Menu
Toshiba VK Series Instructions Manual
                                                               |
MAINTENANCEPage 40VACUUM CHECK PROCEDURE FOR:6M/P/Q50Procedure:1) Voltage is to be applied between theterminals of the vacuum interrupter2) Start at zero and increase voltage gradually3) If ammeter shows current flow, reducevoltage to zero and again increase.4) Repeat steps (2) and (3) a few times.10Q4010M/P/Q50The relationship between the dielectricbreakdown voltage and the vacuum internalpressure is shown in Fig. 54.riWAMH Radiation Exposure Hazard. X-rays may cause illness or injury. Stay at least1 meter (3.3 ft) away from circuit breakerduring this test.Criteria:1) If the current increases with a voltageincrease, the interrupter is defective.2) If zero, or negligible (less than 0.5 A)current is found with a voltage increase,the interrupter is good.Hazardous voltages arepresent during dielectric testing which canresult in severe injury or death. Only qualifiedpersonnel should conduct this testing.Set Up:1) Test circuit: Fig. 492) Circuit Breaker: Test in open "tripped”position3) Expected Failure Voltage Range: 17-21kVac4) Applied Test Voltage ( Vapp): 25 kVac5) Time of applied voltage: 10 sec.maximum.NOTE: Apply voltage at a rate ofapproximately 2kV per second untilVapp is reached. Decrease at thesame rate.Fig. 53 Typical Test SetupiFig. 54 Voltage Vs. Internal Vacuum Pressure |
Related manuals for Toshiba HVK Series
Product
Learn More
Legal
Copyright © 2024 OneStart. All Rights Reserved