CN203589693U - Power DC system ground fault detecting system - Google Patents
Power DC system ground fault detecting system Download PDFInfo
- Publication number
- CN203589693U CN203589693U CN201320637169.9U CN201320637169U CN203589693U CN 203589693 U CN203589693 U CN 203589693U CN 201320637169 U CN201320637169 U CN 201320637169U CN 203589693 U CN203589693 U CN 203589693U
- Authority
- CN
- China
- Prior art keywords
- differential current
- leakage current
- control device
- power
- fault
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 abstract description 4
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a power DC system ground fault detecting system comprising a differential current detecting device, an AC leakage current filtering device, a microprocessor device, a fault clearing control device, and an alarm display device. The differential current detecting device and the fault clearing control device are connected with outgoing loopd of an output bus of the power DC system. The AC leakage current filtering device is connected with the differential current detecting device. The microprocessor device is connected with the AC leakage current filtering device, the fault clearing control device, and the alarm display device. Compared with a product in the prior art, the power DC system ground fault detecting system acquires differential current among various outgoing loops of the output bus and filters the differential current in order to eliminate influence of AC leakage current. Therefore, high detection precision is achieved; accuracy of determining ground faults is guaranteed; and false alarm rate is decreased.
Description
Technical field
The utility model relates to power failure detection field, especially relates to a kind of electric power DC system ground-fault detection system.
Background technology
The earth fault of direct current power system is the problem can not be ignored in electric power system always, and earth fault refers to that conductor is connected with the unexpected of the earth.Little to can ignore time when the impedance connecting, this connection is called " dead ground ".The protection of earth fault is divided into three kinds of situations: utilize the set overcurrent protection of distribution line to double as earth fault protection; Utilize zero-sequence current to be grounded error protection; Utilize residual current to be grounded error protection.Therefore need to when earth fault occurs, be, it is detected accurately, realize the quick protection of fault, sensitive not but the ground fault detection device of most detects, disturbed by other factors, accuracy is limited.
Utility model content
The purpose of this utility model is exactly to provide in order to overcome the defect that above-mentioned prior art exists the electric power DC system ground-fault detection system that a kind of accuracy of detection is high.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of electric power DC system ground-fault detection system, comprise differential current detection, AC leakage current filter, micro processor, apparatus, failure removal control device and alarm display apparatus, described differential current detection and failure removal control device are connected on the transmission line circuit of electric power DC system output bus, described AC leakage current filter connects differential current detection, and described micro processor, apparatus is connected with AC leakage current filter, failure removal control device and alarm display apparatus respectively.
This detection system also comprises fuse, and this fuse is arranged on each transmission line circuit of electric power DC system output bus.
Compared with prior art, the utility model, by output bus is respectively occurred to the differential current between loop gathers, is eliminated the impact of AC leakage current, thereby is reached higher accuracy of detection after filtering, guarantees the accuracy of earth fault judgement, reduces rate of false alarm.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model system;
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of electric power DC system ground-fault detection system, comprising: differential current detection 1, for detection of the differential current of the differential current between the each transmission line circuit of direct current system output bus; AC leakage current filter 2, for eliminating the AC leakage current component because electrostatic capacitance causes over the ground from differential current; Micro processor, apparatus 3, by comparing to determine whether to have occurred ground-fault condition by current value and a predetermined threshold of above-mentioned AC leakage current cancellation element output; Failure removal control device 4, for disengagement failure loop, realizes protection; With alarm display apparatus 5, for fault is carried out to display alarm; Fuse 6, for the protection of the each transmission line circuit of electric power DC system output bus.
Its annexation is: differential current detection 1 and failure removal control device 4 are connected on the transmission line circuit of electric power DC system output bus, AC leakage current filter 2 connects differential current detection 1, micro processor, apparatus 3 is connected with AC leakage current filter 2, failure removal control device 4 and alarm display apparatus 5 respectively, and fuse 6 is arranged on each transmission line circuit of electric power DC system output bus.
Claims (2)
1. an electric power DC system ground-fault detection system, it is characterized in that, comprise differential current detection, AC leakage current filter, micro processor, apparatus, failure removal control device and alarm display apparatus, described differential current detection and failure removal control device are connected on the transmission line circuit of electric power DC system output bus, described AC leakage current filter connects differential current detection, and described micro processor, apparatus is connected with AC leakage current filter, failure removal control device and alarm display apparatus respectively.
2. a kind of electric power DC system ground-fault detection system according to claim 1, is characterized in that, this detection system also comprises fuse, and this fuse is arranged on each transmission line circuit of electric power DC system output bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320637169.9U CN203589693U (en) | 2013-10-15 | 2013-10-15 | Power DC system ground fault detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320637169.9U CN203589693U (en) | 2013-10-15 | 2013-10-15 | Power DC system ground fault detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203589693U true CN203589693U (en) | 2014-05-07 |
Family
ID=50587545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320637169.9U Expired - Lifetime CN203589693U (en) | 2013-10-15 | 2013-10-15 | Power DC system ground fault detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203589693U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577974A (en) * | 2013-10-15 | 2015-04-29 | 上海中铁通信信号国际工程有限公司 | Ground fault detection system and method for direct current power system |
-
2013
- 2013-10-15 CN CN201320637169.9U patent/CN203589693U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577974A (en) * | 2013-10-15 | 2015-04-29 | 上海中铁通信信号国际工程有限公司 | Ground fault detection system and method for direct current power system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2541715B1 (en) | Dc power supply insulation fault detection circuit | |
| CN103454535A (en) | Comprehensive load series connection arc fault identification method | |
| CN203415061U (en) | Intelligent electrical fire hazard monitoring device | |
| CN105334425A (en) | Arc fault detection apparatus | |
| CN106786417B (en) | A kind of transmission line of electricity broken string method of discrimination based on electrical quantity transmitting | |
| CN103308755B (en) | The insulation detection device of high voltage direct current remote electric power system and method | |
| US20180069391A1 (en) | Travelling Wave Protection Of A Transmission Line | |
| CN203838236U (en) | Device for detecting electric crossing of direct-current system | |
| CN203589693U (en) | Power DC system ground fault detecting system | |
| CN103683231B (en) | A kind of power distribution network switchyard with intelligent switchboard | |
| CN103381757A (en) | Fault latch circuit of electric vehicle controller | |
| WO2019075673A1 (en) | Single-phase-to-ground fault detection method and device based on electric field induction, and storage medium | |
| CN103063978A (en) | Detection method and device for short circuit | |
| CN206057425U (en) | The adjustable DC voltage detecting system of marginal range | |
| CN104280189A (en) | Pressure sensor fault hardware detection method and device | |
| CN202837385U (en) | Zero-cross detection circuit | |
| CN104577974A (en) | Ground fault detection system and method for direct current power system | |
| CN102938556B (en) | With the capacitor protection measurement and control integration device of unbalanced current protection function | |
| CN206235664U (en) | Three-phase and four-line intelligent electric meter and its fall zero line detection circuit | |
| CN104196087A (en) | Water supply device with fault detection function | |
| CN105281292A (en) | AC/DC filter capacitor internal grounding fault protection method | |
| CN103245836A (en) | Novel intelligent tramegger with self-discharge function | |
| CN105891691A (en) | Distributed local discharge detection and early warning system for high-voltage switch cabinet | |
| CN203312784U (en) | 10kV voltage transformer resonance eliminating device | |
| CN203350333U (en) | DC (direct current) system alternating current fault detection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161021 Address after: 200436 No. 248 West Road, Shanghai Patentee after: CHINA RAILWAY SIGNAL & COMMUNICATION SHANGHAI ENGINEERING BUREAU GROUP Co.,Ltd. Address before: 200436 room 86, 88 and three, 501 Road, Zhabei District, Shanghai Patentee before: CHINA RAILWAY SIGNAL & COMMUNICATION SHANGHAI ENGINEERING INTERNATIONAL Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20140507 |
|
| CX01 | Expiry of patent term |