AIR CIRCUIT BREAKERS - Electrical and Electronics Division

12
Series 16 � 20 �
Type MD ��
12/3
TECHNICAL DATA
MD Type Capacitor unit ��/APP/ALL-PP Capacitor unit
Standards IS 2834-1986 / IS 13585-1994 IS 2834-1986 / IS 13585-1994
Rated voltage 415/440 V (Other ratings on request) 415/440 V (Other ratings on request)
Overvoltage Un Continuous Un Continuous
Un + 15% (up to 12 hours daily) Un + 15% (up to 12 hours daily)
Un + 20% (up to 30 minutes daily) Un + 20% (up to 30 minutes daily)
Un + 25% (up to 5 minutes daily) Un + 25% (up to 5 minutes daily)
Un + 30% (up to 1 minute) Un + 30% (up to 1 minute)
Any overvoltage>1.15 Un shall not occur Any overvoltage>1.15 Un shall not occur
more than 200 times in the Capacitor’s life more than 200 times in the Capacitor’s life
As per IS 13585 clause 6.1.1 As per IS 13585 clause 6.1.1
Overcurrent 1.43 In at 1.15 Cn combined with 1.43 In at 1.15 Cn combined with
overvoltage & presence of harmonics, overvoltage & presence of harmonics,
As per clause 6.2 of IS 13585 As per clause 6.2 of IS 13585
�requency (Hz) 50 / 60 50 / 60
No of phases Single (or) Three Single (or) Three
Capacitance tolerance -5% to 15% -5% to 10%
Test voltage, terminal / terminal 2.15 . Un 2.15 . Un
Test voltage, terminal / case
(Insulation level)
3.6 kV AC 3.6 kV AC
Peak transient overcurrent 200 x In 200 x In times rated current
Losses Total 2.5 W / kVAr 1.0 W / kVAr
Degree of protection IP 31 IP 31
Ambient temperature category -25 / D (Maximum 55 deg C) -25 / D (Maximum 55 deg C)
Maximum permissible altitude 2000m above mean sea level 2000m above mean sea level
Mounting position Vertical with terminal upwards Vertical with terminal upwards
Safety features Internal �uses Internal �uses
(Operation co-ordinated with case-rupture (Operation co-ordinated with case-rupture
characteristics to avoid bursting) characteristics to avoid bursting)
Container type M.S. Sheet Metal M.S. Sheet Metal
�inish Enamel Paint �inish Enamel Paint �inish
Dielectric Combination of Capacitor tissue paper and
bi-axially oriented Polypropylene �ilm
Bi-axially oriented hazy Polypropylene �ilm
Impregnant Non-PCB bio-degradable impregnant Non-PCB bio-degradable impregnant
Discharge Device Discharge Resistor Discharge Resistor
Electrodes High purity, annealed aluminium condensor foil High purity, annealed aluminium condensor foil