No. | Location | Item |
| Inspection |
| Criteria | Disposition | Remarks | |||||
|
|
|
|
| method |
|
|
|
|
|
| ||
3 | Insulator | Dust, foreign |
| Visual |
|
| Make sure there | Wipe with a | If damaged, | ||||
|
| matter or |
| inspection. |
| is no dust, | clean dry cloth. | contact | |||||
|
| damage |
|
|
|
|
| foreign matter or |
| Toshiba. | |||
|
|
|
|
|
|
|
|
| breakage. |
|
| ||
4 | Auxiliary | Terminals |
| Visual |
|
| Make sure | Repair if | See Table 6 | ||||
| switch | loose or |
| inspection. |
| terminals are not | disconnected. | for | |||||
|
| disconnected |
| Tighten using a |
| loose or | Tighten if | tightening | |||||
|
|
|
|
| screwdriver. |
| disconnected. | loose. | torque. | ||||
|
| Case/contacts |
| Visual |
|
| Make sure there | Replace if |
| ||||
|
|
|
|
| inspection |
| is no damage or | damaged or |
| ||||
|
|
|
|
|
|
|
|
| Warping. | warped. |
| ||
5 | Control | Smooth |
| Supply |
|
| Make sure circuit | If circuit fails to |
| ||||
| circuits | movement |
| electricity |
| operates | operate, check |
| |||||
|
| when |
| to operate the |
| smoothly. | the cause and |
| |||||
|
| electricity is |
| circuit. |
|
|
|
|
| repair. |
| ||
|
| supplied |
|
|
|
|
|
|
|
|
|
| |
|
| Terminals |
| Visual |
|
| Make sure | Repair if | See Table 6 | ||||
|
| loose or |
| inspection |
| terminals are not | disconnected. | for | |||||
|
| disconnected |
| Tighten using a |
| loose or | Tighten if | tightening | |||||
|
|
|
|
| screwdriver. |
| disconnected. | loose. | torques. | ||||
6 | Insulation |
|
|
|
|
|
|
|
|
|
| If the insulation |
|
| resistance |
|
|
|
|
|
|
|
| resistance |
| ||
|
| Measurement |
|
| Insulation |
| Tester |
|
| ||||
| measurement |
| point |
|
| resistance |
|
|
| between the |
| ||
|
|
| Main conductor to |
| 500MΩ |
| 1000 V |
| main circuit |
| |||
|
|
|
|
|
| terminals is |
| ||||||
|
|
| ground |
|
| or greater |
|
|
|
| |||
|
|
|
|
|
|
|
| low, wipe the |
| ||||
|
|
| Group of control |
| 2MΩ |
| 500 V |
|
| ||||
|
|
|
|
|
| vacuum valve |
| ||||||
|
|
| circuits to ground |
| or greater |
|
|
|
| ||||
|
|
|
|
|
|
| and insulator |
| |||||
|
|
| Between main |
|
| 100MΩ |
| 1000 V |
|
| |||
|
|
|
|
|
|
| surface with a |
| |||||
|
|
| circuit |
|
| or greater |
|
|
|
| |||
|
|
|
|
|
|
|
| clean dry cloth |
| ||||
|
|
| terminals |
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
| and repeat the |
| ||
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
| test. |
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
6.5 Vacuum Check
A sufficient level of vacuum is necessary for proper performance of the vacuum interrupters. Although vacuum leaks are rare, the vacuum integrity should be checked periodically. The relationship between dielectric breakdown voltage of the contact gap and internal vacuum interrupter pressure has been found to be generally predictable. Therefore, vacuum interrupter integrity is checked by performing a high potential test across the open gap of the interrupter.
TEST EQUIPMENT:
- 26 -
