CAPACITOR BANK CALCULATION VERSION 1 XLS

CAPACITOR BANK CALCULATION

OVERALL PREVIEW

INTRO

• CAPACITOR BANK REQUIRED TO BE PROVIDED IN THE ELECTRICAL SYSTEM TO ENSURE THAT THE POWER FACTOR WILL NOT DROP TO THE MINIMUM LEVEL THAT ALLOWED BY THE LOCAL ELECTRICITY PROVIDER.

• IF THE POWER FACTOR DROP TO MUCH THE POWER KVA WILL BE INCREASE GREATLY. THIS CAN BE CALCULATED BY THE FOLLOWING FORMULA.
  P(KVA) = P(KW)/POWER FACTOR

• CAPACITOR WAS USED TO MAINTAIN THE VOLTAGE VALUE IN THE SYSTEM AND ALSO TO MAINTAIN THE POER VAR WHICH IS IMPORTANT FOR POWER FACTOR CORRECTION AND TO AVOID LOSSES.

• MOST REDUCTION OF THE POWER FACTOR WAS DUE TO THE STARTING OF THE BIG MOTOR i.e. LIFT, PUMPS ETC. SO THE CRITICAL AREA ARE REQUIRED POWER FACTOR CORRECTOIN AND CAPACITOR BANK.

DETAIL PREVIEW

THE CALCULATION

• THE CALCULATION ABOVE WAS GENERATED TO CALCULATE THE REQUIRED CAPACITOR BANK FOR THE SYSTEM, BREAKER SIZE FOR EACH CAPACITOR BANKI IN LINE, MAIN BREAKER SIZE FOR CAPACITOR BANK AND ARRANGEMENT OF STEP FOR POWER FACTOR REGULATOR TO STEP IN AND STEP OUT.

• NOWADAY THERE ARE SEVERAL SYSTEM THAT HAS BEEN DEVELOP FOR POWER FACTOR CORRECTION STEPS ARRANGEMENT IN POWER FACTOR REGULATOR (PFR). THE DEVELOPMENT WAS DONE TO ENSUER THAT THE STEPS THAT SELECTED WAS AT THE OPTIMUM PERFORMANCE.
  

PROGRAM PREVIEW.

1. ESTIMATE MAXIMUM DEMAND - THE MAXIMUM DEMAND (MD) (LOAD) THAT CALCULATED IN THE SYSTEM THAT SEEM TO BE REQUIRED TO BE APPLIED WITH POWER FACTOR. IT CAN BE 100% MD, 70% MD OR 50% MD WHICH IS DEPENDING THE LOAD PROFILE AND APPLICATION
2. POWER FACTOR TO CORRECT - THE POWER FACTOR THAT NEED TO CORRECT. WHICH IS TO BE ASSUME THAT THE MOST CRITICAL WHERE THE POWER FACTOR CAN DROP. POWER FACTOR RANGE WAS BETWEEN 0.00 TO 1.00.
3. POWER FACTOR TO ACHIEVE - THE TARGET POWER FACTOR TO BE ACHIEVE AFTER CORRECTED. IN MALAYSIA, IF THE POWER FACTOR DROP LESS THAN 0.8 THE PENALTY WILL BE IMPOSED TO THE USER.
4. CAP BANK VALUE IN 415V - THIS JUST THE VALUE THAT CALCULATED TO SHOW THE CAPACITOR BANK VALUE AT 415V
5. CAPACITOR BANK VALUE IN 525V - THIS THE VALUE THAT NEED TO BE TAKE INTO ACCOUNT FOR THE DESIGN. THERE ARE ALSO CAPACITOR AT 440V IN THE MARKET. THE CALCULATION FOR RATING AT 440V WILL BE DEVELOP LATER.
6. CAPACITOR BANK VALUE TO BE PROPOSED - THIS VALUE IS JUST A ROUND UP FIGURE THAT OBTAINED FROM THE CAB BANK VALUE CALCULATED IN 525V, THIS VALUE ALSO NEED TO BE SAME AS VALUE IN THE FINAL RESULT (WILL BE EXPLAIN LATER)
7. CAP BANK STEP - THE STEPS THAT TO BE DESIGN FOR SELECTION OF THE POWER FACTOR REGULATOR (PFR). IT CAN BE EITHER 6 STEPS OR 12 STEPS.
8. FIRST STEP OF CAP BANK - THE FIRST CAPACITOR BANK THAT TO BE THE FIRST CAPACITOR TO BE KICKED IN FOR POWER FACTOR CORRECTION. THE SELECTION OF THIS CAPACITOR VALUE IS IMPORTANT TO ENSURE THE CAPACITOR WILL KICK IN IF IT SENSE THE POWER FACTOR DROP AT THE LOWER LOAD. IF THE FIRST CAPACITOR WAS TOO BIG, THE CAPACITOR WONT BE KICK IN UNTIL THE LOAD THAT NEED TO BE CORRECTED ACHIEVE THE SPECIFIED FIRST CAPACITOR BANK.
9. MAIN BREAKER SIZE - THE MAIN BREAKER (MCCB) SIZE THAT NEED TO BE SPECIFIED FOR THE CAPACITOR BANK WHICH THE DISCHARGING CURRENT OF THE CAPACITOR BANK CAN BE 1.5 TIME OF THE RATED CAPACITOR INSTALLED.
   OTHER FEATURES.
   
10. IN THE CALCULATION ALSO PROVIDED THE FOLLOWING

• BREAKER SIZE FOR EACH CAPACITOR BANK
• TOTAL CAPACITOR AT EACH STEP
• THE CALCULATION IS INCLUSIVE OF 25% SPARE FOR FUTURE.
  

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