CN105938175B - Direct current system instant earthing on-line monitoring method and device manufacturing based on DSP - Google Patents
Direct current system instant earthing on-line monitoring method and device manufacturing based on DSP Download PDFInfo
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- CN105938175B CN105938175B CN201610376016.1A CN201610376016A CN105938175B CN 105938175 B CN105938175 B CN 105938175B CN 201610376016 A CN201610376016 A CN 201610376016A CN 105938175 B CN105938175 B CN 105938175B
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- instant earthing
- ground
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- earthing
- resistance value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The present invention is direct current system instant earthing on-line monitoring method and device manufacturing based on DSP, it is intended to provide a kind of on-Line Monitor Device of instant earthing fault branch in energy quick lock in direct current system generation 3-10 seconds, energy memory storage instant earthing information simultaneously, after even if ground connection disappears, record ground connection information is copied by USB interface, the firsthand data information being grounded in short-term can be retained in time.The present invention is easy to operate understandable using touch screen human-computer interaction interface setting parameter and monitoring display interface.The present invention can monitor direct current system voltage, state of insulation amount in real time, show instant earthing branch number, instant earthing resistance value, instant earthing time.The present invention has RS485 communication interface and wireless communication function, realizes data remote transmission and monitoring.
Description
Technical field
The present invention relates to a kind of direct current system instant earthing on-line monitoring method and device manufacturings, belong to direct current system monitoring
Field.
Background technique
DC system earth fault occurs often, and for permanent earth fault, seal can monitor and inspection, but
It is for intermittent, short-time characteristic ground fault, because duration is short, often there are no inspections to go out for insulation monitoring device
Grounding signal just disappears, at present on-line insulation monitoring device all unable to monitor and inspection direct current systems of country's installation and operation
System instant earthing failure, once moment short-time grounding fault occurs for direct current system, staff is difficult to judge that ground connection occurs at which
One circuit, cannot timely check handling failure, not only increase the work load and psychological pressure of staff, while
Hidden trouble is buried to the safe operation of power grid.
Summary of the invention
The technical problem to be solved in the invention is to overcome the shortcomings of technical background, provides one kind and is quickly handled based on DSP
The on-line monitoring method and device of the direct current system instant earthing failure of system.To solve the moment that direct current system occurs 3-10 seconds
When ground connection, it is able to achieve quick lock in instant earthing branch, memory storage instant earthing information, even if passing through USB after ground connection disappears
Interface copies record ground connection information, can retain the firsthand data information being grounded in short-term in time, convenient for power plant/power station staff analysis
Ground fault is handled with later observation.
A kind of on-line monitoring method and device of the direct current system instant earthing failure based on the quick processing system of DSP,
It is technically characterized in that including the following contents:
(1) bus insulation monitors
As long as measuring busbar voltage U, positive voltage-to-ground U+ and negative voltage-to-ground U-, so that it may calculate face ground resistance value R
+, cathode resistance value R- and bus insulation R over the ground, the acquisition circuit of busbar voltage U, positive voltage-to-ground U+ and negative voltage-to-ground U-:
Decompression processing is carried out to direct current system " busbar voltage " by " potential-divider network ", U+, U- after " sample circuit " acquisition decompression
Voltage value is sent into " A/D conversion " analog quantity and is converted into digital quantity, and digital quantity feeding " dsp controller ", which is computed processing, to be surveyed
Busbar voltage U, positive voltage-to-ground U+ and negative voltage-to-ground U- out can calculate face ground resistance value R+, cathode to ground resistance
Value R- and bus insulation R shows busbar voltage U, positive voltage-to-ground U+, negative voltage-to-ground at " touch screen human-computer interaction interface "
The value of U-, face ground resistance value R+, cathode resistance value R- and bus insulation R over the ground, realize real time monitoring direct current system voltage and
State of insulation amount；
(2) ground signalling is injected
" dsp controller " is if the resistance value for calculating intelligent decision bus insulation R after bus insulation R is lower than through " touch screen
When the warning value of human-computer interaction interface " setting, control instruction starting " isolated drive circuit 1 " is issued, " moment is driven after being isolated
Earth current I d generation circuit " exports instant earthing electric current I d, injects earth bus and the earth by " current-limiting protection circuit "
Between；
(3) instant earthing Branch-circuit check
" dsp controller " is if the resistance value for calculating intelligent decision bus insulation R after bus insulation R is lower than through " touch screen
When the warning value of human-computer interaction interface " setting, automatic detecting acquires grounding electric current, aobvious at " touch screen human-computer interaction interface "
Voltage status amount when showing instant earthing branch number, instant earthing resistance value, instant earthing time and instant earthing, grounding electricity
Stream acquisition circuit: the size by being mounted on " branch detects mutual inductor CT " the induction instant earthing electric current I d of feeder line branch road,
It is sent into " high-speed a/d conversion " after " signal amplification circuit " enhanced processing and is converted into digital quantity, digital quantity is sent into " dsp controller "
It is computed processing, calculates the resistance value of instant earthing, is quoted instant earthing branch number and instant earthing time, instant earthing is issued
Alarm signal is simultaneously emitted by control instruction starting " isolated drive circuit 2 " driving " instant earthing alarm indicator " and lights, " wink
Alarming node indirectly " is outputed；
(4) ground connection information is downloaded
" dsp controller " calculates the resistance value of instant earthing, after quoting instant earthing branch number, automatically by ground connection information,
It is stored in " instant earthing memory ", record ground connection information is copied by the downloading of " USB downloading " interface, even if passing through after ground connection disappears
USB interface copies record ground connection information, can retain the firsthand data information of instant earthing in time, convenient for operation maintenance personnel subsequent analysis and
Observation processing；
(5) data are transmitted
The resistance value that " dsp controller " calculates instant earthing automatically leads to ground connection information after quoting instant earthing branch number
It crosses " RS485 " communication and is transmitted to centralized control apparatus, instant earthing information can also be sent to " user by " wireless telecommunications "
Terminal " realizes remote data intelligent transportation and monitoring.
The present invention has the characteristics that safe, practical, has good promotion and practical value, popularization and application will generate good
Economic benefit and social benefit.
Detailed description of the invention
Fig. 1 is the principle frame of the present invention based on DSP direct current system instant earthing on-line monitoring method and device manufacturing
Figure.
Fig. 2 is that the implementation of the present invention based on DSP direct current system instant earthing on-line monitoring method and device manufacturing is former
Manage block diagram.
Specific embodiment
The present invention relates to a kind of direct current system instant earthing on-line monitoring method and device based on the quick processing system of DSP
Manufacture.
Fig. 2 is that the implementation of the present invention based on DSP direct current system instant earthing on-line monitoring method and device manufacturing is former
Manage block diagram.In figure, 3-10 seconds instant earthings occur in the cathode of " busbar voltage " for " load ", and ground resistance is Rd.
The input quantity of apparatus of the present invention: positive voltage-to-ground U+, the negative voltage-to-ground U-, the earth of busbar voltage, branch detection
Mutual inductor CT.
Combination principle figure and implementation principle block diagram are illustrated the technology of the present invention implementation:
(1) bus insulation monitors
As long as instant earthing occurs for direct current system, positive voltage-to-ground U+, negative voltage-to-ground U- necessarily change, device
By the value for measuring busbar voltage U, positive voltage-to-ground U+, negative voltage-to-ground U-, so that it may calculate face ground resistance value R+, cathode
Resistance value R- (size of R- i.e. Rd resistance value) over the ground, bus insulation R, and shown by " touch screen human-computer interaction interface "
The value of busbar voltage U, positive voltage-to-ground U+, negative voltage-to-ground U-, face ground resistance value R+, cathode resistance value R- (R-=over the ground
Rd), the value (R=R-=Rd) of bus insulation R realizes real time monitoring direct current system voltage, state of insulation amount.
The acquisition circuit of busbar voltage U, positive voltage-to-ground U+, negative voltage-to-ground U-: by the positive voltage-to-ground U of busbar voltage
+, negative voltage-to-ground U-, the earth access device.Device carries out at decompression direct current system " busbar voltage " by " potential-divider network "
Reason, U+, U- voltage value after " sample circuit " acquisition decompression, is sent into " A/D conversion " analog quantity and is converted into digital quantity, number
Amount feeding " dsp controller ", which is computed processing, can measure busbar voltage U, positive voltage-to-ground U+, negative voltage-to-ground U-, further count
Calculate face ground resistance value R+, cathode resistance value R-, bus insulation R over the ground.
(2) ground signalling is injected
" dsp controller " is if the resistance value for calculating intelligent decision bus insulation Rd after bus insulation R=Rd is lower than through " touching
Touch screen human-computer interaction interface " setting warning value when, issue control instruction starting " isolated drive circuit 1 ", drive " instant earthing
Electric current I d generation circuit " exports instant earthing electric current I d, is injected between cathode and the earth by " current-limiting protection circuit ".
(3) instant earthing Branch-circuit check
" dsp controller " is if the resistance value for calculating intelligent decision bus insulation Rd after bus insulation R=Rd is lower than through " touching
Touch screen human-computer interaction interface " setting warning value when, device automatic detecting acquire grounding electric current, by after calculation process
" touch screen human-computer interaction interface " shows instant earthing branch number, instant earthing resistance value Rd, instant earthing time, instant earthing
When voltage status amount.
Grounding current acquisition circuit: " branch detects mutual inductor CT " the induction moment by being mounted on feeder line branch road
The size of earth current I d is sent into " high-speed a/d conversion " after " signal amplification circuit " enhanced processing and is converted into digital quantity, number
Word amount is sent into " dsp controller " and is computed processing, and the resistance value for calculating instant earthing is Rd, quotes instant earthing branch number, wink
Time indirectly issues instant earthing alarm signal, is simultaneously emitted by control instruction starting " isolated drive circuit 2 " driving " moment
Ground connection alarm indicator " is lighted, and " instant earthing alarming node " is outputed.
(4) ground connection information is downloaded
The resistance value that " dsp controller " calculates instant earthing is Rd, and hair is grounded alarm signal, while automatically believing ground connection
Breath, such as grounding resistance Rd, ground branch number, ground connection time, deposit " instant earthing memory " is interior, passes through " USB downloading " interface
Record ground connection information is copied in downloading.
(5) data are transmitted
" dsp controller " calculates the resistance value Rd of instant earthing, hair ground connection alarm signal, while automatically leading to ground connection information
It crosses " RS485 " communication and is transmitted to centralized control apparatus.Instant earthing information is sent to " user terminal " by " wireless telecommunications "
Realize remote data intelligent transportation and monitoring.
Claims (1)
1. a kind of direct current system instant earthing on-line monitoring method based on DSP, it is characterised in that:
(1) bus insulation monitors
As long as measuring busbar voltage U, positive voltage-to-ground U+ and negative voltage-to-ground U-, so that it may calculate face ground resistance value R+, bear
Pole resistance value R- and bus insulation R over the ground, the acquisition circuit of busbar voltage U, positive voltage-to-ground U+ and negative voltage-to-ground U-: passes through
" potential-divider network " carries out decompression processing to direct current system " busbar voltage ", U+, U- voltage after " sample circuit " acquisition decompression
Value is sent into " A/D conversion " analog quantity and is converted into digital quantity, and digital quantity feeding " dsp controller ", which is computed processing, can measure mother
Line voltage U, positive voltage-to-ground U+ and negative voltage-to-ground U- can calculate face ground resistance value R+, cathode resistance value R- over the ground
And bus insulation R, " touch screen human-computer interaction interface " show busbar voltage U, positive voltage-to-ground U+, negative voltage-to-ground U-,
The value of face ground resistance value R+, cathode resistance value R- and bus insulation R over the ground realize real time monitoring direct current system voltage and insulation
Quantity of state；
(2) ground signalling is injected
" dsp controller " is if the resistance value for calculating intelligent decision bus insulation R after bus insulation R is lower than by the way that " touch screen is man-machine
When the warning value of interactive interface " setting, control instruction starting " isolated drive circuit 1 " is issued, " instant earthing is driven after being isolated
Electric current I d generation circuit " exports instant earthing electric current I d, is injected between earth bus and the earth by " current-limiting protection circuit "；
(3) instant earthing Branch-circuit check
" dsp controller " is if the resistance value for calculating intelligent decision bus insulation R after bus insulation R is lower than by the way that " touch screen is man-machine
When the warning value of interactive interface " setting, automatic detecting acquires grounding electric current, shows at " touch screen human-computer interaction interface "
Voltage status amount when instant earthing branch number, instant earthing resistance value, instant earthing time and instant earthing, grounding electric current are adopted
Collection circuit: the size by being mounted on " branch detects mutual inductor CT " the induction instant earthing electric current I d of feeder line branch road, warp
It is sent into " high-speed a/d conversion " after " signal amplification circuit " enhanced processing and is converted into digital quantity, digital quantity is sent into " dsp controller " warp
Calculation processing calculates instant earthing resistance value, quotes instant earthing branch number and instant earthing time, issues instant earthing alarm letter
Number, it is simultaneously emitted by control instruction starting " isolated drive circuit 2 " driving " instant earthing alarm indicator " and lights, " instant earthing
Alarming node " is outputed；
(4) instant earthing information is downloaded
" dsp controller " calculates instant earthing resistance value, after quoting instant earthing branch number, is automatically stored in instant earthing information
In " instant earthing memory ", record instant earthing information is copied by the downloading of " USB downloading " interface, even if passing through after ground connection disappears
USB interface copies record instant earthing information, can retain the firsthand data information of instant earthing in time, is convenient for subsequent point of operation maintenance personnel
Analysis and observation processing；
(5) data are transmitted
" dsp controller " calculates instant earthing resistance value, after quoting instant earthing branch number, automatically passes through instant earthing information
" RS485 " communication is transmitted to centralized control apparatus, and instant earthing information is sent to " user terminal " in fact by " wireless telecommunications "
Existing remote data intelligent transportation；
The instant earthing information includes: instant earthing resistance value, instant earthing branch number and instant earthing time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610376016.1A CN105938175B (en) | 2016-05-31 | 2016-05-31 | Direct current system instant earthing on-line monitoring method and device manufacturing based on DSP |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201610376016.1A CN105938175B (en) | 2016-05-31 | 2016-05-31 | Direct current system instant earthing on-line monitoring method and device manufacturing based on DSP |
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| Publication Number | Publication Date |
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| CN105938175A CN105938175A (en) | 2016-09-14 |
| CN105938175B true CN105938175B (en) | 2019-03-12 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109725229B (en) * | 2019-01-04 | 2023-09-29 | 中国南方电网有限责任公司超高压输电公司梧州局 | Detection device and method for distinguishing capacitive transient ground fault branch from resistive transient ground fault branch |
| CN110470963A (en) * | 2019-09-24 | 2019-11-19 | 云南电网有限责任公司红河供电局 | A kind of high voltage capacitive apparatus insulated performance on-line monitoring device based on DSP |
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| CN202975169U (en) * | 2012-11-13 | 2013-06-05 | 哈尔滨九洲电气股份有限公司 | DC system ground insulation detection circuit based on DSP |
| CN203365603U (en) * | 2013-07-17 | 2013-12-25 | 国家电网公司 | Portable direct-current system ground fault locating device |
| CN104237645A (en) * | 2014-09-04 | 2014-12-24 | 上海慕安电气有限公司 | Online monitoring system and method for insulation state of substation DC system |
| CN204595150U (en) * | 2015-04-08 | 2015-08-26 | 大唐淮南洛河发电厂 | A kind of direct-current insulation monitoring device |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1306682A2 (en) * | 2001-10-02 | 2003-05-02 | Robin Electronics Limited | Circuit tester |
| EP2450715A1 (en) * | 2010-11-08 | 2012-05-09 | ABB Technology AG | Device and method for determining the earth resistance of a direct current system |
| CN102830283A (en) * | 2011-06-13 | 2012-12-19 | 中兴通讯股份有限公司 | Insulating detection device and detection method for direct-current power supply |
| CN202975169U (en) * | 2012-11-13 | 2013-06-05 | 哈尔滨九洲电气股份有限公司 | DC system ground insulation detection circuit based on DSP |
| CN203365603U (en) * | 2013-07-17 | 2013-12-25 | 国家电网公司 | Portable direct-current system ground fault locating device |
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| CN105938175A (en) | 2016-09-14 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zeng Guang Inventor before: Shi Jianhui Inventor before: Mao Ju Inventor before: Lu Bo |
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| CB03 | Change of inventor or designer information | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191217 Address after: 550002 NO.67, magic Road, Nanming District, Guiyang City, Guizhou Province Patentee after: Guiyang Xinguang Electric Co., Ltd. Address before: 550002 Guizhou Province, Guiyang city Nanming District Jade Factory Road Tongxin yuan A Building 2 unit 602 room Patentee before: Guiyang Yingnarui Electric Co. Ltd. |
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| TR01 | Transfer of patent right |