and 2 is characterized in that: deriving means A1 repeatedly samples when obtaining when disconnecting between non-equilibrium bridge and the ground wire voltage Vx between the positive bus-bar and ground wire and the voltage Vy between negative busbar and the ground wire and averages; Deriving means A2 repeatedly samples when obtaining between non-equilibrium bridge and the ground wire when disconnecting the voltage Vx1 between the positive bus-bar and ground wire and the voltage Vy1 between negative busbar and the ground wire and averages.
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| CN201210423395.7A CN102998536B (en) | 2012-10-30 | 2012-10-30 | A kind of DC bus insulation resistance detection method of high reliability |
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| CN201210423395.7A CN102998536B (en) | 2012-10-30 | 2012-10-30 | A kind of DC bus insulation resistance detection method of high reliability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738752A (en) * | 2016-04-20 | 2016-07-06 | 云南云铝涌鑫铝业有限公司 | Grounding detection apparatus and detection method for electrolytic DC system |
| CN112666435A (en) * | 2020-12-01 | 2021-04-16 | 西安麦格米特电气有限公司 | Insulation detection design method for automobile charging system facing booster circuit |
| TWI802331B (en) * | 2022-03-22 | 2023-05-11 | 新普科技股份有限公司 | An insulation resistance detecting equipment and detecting method thereof |
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| CN101216543A (en) * | 2008-01-04 | 2008-07-09 | 广东省电力工业局试验研究所 | DC system earth fault detection and calibration method and its special equipment |
| CN101261301A (en) * | 2008-04-18 | 2008-09-10 | 南车株洲电力机车有限公司 | Locomotive control loop grounding detection circuit and grounding detection method and wire break detection method |
| CN201335868Y (en) * | 2008-12-29 | 2009-10-28 | 株洲电力机车厂长河机电产品开发公司 | Insulation monitor for DC (direct current) network |
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2012
- 2012-10-30 CN CN201210423395.7A patent/CN102998536B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216543A (en) * | 2008-01-04 | 2008-07-09 | 广东省电力工业局试验研究所 | DC system earth fault detection and calibration method and its special equipment |
| CN101261301A (en) * | 2008-04-18 | 2008-09-10 | 南车株洲电力机车有限公司 | Locomotive control loop grounding detection circuit and grounding detection method and wire break detection method |
| CN201335868Y (en) * | 2008-12-29 | 2009-10-28 | 株洲电力机车厂长河机电产品开发公司 | Insulation monitor for DC (direct current) network |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105738752A (en) * | 2016-04-20 | 2016-07-06 | 云南云铝涌鑫铝业有限公司 | Grounding detection apparatus and detection method for electrolytic DC system |
| CN105738752B (en) * | 2016-04-20 | 2019-04-30 | 云南云铝涌鑫铝业有限公司 | Electrolysis direct current system ground detection device and detection method |
| CN112666435A (en) * | 2020-12-01 | 2021-04-16 | 西安麦格米特电气有限公司 | Insulation detection design method for automobile charging system facing booster circuit |
| CN112666435B (en) * | 2020-12-01 | 2024-03-12 | 西安麦格米特电气有限公司 | Insulation detection design method of automobile charging system facing booster circuit |
| TWI802331B (en) * | 2022-03-22 | 2023-05-11 | 新普科技股份有限公司 | An insulation resistance detecting equipment and detecting method thereof |
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