5SHY4045L0004GVC736 ABB Silicon controlled module IGCT high voltage control spare parts

Description

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In an electrical installation it is important to evaluate voltage drops from the
point of supply to the load.
The performance of a device may be impaired if supplied with a voltage different
from its rated voltage. For example:
• motors: the torque is proportional to the square of the supply voltage; therefore,
if the voltage drops, the starting torque shall also decrease, making it more
difficult to start up motors; the maximum torque shall also decrease;
• incandescent lamps: the more the voltage drops the weaker the beam
becomes and the light takes on a reddish tone;
• discharge lamps: in general, they are not very sensitive to small variations in
voltage, but in certain cases, great variation may cause them to switch off;
• electronic appliances: they are very sensitive to variations in voltage and that
is why they are fitted with stabilizers;
• electrom echanical devices: the reference Standard states that devices such
as contactors and auxiliary releases have a minimum voltage below which
their performances cannot be guaranteed. For a contactor, for example, the
holding of the contacts becomes unreliable below 85% of the rated voltage.
To limit these problems the Standards set the following limits:
• IEC 60364-5-52 “Electrical installations of buildings. Selection and erection
of electrical equipment – Wiring systems” Clause 525 states that “in the
absence of other considerations it is recommended that in practice the voltage
drop between the origin of consumer’s installation and the equipment should
not be greater than 4% of the rated voltage of the installation. Other
considerations include start-up time for motors and equipment with high inrush
current. Temporary conditions such as voltage transients and voltage variation
due to abnormal operation may be disregarded”.
• IEC 60204-1”Safety of machinery – Electrical equipment of machines – General
requirements” Clause 13.5 recommends that: “the voltage drop from the
point of supply to the load shall not exceed 5% of the rated voltage under
normal operating conditions”.
• IEC 60364-7-714 “Electrical installations of buildings – Requirements for special
installations or locations – External lighting installations” Clause 714.512
requires that “the voltage drop in normal service shall be compatible with the
conditions arising from the starting current of the lamps”.