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PTL Power Supply |
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| with resistive loads and inductive loads as Test Power Supply
for testing the breaking capacity and the behaviour during normal use of
switches resp. of plugs or socket-outlets for household and similar purpose
with resistive-load rated currents up to 16 A, for tests with alternating
voltages, |
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| according to |
IEC 60669-1 |
:2007-01 § 18 and § 19.1, |
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IEC 60884-1 |
2006-07 § 20 and § 21, |
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| however not for tests with direct current and with direct
voltage. |
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| Information N 03 |
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| Fundamental design |
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| A power supply consists of the power unit which provides the
adjustable test voltage, as well as the resistive load units and the
inductive load units. |
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| Operation as agreed |
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| The power supply is primarily designed for |
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| ● |
testing the breaking
capacity and |
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| ● |
testing the behaviour
during normal use |
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| for operation together with PTL Actuating Units of the series F
55. For this, both components are connected by means of a connecting lead
with multiple connector. By this a reciprocal cut off of the components is
ensured, in normal test duty as well as in case of fault, caused by the
specimen or by one of the components. |
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| It is possible to operate the specimen manually or to connect an
other than a PTL Actuating Unit, but then, a cut off of the test voltage at
the specimen is not ensured, and thus safety of staff is endangered. |
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| Further employment |
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| Further possible applications may be considered. For example
checking electric lines and fuses is possible. Or an other than a PTL
Actuating Unit can be connected. |
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| The resistive and the inductive load units are floating.
Therefore, they can be employed arbitrarily and also independently of the
main transformer. |
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| Design: |
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| Trestle of rigid steel tubes with feet, suitable for
transportation by forklift, slide bars for the slide-in modules, bottom, side
walls and rear wall covered by steel sheets, lower part of the rear with
intake opening(s), top with exhaust opening(s), both prepared for mounting
air ducts, slide-in modules of rigid steel bars, front panels of anodized
aluminium, steel parts structure varnished papyrus-white with stone-grey
highlights. |
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| For connection to three-phase 3 x 400 V / PE 50 Hz, mains
connection cable with plug and inclusive fitting socket-outlet for wall
fastening. |
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| Available models: |
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| One phase model, suitable for testing one single phase specimen
(see top Fig.): |
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| Power Supply 23, |
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| 1 x 20A, 275V AC, cos φ 1 - 0.3 ind., |
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Article No.: |
N 03.23 |
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| Three phase model, suitable for testing up to three single phase
specimens or for testing one three-phase specimen (see second Fig.): |
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| Power Supply 43, |
3 x 20A, 275V AC, cos
φ 1 - 0.3 ind., |
Article No.: |
N 03.43 |
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| Abmessungen und
Gewichte: |
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| Article No.: |
Dimensions (width x depth x height in mm) |
Net weight |
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| N 03.23 |
620 x 850 x 1 920 |
350 kg |
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| N 03.43 |
1 760 x 850 x 1 920 |
995 kg |
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| Description N 03 |
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| Slide-in modules |
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| The individual components are accommodated in slide-in modules: |
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| ● |
In the bottom
slide-in module the A.C. power unit, |
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| ● |
in the middle
slide-in module the inductive load unit, |
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| ● |
in the top slide-in
module the resistive load unit. |
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| The slide-in modules can be pulled out like a drawer. To prevent
that the leads are stretched or that the slide-in modules will tip over,
there are stops that can be fold back. |
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| A. C. power unit |
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| The
A. C. power unit in the bottom slide-in module consists essentially of the
main transformer. |
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| The
main transformer is primarily operated with the mains voltage. The secondary
voltage is switchable by three rotary switches in coarse, medium and fine
steps. |
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| The main switch with pilot lamp(s) indicating the presence of
mains voltage and an industrial multiple connector are in the bottom slide-in
module, too. The connector is prepared for connection of switch or coupler
actuating units. Four fuses serve as automatic cut-out for the control
transformer, the control unit, the main transformer and the test circuit. |
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| Data of the A. C.
power unit |
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| Design
of the main transformer |
single phase dry transformer |
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| wiring
of the windings |
4 separate windings |
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| primary
voltage and frequency |
400 V, 50 Hz, without N |
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| secondary
voltage and power |
0 up to 300 V, approx. 7.5 kVA |
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| setting
of the secondary voltage |
3 rotary switches coarse, medium, fine |
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| permissible
secondary current |
25 A at 50% duty ratio (cyclic duration
factor) |
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| continuous
operation |
only allowed during sufficient ventilation |
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| electronic
overload release |
at approx. 28 A |
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| Front panel view: |
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| Resistive load unit |
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| The resistive load unit serves for setting the test current. It
consisting of heating grids, built into a duct in the top slide-in module.
They can be switched by three rotary switches in coarse, me-dium and fine
steps in any desired combination. The sum of the setting values on the rotary
switches is equal to the current flowing through the specimen at 250 V and
cos φ = 1. The resistive load unit is floating. |
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| An axial flow fan serves for cooling the grids. It is monitored
by a difference pressure switch. |
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| Data of the
resistive load unit |
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| Design
of the resistive load unit |
Heizgitter in quadratischem Schacht |
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| wiring
of the heating grids |
Parallelschaltung |
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| setting
of the test current |
3 Drehschalter, grob, mittel, fein |
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| setting
range of resistive load unit |
0,1 bis 25 A in Stufen von 0,1 A |
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| permissible
test current |
25 A at 50% duty ratio (cyclic duration
factor) |
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| continuous
operation |
only allowed during sufficient ventilation |
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| electronic
overvoltage release |
at approx. 285 V |
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| Multifunctional
Power Meter |
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| The measuring instrument A2000 acquires voltages, current,
frequency and phase displacement. It calculates active, reactive and apparent
power, active and reactive energy, as well as the power factor for the
individual phases based upon these values. |
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| Factory settings for the indications: |
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| Test
Voltage in V |
Phase |
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| Test
Current in A |
Frequency in Hz |
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| Power
Factor cos φ (inductive) |
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| With the setting buttons these indications can be changed:
Selection of phase, of measured quantities, display of maximum and averaged
values. |
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| Inductive load unit |
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| The inductive load unit is constituted by a fine step air-core
inductor. It is switched over by means of three rotary switches in coarse,
medium and fine steps. The three rotary switches may be set in any desired
combination. The sum of the settings is corresponding to the inductivity. |
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| In
accordance with the test specifications the inductor has shunt resistors with
a relatively high resistance, so that only about 1 % of the current flows
through the shunt resistors. |
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| The
inductive load units are floating. |
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| Data of the
inductive load unit |
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| Design
of the fine step air-core inductor |
3 separate windings of copper wire |
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| wiring
of these 3 windings |
connected in series |
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| internal
switching over of each winding |
by step switches |
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| setting
of the inductance |
3 rotary switches coarse, medium, fine |
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| permissible
current |
25 A at 50% duty ratio (cyclic duration
factor) |
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| continuous
operation |
only allowed during sufficient ventilation |
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| auxiliary
resistors, shunted |
for approx. 1 % of the inductor current |
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| electronic
overvoltage release |
at approx. 275 V |
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| Front panel view |
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| Cooling |
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| A fan is mounted at the lower end of the duct accommodating the
heating grids. It presses the cooling air through the heating grids. It draws
off the air from the internal and external surfaces of the inductor and the
air heated by the main transformer as well. |
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| The cooling air is drawn across the intake openings from the
laboratory room. An air filter serves to prevent pollution of the components
built in. The exhaust air is blown out upwards across a square exhaust
opening. |
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| If the air should be drawn in from outside and / or if the warm
exhaust air gets annoying in the laboratory, intake and exhaust ducts are to
be mounted. The ducts should have sufficient cross section in order to keep
the air resistance low. The existing tapped holes can be used for
flange-mounting. |
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| Monitoring elements |
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| A difference pressure switch monitors the pressure drop in the
duct accommodating the heating grids. If the fan fails or if the flow of air
is throttled inadmissibly, the unit is switched off by the master contactor. |
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| Additional monitoring elements serve to guard against damage by
overload for |
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| ● |
the Resistive load
unit, |
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| ● |
the Inductive load
unit, |
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| ● |
the A.C. power unit. |
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| In case of excess voltage or over-current an electronic excess
voltage resp. over-current release responds, the unit is switched off by the
master contactor. |
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| PTL Power Supplies
for higher test currents |
on request |
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| PTL Fluorescent
Lamp Equivalent Accessories |
on request |
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| PTL Actuating Units
for switches and socket outlets |
see F 55.10 and F 55.30 |
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Click here for ► |
prospectus as PDF |
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| N03033e009 |
2010-05-07 |
© 2010 PTL Dr. Grabenhorst GmbH, Stadtsteinach,
GERMANY |
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