CN201259525Y - Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance - Google Patents
Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance Download PDFInfo
- Publication number
- CN201259525Y CN201259525Y CNU2008201638664U CN200820163866U CN201259525Y CN 201259525 Y CN201259525 Y CN 201259525Y CN U2008201638664 U CNU2008201638664 U CN U2008201638664U CN 200820163866 U CN200820163866 U CN 200820163866U CN 201259525 Y CN201259525 Y CN 201259525Y
- Authority
- CN
- China
- Prior art keywords
- xlpe
- frequency
- voltage
- power supply
- cable material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to a test device used for testing cross-linked polyethylene performance, which aims to reliably determine and compare the water treeing resistant performance in different XLPE material formulas, and have simple and convenient testing operations, and sample with simple structure and small volume. The technical proposal includes that the test device used for testing the water treeing resistance of cross-linked polyethylene cable material comprises a water tree test sampler, a high frequency adjustable high-voltage power supply and a protection timing circuit; the sampler is a XLPE board with a group of water pinholes machined on the base board thereof; the XLPE board is made of detected cable material; wherein, the water pinholes are formed during the board fabrication process; a segment of polyethylene short tube is adhered on the XLPE board to form a container for being injected with salt solution; the output of the high frequency adjustable high-voltage power supply is respectively connected with an electrode on the bottom of the sampler and an electrode on the upper part inside the salt solution.
Description
Technical field
The utility model relates to a kind of test unit of testing the crosslinked polyethylene performance, especially compares and evaluate the test unit of crosslinking polyethylene-insulated cable material water treeing resistance performance.
Background technology
Cable insulation " water treeization " thus be to cause the aging major reason that reduces serviceable life that punctures of twisted polyethylene cable.The urgency that enlarges day by day with the urban power consumption along with China's industrial scale increases, and the consumption of 10kV crosslinked polyethylene (XLPE) cable is increasing, and it is more and more that the water tree causes the accident that cable insulation punctures.The customary way that compares, evaluates the XLPE cable material water treeing resistance performance is to adopt power-frequency voltage, but cultivates the chronic of water tree, can not adapt to the needs of quick research.Unite States Standard (USS) (ASTM D 6097-97a) has proposed the method with the making of the method sample of the making of method of high frequency 1kHz sine voltage acceleration cultivation water tree and sample.But ASTM D 6097-97a proposes the method complexity of the making of sample, and volume of sample is huge; In addition, the present domestic product that does not still have 1kHz, 10kV high-frequency and high-voltage power supply.
The utility model content
The test unit that the purpose of this utility model is to provide a kind of comparison, evaluates the water treeing resistance performance of cross-linked poly-ethylene cable material, the water treeing resistance performance of different formulations XLPE material should be able to be measured, be compared to this device reliably, and test operation is simple and convenient, sample structure is simple, and volume of sample is little.
The technical scheme that the utility model proposes is: the test unit of crosslinking polyethylene-insulated cable material water treeing resistance performance comprises the sample and the tunable high-frequency high-voltage power supply of water tree test usefulness and protects timing circuit; The base plate of described sample is the XLPE plate that is shaped on one group of liquid drugs injection hole, and this XLPE plate is made with the cable under test material, and liquid drugs injection hole wherein forms when making sheet, and bonding one section tygon short tube forms container on the XLPE plate, so that inject salt solusion therein; The output of described tunable high-frequency high-voltage power supply links to each other with electrode in the salt solusion of top with the sample bottom electrode respectively.
10 liquid drugs injection holes are arranged on the described XLPE plate, adopt silica gel bonding between XLPE plate and the tygon short tube.
Described tunable high-frequency high-voltage power supply adopts two igbt transistors and two capacitors, form the semibridge system on-off circuit, form the hybrid resonant frequency changer circuit with inductance and electric capacity again, resonance potential is boosted through high-frequency and high-voltage generator and is high-frequency and high-voltage, so that the water tree causes and the power supply of growth as quickening.
Described high-frequency and high-voltage is 1kHz, 0-10kV.
The test unit that the utility model provides, sample structure is simple, and volume of sample is little, and production process is also simple.Adopt the method that improves electric voltage frequency, can help applying with causing the water tree in the short time under lower voltage at cable industry; In addition, this device also can be measured the life-span that the water tree causes sample to puncture.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the schematic diagram of the adjustable direct supply in the utility model.
Fig. 3 is the driving circuit schematic diagram of the adjustable direct supply in the utility model.
Fig. 4 is the schematic diagram of the high-frequency and high-voltage generator in the utility model.
Fig. 5 is the protection in the utility model and the schematic diagram of timing circuit.
Fig. 6 is the assembling synoptic diagram of compacting sample mould.
Embodiment
The test unit of crosslinked polyethylene of the present utility model (XLPE) insulated cable material water treeing resistance performance mainly comprises sample 10 and hookup, and hookup comprises driving circuit 30, high-frequency and high-voltage generator 20, holding circuit 60 (being the sample breakdown protection circuit) and timing circuit 50 5 parts of adjustable direct supply 40, adjustable direct supply again.
In general the tree of the water in the cable insulation is grown in internal fields such as impurity and micropore and concentrates the place, and therefore adopting needle point curvature is micron-sized liquid drugs injection electrode, and the infiltration of moisture content is concentrated and quickened to simulate electric field.XLPE material is placed in the mould with hard metal needle, after hot pressing, cooling, on specimen surface, forms pin hole.The mould that ASTM D6097-97a standard proposes is once pressed four test blocks, there is a pin hole in each test block surface central authorities, then a plurality of test blocks are embedded in the bottom of organic glass container, under vacuum condition, in the organic glass container, inject the salt solusion of regulation, so that solution is full of needle point, salt solusion is as top electrode.
The Mold Making that ASTM D 6097-97a standard proposes is relatively multiple more assorted, and the sealing between the organic glass frame XLPE test block is close to cooperation, the requirement on machining accuracy height, and volume of sample is bigger.In order to simplify the method for making of sample, the utility model proposes the mould of making 10 liquid drugs injection holes on the XLPE plate that once is compressed on diameter 55mm, on the XLPE plate of the band pin hole of suppressing, with the polyethylene pipe of bonding joint high 40mm, external diameter 50mm of silica gel and internal diameter 40mm, as the container that holds salt solusion.With the utility model proposes the Mold Making sample, sample structure is simple, and volume of sample is little, and operation is simple.
Fig. 6 has shown the mould of compacting XLPE sample 10-1, and mould is made up of 5 parts, and the steel disc 1 and 4 of diameter 100mm, thickness 5mm is arranged among the figure; The steel annulus 2 of external diameter 100mm, internal diameter 55mm, thickness 6.4mm; 10 diameters 2
-The steel disc 3 of mm through hole, disk diameter 100mm, thickness 6.4mm; The white draw point 5 of 10 diameter 2mm, needle point radius-of-curvature 5 μ m; Pin inserts in the hole of disk 3, and pin and hole are wringing fits, disk 3 and the disk 4 usefulness countersink head screws cover plate that is called mould fixed with each other, and remainder is called the bottom of mould.The steel deck-plate of band pin is separated from mould, the bottom of mould and the back of steel deck-plate are placed on preheating on 120 ℃ of hot presses of temperature, XLPE grain for preparing and powder are mixing in the Banbury mixer of 110 ℃ of temperature, the mixing materials that weighs up constant weight is put into cavity 6 preheatings 20 minutes of mould, cover cover plate, pin inserts in the batching of fusion, is pressurized to 10MPa, improve hot pressing temperature to 160 ℃, continue 15 minutes; Die material is moved on the chilling press, and cool to room temperature under pressurized state is opened mould, takes out the XLPE plate of band pin hole, is stained with the polyethylene pipe of joint high 40mm, external diameter 50mm and internal diameter 40mm in porose one side with silica gel, as the container that holds salt solusion.
Initiation and the growth of quickening the water tree have two kinds of methods, 1. improve voltage, 2. improve electric voltage frequency.Under power-frequency voltage, in order to quicken in the sample to cause the water tree, applied voltage up to 15kV or more than, in this situation, the liquid drugs injection tip tends to cause the electricity tree, rather than pure water tree, reduces voltage and must prolong test period.Improving electric voltage frequency and can cause the water tree in the time of weak point under lower voltage, is recommendable method.
The utility model adopts two igbt transistors and two capacitors, form the semibridge system on-off circuit, form the hybrid resonant frequency changer circuit with inductance and electric capacity again, resonance potential is after high-frequency and high-voltage generator boosts, obtain 1kHz, 10kV high-frequency and high-voltage, high-voltage value is adjustable continuously in the 0-10kV scope, and the water tree causes and the power supply of growth as quickening.
In general; cultivate the water tree and do not wish that sample punctures; but sample may puncture in the process of the test under individual cases; when sample punctures, damage, in time write down the test accumulated time, be equipped with holding circuit (being power protecting circuit) and timing circuit in the test unit of the present utility model for fear of power supply.
Fig. 2 is adjustable direct supply, voltage-regulation scope 0-300V, it provides the electric energy of high-frequency and high-voltage generator, this circuit comprises: D1, D2, D3, the industrial frequency rectifying circuit that four commutator tubes of D4 (bridge-type) and filter capacitor C0 form, capacitor C1, C2 and IGBT pipe QM1, QM2 (model is CM100DY-24H) forms the half-bridge switch circuit, hand switch S1, S2, contactor ZK, contact K1, K2, K3 and " closing ", " branch " button is formed the closure of power frequency supply, divide open circuit, J3 ' joins and forms no-voltage combined floodgate circuit among J3 and Fig. 3, promptly have only when UD1 among Fig. 3 does not have trigger pulse output, the pin 1 of J3 and 2 could short circuit.High-frequency transformer T1
Elementary two ends are connected on the line of capacitor C1, C2 respectively and on the line of QM1, QM2, the alternate conduction of switching tube QM1, QM2 is in the secondary induction HF voltage of high-frequency transformer T1, after high-frequency diode D7, D8 form full-wave rectification, carry out filtering by inductance L and C3.In addition, pilot lamp L1, L2 do to show and use.
The driving circuit of adjustable direct supply (Fig. 3) is made up of the integrated electric controller UD1 of Switching Power Supply (T494), triode (Q21, Q31), two optocouplers (P1, P2), two driving combinational circuits (EXB841) and bias voltage, protective circuit of voltage regulation.J5 links to each other with two groups+20V direct supply respectively with J6 among Fig. 3, J1 ' and J2 ' respectively with Fig. 2 in J1 link to each other with J2.
The integrated electric controller UD1 of Switching Power Supply alternately produces the fixing square-wave voltage of two groups of dutycycles; respectively by pin 9 and 10 outputs; after Sheffer stroke gate, phase inverter and amplifier amplify; input drives composite module EXB841; the square wave of EXB841 output is by protective resistance R30 and R32, and the pin 2 with plug J1 ' and J2 ' links to each other respectively.The square wave of EXB841 output is by conducting and the disconnection of IGBT pipe QM1 in the J1 control chart 2 among J1 ' among Fig. 3 and Fig. 2.In like manner, conducting and the disconnection of the square wave control IGBT pipe QM2 of EXB841 output.Bias voltage is made up of resistance R 31, capacitor C 21 and stabilivolt D34 series parallel circuits.Holding circuit is composed in series by stabilivolt DO3 and DO4 reversal connection.When the tube voltage drop that records switching tube QM1 (see figure 2) when circuit between module EXB841 pin 9 and 6 surpasses 7V, optocoupler P2 conducting, diode D24 conducting, the pin 15 of the integrated electric controller UD1 of Switching Power Supply becomes electronegative potential by noble potential, and the UD1 failure of oscillation reaches protective effect.Regulator potentiometer R changes UD1 pin 4 current potentials, changes square width, regulates DC voltage.
Trial voltage must be elevated to setting with certain speed from zero during test, and in order to prevent when connecting power frequency supply, generator can output HIGH voltage, has increased J3 no-voltage combined floodgate circuit among the figure; The voltage of the integrated electric controller UD1 of Switching Power Supply pin 10 outputs is received comparer U2, if potentiometer R is not at noble potential, when just UD1 has square-wave voltage output, U2 has exported noble potential, after amplifier U3, U4 and triode Q6 amplification, do Low ESR output by emitter follower Q5, make relay R ELAY action, contact K7 has separately disconnected the control loop that power frequency supply closes a floodgate; On the contrary, if potentiometer R at noble potential, the K7 closure is connected the combined floodgate circuit at J3 place among Fig. 2 through J3 ', regulator potentiometer R, trial voltage (1kHz sine wave) increase of starting from scratch.
Fig. 4 is 1kHz, the circuit diagram of 10kV sine-wave generator (high-frequency and high-voltage generator), the integrated electric controller UD1 of Switching Power Supply produces the 1kHz fixed frequency among the figure, the square-wave voltage of dutycycle 45%, when the square wave of UD1 pin 10 outputs is noble potential, through Q1, the Q2 two-stage is amplified makes among the optocoupler P1 that electric current is zero in the light emitting diode after (and paraphase), resistance R 15 left ends are in noble potential, NPN triode Q3 conducting, PNP triode Q4 ends, on the contrary, when UD1 pin 10 output square waves were electronegative potential, NPN triode Q3 ended, PNP triode Q4 conducting, therefore, the square wave of Q3-Q4 series connection triode output is identical with the square wave phase of UD1 pin 10 outputs.The square wave of Q3-Q4 series connection triode output drives IGBT pipe Q7 by resistance R 24; In like manner, the square wave of Q5-Q6 series connection triode output drives IGBT pipe Q8 by resistance R 25.DO1 and DO2 are respectively 10V and 5V stabilivolt, both anti-phase series connection, the gate-voltage limit of Q7 within the limits prescribed.
Q7, Q8 and capacitor C 4, C5 form the half-bridge switch circuit, and the A ' of bridge and B ' point link to each other with the B point with A among Fig. 2; As Q7, Q8 alternate conduction, when cut-offfing, P, D point-to-point transmission obtain the positive and negative square wave output that replaces in the bridge.In order to obtain sine voltage, used the hybrid resonant circuit among Fig. 4, capacitor C is in parallel with load transformer T, and capacitor C 4 (C4=C5) is formed series resonance again with inductance L.At the voltage waveform that high-frequency transformer T hot side records, can record output voltage waveforms with 1: 1000 Tyke probe and oscillograph for sinusoidal wave.
Holding circuit and timing circuit are shown among Fig. 5; Holding circuit is made up of amplifier, boostrap circuit, phase inverter, univibrator.Fig. 4 socket J8 ', J7 ' are linked to each other with Fig. 5 plug J8, J7 respectively; When sample takes place to puncture, obtain a small short-circuit signal among Fig. 4 on the R19, after this short-circuit signal triode OP37 in Fig. 5 amplifies, occur in the positive half-wave or the negative half-wave of voltage sine wave according to puncture, just according to the positive or negative polarity of short-circuit signal, respectively from positive polarity boostrap circuit (LM311 above Fig. 5) or negative polarity boostrap circuit (LM311 below among Fig. 5), no matter signal is walked that road boostrap circuit, all obtain a positive polarity burning voltage, through becoming reverse voltage behind the phase inverter 4011-1, reverse voltage triggers univibrator (forming by two 4011) upset, univibrator pin 4 becomes electronegative potential by noble potential, and the pin 2 of plug J7 also becomes electronegative potential by noble potential; Because the pin 15 of UD1 becomes electronegative potential suddenly among Fig. 4, the UD1 failure of oscillation, high-frequency and high-voltage generator is output voltage no longer, has avoided the sample short circuit to cause the damage of generator.
Timing circuit is made up of amplifier, contactor and electronic clock Z among Fig. 5.Plug-in unit J9 links to each other with J9 ', and plug J9 ' pin 1 and 2 joins, and electronic clock stops clocking; Pin 3 and 2 joins, and electronic clock begins to clock; During the high-frequency and high-voltage generator operate as normal, monostable multi resonant device 4011 pin of Fig. 54 output noble potentials, triode Q52 base stage is positioned at noble potential, contactor Z8 action, contact K4 opens, the K5 closure, electronic clock picks up counting, on the contrary, and when sample punctures, as previously mentioned, monostable multi resonant device 4011 pin 4 become electronegative potential, and triode Q52 base stage is positioned at electronegative potential, no current in the contactor Z8 coil of wire, contact K4 closure, K5 opens, electronic clock stops timing, presses reset button K7, removes the time read of record.
Claims (4)
1, the test unit of crosslinking polyethylene-insulated cable material water treeing resistance performance is characterized in that this device comprises sample (10) and the tunable high-frequency high-voltage power supply and the protection timing circuit of water tree test usefulness; The base plate of described sample is the XLPE plate that is shaped on one group of liquid drugs injection hole, and this XLPE plate is made with the cable under test material, and liquid drugs injection hole wherein forms when making sheet, and bonding one section tygon short tube forms container on the XLPE plate, so that inject salt solusion therein; The output of described tunable high-frequency high-voltage power supply links to each other with electrode in the salt solusion of top with the sample bottom electrode respectively.
2, the test unit of crosslinking polyethylene-insulated cable material water treeing resistance performance according to claim 1 is characterized in that 10 liquid drugs injection holes are arranged on the described XLPE plate, adopts silica gel bonding between XLPE plate and the tygon short tube.
3, the test unit of crosslinking polyethylene-insulated cable material water treeing resistance performance according to claim 1 and 2, it is characterized in that described tunable high-frequency high-voltage power supply adopts two igbt transistors and two capacitors, form the semibridge system on-off circuit, form the hybrid resonant frequency changer circuit with inductance and electric capacity again, resonance potential is boosted through high-frequency and high-voltage generator and is high-frequency and high-voltage, so that the water tree causes and the power supply of growth as quickening.
4, the test unit of crosslinking polyethylene-insulated cable material water treeing resistance performance according to claim 3 is characterized in that described high-frequency and high-voltage is 1kHz, 0-10kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201638664U CN201259525Y (en) | 2008-09-02 | 2008-09-02 | Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201638664U CN201259525Y (en) | 2008-09-02 | 2008-09-02 | Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201259525Y true CN201259525Y (en) | 2009-06-17 |
Family
ID=40773763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201638664U Expired - Lifetime CN201259525Y (en) | 2008-09-02 | 2008-09-02 | Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201259525Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778638A (en) * | 2012-09-11 | 2012-11-14 | 中国电力科学研究院 | Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree |
| WO2013159284A1 (en) * | 2012-04-24 | 2013-10-31 | 天津市电力公司 | Aging test device of xlpe medium voltage cable water tree |
| CN108761298A (en) * | 2018-09-05 | 2018-11-06 | 国网河北省电力有限公司电力科学研究院 | Distribution cable Insulation monitoring test method |
| CN109557431A (en) * | 2018-11-19 | 2019-04-02 | 国网北京市电力公司 | A kind of immersion measurement method based on XLPE cable insulation tabletting sample |
| CN110068754A (en) * | 2018-01-24 | 2019-07-30 | 上海交通大学 | Sample mould suitable for polymer heavy insulation slab construction electrical breakdown test |
-
2008
- 2008-09-02 CN CNU2008201638664U patent/CN201259525Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013159284A1 (en) * | 2012-04-24 | 2013-10-31 | 天津市电力公司 | Aging test device of xlpe medium voltage cable water tree |
| CN102778638A (en) * | 2012-09-11 | 2012-11-14 | 中国电力科学研究院 | Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree |
| CN102778638B (en) * | 2012-09-11 | 2014-06-25 | 中国电力科学研究院 | Method for judging aging state of cross linked polyethylene (XLPE) cable insulation water tree |
| CN110068754A (en) * | 2018-01-24 | 2019-07-30 | 上海交通大学 | Sample mould suitable for polymer heavy insulation slab construction electrical breakdown test |
| CN110068754B (en) * | 2018-01-24 | 2021-01-08 | 上海交通大学 | Sample mould suitable for polymer thick insulation flat structure electrical breakdown test is used |
| CN108761298A (en) * | 2018-09-05 | 2018-11-06 | 国网河北省电力有限公司电力科学研究院 | Distribution cable Insulation monitoring test method |
| CN109557431A (en) * | 2018-11-19 | 2019-04-02 | 国网北京市电力公司 | A kind of immersion measurement method based on XLPE cable insulation tabletting sample |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101354425B (en) | Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance | |
| CN201259525Y (en) | Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance | |
| CN209182444U (en) | A kind of universal compression joint type IGBT power modules testboard | |
| CN201773164U (en) | Short circuit testing device for pole group of polymer flexible packaging lithium ion battery | |
| CN107329060A (en) | A kind of test fixture detected for LED light bar voltage-withstand test with outward appearance | |
| CN204901643U (en) | Energy -conserving road lighting system of piezoelectric type | |
| CN2793738Y (en) | Transistor measuring equipment | |
| CN2219498Y (en) | Portable high-voltage AC electroscope | |
| CN105513293B (en) | A kind of passive temperature difference warning system | |
| CN201020597Y (en) | Inverter welding power source | |
| CN201478999U (en) | IGBT driving circuit of frequency converter with middle and higher voltage | |
| CN205008267U (en) | Concora crush test machine | |
| CN207069914U (en) | Ultrasonic wave High Power IGBT Driver Circuit | |
| CN208077939U (en) | A kind of pressure-resistant automatic testing equipment of solar double-glass assemblies insulation | |
| CN206311704U (en) | A kind of adjustable high-voltage pulse type battery pole plates insulating properties detection system | |
| CN208797823U (en) | Bridge driving circuit on inverter | |
| CN203587632U (en) | Switch device and cable identification device | |
| CN206945923U (en) | A kind of lithium battery electric core short-circuit detecting device | |
| CN205809151U (en) | A kind of cylindrical lithium battery voltage test device | |
| CN215833208U (en) | Waterproof performance device is tested fast to on-vehicle dull and stereotyped | |
| CN201385175Y (en) | Novel high-power inverse arc welding power supply | |
| CN201243074Y (en) | Repairing instrument for lead-acid accumulator | |
| CN104779939B (en) | A kind of delay matching circuit and method for IGBT series average-voltages | |
| CN209327386U (en) | Pneumatic fixture controls platelet | |
| CN204928096U (en) | On -vehicle dc -to -ac converter of intelligence |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090617 Effective date of abandoning: 20080902 |