Mission Critical NEWMAR Sentinel, Руководство по установке и эксплуатации, Страница: 24 / 28

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IEC Class I
(EN Type 1)
(DIN Class B)
IEC Class II
(EN Type 2)
(DIN Class C)
IEC Class III
(EN Type 3)
(DIN Class D)
(Built in to rectifiers)
SPD = Surge Protection Device
A
PPENDIX
1 - AC I
NPUT
T
RANSIENT
P
ROTECTION
Input and output cables MUST
BE SEPARATE
i.e., do NOT run parallel
Figure A
Fig. A illustrates the surge protection installation principles, utilizing the 3 stage protection zone
concept.
The
Type 1 (SPD1) surge arrester, fitted in the installation's main incoming electrical switchboard,
is capable of diverting the energy of a direct lightning strike. This is the first stage of the electrical
network's protection. It is important that upstream Type 1 protection is provided on site. Although
the actual surge capability of the device used can vary depending on the severity of lightening in
any particular installation, the typical maximum discharge current of a Type 1 surge suppressor
will be in the order of 50kA to 100kA (10/350µs impulse)
The 10/350µs current wave as shown below is the standardized current waveform which passes
through equipment when subjected to an overvoltage due to a direct lightning strike.
E
ar
th
B
ar