Method and system for partial discharge testing of an insulation component
View Patent ↗The disclosure relates to a method for partial discharge testing of an insulation component, wherein at least one X-ray pulse is applied to the insulation component, an AC voltage is applied to the insulation component and the partial discharge induced by the at least one X-ray pulse is measured, wherein the dose rate of the at least one X-ray pulse is at least about 10 −2 Gray/s. The disclosure relates further to a system for partial discharge testing of an insulation component which includes a flash X-ray source for generating at least one X-ray pulse, an AC voltage source, a voltage sensor, a partial discharge sensor and a partial discharge detection device for evaluating the measured partial discharge.
1. Method for partial discharge testing of an insulation component, comprising:
a) applying an AC voltage to an insulation component;
b) applying at least one X-ray pulse to the insulation component; and
c) measuring the partial discharge induced by the at least one X-ray pulse; wherein a dose rate of the at least one X-ray pulse inside the insulated component is at least 10 −2 Gray/s.
2. Method according to claim 1 , wherein the dose rate of the at least one X-ray pulse in the insulated component is about 100 Gray/s.
3. Method according to claim 2 , wherein the duration of the at least one X-ray pulse corresponds to a recombination time of free electrons and ions inside a void filled with one or more gases.
4. Method according to claim 3 , wherein the duration of the at least one X-ray pulse is less than 1 ms.
5. Method according to claim 4 , wherein the duration of the at least one X-ray pulse is less than 100 ns.
6. Method according to claim 4 , wherein the partial discharge induced by the at least one X-ray pulse is measured after application of the at least one X-ray pulse has ended.
7. Method according to claim 1 , wherein a length of the at least one X-ray pulse corresponds to a life time of a partial discharge.
8. Method according to claim 1 , wherein the partial discharge induced by the at least one X-ray pulse is measured after application of the at least one X-ray pulse has ended.
9. Method according to claim 8 , wherein the at least one X-ray pulse is applied at about a predefined modulus of the AC voltage.
10. Method according to claim 1 , wherein the at least one X-ray pulse is applied at about a predefined modulus of the AC voltage.
11. Method according to claim 7 , wherein the AC voltage is measured by a voltage sensor that supplies a measured value of the AC voltage to a control unit and wherein the control unit triggers a flash X-ray source to generate the X-ray pulse when the measured value of the AC voltage reaches a pre-defined value.
12. Method according to claim 1 , wherein several X-ray pulses are applied, each X-ray pulse being applied at a different value of the AC voltage corresponding to a different time instance, wherein different values of the AC voltage are increasing or decreasing over time.
13. Method according to claim 1 , wherein several X-ray pulses are applied at different locations of the insulation component.
14. Method according to claim 1 , wherein the duration of the at least one X-ray pulse corresponds to a recombination time of free electrons and ions inside a void filled with one or more gases.
15. System for partial discharge testing of an insulation component, comprising:
an X-ray source for generating at least one X-ray pulse;
an AC voltage source; a voltage sensor;
a partial discharge sensor; and
a partial discharge detection apparatus for evaluating a measured partial discharge, wherein the X-ray source is a flash X-ray source.
16. System according to claim 15 , wherein the X-ray source is configured for producing a dose rate of the at least one X-ray pulse of at least 10.sup.−2 Gray/s inside an insulation component to be tested.
17. System according to claim 16 , comprising: a control unit is provided that is constructed such that it triggers the flash X-ray source to generate an X-ray pulse, when a value of the AC voltage measured by the voltage sensor reaches a pre-defined value.
18. System according to claim 17 , wherein the flash X-ray source comprises:
an aperture whose position and/or aperture area is altered.
19. System according to claim 15 , comprising: a control unit is provided that is constructed such that it triggers the flash X-ray source to generate an X-ray pulse, when a value of the AC voltage measured by the voltage sensor reaches a pre-defined value.
20. System according to claim 15 , wherein the flash X-ray source comprises:
an aperture whose position and/or aperture area is altered.