1. A UHF partial discharge and its location measuring device for high-voltage power devices, comprising:
a partial discharge sensor that is attached onto a DUT (Device Under Test) to detect a partial discharge signal;
an external noise sensor that is located outside the DUT to detect an external noise signal;
an analogue-digital converter that receives a partial discharge signal from the partial discharge sensor and an external noise signal from the external noise sensor and digitalizes the received signals;
a peak detector that extracts a peak value of the digitalized signal for each and every sensor;
a partial discharge signal processor that generates a peak signal for a phase and time of a power signal, density of the peak signal for the phase of the power signal, and a long-term variation in trend of a signal from the extracted peak value for each and every sensor;
an arrival time detector that detects a start point of the partial discharge signal and detects an arrival time;
a discharge location processor that yields a discharge location from a location coordinate where the partial discharge sensor is positioned and the arrival time and performs a statistical process on the yielded discharge location according to the number of times of the yields; and
a display unit that displays the peak signal, the density, the variation in trend, and the discharge location.
2. The UHF partial discharge and its location measuring device for high-voltage power devices of claim 1, further comprising:
a noise reducer that reduces or removes noises from the digitalized partial discharge signal.
3. The UHF partial discharge and its location measuring device for high-voltage power devices of claim 2, wherein the noise reducer removes a noise signal measured at the partial discharge sensor and reduces a noise signal other than the partial discharge signal from the digitalized partial discharge signal in a case where the magnitude of the external noise signal is equal to or larger than a magnitude preset by a user.
4. The UHF partial discharge and its location measuring device for high-voltage power devices of claim 3, wherein the discharge location processor calculates each distance by multiplying the arrival time by signal transmission velocity and determines the intersection of circular trajectories, each of which corresponds to the distance, as a position where the partial discharge occurs.
5. The UHF partial discharge and its location measuring device for high-voltage power devices of claim 4, wherein in a case where the position where the partial discharge occurs is determined as a no-discharge-occur location, another location closest to the detected discharge location, where any discharge may occur, is displayed as well.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1.-16. (canceled)
17. An image forming apparatus comprising:
a first applying unit that applies a first liquid for increasing the wettability of a surface of an intermediate transfer medium to the intermediate transfer medium;
a second applying unit that applies a second liquid for decreasing the flowability of an ink to the intermediate transfer medium to which the first liquid has been applied;
a third applying unit that applies the ink to the intermediate transfer medium, to which the first liquid and the second liquid have been applied, from an ink-jet head to form an image of the ink on the intermediate transfer medium; and
a transferring portion for transferring the ink image formed on the intermediate transfer medium to a recording medium.
18. An image forming apparatus comprising:
a first applying unit that applies a first liquid containing a surfactant to an intermediate transfer medium having a surface containing at least one material from among a fluororubber and a silicone rubber;
a second applying unit that applies a second liquid for aggregating a coloring material in an ink to the intermediate transfer medium to which the first liquid has been applied;
a third applying unit that applies the ink to the intermediate transfer medium, to which the first liquid and the second liquid have been applied, from an ink-jet head to form an image of the ink on the intermediate transfer medium; and
a transferring portion for transferring the ink image formed on the intermediate transfer medium to a recording medium.
19. An image forming apparatus comprising:
a first applying unit that applies a first liquid for increasing the wettability of a surface of the intermediate transfer medium to the intermediate transfer medium;
a second applying unit that applies a second liquid, which reacts with an ink, to the intermediate transfer medium to which the first liquid has been applied;
a third applying unit that applies the ink to the intermediate transfer medium, to which the first liquid and the second liquid have been applied, from an ink-jet head to form an ink image on the intermediate transfer medium; and
a transferring portion for transferring the ink image formed on the intermediate transfer medium to a recording medium.
20. The image forming apparatus according to claim 19, wherein the surface of the intermediate transfer medium contains a material containing fluorine or silicone.
21. The image forming apparatus according to claim 19, wherein the surface of the intermediate transfer medium has a rubber hardness ranging from 10 to 100\xb0.
22. The image forming apparatus according to claim 19, wherein the first liquid contains a surfactant.
23. The image forming apparatus according to claim 19, wherein a position to which the first liquid is applied is changed according to an image to be formed.
24. The image forming apparatus according to claim 19, wherein the second liquid contains a metal ion.
25. The image forming apparatus according to claim 24, wherein the second liquid contains a surfactant.
26. The image forming apparatus according to claim 19, wherein a position to which the second liquid is applied is changed according to an image to be formed.
27. The image forming apparatus according to claim 19, wherein at least one of the first liquid, the second liquid and the ink contains a crosslinking agent.
28. The image forming apparatus according to claim 19, further comprising facilitating means for facilitating the removal of a solvent contained in the ink image formed on the intermediate transfer medium.
29. The image forming apparatus according to claim 19, wherein at least one of the first liquid and the second liquid is applied by using an ink-jet head.