TD424B Vacuum Interrupter

Vacuum Interrupter


VITD 24/1250-20B

ELECTRICAL RATINGS(3PHASE) SYMMETRICAL BASIS
1.Rated Frequency	50/60Hz
2.Rated Maximum Line to Line Voltage	24kV,r.m.s
3.Rated Power Frequency Withstand Voltage:Air	65/79kV,r.m.s
4.Rated Impulse Withstand Voltage:Air	125/145kV,Peak
5.Rated Normal Current	1250A
6.Rated Short-Circuit Current(3Phase Symmetrical Basis)	20kA,r.m.s
7.Percentage D.C. Component of Rated S.C. Breaking Current	50%
8.Rated Short-Circuit Making Current	50kA,Peak
9.Rated Duration of Short Time Current	4s
10.Rated Short-Time Withstand Current	20kA,r.m.s
11.Rated Peak Withstand Current	50kA,r.m.s
12.*Maximum Contact Resistance at Minimum Closing Force	18Micro ohms
13.*Rated Breaking Current of Single Capacitor Bank	630A,r.m.s
14.*Rated Breaking Current of Back-to-Back Capacitor Bank	400A,r.m.s
15.Rated operating sequence	o-0.3s-co-180s-co
MECHANICAL DATA
1.Interrupter Weight(Approx.)	3.11kg
2.Moving Part Weight(Approx.)	1.08kg
3.Closing Force due to Bellow and Atmospheric	12050N
4.Force Required to Hold Contacts open at Full Stroke	19060N
MECHANICAL REQUIREMENTS(REF. VCB)
1.Contact Stroke	131 mm
2.Opening Speed(average of 75 contact gap)	1.50.2m/Sec
3.Maximum Overtravel During Opening	2mm
4.Maximun Rebound During Opening	2mm
5.Closing Speed(average of last 30% contact gap)	0.90.2m/Sec
6.Maximum Contact Bounse Duration(with maximum 2 bounces)	2ms
7.Rated Contact Compressive Force	2000200N
8.Closing and Opening non-simultaneity of three-phase Contacts	2ms
LIFE (ESTIMATED)
1.Electrical Life at Rated Normal Current	50,000Operations
2.Electrical Life at Rated Short Circuit Current	100Operations
3.Mechanical Life	50,000Operations
4.Contact Erosion Limit	3mm
5.Shelf Life	20Years
1.Meets or exceeds the electrical endurance requirements of class E2 for autoreclosing duty per IEC 62271-200 and JB 8738-2008. 2.* Rated Characteristics to be given on request

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