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| 型號(hào)： | P-8631 |
| 元件分類： | 自藕變壓器 |
| 英文描述： | AUTO TRANSFORMER |
| 文件頁(yè)數(shù)： | 2/2頁(yè) |
| 文件大小： | 49K |
| 代理商： | P-8631 |
70
A U T O / I S O L A T I O N T R A N S F O R M E R S
White-Rodgers Emerson Electric Co.
9797 Reavis Road St. Louis, MO 63123
(314) 865-8799 Fax (314) 638-2400
S tep-Down, S tep-Up and Is olation Trans formers
S tyle C
S tyle A
G E N E R A L I N F O R M A T I O N
Auto/ Is olation Trans formers
Isolation Transformers
have two (2) separate wndings wth an electrosta-
tic shield between themto provide complete electrical isolation fromthe source.
Auto Transformers
have one (1) wnding that is tapped to achieve spe-
cific output voltage. They provide no electrical isolation in a circuit.
Auto Transformers are typically smaller than their Isolation equivalent.
Standard length of the input and output cords:
Input Cord = 5
1
/
2
Feet mnimum
Output Cord = 8 Inches mnimum
Auto/Isolation Transformers can be used in most countries by using an
input adapter plug. See Accessories section for STANCOR’s high quality line
of International Adapter Plugs.
W H Y & W H E R E A U T O & I S O L A T I O N
T R A N S F O R M E R S A R E U S E D
Stancor’s stock Auto Transformers are connected for either step-down or
step-up applications involving line voltages of 115 or 230 Volts., 50/60 Hertz.
When isolation between the primary and secondary circuits is not necessary,
and a direct connection between themis permssible, the Auto Transformer
offers the advantages of smaller size, less weight, and lower cost.
This type of unit is generally used in applications involving American appli-
ances used abroad where our standard 115 Volt equipment must operate from
a 230 Volt source. It is also used for foreign appliances designed for 230 Volt
operation, which are to be used on our 115 Volt circuits. Our catalog items
are designed for continuous rated output on either 50 or 60 Hertz.
It is important to bear in mind that the Auto/Isolation
Transformers change only the voltage levels and do not change
the frequency from 50 to 60 Hertz or vice versa. In appliances
using synchronous motors, such as clocks or phonograph record
changers and players, the speed will be different when using them
on a frequency which differs from the frequency they were original-
ly designed. In these cases the manufacturer of the appliance
should be consulted to obtain the proper motor.
The VA rating is equivalent to a Wattage rating where a resistive load
and/or unity power factor exists. When inductive loads such as motors are
used (as in a motor driven appliance) the power factor is not unity and to be
accurate the output is expressed in VA, which is the product of the output
voltage and the output current (Amps).
When selecting one of these items for use wth an appliance which
includes a motor allowance should be made for the starting current of the
motor which is somewhat higher than the running current. This information
is generally available fromthe appliance manufacturer Information pertaining
to the AC Wattage or current required by an appliance is generally marked on
the itemby the manufacturer and should be observed. It is much better to buy
a transformer wth a larger VA rating than you wll actually need because of
larger motor starting currents and variations in the line voltage and/or fre-
quency in some locations, which could cause overheating.
Is olation Trans formers
Used where a direct connection between primary and secondary circuits is
not desired and the circuits must be isolated. This results in a larger heavier
and more costly itemfor a given power rating. However in addition to the
isolating advantages, an electrostatic shield is generally added to mnimze
capacitive coupling between primary and secondary circuits. This helps to
mnimze the transfer of unwanted power line transients and interference from
other sources connected to the power line by capacitive coupling to the sec-
ondary circuit. The standard insulation test voltage rating between wndings
and between each wnding and the core is 1,500 Volts R.M.S. This is normal-
ly sufficient for 115 and 230 Volt operation.
The VA rating should be selected for each specific application, wth
allowance for any abnormal load or environmental conditions. All catalog items
have an operating temperature of 105 Degrees C. (Designed for a 65 Degrees
C. maximumtemperature rise above a maximumambient temperature for 40
Degrees C., wth unrestricted free air ventilation.) V-A/Amps output ratings are
for continuous operation fromthe specified input voltage and frequency.
General Information
All of these items have Class “A” insulation and are rated to have a maximum
operating temperature of 105 Degrees C. These units may be used wth recti-
fiers but the formfactor as explained elsewhere in this catalog should be
observed for various combinations of rectifier circuits and types of load fol-
lowng the rectifier
These items are made wth our standard N.E.M.A. plugs and receptacles,
primarily for use in this country. However if used overseas where different
types of plugs are necessary, an adapter plug should be used or our plug
removed and a foreign plug attached to the end of the line cord.
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