CN109142947A - DC suppling network remote station ground state detection method based on impedance variations - Google Patents
DC suppling network remote station ground state detection method based on impedance variations Download PDFInfo
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- CN109142947A CN109142947A CN201810799180.2A CN201810799180A CN109142947A CN 109142947 A CN109142947 A CN 109142947A CN 201810799180 A CN201810799180 A CN 201810799180A CN 109142947 A CN109142947 A CN 109142947A
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- remote station
- frequency
- ground state
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- direct current
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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 invention discloses the DC suppling network remote station ground state detection methods based on impedance variations, the following steps are included: in direct current medium-pressure electricity supply network central site DC output side parallel connection high-frequency ac source branch, under the premise of guaranteeing a direct current medium-pressure electricity supply network remote station normal ground state, high-frequency ac source outlet side earth impedance when survey calculation remote station normal ground stateReal-time measurement direct current medium-pressure electricity supply network medium-high frequency alternating current source outlet side earth impedance to be detectedCompareWithBetween difference and preset threshold value m, the remote station ground state in detection direct current medium-pressure electricity supply network to be detected using the variation of earth impedance value as criterion.The present invention can effectively detect remote station ground state in direct current medium-pressure electricity supply network.
Description
Technical field
The invention belongs to the technical field of Fault Diagnosis Simulation, in particular to presses and supply in a kind of direct current based on impedance variations
The detection method of electric network remote station ground state.
Background technique
In direct current medium-pressure electricity supply network, many equipment are installed on remote station, and are supplied from central site to remote station
Electricity.The distance between central site and remote station can achieve thousands of rice, and voltage value may be up to hundreds of volts in transmission line.
Large number of equipment is installed in remote station, device housings are connect via cable with the earth, to guarantee device housings
It is not charged.And carelessness when installation or because it is disconnected to will lead to good connection between device housings and the earth due to stealing etc.
It opens, and then caused direct result is exactly to have high potential on device housings, ground state is changed by original good earth
Ground connection disconnects.On the one hand, due in remote station circuit topological structure it is sufficiently complex, in remote station install ground state inspection
It is larger to survey device difficulty；On the other hand, installation detecting device can change original circuit topological structure in remote station, can shadow
Ring the normal work of equipment.By the method higher cost and workload manually detected to the ground state of remote station
It is larger.Thus, it is detected to realize lower cost to the ground state of equipment in remote station, it is necessary in central site
Remote station is remotely detected using suitable detection method.
Summary of the invention
It is an object of the invention to for be difficult in existing direct current medium-pressure electricity supply network to remote station ground state into
The problem of row detection, proposes a kind of solution, remotely detects remote station ground state in central site installation detecting device,
Impedance detection installation cost is lower, will not influence the normal work of equipment in remote station.
The present invention is realized by following technical proposals.
The present invention is based on the DC suppling network remote station ground state detection methods of impedance variations, including following step
It is rapid:
1) in direct current medium-pressure electricity supply network central site B DC output side parallel connection high-frequency ac source branch A；
2) under the premise of guaranteeing direct current medium-pressure electricity supply network remote station normal ground state, survey calculation remote station
The electric current of high-frequency ac source outlet side when C normal ground stateWith the voltage at high-frequency ac source both endsAccording to the electric current of measurementAnd voltageEarth impedance is calculated
3) electric current of direct current medium-pressure electricity supply network medium-high frequency alternating current source outlet side when measuring remote station C real-time statusWith
The voltage at high-frequency ac source both endsAccording to the electric current of measurementAnd voltageEarth impedance is calculated
4) earth impedance when by normal ground stateWith earth impedance when real-time statusBetween difference and in advance
The threshold value m of setting compares:
WhenThen think to survey moment remote station ground connection normally；
WhenThen think that surveying moment remote station ground connection disconnects.
For above-mentioned technical proposal, there are also further preferred schemes by the present invention:
Preferably, the high-frequency ac source branch A is included in direct current medium-pressure electricity supply network central site B DC output side string
Connection every alternating current sense, with every hand over inductance in parallel capacitance and high-frequency ac source, capacitance connect every friendship inductance output end
And with high-frequency ac it is source-series after ground connection；The output cable D of remote station C is met in succession every the outlet side of alternating current sense.
Preferably, it is described every alternating current sense be series at the three-plase half wave rectifier circuit of central site B output cathode direct current with
Direct current source filter capacitor and electrode line are over the ground on resistance nodes.
Preferably, the output electricity for connecting remote station C is parallel to after the capacitance and the source-series connection of high-frequency ac
Between cable D head end and the earth.
Preferably, resonance when the high-frequency ac source frequency is direct current medium-pressure electricity supply network remote station normal ground state
Frequency.
Preferably, with real-time high-frequency ac source outlet side to ground resistance when direct current medium-pressure electricity supply network remote station ground connection is normal
It is anti-WithFor earth impedance value at alternating current source frequency values.
The present invention has the advantages that due to taking above technical scheme
Direct current medium-pressure electricity supply network remote station ground state detection method of the present invention based on impedance variations exists
When specific operation, by central site measure high-frequency ac source outlet side earth impedance, using the variation of earth impedance value as
Judgment basis detects the remote station ground state of direct current medium-pressure electricity supply network to be detected, and user can be according to the distal end detected
Website ground connection disconnects failure in time for remote station equipment ground, improves the safe and reliable of direct current medium-pressure electricity supply network work
Property, it is easy to operate, it is safe and efficient.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing does simple introduction.It should be evident that drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is remote station ground state detection circuit；
Wherein, A is high-frequency ac source branch；B is center website；C is remote station；D is output cable；1 hands over for high frequency
Stream source；2 be capacitance；3 is every alternating current senses.
Specific embodiment
In order to which the technical problems, technical solutions and beneficial effects solved by the present invention is more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
As shown in Figure 1, the DC suppling network remote station ground state detection method of the invention based on impedance variations,
The following steps are included:
1) be arranged in parallel high-frequency ac source branch A in direct current medium-pressure electricity supply network DC output side, including every alternating current sense 3,
Capacitance 2 and high-frequency ac source 1, measurement obtain alternating current source output voltage
It is concatenated every alternating current that high-frequency ac source branch A is included in direct current medium-pressure electricity supply network central site B DC output side
Feel and every the capacitance and high-frequency ac source for handing over inductance in parallel, capacitance connects to be handed over every friendship inductance output end and with high frequency
Flow source-series rear ground connection；The output cable D of remote station C is met in succession every the outlet side of alternating current sense.Center is series at every alternating current sense
The three-plase half wave rectifier circuit of website B output cathode direct current and direct current source filter capacitor and electrode line resistance nodes over the ground
On.The output cable D head end and the earth for connecting remote station C are parallel to after capacitance and the source-series connection of high-frequency ac
Between.
Wherein, resonance frequency when high-frequency ac source frequency is direct current medium-pressure electricity supply network remote station normal ground state.
Direct current medium-pressure electricity supply network remote station ground connection it is normal when with real-time high-frequency ac source outlet side earth impedanceWithFor alternating current source
Earth impedance value at frequency values.
2) under the premise of guaranteeing direct current medium-pressure electricity supply network remote station normal ground state, survey calculation remote station
The electric current of high-frequency ac source outlet side when C normal ground stateWith the voltage at high-frequency ac source both endsAccording to the electric current of measurementAnd voltageEarth impedance is calculated
3) electric current of direct current medium-pressure electricity supply network medium-high frequency alternating current source outlet side when measuring remote station C real-time statusWith
The voltage at high-frequency ac source both endsAccording to the electric current of measurementAnd voltageEarth impedance is calculated
4) earth impedance when by normal ground stateWith earth impedance when real-time statusBetween difference and pre-
The threshold value m first set compares:
WhenThen think to survey moment remote station ground connection normally；
WhenThen think that surveying moment remote station ground connection disconnects.
The present invention can be used in direct current medium-pressure electricity supply network, since human factor leads in remote station that there are ground connection
Disconnect failure.By measuring high-frequency ac source outlet side earth impedance in central site, the variation of earth impedance value can be made
For detect direct current medium-pressure electricity supply network to be detected remote station ground state judgment basis, on this basis, according to detection
The remote station ground connection haveing disconnects failure in time by remote station equipment ground.
Claims (6)
1. the DC suppling network remote station ground state detection method based on impedance variations, which is characterized in that including following
Step:
1) in direct current medium-pressure electricity supply network central site B DC output side parallel connection high-frequency ac source branch A；
2) under the premise of guaranteeing direct current medium-pressure electricity supply network remote station normal ground state, survey calculation remote station C is just
The electric current of high-frequency ac source outlet side when normal ground stateWith the voltage at high-frequency ac source both endsAccording to the electric current of measurementWith
VoltageEarth impedance is calculated
3) electric current of direct current medium-pressure electricity supply network medium-high frequency alternating current source outlet side when measuring remote station C real-time statusAnd high frequency
The voltage at alternating current source both endsAccording to the electric current of measurementAnd voltageEarth impedance is calculated
4) earth impedance when by normal ground stateWith earth impedance when real-time statusBetween difference with preset
Threshold value m compare:
WhenThen think to survey moment remote station ground connection normally；
WhenThen think that surveying moment remote station ground connection disconnects.
2. the DC suppling network remote station ground state detection method according to claim 1 based on impedance variations,
It is characterized in that, to be included in direct current medium-pressure electricity supply network central site B DC output side concatenated by the high-frequency ac source branch A
Every alternating current sense, with every hand over inductance in parallel capacitance and high-frequency ac source, capacitance connect every friendship inductance output end and with
Ground connection after high-frequency ac is source-series；The output cable D of remote station C is met in succession every the outlet side of alternating current sense.
3. the DC suppling network remote station ground state detection method according to claim 2 based on impedance variations,
It is characterized in that, the three-plase half wave rectifier circuit and direct current for being series at central site B output cathode direct current every alternating current sense
Source filter capacitor and electrode line are over the ground on resistance nodes.
4. the DC suppling network remote station ground state detection method according to claim 2 based on impedance variations,
It is characterized in that, being parallel to the output cable D head for connecting remote station C after the capacitance and the source-series connection of high-frequency ac
Between end and the earth.
5. the DC suppling network remote station ground state detection method according to claim 1 based on impedance variations,
It is characterized in that, resonance frequency when the frequency in the high-frequency ac source is direct current medium-pressure electricity supply network remote station normal ground state
Rate.
6. the DC suppling network remote station ground state detection method according to claim 1 based on impedance variations,
It is characterized in that, with real-time high-frequency ac source outlet side to ground resistance when the direct current medium-pressure electricity supply network remote station is grounded normal
It is anti-WithFor earth impedance value at alternating current source frequency values.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810799180.2A CN109142947A (en) | 2018-07-19 | 2018-07-19 | DC suppling network remote station ground state detection method based on impedance variations |
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|---|---|---|---|
| CN201810799180.2A CN109142947A (en) | 2018-07-19 | 2018-07-19 | DC suppling network remote station ground state detection method based on impedance variations |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102292921A (en) * | 2009-01-22 | 2011-12-21 | 高通股份有限公司 | impedance change detection in wireless power transmission |
| CN202494775U (en) * | 2012-03-28 | 2012-10-17 | 广州优维电子科技有限公司 | Calibrator for DC system insulation device |
| CN203688720U (en) * | 2013-06-19 | 2014-07-02 | 国家电网公司 | Fault detection system for DC transmission grounding electrode circuits |
| CN104914313A (en) * | 2015-06-10 | 2015-09-16 | 国网上海市电力公司 | Grounding grid fault diagnosis method based on sweep frequency impedance measurement |
| CN105137192A (en) * | 2015-09-10 | 2015-12-09 | 山东康威通信技术股份有限公司 | Cable shielding layer grounding performance monitoring device and method based on complex impedance measurement |
-
2018
- 2018-07-19 CN CN201810799180.2A patent/CN109142947A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102292921A (en) * | 2009-01-22 | 2011-12-21 | 高通股份有限公司 | impedance change detection in wireless power transmission |
| CN202494775U (en) * | 2012-03-28 | 2012-10-17 | 广州优维电子科技有限公司 | Calibrator for DC system insulation device |
| CN203688720U (en) * | 2013-06-19 | 2014-07-02 | 国家电网公司 | Fault detection system for DC transmission grounding electrode circuits |
| CN104914313A (en) * | 2015-06-10 | 2015-09-16 | 国网上海市电力公司 | Grounding grid fault diagnosis method based on sweep frequency impedance measurement |
| CN105137192A (en) * | 2015-09-10 | 2015-12-09 | 山东康威通信技术股份有限公司 | Cable shielding layer grounding performance monitoring device and method based on complex impedance measurement |
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Application publication date: 20190104 |
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