Toshiba HV6CS-MU Vacuum Check, Location Inspection Criteria Disposition Remarks Method

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 5
	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 to		operates		operate, check
		when		operate the		smoothly.		the cause and
		electricity is		circuit.				repair.
		supplied
		Terminals		Visual		Make sure		Repair if	See Table 5
		loose or		inspection.		terminals are not		disconnected.	for
		disconnected		Tighten using a		loose or		Tighten if loose	tightening
				screwdriver.		disconnected.			torque.
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.

5.5 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:

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