BC - 108

BELT CONVEYOR - 108

ITEM	BC - 108
PANEL NUMBER	11F - C
PANEL. SIDE	PMCC - 1
JB SIDE	CRUSHER HOUSE
TYPE	ACB
KW	160
HP	215
FUSE RATING	ACB
POLE	4
VOLTAGE	415
F1. AMP	260
RPM	1490
SFU RATING	800A
FRAME	ND315L
BEARING DESIGN	6319C3
FLC	260

 

Electrical ACB Breaker

ACB (Air Circuit Breaker) is an electrical switching device that provides protection against short circuits and overloads in an electrical system. It is commonly used in industrial and commercial applications to control and distribute electrical power. It is capable of interrupting current flow in the event of an overload or short circuit, preventing potential damage to electrical equipment and ensuring the safety of the electrical system.

Working Principle

ACB operates based on the principle of thermal-magnetic protection. It consists of a trip unit that detects the current passing through the breaker. When the current exceeds the predetermined threshold, the trip unit activates the opening mechanism, disconnecting the circuit.

Features

• Overload Protection: ACB can detect and protect against excessive current flowing through the electrical system, preventing damage to the equipment and wiring.
• Short Circuit Protection: In case of a short circuit, ACB reacts quickly to interrupt the current flow, minimizing the risk of electrical fires and equipment damage.
• Adjustable Trip Settings: ACB offers adjustable trip settings for both overload and short circuit protection, allowing customization based on the specific requirements of the electrical system.
• Remote Control Capability: Some ACBs are equipped with remote control features, enabling operators to monitor and control the breaker remotely.
• High Breaking Capacity: ACB is designed to handle high fault currents and has a high breaking capacity to interrupt the current safely.

Maintenance and Testing

Regular maintenance and testing of ACBs are essential to ensure their proper functioning and reliability. Some common maintenance tasks include cleaning, lubrication, and inspection of contacts, trip units, and mechanical parts. Periodic testing, such as trip testing and insulation resistance testing, should also be performed to verify the breaker's performance.

ACBs play a crucial role in electrical system protection, providing safety and reliability. Proper installation, maintenance, and adherence to safety guidelines are essential for the effective operation of ACBs.

Activity prior to the outage

• Review of ACB Tripping history
• Perform visual inspection.
• Measure Temperature using Non Contact Infrance Thermometer.
• Indentify material required during Maintenance

Operating condition of ACB

• High humidity & high ambient temp.
• Frequent switching operations
• Dusty & dirty atmosphere
• Corrosive atmosphere
• Older equipment
• Frequent fault operations
• Frequent racking operations

Activity during the outage:

• Trip the Circuit Breaker
• Follow "lockout tagout" Process
• Check mechanical and Electrical operation
• Perform Inspections and cleaning
• Breaker
• SIC contacts
• Arc Chute
• Jaw
• Cradle
• Cradle contacts
• Main contacts
• Clean pole assembly and Mechanism
• Apply Balmerol Moly Grease (Black) to moving parts of mechanism
• Apply Lithon (yellow) grease to bearing components,
• Apply Licom grease law contacts
• Replace split pin of main spring (In case of EDO/EF ACB)
• Use new wire circlips, pin for UV, facia, retainer, washer wherever required,
• Maintain the arcing contact gap.
• Check simultaneously closing of all pole with pale slow closing test method.
• Gap between trip and roller (0.2 mm min)
• Perform Release Function test with Secondary injection Kit. (In case of electronic release).
• Test functionalities of accessories if any.
• Check tightness of joint
• Affix Maintenance Sticker on ACB

Activity after the outage :

• Energize switchgear and verify normal operation
• Remove Signs,
• Prepare a report of maintenance and test results.

Content of the Service Kit :

1. Self Carbon check list.
2. Cloth for cleaning (Chese Cloth)
3. Cloth for Cleaning Contact
4. Scruber (Sctoch Brite)
5. Hand gloves
6. Wire Cerclip 4,5,6 Mm
7. Lithon Yellow Grease
8. Spring for trip latch Assembly
9. Pin UV/EA/SR release link
10. Balmerol Moly ML grease(black)
11. Lycom grease for jaw contact
12. Facia retainer washers
13. Maintenance Label
14. Check List
15. CRC Spray
16. Split pin of main Spring
17. Champion set, Plain multitype Screw Driver
18. Same as - "D,Ring and T Pana - (6/7,8/9,10/11,12/13)
19. Pillar Gauge for Breaker pole adjustment.
20. Noise pliers and combinations pliers.
21. Cotton for cleaning.

DRAWING 

SHORTCUT TRICK

PROBLEM	SHORTCUT for BYPASS
24V DC COMMON SUPPLY	X - 20
EM STOP	X - 20 to X1 - 1
REMOTE	X - 20 to X1 - 2
LEFT SIDE PULLCARD	X - 20 to X1 - 3
RIGHT SIDE PULLCARD	X - 20 to X1 - 4
LEFT SIDE BELTSWAY	X - 20 to X1 - 5
RIGHT SIDE BELTSWAY	X - 20 to X1 - 6
ZERO SPEED SWITCH	X - 20 to X1 - 7
CONTROL SUPPLY FAILURE	X - 20 to X - 22
FEEDBACK	X - 20 to X - 23
FAULT	X - 20 to X - 25

PROBLEM WITH SOLUTION -

AUTOTRIP  circuit not healthy and EM STOP not working properly..

1. Problem coming before 13th August 2k24.
2. According to the control circuit diagram of the ACB (Air Circuit Breaker), when 220V DC supply is coming through X-3 and X-4, the auxiliary contactor K5 pickup. 
3. EM.Stop and Pullcard Switch stay between X-3 and X-4. 
4. According to the circuit, when EM STOP operates the K5 auxiliary contactor, it does not pickup but just half-cup pickup, so EM STOP does not work properly or overload,AUTOTRIP indication circuit not healthy.
5. Again off the control supply and check continuity individual earth to X - 3 and X - 4 and continuity show both the terminal.
6. Finally, one number of wires touched ground at LCS EM STOP. After removing the wire, the AUTOTRIP circuit was healthy.
7. Again one number of Emergency STOP P.B fixed in Parallel across head end tailend EM.Stop P.B.