CN206583977U - Device for the function monitoring of the grounding connection of electric power system - Google Patents
Device for the function monitoring of the grounding connection of electric power system Download PDFInfo
- Publication number
- CN206583977U CN206583977U CN201621453876.2U CN201621453876U CN206583977U CN 206583977 U CN206583977 U CN 206583977U CN 201621453876 U CN201621453876 U CN 201621453876U CN 206583977 U CN206583977 U CN 206583977U
- Authority
- CN
- China
- Prior art keywords
- measurement
- time domain
- pulse
- grounding
- reflection
- 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
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
-
- 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
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
-
- 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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model is related to the device of the function monitoring of the grounding connection for electric power system, described device be used for be directly grounded or resistance eutral grounding electric power system, the device has the time domain reflection technology method that performs, and is configurable for developing by the time for assessing reflected measurement signal the time domain reflection technology measurement apparatus of the resistance value connected come monitoring grounding.Main thought of the present utility model is based upon change of the measurement signal of time domain reflection technology method monitoring reflection at grounding connection on amplitude.
Description
Technical field
The utility model be related to for be directly grounded or resistance eutral grounding electric power system grounding connection function monitoring
Device.
Background technology
To meet electric power system on operation, fire prevention and the requirement of safety standard, in direct (non-resistance) ground connection power supply system
Electric protective device such as residual current device (RCD) is used in system, and is filled in ungrounded electric power system using insulating monitoring
Put, or the monitored ground connection of use in resistance grounded system (high resistance grounding --- HRG, low resistance earthing --- LRG)
Resistance (neutral point grounding resistor --- NGR).Most protection devices only offer electric power system all ground connection
The working condition of connection also with the network configuration of the electric power system of installation to it is corresponding when could realize that its protects work(to greatest extent
Energy.
Especially for resistance eutral grounding electric power system, wherein, fault current will be by (neutral if occurring earth fault
Point) grounding resistance limitation, when being related to electrical safety, reliably follow the resistance value specified extremely important；Needed for not following
Resistance value can cause the risk on the great person and material.
(here, ignore the partial ohmic of grounding electrode, hereafter also same) in the electric power system that non-resistance is grounded, it then follows zero
The resistance value of ohm is also no less important.The defect of non-resistance grounding connection, such as by open circuit or the increase of contact resistance
Caused defect, equally also results in the system environments of danger.
Therefore, only it just can guarantee that the electrical safety of electric power system when also ensureing the quality of grounding connection.Therefore, it is right
The monitoring of grounding connection becomes particularly important, and has become the prerequisite of some application-specifics.
Periodic detection is carried out to electric utility according to relevant accident prevention regulations, still, according to prior art, due to inspection
Technical work amount needed for surveying all grounding connections is sizable, therefore does not monitor the contact over the ground of electric power system generally.
Furthermore, long assay intervals can also produce monitoring breach.
In addition, the position in order to recognize connection of being out of order when detecting grounding connection, is tested according to the type of application
The fact that electric current can reach 25A is also proved to be destructive to the network operation.
However, in the individual facility with particular requirement, can use special monitoring device, it is measured to earth-current
And it is derived there resistance to earth.Due to the general very little of the electric current of permission, in this case, only relative high resistance failure ability
It is identified.
Such detection shows, when being related to electrical safety, and the continuing to monitor for grounding connection of electric power system is seemed
Through extremely necessary.
Utility model content
Therefore, current purpose of the present utility model is to provide a kind of can realize in an economical manner and electric power system is connect
The device of the function monitoring of ground connection.
The purpose by it is a kind of be used for be directly grounded or resistance eutral grounding electric power system grounding connection function monitoring
Device realizes that the device includes performing the time domain reflection technology measurement apparatus of time domain reflection technology method, the Time Domain Reflectometry skill
Art measurement apparatus is configurable for developing and the resistance value of monitoring grounding connection by the time for assessing reflected measurement signal.
Main thought of the present utility model advantageously is based in time domain reflection technology measurement apparatus by Time Domain Reflectometry skill
Change of the measurement signal that the monitoring of art method is reflected at grounding connection on amplitude.Each link position of resistance --- assuming that
Grounding connection is terminated with the all-in resistance of the characteristic impedance corresponding to this position --- and often place's defect on grounding connection
The discontinuity of representing characteristic impedance, referred to as impedance mismatching, therefore, can be anti-in the position of connection or the position of impedance mismatching
The measurement pulse of offer is provided.Judgement on impedance mismatching degree can be drawn according to the reflected measurement signal received, so that
Draw the judgement of the electric state on the resistance of (ground connection) resistance and on grounding connection.
If the resistance of the grounding resistance of grounding connection is deteriorated due to such as aging sign, or if grounding connection is sent out
Raw defect, then can be in the development of the reflected measurement signal of reception and the change of reflection profile (reflection profile)
It was observed that.Can these changes developing to amplitude be estimated, for be directly grounded or resistance eutral grounding electric power system
In grounding connection function monitoring.
Allow to monitor the multiple grounding connections interconnected according to device of the present utility model simultaneously, the reflection received is cutd open
Face represents the image occurred in all impedance mismatchings of link position and the possible breakdown position of grounding connection.
Therefore, install and one kind is represented with extraordinary cost efficiency, low energy consumption and essence according to device of the present utility model
The means of the true electrical security for strengthening electric power system.
In a preferred embodiment, the time domain reflection technology measuring unit of the resistance value connected for monitoring grounding includes as follows
Part：For generating time domain reflection technology measurement pulse and being supplied to ground connection to be monitored to connect time domain reflection technology measurement pulse
The device connect；Device for receiving the reflected measurement signal being made up of reflection measurement pulse train；For believing in reflection measurement
Number the assessment result of time development show that new reflection measurement pulse is added into, and/or the width at known reflection position
When value is changed relative to the sequence of the reflected measurement signal of previous receipt, represent what the resistance value being grounded changed with signal
Device.
During starting, the measurement signal generated according to time domain reflection technology method is supplied to connecing for electric power system to be monitored
Ground is connected, if necessary, it is contemplated that the interference signal of potential generation, it is determined that appropriate offer position.Due on grounding connection
The impedance mismatching of generation, receives and represents that all on grounding connection to be monitored known (reflection is cutd open with unknown reflection position
Face) timing diagram picture reflected signal sequence.
Due to the systematic parameter of known electric power system --- the physical characteristic on description cable properties and cable length
Data are known --- the run time of measurement signal is known, therefore can be realized the reflection measurement pulse of reception point
Reflection position known to dispensing.The distribution of these measurement pulses can manually be carried out by display device (display), Huo Zhetong
Cross trigger event (for example exceeding predetermined amplitude threshold value in some run time time frames (time frame)) automatic progress.Together
What sample can also not found during failure based on calibration process and electric utility predetermined allows amplitude and run time time frame
Automatically to distribute measurement pulse.
If drawing the sequence of the reflection measurement pulse compared to previous receipt to the assessment that the time develops, there is new reflection
Measurement pulse be added into conclusion when, then this correspond to grounding connection on characteristic impedance (further) discontinuity, straight
Connect in (non-resistance) ground connection electric power system, the discontinuity represents the defect relevant with the cable bad of grounding connection.
If comparative assessment draws the conclusion for having amplitude to change at known reflection position, it can be assumed that reason is to set
Grounding resistance at the position changes.
According to further embodiment, generation and offer measurement signal and processing reflected measurement signal can pass through time domain
Reflection technology measurement apparatus realizes that each device performs different time domain reflection technology principles.
In the simplest situations, time domain reflection technology measurement apparatus is configurable for generating and provides individual pulse work
For measurement pulse.The individual pulse is preferably the square edge-impulse of rectangular pulse shape, reflection measurement pulse by directly or
Further processing is indirectly used for using correlation calculations.Locating interferers by way of on being measured run time,
The deformation of this time domain reflection technology is referred to as TDR methods (time-domain reflectometry, time domain reflectometry).
Have confirmed, if time domain reflection technology measurement apparatus be configurable for generating and provide spreading code as with
The measurement signal of extension is composed, and including for by known spreading code and the correlation of the reflection measurement pulse progress received
Calculate to handle the correlation calculations unit (STDR-sequence time domain reflectometry) of reflected measurement signal, or if Time Domain Reflectometry
Technology measurement apparatus is configurable for generating, provide and handling the spreading code as the measurement signal with spectrum extension, institute
State the carrier signal that spreading code modulates sinusoidal shape, and in correlation calculations unit by the reflection measurement pulse that receives and
Know that the correlation calculations of spreading code realize processing reflected measurement signal (SSTDR- spread-spectrums time domain reflectometry), be not easily susceptible to do
The influence disturbed.
Last-mentioned two kinds of embodiments are used as measurement using the signal with frequency expansion for being referred to as spreading code
Pulse, and be combined with correlation calculations, so as to the interference effect preferably on confrontation grounding connection.In addition, with TDR side
Method is compared, and the energy requirement of these methods is less.
In SSTDR methods, by the multiplication (modulation of carrier signal) of the carrier signal of sinusoidal shape, additionally occurs court
To the frequency shift (FS) of the spread-spectrum of the frequency range suitable for transmission measurement signal.
In a further embodiment, time domain reflection technology measuring unit is configurable for generating what sequential was alternately sent
Two sequences of complement code are used as spreading code.
It is therefore preferred that two sequences of the complement code alternately sent using pseudo-random sequence or sequential are used as spreading code.
These sequences are notable due to its good correlation properties, and the sequence of complement code especially has auto-correlation function, its
Value outside central value (zero shift) is just zero.
Brief description of the drawings
Further preferred embodiment can be obtained from following description and drawings, and wherein accompanying drawing is in an illustrative manner
Show preferred embodiment of the present utility model.
Fig. 1 is the schematic diagram of the embodiment according to device of the present utility model.
Embodiment
In the diagram, Fig. 1 uses the example to the function monitor of the grounding connection 4 in resistance eutral grounding electric power system 6, shows
Go out the use according to device 2 of the present utility model.Electric power system 6 is connected to its active conductor 8, the sheet of user 10 including user
Body is grounded respectively.Resistance eutral grounding electric power system 6 is grounded to individually ground connection by grounding resistance 14 at its supply position 12 and connected
Connect 4.
For carrying out the device 2 of function monitoring to grounding connection 4 to the offer measurement pulse of grounding connection 4 of electric power system 6.
Due to impedance mismatching of the grounding connection 4 by grounding resistance 14, the reflection of measurement pulse is produced at the position of grounding connection 14.
Therefore, the reflection position is known, and this causes reflection measurement pulse is detected and distributed in reflection profile as can
Energy.
If the assessment to the time development of reflected measurement signal show that the amplitude of the reflection measurement pulse of correlation is changed,
Can using it is therefore assumed that its reason as grounding resistance 14 change.
If the change of the amplitude has exceeded predetermined threshold value, send alert notification and/or close the phase of electric power system
Gateway subsystem.So as to, by sending alert notification or by closing system, the letter that will can be received from the change of detected amplitude
Breath is integrated into the electrical safety concept of electric utility.
In addition, based on the reflection newly increased, also representing the interference source of the discontinuity of the characteristic impedance of grounding resistance, such as
Cable breakage, can be positioned in the unknown position on the grounding connection in direct (non-resistance) ground connection electric power system.
Claims (7)
1. a kind of device of the function monitoring of grounding connection for electric power system, described device is used to be directly grounded or resistance connects
The electric power system on ground, it is characterised in that including：
Perform time domain reflection technology method and be configured to develop by the time for assessing reflected measurement signal and connected come monitoring grounding
Resistance value time domain reflection technology measurement apparatus.
2. device according to claim 1, it is characterised in that
The time domain reflection technology measurement apparatus of the resistance value connected for monitoring grounding includes：For generating time domain measurement pulse simultaneously
Time domain measurement pulse is supplied to the device of grounding connection to be monitored；For receive by reflection measurement pulse train constitute it is anti-
Penetrate the device of measurement signal；Assessment result for the time development in reflected measurement signal shows new reflection measurement arteries and veins
Punching is added into, and/or the amplitude at known reflection position is changed relative to the sequence of the reflected measurement signal of previous receipt
When, the device that the resistance value of grounding connection is changed is represented with signal.
3. device according to claim 2, it is characterised in that
The time domain reflection technology measurement apparatus is configurable for generating and provides individual pulse as measurement pulse.
4. device according to claim 2, it is characterised in that
The time domain reflection technology measurement apparatus is configurable for generating and provides spreading code as the measurement with spectrum extension
Pulse, and including anti-for being handled by the correlation calculations carried out to known spreading code and the reflection measurement pulse received
Penetrate the correlation calculations unit of measurement signal.
5. device according to claim 2, it is characterised in that
The time domain reflection technology measurement apparatus is configurable for generating, provide and handling as the measurement with spectrum extension
The spreading code of pulse, the spreading code modulated sinusoidal carrier, and the reflection in correlation calculations unit by receiving
The correlation calculations for measuring pulse and known spreading code realize processing reflected measurement signal.
6. the device according to claim 4 or 5, it is characterised in that the time domain reflection technology measurement apparatus is configured as
For generating pseudo-random sequence as spreading code.
7. the device according to claim 4 or 5, it is characterised in that
The time domain reflection technology measurement apparatus is configurable for generating two sequence conducts of the complement code that sequential is alternately sent
Spreading code.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015226783.0A DE102015226783A1 (en) | 2015-12-29 | 2015-12-29 | Method and device for monitoring the function of a ground connection in a power supply system |
| DE102015226783.0 | 2015-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206583977U true CN206583977U (en) | 2017-10-24 |
Family
ID=59010539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621453876.2U Expired - Fee Related CN206583977U (en) | 2015-12-29 | 2016-12-28 | Device for the function monitoring of the grounding connection of electric power system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206583977U (en) |
| DE (1) | DE102015226783A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT402770B (en) * | 1995-04-25 | 1997-08-25 | Haefely Trench Austria Gmbh | METHOD FOR MONITORING A THREE-PHASE NETWORK FOR A CHANGE IN THE TUNING COOLER |
| DE19852591A1 (en) * | 1998-11-14 | 2000-05-25 | Daimler Chrysler Ag | Procedure for testing an earth connection |
| US7282922B2 (en) * | 2005-01-31 | 2007-10-16 | University Of Utah Research Foundation | Wire network mapping method and apparatus using impulse responses |
| AT503929B1 (en) * | 2007-02-01 | 2008-02-15 | Adaptive Regelsysteme Ges M B | Auxiliary signal injecting device for electric distribution network, has electrical terminals connected to phase conductor and ground, respectively, where impedance and/or admittance of switching network is modified relative to terminals |
| ATE517353T1 (en) * | 2009-02-19 | 2011-08-15 | Abb Research Ltd | METHOD FOR TESTING A POWER DISTRIBUTION SYSTEM AND POWER DISTRIBUTION SYSTEM ANALYZER |
| US8324906B2 (en) * | 2010-03-19 | 2012-12-04 | Honeywell International Inc. | Methods for detecting a hidden peak in wire fault location applications—improving the distance range resolution |
| DE102011079455B4 (en) * | 2011-07-20 | 2013-10-31 | Bender Gmbh & Co. Kg | Method and device for inductive impression of a measuring signal voltage in a power supply network |
| DE102013225946B4 (en) * | 2013-12-13 | 2024-01-25 | Bender Gmbh & Co. Kg | Device and method for insulation monitoring in a power supply system with a high-resistance grounded star point |
-
2015
- 2015-12-29 DE DE102015226783.0A patent/DE102015226783A1/en not_active Withdrawn
-
2016
- 2016-12-28 CN CN201621453876.2U patent/CN206583977U/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE102015226783A1 (en) | 2017-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171024 Termination date: 20201228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |