CN102735977A - Electrical-thermal aging device of cable accessories under high voltage and high current and test method thereof - Google Patents
Electrical-thermal aging device of cable accessories under high voltage and high current and test method thereof Download PDFInfo
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- CN102735977A CN102735977A CN2012102410891A CN201210241089A CN102735977A CN 102735977 A CN102735977 A CN 102735977A CN 2012102410891 A CN2012102410891 A CN 2012102410891A CN 201210241089 A CN201210241089 A CN 201210241089A CN 102735977 A CN102735977 A CN 102735977A
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Abstract
The invention discloses an electrical-thermal aging test device of cable accessories under high voltage and high current. The electrical-thermal aging test device is characterized by comprising the following four functional parts: a high-voltage generation unit (1), a test loop unit (2), a high-current generation unit (3) and a signal measurement unit (4). The high-voltage generation unit (1) is connected with the test loop unit (2) so as to introduce the high voltage to a test loop; the test loop unit (2) passes through the high-current generation unit (3) to form a magnetic field couple and generate the high current, and when the aging test is performed, the high-voltage generation unit and the high-current generation unit work at the same time to realize the purpose of applying the high voltage and the high current in the test loop unit; and the signal measurement unit (4) is installed in the test loop unit (2), so that the isolation aging state detection of the cable accessories can be realized through collecting the electrical characteristic parameters which are used for detecting the partial discharge of the sample cable accessories.
Description
Technical field
The present invention relates to the thermal-electrical aging device and the test method thereof of cable accessory under a kind of high-voltage great-current, belong to the operation maintenance technical field of power cable.
Background technology
In recent years, along with the large-scale redevelopment of China's urban distribution network, go into the ground cable and progressively substitute transmission line of electricity and the distribution network that overhead transmission line makes up the city, each metropolitan cable uses proportion to improve rapidly, and the use of cable accessory is very extensive.Power cable generally is made up of cable body and cable accessory two parts; In the long-time running process, receive thermal-electrical aging effect power cable and annex thereof that insulation degradation takes place gradually, physicochemical property descends; Finally cause failure of insulation, serious threat is to the operational reliability of electric system.Particularly cable accessory because of the complicacy of this body structure, making and mounting process and service condition, is the fault exemplary position of cable system in actual motion.Usually the main cause of quickening the cable accessory insulation ag(e)ing is: the electricity that high voltage, highfield cause is aging; The heat ageing that the conductor resistance loss brings; Mechanical stress damage in the production assembling process; Environmental baseline stress is like UV radiation and moisture corrosion etc.Wherein, long term is to cause cable accessory that the main cause of insulation ag(e)ing takes place in real work in electric stress, thermal stress and the synergy thereof of cable.Therefore; The thermal-electrical aging device that needs a kind of cable accessory; Electricity, the thermal stress of being born when effectively the dummycable annex moves; And can the test product cable accessory under different temperatures, voltage type, the electric pressure be made an experiment, and obtain cable status parameter and the local discharge signal data in the test product ageing process, and then the insulation ag(e)ing process of research cable accessory.
In view of the restriction of testing transformer capacity, aging equipment is when introducing high pressure through testing transformer, and inside is difficult to through enough big electric current with load condition that is virtually reality like reality.For this reason, both at home and abroad the common design thinking of aging equipment all is difficult to realize to the collaborative acceleration of wearing out of the electric heating of high voltage electric equipment insulating material for quicken aging to insulating material, electrical equipment through means such as illumination, light current, outer heat.Chinese patent CNIO1285867A " electrical insulation electric heating ageing testing equipment " discloses a kind of thermal-electrical aging scheme; In the temperature control box that electric insulation equipment with pressure places and the external world is heat insulation, realize heat ageing to apparatus insulated material through the temperature in the control chamber.This program simulation the insulation of electrical installation material receive the actual condition under High Voltage electric field, the common aging action of heating effect of current; But it belongs to the thermal-electrical aging of external-heat, not the agine mechaism of insulating material under this angle research electric heating acting in conjunction of thermal effect when electric current is flow through in high-tension apparatus inside.
Summary of the invention
The objective of the invention is to provide the thermal-electrical aging device and the test method thereof of cable accessory under a kind of high-voltage great-current to existing technological deficiency; Be characterized in the electric heating ageing testing that adopts apparatus of the present invention and test method thereof that cable accessory is insulated; The test specimen cable accessory is applied high pressure, the residing High Voltage electric field environment of cable accessory under the simulation actual condition; In the cable conductor core, pass through big electric current simultaneously, the working environment of simulation cable accessory when the banded cable load operation.The two mutually combines, comparatively truly the electric field, the thermal field stress that when actual motion, are born of dummycable annex.In ageing process,, realize insulation ag(e)ing state-detection to cable accessory through the electrical specification parameters such as shelf depreciation in acquisition testing sample cable and the annex thereof.
The object of the invention is realized by following technical scheme:
The electrical-heating aging test device of cable accessory comprises high-voltage generating unit under the high-voltage great-current, unit, test loop, big electric current generating unit and four funtion parts of signal measurement unit; High-voltage generating unit is connected with the unit, test loop, and high pressure is introduced in the test loop; The unit, test loop passes big electric current generating unit, forms the magnetic field coupling, produces big electric current, and during senile experiment, high-voltage generating unit is worked with big electric current generating unit simultaneously, is implemented in the purpose that applies high voltage in the unit, test loop and pass to big electric current.Signal measurement unit is installed in the test loop, through the electrical specification parameters such as shelf depreciation in the acquisition testing sample cable accessory, realizes the insulation ag(e)ing state-detection to cable accessory.
Said high-voltage generating unit comprises does not have dizzy HT testing transformer, import pressure regulator one, protective resistance and high pressure does not for connection have dizzy lead, does not have dizzy indication equipment here and under high pressure can not produce corona discharge.Do not have dizzy HT testing transformer and play the high pressure generation, its input end is connected with input pressure regulator one, through importing voltage type and the size that pressure regulator one changes the transformer input end, correspondingly controls the high-pressure side output voltage.The testing transformer high-pressure side is connected with protective resistance, and protective resistance is carried out overcurrent protection with the output current of limit assay transformer to transformer, and protective resistance is connected with the dizzy lead of nothing, does not have dizzy lead the high pressure that testing transformer produces is incorporated into the test loop;
Unit, said test loop is four sections " mouth " font metal loops that the power cable series connection forms; Comprise cable accessory test sample one and test sample two and stube cable one and stube cable two; One end of two groups of cable accessory test samples is processed the cable accessory that there is the artificial defective mounting of typical case inside; Help to study the artificial defective mounting of typical case and under electric heating stress, quicken the process of insulation degradation, the other end of test sample inserts in the cable testing oil terminal, and the test oil terminal inner is full of insulating oil; The use at test oil terminal will be got rid of the sample other end and introduce the discharge interference, make the discharge signal of test specimen more single; Stube cable one and stube cable two couple together the formation current return with test sample one and test sample two, and wherein stube cable two passes the center of current transformer; Form the coupled relation on the magnetic circuit; Owing to pass current transformer, stube cable two is nearest positions of liftoff current potential, pressurization back, whole loop, and its surface evenly puts the multilayer silicone rubber insulation layer; Utilize the principle of the breakdown field strength of solid insulating material, effectively solve the problem of insulation distance greater than the air breakdown field intensity; The interconnective position of cable all adopts high-voltage connection terminal to connect, and is fixed with grading ring on the high-voltage connection terminal, prevents that the loop from the joint, back that adds high pressure corona discharge taking place;
Said big electric current generating unit comprises straight-through current transformer and input pressure regulator thereof.Behind the straight-through current transformer input power-frequency voltage, flow through exchange current in its primary coil, in the test loop, produce big electric current, play current source, the whole test loop is applied electric current through electromagnetic induction principle.The current transformer input terminal voltage is controlled by pressure regulator, changes the size of input voltage, correspondingly changes the size of current that flows through in the winding of the former limit of current transformer, realizes the control to the test loop electric current.The electric current that big electric current generating unit produces in the test loop is measured through clamp on amperemeter.
Said signal measurement unit is that the equipment combination of the aging state of insulation of detection streamer annex comprises temperature infrared imager, Luo-coil, ultra-high frequency antenna, signal processing circuit and digital oscilloscope.Wherein, the temperature infrared imager is monitored the temperature rise situation on cable accessory surface when device carries out aging test, and the surperficial temperature information of cable accessory, heat generating spot parameter etc. are provided.Luo-coil is through the local discharge signal in the EM coupling method detection streamer annex; Ultra-high frequency antenna detects local discharge signal through the ultra-high frequency signal that induction cable annex internal discharge produces.The local discharge signal that Luo-coil, ultra-high frequency antenna collect carries out signal amplification, Filtering Processing through signal processing circuit, inputs to digital oscilloscope and observes.Said signal processing circuit realizes the amplification and the filter function of signal, and its connected mode is: its input end connects the resistance R of control high-frequency cut-off frequency
1With capacitor C
1Carry out high-frequency signal filtering, voltage stabilizing diode D
1, D
2Be parallel to input end as the input overvoltage protection, signal behind High frequency filter with the resistance R of control computing enlargement factor
2With R
3Connect feedback resistance R
3Be parallel to operational amplifier U
1Input end and output terminal between, the resistance R of the signal input control low-frequency cut-off frequency after amplifying
4With capacitor C
2Carry out low frequency signal filtering, capacitor C
3With being connected to output terminal after the DC component filtering in the signal, voltage stabilizing diode D
3, D
4Be parallel to output terminal as output over-voltage protection branch road.
The test method of the electrical-heating aging test device of cable accessory may further comprise the steps under the high-voltage great-current:
1). test is prepared
When cable accessory test sample one is installed with test sample two; The insulation defect that internal production is artificial adds artificial defect and can quicken the insulation ag(e)ing of cable accessory, behind the Processing Test sample; Connect high-voltage generating unit, unit, test loop, big electric current generating unit in the test unit; Signal measurement unit is installed in the test loop, uses telecommunication cable that measuring-signal is drawn, carry out debugging test afterwards; After device is through withstand voltage test; Utilize high-voltage generating unit to be forced into measurement of partial discharge voltage, pretreated cable accessory is carried out Partial Discharge Detection, the shelf depreciation parameter information of cable accessory under the record original state through signal measurement unit.
2). high-voltage great-current is aging
Regulate the output voltage that does not have dizzy HT testing transformer input pressure regulator, make testing transformer export specified aging voltage, change the voltage type and the size of transformer input end, correspondingly control the high-pressure side output voltage to the unit, test loop.Regulate the output voltage of the input pressure regulator two of current transformer, make and flow through specified aging electric current in the unit, test loop.The testing transformer summation current transformer is worked simultaneously, has not only applied over the ground high pressure in the test loop but also through big electric current, has carried out the electric heating ageing testing of cable accessory.When device pressurizes through-flow aging test, regulate the input pressure regulator one of testing transformer, increase the testing transformer output voltage and can simulate in the electric system in short-term superpotential the aging accelerating effect of cable accessory insulation; Regulate current transformer input pressure regulator two, change the load fluctuation in the big I analog electrical power system of electric current in the test loop, the electric current that flows through in the loop is measured through clamp on amperemeter.
3). gather state of insulation information
When device carries out aging test, detect through the state of insulation information of signal measurement unit to cable accessory.Wherein, the serviceability temperature infrared thermoviewer is monitored the surface temperature rise situation of cable accessory when aging test; Use the local discharge signal in Luo-coil, two kinds of Partial Discharge Detection modes of the ultra-high frequency antenna detection streamer annex; The discharge signal that collects inputs to signal processing circuit; Carry out inputing to the digital oscilloscope demonstration after signal amplification, the filtering, its state of insulation is assessed through the local discharge signal waveform of analyzing cable accessory.
The present invention has the following advantages:
1). objective reality property: the present invention has simulated the residing high-voltage large current duty of cable accessory in the true electric system; Cable accessory is carried out electric heating works in coordination with aging; The highfield that its mesohigh produces carries out electricity to cable and wears out, and the Joule heat that big electric current flows through the cable generation carries out heat ageing to cable.The input that changes testing transformer can be carried out the aging test of cable accessory under different voltage types, the electric pressure, regulates the input of current transformer and can simulate the load fluctuation in the electric system.
2). convenience: the present invention makes simply, and material requested is common comparatively common material in the high voltage electric equipment.Install simple to operately, only need the input pressure regulator of control testing transformer summation current transformer to control WV, the electric current of cable accessory.
3). security: device is isolated high-pressure section and control, measure portion, the equal reliable ground of high-pressure section earthing position, control, measurement all can be provided with overvoltage protection.The test unit material is considered heat-resisting problem when selection; Device produces electric current through the EM coupling of current transformer in the loop; Its heating power can with the through-flow 250A of test unit, continue to measure after 12 hours its metal section and part maximum temperature and be no more than 90 ℃ through the input control of current transformer; There is not kindling point in the loop, safe and reliable.Test oil terminal good airproof performance, phenomenons such as no leakage of oil.
4). withstand voltage level is high: device has considered emphatically that when design problem of withstand voltage, testing transformer output terminal, high-voltage connection all use corona free to handle, and the high-voltage connection terminal of band grading ring is all used at interconnective position, test loop.Device corona free in power frequency withstand test produces, and partial discharge quantity is in normal range.
5). accuracy: cable accessory uses multiple comparatively ripe measurement means to measure simultaneously when carrying out the thermal-electrical aging process, and the mutual reference of measurement result has characteristics accurately and reliably.
The thermal-electrical aging device of cable accessory and test method thereof can be widely used in the electric heating insulation ag(e)ing of monitoring power cable and annex thereof under the high-voltage great-current of the present invention; Study the insulation ag(e)ing process of this kind equipment; To propose to solve the measure of power cable fault, ensure the power cable line reliability service.
Description of drawings
Fig. 1 is the electrical-heating aging test device synoptic diagram of cable accessory under the high-voltage great-current
1, high-voltage generating unit, 2, the test loop, 3, big electric current generating unit, 4, signal measurement unit; 5, there is not dizzy HT testing transformer, 6, input pressure regulator one, 7, protective resistance; 8, high pressure does not have dizzy lead, and 9, current transformer, 10, input pressure regulator two.
Fig. 2 is device experiment loop and signal measurement unit synoptic diagram
11, test sample one, 12, test sample two, 13, stube cable one, 14, stube cable two, 15, cable accessory, 16, the test oil terminal, 17, clamp on amperemeter, 18, the temperature infrared imager, 19, Luo-coil, 20, the ultra-high frequency signal antenna.
Fig. 3 is the signal processing circuit synoptic diagram in the device signal measurement unit
R1, R2, R3, R4 are resistance, and C1, C2, C3 are filter capacitor, and D1, D2, D3, D4 are voltage stabilizing diode.
Embodiment
Through instance the present invention is specifically described below; Be necessary to be pointed out that at this following examples only are used for the present invention is further specified; Can not be interpreted as the restriction to protection domain of the present invention, the person skilled in the art in this field can content make some nonessential improvement and adjustment to the present invention according to the present invention.
Embodiment
The electrical-heating aging test device of cable accessory comprises high-voltage generating unit 1 under the high-voltage great-current, unit, test loop 2, big electric current generating unit 3 and signal measurement unit 4.High-voltage generating unit 1 is connected with unit, test loop 2; High pressure is introduced in the test loop, and unit, test loop 2 passes big electric current generating unit 3, forms the magnetic field coupling; Produce big electric current; During senile experiment, high-voltage generating unit is worked with big electric current generating unit simultaneously, is implemented in the purpose that applies high voltage in the unit, test loop and pass to big electric current.Signal measurement unit 4 is installed in the unit, test loop 2, through the electrical specification parameters such as shelf depreciation in the acquisition testing sample cable accessory, realizes the insulation ag(e)ing state-detection to cable accessory.
High-voltage generating unit 1 comprises does not have dizzy HT testing transformer 5, and input pressure regulator 6, protective resistance 7 and high pressure for connection do not have dizzy lead 8, and the dizzy HT testing transformer 5 of nothing plays high pressure to be taken place; Its input end is connected with input pressure regulator 1; Through the voltage type and the size of input pressure regulator one change transformer input end, correspondingly control the high-pressure side output voltage, the testing transformer high-pressure side is connected with protective resistance 7; Protective resistance is with the output current of limit assay transformer; Transformer is carried out overcurrent protection, and protective resistance is connected with the dizzy lead 8 of nothing, does not have dizzy lead the high pressure that testing transformer produces is incorporated into the test loop;
Unit, test loop 2 is four sections " mouth " font metal loops that the power cable series connection forms; Comprise cable accessory test sample 1 and test sample 2 12 and stube cable 1 and stube cable 2 14; Two groups of cable accessory test sample one ends are processed the cable accessory 15 that there is typical defective mounting inside, during aging test, are convenient to study typical defective mounting quickens insulation degradation under electric heating stress process; The test sample other end inserts in the cable testing oil terminal 16; The test oil terminal inner is full of insulating oil, and service test oil terminal is effectively got rid of the sample other end and introduced the corona interference, makes the discharge signal of test specimen more single; Stube cable 1 and stube cable 2 14 couple together the formation current return with test sample 1 and test sample 2 12; Stube cable 2 14 passes the center of current transformer 9; Form the coupled relation on the magnetic circuit, owing to pass current transformer, stube cable 2 14 is nearest positions of liftoff current potential, pressurization back, whole loop; Its surface evenly puts the multilayer silicone rubber insulation layer, utilizes the problem of the breakdown field strength of solid insulating material greater than the principle solution insulation distance of air breakdown field intensity.The interconnective position of cable all adopts high-voltage connection terminal to connect, and is fixed with grading ring on the connection terminal, prevents that the loop from the joint, back that adds high pressure corona discharge taking place;
Big electric current generating unit 3 comprises straight-through current transformer 9, and input pressure regulator 2 10 is during straight-through current transformer input power-frequency voltage; Flow through exchange current in its primary coil, in the test loop, produce big electric current, play current source through electromagnetic induction principle; The whole test loop is applied electric current; Its input terminal voltage is imported pressure regulator 2 10 controls, changes the size of input voltage, correspondingly changes the size of current that flows through in the winding of the former limit of current transformer; Realization is to the control of test loop electric current, and the electric current that big electric current generating unit produces in the test loop is measured through clamp on amperemeter 17.
Signal measurement unit 4 comprises temperature infrared imager 18, Luo-coil 19, ultra-high frequency antenna 20, signal processing circuit and digital oscilloscope.Temperature infrared imager 18 is monitored the temperature rise situation on cable accessory surface when aging test; Temperature information, the heat generating spot parameter on cable accessory surface are provided; Luo-coil 19 is through the local discharge signal in the EM coupling detection streamer annex, and ultra-high frequency antenna 20 detects local discharge signal through the ultra-high frequency signal that induction cable annex internal discharge produces.The local discharge signal that Luo-coil, ultra-high frequency antenna collect inputs to digital oscilloscope and observes after carrying out signal amplification, Filtering Processing through signal processing circuit.Said signal processing circuit realizes the amplification and the filter function of signal, and its input end connects the resistance R of control high-frequency cut-off frequency
1With capacitor C
1Carry out high-frequency signal filtering, voltage stabilizing diode D
1, D
2Be parallel to input end as the input overvoltage protection, signal behind High frequency filter with the resistance R of control computing enlargement factor
2With R
3Connect feedback resistance R
3Be parallel to operational amplifier U
1Input end and output terminal between, the resistance R of the signal input control low-frequency cut-off frequency after amplifying
4With capacitor C
2Carry out low frequency signal filtering, capacitor C
3With being connected to output terminal after the DC component filtering in the signal, voltage stabilizing diode D
3, D
4Be parallel to output terminal as output over-voltage protection branch road.
The test method of the electrical-heating aging test device of cable accessory comprises the steps: under the high-voltage great-current
1). test is prepared
When cable accessory test sample one was installed with test sample two, the artificial insulation defect of internal production added artificial defect and can quicken the insulation ag(e)ing of cable accessory.Behind the Processing Test sample; Connect high-voltage generating unit 1, unit, test loop 2, big electric current generating unit 3 in the test unit; Signal measurement unit 4 is installed in the test loop, and the use telecommunication cable carries out debugging test to device after measuring-signal is drawn; After it is through the withstand voltage test of dispatching from the factory; Utilize high-voltage generating unit 1 to be forced into measurement of partial discharge voltage, carry out Partial Discharge Detection, the shelf depreciation parameter information of cable accessory under the record original state through 4 pairs of pretreated cable accessories of signal measurement unit.
2) high-voltage great-current is aging
Regulate the output voltage that does not have dizzy HT testing transformer 5 input pressure regulators 1, make the dizzy HT testing transformer of nothing export specified aging voltage, change the voltage type and the size of transformer input end, corresponding control high-pressure side output voltage to unit, test loop 2.Regulate the output voltage of current transformer 9 input pressure regulators 2 10, make and flow through specified aging electric current in the unit, test loop 2.Do not have dizzy HT testing transformer summation current transformer and work simultaneously, apply high pressure over the ground in the test loop, pass to big electric current, carry out the electric heating ageing testing of cable accessory.When device pressurizes through-flow aging test, regulate there is not the input pressure regulator 6 of dizzy HT testing transformer, increase in the testing transformer output voltage simulation electric system in short-term superpotential to the aging accelerating effect of cable accessory insulation; Regulate current transformer input pressure regulator 10, the size that changes electric current in the test loop is simulated the load fluctuation in the electric system, and the electric current that flows through in the loop is measured through clamp on amperemeter 17.
3) gather state of insulation information
When carrying out aging test, the state of insulation information through 4 pairs of cable accessories of signal measurement unit detects.Wherein, serviceability temperature infrared thermoviewer 18 is monitored the surface temperature rise situation of cable accessory when aging test, detects the position that focus is concentrated; Use the interior local discharge signal of Partial Discharge Detection mode detection streamer annex of Luo-coil 19, ultra-high frequency antenna 20; The discharge signal that collects inputs to signal processing circuit; Carry out signal and amplify and filtering, analyze this local discharge signal and can assess the state of insulation of cable accessory.
Claims (6)
1. the electrical-heating aging test device of cable accessory under the high-voltage great-current is characterized in that this test unit comprises high-voltage generating unit (1), unit, test loop (2), big electric current generating unit (3) and (4) four funtion parts of signal measurement unit; High-voltage generating unit (1) is connected with unit, test loop (2), and high pressure is introduced in the test loop; Unit, test loop (2) passes big electric current generating unit (3); The coupling of formation magnetic field produces big electric current, during senile experiment; High-voltage generating unit is worked with big electric current generating unit simultaneously, is implemented in the purpose that applies high voltage in the unit, test loop and pass to big electric current; Signal measurement unit (4) is installed in the unit, test loop (2), through the electrical specification parameters such as shelf depreciation in the acquisition testing sample cable accessory, realizes the insulation ag(e)ing state-detection to cable accessory.
2. the thermal-electrical aging device of cable accessory under the high-voltage great-current according to claim 1; It is characterized in that high-voltage generating unit (1) comprises that the dizzy HT testing transformer (5) of nothing, input pressure regulator one (6), protective resistance (7) and high pressure do not have dizzy lead (8); Not having dizzy HT testing transformer input end is connected with input pressure regulator one; Not having dizzy HT testing transformer output terminal is connected with protective resistance; Protective resistance is connected with the dizzy lead of nothing, does not have dizzy lead the high pressure that testing transformer produces is incorporated into the test loop.
3. the thermal-electrical aging device of cable accessory under the high-voltage great-current according to claim 1; It is characterized in that unit, test loop (2) is four sections " mouth " font metal loops that the power cable series connection forms; Comprise cable accessory test sample one (11) and test sample two (12) and stube cable one (13) and stube cable two (14); One end of two groups of cable accessory test samples is processed the cable accessory (15) that there is typical defective mounting inside; The other end inserts in the cable testing oil terminal (16), and the test oil terminal inner is full of insulating oil, gets rid of the discharge interference that the sample other end is introduced; Stube cable one (13) and stube cable two (14) couple together the formation current return with test sample one (11) and test sample two (12); Stube cable two (14) passes the center of current transformer (9); Form the coupled relation on the magnetic circuit; Owing to pass the current transformer center, stube cable two (14) is the nearest position of liftoff current potential, pressurization back, whole loop, and its surface evenly puts the multilayer silicone rubber insulation layer; Utilize the breakdown field strength of solid insulating material effectively to solve the problem of insulation distance greater than the principle of air breakdown field intensity; The interconnective position of cable all adopts high-voltage connection terminal to connect, and is fixed with grading ring on the high-voltage connection terminal, prevents that the loop under high pressure corona discharge taking place the joint.
4. the thermal-electrical aging device of cable accessory under the high-voltage great-current according to claim 1; It is characterized in that big electric current generating unit (3) comprises straight-through current transformer (9); Input pressure regulator two (10) behind the straight-through current transformer input power-frequency voltage, flows through exchange current in its primary coil; In the test loop, produce big electric current through electromagnetic induction principle; The current transformer input terminal voltage is imported pressure regulator two (10) controls, changes the size of input voltage, correspondingly changes the size of current that flows through in the current transformer primary coil; Realization is to the control of test loop electric current, and the electric current that big electric current generating unit produces in the test loop is measured through clamp on amperemeter (17).
5. the thermal-electrical aging device of cable accessory under the high-voltage great-current according to claim 1; It is characterized in that signal measurement unit (4) comprises temperature infrared imager (18), Luo-coil (19), ultra-high frequency antenna (20), signal processing circuit and digital oscilloscope, temperature infrared imager (18) is monitored the temperature rise situation on cable accessory surface when aging test; Luo-coil, ultra-high frequency antenna carry out signal amplification, Filtering Processing with the local discharge signal that collects through signal processing circuit, input to digital oscilloscope and observe; Said signal processing circuit realizes filtering and enlarging function, and its connected mode is: input end connects the resistance R of control high-frequency cut-off frequency
1With capacitor C
1Carry out high-frequency signal filtering, voltage stabilizing diode D
1, D
2Be parallel to input end as the input overvoltage protection, signal behind High frequency filter with the resistance R of control computing enlargement factor
2With R
3Connect feedback resistance R
3Be parallel to operational amplifier U
1Input end and output terminal between, the resistance R of the signal input control low-frequency cut-off frequency after amplifying
4With capacitor C
2Carry out low frequency signal filtering, capacitor C
3With being connected to output terminal after the DC component filtering in the signal, voltage stabilizing diode D
3, D
4Be parallel to output terminal as output over-voltage protection branch road.
6. like the test method of the thermal-electrical aging device of cable accessory under the said high-voltage great-current of one of claim 1～5, it is characterized in that this test method comprises the steps:
1). test is prepared
When cable accessory test sample one is installed with test sample two; The insulation defect that internal production is artificial; Add artificial defect and can quicken the insulation ag(e)ing of cable accessory, behind the Processing Test sample, connect high-voltage generating unit (1), unit, test loop (2), big electric current generating unit (3) in the test unit; Signal measurement unit (4) is installed in the test loop; Use telecommunication cable that measuring-signal is drawn and carry out debugging test afterwards, after device is through withstand voltage test, utilize high-voltage generating unit (1) to be forced into measurement of partial discharge voltage; Through signal measurement unit (4) pretreated cable accessory is carried out Partial Discharge Detection, the shelf depreciation parameter information of cable accessory under the record original state.
2). high-voltage great-current is aging
Regulate the output voltage that does not have dizzy HT testing transformer (5) input pressure regulator one (6); Make the dizzy HT testing transformer of nothing export specified aging voltage to unit, test loop (2); Change the voltage type and the size of transformer input end, correspondingly control the high-pressure side output voltage, regulate the output voltage of current transformer (9) input pressure regulator (10); Make and flow through specified aging electric current in the unit, test loop (2); The electric current that flows through in the loop is measured through clamp on amperemeter, does not have dizzy HT testing transformer summation current transformer and works simultaneously, and the electric heating ageing testing of cable accessory is carried out in the test loop.
3). gather state of insulation information
During aging test, detect the surface temperature rise situation of serviceability temperature infrared thermoviewer (18) monitoring cable accessory through the state of insulation information of signal measurement unit (4) to cable accessory; Use the local discharge signal of Luo-coil (19), (20) two kinds of Partial Discharge Detection mode detection streamers of ultra-high frequency antenna annex; The discharge signal that collects inputs to signal processing circuit; Carry out signal and amplify and filtering, analyze this local discharge signal the state of insulation of cable accessory is assessed.
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| CN112379222A (en) * | 2020-10-23 | 2021-02-19 | 深圳市深电电力设备发展有限公司 | Cable accessory withstand voltage testing device capable of actively reporting fault |
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