CN107202937A - A kind of submarine cable parameter detection method - Google Patents
A kind of submarine cable parameter detection method Download PDFInfo
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- CN107202937A CN107202937A CN201710433839.8A CN201710433839A CN107202937A CN 107202937 A CN107202937 A CN 107202937A CN 201710433839 A CN201710433839 A CN 201710433839A CN 107202937 A CN107202937 A CN 107202937A
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- 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
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
-
- 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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
-
- 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
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
-
- 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
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The invention discloses a kind of submarine cable parameter detection method, methods described comprises the following steps：S1, structure detecting system；S2, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under earth-free stateAnd current valueTo obtain the first impedance z of submarine cables；S3, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under ground stateAnd current valueTo obtain the second impedance z of submarine cableo；S4, the first impedance z obtained according to step S2 and step S3sWith the second impedance zoTo calculate the distribution impedance and distribution susceptance of submarine cable.The distribution impedance and distribution susceptance of submarine cable can be obtained with this detection method, whole detection solution procedure uses analytic formula method, overcome the truncated error problem that traditional detection method is deposited, improve the measuring accuracy of distribution impedance and distribution susceptance, the failure of submarine cable can be excluded in time, improve submarine cable reliability of operation and stability.
Description
Technical field
The present invention relates to detection method, and in particular to a kind of submarine cable parameter detection method.
Background technology
China possesses more than 300 ten thousand square kilometres of marine site and more than 18000 kilometers of long coastline, coastal to be distributed with more than 6000
Island.At present, China increasingly payes attention to the development and utilization of marine resources, national defense construction, Islands Exploitation, marine wind electric field, sea
The exploitation of foreign petroleum resources etc. are required to the support of electric power.Seabed power transmission cable engineering construction is to promote economic integration,
Adapt to national energy strategical planning, optimization energy source configuration, the important component for reducing ambient influnence.
Southern major network is that the first bar 500kV of China is extra large across Qiongzhou Strait 500kV sea electric power cables with Hainan Power Grid networking
Bottom cable.Cable uses self-tolerant oil charging cable, and it is structurally characterized in that and is filled with the insulating oil of low viscosity inside cable insulation, and
Certain pressure is supplied by oil-servicing facilities, to eliminate the possibility that insulating inner produces air gap.500kV submarine cables are exchanged to occur
During failure, rely primarily on the electric parameter of measurement submarine cable and come tracing trouble position to calculate the variable quantity of submarine cable electrical quantity
Put, and the core electric parameter of submarine cable is mainly distribution impedance and distribution susceptance, but it is distributed resistance for submarine cable at present
Anti- and distribution susceptance detection method is all more complicated and there are problems that truncated error, so that seabed can not accurately be diagnosed
The failure of cable, the failure to submarine cable are excluded in time.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art to be used to determine submarine cable distribution resistance there is provided one kind
Anti- and distribution susceptance detection method, accurately to diagnose the failure of submarine cable, be arranged in time the failure of submarine cable
Remove.
To achieve the above object, the technical scheme is that：
A kind of submarine cable parameter detection method, methods described comprises the following steps：
S1, structure detecting system；
S2, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under earth-free state
And current valueTo obtain the first impedance z of submarine cables；
S3, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under ground stateWith
Current valueTo obtain the second impedance z of submarine cableo；
S4, the first impedance z obtained according to step S2 and step S3sWith the second impedance zoTo calculate submarine cable
Distribution impedance and distribution susceptance.
The distribution impedance is calculated by equation below：
The distribution susceptance is calculated by equation below：
In formula：cosh-1For anti-hyperbolic complex function value, D is the length of submarine cable.
The detecting system includes
Experiment power supply, the near-end of itself and submarine cable is electrically connected；
First controlled disconnecting link, it is connected between experiment power supply and the near-end of submarine cable, for changing submarine cable
Off-state；
The distal end of second controlled disconnecting link, its one end connection jaws and submarine cable is electrically connected, other end connection jaws ground connection, uses
In the ground state for changing submarine cable；
Current transformer, it is attempted by submarine cable, the measurement current signal for obtaining submarine cable；
Control module is measured, its summation current transformer is connected, for receiving the submarine cable acquired in current transformer
Measure current signal；
Voltage transformer, one end connection jaws of its primary side are connected with the near-end of submarine cable, and other end connection jaws connect
Ground, one end connection jaws ground connection of secondary side, other end connection jaws are connected with measurement control module；Voltage transformer is used to obtain
The measurement voltage signal of submarine cable, and acquired submarine cable measurement voltage signal is sent in measurement control module；
Measurement electric current and measurement that the measurement control module is transmitted according to current transformer and voltage transformer
Voltage signal come calculate submarine cable distribution impedance and distribution susceptance.
The detecting system also includes the first GPS timing devices and submarine cable distal end phase being connected with experiment power supply
2nd GPS timing devices of connection and the 3rd GPS timing devices being connected with measurement control module.
The measurement control module includes
Binding post, it is used to connect submarine cable, current transformer and and voltage transformer；
Isolated location, it is used to isolate electric current, voltage measurement signal and submarine cable power supply signal that binding post transmission comes
Interference；
Signal condition and collecting unit, it is used to gather voltage, the current measurement signal after isolation；
Digital signal processor, it is used for voltage, the current measurement signal for collecting signal condition and collecting unit
Digital operation is carried out, the corresponding impedance value of voltage, current measurement signal is calculated and submarine cable is calculated according to impedance value
Distribution impedance and distribution susceptance；
Communication control unit, it is used to realize the communication between experiment power supply and the first controlled disconnecting link, the second controlled disconnecting link；
Clock control cell, it passes through the first GPS timing devices, the 2nd GPS timing devices and the 3rd GPS timing devices
Carry out the change of Control experiment power supply, the first controlled disconnecting link and the second controlled disconnecting link state；
Power control unit, it is used for the access and disconnection of Control experiment power supply；
Display end, it is used to show the voltage or current waveform tested；
Mouse end, it is used for the position for controlling the upper mouse of display；
End is printed, it is used to print measurement result；
Interface end, it is used to export to measurement result in USB.
The experiment power supply is alien frequencies signal power source, and working frequency is 40Hz-60Hz, and it includes arranging loop, inversion time
Road and the filter circuit being connected between arrangement loop and inversion circuit；Wherein, loop 100 and three-phase alternating-current supply phase are arranged
The ac voltage rectifier for connecting and being exported three-phase alternating-current supply is into DC voltage, and filter circuit 200, which is used to filter, to be arranged back
The DC voltage that filtered loop 200 is filtered is transformed into by the subsidiary harmonic wave in the DC voltage that road is exported, inversion circuit 300
Alternating voltage is exported.
The filter circuit is formed in parallel by least two filtering submodules, and the filtering submodule is by multiple filtering half sons
Block coupled in series is formed, and half submodule of the filtering is by resistance and is attempted by ohmically electric capacity and is constituted.
The arrangement loop includes transformer and bridge rectifier loop, the first winding access three-phase alternating current of transformer
Source, the secondary winding of transformer is connected with bridge rectifier loop, bridge rectifier loop by ac voltage rectifier into DC voltage,
DC voltage is transformed into alternating voltage by inversion circuit.
The bridge rectifier loop is made up of the first diode, the second diode, the 3rd diode and the 4th diode,
First diode and the 3rd diode are in series, and the second diode and the 4th diode are in series, the negative electrode of the second diode and
The negative electrode of first diode is connected, and the anode of the 4th diode and the anode of the 3rd diode are connected, transformer secondary around
One terminals of group are connected between the first diode and the 3rd diode, and another terminals of transformer secondary winding are connected to
Between second diode and the 4th diode, the negative electrode of the input of filter circuit and the second diode is connected, filter circuit
Output end be connected with the anode of the 4th diode.
The inversion circuit by first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, first reversely simultaneously
Di- pole pipe, the second anti-parallel diodes, the 3rd anti-parallel diodes, the 4th anti-parallel diodes, first resistor,
Two resistance, 3rd resistor, the 4th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, inductance and load capacitance
Constituted；
First switch pipe and second switch pipe are in series, and the 3rd switching tube and the 4th switching tube are in series, the 3rd switching tube
Colelctor electrode be connected with the colelctor electrode of first switch pipe, the emitter stage of the 4th switching tube is connected with the emitter stage of first switch pipe
Connect in succession, the base stage of first switch pipe is connected with the negative electrode of the second diode, the emitter stage of second switch pipe and the four or two pole
The anode of pipe is connected, and the anode and negative electrode of the first anti-parallel diodes distinguish the emitter and collector phase of first switch pipe
The emitter and collector of connection, the anodes of the second anti-parallel diodes and negative electrode second switch pipe respectively is connected, and the 3rd
The emitter and collector of the anode of anti-parallel diodes and negative electrode the 3rd switching tube respectively is connected, the 4th reverse parallel connection two
The emitter and collector of the anode of pole pipe and negative electrode the 4th switching tube respectively is connected；
First resistor and the first electric capacity are in series, the negative electrode of the input of first resistor and the first anti-parallel diodes pipe
It is connected, one end of the first electric capacity is connected with the anode of the first anti-parallel diodes；Second resistance is mutually gone here and there with the second electric capacity
Connection, the negative electrode of the input of second resistance and the second anti-parallel diodes is connected, one end of the second electric capacity and second reverse
The anode of parallel diode is connected；3rd resistor and the 3rd electric capacity are in series, the input of 3rd resistor and the 3rd reversely simultaneously
The negative electrode of di- pole pipe is connected, and one end of the 3rd electric capacity is connected with the anode of the 3rd anti-parallel diodes；4th resistance
It is in series with the 4th electric capacity, the input of the 4th resistance and the negative electrode of the 4th anti-parallel diodes are connected, the 4th electric capacity
One end is connected with the anode of the 4th anti-parallel diodes；
One end of inductance is connected at the node location between first switch pipe and second switch pipe, and the other end is connected to
At node location between three switching tubes and the 4th switching tube；One end of load capacitance is connected to the 3rd switching tube and the 4th switch
At node location between pipe, the colelctor electrode of the other end and the 4th switching tube is connected, and two ends of load capacitance and leading to connect
At line.
Compared with prior art, its advantage is the present invention：
By that can obtain the distribution impedance and distribution susceptance of submarine cable with this detection method, whole detection was solved
Cheng Caiyong analytic formula methods, overcome the truncated error problem that traditional detection method is deposited, and improve distribution impedance and distribution electricity
The measuring accuracy received, so as to exclude the failure of submarine cable in time, improves submarine cable reliability of operation and stably
Property.
Brief description of the drawings
Fig. 1 is the flow chart of submarine cable parameter detection method of the present invention；
The structural representation of Fig. 2 detecting systems；
The schematic diagram of detecting system when Fig. 3 is the first controlled disconnecting link closure；
The schematic diagram of detecting system when Fig. 4 is the first controlled disconnecting link and the second controlled disconnecting link closure；
Fig. 5 is the composition schematic diagram of measurement control module；
Fig. 6 is the built-up circuit figure of experiment power supply；
In figure：1st, experiment power supply；2nd, submarine cable；3rd, the first controlled disconnecting link；4th, the second controlled disconnecting link；5th, Current Mutual Inductance
Device；6th, control module is measured；7th, voltage transformer；8th, the first GPS timing devices；9th, the 2nd GPS timing devices；10th, the 3rd GPS
Timing device；100th, loop is arranged；200th, filter circuit；300th, inversion circuit.
Embodiment
Present disclosure is described in further details with reference to the accompanying drawings and detailed description.
Embodiment：
As shown in fig.1, the submarine cable parameter detection method of the present invention specifically includes following steps：
S1, structure detecting system；
S2, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under earth-free state
And current valueTo obtain the first impedance z of submarine cables；Wherein,
S3, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under ground stateWith
Current valueTo obtain the second impedance z of submarine cableo；Wherein,
S4, the first impedance z obtained according to step S2 and step S3sWith the second impedance zoTo calculate submarine cable
Distribution impedance and distribution susceptance.
Specifically, the distribution impedance is calculated by equation below：
The distribution susceptance is calculated by equation below：
In formula：cosh-1For anti-hyperbolic complex function value, D is the length of submarine cable.
By that can obtain the distribution impedance and distribution susceptance of submarine cable with this detection method, whole detection was solved
Cheng Caiyong analytic formula methods, overcome the truncated error problem that traditional detection method is deposited, and improve distribution impedance and distribution electricity
The measuring accuracy received, so as to exclude the failure of submarine cable in time, improves submarine cable reliability of operation and stably
Property.
Specifically, as shown in Fig. 2 above-mentioned detecting system includes electrical verification source 1, it is mutually electrically connected with the near-end of submarine cable 2
Connect, to provide power supply for whole detecting system, wherein, be connected between the near-end of experiment power supply 1 and submarine cable 2 first by
Control disconnecting link 3, by change the first controlled disconnecting link 3 closure state can change submarine cable 2 energization whether, in submarine cable
2 distal end is connected with the second controlled disconnecting link 4, the other end connection jaws ground connection of the second controlled disconnecting link 4, that is to say, that by changing
The closure state of second controlled disconnecting link 3 can both change the ground state of submarine cable 2.In submarine cable 2 and it is connected to electric current
Transformer 5, the measurement current signal of submarine cable 2 is obtained by current transformer 5, and current transformer 5 is measured
Current signal is sent to measurement control module 6；In addition, the voltage signal in order to obtain submarine cable 2, the one of voltage transformer 7
One end connection jaws of secondary side are connected with the near-end of submarine cable 2, and other end connection jaws ground connection, one end connection jaws of secondary side connect
Ground, other end connection jaws are connected with measurement control module 6, in this way, voltage transformer 7 can obtain the measurement of submarine cable 2
Voltage signal, and acquired submarine cable 2 voltage signals of measurement are sent in measurement control module 6, measure control module 6
The measurement electric current that can be transmitted according to current transformer 5 and voltage transformer 7 and measurement voltage signal are calculated
The impedance value of submarine cable 2, and the impedance value of submarine cable is calculated according to impedance value, calculated finally according to impedance value
Draw the distribution impedance and distribution susceptance of submarine cable.
As shown in figure 3, when the first controlled disconnecting link 3 closes, the second controlled disconnecting link 4 disconnects, voltage transformer 7 and electric current are mutual
Sensor 5 is that can obtain the magnitude of voltage of the submarine cable under earth-free stateAnd current valueAnd be sent to corresponding side value
The first impedance z can be obtained in measurement control module 6s；Similarly, as shown in figure 4, close when the first controlled disconnecting link 3, it is second controlled
When disconnecting link 4 closes, the summation current transformer 5 of voltage transformer 7 is that can obtain the magnitude of voltage of the submarine cable under earth-free stateAnd current valueAnd by corresponding side value be sent to measurement control module 6 in can obtain the second impedance zo, finally measurement control
Molding block 6 can obtain the distribution impedance and distribution susceptance of submarine cable by being distributed distribution impedance and distribution susceptance calculation formula
Value.
Preferably, when above-mentioned submarine cable parameter detecting system also includes the one GPS pairs be connected with experiment power supply 1
The 2nd GPS timing devices 9 that device 8 and submarine cable distal end 2 is connected and and measure the control module 6 is connected the 3rd
GPS timing devices 10, can be right by the first GPS timing devices 8, the 2nd GPS timing devices 9 and the 3rd GPS timing devices 10
When the time pair is played in whole system test, synchronous effect, to be further ensured that the accuracy of testing result.
Specifically, as shown in figure 5, above-mentioned measurement control module 6 includes binding post UA, UN, it is used to connect seabed electricity
Cable 2, current transformer 5 and and voltage transformer 7；Isolated location, it is used to isolate electric current, voltage that binding post transmission comes
The interference of measurement signal and submarine cable power supply signal；Signal condition and collecting unit, it is used to gather voltage, the electricity after isolation
Flow measurement signal；Digital signal processor, it is used for voltage, the current measurement letter for collecting signal condition and collecting unit
Number carry out digital operation, calculate the corresponding impedance value of voltage, current measurement signal and according to impedance value calculate seabed electricity
The distribution impedance and distribution susceptance of cable；Communication control unit, it is used to realizing experiment power supply and the first controlled disconnecting link, second controlled
Communication between disconnecting link；Clock control cell, it controls examination by the first GPS timing devices and the 2nd GPS timing devices
The change in electrical verification source, the first controlled disconnecting link and the second controlled disconnecting link state；Power control unit, it is used for Control experiment power supply
Access and disconnection；Display end, mouse end, printing end and interface end, the display end be used to showing the voltage tested or
Current waveform, mouse end is used for the position for controlling the upper mouse of display, and printing end is used to print measurement result, and interface end is used for will
Measurement result is exported in USB, in this way, this measurement control module can reach following index：
Measurement range：The μ F of electric capacity 0.1~30；The Ω of impedance 0.1~400；Impedance angle：0.1 °~360 °.
Measurement Resolution：The μ F of electric capacity 0.01；The Ω of impedance 0.01；0.01 ° of impedance angle.
Instrument use environment：- 15 DEG C~+40 DEG C of environment temperature；Relative humidity ＜ 90%.
Accuracy of measurement：During measured capacitance amount >=1 μ F, the μ F of ± 1% reading ± 0.01；During measured capacitance amount 1 μ F of ＜, ±
The μ F of 3% reading ± 0.01.During tested impedance >=1 Ω, the Ω of ± 1 reading % ± 0.01；During tested impedance 1 Ω of ＜, ± 3% reading ±
0.01Ω；Impedance angle test condition electric current>0.1A, ± 0.3 ° of (voltage>1.0V), ± 0.5 ° of (voltage：0.2V~1.0V).
Error 72ms at GPS couples.
Wherein, above-mentioned experiment power supply is alien frequencies signal power source, and working frequency is 40Hz-60Hz, to overcome detection to be
The Hz noise problem united in the presence of test process, further to improve the accuracy of testing result, effectively carries out system
Power flow stability is calculated and traveling wave positioning, submarine cable reliability of operation and stability is improved, specifically, as shown in fig. 6, the electricity
Source includes the filter circuit for arranging loop 100, inversion circuit 300 and being connected between arrangement loop 100 and inversion circuit 300
200；Wherein, the ac voltage rectifier that loop 100 is connected with three-phase alternating-current supply and is exported three-phase alternating-current supply is arranged
Into DC voltage, filter circuit 200 is used to filter the subsidiary harmonic wave arranged in the DC voltage that loop is exported, inversion circuit
300 DC voltages for filtering filtered loop 200 are transformed into alternating voltage output.
Specifically, the arrangement loop 100 includes transformer and bridge rectifier loop, the first winding access three of transformer
Cross streams power supply, the secondary winding of transformer is connected with bridge rectifier loop, bridge rectifier loop by ac voltage rectifier into
DC voltage, specifically, the bridge rectifier loop by the first diode VD1, the second diode VD2, the 3rd diode VD3 and
4th diode constitutes VD4, and the first diode VD1 and the 3rd diode VD3 are in series, the second diode VD2 and the four or two pole
Pipe VD4 is in series, and the second diode VD2 negative electrode and the first diode VD2 negative electrode are connected, the 4th diode VD4 sun
Pole is connected with the 3rd diode VD3 anode, and a terminals of transformer secondary winding are connected to the first diode VD1 and
Between three diode VD3, another terminals of transformer secondary winding are connected to the second diode VD2 and the 4th diode VD4
Between, the input of filter circuit and the second diode VD2 negative electrode are connected, the output end of filter circuit and the 4th diode
VD4 anode is connected.And the DC voltage of bridge rectifier loop output then then changes conclusion of the business after inversion circuit 300 from direct current
Flow voltage output.
Wherein, the filter circuit 200 is formed in parallel by two filtering submodules, and filtering submodule is by half submodule of multiple filtering
Block is in series, half submodule of filtering then by 20K/10W resistance and be attempted by ohmically electric capacity and constituted, filtering back
In the presence of road, with filter off arrange loop 100 middle in output DC voltage can subsidiary harmonic wave (filtering out primary and secondary harmonic wave), raising
The smoothness of output voltage waveforms.
And the inversion circuit 300 is then by first switch pipe D1, second switch pipe D2, the 3rd switching tube D3, the 4th switch D4
Pipe, the first anti-parallel diodes Z1, the second anti-parallel diodes Z2, the 3rd anti-parallel diodes Z3, the 4th reversely simultaneously
Di- pole pipe Z4, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the first electric capacity C1, the second electric capacity C2,
3rd electric capacity C3, the 4th electric capacity C4, inductance Lf and load capacitance Cf are constituted；Wherein, first switch pipe Z1 and second switch
Pipe Z2 is in series, and the 3rd switching tube Z3 and the 4th switching tube Z4 are in series, the 3rd switching tube Z3 colelctor electrode and first switch pipe
Z1 colelctor electrode is connected, and the 4th switching tube Z4 emitter stage is connected connection with first switch pipe Z1 emitter stage, and first opens
The base stage for closing pipe Z1 is connected with the second diode VD2 negative electrode, second switch pipe Z2 emitter stage and the 4th diode VD4's
Anode is connected, the first anti-parallel diodes D1 anode and negative electrode difference first switch pipe Z1 emitter and collector phase
Connection, the second anti-parallel diodes D2 anode and negative electrode second switch pipe Z2 respectively emitter and collector are connected,
3rd anti-parallel diodes D3 anode and negative electrode the 3rd switching tube Z3 respectively emitter and collector are connected, and the 4th is anti-
Emitter and collector to parallel diode D4 anode and negative electrode the 4th switching tube Z4 respectively is connected, first switch pipe
Z1, second switch pipe Z2, the 3rd switching tube Z3, the bridge type inverse loop of the 4th switching tube Z4 compositions are realized and become DC voltage
Alternating voltage；
And first resistor R1 and the first electric capacity C1 are in series, first resistor R1 input and the first anti-parallel diodes
D1 negative electrode is connected, and the first electric capacity C1 one end is connected with the first anti-parallel diodes D2 anode；Second resistance R2
It is in series with the second electric capacity C2, second resistance R2 input and the second anti-parallel diodes D2 negative electrode are connected, second
Electric capacity C2 one end is connected with the second anti-parallel diodes D2 anode；3rd resistor R3 and the 3rd electric capacity C3 are in series,
3rd resistor R3 input and the 3rd anti-parallel diodes D3 negative electrode are connected, the 3rd electric capacity C3 one end and the 3rd anti-
Anode to parallel diode D3 is connected；4th resistance R4 and the 4th electric capacity C4 are in series, the 4th resistance R4 input and
4th anti-parallel diodes D4 negative electrode is connected, the 4th electric capacity C4 one end and the 4th anti-parallel diodes D4 anode
It is connected, in this way, under the module that resistance and electric capacity are constituted, the uniform voltage function in bridge type inverse loop can be achieved, makes the bridge-type inverse
Become loop inversion first switch pipe Z1, second switch pipe Z2, the 3rd switching tube Z3,4th under normal work or unusual service condition to open
Pipe Z4 is closed not damage；
And inductance Lf one end is then connected at the node location A between first switch pipe Z1 and second switch pipe Z2, separately
One end is connected at the Node B site between the 3rd switching tube Z3 and the 4th switching tube Z4；Load capacitance Cf one end is connected to
At Node B site between 3rd switching tube Z3 and the 4th switching tube Z4, the other end and the 4th switching tube Z4 colelctor electrode are connected
Connect, load capacitance Cf two ends simultaneously lead to IA, IN at wiring.Cf is the basic load of output loop, ensures output loop not
There is nominal load when connecing load.
In this way, experiment power supply can reach following index：
Power supply：Three-phase, AC 380V ± 10%, 15A, 50Hz (virtual value).
Internal alien frequencies power supply characteristic：AC three-phase maximum output voltage virtual value is 200V；Maximum output current virtual value
For 5A；Output frequency is that 30Hz~2.5kHz is adjustable.
Antijamming capability：The maximum disturbance current that can be born in circuit head and end short circuit grounding is 40A (particular/special requirements
100A can be achieved down).It is 1 in the ratio between output signal and interference signal:It can still stablize under conditions of 10 and accurately complete test.
Above-described embodiment is simply to illustrate that the technical concepts and features of the present invention, the purpose is to be to allow in the art
Those of ordinary skill can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all
It is the equivalent change or modification made according to the essence of present invention, should all covers within the scope of the present invention.
Claims (10)
1. a kind of submarine cable parameter detection method, it is characterised in that methods described comprises the following steps：
S1, structure detecting system；
S2, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under earth-free stateAnd electricity
Flow valuveTo obtain the first impedance z of submarine cables；
S3, detecting system are powered to submarine cable, detect the magnitude of voltage of the submarine cable under ground stateAnd electric current
ValueTo obtain the second impedance z of submarine cableo；
S4, the first impedance z obtained according to step S2 and step S3sWith the second impedance zoTo calculate point of submarine cable
Cloth impedance and distribution susceptance.
2. submarine cable parameter detection method as claimed in claim 1, it is characterised in that the distribution impedance is by equation below
Calculate：
The distribution susceptance is calculated by equation below：
In formula：cosh-1For anti-hyperbolic complex function value, D is the length of submarine cable.
3. submarine cable parameter detection method as claimed in claim 1, it is characterised in that the detecting system includes
Experiment power supply, the near-end of itself and submarine cable is electrically connected；
First controlled disconnecting link, it is connected between experiment power supply and the near-end of submarine cable, the disconnection for changing submarine cable
State；
The distal end of second controlled disconnecting link, its one end connection jaws and submarine cable is electrically connected, other end connection jaws ground connection, for changing
Become the ground state of submarine cable；
Current transformer, it is attempted by submarine cable, the measurement current signal for obtaining submarine cable；
Control module is measured, its summation current transformer is connected, for receiving the submarine cable measurement acquired in current transformer
Current signal；
Voltage transformer, one end connection jaws of its primary side are connected with the near-end of submarine cable, other end connection jaws ground connection, two
One end connection jaws ground connection of secondary side, other end connection jaws are connected with measurement control module；Voltage transformer is used to obtain seabed
The measurement voltage signal of cable, and acquired submarine cable measurement voltage signal is sent in measurement control module；
Measurement electric current and measurement voltage that the measurement control module is transmitted according to current transformer and voltage transformer
Signal come calculate submarine cable distribution impedance and distribution susceptance.
4. submarine cable parameter detection method as claimed in claim 3, it is characterised in that the detecting system also includes and tried
The 2nd GPS timing devices and and measurement that the first GPS timing devices that electrical verification source is connected are connected with submarine cable distal end
The 3rd GPS timing devices that control module is connected.
5. submarine cable parameter detection method as claimed in claim 4, it is characterised in that the measurement control module includes connecing
Terminal, it is used to connect submarine cable, current transformer and and voltage transformer；
Isolated location, it is used to isolate the dry of electric current, voltage measurement signal and submarine cable power supply signal that binding post transmission comes
Disturb；
Signal condition and collecting unit, it is used to gather voltage, the current measurement signal after isolation；
Digital signal processor, its voltage, current measurement signal for being used to collect signal condition and collecting unit are carried out
Digital operation, calculates the corresponding impedance value of voltage, current measurement signal and point of submarine cable is calculated according to impedance value
Cloth impedance and distribution susceptance；
Communication control unit, it is used to realize the communication between experiment power supply and the first controlled disconnecting link, the second controlled disconnecting link；
Clock control cell, it is controlled by the first GPS timing devices, the 2nd GPS timing devices and the 3rd GPS timing devices
The change of experiment power supply processed, the first controlled disconnecting link and the second controlled disconnecting link state；
Power control unit, it is used for the access and disconnection of Control experiment power supply；
Display end, it is used to show the voltage or current waveform tested；
Mouse end, it is used for the position for controlling the upper mouse of display；
End is printed, it is used to print measurement result；
Interface end, it is used to export to measurement result in USB.
6. submarine cable parameter detection method as claimed in claim 3, it is characterised in that the experiment power supply is alien frequencies signal
Power supply, working frequency is 40Hz-60Hz, and it includes arranging loop, inversion circuit and is connected to arrangement loop and inversion circuit
Between filter circuit；Wherein, loop is arranged with three-phase alternating-current supply to be connected and by exchanging that three-phase alternating-current supply is exported
Voltage commutation is into DC voltage, and filter circuit is used to filter the subsidiary harmonic wave arranged in the DC voltage that loop is exported, inversion
The DC voltage of filtered circuit filtration is transformed into alternating voltage output by loop.
7. submarine cable parameter detection method as claimed in claim 6, it is characterised in that the filter circuit is by least two
Filtering submodule is formed in parallel, and the filtering submodule is formed by multiple filtering half son's block coupled in series, half submodule of the filtering
By resistance and it is attempted by ohmically electric capacity and is constituted.
8. submarine cable parameter detection method as claimed in claim 6, it is characterised in that the arrangement loop includes transformer
And bridge rectifier loop, the first winding access three-phase alternating-current supply of transformer, the secondary winding and bridge rectifier of transformer
Loop is connected, and bridge rectifier loop is by ac voltage rectifier into DC voltage.
9. submarine cable parameter detection method as claimed in claim 6, it is characterised in that the bridge rectifier loop is by first
Diode, the second diode, the 3rd diode and the 4th diode composition, the first diode and the 3rd diode are in series,
Second diode and the 4th diode are in series, and the negative electrode of the negative electrode of the second diode and the first diode is connected, and the four or two
The anode of the anode of pole pipe and the 3rd diode is connected, terminals of transformer secondary winding be connected to the first diode and
Between 3rd diode, another terminals of transformer secondary winding are connected between the second diode and the 4th diode, filter
The negative electrode of the input in ripple loop and the second diode is connected, and the output end of filter circuit is connected with the anode of the 4th diode
Connect.
10. submarine cable parameter detection method as claimed in claim 8, it is characterised in that the inversion circuit is opened by first
Guan Guan, second switch pipe, the 3rd switching tube, the 4th switching tube, the first anti-parallel diodes, the second anti-parallel diodes,
3rd anti-parallel diodes, the 4th anti-parallel diodes, first resistor, second resistance, 3rd resistor, the 4th resistance,
One electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, inductance and load capacitance are constituted；
First switch pipe and second switch pipe are in series, and the 3rd switching tube and the 4th switching tube are in series, the collection of the 3rd switching tube
Electrode is connected with the colelctor electrode of first switch pipe, and the emitter stage of the 4th switching tube is connected in succession with the emitter stage of first switch pipe
Connect, the base stage of first switch pipe is connected with the negative electrode of the second diode, the emitter stage of second switch pipe and the 4th diode
Anode is connected, and the anode of the first anti-parallel diodes is connected with the emitter and collector that negative electrode distinguishes first switch pipe
Connect, the emitter and collector of the anodes of the second anti-parallel diodes and negative electrode second switch pipe respectively is connected, and the 3rd is anti-
Emitter and collector to anode and negative electrode the 3rd switching tube respectively of parallel diode is connected, the pole of the 4th reverse parallel connection two
The emitter and collector of the anode of pipe and negative electrode the 4th switching tube respectively is connected；
First resistor and the first electric capacity are in series, and the negative electrode of the input of first resistor and the first anti-parallel diodes pipe is connected
Connect, one end of the first electric capacity is connected with the anode of the first anti-parallel diodes；Second resistance and the second electric capacity are in series, the
The negative electrode of the input of two resistance and the second anti-parallel diodes is connected, one end of the second electric capacity and the second reverse parallel connection two
The anode of pole pipe is connected；3rd resistor and the 3rd electric capacity are in series, the input of 3rd resistor and the pole of the 3rd reverse parallel connection two
The negative electrode of pipe is connected, and one end of the 3rd electric capacity is connected with the anode of the 3rd anti-parallel diodes；4th resistance and the 4th
Electric capacity is in series, and the input of the 4th resistance and the negative electrode of the 4th anti-parallel diodes are connected, one end of the 4th electric capacity and
The anode of 4th anti-parallel diodes is connected；
One end of inductance is connected at the node location between first switch pipe and second switch pipe, and the other end is connected to the 3rd and opened
Close at the node location between pipe and the 4th switching tube；One end of load capacitance be connected to the 3rd switching tube and the 4th switching tube it
Between node location at, the colelctor electrode of the other end and the 4th switching tube is connected, and the two ends of load capacitance are simultaneously led at wiring.
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