CN203909213U - Photovoltaic direct current 1000V insulation monitoring device - Google Patents

Photovoltaic direct current 1000V insulation monitoring device Download PDF

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Publication number
CN203909213U
CN203909213U CN201420172141.7U CN201420172141U CN203909213U CN 203909213 U CN203909213 U CN 203909213U CN 201420172141 U CN201420172141 U CN 201420172141U CN 203909213 U CN203909213 U CN 203909213U
Authority
CN
China
Prior art keywords
electrically
monitoring
leakage
bus
insulation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420172141.7U
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Chinese (zh)
Inventor
卫卓明
徐华
王保华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Jinting New Energy Technology Co.,Ltd.
Original Assignee
Shenzhen Jinting Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to CN201420172141.7U priority Critical patent/CN203909213U/en
Application granted granted Critical
Publication of CN203909213U publication Critical patent/CN203909213U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a photovoltaic direct current 1000V insulation monitoring device, comprising a difference current detection circuit, a plurality of leakage resistors, a plurality of leakage current sensors, a plurality of load branches, an insulation monitoring instrument and a background monitoring system. The difference current detection circuit is electrically connected with a bus. Each load branch is electrically connected with the bus through one leakage current sensor, one end of the leakage resistor is connected on an electrical connection line between the load branch and the leakage current sensor, and the other end of the leakage resistor is grounded. The difference current detection circuit and the leakage current sensors are electrically connected with the insulation monitoring instrument, and the insulation monitoring instrument is electrically connected with the background monitoring system. According to the photovoltaic direct current 1000V insulation monitoring device, the difference current detection circuit and the leakage resistors are provided to achieve real-time monitoring of insulation conditions of the bus and the branches; and according to related detection information, the resistance value of the bus or each branch to the earth can be calculated, a branch of insulation faults can be positioned rapidly, and a corresponding alarm prompt message can be generated, so that tedious manual polling can be prevented.

Description

Photovoltaic DC 1000V insulation monitoring and warning device
Technical field
The utility model relates to insulation monitoring and warning device field, relates in particular to a kind of photovoltaic DC 1000V insulation monitoring and warning device.
Background technology
Existing insulating monitoring instrument needs testing staff at the scene faulty line to be investigated one by one mostly, and this takes time and effort the maintenance of high voltage direct current electric power system; And artificial mode can not be found the circuit with handling failure timely, also easily there is human error, bury very dark hidden danger to the security of electric power system.In addition, the instrument of existing Real-Time Monitoring electric power system dielectric strength is to adopt the mode of injecting low-frequency ac signal to measure mostly, its metering system is subject to the impact of the distributed capacitance in circuit very much, thereby affects measuring accuracy, and also greatly increases on cost.
Utility model content
For the weak point existing in above-mentioned technology, it is a kind of simple in structure that the utility model provides, and can greatly simplify the insulation monitoring and warning device of the work of patrolling and examining.
For achieving the above object, the utility model provides a kind of photovoltaic DC 1000V insulation monitoring and warning device, comprises poor current detection circuit, multiple leakage resistance, multiple leakage current sensor, multiple load branch, insulating monitoring instrument and background monitoring system; Described poor current detection circuit is electrically connected with bus; Described each load branch is electrically connected with bus by a leakage current sensor, and described leakage resistance one end is connected on the electric connection line between load branch and leakage current sensor, other end ground connection; Described poor current detection circuit, leakage current sensor are all electrically connected with insulating monitoring instrument, and described insulating monitoring instrument is electrically connected with background monitoring system.
Wherein, described poor current detection circuit comprises the first balance resistance, the second balance resistance, the first voltage transmitter and second voltage transmitter, and bus comprises positive bus-bar and negative busbar;
Described first balance resistance one end is electrically connected with positive bus-bar, other end ground connection, and the two ends of the first balance resistance are also electrically connected with the first voltage transmitter; The first voltage transmitter is also electrically connected with insulating monitoring instrument;
Described second balance resistance one end is electrically connected with negative busbar, other end ground connection, and the two ends of the second balance resistance are also electrically connected with second voltage transmitter, and second voltage transmitter is also electrically connected with insulating monitoring instrument.
Wherein, described leakage current sensor is non-contact type high voltage DC leakage current sensor, and the measuring accuracy of leakage current sensor is mA level.
Wherein, described background monitoring system is provided with the Chinese LCDs for showing various monitoring parameters.
The beneficial effects of the utility model are: compared with prior art, the photovoltaic DC 1000V insulation monitoring and warning device that the utility model provides, be provided with poor current detection circuit and leakage current sensor, poor current detection circuit can detect the difference that flows into bus and flow out the electric current of bus, and leakage current sensor can detect the difference of the inflow of the positive negative conductor of a certain load branch and the electric current of outflow; And then the insulation status of on-line real time monitoring bus and branch road, and according to relevant detection information, calculate bus or branch road resistance value over the ground, be positioned to fast the branch road that occurs insulation fault, and produce corresponding prompt messages, corresponding information is uploaded to background monitoring system, maintainer only need check in pulpit that relevant information is known faulty line place place simultaneously, and having avoided loaded down with trivial details people is the work of patrolling and examining.Photovoltaic DC 1000V insulation monitoring and warning device of the present utility model, has simplified the work of patrolling and examining greatly, has reduced the cost of labor of equipment routing inspection; The utility model is simple in structure, and production cost is low, has economic advantages.
Brief description of the drawings
Fig. 1 is the block diagram of photovoltaic DC 1000V insulation monitoring and warning device of the present utility model.
Main element symbol description is as follows:
1, bus 11, positive bus-bar
12, negative busbar 2, poor current detection circuit
21, the first balance resistance 22, the second balance resistance
23, the first voltage transmitter 24, second voltage transmitter
3, leakage current sensor 4, load branch
5, leakage resistance 6, insulating monitoring instrument
7, background monitoring system 8, ground
Embodiment
In order more clearly to explain the utility model, below in conjunction with accompanying drawing, the utility model is further described.
Refer to Fig. 1, the photovoltaic DC 1000V insulation monitoring and warning device that the utility model provides, comprises poor current detection circuit 2, multiple leakage resistance 5, multiple leakage current sensor 3, multiple load branch 4, insulating monitoring instrument 6 and background monitoring system 7; Poor current detection circuit 2 is electrically connected with bus 1; Each load branch 4 is electrically connected with bus 1 by a leakage current sensor 3, and leakage resistance 5 one end are connected on the electric connection line between load branch 4 and leakage current sensor 3, and the other end is electrically connected with ground 8; Poor current detection circuit 2, leakage current sensor 3 are all electrically connected with insulating monitoring instrument 6, and insulating monitoring instrument 6 is electrically connected with background monitoring system 7.
Compared to prior art, the photovoltaic high voltage direct current 1000V insulation monitoring and warning device that the utility model provides, be provided with poor current detection circuit 2 and leakage current sensor 3, poor current detection circuit 2 can detect the difference that flows into bus 1 and flow out the electric current of bus 1, and leakage current sensor 3 can detect the difference of the positive inflow of negative conductor of a certain load branch 4 and the electric current of outflow; And then the insulation status of on-line real time monitoring bus 1 and branch road, and according to relevant detection information, calculate bus 1 or branch road resistance value over the ground, be positioned to fast the branch road that occurs insulation fault, and produce corresponding prompt messages, corresponding information is uploaded to background monitoring system 7, maintainer only need check in pulpit that relevant information is known faulty line place place simultaneously, and having avoided loaded down with trivial details people is the work of patrolling and examining.Photovoltaic DC 1000V insulation monitoring and warning device of the present utility model, protection equipment and personal safety, simplified the work of patrolling and examining greatly, reduced the cost of labor of equipment routing inspection; The utility model adopts poor stream detection method, the insulation status of Real-Time Monitoring DC power-supply system, and measurement data is accurate, reduces the localization of fault maintenance difficulties of electric power system, saves cost, improves the safe reliability of system; The utility model is simple in structure, and production cost is low, has economic advantages.
The photovoltaic DC 1000V insulation monitoring and warning device that the utility model provides, poor current detection circuit 2 comprises the first balance resistance 21, the second balance resistance 22, the first voltage transmitter 23 and second voltage transmitter 24, bus 1 comprises positive bus-bar 11 and negative busbar 12; First balance resistance 21 one end are electrically connected with positive bus-bar 11, and the other end is electrically connected with ground 8, and the two ends of the first balance resistance 21 are also electrically connected with the first voltage transmitter 23; The first voltage transmitter 23 is also electrically connected with insulating monitoring instrument 6; Second balance resistance 22 one end are electrically connected with negative busbar 12, and the other end is electrically connected with ground 8, and the two ends of the second balance resistance 22 are also electrically connected with second voltage transmitter 24, and second voltage transmitter 24 is also electrically connected with insulating monitoring instrument 6.The first voltage transmitter 23 and the first balance resistance 21 co-operation, for measuring the work electrical quantity of positive bus-bar 11, to calculate the current value of the positive bus-bar 11 of flowing through according to measurement electrical quantity; Second voltage transmitter 24 and the second balance resistance 22 co-operation, for measuring the work electrical quantity of negative busbar 12, to calculate the current value of the positive bus-bar 11 of flowing through according to measurement electrical quantity.The effect of poor current detection circuit 2 is to measure the inflow of positive bus-bar 11 and negative busbar 12 and the difference that flows out electric current, and measurement result, after insulating monitoring instrument 6 is processed, demonstrates fault judged result.
The photovoltaic DC 1000V insulation monitoring and warning device that the utility model provides, leakage current sensor 3 is non-contact type high voltage DC leakage current sensor 3, the measuring accuracy of leakage current sensor 3 is mA level.Adopt the mode of injecting low-frequency ac signal to measure different from the instrument of existing Real-Time Monitoring electric power system dielectric strength, the utility model adopts non-contact type high voltage DC leakage current sensor 3, metering system is not subject to the impact of the distributed capacitance in circuit, can not affect measuring accuracy, therefore measuring accuracy is very high, can reach mA level, and also greatly reduce on cost.
The photovoltaic DC 1000V insulation monitoring and warning device that the utility model provides, background monitoring system 7 is provided with the Chinese LCDs for showing various monitoring parameters.The utility model adopts the mode of Chinese liquid crystal display to show parameters value, user only needs can operate on it according to the prompting showing, Chinese LCDs can reduce operation easier, reduces the professional requirement to operating personnel, is conducive to promoting the use of of product.Certainly this only belongs to a specific embodiment of the present utility model, and display mode of the present utility model is not limited in this.
Disclosed is above only several specific embodiment of the present utility model, but the utility model is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection domain of the present utility model.

Claims (4)

1. a photovoltaic DC 1000V insulation monitoring and warning device, is characterized in that, comprises poor current detection circuit, multiple leakage resistance, multiple leakage current sensor, multiple load branch, insulating monitoring instrument and background monitoring system; Described poor current detection circuit is electrically connected with bus; Described each load branch is electrically connected with bus by a leakage current sensor, and described leakage resistance one end is connected on the electric connection line between load branch and leakage current sensor, other end ground connection; Described poor current detection circuit, leakage current sensor are all electrically connected with insulating monitoring instrument, and described insulating monitoring instrument is electrically connected with background monitoring system.
2. photovoltaic DC 1000V insulation monitoring and warning device according to claim 1, it is characterized in that, described poor current detection circuit comprises the first balance resistance, the second balance resistance, the first voltage transmitter and second voltage transmitter, and bus comprises positive bus-bar and negative busbar;
Described first balance resistance one end is electrically connected with positive bus-bar, other end ground connection, and the two ends of the first balance resistance are also electrically connected with the first voltage transmitter; The first voltage transmitter is also electrically connected with insulating monitoring instrument;
Described second balance resistance one end is electrically connected with negative busbar, other end ground connection, and the two ends of the second balance resistance are also electrically connected with second voltage transmitter, and second voltage transmitter is also electrically connected with insulating monitoring instrument.
3. photovoltaic DC 1000V insulation monitoring and warning device according to claim 1, is characterized in that, described leakage current sensor is non-contact type high voltage DC leakage current sensor, and the measuring accuracy of leakage current sensor is mA level.
4. photovoltaic DC 1000V insulation monitoring and warning device according to claim 1, is characterized in that, described background monitoring system is provided with the Chinese LCDs for showing various monitoring parameters.
CN201420172141.7U 2014-04-11 2014-04-11 Photovoltaic direct current 1000V insulation monitoring device Expired - Fee Related CN203909213U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420172141.7U CN203909213U (en) 2014-04-11 2014-04-11 Photovoltaic direct current 1000V insulation monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420172141.7U CN203909213U (en) 2014-04-11 2014-04-11 Photovoltaic direct current 1000V insulation monitoring device

Publications (1)

Publication Number Publication Date
CN203909213U true CN203909213U (en) 2014-10-29

Family

ID=51783475

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420172141.7U Expired - Fee Related CN203909213U (en) 2014-04-11 2014-04-11 Photovoltaic direct current 1000V insulation monitoring device

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106207999A (en) * 2016-09-14 2016-12-07 海南天能电力有限公司 The guard method of a kind of photovoltaic plant DC side circuit and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106207999A (en) * 2016-09-14 2016-12-07 海南天能电力有限公司 The guard method of a kind of photovoltaic plant DC side circuit and device

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GR01 Patent grant
C14 Grant of patent or utility model
C41 Transfer of patent application or patent right or utility model
ASS Succession or assignment of patent right

Owner name: SHENZHEN JINTING NEW ENERGY TECHNOLOGY CO., LTD.

Free format text: FORMER OWNER: SHENZHEN JINTING TECHNOLOGY CO., LTD.

Effective date: 20150209

TR01 Transfer of patent right

Effective date of registration: 20150209

Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518000 No. 1001 Nanshan Chi Park C1 building 6 floor

Patentee after: Shenzhen Jinting New Energy Technology Co.,Ltd.

Address before: 518000 Guangdong city of Shenzhen province Baoan District Shiyan town Huang Feng Ling Industrial Zone

Patentee before: SHENZHEN JINTING TECHNOLOGY CO., LTD.

Effective date of registration: 20150209

Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518000 No. 1001 Nanshan Chi Park C1 building 6 floor

Patentee after: Shenzhen Jinting New Energy Technology Co.,Ltd.

Address before: 518000 Guangdong city of Shenzhen province Baoan District Shiyan town Huang Feng Ling Industrial Zone

Patentee before: SHENZHEN JINTING TECHNOLOGY CO., LTD.

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141029

Termination date: 20200411

CF01 Termination of patent right due to non-payment of annual fee