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Technical Comparison

Technical Comparison. CG- Schneider. C-POWER. Type of ACB. LH. C H. Current Ratings (A). 800 – 3200. 400 – 6300. Breaking Capacity,. Icu=Ics. 50 – 80. 36.6 - 100. (kA). Short time Withstand for 1. 50 – 65. Icu=Ics=Icw. sec,. Icw (kA). (. Icw <. Ics). @. Total opening time.

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Technical Comparison

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  1. Technical Comparison CG- Schneider C-POWER Type of ACB LH C H Current Ratings (A) 800 – 3200 400 – 6300 Breaking Capacity, Icu=Ics 50 – 80 36.6 - 100 (kA) Short time Withstand for 1 50 – 65 Icu=Ics=Icw sec, Icw (kA) ( Icw < Ics) @ Total opening time 36 - 40 ms 40 ms Mechanical life (No. of 2500 20000 operations) Electrical life (No. of 500 2500* operations) @ Not true. Delays due to indirect tripping system, like tripping due to overload through shunt release, are not included : Further Explained in next few slides. * Extendable up to mechanical life by replacing the arcing contacts

  2. Apart from normal currents, an ACB is supposed to make (Icm), break (Ics, Icu) & carry (Icw) definite abnormal currents. Selectivity of an ACB is defined by Ics, Icu, Icw & withstand time for Icw. In a system where discrimination is a requirement, selection is limited to current whichever is lowest among Ics, Icu & Icw. For e.g. ACB with Icu=65kA & Icw for 1 sec = 50kA can be selected only for a system of fault level lesser than 50 kA. It can’t be selected upto the Icu level of 65 kA. Customers generally don’t realise this because of projection of only Icu or Ics as breaking capacity by the suppliers & also because actual occurrence of faults is rare. Selectivity

  3. C-Power ACB Complete Selectivity upto the full short circuit breaking capacity Reason : Ics=Icu=Icw Short time withstand rating equal to the S.C. breaking capacity LH ACB Partially selective Reason : Icw<Ics Short Time Withstand rating of 1600A to 3200A is less than the S.C. Breaking Capacity. Selectivity

  4. C-Power ACB Easily Replaceable arcing contacts. Does not require a skilled technician. Arcing contacts easily available as spares. With this unique design of contacts, the electrical life of ACB, i.e. 2500 operations, can be extended to mechanical life i.e. 20,000 operations. LH ACB The arcing contacts are not designed to be of replaceable type as the contact assembly involves a compression spring, which can’t be removed & reassembled at site. With this drawback, the maximum electrical life of the ACB can be 500 operations only. Maintainability

  5. C-POWER ACB 1600A, 3 Pole, D/O W : 399 mm H : 468 mm D : 524 mm LH ACB 1600A, 3 Pole, D/O W : 460 mm H : 480 mm D : 608 mm Comparision of Volume with C-POWER - 37% oversize Size

  6. C-Power ACB Designed to have higher inter-phase clearance for safety even with more compactness in the ACBs. LH ACB Though ACBs are Oversized the inter-phase clearance is lesser. This makes necessary for safety & quality conscious customers to use additional phase barriers. However, Price driven customers may compromise for safety. Link Termination: Inter-phase Clearance • C-POWER (mm) LH (mm) • 800/1000 A 52 40 • 1250A 39 40 • 1600 A 39 30 • 2000 A 54 30 • 2500/3200 A 48 40

  7. C-Power ACB Higher no. of holes in terminals to give low joint resistance & hence result in low temperature rise : LH ACB Lesser no. of holes in terminals will lead to poor joint & hence abnormal temperature rise : Link Termination : Termination Holes • C-POWER LH • 800 to 1250 A 4 2 • 1600 A 4 2 • 2000 A 6 2 • 2500 A 6 4 • 3200 A 6 4

  8. C-Power ACB Holes are placed on the terminal in a skewed fashion to give a strong & adequate joint. LH ACB For ratings 1600A & 2000A, terminal holes lie in a straight line. This is likely to give rise to line contact between links & terminal and hence abnormal temperature rise C-POWER 800 to 1250A 1600A 2000A 2500A 3200A LH Will lead to poor joint Link Termination : Overlap Surface

  9. C-Power ACB Telescopic Racking handle accessible from front. The release settings are accessible from the front. No need to open the panel door to access the above. LH ACB Racking handle located at the side of the cradle. Not a safe and convenient practice. The protection releases and relays are not accessible with the door closed. Opening of panel door is a must to access the above which defeats the purpose of door interlock. User Friendly Features

  10. C-Power ACB Easy removal of arc chutes for inspection of contacts. Reason : Spring loaded latch to be turned LH ACB Difficult to remove the arc chute in panel compartment. The ACB has to be removed from the panel for the above purpose. Reason : Requires a screwdriver to remove two screws User Friendly Features

  11. C-Power ACB Manual ACBs require only single stroke of handle to close. LH ACB Manual ACBs require multiple strokes of handle to charge the closing spring and then subsequently closing the ACB through “Close” push button. User Friendly Features

  12. C-Power ACB Wide range of Releases for comprehensive protection Thermo-magnetic : DN1 Solid State : SR15, SR15G Microprocessor based : SR21, SR21E Computer compatible : SR61C Separate fault indication available with all releases LH ACB Use overload relay for thermal protection Direct acting magnetic release for S/C protection Solid State relays available: CSR1 - Overload & Short circuit protection CSR IIA & CSR III - Overload, short circuit & ground fault protection Separate fault indication not available with electronic relays. Over-current Protection Devices

  13. C-Power ACB More no. of I-t characteristics in SR releases 10 characteristics in thermal zone in SR21/21E. Short Circuit Pick-up : 2 - 10 In for SR15/15G 2 to 16 In for SR21/21E Separate Inst. Zone protection in SR21/21E LH ACB Less no. of I-t characteristics in CSR relays 6 I-t characteristics in thermal zone Short Circuit Pick-up : 2 to 8 In Can either have short circuit protection with time delay or Instantaneous tripping. Over-current Protection Devices

  14. C-Power ACB Direct acting Releases (SR15/SR15G/SR21/SR61C) More reliable Releases do not require auxiliary supply for operation. LH ACB Relay (CSR series) does not act directly on the trip shaft. Relay ---->Trip Coil ---->Trip Shaft Less reliable The minimum impulsion time is far more than C-Power ACB because of indirect tripping here. The trip coil requires auxiliary supply. OVER LOAD PROTECTIONby Electronic Devices

  15. C-Power ACB Direct acting DN Release for all ratings. More reliable LH ACB Overload protection offered by thermal overload relay Relay does not act directly on the trip shaft. Relay ----->Shunt or U/V release ----->Trip Shaft Less reliable & increases fault clearing time OVERLOAD PROTECTIONby Thermomagnetic Devices

  16. C-Power ACB Low Operating Time : 25ms In built time discrimination in case of DN2 release. Release does not require auxiliary supply for its operation. LH ACB Higher Operating time - up to 40ms Time discrimination requires additional “RS” unit. Relay---> Microswitch----> RS unit----> Tripping Coil RS unit requires auxiliary supply for its operation SHORT CIRCUIT PROTECTION -by Thermomagnetic Devices

  17. C-Power ACB Direct acting EF release Current operated - Doesn’t require auxiliary supply LH ACB Relay used for EF protection Relay does not act directly on the trip shaft. Relay ---->Shunt Release ---->Trip Shaft Less reliable. Requires auxiliary supply of 415V a.c. EARTH FAULT PROTECTION

  18. C-Power ACB Mechanism in all ACBs are left aligned. Aesthetically superior & better space utilisation Standard cut out required on panel - Easy for tooling & assembly by Panel Builders. Bezel provided with ACB to prevent dust ingression suitable for IP54 protection. LH ACB Main facia cutout does not include cutout for ACB racking assy., position locks and position indicator. Different cutouts have to be made in the panel to suit different ratings. No protection from dust ingression is provided. Panel Mounting

  19. C-Power ACB Superior insulating material used. Conform to Glow Wire test (IEC60695). The insulating material used in vicinity of current carrying parts have very high operating temperature & may catch fire under fault conditions. Glow wire test ascertains the temperature withstanding capacity of the insulating material used. Belong to V0 category of UL94 standard. UL94 is the global standard used to ascertain self extinguishing property of insulating material. LH ACB Poor insulating material used. Don’t conform to glow wire test. ACBs don’t use self extinguishing material at all. Safety : Insulating Material

  20. C-Power ACB For e.g. Pole partition is made of Fire retardant material. No hylam components used for insulation purpose. Use epoxy moulded CTs for durability even in adverse atmospheric conditions. LH ACB For e.g. Loose hylam partition used in the pole assy. Accidental removal of these can cause a flashover. Use tape wound CTs, which do not last long for operating temperature of ACBs in a long run. Even reliability of protection releases is questionable as the releases sense the fault through such inferior CTs. Safety : Insulating Material

  21. C-Power ACB Rating error preventor provided. Feature is required when multiple ratings are given in same frame size. All Draw-out ACBs have in-built safety shutters where as they are offered as optional in Pulsar ACBs. LH ACB No rating error prevention feature though there are breakers of same frame size with different ratings. This can create a dangerous situation as there is a risk of loading wrong breaker of same frame size. For e.g. 800A breaker can be loaded where actually 1000A is required. Safety

  22. C-Power ACB Spring charging time - Max. 7 sec. Programmable SICs. Test/Service position microswitch can be avoided Broad operating voltage range in shunt releases of 10 - 130% for a.c. 65 - 130 % for d.c. LH ACB Higher Spring charging time : 8 -16 sec. No programmable SICs Operating voltage range for a.c. Shunt trip : 85 - 110% Additional RA unit required for extending the voltage range RA unit requires auxiliary supply for operation Other Features

  23. C-Power ACB In-built mechanical anti-pumping in electrical ACBs to prevent auto reclosing in case of persistant faults. No additional CTs required for earth fault protection. LH ACB Mechanical anti-pumping not provided. This may result in flash-over as the ACB will close in fault conditions after tripping once. Interposing CTs & neutral CTs are supplied loose for earth fault protection in case of static relays. The customer should ensure mounting of the same. Other Features

  24. C-Power ACB Lesser power consumption by under-voltage release as its Hold-ON VA is 10VA only. The breaker can be withdrawn to Isolated position with cubicle door in closed condition. Aux. Contacts of 6NO + 6NC as standard LH ACB Hold-ON VA of undervoltage release is 35 VA. The breaker can’t be withdrawn to Isolated position with cubicle door in closed condition. Aux. Contacts of 3NO + 3NC offered as standard Other Features

  25. C-Power ACB Breaker firmly held to cradle by bolted joints. Smooth racking LH ACB Play present when breaker is pushed in the cradle. This can lead to breakage of SICs or non insertion in extreme case. Breaker just slides on welded plates in cradle which is Unsafe. Side ways movement observed during racking operation due to misalignment of ACB jaws & cradle terminals. RELIABILITY

  26. C-Power ACB Workmanship of Highest standards Highly reliable LH ACB Workmanship extremely poor Functioning of following accessories is not reliable : Control transformer for static relays. Racking interlock RELIABILITY

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