Environmental Engineering Reference
In-Depth Information
Required immunity to disturbances is provided
in the process of design of I&C systems, develop-
ment, manufacturing and mounting of peripheral
equipment and SHC and is kept during operation
due to creation and support of a proper electro-
magnetic environment in places of their location.
Immunity to disturbances is standardized by
determination of parameters of test influences,
simulating disturbances of each type and also
places of their application and ways of brining
test influences, at which tested peripheral equip-
ment and SHC should operate properly. Places of
application of test influences, simulating distur-
bances, are terminal screw, clamps, connectors
and other device constructive elements, defining
its physical borders with environment (further -
ports, see Figure 5):
•
Output Port:
In places of connection of
two or more wires to a device, connecting
it with one output receiver.
•
Communication Port:
In places of device
connection to one communication channel
or one local network.
•
Ground Port:
In places of device connec-
tion to a system of protective or, if avail-
able, - signal ground (signal ground port
is determined as a place, in which isolated
from the shell of input, output and/or com-
munication circuits are gathered for con-
nection to the ground major node).
•
Enclosure Port:
On outer surface of de-
vice enclosure and nonconductive ele-
ments connected with and on screens of
external cables electrically connected with
a shell.
•
Power Port:
In places of connection of
two or more wires from one power source
to a device.
For estimation of immunity to electromagnetic
disturbances tests are executed, during which
peripheral equipment and operating stand-alone
component parts of SHC are put under test in-
fluences, simulating actions of disturbances of
•
Input Port:
In places of connection of two
or more wires from one or several intercon-
nected sources of input signals to a device.
Figure 5. Places of application of test influences, simulating disturbances
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