Notes

Outline

ACME ELECTRIC CORP POWER DISTRIBUTION PRODUCTS DIVISION TRANSFORMER SEMINAR “BUCK-BOOST” APPLICATIONS

WHAT ARE BUCK-BOOST TRANSFORMERS? BUCK-BOOST TRANSFORMERS START OUT AS ISOLATION TRANSFORMERS WITH OUTPUTS FROM 12 TO 48 VOLTS, WHICH GET FIELD CONNECTED AS “AUTO” TRANSFORMERS TO INCREASE OR DECREASE VOLTAGE WITHIN A RANGE OF 5 TO 20 PERCENT. (ie, 208 T0 230 V) THEY DO NOT PROVIDE ISOLATION FROM THE SUPPLY BECAUSE THEY ARE “AUTO” CONNECTED.

Slide 3

BASIC PRINCIPLE CURRENT WILL FOLLOW PATH OF LEAST RESISTANCE

PRIMARY AND SECONDARY HAVE SAME CAPACITY

BOOSTING CONNECTION COIL VOLTAGES ADD

AUTO CONNECTION INCREASES KVA CAPACITY

DATA NEEDED TO SELECT BUCK-BOOST TRANSFORMER 1. SYSTEM PHASE 2. SYSTEM FREQUENCY 3. LINE VOLTAGE 4. LOAD VOLTAGE 5. LOAD KVA, AMPS OR     HORSEPOWER

SELECTION EXAMPLE #1 1. 1-PHASE 2. 60 HZ 3. LINE - 189 VOLTS 4. LOAD - 208 VOLTS 5. LOAD - 4 KVA

1-PHASE GROUP I CHART    REFER TO  1-PHASE GROUP I SELECTION CHART IN SECTION VII OF CATALOG ATD-01.

CONNECTION DIAGRAM

SELECTION EXAMPLE # 2 1.  1 - PHASE 2.  60 HZ 3.  LINE  -  208 VOLTS 4.  LOAD  -  240 VOLTS 5.  LOAD  -  60 AMPS

1-PHASE GROUP II CHART     REFER TO 1-PHASE GROUP II SELECTION CHART IN SECTION VII OF CATALOG ATD-01.

CONNECTION DIAGRAM

SELECTION EXAMPLE # 3 1.  1 - PHASE 2.  60 HZ 3.  LINE  -  240 VOLTS 4.  LOAD  -  208 VOLTS 5.  LOAD  -  14 KVA

1-PHASE GROUP II CHART     REFER TO 1-PHASE GROUP II SELECTION CHART IN SECTION VII OF CATALOG ATD-01.

CONNECTION DIAGRAM

SELECTION EXAMPLE # 4 1.  3 - PHASE 2.  60 HZ 3.  LINE - 208 VOLTS 4.  LOAD - 230 VOLTS 5.  LOAD - 80 KVA

3-PHASE GROUP I CHART     REFER TO 3-PHASE GROUP I SELECTION CHART IN SECTION VII OF CATALOG ATD-01.

Connection Diagram B-B

BUCK-BOOST SLIDE CHART        DEMONSTRATE SLIDE CHART

TYPICAL APPLICATIONS FOR BUCK-BOOST TRANSFORMERS 1.  AIR CONDITIONERS 2.  AC MOTORS 3.  PUMPS 4.  TANNING BEDS 5.  CONTROL CIRCUITS

GENERAL APPLICATION COMPARISON STANDARD ISOLATION TRANSFORMER Handle large increases or decreases in voltage Provide electrical isolation and shielding if required BUCK-BOOST TRANSFORMERS Handle small increases or decreases in voltage (+/- 5 to 20%) Do not provide electrical isolation (because they are “auto” connected)

EFFECT OF LOW VOLTAGE ON MOTOR OPERATION VOLTAGE CURRENT     TEMPERATURE - 5 %      + 5 %      + 11 % - 10 %      + 11 %      + 23 % - 15 %      + 17 %      + 38 %

OTHER EFFECTS OF LOW VOLTAGE ON MOTORS DETERIORATE INSULATION NUISANCE TRIPPING OF BREAKERS INSUFFICIENT MOTOR TORQUE WASTED ENERGY AND MONEY

EFFECTS OF LOW VOLTAGE ON MOTOR TORQUE     % RATED VOLTS         % RATED TORQUE        100%        100%       90%          81%       80%          64%

CAUSES OF VOLTAGE MISMATCH SERVICE VOLTAGE CHANGED AFTER EQUIPMENT INSTALLED VOLTAGE DROP IN POWER LINE ERRORS IN ORDERING EQUIPMENT UTILITY CUTBACK IN SOURCE VOLTAGE

GENERAL SIZE COMPARISON STANDARD ISOLATION TRANSFORMER 16”H X 14”W X 11”D           125 LBS     1O KVA RATING BUCK-BOOST TRANSFORMER     10”H X 6”W X 5”D                24 LBS      1 KVA RATING

ACME BUCK-BOOST FEATURES UL LISTED/CSA CERTIFIED UL 3R ENCLOSURES ALLOWABLE UNDER NEC EPOXY ENCAPSULATED (EXCEPT 50, 100, 150 VA) BROAD RANGE OF VOLTAGES TEN YEAR WARRANTY