Glossary

\% BUILD
Percentage of core window filled by thicknesses of conductor, insulation, full ducts, and clearance space.

% COIL LOSS USED IN TEMP. RISE
For multiple secondaries, a negative entry for number of secondaries will cause 2TRANS to use only the volt amperes of the first secondary in the calculation of transformer VA, primary current and temperature rise.

% DUTY CYCLE
Percent of continuous time that the transformer operates. (Continuous time is 100; one minute on, one minute off is 50.)

%EFFECTIVENESS (DUCTS)
Percent of duct free from obstruction due to leads, duct spacers, etc.

% FILL
Percentage of toroidal core opening filled with wire.

% STRAY LOSS
Enter stray losses as a percentage of total losses.

3PH5 (5)
Three-phase: three coils on five-legged core.

3PHS (6)
Three-phase: three coils on three-legged core..


AC VOLTS
RMS voltage (Line voltage if 3 phase)
(for inductors carrying both AC and DC current, enter RMS ripple voltage)

AIR FLOW RATE
Speed of air flowing past coils in linear feet per minute.

AIR GAP
Enter TOTAL air gap length if transformer has a gap. A ZERO(0) entry will cause program to consider only normal core joint effects.

AL (2)
Electrical grade aluminum with 61.8% conductivity.

AL 58% (-2)
Electrical grade aluminum grade with 58% conductivity.

ALT. DUCT ROUTINE (-3)
Alternate duct routine that considers duct surfaces, outside coil surfaces and core loss effects on the inner winding.

AMBIENT TEMP.
Temperature in degrees centigrade of room air, outside air or enclosure air in which the transformer is operating.

AVG COATING THICKNESS
Average thickness in inches of compound or encapsulant surrounding core and coil.

AW
Exciting power, entered in VA/LB.

AWG. NO.
American wire gauge number designation.

BOBBIN 9
Shell type bobbin.

BOBC
Core type using two, three-flanged bobbins.

BOBS
Shell type using three-flanged bobbin.

BR (4)
Bridge rectifier (1-phase)

BR
3-phase bridge (star)

BRC (8)
Bridge capacitive filter .

BUILD (PERCENT)
Percentage of core window dimension filled by thicknesses of conductor, full ducts, insulation, and clearance space.

BULGE FACTOR
Enter factor to account for wire bulging.
(If ZERO(0) is entered, 2TRANS will use standard bulge factor of 1.10 (10%).)

BUTT-LAPPED (1)
Core pieces are not interleaved leaving a small gap (program uses .001 gap when calculating exciting current)

C-CORE (1)
Wound cut cores

CAP
Filter capacitance in farads.

COIL SURFACE CONTACT WITH OUTER LEGS:


PARTIAL (1) OR NONE (2)
1 partial 2 none

COMPENSATION (1 or 0)
If YES (1), secondary turns adjusted to compensate for voltage drops due to internal impedance.
If NO (0), turns will NOT be adjusted.

COMPENSATION WINDING (Ferro)
Harmonic compensation (HC) winding.

COMPOUND-FILLED (4)
Solid material surrounding core-coil in an enclosure.

CONFIGURATION (Ferro)
2-COIL (2) Primary and secondary coils wound individually and separated by a magnetic shunt .

CONFIGURATION (Ferro)
3- COIL (3) Primary, secondary and harmonic coils wound individually and separated by shunts.

CORE TYPE (DESIGN TYPE) (2 /-2)
Two coils on one magnetic path.
(-2 coils in parallel)
( 2 coils are in series)

CORE BOX ADDITION: HT
Enter dimension to be added to each side of the core height for core box. (If TOROID)

CORE BOX ADDITION: ID
Enter dimension to be SUBTRACTED from each end of inside diameter for core box. (If TOROID)

CORE BOX ADDITION: O. D.
Enter dimension to be added to each end of core outside diameter for core box. (If TOROID)

CORE NAME
Enter core name or part number as identifier.

CRUC (6)
Cruciform cross-sectional core leg.
(Round core x-section)

CU (1)
Electrical grade copper, 100% conductivity.

CURRENT
RMS load current if unrectified, DC load current if rectified, LINE current if 3-phase

CURRENT WAVESHAPE
SINE WAVE (0)
SQUARE WAVE (1)
ALTERNATING
SQUARE WAVE (2)
HALF SINE WAVE (3)
RECTIFIED SINE WAVE (4)
SAW TOOTH (5)
CLIPPED SAW TOOTH (6)

D.C. CURRENT (UNBALANCE)
Enter unbalance in D.C. current.

D.C. VOLTS (UNBALANCE)
Enter unbalance in D.C. voltage.

DCR
Any external DC resistance in series with the diode. (If capacitive filter)

DELTA (1)
Three-phase windings are connected in series for a closed circuit.

DESIGN TYPE
Mechanical configuration of core and coil:

SHELL – 1 coil, 2 magnetic paths

CORE – 2 coil, 1 magnetic path

SIMPLE – 1 coil, 1 magnetic path

TOROID – ring core

3PHASE – 3 coils on 3 leg core

3PHASE, 5 LEG – 3 coils on 5 leg core)

CORE/split bobbin -core type using two 3-flange bobbins

SHELL/split bobbin -shell type using three-flange bobbin

SHELL/bobbin -shell type using two-flange bobbin

DESTRUCTION FACTOR
Destruction factor is a multiplier for Epstein core loss data. Enter as 1.05, 1.1, etc. An entry of 1 will use program default values.
(Destruction factor question appears only for strip cores grades M2, 3, 4. and for grades M5 & 6 when core is MITERED)

DG (2)
Distributed-gap core – tape wound core where the gap is distributed unevenly.

DIEL.TEST VOLTS(KV)
RMS kilovolts to be applied during test.

DIODE DROP
Net forward diode drop in volts.

DISK WINDING
Coils are wound in thin concentric disks
YES (1) if transformer is to be disk wound.

NO (2) if NOT disk wound.

DUCT EACH SIDE OF BARRIER

YES (1), a duct will be placed on each side of insulation barrier.

NO (0), the duct will be placed over the section insulation of the previous winding

DUCT LOCATION (for internal ducts)
Location of internal ducts within winding.

NONE – no ducts in winding
NUMBER OF LAYERS – A number equal to or greater than one (1) specifies the number of layers between ducts (2 indicates a duct every two layers).
NUMBER OF DUCTS – A negative entry of a whole number will give exact number of ducts. -1 gives one duct, -2 gives two ducts, -3 gives three ducts, etc. (program automatically assigns negative number)

DUCT SPACER REMOVED

NONE (0) if all spacers remain in the duct.
ALL (1) if spacers are removed from duct.
PARTIAL (2) if spacers partially remain in each winding.
RESTRICTED AIRFLOW (3) to consider restriction of air flow under core yokes (Full ducts only)

DUCT TYPE
Cooling duct configuration:
END (1) On end of coil outside core window.


FULL (2) Duct all around coil.


3-SIDED (3) Ducts on 3 sides of coil outside of core window (core-type designs only)


1-SIDED (4) Ducts on 1 side of coil (core-type designs only)


Three sided, or one sided external ducts are not permitted.

DUCT WIDTH FANNED OUT

Enter NO (0) if the width of all ducts are equal


Enter YES (1) if the width of the ducts increase as the coil build increases

DUCT %EFFECTIVENESS
Percent of duct free from obstruction due to leads, duct spacers, etc.

DUCTS NONE (0)
No ducts of any kind

DUCTS INT (2)
Internal ducts:
within windings only

DUCTS EXT (3)
External ducts:
between windings only

DUCTS BOTH (4)
Ducts both in and between windings

DUCTS UNBLANK (1 or 0)
YES (1) If all cooling surfaces of the ducts are unblanketed. (No insulation between the conductors and duct surface.)


NO (0) If insulation is between the conductors and the ducts surface.

DUCTS THICKNESS
Radial thickness of duct opening

DW (10)
Double wye rectified (three-phase only)

ELECTROSTATIC SHIELDS
Barrier or sheath used to reduce the electrostatic coupling between windings.

ENCAPSULATED (3)
Conformal coating of resins surrounding core/coil.

EXTERNAL DUCT THICKNESSES
Enter thickness of each duct in order they are to appear.

EXTERNAL DUCT TYPES
Enter style of each duct in the order in which they will appear. END(1), FULL(2)

EXTERNAL DUCTS: # OF LOCATIONS
Enter number of required duct locations.

EXTERNAL DUCTS: LOCATION
Enter number of winding UNDER which duct is to be located. (2 indicates duct under second winding, etc.)

EXTERNAL DUCTS: THICKNESS
Radial thickness in inches of duct opening.

EXTERNAL DUCTS: EFFECTIVENESS
Percent of duct free from obstruction due to leads,

EXTERNAL DUCTS: VARIABLE

NO (0) If all external ducts are the same size or type.
YES (1). If external ducts are of different size or type.

% DUTY CYCLE
Percent of continuous time that the transformer operates. (Continuous time is 100; one minute on, one minute off is 50.)