ISO 27027:2008
(Main)Aerospace — Solid-state remote power controllers — General performance requirements
Aerospace — Solid-state remote power controllers — General performance requirements
ISO 27027:2008 specifies the definitions, general performance requirements and test methods to determine the performance of solid-state (remote) power controllers (SSPC) for use in aerospace electrical power systems. The solid-state (remote) power controller consists of solid-state switching device(s) and associated solid-state circuitry for protection, action of control signals and providing status information.
Aéronautique et espace — Contacteurs-disjoncteurs statiques commandés à distance — Exigences générales de performance
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 27027
First edition
2008-05-01
Aerospace — Solid-state remote power
controllers — General performance
requirements
Aéronautique et espace — Contacteurs-disjoncteurs statiques
commandés à distance — Exigences générales de performance
Reference number
ISO 27027:2008(E)
©
ISO 2008
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ISO 27027:2008(E)
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ISO 27027:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Requirements . 3
5 Quality assurance provisions. 5
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ISO 27027:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 27027 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee
SC 1, Aerospace electrical requirements.
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ISO 27027:2008(E)
Introduction
This International Standard is intended to standardize the requirements for solid-state (remote) power
controllers (SSPC) that are physically and environmentally diversified, and to provide the applicable standard
document for various solid-state (remote) power controllers.
The solid-state (remote) power controller
⎯ consists of a solid-state switching device and its driver circuit;
⎯ turns on/off the power output by receiving the control signal;
⎯ detects the over current into the load and limits or trips the current;
⎯ indicates the on/off status of the power output.
This International Standard contains definitions of the technical term, electrical requirements and test methods.
For the purposes of this International Standard, requirements such as physical, environmental and individual
items are specified in accordance with the detailed requirements that are issued individually.
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INTERNATIONAL STANDARD ISO 27027:2008(E)
Aerospace — Solid-state remote power controllers — General
performance requirements
1 Scope
This International Standard specifies the definitions, general performance requirements and test methods to
determine the performance of solid-state (remote) power controllers (SSPC) for use in aerospace electrical
power systems.
The solid-state (remote) power controller consists of solid-state switching device(s) and associated solid-state
circuitry for protection, action of control signals and providing status information.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 1540, Aerospace — Characteristics of aircraft electrical systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply
3.1
turn-on time
〈d.c. devices and non-zero crossing turn-on a.c. devices〉 time interval between initiation of turn-on signal and
the time when the output reaches 90 % of its steady-state ON value, as shown in Figure 1 a)
3.2
turn-on time
〈a.c. devices with zero-crossing turn-on〉 time interval between initiation of turn-on signal and the time when
the output switch is ON at zero crossing, as shown in Figure 1 b)
3.3
turn-off time
〈d.c. devices and non-zero crossing turn-off a.c. devices〉 time interval between initiation of turn-off signal and
the time when the output reaches 10 % of its steady-state ON value, as shown in Figure 1 a)
3.4
turn-off time
〈a.c. devices with zero-crossing turn-off〉 time interval between initiation of turn-off signal and the time when
the output switch is OFF at zero crossing, as shown in Figure 1 b)
3.5
turn-on signal
control signal level at which the power controller is turned ON
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ISO 27027:2008(E)
3.6
turn-off signal
control signal level at which the power controller is turned OFF
3.7
load voltage rise and fall time
〈d.c. devices and non-zero crossing turn-off a.c. devices〉 time interval between 10 % and 90 % of the steady
state load voltage value, as shown in Figure 1 a)
3.8
soft on/off
function for the power output current to increase linearly with turn-on signal and to decrease linearly with turn-
off signal
3.9
supply voltage
voltage applied between the power input terminal of the SSPC and the power ground
3.10
load voltage
voltage between the power output terminal of the SSPC and the power ground
3.11
voltage drop
voltage across load and line terminals of the SSPC in the ON state at the specified load
3.12
power dissipation
power dissipation which includes all power dissipated in the power switching circuit, power losses due to
internal leakage currents, and power supplies
NOTE When SSPC is OFF, the power dissipation includes only dissipation due to leakage currents and internal
power supplies.
3.13
trip
automatic reversion to the OFF state of the SSPC output caused by an over load condition
3.14
trip free
feature which will prevent subsequent re-closing unless preceded by a reset signal, when the SSPC has
tripped due to an over current condition
3.15
trip time
time interval between the application of an over current condition and the 10 % value of rated output current
NOTE In general, the higher the over current condition, the shorter the trip time.
3.16
trip curve
curve which sets the minimum and maximum trip points of the SSPC and which is plotted as current versus
time
3.17
reset
restoration of the tripped SSPC to a state from which it can be turned ON
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ISO 27027:2008(E)
3.18
on state
condition which, with the turn-on signal applied, the device allows power to be passed to the load
3.19
off state
condition which, with the turn-off signal applied, the device prevents power from being passed to the load
3.20
short circuit
circuit with impedance of less than 1 mΩ applied between the output terminal and ground
3.21
current limiting
function to limit the power output current to the required level within required time from overload or short circuit
conditions, as shown in Figure 2
3.22
peak let-through current
peak value of the current at maximum system voltage that the SSPC will conduct for a specified time interval
without damage
3.23
zero voltage turn-on/zero current turn-off
〈a.c. devices〉 characteristic that requires the SSPC to turn ON and turn OFF only at the half-cycle zero-
crossing point, regardless of when the control signal is applied or removed
3.24
reverse current
current into the load terminal of the SSPC from the load energy source
4 Requirements
4.1 Detailed requirements
The individual item requirements shall be specified in accordance with the detailed requirements that are
issued individually.
4.2 Electrical characteristics
When tested as specified in 5.1, the SSPC shall operate with supply voltage variations in accordance with
ISO 1540 or the detailed requirements. The SSPC shall be capable of controlling all types of loads as required
by the detailed requirements.
4.3 Performance
4.3.1 Control signals
When tested as specified in 5.2, the control signals shall be as specified in the detailed requirements.
4.3.2 Turn-on and turn-off time
When tested as specified in 5.3, the turn-on and turn-off time shall be as specified in the detailed requirements.
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ISO 27027:2008(E)
4.3.3 Load voltage rise and fall time (soft on/off function)
When tested as specified in 5.4, the rise and fall time as the soft on/off function shall be as specified in the
detailed requirements.
4.3.4 Isolation
The control/power isolation test voltage shall be as s
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