CN104374990B - A kind of system and method for carrying out ground potential difference monitoring - Google Patents
A kind of system and method for carrying out ground potential difference monitoring Download PDFInfo
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- CN104374990B CN104374990B CN201410721170.9A CN201410721170A CN104374990B CN 104374990 B CN104374990 B CN 104374990B CN 201410721170 A CN201410721170 A CN 201410721170A CN 104374990 B CN104374990 B CN 104374990B
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Abstract
The present invention provides a kind of system and method for carrying out ground potential difference monitoring,Including transformer station and transmission line of alternation current,Substation grounding band steel is connected with main transformer of transformer substation neutral point,The main transformer of two transformer stations is connected by transmission line of alternation current,Ground potential difference produces the electric current for flowing through transmission line of alternation current,Wave recording device is connected between substation grounding band steel and main transformer of transformer substation neutral point,Wave recording device is connected with GSM/GPRS network services,GSM/GPRS networks are connected with monitoring master station's server communication,GPS sychronisations are also connected with wave recording device,The present invention forms potential difference test loop between monitoring substation,Realize and cover regional ground potential difference monitoring net,Strong foundation is provided for earth current activity and the Logic relationship analysis of power system operating mode,Help to improve regional earthquake disaster monitoring and early warning platform construction,For electric power,The abnormal operating condition of the systems such as communication provides criterion.
Description
Technical field
The present invention relates to a kind of transmission line of alternation current and transformer station using 110kV and the above, and electric power is flowed through by monitoring
The DC current of transformer neutral point, realize and recording and the system monitored in real time and side are carried out to the ground potential difference at circuit both ends
Method.
Background technology
Earthquake is one of Major Natural Disasters on the earth, and in recent years, earthquake disaster is frequent, and seismic wave caused by earthquake can be straight
Connect the destruction for causing building or even collapse, occur to be also possible to cause the disasters such as landslide, personnel caused by earthquake in mountain area
Injures and deaths and property loss can not be estimated.Earthquake can cause the earth local potential to change, by analyzing ground potential difference mechanics,
Help to improve regional earthquake disaster monitoring and early warning means.
Magnetic storm, DC transmission system monopolar operation can cause ground potential difference to change, and carry out ground potential difference and become
The monitoring of change helps to judge the abnormality of the systems such as electric power, the communication of related region, formulates corresponding measure in time.
At present in terms of ground potential difference observation, it is required to lay special measurement loop, it is general to be no more than 10 kilometers,
Invest huge, it is impossible to build the wide observational network of area coverage.China's electric system AC electricity transmission network is flourishing, distance, covering
It is wide, provide inborn measuring loop to carry out ground potential difference study on monitoring.
The content of the invention
The present invention provides a kind of system and method for carrying out ground potential difference monitoring according to the deficiencies in the prior art, to region
Magnetic storm activity, earthquake electrical activity, DC transmission system monopole the earth phenomena such as running caused ground potential difference live
Dynamic rule, is monitored in real time.
Technical scheme：A kind of system for carrying out ground potential difference monitoring, including transformer station and AC power line
Road, it is characterised in that：The substation grounding band steel is connected on main transformer of transformer substation neutral point, the main transformer pressure of two transformer stations
Device is connected by transmission line of alternation current, and ground potential difference produces the electric current for flowing through transmission line of alternation current, the grounding flat steel of transformer station
Wave recording device is connected with the neutral point being connected with the main transformer of transformer station, wave recording device connects with GSM/GPRS network services
Connect, GSM/GPRS networks are connected with monitoring master station's server communication, wave recording device, GSM/GPRS networks and the service of monitoring master station
Device forms data transmission network, and GPS sychronisations are also connected with wave recording device.
A kind of method that ground potential difference monitoring is carried out using said system, it is characterised in that：Comprise the following steps,
S1, each substation grounding band steel connects its main transformer of transformer substation respectively, and is connected by transmission line of alternation current
The main transformer of transformer substation of two adjacent substations forms loop, and ground potential difference produces the transmission loop by transmission line of alternation current
Electric current；
S2, wave recording device are arranged on main transformer of transformer substation (2) neutral point, and measurement in real time passes through transmission line of alternation current
Transmit loop current；
S3, GPS sychronisation receive satellite-signal, and carry out time complexity curve to wave recording device in station, fill all recordings
The time is put to act in agreement；
The transmission loop current data of each measurement is sent to GSM/GPRS nets by S4, all wave recording devices to act in agreement
On network；
All transmission loop current datas received are sent on the total site server of monitoring by S5, GSM/GPRS network
The Simultaneous Monitoring of synchronization the whole network earth current distribution is realized, reaches the effect for carrying out ground potential monitoring.
The transmission voltage of the transmission line of alternation current is more than or equal to 110kV.
Ground potential difference U=I between Liang Ge transformer stations0*(RB+RL), wherein I0Pass through for what wave recording device (4) measured
The transmission loop current of transmission line of alternation current, main transformer D.C. resistance RBWith transmission line of alternation current D.C. resistance RLFor power train
System periodical power failure test data.
The technique effect of the present invention：
1. form monitoring substation apart from the characteristics of remote, DC impedance is small using transmission line of alternation current broad covered area, circuit
Between potential difference test loop；
2. after device installation, energy fast speed access systems network, realize and cover regional ground potential difference monitoring net；
It is earth current activity and the logic of power system operating mode 3. each distributed wave recording devices are synchronous using gps satellite
Relationship analysis provides strong foundation；
4. by monitoring a regional ground potential difference mechanics, help to improve regional earthquake disaster monitoring and pre-
Alert platform construction, the abnormal operating condition for systems such as electric power, communications provide criterion.
Brief description of the drawings
Fig. 1 is ground potential difference Fundamentals of Supervisory Systems figure of the present invention；
Fig. 2 is earth current transmission circuit diagram of the present invention；
Fig. 3 is layout drawing of the wave recording device of the present invention in AC network；
Fig. 4 is data transmission network schematic diagram of the present invention.
Label represents respectively in figure, 1-substation grounding band steel；2-main transformer of transformer substation；
3-transmission line of alternation current；4-wave recording device；5-GSM/GPRS networks；The total site server of 6-monitoring；7—GPS
Sychronisation.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of system for carrying out ground potential difference monitoring, including transformer station and transmission line of alternation current 3, it is special
Sign is：The substation grounding band steel 1 of the transformer station is connected on main transformer of transformer substation 2, the power transformation station owner of two transformer stations
Transformer 2 is connected by transmission line of alternation current 3, and ground potential difference produces the electric current for flowing through transmission line of alternation current 3, and transformer station connects
Wave recording device 4, wave recording device 4 and GSM/GPRS nets are connected with the neutral point that ground band steel 1 is connected with the main transformer 2 of transformer station
Network 5 communicates to connect, and GSM/GPRS networks 5 communicate to connect with monitoring total site server 6, wave recording device 4, GSM/GPRS networks 5 with
And the total site server 6 of monitoring forms data transmission network, and GPS sychronisations 7 are also connected with wave recording device 4.
As shown in Fig. 2 the potential difference occurred between Liang Ge transformer stations is equivalent with constant pressure source U, pass through main transformer direct current
Hinder RB, transmission line of alternation current D.C. resistance RLProduce the transmission loop current I by transmission line of alternation current0, pass through grounded screen electric resistance
The transmission loop current I by the earth is produced with the earth equivalent resistance1。
Specifically, 110kV and above transmission line of alternation current D.C. resistance are usually no more than 50m Ω/kilometer, power transformer
D.C. resistance is no more than 1 Ω, and exemplified by a distance of 200 kilometers of transformer stations, its transmission line of electricity impedance is no more than 10 Ω, and whole impedance is not
More than 12 Ω, it may thus be appreciated that when producing 12mV ground potential differences, that is, there are 1mA electric currents, the measurement demand of the current value is with existing
E measurement technology can meet.
As shown in figure 3, the characteristics of system utilizes transmission line of alternation current broad covered area, circuit distance is remote, DC impedance is small, is
Carry out ground potential difference study on monitoring and provide easily electric current transmission loop.In figure, wave recording device #1 monitoring 500kV transformer stations
The DC current being linked into 220kV transmission line of alternation currents；Wave recording device #2 monitoring 220kV transformer stations are linked into 220kV exchanges
DC current in transmission line of electricity；Wave recording device #3 monitoring 220kV transformer stations are linked into the electric current of 110kV transformer stations；Recording fills
Put the electric current that #4 monitoring 110kV transformer stations are linked into 110kV transmission line of alternation currents.By that analogy, using transmission line of alternation current,
Ground potential difference current monitoring loop between N number of 110kV and ratings above transformer station can be formed.
Each transformer station wave recording device is arranged on main transformer of transformer substation neutral ground band steel, measurable electric current I0,
The potential difference U=I between Liang Ge transformer stations can then be obtained0*(RB+RL), wherein main transformer D.C. resistance RBAnd AC power line
Road D.C. resistance RLPeriodically have a power failure test data for power system, the data are basically unchanged in operation.
As shown in figure 4, the wave recording device of each transformer station continuously samples to the current value of each monitoring point at different moments, you can
Realize the long-term follow to ground potential difference changing rule.Utilize the local GSM/GPRS wireless networks of covering and monitoring master station clothes
Business device carries out two-way data communication, realizes the deployment of wave recording device remote access network.Select multiple transformer station's installation recording dresses
Put, realize and cover regional ground potential difference monitoring net.
GPS sychronisations receive satellite-signal, produce accurate pulse per second (PPS) and moment value, complete to repair the wave recording device time
Just.Wave recording device makes all wave recording device acquisition time steps one according to setting identical to gather moment and acquisition time interval
Cause, realize the Simultaneous Monitoring of synchronization the whole network earth current distribution.
The technique effect of the present invention, utilize transmission line of alternation current broad covered area, the spy that circuit distance is remote, DC impedance is small
Point, form potential difference test loop between monitoring substation；After device installation, energy fast speed access systems network, realize that covering is whole
Individual regional ground potential difference monitoring net；Each distributed wave recording devices are synchronous using gps satellite, are earth current activity and power network
The Logic relationship analysis of the method for operation provides strong foundation；By monitoring a regional ground potential difference mechanics, help
In improving regional earthquake disaster monitoring and early warning platform construction, the abnormal operating condition for systems such as electric power, communications provides criterion.
Claims (2)
1. a kind of system for carrying out ground potential difference monitoring, including transformer station and transmission line of alternation current (3), it is characterised in that：Institute
State substation grounding band steel (1) to be connected on main transformer of transformer substation (2) neutral point, the main transformer (2) of two transformer stations passes through
Transmission line of alternation current (3) is connected, and ground potential difference produces the electric current for flowing through transmission line of alternation current (3), the grounding flat steel of transformer station
(1) wave recording device (4), wave recording device (4) and GSM/GPRS are connected with the neutral point being connected with the main transformer (2) of transformer station
Network (5) communicates to connect, and GSM/GPRS networks (5) communicate to connect with monitoring total site server (6), wave recording device (4), GSM/
GPRS network (5) and the total site server (6) of monitoring form data transmission network, and GPS synchronizations are also associated with wave recording device (4)
Device (7), the transmission voltage of the transmission line of alternation current (3) are more than or equal to 110kV；The wave recording device (4) includes：Recording
Device #1 monitoring 500kV transformer stations are linked into the DC current in 220kV transmission line of alternation currents；Wave recording device #2 monitors 220kV
Transformer station is linked into the DC current in 220kV transmission line of alternation currents；Wave recording device #3 monitoring 220kV transformer stations are linked into
The electric current of 110kV transformer stations；Wave recording device #4 monitoring 110kV transformer stations are linked into the electric current in 110kV transmission line of alternation currents；With
This analogizes, and using transmission line of alternation current, can form ground potential difference current monitoring between N number of 110kV and ratings above transformer station
Loop.
2. a kind of method that system using described in claim 1 carries out ground potential difference monitoring, it is characterised in that：Including following
Step,
S1, each substation grounding band steel (1) connects its main transformer of transformer substation (2) respectively, and passes through transmission line of alternation current (3)
The main transformer of transformer substation (2) for connecting two adjacent substations forms loop, and ground potential difference, which produces, passes through transmission line of alternation current (3)
Transmission loop current；
S2, wave recording device (4) are arranged on main transformer of transformer substation (2) neutral point, and measurement in real time passes through transmission line of alternation current (3)
Transmission loop current, the wave recording device (4) of each transformer station continuously samples to the current value of each monitoring point at different moments；
S3, GPS sychronisation (7) receive satellite-signal, produce accurate pulse per second (PPS) and moment value, complete to wave recording device (4)
Time complexity curve, wave recording device (4) gathers moment and acquisition time interval according to setting identical, when making all wave recording devices (4)
Between act in agreement；
The transmission loop current data of each measurement is sent to GSM/GPRS nets by S4, all wave recording devices (4) to act in agreement
On network (5)；
All transmission loop current datas received are sent to the total site server (6) of monitoring by S5, GSM/GPRS network (5)
On realize synchronization the whole network earth current distribution Simultaneous Monitoring, reach carry out ground potential monitoring effect；
Ground potential difference U=I0* (RB+RL) between Liang Ge transformer stations, wherein I0 pass through exchange for what wave recording device (4) measured
The transmission loop current of transmission line of electricity (3), main transformer D.C. resistance RB and transmission line of alternation current D.C. resistance RL are power train
System periodical power failure test data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410721170.9A CN104374990B (en) | 2014-12-02 | 2014-12-02 | A kind of system and method for carrying out ground potential difference monitoring |
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| CN201410721170.9A CN104374990B (en) | 2014-12-02 | 2014-12-02 | A kind of system and method for carrying out ground potential difference monitoring |
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| CN107942394A (en) * | 2017-11-16 | 2018-04-20 | 广东电网有限责任公司佛山供电局 | A kind of system and its monitoring method for carrying out ground potential difference monitoring |
| CN114624492B (en) * | 2022-04-22 | 2023-04-07 | 西南交通大学 | Method for measuring potential difference of two remote transformer substation ground grids caused by direct current |
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2014
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|---|---|---|---|---|
| CN1885658A (en) * | 2006-05-19 | 2006-12-27 | 南方电网技术研究中心 | Device for restraining AC transformer DC magnetic bias current |
| CN101039028A (en) * | 2007-03-30 | 2007-09-19 | 马志强 | Electric potential compensation process for reducing neutral point direct current of high-voltage grid transformer |
| CN101207273A (en) * | 2007-11-15 | 2008-06-25 | 上海市电力公司超高压输变电公司 | Method for inhibiting voltage transformer noise caused by DC magnetic biasing |
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