CN101329382A - High voltage non-local discharge test power supply for crosslinked cable - Google Patents
High voltage non-local discharge test power supply for crosslinked cable Download PDFInfo
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- CN101329382A CN101329382A CNA2007100422126A CN200710042212A CN101329382A CN 101329382 A CN101329382 A CN 101329382A CN A2007100422126 A CNA2007100422126 A CN A2007100422126A CN 200710042212 A CN200710042212 A CN 200710042212A CN 101329382 A CN101329382 A CN 101329382A
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Abstract
The invention discloses a high-voltage non-partial discharge testing power supply for cross-linked cables, relating to a testing device of electrical property and the testing device of leakage of an electrical device, in particular to the high-voltage non-partial discharge testing power supply for the cross-linked cables. The high-voltage non-partial discharge testing power supply consists of three parts of a high-voltage testing part, a testing part and a control part, wherein, the high-voltage testing part comprises a 10kV/380V independent power supply unit, a dual-shielding electrostatic isolation transformer, a low-voltage notch filter, a voltage regulator, an excitation transformer, a high-voltage reactor, a high-voltage notch filter and a circulating water testing terminal; the testing part comprises a coupling capacitor, a detection unit, a voltage-dividing capacitor, a partial discharge instrument and an oscilloscope; the control part comprises a voltage automatic control circuit, a protection circuit and a test instrument. The high-voltage non-partial discharge testing power supply adopts a precision lead screw with special materials, strength and mechanical properties; furthermore, the structure, the materials and the process of the capacitors in a sleeve are improved, thereby having the advantages of high sensitivity, strong anti-interference performance and being applicable to 110kV.
Description
Technical field
The present invention relates to the proving installation of electrical property and, be specially the high voltage non-local discharge test power supply that is used for crosslinked cable the proving installation of electric equipment leakage.
Background technology
In recent years, carrying out along with China's upgrading urban and rural power grids, 110kV and above cable demand are strengthened day by day, domestic nearly 20 110kV crosslinked cable production lines can't satisfy the demands at present, increasing cable factory begins to prepare increases the 110kV cross-linking production line, therefore also increasing to the demand that testing apparatus is put in corresponding office.Shelf depreciation is a kind of very small discharge, and the order of magnitude of discharge capacity is generally at 10pC, and it embodies with the form of discharge charge amount.The GB regulation is for the crosslinked cable of 110kV, under the industrial frequency experiment voltage of 96kV, the partial discharge quantity of cable can not surpass 10pC, be equal to the pulsed discharge of 0.1V, measure the pulsed discharge of 0.1V under so high trial voltage, its difficulty is well imagined, this should improve the sensitivity of detecting instrument, detect this small discharge, avoid the discharge of equipment itself again, also will improve the antijamming capability of equipment simultaneously, get rid of outside cause, find electric cable stoppage.Because the restriction of domestic production technology and quality of materials, the local discharge test that equipment all can only satisfy 35kV and following crosslinked cable is put in existing homemade office, and 110kV crosslinked cable local discharge test then is a blank.
Summary of the invention
In order to overcome the limitation of prior art, provide a kind of do not have the office put and highly sensitive checkout equipment, the invention discloses a kind of high voltage non-local discharge test power supply that is used for crosslinked cable, the present invention achieves the goal by following technical solution:
A kind of high voltage non-local discharge test power supply that is used for crosslinked cable, be made up of high-potting part, part of detecting, control section three parts, described high-potting partly comprises the independently-powered unit of 10kV/380V, double shield electrostatic isolation transformer, low pressure notch filter, pressure regulator, exciting transformer, high voltage reactor, high pressure notch filter and recirculated water test terminal; The independently-powered unit of 10kV/380V is made up of power transformer and supporting switch cubicle, and its current output terminal connects double shield electrostatic isolation transformer by power cable; The primary coil and the secondary coil of double shield electrostatic isolation transformer all have the electrostatic screening layer, and its current output terminal is connected to the low pressure notch filter by power cable; The low pressure notch filter adopts the passive network of " Л " structure, comprises series inductance and shunt capacitance, and its current output terminal is connected to pressure regulator by power cable; Pressure regulator adopts electronic regulating and controlling, and extreme position is equipped with limit switch, and its current output terminal is connected to high voltage reactor by power cable; The current output terminal of high voltage reactor is connected to the high pressure notch filter by power cable; The high pressure notch filter is formed the L-C filter circuit by inductance and electric capacity, it has 1 current output terminal and 3 signal output parts, its current output terminal is connected to the recirculated water test terminal of testing ground by power cable, have 2 to be connected to the PD meter of part of detecting with measurement signal line in its 3 signal output parts, another signal output part is connected to the oscillograph of part of detecting with measurement signal line; High voltage reactor and high pressure notch filter all are connected to the dividing potential drop electric capacity of part of detecting by common power cable; Recirculated water test terminal inner has deionized water circulating, and its current output terminal is connected to test cable by power cable;
Described part of detecting comprises coupling capacitance, detecting unit, dividing potential drop electric capacity, PD meter and oscillograph; The two ends of coupling capacitance are connected to test cable and detecting unit with measurement signal line respectively, and the other end of detecting unit is connected to PD meter and oscillograph respectively with measurement signal line; PD meter all is connected with control section by power cable with oscillograph;
Described control section comprises voltage self-zeroing circuit, zero start circuit, zero booster circuit, circuit tuning circuit, current foldback circuit, ARC breakdown protection circuit, overvoltage crowbar and gap % table, COSj table, EVM table; Control section is connected by pressure regulator, the high voltage reactor of umbilical cable with the high-potting part, be connected with coupling capacitance, detecting unit and the dividing potential drop electric capacity of part of detecting by measurement signal line, be connected with oscillograph with the PD meter of part of detecting by power cable.
The described high voltage non-local discharge test power supply that is used for crosslinked cable, in the high-potting circuit, the screw rod material of precise ball screw selects for use carbon content at the high-carbon alloy steel more than 0.45% in the high voltage reactor; And make surperficial induction heat treatment; The nut material of precision ball screw is selected the low-carbon alloy steel of following composition for use, and the hardening heat of making carburizing and quenching is handled: C content 0.12%～0.24%, si content 0.17%～0.40%, contain Mn amount 0.40%～0.90%, contain Cr amount 0.40%～1.10%, contain Mo amount 0.15%～0.55%, P content≤0.04% contains S amount≤0.04%.
The described high voltage non-local discharge test power supply that is used for crosslinked cable, in the high-potting circuit, the high voltage reactor sleeve pipe office of selecting for use is high-volume less than the condenser type bushing of 2pC, the condenser type bushing comprises capacitor core, insulator, conservator and ground connection flange, and be assembled into integral body with brute spring and packing washer, the condenser type bushing adopts the condenser type all-sealed structure, the major insulation capacitor core turns to the concentric column capacitor with cable paper and punching aluminium foil, and do vacuum drying treatment and the processing of vacuum pressure immersion oil, flood condenser oil.
The described high voltage non-local discharge test power supply that is used for crosslinked cable, in the high-potting circuit, the high voltage reactor top is connected to dehydrating breather, dehydrating breather is a columnar container, the lower end divide two by union-screw coupling in fuel tank, side has transparent apertures to communicate with atmosphere, dehydrating breather air in place is provided with oil-sealing arrangement, fill drying agent at internal tank, drying agent is selected silica gel or lime chloride for use.
The described high voltage non-local discharge test power supply that is used for crosslinked cable, in the high-potting circuit, the high pressure notch filter is one three grades and C string L type low-pass filter.
Principle of work of the present invention is as follows:
This test unit is to utilize the principle of series resonance under rated frequency (50Hz) to produce high pressure, the simplification circuit of typical resonance experiment system as shown in Figure 1, variable autotransformer T1 provides from the zero variable AC-input voltage to ratings for exciting transformer T2, exciting transformer T2 supplies with resonant tank power, and test product and electric power loop separated, capacitor C represents test product electric capacity and other shunt capacitance, voltage divider electric capacity for example, capacitance of bushing or the like.Inductor L represents variable reactor, and when its inductance value is adjusted to the capacitive reactance of offsetting capacitor C, the loop will reach resonant condition.
Shown in Figure 2 is the equivalent electrical circuit of series resonance system, supposes that exciting transformer is lossless, and its leakage inductance focuses in the inductance of reactor L, and the total losses of system are represented with resistance in series R.
Can write out following formula:
Under resonant condition, X
L=X
C, promptly
Therefore:
Or U
C=QU (2)
(2) in the formula:
Parameter Q is called the quality factor of resonant tank.For the high-quality capacity load, the Q value of canonical system is between 40～80.Under resonant condition, electric current I in the resonant tank and exciting transformer voltage V homophase, so power input is pure active power, promptly
(
Under the resonant condition), the reactive power on the capacitive load C is in identical condition, that is:
P
C＝U
C×I＝QUI＝QP (3)
(3) in the formula: P is an active power, P
CIt is reactive power
Therefore, the feeder line load, as isolating switch, pressure regulator, the rated capacity of contactor etc. will drop to the 1/Q of required reactive power, and this just means that the capacity requirement to incoming line greatly reduces.
By changing the core of reactor air gap, the minimum value of the inductance of reactor when the maximal value when closed fully changes to iron core air gap and opens fully from iron core serially regulated the inductance value of reactor group, make it and the load capacitance coupling, to reach resonance, at this moment:
(4) in the formula: L is a reactor inductance
C is a load capacitance
ω is an angular frequency
The tuning range of test unit is by the physical dimension decision of reactor, and common reactor can carry out tuning in 4% to 90% iron core air gap scope, and it is very big that degree of regulation and stability are influenced by leading screw.
Tuning range of the present invention is by the physical dimension decision of reactor, and common reactor can carry out tuning in 4% to 90% iron core air gap scope, and it is very big that degree of regulation and stability are influenced by leading screw.In addition, in order to satisfy the test needs, the capacity of reactor reaches 2500kVA, the volume of coil and iron core is very huge, the adjusting of iron core, support and realize by leading screw fully, and necessary again long-term work is under the environment of vibration, also to guarantee suitable precision simultaneously, stability and life-span, common leading screw can't meet the demands, so we have designed special substance, the precision lead screw of intensity and mechanical property, the screw rod material of precision ball screw is selected the high-carbon alloy steel of carbon content more than 0.45% for use, and make surperficial induction heat treatment, and can make material have surface of good hardness and surface abrasion resistance consumption, therefore ball screw assembly, has good precision and serviceable life; Simultaneously since the heart portion of material harden, the tough iron tissue that remains unchanged, tensile strength height and toughness is strong deforms because of the load of impact or ruptures so leading screw is difficult.The nut material is used and is selected trade mark low-carbon alloy steels such as SCM415H, SCM420H, SNCM220 for use, and does the hardening heat processing of carburizing and quenching.
The SCM415H chemical constitution is: C content 0.12%～0.18%, and si content 0.20%～0.40% contains Mn amount 0.40%～0.70%, contains Cr amount 0.80%～1.10%, contains Mo amount 0.40%～0.55%, and P content≤0.04% contains S amount≤0.04%.
The SCM420 chemical constitution is: C content 0.17%～0.24%, and si content 0.17%～0.37% contains Mn amount 0.40%～0.70%, contains Cr amount 0.80%～1.10%, contains Mo amount 0.15%～0.25%, and P content≤0.04% contains S amount≤0.04%.
The SNCM220 chemical constitution is: C content 0.19%～0.23%, and si content 0.20%～0.35% contains Mn amount 0.70%～0.90%, contains Cr amount 0.40%～0.60%, contains Mo amount 0.20%～0.35, and P content≤0.04% contains S amount≤0.04%.
As above selection and thermal treatment make material have surface of good hardness and surface abrasion resistance consumption, and therefore ball-screw has longer serviceable life; Simultaneously because the tough iron tissue that remains unchanged, tensile strength height and toughness is strong are hardened in the heart portion of material.
In order to ensure precision, strict control effective travel deviation ep and stroke variation VUP; The thermal deformation of precision lead screw will cause length, bearing accuracy to change, and thermal deformation can be provided by following formula:
δt＝α×Δt×Lu (5)
(5) in the formula: α---thermal expansivity, get 1.20 * 10
-5
Δ t---temperature rise is got 2～4 ℃
Lu---effective travel, Lu=Lx+2La+Ln or Lu=L1-2Le
L1---full stand of thread
Le---tail
The relation of Lu, Lx, La, Ln, L1, Le as shown in Figure 4.
Control above-mentioned parameter is strict during Design and Machining, in order to compensate because the leading screw length variations that thermal expansion or elastic deformation cause, make the helical pitch of leading screw to such an extent that be a bit larger tham or less than nominal lead, the helical pitch that contains the direction target call of Ti Chuing is the target helical pitch according to actual needs.The target helical pitch multiply by number of active coils on the leading screw target stroke.The difference of target stroke and nominal stroke is deviation of stroke C, and in order to compensate the influence of thermal deformation, deviation of stroke C=δ t (δ t sees formula (5)) also is negative value.
Shelf depreciation is a kind of very small discharge, the GB regulation, crosslinked cable for 110kV, under 90,000 6 kilovolts industrial frequency experiment voltage, the partial discharge quantity of cable can not surpass 10pC, be equal to the pulsed discharge of 0.1V, type approval test to short sample can not surpass 5pC, be equal to the pulsed discharge of 0.05V, to under so high trial voltage, measure so small discharge signal, not only to improve the sensitivity and the antijamming capability of detecting instrument, this occurs so small discharge down in so high voltage also must to prevent reactor, its difficulty is well imagined, common insulating sleeve, capacitance graded bushing all can not meet the demands, and puts index in order to make total system be issued to higher office at the 200kV output voltage, and we improve the structure of electric capacity in the sleeve pipe, material and technology, designed the discharge off condenser-type terminal of 200,000 volts of electric pressures, result of use is fine.
Design employing office is high-volume less than the condenser type bushing of 2pC.Condenser type bushing design has capacitor core, insulator, conservator and ground connection flange etc., and increases brute spring and packing washer is assembled into integral body.Also established for the needs that satisfy physical strength and to have clamped.Conservator can compensate when changing at temperature, pressure oil in the sleeve pipe, and is provided with oil meter, as the usefulness of oil level indication.Flange works to do the fixed installation and the ground connection of sleeve pipe.Flange is provided with measurement terminal and is connected with capacitor core end screen, as the usefulness of sleeve pipe medium, partial discharge quantity measurement.
The condenser type bushing adopts the condenser type all-sealed structure.Carry out in the cleaning air-conditioned room that is wound on strict control of major insulation capacitor core, turn to the concentric column capacitor with quality cables paper and punching aluminium foil, assembling is after immersion method leakage test the 0.2MPa nitrogen pressure under and the leakage rate inspection under the high vacuum, and capacitor core handles by advanced vacuum drying process and vacuum pressure immersion oil technology, and the condenser oil of dipping strictness processing.The condenser type bushing machines the main pilot project in back has dielectric loss measurement, partial discharge quantity measurement, power frequency withstand test, insulation margin test, sealing property inspection and oiliness can test etc., measure through outward appearance and dimension inspection in addition, finally obtained excellent electric property, sealing is reliable, has guaranteed that total system is issued to higher office at the 200kV output voltage and puts index.
Consider that working environment of the present invention has nothing in common with each other, some environment is relatively moister, structure in the past makes moisture be easy to enter reactor inside, since in the past reactor only under 45 kilovoltages survey bureau put, so no problem, but this complete equipment is that survey office puts under 96 kilovoltages now, and withstand test voltage is up to 160 kilovolts, structure in the past can't satisfy requirement of experiment at all, so we are designed to totally enclosed type to reactor, guarantees that reactor is inner long-term dry.In the high-potting circuit, the high voltage reactor top is connected to dehydrating breather, and as shown in Figure 5, dehydrating breather is a columnar container that is welded into steel plate, the lower end divide two by union-screw coupling in fuel tank, side has transparent apertures to communicate with atmosphere.In the actual motion during temperature variation of insulating oil, air-breathing and scavenging action will take place in fuel tank, air passes in and out fuel tank by dehydrating breather, dehydrating breather air in place is provided with oil-sealing arrangement, fill hygroscopic agents such as silica gel or lime chloride at internal tank, suck airborne dust and moisture in order to remove; Because the temperature difference between the upper and lower oil reservoir, make insulating oil form convection current through dehydrating breather from the top down, insulating oil is with after hygroscopic agent contacts, and moisture wherein, dregs, acid and oxide etc. are absorbed, thereby oil is kept clean, guarantee the stable performance of insulating oil.General dehydrating breather is a sorbing material with block silochrom always.Experiment showed, that this material only just has bigger adsorbance when relative humidity is higher, and when relative humidity was low, then adsorbance was very little.Our design is with 84% round shaped grain shape Kiselgel A, and mixing 16% blue-gel indicator is sorbing material, remedied under the block silochrom low humidity after the little and moisture absorption of adsorbance shortcomings such as no color demonstration.Kiselgel A is a kind of high activity sorbing material of micropore shape structure, is spherical, and translucent body has higher physical strength, better chemical stability and thermal stability, and nonhazardous is pollution-free.As can be seen, Kiselgel A is under the low situation of relative humidity from the family curve of the relative humidity of the silochrom of Fig. 6 and Kiselgel A and hydroscopicity, and its wettability power obviously is dominant.The design of dehydrating breather in the use of version and sorbing material, guarantees the dielectric strength of reactor oil, thus the office that guarantees total system discharge water flat can be steady in a long-term.
Because working voltage height of the present invention, it is also high that requirement is put in office, so reduce the discharge capacity of reactor on the one hand by every means, also to manage the discharge and the undesired signal of further filtering reactor on the other hand, for effective filtering from the undesired signal of reactor, the hv filtering device is designed to one three grades and C string L type low-pass filter, and as shown in Figure 7, the die-away curve of this low-pass filter as shown in Figure 8.
With original two-stage hv filtering device change into three grades of filtering and done on the design parameter adjust after, got rid of the influence that changes into after three grades on load parameter system equipment.Fact proved and adopt three grades of filtering to effectively reduce the system background noise, improved the system testing precision.
Description of drawings
Fig. 1 is that the series resonance test device is simplified schematic diagram;
Fig. 2 is the equivalent electrical circuit of series resonance system;
Fig. 3 is a structural representation of the present invention;
The synoptic diagram of Lu, Lx, La, Ln, L1 and Le when Fig. 4 is precision ball screw work;
Fig. 5 is the stereographic map that the high voltage reactor of dehydrating breather is arranged at totally enclosed type and top;
Fig. 6 is the relative humidity of silochrom and Kiselgel A and the family curve of hydroscopicity;
Fig. 7 is high pressure notch filter circuit figure;
Fig. 8 is the die-away curve of high pressure notch filter.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 3, a kind of high voltage non-local discharge test power supply that is used for crosslinked cable is made up of high-potting part 1, part of detecting 2, control section 3 three parts,
High-potting part 1 comprises the independently-powered unit 11 of 10kV/380V, double shield electrostatic isolation transformer 12, low pressure notch filter 13, pressure regulator 14, exciting transformer 15, high voltage reactor 16, high pressure notch filter 17 and recirculated water test terminal 18; 10kV/380V is made up of power transformer and supporting switch cubicle independently-powered unit 11, and its current output terminal connects double shield electrostatic isolation transformer 12 by power cable; The primary coil and the secondary coil of double shield electrostatic isolation transformer 12 all have the electrostatic screening layer, and its current output terminal is connected to low pressure notch filter 13 by power cable; Low pressure notch filter 13 adopts the passive network of " JI " structure, comprises series inductance and shunt capacitance, and its current output terminal is connected to pressure regulator 14 by power cable; Pressure regulator 14 adopts electronic regulating and controlling, and extreme position is equipped with limit switch, and its current output terminal is connected to high voltage reactor 16 by power cable; The current output terminal of high voltage reactor 16 is connected to high pressure notch filter 17 by power cable; High pressure notch filter 17 is formed the L-C filter circuit by inductance and electric capacity, it has 1 current output terminal and 3 signal output parts, its current output terminal is connected to the recirculated water test terminal 18 of testing ground by power cable, have 2 to be connected to the PD meter 24 of part of detecting 2 with measurement signal line in its 3 signal output parts, another signal output part is connected to the oscillograph 25 of part of detecting 2 with measurement signal line; High voltage reactor 16 and high pressure notch filter 17 all are connected to the dividing potential drop electric capacity 23 of part of detecting 2 by common power cable; Recirculated water test terminal 18 inside have deionized water circulating, and its current output terminal is connected to test cable 4 by power cable;
The independently-powered unit 11 of 10kV/380V is mounted in logical power transformer and the supporting switch cubicle thereof of a Daepori in factory's distribution substation, be one tunnel common power supply, but it can not be used to other electrical equipment only for test provides power supply.Its output is connected to the power cabinet of the special use of testing ground by power cable, is connected to the double shield electrostatic isolation transformer 12 that is installed in the test site with cable again through the power cabinet output of this special use.
The primary coil and the secondary coil of double shield electrostatic isolation transformer 12 all have the electrostatic screening layer, and it is used to suppress the undesired signal from power supply in system, and the transmission power supply energy also carries out the electricity isolation with externally fed power supply and pilot system auxiliary power supply.Its output is connected to the low pressure notch filter 13 of testing ground by power cable.
The noise jamming of measuring in the bandwidth is put in the office that low pressure notch filter 13 is mainly used to suppress from power supply, and the sensitivity of test is put in raising office, reduces ground unrest.Passive network is adopted in its design, comprises series inductance and shunt capacitance, and " л " structure has low-pass characteristic, and pass-band loss is little, and high frequency attenuation is big.Its output is connected to the pressure regulator 14 of testing ground by power cable.
High pressure notch filter 17 is used for the shelf depreciation interference that the filtering resonance reactor produces, and it forms the L-C filter circuit by inductance and electric capacity.Detect impedance by low pressure, measure partial discharge quantity from tested electrical verification cable 4, and the high tension voltage that applies on the test cable 4, put tester for office simultaneously peak mark signal is provided.The capacitor of high pressure notch filter 17 can be used as the baseload in whole test loop, is convenient to carry out the test of zero load or stub cable.Its output is connected to the recirculated water test terminal 18 of testing ground by power cable.
The frequency range that high pressure notch filter 17 has: 15kHz～1MHz, the typical case inserts loss (50 Ω/50 Ω): 〉=60dB, and impedance is 50 Ω, and specific design is as follows:
1) filter parameter: circuit impedance Zo is 50 Ω; The stopband cutoff frequency is 3GHz; Stopband attenuation amount Ax is 20dB.
2) computing element progression is got N=3
3) calculate low-pass prototype filtering circuit normalization component value
4) the prototype filtering circuit is as designed practical filter to select " and C string L type ", and as shown in Figure 7, actual capacitance value and the inductance value of calculating this wave filter get 4000pF and 250mH,
High pressure notch filter 17 design circuits as shown in Figure 7, the die-away curve of this circuit is as shown in Figure 8.
Recirculated water test terminal 18 is a kind of interfaces that high pressure are connected to test cable 4, and its centre has deionized water circulating, and in its process of the test, comes uniform electric field to distribute by deionized water.Its output is connected to the test cable 4 of testing ground.
Part of detecting 2 comprises coupling capacitance 21, detecting unit 22, dividing potential drop electric capacity 23, PD meter 24 and oscillograph 25; The two ends of coupling capacitance 21 are connected to test cable 4 and detecting unit 22 with measurement signal line respectively, and the other end of detecting unit 22 is connected to PD meter 24 and oscillograph 25 respectively with measurement signal line; PD meter 24 all is connected with control section 3 by power cable with oscillograph 25;
Dividing potential drop electric capacity 23 is measured the high pressure output of resonance reactor, for system provides the breakdown protection signal.High-tension measurement signal and breakdown signal are connected to control section 3 with control signal wire respectively.
The whole control part 3 all places in the electric operation control desk; be used for all control function of the system that finishes, comprise voltage self-zeroing circuit, zero start circuit, zero booster circuit, circuit tuning circuit, current foldback circuit, ARC breakdown protection circuit, overvoltage crowbar and place Displaying Meters such as gap % table, COS Φ table, EVM table.Control section 3 is connected with pressure regulator 14, the high voltage reactor 16 of high-potting part 1 by umbilical cable, controls the lifting of pressure regulator 14, the gap adjustment of high voltage reactor 16 etc.; Coupling capacitance 21 by measurement signal line and part of detecting 2, detecting unit 22, dividing potential drop electric capacity 23 etc. are connected, and realize functions such as voltage measurement, breakdown protection, and it is connected with oscillograph 25 with PD meter 24 by power cable simultaneously, for they provide power supply.
As shown in Figure 3, a kind of high voltage non-local discharge test power supply that is used for crosslinked cable, form by high-potting part 1, part of detecting 2, control section 3 three parts, in the high-potting part 1, the screw rod material of precise ball screw selects for use carbon content at the high-carbon alloy steel more than 0.45% in the high voltage reactor 16; And make surperficial induction heat treatment; It is the SCM415H low-carbon alloy steel that the nut material of precision ball screw is selected the trade mark for use, and the hardening heat of making carburizing and quenching is handled: also can select the SCM420H or the SNCM220 trade mark for use, the alloy steel of SCM415H, SCM420H and the SNCM220 trade mark, each component concentration scope is: C content 0.12%～0.24%, and si content 0.17%～0.40% contains Mn amount 0.40%～0.90%, contain Cr amount 0.40%～1.10%, contain Mo amount 0.15%～0.55%, P content≤0.04% contains S amount≤0.04%.
The sleeve pipe office of selecting for use of high voltage reactor 16 is high-volume less than the condenser type bushing of 2pC, the condenser type bushing comprises capacitor core, insulator, conservator and ground connection flange, and be assembled into integral body with brute spring and packing washer, the condenser type bushing adopts the condenser type all-sealed structure, the major insulation capacitor core turns to the concentric column capacitor with cable paper and punching aluminium foil, and do vacuum drying treatment and the processing of vacuum pressure immersion oil, flood condenser oil.
The top of high voltage reactor 16 is connected to dehydrating breather, dehydrating breather is a columnar container, the lower end divide two by union-screw coupling in fuel tank, side has transparent apertures to communicate with atmosphere, dehydrating breather air in place is provided with oil-sealing arrangement, fill drying agent at internal tank, drying agent is selected silica gel or lime chloride for use.
In the high-potting part 1, high pressure notch filter 17 is one three grades and C string L type low-pass filter.
Other are all identical with embodiment 1.
The leading indicator of present embodiment:
Specified input: 100kVA, 380V, 263A, 50Hz;
Specified output: I---2500kVA, 200kV, 12.5A; II---2000kVA, 100kV, 20A; III---800kVA, 40kV, 20A;
Pink noise :≤75dB (leaving 2 meters of equipment measures);
Quality factor: Q 〉=40;
Voltage measurement error :≤± 3%;
The unloaded background interference of equipment: under the no-voltage, PD≤0.05pC; During 45kV, PD≤0.06pC; During 96kV, PD≤0.06pC; During 161kV, PD≤1.2pC;
Load-bearing capacity: operation cooling in 1 hour is 1 hour under the rated capacity, 8 circulation/skies.
YKTY-2500kVA/200kV high pressure resonance reactor in the present embodiment has adopted the precision lead screw of particular design, makes tuning accurate more, stable; Employing office is high-volume less than the bushing of 2pC, makes the office of total system put index and effectively improves; The high pressure resonance reactor is equipped with dehydrating breather, has good moisture-proof role, make the office of reactor discharge water flat can be steady in a long-term.
HVF-hv filtering device 200kV/20A in the present embodiment adopts three grades of filtering, and effectively filtering interference signals reduces the system background noise, has improved the system testing precision.
Claims (5)
1. high voltage non-local discharge test power supply that is used for crosslinked cable, be made up of high-potting part (1), part of detecting (2), control section (3) three parts, described high-potting part (1) comprises the independently-powered unit of 10kV/380V (11), double shield electrostatic isolation transformer (12), low pressure notch filter (13), pressure regulator (14), exciting transformer (15), high voltage reactor (16), high pressure notch filter (17) and recirculated water test terminal (18); The independently-powered unit of 10kV/380V (11) is made up of power transformer and supporting switch cubicle, and its current output terminal connects double shield electrostatic isolation transformer (12) by power cable; The primary coil and the secondary coil of double shield electrostatic isolation transformer (12) all have the electrostatic screening layer, and its current output terminal is connected to low pressure notch filter (13) by power cable; Low pressure notch filter (13) adopts the passive network of " Л " structure, comprises series inductance and shunt capacitance, and its current output terminal is connected to pressure regulator (14) by power cable; Pressure regulator (14) adopts electronic regulating and controlling, and extreme position is equipped with limit switch, and its current output terminal is connected to high voltage reactor (16) by power cable; The current output terminal of high voltage reactor (16) is connected to high pressure notch filter (17) by power cable; High pressure notch filter (17) is formed the L-C filter circuit by inductance and electric capacity, it has 1 current output terminal and 3 signal output parts, its current output terminal is connected to the recirculated water test terminal (18) of testing ground by power cable, have 2 to be connected to the PD meter (24) of part of detecting (2) with measurement signal line in its 3 signal output parts, another signal output part is connected to the oscillograph (25) of part of detecting (2) with measurement signal line; High voltage reactor (16) and high pressure notch filter (17) all are connected to the dividing potential drop electric capacity (23) of part of detecting (2) by common power cable; Recirculated water test terminal (18) inside has deionized water circulating, and its current output terminal is connected to test cable (4) by power cable;
Described part of detecting (2) comprises coupling capacitance (21), detecting unit (22), dividing potential drop electric capacity (23), PD meter (24) and oscillograph (25); The two ends of coupling capacitance (21) are connected to test cable (4) and detecting unit (22) with measurement signal line respectively, and the other end of detecting unit (22) is connected to PD meter (24) and oscillograph (25) respectively with measurement signal line; PD meter (24) all is connected with control section (3) by power cable with oscillograph (25);
Described control section (3) comprises voltage self-zeroing circuit, zero start circuit, zero booster circuit, circuit tuning circuit, current foldback circuit, ARC breakdown protection circuit, overvoltage crowbar and gap % table, COSj table, EVM table; Control section (3) is connected by pressure regulator (14), the high voltage reactor (16) of umbilical cable with high-potting part (1), be connected with coupling capacitance (21), detecting unit (22) and the dividing potential drop electric capacity (23) of part of detecting (2) by measurement signal line, be connected with oscillograph (25) with the PD meter (24) of part of detecting (2) by power cable.
2. the high voltage non-local discharge test power supply that is used for crosslinked cable as claimed in claim 1 is characterized in that: in the high-potting part (1), the screw rod material of precise ball screw selects for use carbon content at the high-carbon alloy steel more than 0.45% in the high voltage reactor (16); And make surperficial induction heat treatment; The nut material of precision ball screw is selected the low-carbon alloy steel of following composition for use, and the hardening heat of making carburizing and quenching is handled: C content 0.12%～0.24%, si content 0.17%～0.40%, contain Mn amount 0.40%～0.90%, contain Cr amount 0.40%～1.10%, contain Mo amount 0.15%～0.55%, P content≤0.04% contains S amount≤0.04%.
3. the high voltage non-local discharge test power supply that is used for crosslinked cable as claimed in claim 1, it is characterized in that: in the high-potting part (1), the sleeve pipe office of selecting for use of high voltage reactor (16) is high-volume less than the condenser type bushing of 2pC, the condenser type bushing comprises capacitor core, insulator, conservator and ground connection flange, and be assembled into integral body with brute spring and packing washer, the condenser type bushing adopts the condenser type all-sealed structure, the major insulation capacitor core turns to the concentric column capacitor with cable paper and punching aluminium foil, and do vacuum drying treatment and the processing of vacuum pressure immersion oil, flood condenser oil.
4. the high voltage non-local discharge test power supply that is used for crosslinked cable as claimed in claim 1, it is characterized in that: in the high-potting part (1), the top of high voltage reactor (16) is connected to dehydrating breather, dehydrating breather is a columnar container, the lower end divide two by union-screw coupling in fuel tank, side has transparent apertures to communicate with atmosphere, dehydrating breather air in place is provided with oil-sealing arrangement, fill drying agent at internal tank, drying agent is selected silica gel or lime chloride for use.
5. the high voltage non-local discharge test power supply that is used for crosslinked cable as claimed in claim 1 is characterized in that: in the high-potting part (1), high pressure notch filter (17) is one three grades and C string L type low-pass filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100422126A CN101329382A (en) | 2007-06-19 | 2007-06-19 | High voltage non-local discharge test power supply for crosslinked cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100422126A CN101329382A (en) | 2007-06-19 | 2007-06-19 | High voltage non-local discharge test power supply for crosslinked cable |
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| CN101329382A true CN101329382A (en) | 2008-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100422126A Pending CN101329382A (en) | 2007-06-19 | 2007-06-19 | High voltage non-local discharge test power supply for crosslinked cable |
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Open date: 20081224 |