CN104931835A - Stranded wire sample insulation accelerated aging life experimental method with electromagnetic acting force - Google Patents
Stranded wire sample insulation accelerated aging life experimental method with electromagnetic acting force Download PDFInfo
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- CN104931835A CN104931835A CN201510352726.6A CN201510352726A CN104931835A CN 104931835 A CN104931835 A CN 104931835A CN 201510352726 A CN201510352726 A CN 201510352726A CN 104931835 A CN104931835 A CN 104931835A
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- magnetic pole
- insulation sample
- insulation
- lower magnetic
- twisted wire
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Abstract
The invention discloses a stranded wire sample insulation accelerated aging life experimental method with an electromagnetic acting force. An air-gap magnetic field is established between an upper magnetic pole and a lower magnetic pole by taking permanent magnets as a magnetic field source, a stranded wire pair insulation sample is placed on an insulation sample installation plane in the air-gap magnetic field, and a pulse current is applied to conductors of the stranded wire pair insulation sample to generate an electromagnetic acting force. The insulation sample installation plane is positioned on an iron core of the lower magnetic pole, and is an exposed smooth conductive plane. Both ends of the insulation sample installation plane are each provided with an insulation sample conductor lead wire insulation region, a withstand voltage value between the insulation sample conductor lead wire insulation regions and the iron core of the lower magnetic pole is not less than 10kV, and the heat resistance is not less than 250 DEG C. During the stranded wire pair insulation sample accelerated aging accelerated aging life test, a stress factor which is the electromagnetic acting force is added besides an electrical stress and a temperature stress, and the experimental environment is closer to the environmental conditions under which electrical equipment is applied.
Description
Technical field
The present invention relates to a kind of frequency variable motor magnet-wire twisted wire comprising the electromagnetic force factor to insulation pulse voltage accelerating aging test method.
Background technology
The electrical endurance of electrical insulating material and electrical equipment insulation system directly affects life-span and the security of operation of electrical equipment, in order to obtain the electric life of the new insulation system of electrical equipment fast, need the ambient stress that dry run process insulation system bears, under the prerequisite not changing failure of insulation mechanism, the stress value born by suitably increasing insulation system accelerates insulation ag(e)ing process, by confirming the quality of insulation system performance with the contrast of standard sample and improving degree, or utilize life model to estimate the life information of insulation system under normal applied stress environment.The speeds control of current motor and the excitation con-trol etc. of generation of electricity by new energy widely use pulse-length modulation (PWM) technology, what in these applications, insulation system bore is not traditional direct current and power frequency sinusoidal ac, but the high-frequency pulse voltage continued.In continuous high frequency pulse voltage applied environment, the amplitude of pulse voltage and porch voltage change ratio, pulsed frequency, temperature, electromagnetic force are the main stress affecting insulation ag(e)ing rate.The insulation accelerated senile experiment device of Pulse Electric stress of current development only comprises amplitude and frequency, temperature three stress parameters of pulse voltage, be mainly used in research pulse voltage amplitude, pulsed frequency, these stress factors of temperature to the impact of insulation life, also do not consider that mechanical stress that electromagnetic force produces is on the impact of insulation ag(e)ing rate.In the insulation accelerated senile experiment of Pulse Electric stress, except electric stress and temperature stress, add this stress factor of electromagnetic force again, more completely can embody in electric equipment operation process the ambient stress of bearing that insulate, more accurately and all sidedly study insulation ag(e)ing rule under Pulse Electric ambient stress.
Summary of the invention
The object of this invention is to provide a kind of twisted wire to insulation sample pulse voltage accelerated deterioration insulation life process of the test electromagnetic force production method, thus build more comprehensively close to a kind of insulation accelerated aging life-span test unit of pulse voltage containing electromagnetic force of true stress environment.
Under pulse voltage applied environment, the electric stresss such as the amplitude of pulse voltage and porch voltage change ratio, pulsed frequency, the mechanical stress that temperature stress, electromagnetic action produce is the main stress affecting insulation life.The Pulse Electric stress accelerated deterioration insulation life test of common twisted wire to insulation sample be by apply pulse voltage to sample obtain need electric stress, sample be placed in require that the homogeneous temperature field of temperature obtains temperature stress, do not comprise this stress factor of electromagnetic force.Apply on electric stress and temperature stress basis at twisted pair wire to insulation sample, a pair permanent magnet is utilized to produce an air-gap field perpendicular to twisted wire on the direction of insulation sample, then in twisted wire is to the conductor of insulation sample, pass through bipolarity or unipolar pulse electric current, then this conductor will be subject to the effect of electromagnetic force.The magnetic induction density in magnetic field is represented with B,
lrepresent the effective length of conductor in magnetic field,
irepresent the electric current in conductor, then electromagnetic force F=B ×
l×
i, by changing electric current
isize and Orientation, just can change the size and Orientation of electromagnetic force.The method can carry out comprising electricity, temperature, the electromagnetic force equal stress factor twisted wire to the test of insulation sample accelerated deterioration insulation life.
Concrete steps are:
(1) between upper magnetic pole and lower magnetic pole, air-gap field is set up as Magnetic Field Source with permanent magnet, twisted wire is placed on the insulation sample mounting plane in air-gap field to insulation sample, apply pulse current to the conductor of insulation sample and produce electromagnetic force, twisted wire is made up of electromagnetic wire conductor 3A and electromagnetic wire conductor 3B insulation sample 3.
(2) lower magnetic pole is made up of lower magnetic pole iron core (7), lower magnetic pole permanent magnet (5) and lower magnetic pole permanent magnet magnetic conduction cover plate (10); The top of lower magnetic pole iron core (7) arranges the mounting plane of insulation sample mounting plane and upper pole core (8); lower magnetic pole iron core (7) is slotted in bottom and in groove, is installed lower magnetic pole permanent magnet (5), utilizes lower magnetic pole permanent magnet magnetic conduction cover plate (10) to cover lower magnetic pole permanent magnet (5); The upper pole core mounting plane of lower magnetic pole iron core (7) installs pole core (8); upper pole core (8) is installed magnetic pole permanent magnet (6), forms upper magnetic pole by upper magnetic pole permanent magnet (6) and upper pole core (8); Upper magnetic pole permanent magnet (6) is extremely relative with the N-S of lower magnetic pole permanent magnet (5), and the magnetic circuit consisted of lower magnetic pole iron core (7) and upper pole core (8) forms the air-gap field of gas length d=10mm ~ 40mm above insulation sample mounting plane;
(3) the insulation sample mounting plane of lower magnetic pole iron core is exposed metal conductive plane, and this plane answers flat smooth impulse-free robustness; Twisted wire is set at the two ends of insulation sample mounting plane to insulation sample lead wire of conductor district insulcrete; Twisted wire is identical with insulation sample installed surface height to the plane of insulation sample lead wire of conductor district insulcrete, twisted wire is not less than 10kV to the proof voltage value between insulation sample lead wire of conductor district's insulcrete and lower magnetic pole iron core 8, and can keep stable insulation for a long time at 250 DEG C and following temperature; Twisted wire is placed on the insulation sample mounting plane of lower magnetic pole iron core insulation sample, utilizes stationary installation twisted pair wire to be fixed insulation sample; The G point ground connection of lower magnetic pole iron core, the E end of twisted wire to the electromagnetic wire conductor 3A of insulation sample is connected to the G point of lower magnetic pole iron core, by the G of lower magnetic pole iron core, the E of twisted wire to the electromagnetic wire conductor 3A of insulation sample is held ground connection, apply pulse current to the electromagnetic wire conductor 3A of twisted wire to insulation sample and make it under air-gap field effect, produce electromagnetic action stress; Between twisted wire is held the E end of the electromagnetic wire conductor 3A of insulation sample and the H of twisted wire to the electromagnetic wire conductor 3B of the sample that insulate, apply pulse voltage, twisted pair wire applies Pulse Electric stress to insulation sample.
(4) current value of pulse current source
i fregulate between 0 ~ 100A, pulsed frequency
f iFregulate between 1kHz ~ 20kHz, select a kind of current waveform output in bipolarity or unipolar pulse electric current; The I of pulse current source
+export the F end of termination twisted wire to the electromagnetic wire conductor 3A of insulation sample, another output terminal I of pulse current source
-connect the E end of twisted wire to the electromagnetic wire conductor 3A of insulation sample, make twisted wire flow through pulse current I in the electromagnetic wire conductor 3A of insulation sample
f, in magnetic field, produce electromagnetic force F=
f(I
f).
(5) pulse voltage source voltage peak U
pregulate between 100V ~ 3000V, pulsed frequency f
uFregulate between 1kHz ~ 20kHz, select a kind of voltage waveform in bipolarity or unipolar pulse voltage to export; An output terminal U of pulse voltage source
+by current-limiting resistance R
xbe connected to the H end of twisted wire to the electromagnetic wire conductor 3B of insulation sample, the U of pulse voltage source
-end is connected to the G point of lower magnetic pole iron core, G point ground connection, thus applies Pulse Electric stress between twisted wire is to electromagnetic wire conductor 3A and 3B of insulation sample.
(6) twisted wire is placed in the homogeneous temperature field that can set also energy control temperature to insulation sample, stationary installation, lower magnetic pole permanent magnet and upper magnetic pole permanent magnet, lower magnetic pole iron core and upper pole core, obtains temperature stress.
The present invention in the test of insulation sample accelerated deterioration insulation life, except electric stress and temperature stress, also added this stress factor of electromagnetic force, the environmental baseline that experimental situation is applied closer to electrical equipment at twisted wire.
Accompanying drawing explanation
Fig. 1 is the test principle figure of twisted wire of the present invention to insulation sample.
Fig. 2 is the test unit front view of embodiment of the present invention twisted wire to insulation sample.
Fig. 3 is that embodiment of the present invention Fig. 2 twisted wire is to insulation sample experiment device a-a sectional view
Fig. 4 is that embodiment of the present invention Fig. 2 twisted wire is to insulation sample experiment device side view.
Mark in figure: 1-pulse voltage source; 2-pulse current source; 3-twisted wire is to insulation sample; 4-stationary installation; 5-lower magnetic pole permanent magnet, the upper magnetic pole permanent magnet of 6-; 7-lower magnetic pole iron core; The upper pole core of 8-; 9-twisted wire is to insulation sample lead wire of conductor district insulcrete; 10-lower magnetic pole permanent magnet magnetic conduction cover plate.
Twisted wire is made up of electromagnetic wire conductor 3A and electromagnetic wire conductor 3B insulation sample 3.
Embodiment
embodiment:
Twisted wire to the test principle of insulation sample as shown in Figure 1.
(1) between upper magnetic pole and lower magnetic pole, air-gap field is set up as Magnetic Field Source with magnetic pole permanent magnet 6 and lower magnetic pole permanent magnet 5, twisted wire is placed on the insulation sample mounting plane in air-gap field to insulation sample 3, twisted wire is made up of electromagnetic wire conductor 3A and electromagnetic wire conductor 3B insulation sample 3, applies pulse current produce electromagnetic force to the electromagnetic wire conductor 3A of twisted wire to insulation sample 3.
(2) lower magnetic pole is made up of lower magnetic pole iron core 7, lower magnetic pole permanent magnet 5 and lower magnetic pole permanent magnet magnetic conduction cover plate 10; The top of lower magnetic pole iron core 7 arranges the mounting plane of insulation sample mounting plane and upper pole core 8, and lower magnetic pole iron core 7 is slotted in bottom and in groove, installed lower magnetic pole permanent magnet 5, utilizes lower magnetic pole permanent magnet magnetic conduction cover plate 10 to cover lower magnetic pole permanent magnet 5; The upper pole core mounting plane of lower magnetic pole iron core 7 installs pole core 8, upper pole core 8 installs magnetic pole permanent magnet 6, form upper magnetic pole by upper magnetic pole permanent magnet 6 and upper pole core 8; Upper magnetic pole permanent magnet 6 is extremely relative with the N-S of lower magnetic pole permanent magnet 5, and the magnetic circuit consisted of lower magnetic pole iron core 7 and upper pole core 8 forms the air-gap field of gas length d=10mm ~ 40mm above insulation sample mounting plane.
(3) twisted wire of lower magnetic pole iron core 7 is exposed metal conductive plane to insulation sample mounting plane, and this plane answers flat smooth impulse-free robustness; Twisted wire is set at the two ends of insulation sample mounting plane to insulation sample lead wire of conductor district insulcrete 9; The plane of twisted wire to insulation sample lead wire of conductor district insulcrete 9 is identical to the sample installed surface height that insulate with twisted wire, and twisted wire is not less than 10kV to the proof voltage value between insulation sample lead wire of conductor district insulcrete 9 and lower magnetic pole iron core 7, and heat resistance is not less than 250 DEG C; Twisted wire is placed on the insulation sample mounting plane of lower magnetic pole iron core 7 insulation sample 3, utilizes stationary installation 4 twisted pair wire to be fixed insulation sample 3.Apply pulse current to the electromagnetic wire conductor 3A of twisted wire to insulation sample 3 and produce electromagnetic action stress under air-gap field effect, between twisted wire is held the E end of the electromagnetic wire conductor 3A of insulation sample 3 and the H of electromagnetic wire conductor 3B, apply pulse voltage produce Pulse Electric stress; The E end of twisted wire to the electromagnetic wire conductor 3A of insulation sample 3 is connected to the G point of lower magnetic pole iron core 7, this G point ground connection.
(4) pulse current source 2 current value
i fregulate between 0 ~ 100A, pulsed frequency
f iFregulate between 1kHz ~ 20kHz, select a kind of current waveform output in bipolarity or unipolar pulse electric current; The I of pulse current source 2
+export the F end of termination twisted wire to the electromagnetic wire conductor 3A of insulation sample 3, another output terminal I of pulse current source 2
-connect the E end of twisted wire to the electromagnetic wire conductor 3A of insulation sample 3, make twisted wire flow through pulse current I in the electromagnetic wire conductor 3A of insulation sample 3
f, in magnetic field, produce electromagnetic force F=
f(I
f).
(5) pulse voltage source 1 voltage peak U
pregulate between 100V ~ 3000V, pulsed frequency f
uFregulate between 1kHz ~ 20kHz, select a kind of voltage waveform in bipolarity or unipolar pulse voltage to export; An output terminal U of pulse voltage source 1
+by current-limiting resistance R
xbe connected to the H end of twisted wire to the electromagnetic wire conductor 3B of insulation sample 3, the U of pulse voltage source 1
-end is connected to the G point of lower magnetic pole iron core 7, G point ground connection, thus applies Pulse Electric stress between twisted wire is to electromagnetic wire conductor 3A and the 3B of insulation sample 3.
(6) twisted wire is placed in the homogeneous temperature field that can set also energy control temperature to insulation sample 3, stationary installation 4, lower magnetic pole permanent magnet 5 and upper magnetic pole permanent magnet 6, lower magnetic pole iron core 7 and upper pole core 8, obtains temperature stress.
Claims (1)
1., containing the insulation accelerated aging life-span experimental technique of twisted wire sample of electromagnetic force, it is characterized in that concrete steps are:
(1) between upper magnetic pole and lower magnetic pole, air-gap field is set up as Magnetic Field Source with permanent magnet, twisted wire is placed on twisted wire in air-gap field on insulation sample mounting plane to insulation sample (3), twisted wire is made up of electromagnetic wire conductor 3A and electromagnetic wire conductor 3B insulation sample (3), applies pulse current produce electromagnetic force to twisted wire to the electromagnetic wire conductor 3A of insulation sample (3);
(2) lower magnetic pole is made up of lower magnetic pole iron core (7), lower magnetic pole permanent magnet (5) and lower magnetic pole permanent magnet magnetic conduction cover plate (10); The top of lower magnetic pole iron core (7) arranges the mounting plane of insulation sample mounting plane and upper pole core (8); lower magnetic pole iron core (7) is slotted in bottom and in groove, is installed lower magnetic pole permanent magnet (5), utilizes lower magnetic pole permanent magnet magnetic conduction cover plate (10) to cover lower magnetic pole permanent magnet (5); The upper pole core mounting plane of lower magnetic pole iron core (7) installs pole core (8); upper pole core (8) is installed magnetic pole permanent magnet (6), forms upper magnetic pole by upper magnetic pole permanent magnet (6) and upper pole core (8); Upper magnetic pole permanent magnet (6) is extremely relative with the N-S of lower magnetic pole permanent magnet (5), and the magnetic circuit consisted of lower magnetic pole iron core (7) and upper pole core (8) forms the air-gap field of gas length d=10mm ~ 40mm above insulation sample mounting plane;
(3) twisted wire of lower magnetic pole iron core (7) is exposed metal conductive plane to insulation sample mounting plane, and this plane answers flat smooth impulse-free robustness; At the two ends of insulation sample mounting plane, twisted wire is set to insulation sample lead wire of conductor district insulcrete (9); Twisted wire is identical with insulation sample installed surface height to the plane of insulation sample lead wire of conductor district insulcrete (9), twisted wire is not less than 10kV to the proof voltage value between insulation sample lead wire of conductor district insulcrete (9) and lower magnetic pole iron core (7), and can keep stable insulation for a long time at 250 DEG C and following temperature; Twisted wire is placed on the insulation sample mounting plane of lower magnetic pole iron core insulation sample (3), utilizes stationary installation (4) twisted pair wire to be fixed insulation sample (3); The G point ground connection of lower magnetic pole iron core (7), the E end of twisted wire to the electromagnetic wire conductor 3A of insulation sample (3) is connected to the G point of lower magnetic pole iron core (7), by the G of lower magnetic pole iron core (7), twisted wire is held ground connection to the E of the electromagnetic wire conductor 3A of insulation sample (3), to twisted wire, pulse current is applied to the electromagnetic wire conductor 3A of insulation sample (3) and make it under air-gap field effect, produce electromagnetic action stress; Between twisted wire is held the E end of the electromagnetic wire conductor 3A of insulation sample (3) and the H of twisted wire to the electromagnetic wire conductor 3B of the sample (3) that insulate, apply pulse voltage, twisted pair wire applies Pulse Electric stress to insulation sample (3);
(4) current value of pulse current source (2)
i fregulate between 0 ~ 100A, pulsed frequency
f iFregulate between 1kHz ~ 20kHz, select a kind of current waveform output in bipolarity or unipolar pulse electric current; The I of pulse current source (2)
+export the F end of termination twisted wire to the electromagnetic wire conductor 3A of insulation sample (3), another output terminal I of pulse current source (2)
-connect the E end of twisted wire to the electromagnetic wire conductor 3A of insulation sample (3), make twisted wire flow through pulse current I in the electromagnetic wire conductor 3A of insulation sample (3)
f, in magnetic field, produce electromagnetic force F=
f(I
f);
(5) pulse voltage source (1) voltage peak U
pregulate between 100V ~ 3000V, pulsed frequency f
uFregulate between 1kHz ~ 20kHz, select a kind of voltage waveform in bipolarity or unipolar pulse voltage to export; An output terminal U of pulse voltage source (1)
+by current-limiting resistance R
xbe connected to the H end of twisted wire to the electromagnetic wire conductor 3B of insulation sample (3), the U of pulse voltage source (1)
-end is connected to the G point of lower magnetic pole iron core (7), G point ground connection, thus applies Pulse Electric stress between twisted wire is to electromagnetic wire conductor 3A and 3B of insulation sample (3);
(6) twisted wire is placed in the homogeneous temperature field that can set also energy control temperature to insulation sample (3), stationary installation (4), lower magnetic pole permanent magnet (5) and upper magnetic pole permanent magnet (6), lower magnetic pole iron core (7) and upper pole core (8), obtains temperature stress.
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| CN201510352726.6A CN104931835B (en) | 2015-06-25 | 2015-06-25 | The insulation accelerated aging life-span experimental method of twisted wire sample containing electromagnetic force |
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Cited By (2)
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| CN106569111A (en) * | 2016-10-28 | 2017-04-19 | 桂林理工大学 | Electromagnetic force generation method in electrical insulation film pulse voltage accelerated aging experiment |
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Application publication date: 20150923 Assignee: Liuzhou Liudi Intelligent Technology Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2022450000092 Denomination of invention: Test method for accelerated aging life of stranded wire specimen with electromagnetic force Granted publication date: 20171212 License type: Common License Record date: 20221121 |
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