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© ABB Ltd. PTMV, INDIA JULY 2004 UNISAFE PANEL WITH VD4 CIRCUIT BREAKER PRODUCT PRESENTATION
© ABB Ltd - 2 Unisafe:Indoor Metal Clad Switchgear Cubicle
© ABB Ltd - 3 UNISAFE PANEL Designed and type tested to meet requirements of IEC60298 & / IS:3427 Air insulated indoor switchgear Metal clad construction Independent exhaust vents for all HT compartments Internal arc tested IP4X degree of protection externally - IP5X available as option
© ABB Ltd - 4 UNISAFE PANEL Integral Earthing Switch optional Normal service conditions: Min ambient temp:-5 o C Max ambient temp:+40 o C Quality System Certification- ISO 9001 Environmental Management System- ISO 14001
© ABB Ltd - 5 BREAKER COMPARTMENT Test position of circuit breaker behind closed door Racking in/out of breaker from test to service position and vice-versa with cubicle door closed only Mechanical interlock to prevent racking in/out of breaker, when breaker is in closed position Live parts covered by automatic shutters when breaker is racked out
© ABB Ltd - 6 METERING COMPARTMENT Metering compartment with numerical /static /electro-magnetic relays, indicating meters, lamp and control switches Protection and measuring apparatus customized as per requirement Option of REF542 plus, composite unit for protection, measurement, control, signalling, interlock, automation and communication
© ABB Ltd - 7 CABLE AND CT COMPARTMENT Spacious construction to accommodate 1 set of CTs and 2 runs of cables Option of rear extension to accommodate extra CTs or cables Adequate height for cable termination
© ABB Ltd - 8 PT COMPARTMENT Withdrawable line PT provided in the breaker panel Removable fuses mounted on the PT Safety shutters between PT & Cable compartment close automatically on PT withdrawal
© ABB Ltd - 9 BUSBAR COMPARTMENT Spacious busbar compartment for adequate air clearances Option for busbar insulation available Option for shrouds on joints available
© ABB Ltd - 10 Construction details of Switchgear Cubicle type UNISAFE
© ABB Ltd - 11 Construction details of Switchgear Cubicle type UNISAFE
© ABB Ltd - 12 VD4 BREAKER The VD4 type circuit breaker is designed and tested to meet requirements of IEC / IS : Vacuum used as insulation and arc interruption medium Operationally safe and reliable Capable of interrupting small magnetizing and capacitive currents
© ABB Ltd - 13 VD4 BREAKER Features of operating mechanism O-C-O operation without recharging Closing spring charged by motor in less than 15secs Electrical anti-pumping Provision for manual charging Synchronisation and fast auto reclosure duty
© ABB Ltd - 14 Vacuum Interrupter 1) Stem / Terminal 2) Twist protection 3) Bellows 4) Interrupter lid 5) Shield 6) Ceramic insulator 7) Shield 8) Contacts 9) Terminal 10) Interrupter lid
© ABB Ltd - 15 Interruption principle VACUUM ARC Vacuum arc is initiated by the separation of current carrying contacts and is maintained till the current zero Two types of vacuum arc - Diffuse & Contracted DIFFUSE TYPE It occurs while interrupting the rated current Single melting points form on the entire surface of the cathode producing metal vapours which support the arc The diffuse vacuum arc is characterised by expansion over the contact surface and by an even distribution of thermal stress over the contacts surfaces. Negligible contact erosion
© ABB Ltd - 16 Interruption principle CONTRACTED TYPE Higher the interruption current, the arc tends to be transformed from the diffuse into the contracted type due to the Hall effect The arc contracts at the anode and as the current increases further it tends to become sharply defined. In this area there is an increase in temperature with consequent thermal stress on the contact.
© ABB Ltd - 17 Interruption principle SPIRAL CONTACTS To prevent overheating and contact erosion, the arc is kept rotating The special geometry of the spiral contacts generates a radial magnetic field in all the areas of the arc column An electromagnetic force is self generated and acts tangentially causing rapid arc rotation around the contact axis. The arc is forced to rotate and to involve a wider surface than that of a fixed controlled arc Apart from minimising thermal stress, contact erosion also is reduced which makes high short circuit current interruption possible. Maximum dielectric strength is restored within micro- seconds as the rapid reduction of current charge and rapid condensation of the metal vapours happens simultaneously along with the current zero.
© ABB Ltd - 18 UNISAFE CROSS SECTIONAL DWG
© ABB Ltd - 19 VD4 BREAKER DIMENSIONAL DRAWING
© ABB Ltd - 20 TECHNICAL DETAILS DescriptionUnitRating VoltagekV12 FrequencyHz50 CurrentAup to 2000 Short time withstand kA26.3 current (for 3 secs) Peak withstand currentkAp66 Insulation levelkVrms/kVp28/75, 95kVp as option WidthxDepthxHeight up to 1250A b/b currentmm600 x 1550 x 2500 above 1250A b/b currentmm750 x 1550 x 2500 Weight with breaker (approx.)kg1000 Degree of Protection-EnclosureIP4X, IP5X on request UNISAFE PANEL
© ABB Ltd - 21 TECHNICAL DETAILS DescriptionUnitRating TypeVD E E VoltagekV12 CurrentA Breaking capacitykA Short time withstand kA current (for 3 secs) Peak withstand currentkAp Insulation levelkVrms/kVp28/75 Operating sequenceO-3min-CO-3min-CO/ O-0.3secs-CO-3min-CO Weight (approx.)kg VD4 CIRCUIT BREAKER
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