CN107271871A - Submarine cable DC break down voltage test charge accumulation dissipation system and method for testing - Google Patents
Submarine cable DC break down voltage test charge accumulation dissipation system and method for testing Download PDFInfo
- Publication number
- CN107271871A CN107271871A CN201710601572.9A CN201710601572A CN107271871A CN 107271871 A CN107271871 A CN 107271871A CN 201710601572 A CN201710601572 A CN 201710601572A CN 107271871 A CN107271871 A CN 107271871A
- Authority
- CN
- China
- Prior art keywords
- submarine cable
- voltage
- mrow
- electrode
- gamma
- 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.)
- Granted
Links
Classifications
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses submarine cable DC break down voltage test charge accumulation dissipation system and method for testing, the system includes voltage and produced and dissipation device, and it exports the voltage of the positive or negative polarity of Pass Test requirement to submarine cable；Voltage measuring apparatus, itself and submarine cable are electrically connected, the voltage value changes for measuring submarine cable；Submarine cable insulating paper conductivity measuring apparatus, it is connected with the insulating paper sample of submarine cable, the electrical conductivity for measuring submarine cable insulating paper；Submarine cable insulating oil conductivity measuring apparatus, it is used for the electrical conductivity for measuring submarine cable insulating oil；Arithmetic processing apparatus, it draws the stored charge of submarine cable according to the electrical conductivity of submarine cable insulating paper and the electrical conductivity of submarine cable insulating oil come calculation process.The system can overcome traditional insulaion resistance effectively to examine the problem of insulating properties of submarine cable are not enough because test voltage is low, also can solve the problem that the calculation process problem of charge accumulation after the experiment of long range 500kV submarine cables.
Description
Technical field
The present invention relates to submarine cable technical field of measurement and test, and in particular to the accumulation of submarine cable DC break down voltage test charge disappears
The system of dissipating and method of testing.
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, is additionally provided with eliminating inside the possibility that insulating inner produces air gap, cable insulation
Insulating paper., it is necessary to carry out insulating properties test, traditional insulaion resistance is due to examination before exchange 500kV submarine cables put into operation
Electrical verification, which is forced down, can not effectively examine the insulating properties of submarine cable, when carrying out commissioning test using ac voltage withstanding mode, due to
The electric capacity of long range 500kV submarine cables is big, needs the reactor compensated many when carrying out ac voltage withstanding, causes live ac voltage withstanding
Experiment is carried out difficult.At present temporarily without effective method to charge accumulation caused by process of the test after the pressure test of scene insulation at present
Calculation process is carried out, causes there is blindness to the electric discharge work after the completion of submarine cable pressure test at present, may be to experiment
Personnel injure and equipment causes to damage.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art can be to submarine cable progress insulating properties there is provided one kind
The submarine cable DC break down voltage test charge accumulation dissipation system and method for testing of test.
To achieve the above object, the technical scheme is that：
A kind of submarine cable DC break down voltage test charge accumulation dissipation system, including
Voltage is produced and dissipation device, and it includes direct voltage source, adjustable transformer and rectifier boost device, wherein, institute
The positive pole for stating direct voltage source is connected with the primary side two ends of adjustable transformer respectively with negative pole, in the positive pole of direct voltage source
The second disconnecting link and the 3rd disconnecting link are connected and installed with respectively between the left end and right-hand member of adjustable transformer primary side, in DC voltage
The first disconnecting link is connected and installed between the negative pole in source and the left end of adjustable transformer primary side, rectifier boost device is attempted by can modulation
The two ends of depressor secondary side, the output end and submarine cable of rectifier boost device are electrically connected, to export Pass Test requirement just
Or the voltage of negative polarity is to submarine cable；
Voltage measuring apparatus, itself and submarine cable are electrically connected, the voltage value changes for measuring submarine cable；
Submarine cable insulating paper conductivity measuring apparatus, it is connected with the insulating paper sample of submarine cable, for measuring
The electrical conductivity of submarine cable insulating paper；
Submarine cable insulating oil conductivity measuring apparatus, it is used for the electrical conductivity for measuring submarine cable insulating oil；
Arithmetic processing apparatus, its according to the electrical conductivity of submarine cable insulating paper and the electrical conductivity of submarine cable insulating oil come
Calculation process draws the stored charge of submarine cable.
Above-mentioned submarine cable DC break down voltage test charge accumulation dissipation system also includes control device, the control device
Connected with the first disconnecting link, the second disconnecting link and the 3rd disconnecting link signal, for controlling the first disconnecting link, the second disconnecting link and the 3rd disconnecting link
Folding.
The rectifier boost device is in series by multiple rectification units, and the rectification unit is by two electric capacity and two rectifiers
The loop of composition is constituted.
The voltage measuring apparatus includes first resistor, second resistance, 3rd resistor, and Voltage measure；Wherein, institute
State first resistor, second resistance and 3rd resistor to be sequentially connected in series, the input of first resistor is connected with submarine cable, the 3rd
The output head grounding of resistance, the voltage of submarine cable is dropped to the voltage of coincidence measurement requirement；The connection of Voltage measure
Between second resistance and 3rd resistor, to measure the voltage value changes of submarine cable.
The submarine cable insulating paper conductivity measuring apparatus includes dc source, ammeter, by guard electrode, protection electricity
Pole, non-guard electrode and insulating paper sample；Wherein, the one side and non-guard electrode of insulating paper sample are in contact, another side and by
Guard electrode and guard electrode are in contact, and guard electrode is arranged at by by the both sides of guard electrode；The positive pole of dc source and not
Guard electrode is electrically connected, and negative pole and is electrically connected by guard electrode, ammeter be connected and installed in dc source positive pole and by
Between guard electrode；The negative pole of a guard electrode therein and dc source is grounded.
The submarine cable insulating oil conductivity measuring apparatus includes tubular external electrode, is arranged at interior in external electrode
Electrode, the gap between external electrode and interior electrode forms insulating oil filling channel, steam vent is provided with interior electrode, to prevent
Insulating oil aerogenesis in insulating oil filling channel is internally formed pressure to insulating oil filling channel；Thermometric is formed with interior electrode
Hole, the temperature for measuring insulating oil；Insulation board is connected and installed between the upper end of inner and outer electrodes, to cause interior electricity
Pole and the electric insulation of external electrode；The lower surface of insulation board is provided with shading ring, to cause inner and outer electrodes end
Electric field is pressed；Shielding cap is installed in the upper surface of insulation board, to shield the electromagnetic interference of outside；External electrode and interior electrode difference
It is electrically connected with the positive pole and negative pole of dc source, ammeter is connected and installed between the negative pole and interior electrode of dc source.
The arithmetic processing apparatus draws the stored charge Q of bottom cable by equation below come calculation process：
Q=J × A × D
In formula：J is the stored charge of submarine cable unit cross section；V be voltage produce and dissipation device produced by just
Polar voltages, e is the truth of a matter of natural logrithm；T is that voltage is produced and dissipation device meets test request to submarine cable application
The time of positive polarity voltage；γ 1 is the electrical conductivity of submarine cable insulating paper；γ 2 is the electrical conductivity of submarine cable insulating oil；D1 is
The thickness of submarine cable insulating paper；D2 is the thickness of submarine cable insulating oil；ε 0, ε 1, ε 2 value is respectively 8.85X10-12,
4.1,2.3；A is the cross-sectional area of submarine cable；D is the length of submarine cable.
A kind of to test the method that the accumulation of submarine cable DC break down voltage test charge is dissipated, methods described comprises the following steps：
S1, using submarine cable insulating paper conductivity measuring apparatus and submarine cable insulating oil conductivity measuring apparatus come
The insulating paper conductivity gamma 1 of submarine cable and the insulating oil conductivity gamma 2 of submarine cable are measured respectively；
S2, voltage are produced and dissipation device applies the positive polarity for meeting test request according to the time of setting to submarine cable
Voltage, to examine the insulation resistance of submarine cable；
S3, according to equation below come the stored charge Q of calculation process submarine cable
Q=J × A × D
In formula：J is the stored charge of submarine cable unit cross section；V be voltage produce and dissipation device produced by just
Polar voltages, e is the truth of a matter of natural logrithm；T is that voltage is produced and dissipation device meets test request to submarine cable application
The time of positive polarity voltage；γ 1 is the electrical conductivity of insulating paper；γ 2 is the electrical conductivity of insulating oil；D1 is submarine cable insulating paper
Thickness；D2 is the thickness of submarine cable insulating oil；ε 0, ε 1, ε 2 value is respectively 8.85X10-12, 4.1,2.3；A is submarine cable
Cross-sectional area；D is the length of submarine cable；
S4, voltage are produced and dissipation device applies the reverse voltage for meeting test request to submarine cable, and according to step
The stored charge value J of rapid S3 submarine cable unit cross section carrys out calculation process and show that submarine cable Insulation Test is dissipated after pressure-resistant
The output time of space charge；
S5, when the magnitude of voltage of submarine cable drops to the voltage range for meeting safety requirements, it is complete by sea earth
Into electric discharge.
In the step S2, the device for generating voltage is to submarine cable by the way of continuous pressure, and pressurization is originated
Stage regulation relaxes, interstage average rate pressure regulation soon, when the magnitude of voltage of submarine cable exceedes the 75% of test request magnitude of voltage
When, pressure regulation speed is not less than 2%/second of test request magnitude of voltage.
Compared with prior art, its advantage is the present invention：
The submarine cable DC break down voltage test charge accumulation dissipation system of the present invention can effectively examine exchange 500kV seabeds
Cable high-voltage isulation performance, overcomes traditional insulaion resistance effectively to examine the insulation of submarine cable because test voltage is low
The problem of performance is not enough, also can solve the problem that the computational problem of charge accumulation after the experiment of long range 500kV submarine cables, so as to
The electric discharge work for effectively instructing submarine cable insulation pressure-resistant, has great significance to the safe and stable operation of power system, right
Power supply guarantee has important technical support, while bringing great economic benefit.
Brief description of the drawings
The schematic diagram of Fig. 1 the present embodiment submarine cable DC break down voltage test charge accumulation dissipation systems；
Fig. 2 is the structural representation of voltage generation and dissipation device；
Fig. 3 is the structural representation of voltage measuring apparatus；
Fig. 4 is the structural representation of submarine cable insulating paper conductivity measuring apparatus；
Fig. 5 is the structural representation of submarine cable insulating oil conductivity measuring apparatus；
Voltage change curve figure when Fig. 6 is submarine cable testing experiment；
In figure：1st, voltage is produced and dissipation device；2nd, voltage measuring apparatus；3rd, the conductivity measurement of submarine cable insulating paper is filled
Put；4th, submarine cable insulating oil conductivity measuring apparatus；5th, arithmetic processing apparatus；6th, control device；7th, submarine cable；11st,
One disconnecting link；12nd, the second disconnecting link；13rd, the 3rd disconnecting link；21st, Voltage measure；31st, insulating paper sample；32nd, not guard electrode；33、
By guard electrode；34th, guard electrode；51st, external electrode；52nd, interior electrode；53rd, insulating oil filling channel；54th, steam vent；55th, absolutely
Listrium；56th, shading ring；57th, shielding cap.
Embodiment
Present disclosure is described in further details with reference to the accompanying drawings and detailed description.
Embodiment 1
As shown in figure 1, the bright submarine cable DC break down voltage test charge accumulation dissipation system that the present embodiment is provided includes
Voltage is produced and dissipation device 1, specifically, as shown in Fig. 2 the voltage is produced and dissipation device includes 380V DC voltage
Source, adjustable transformer and rectifier boost device, wherein, the positive pole and negative pole of the direct voltage source respectively with adjustable transformer one
Secondary side two ends are connected, and connection is pacified respectively between the positive pole of direct voltage source and the left end and right-hand member of adjustable transformer primary side
Equipped with the second disconnecting link 12 and the 3rd disconnecting link 13, connected between the negative pole of direct voltage source and the left end of adjustable transformer primary side
First disconnecting link 11 is installed, in this way, when the second disconnecting link 12 is closed and the first disconnecting link 11 and the 3rd disconnecting link 13 are opened, direct current
Potential source then output cathode voltage, and when the first disconnecting link 11 and the 3rd disconnecting link 13 are closed, the second disconnecting link 12 is opened, DC voltage
Source then output negative pole voltage；Rectifier boost device is attempted by the two ends of adjustable transformer secondary side, that is to say, that adjustable transformer
The magnitude of voltage U1 of output will turn into the input voltage of rectifier boost device, and the rectifier boost device is connected by multiple rectification units
Form, the number of rectification unit series connection can specifically be set according to the demand of boosting, and specific in the present embodiment, rectification liter
Depressor is in series by 50 rectification units, and the loop that rectification unit is then made up of 2 electric capacity C and 2 rectifier D
Constituted, that is to say, that whole rectifier boost utensil has 100 electric capacity and 100 voltages, realizes export adjustable transformer
Voltage U1 is rectified into 100U1, so that the test voltage for meeting insulating properties test request is exported to submarine cable, in the present embodiment
In, rectifier boost device will export 600kV voltage into submarine cable 7, the problem of insulating properties to examine submarine cable
In this way, i.e. traditional insulaion resistance can be solved can not effectively examine asking for submarine cable insulating properties because test voltage is low
Topic.Meanwhile, above-mentioned voltage is produced and dissipation device can reach following performance indications：Input power：AC380V ± 10%,
50Hz ± 1%；Output voltage pointing accuracy：<1 grade；Output current pointing accuracy：<1 grade；Ripple factor：≤ 0.5%；0.75 times
Output voltage pointing accuracy：<1 grade, band is latched.
Specifically, in the present embodiment, above-mentioned adjustable transformer uses the S11- of Henan Yu Bian electrician Co., Ltd
M-30/10 model adjustable transformers, capacitor uses the SE-2R5 capacitors of Jinzhou Kaimei Energy Co., Ltd., rectifier
Use CBRHDSH1-40L the or CBRHDSH2-40 type rectifiers of Central Semiconductor companies.
In addition, causing charge accumulation to calculate in the process of the test that insulating properties are examined to efficiently solve submarine cable
The problem of, voltage measuring apparatus 2 is also electrically connected with the submarine cable 7, is used to measure the process of the test mistake of submarine cable 7 to measure
Voltage change in journey, is up to 600kV voltages, generally conventional voltage-measuring equipment is can not due to what submarine cable was accessed
The voltage change of submarine cable is measured, as shown in figure 3, the voltage measuring apparatus 2 of the application is by first resistor R1, the second electricity
Resistance R2,3rd resistor R3 and Voltage measure 21 are constituted；Wherein, first resistor R1, second resistance R2 and the 3rd electricity
Resistance R3 is sequentially connected in series, and first resistor R1 input is connected with submarine cable, 3rd resistor R2 output head grounding, and voltage is surveyed
The input of measuring device 21 is connected between second resistance R2 and 3rd resistor R3, output head grounding, in this way, first resistor R1,
After second resistance R2 and 3rd resistor R3 decompression successively, 600kV voltage can be dropped to below 5v measurement range, voltage
Measuring appliance 21, then can be according to so as to measure voltage change of the submarine cable during the pressure-resistant examination of Insulation Test
One resistance R1, second resistance R2 and 3rd resistor R2 resistance value can Extrapolation draw submarine cable virtual voltage change
Value.Specifically, above-mentioned first resistor R1 and second resistance R2 use Shanghai Cheng Yang instrument and meters Co., Ltd
BZ9/1 high value standard resistance models, 3rd resistor R3 uses the BZ3 direct current standards of Shanghai Cheng Yang instrument and meters Co., Ltd
Resistance, Voltage measure 21 uses the JDZ1-1/JDZ2-1/JDZ3-1 voltage transformers of JOSEF companies.Above-mentioned seabed
DC testing of cables charge accumulation dissipation system also includes submarine cable insulating paper conductivity measuring apparatus 3, itself and seabed
The insulating paper sample of cable is connected, the electrical conductivity for measuring submarine cable insulating paper；Submarine cable insulating oil electrical conductivity is surveyed
Device 4 is measured, it is used for the electrical conductivity for measuring submarine cable insulating oil, in this way, arithmetic processing apparatus 5 insulate according to according to submarine cable
Calculation process draws the stored charge of submarine cable since the electrical conductivity of paper and the electrical conductivity of submarine cable insulating oil, with
Afterwards by the way that the first disconnecting link and the 3rd disconnecting link are closed, the second disconnecting link is opened, then to the voltage of submarine cable output negative pole, to sea
The electric charge of bottom cable accumulation is dissipated, when the magnitude of voltage of submarine cable drops to safe range value, it is possible to seabed electricity
Cable carries out further ground connection electric discharge, blind to prevent so as to effectively instruct the electric discharge work that submarine cable insulation is pressure-resistant
The presence of mesh electric discharge, reduces the possibility that damage is caused to testing crew injury and equipment, and the safety and stability to power system is transported
Row has great significance.
Meanwhile, in order to improve the accuracy and efficiency of disconnecting link closure, above-mentioned submarine cable DC break down voltage test charge
Accumulation dissipation system also include control device 6, the control device 6 respectively with the first disconnecting link 11, the second disconnecting link 12 and the 3rd knife
The signal of lock 13 is connected, for controlling the first disconnecting link 11, the second disconnecting link 12 and the folding of the 3rd disconnecting link 13.
Specifically, as shown in figure 4, above-mentioned submarine cable insulating paper conductivity measuring apparatus 3 includes dc source, electric current
Table, by guard electrode 33, not guard electrode 34, guard electrode 32 and insulating paper sample 31；Wherein, the insulating paper sample 31 be with
Insulating paper in submarine cable is identical material, and both have an identical electrical conductivity, the one side of insulating paper sample 31 and is not protected
Shield electrode 32 is in contact, and another side and is in contact by guard electrode 33 and guard electrode 34, guard electrode 34 is arranged at and protected
The both sides of electrode 33, so that prevent will not be because insulating paper sample 31 is breakdown and damages during test by guard electrode 33
It is bad；The positive pole of dc source and non-guard electrode 32 are electrically connected, and negative pole and are electrically connected by guard electrode 33, ammeter connection
It is installed on the positive pole of dc source and by between guard electrode 33, the negative pole of a guard electrode 34 therein and dc source connects
Ground, in this way, by just can accurately measure the current value during insulating paper sample test with the present apparatus, by writing down electricity
Flow, the electric current I1 on 32, is that submarine cable insulating paper conductivity gamma 1 can be drawn with calculation process by equation below：
γ 1=I1*h/ (U1*A)
In formula：H is the thickness of insulating paper sample；U1 is the voltage of dc source；A is the cross section face of insulating paper sample
Product.
As shown in figure 5, above-mentioned submarine cable insulating oil conductivity measuring apparatus 5 includes tubular external electrode 51, if
The interior electrode 52 being placed in external electrode 51, the gap between external electrode 51 and interior electrode 52 forms insulating oil filling channel 53,
52 are provided with steam vent 54 in interior electrode, to prevent the insulating oil aerogenesis in insulating oil filling channel 53 to insulating oil filling channel
53 are internally formed pressure；Thermometer hole 54 is formed with interior electrode 52, the temperature for measuring insulating oil；In interior electrode 52 and outside
Insulation board 55 is connected and installed between the upper end of electrode 51, to cause the electric insulation of interior electrode 52 and external electrode 51；In insulation
The lower surface of plate 55 is provided with shading ring 56, to cause interior electrode 52 and the electric field of the end of external electrode 51 to press；In insulation board 55
Upper surface shielding cap 57 is installed, with shield outside electromagnetic interference；External electrode 51 and interior electrode 52 are respectively and dc source
Positive pole and negative pole be electrically connected, be connected and installed with ammeter between the negative pole and interior electrode of dc source, in this way, in this way,
By just can accurately measure the current value in insulating oil test process with the present apparatus, pass through the electric current on recording ammeter
I2, is that the conductivity gamma 2 of submarine cable insulating oil can be drawn with calculation process by equation below：
γ 2=I2/ (U2*11.3*18)
In formula：U2 is the voltage of dc source；11.3 form factors；18 be form factor.
Last arithmetic processing apparatus is that the stored charge of submarine cable can be drawn with calculation process according to equation below：
Q=J × A × D
In formula：J is the stored charge of submarine cable unit cross section；V be voltage produce and dissipation device produced by just
Polar voltages, e is the truth of a matter of natural logrithm；T is that voltage is produced and dissipation device meets test request to submarine cable application
The time of positive polarity voltage；γ 1 is the electrical conductivity of insulating paper；γ 2 is the electrical conductivity of insulating oil；D1 is submarine cable insulating paper
Thickness；D2 is the thickness of submarine cable insulating oil；ε 0, ε 1, ε 2 value is respectively 8.85X10-12, 4.1,2.3；A is submarine cable
Cross-sectional area；D is the length of submarine cable.
It can thus be appreciated that the submarine cable DC break down voltage test charge accumulation dissipation system of the present invention can effectively examine exchange
500kV submarine cable high-voltage isulation performances, overcome traditional insulaion resistance effectively to examine seabed because test voltage is low
The problem of insulating properties of cable are not enough, also can solve the problem that the calculating of charge accumulation after the experiment of long range 500kV submarine cables
Problem, so as to effectively instruct the electric discharge work that submarine cable insulation is pressure-resistant, has emphatically to the safe and stable operation of power system
The meaning wanted, there is important technical support to power supply guarantee, while bringing great economic benefit.
Embodiment 2
A kind of to test the method that the accumulation of submarine cable DC break down voltage test charge is dissipated, methods described specifically includes following step
Suddenly：
S1, fill by using submarine cable insulating paper conductivity measuring apparatus and the conductivity measurement of submarine cable insulating oil
Put the insulating paper conductivity gamma 1 for measuring submarine cable respectively and the insulating oil conductivity gamma 2 of submarine cable；Specifically, should
Submarine cable insulating paper conductivity measuring apparatus and submarine cable insulating oil conductivity measuring apparatus use institute in embodiment 1
The submarine cable insulating paper conductivity measuring apparatus and submarine cable insulating oil conductivity measuring apparatus stated.
S2, voltage are produced and dissipation device applies 600kV positive polarity voltage according to the time of setting to submarine cable, with
Examine the insulation resistance of submarine cable；Specifically, voltage generation and dissipation device use the voltage described in embodiment 1
Produce and dissipation device, that is to say, that during normal insulation is pressure-resistant Performance Assessment, close the second disconnecting link, the first disconnecting link and the 3rd knife
Lock is stayed open, using continuous pressure to pressure voltage (600kV), and the regulation of pressure regulation initial period should relatively relax, Yi Mianhai
The equipment output current that bottom cable charging current causes transfinites tripping operation, the interstage should very fast and average rate pressure regulation, when voltage exceedes examination
Electrical verification pressure (600kV) 75% when, pressure regulation speed is not lower than for 2%/second, in order to avoid cause submarine cable when close to test voltage
Pressure-resistant time it is long.Specific experiment pressuring curve as shown in fig. 6, in figure t1 be on submarine cable voltage from zero to test voltage
Time used, it should be not more than 2 minutes, t2 is 1 hour of tested device pressure-resistant time in figure.
S3, the stored charge Q according to equation below calculation process submarine cable
Q=J × A × D
In formula：J is the stored charge of submarine cable unit cross section；V be voltage produce and dissipation device produced by just
Polar voltages, e is the truth of a matter of natural logrithm；T is that voltage is produced and dissipation device meets test request to submarine cable application
The time of positive polarity voltage, i.e., 60 minute；γ 1 is the electrical conductivity of insulating paper；γ 2 is the electrical conductivity of insulating oil；D1 is seabed electricity
The thickness of cable insulating paper；D2 is the thickness of submarine cable insulating oil；ε 0, ε 1, ε 2 value is respectively 8.85X10-12, 4.1,2.3；A
For the cross-sectional area of submarine cable；D is the length of submarine cable；
S4, voltage are produced and dissipation device applies 1.5 times of negative polarity test voltage to submarine cable, i.e. -900kV,
That is, it is necessary to the first disconnecting link and the 3rd disconnecting link are closed, opening the second disconnecting link, and adjust adjustable transformer to export -900kV
Voltage draw seabed to submarine cable, and according to the stored charge value calculation process of step S3 submarine cable unit cross section
Cable insulation tests the output time of pressure-resistant rear dissipation space charge, that is to say, that by changing step S3 formulasMiddle time t range size, until electric charge in this step
When stored charge value J error is less than 2% when accumulating J calculation process value with insulating pressure-resistant in step S3, calculation process terminates,
Gone to sea so as to calculation process time of the pressure-resistant rear electric-charge-dissipating of bottom cable insulation, by computing, in the present embodiment, electric charge
Resolution time be 1 minute.
S5, submarine cable voltage value changes are observed by the voltage measuring apparatus in embodiment 1, when the electricity of submarine cable
Pressure value drops to safe voltage scope, such as during 10kV, by sea earth, further to be discharged, to avoid pair
Testing crew damages and equipment is caused to damage.
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 DC break down voltage test charge accumulation dissipation system, it is characterised in that including
Voltage is produced and dissipation device, and it includes direct voltage source, adjustable transformer and rectifier boost device, wherein, it is described straight
Stream voltage source positive pole be connected respectively with the primary side two ends of adjustable transformer with negative pole, direct voltage source positive pole and can
The second disconnecting link and the 3rd disconnecting link are connected and installed with respectively between the left end and right-hand member of voltage regulator/transformer primary side, in direct voltage source
The first disconnecting link is connected and installed between the left end of negative pole and adjustable transformer primary side, rectifier boost device is attempted by adjustable transformer
The two ends of secondary side, the output end and submarine cable of rectifier boost device are electrically connected, to export the positive or negative of Pass Test requirement
The voltage of polarity is to submarine cable；
Voltage measuring apparatus, itself and submarine cable are electrically connected, the voltage value changes for measuring submarine cable；
Submarine cable insulating paper conductivity measuring apparatus, it is connected with the insulating paper sample of submarine cable, for measuring seabed
The electrical conductivity of cable insulating paper；
Submarine cable insulating oil conductivity measuring apparatus, it is used for the electrical conductivity for measuring submarine cable insulating oil；
Arithmetic processing apparatus, it is according to the electrical conductivity of submarine cable insulating paper and the electrical conductivity of submarine cable insulating oil come computing
Processing draws the stored charge of submarine cable.
2. submarine cable DC break down voltage test charge accumulation dissipation system as claimed in claim 1, it is characterised in that also include
Control device, the control device and the first disconnecting link, the second disconnecting link and the connection of the 3rd disconnecting link signal, for controlling the first knife
The folding of lock, the second disconnecting link and the 3rd disconnecting link.
3. submarine cable DC break down voltage test charge accumulation dissipation system as claimed in claim 1, it is characterised in that described whole
Stream booster is in series by multiple rectification units, the loop institute group that the rectification unit is made up of two electric capacity and two rectifiers
Into.
4. submarine cable DC break down voltage test charge accumulation dissipation system as claimed in claim 1, it is characterised in that the electricity
Pressure measuring device includes first resistor, second resistance, 3rd resistor, and Voltage measure；Wherein, the first resistor,
Two resistance and 3rd resistor are sequentially connected in series, and the input of first resistor is connected with submarine cable, the output end of 3rd resistor
Ground connection, the voltage of submarine cable is dropped to the voltage of coincidence measurement requirement；Voltage measure be connected to second resistance and
Between 3rd resistor, to measure the voltage value changes of submarine cable.
5. submarine cable DC break down voltage test charge accumulation dissipation system as claimed in claim 1, it is characterised in that the sea
Bottom cable insulating paper conductivity measuring apparatus includes dc source, ammeter, by guard electrode, guard electrode, non-guard electrode
And insulating paper sample；Wherein, the one side and non-guard electrode of insulating paper sample are in contact, another side and by guard electrode and protection
Contact electrode, guard electrode is arranged at by by the both sides of guard electrode；The positive pole of dc source is mutually electrically connected with not guard electrode
Connect, negative pole and be electrically connected by guard electrode, ammeter is connected and installed in the positive pole of dc source and by between guard electrode；Its
In a guard electrode and the negative pole of dc source be grounded.
6. submarine cable DC break down voltage test charge accumulation dissipation system as claimed in claim 1, it is characterised in that the sea
Bottom cable insulating oil conductivity measuring apparatus includes tubular external electrode, is arranged at the interior electrode in external electrode, external electrode and
Gap between interior electrode forms insulating oil filling channel, and steam vent is provided with interior electrode, to prevent insulating oil filling logical
Insulating oil aerogenesis in road is internally formed pressure to insulating oil filling channel；Thermometer hole is formed with interior electrode, for measuring
The temperature of insulating oil；Insulation board is connected and installed between the upper end of inner and outer electrodes, to cause inner and outer electrodes
Electric insulation；The lower surface of insulation board is provided with shading ring, to cause the electric field of inner and outer electrodes end to press；
The upper surface of insulation board is provided with shielding cap, to shield the electromagnetic interference of outside；External electrode and interior electrode are respectively and dc source
Positive pole and negative pole be electrically connected, be connected and installed with ammeter between the negative pole and interior electrode of dc source.
7. submarine cable DC break down voltage test charge accumulation dissipation system as claimed in claim 1, it is characterised in that the fortune
Calculate the stored charge Q that processing unit draws bottom cable by equation below come calculation process：
Q=J × A × D
<mrow>
<mi>J</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>&gamma;</mi>
<mn>2</mn>
</mrow>
<mrow>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>1</mn>
<mo>+</mo>
<mi>&gamma;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>2</mn>
</mrow>
</mfrac>
<mi>V</mi>
<mo>+</mo>
<mfrac>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<mi>&epsiv;</mi>
<mn>1</mn>
<mi>&gamma;</mi>
<mn>2</mn>
<mo>-</mo>
<mi>&epsiv;</mi>
<mn>2</mn>
<mi>&gamma;</mi>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mi>d</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
</mrow>
<mrow>
<mo>(</mo>
<mi>&epsiv;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
<mo>+</mo>
<mi>&epsiv;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>)</mo>
<mo>(</mo>
<mi>&gamma;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
<mo>+</mo>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mfrac>
<msup>
<mi>Ve</mi>
<mrow>
<mo>-</mo>
<mi>t</mi>
<mo>/</mo>
<mi>&tau;</mi>
</mrow>
</msup>
</mrow>
<mrow>
<mi>&tau;</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&epsiv;</mi>
<mn>0</mn>
<mi>&epsiv;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>+</mo>
<mi>&epsiv;</mi>
<mn>0</mn>
<mi>&epsiv;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
</mrow>
<mrow>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>+</mo>
<mi>&gamma;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
</mrow>
</mfrac>
</mrow>
In formula：J is the stored charge of submarine cable unit cross section；V is the positive polarity produced by voltage generation and dissipation device
Voltage, e is the truth of a matter of natural logrithm；T is that voltage is produced and dissipation device applies the positive pole for meeting test request to submarine cable
The time of property voltage；γ 1 is the electrical conductivity of submarine cable insulating paper；γ 2 is the electrical conductivity of submarine cable insulating oil；D1 is seabed
The thickness of cable insulating paper；D2 is the thickness of submarine cable insulating oil；ε 0, ε 1, ε 2 value is respectively 8.85X10-12, 4.1,
2.3；A is the cross-sectional area of submarine cable；D is the length of submarine cable.
8. a kind of test the method that the accumulation of submarine cable DC break down voltage test charge is dissipated, it is characterised in that methods described includes
Following steps：
S1, distinguished using submarine cable insulating paper conductivity measuring apparatus and submarine cable insulating oil conductivity measuring apparatus
Measure the insulating paper conductivity gamma 1 of submarine cable and the insulating oil conductivity gamma 2 of submarine cable；
S2, voltage are produced and dissipation device applies the positive polarity electricity for meeting test request according to the time of setting to submarine cable
Pressure, to examine the insulation resistance of submarine cable；
S3, the stored charge Q that submarine cable is drawn according to equation below come calculation process
Q=J × A × D
<mrow>
<mi>J</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>&gamma;</mi>
<mn>2</mn>
</mrow>
<mrow>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>1</mn>
<mo>+</mo>
<mi>&gamma;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>2</mn>
</mrow>
</mfrac>
<mi>V</mi>
<mo>+</mo>
<mfrac>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<mi>&epsiv;</mi>
<mn>1</mn>
<mi>&gamma;</mi>
<mn>2</mn>
<mo>-</mo>
<mi>&epsiv;</mi>
<mn>2</mn>
<mi>&gamma;</mi>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mi>d</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
</mrow>
<mrow>
<mo>(</mo>
<mi>&epsiv;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
<mo>+</mo>
<mi>&epsiv;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>)</mo>
<mo>(</mo>
<mi>&gamma;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
<mo>+</mo>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mfrac>
<msup>
<mi>Ve</mi>
<mrow>
<mo>-</mo>
<mi>t</mi>
<mo>/</mo>
<mi>&tau;</mi>
</mrow>
</msup>
</mrow>
<mrow>
<mi>&tau;</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&epsiv;</mi>
<mn>0</mn>
<mi>&epsiv;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>+</mo>
<mi>&epsiv;</mi>
<mn>0</mn>
<mi>&epsiv;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
</mrow>
<mrow>
<mi>&gamma;</mi>
<mn>1</mn>
<mi>d</mi>
<mn>2</mn>
<mo>+</mo>
<mi>&gamma;</mi>
<mn>2</mn>
<mi>d</mi>
<mn>1</mn>
</mrow>
</mfrac>
</mrow>
In formula：J is the stored charge of submarine cable unit cross section；V is the positive polarity produced by voltage generation and dissipation device
Voltage, e is the truth of a matter of natural logrithm；T is that voltage is produced and dissipation device applies the positive pole for meeting test request to submarine cable
The time of property voltage；γ 1 is the electrical conductivity of insulating paper；γ 2 is the electrical conductivity of insulating oil；D1 is the thickness of submarine cable insulating paper
Degree；D2 is the thickness of submarine cable insulating oil；ε 0, ε 1, ε 2 value is respectively 8.85X10-12, 4.1,2.3；A is submarine cable
Cross-sectional area；D is the length of submarine cable；
S4, voltage are produced and dissipation device applies the reverse voltage for meeting test request to submarine cable, and according to step S3
The stored charge value J of submarine cable unit cross section carry out calculation process and draw the pressure-resistant rear dissipation space of submarine cable Insulation Test
The output time of electric charge；
S5, when the magnitude of voltage of submarine cable drops to the voltage range for meeting safety requirements, sea earth completes to put
Electricity.
9. the method that the accumulation of test submarine cable DC break down voltage test charge is dissipated as claimed in claim 8, it is characterised in that
In the step S2, the device for generating voltage is to submarine cable by the way of continuous pressure, and pressurization initial period is adjusted
Relax, interstage average rate pressure regulation soon, when the magnitude of voltage of submarine cable exceedes the 75% of test request magnitude of voltage, pressure regulation speed
Degree is not less than 2%/second of test request magnitude of voltage.
10. the method that the accumulation of test submarine cable DC break down voltage test charge is dissipated as claimed in claim 8, its feature exists
In, the voltage is produced and dissipation device includes direct voltage source, adjustable transformer and rectifier boost device, wherein, it is described straight
Stream voltage source positive pole be connected respectively with the primary side two ends of adjustable transformer with negative pole, direct voltage source positive pole and can
The second disconnecting link and the 3rd disconnecting link are connected and installed with respectively between the left end and right-hand member of voltage regulator/transformer primary side, in direct voltage source
The first disconnecting link is connected and installed between the left end of negative pole and adjustable transformer primary side, rectifier boost device is attempted by adjustable transformer
The two ends of secondary side, the output end and submarine cable of rectifier boost device are electrically connected；The rectifier boost device is by multiple rectification lists
Member is in series, and the loop that the rectification unit is made up of two electric capacity and two rectifiers is constituted；
The submarine cable insulating paper conductivity measuring apparatus include dc source, ammeter, by guard electrode, guard electrode,
Not guard electrode and insulating paper sample；Wherein, the one side and non-guard electrode of insulating paper sample are in contact, and another side and are protected
Electrode and guard electrode are in contact, and guard electrode is arranged at by by the both sides of guard electrode；The positive pole of dc source and do not protect
Electrode is electrically connected, and negative pole and is electrically connected by guard electrode, and ammeter is connected and installed in the positive pole of dc source and protected
Between electrode；The negative pole of a guard electrode therein and dc source is grounded；
The submarine cable insulating oil conductivity measuring apparatus includes tubular external electrode, is arranged at the interior electricity in external electrode
Pole, the gap between external electrode and interior electrode forms insulating oil filling channel, and steam vent is provided with interior electrode, to prevent absolutely
Insulating oil aerogenesis in edge oil filling channel is internally formed pressure to insulating oil filling channel；Thermometric is formed with interior electrode
Hole, the temperature for measuring insulating oil；Insulation board is connected and installed between the upper end of inner and outer electrodes, to cause interior electricity
Pole and the electric insulation of external electrode；The lower surface of insulation board is provided with shading ring, to cause inner and outer electrodes end
Electric field is pressed；Shielding cap is installed in the upper surface of insulation board, to shield the electromagnetic interference of outside；External electrode and interior electrode difference
It is electrically connected with the positive pole and negative pole of dc source, ammeter is connected and installed between the negative pole and interior electrode of dc source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710601572.9A CN107271871B (en) | 2017-07-21 | 2017-07-21 | Submarine cable direct-current withstand voltage test charge accumulation dissipation system and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710601572.9A CN107271871B (en) | 2017-07-21 | 2017-07-21 | Submarine cable direct-current withstand voltage test charge accumulation dissipation system and test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107271871A true CN107271871A (en) | 2017-10-20 |
| CN107271871B CN107271871B (en) | 2023-05-16 |
Family
ID=60079396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710601572.9A Active CN107271871B (en) | 2017-07-21 | 2017-07-21 | Submarine cable direct-current withstand voltage test charge accumulation dissipation system and test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107271871B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596947A (en) * | 2018-12-05 | 2019-04-09 | 合肥能安科技有限公司 | A kind of electric insulation aging monitoring and pre-alarming method, device based on insulation conductance |
| CN111766458A (en) * | 2020-06-03 | 2020-10-13 | 国网山东省电力公司莱芜供电公司 | Current integration-based method for measuring accumulated charges of insulating materials of direct-current high-voltage equipment |
| CN112461386A (en) * | 2020-11-26 | 2021-03-09 | 江苏省电力试验研究院有限公司 | Method for calculating discharge resistance temperature in high-voltage direct-current submarine cable test |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002022792A (en) * | 2000-07-05 | 2002-01-23 | Osaka Gas Co Ltd | Withstand voltage testing device for insulating oil |
| CN101915880A (en) * | 2010-07-26 | 2010-12-15 | 南京电气（集团）有限责任公司 | DC insulator ionic migration test synthesis system |
| CN102818974A (en) * | 2012-07-13 | 2012-12-12 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for evaluating aging degree of main insulation of transformer |
| CN103197171A (en) * | 2013-03-01 | 2013-07-10 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Evaluation method for paper oil insulation aging state through characteristic parameters based on time domain dielectric response |
| CN105004971A (en) * | 2015-05-29 | 2015-10-28 | 广西电网有限责任公司电力科学研究院 | Method and apparatus for detecting insulating medium spectrum and insulating state withstand voltage of cable |
| CN206114837U (en) * | 2016-10-31 | 2017-04-19 | 内蒙古电力（集团）有限责任公司内蒙古超高压供电局 | Experiment physical model device of simulation oil -immersed transformer insulating properties test |
| CN207380179U (en) * | 2017-07-21 | 2018-05-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Submarine cable DC break down voltage test charge accumulates dissipation system |
-
2017
- 2017-07-21 CN CN201710601572.9A patent/CN107271871B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002022792A (en) * | 2000-07-05 | 2002-01-23 | Osaka Gas Co Ltd | Withstand voltage testing device for insulating oil |
| CN101915880A (en) * | 2010-07-26 | 2010-12-15 | 南京电气（集团）有限责任公司 | DC insulator ionic migration test synthesis system |
| CN102818974A (en) * | 2012-07-13 | 2012-12-12 | 云南电力试验研究院（集团）有限公司电力研究院 | Method for evaluating aging degree of main insulation of transformer |
| CN103197171A (en) * | 2013-03-01 | 2013-07-10 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Evaluation method for paper oil insulation aging state through characteristic parameters based on time domain dielectric response |
| CN105004971A (en) * | 2015-05-29 | 2015-10-28 | 广西电网有限责任公司电力科学研究院 | Method and apparatus for detecting insulating medium spectrum and insulating state withstand voltage of cable |
| CN206114837U (en) * | 2016-10-31 | 2017-04-19 | 内蒙古电力（集团）有限责任公司内蒙古超高压供电局 | Experiment physical model device of simulation oil -immersed transformer insulating properties test |
| CN207380179U (en) * | 2017-07-21 | 2018-05-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Submarine cable DC break down voltage test charge accumulates dissipation system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596947A (en) * | 2018-12-05 | 2019-04-09 | 合肥能安科技有限公司 | A kind of electric insulation aging monitoring and pre-alarming method, device based on insulation conductance |
| CN109596947B (en) * | 2018-12-05 | 2022-01-04 | 杭州善瑟科技有限公司 | Electrical insulation aging monitoring and early warning method and device based on insulation conductance |
| CN111766458A (en) * | 2020-06-03 | 2020-10-13 | 国网山东省电力公司莱芜供电公司 | Current integration-based method for measuring accumulated charges of insulating materials of direct-current high-voltage equipment |
| CN112461386A (en) * | 2020-11-26 | 2021-03-09 | 江苏省电力试验研究院有限公司 | Method for calculating discharge resistance temperature in high-voltage direct-current submarine cable test |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107271871B (en) | 2023-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2015032343A1 (en) | Testing system of gis electronic mutual inductor and method therefor | |
| CN103001235B (en) | Method for evaluating risks of MOV (metal oxide varistor) of series capacitive compensator | |
| CN103091609A (en) | Performance detecting system and method thereof of gas insulated substation (GIS) partial discharge on-line monitoring device | |
| Zou et al. | Novel transient-energy-based directional pilot protection method for HVDC line | |
| CN107271871A (en) | Submarine cable DC break down voltage test charge accumulation dissipation system and method for testing | |
| CN104777366A (en) | High-voltage insulation resistance testing device for anti-interference power transmission line | |
| CN108037429A (en) | A kind of direct current arrester long wave screening test device and method | |
| CN207380179U (en) | Submarine cable DC break down voltage test charge accumulates dissipation system | |
| CN207081804U (en) | A kind of submarine cable high-voltage isulation performance test system | |
| CN107356824A (en) | A kind of submarine cable DC break down voltage test charge cumulative measurement system and measuring method | |
| CN205539343U (en) | Integration probe is put in office based on electric capacity divides platen press VFTO measuring transducer | |
| Kulshrestha et al. | Identification and classification of faults in utility grid with solar energy using discrete wavelet transform and decision rules | |
| CN207081778U (en) | A kind of submarine cable DC break down voltage test charge cumulative measurement system | |
| CN204515022U (en) | Anti-interference transmission line of electricity high-voltage insulating resistance proving installation | |
| CN203929986U (en) | Measure the test unit of the corona starting characteristic of the super corona of fine rule | |
| CN103267912B (en) | A kind of direct current transportation wall bushing risk evaluating system and methods of risk assessment | |
| CN206773135U (en) | The detecting system of GIS partial discharge characteristic | |
| Kong et al. | A novel disturbance identification method based on empirical mode decomposition for HVDC transmission line protection | |
| Yang et al. | Failure analysis and maintenance of a surge capacitor on the neutral bus in a±500 kV HVDC converter station | |
| CN208399628U (en) | A kind of direct current arrester long wave screening test device | |
| CN203535206U (en) | GIS partial discharging simulation system | |
| Shu et al. | A detection method of high impedance arcing fault for distribution network with distributed generation based on CEEMDAN and TEO algorithm | |
| CN107329061A (en) | A kind of submarine cable high-voltage isulation performance test system and determination method | |
| Gao et al. | Recognition of HVDC Transmission Line Lightning Strike Interference Based on HHT Algorithm | |
| Wang et al. | Protection scheme of offshore wind power AC submarine cable based on correlation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |