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Figure 9.15.2 Surge arrester installed next to the LED mast light with the Figure 9.18.5 Source characteristic of a conventional d.c. source versus
feeder cable of the mast light being installed in open space the source characteristic of a PV generator. When switch-
for protecting the LED mast light from field-based injection ing PV sources, the source characteristic of the PV gene-
or as sole protection from conducted surges caused by rator crosses the arc voltage range. . . . . . . . . . . . . 365
distant atmospheric events and switching operations . . . 340 Figure 9.18.6 DEHNcombo YPV SCI type 1 combined arrester for
Figure 9.15.3 Combined arrester installed in the terminal compartment / protecting photovoltaic systems from surges and partial
distributor of the metal mast in conjunction with a surge lightning currents. . . . . . . . . . . . . . . . . . . . . . 366
arrester for protecting the LED mast light from nearby Figure 9.18.7 Switching phases of the three-step d.c. switching device
atmospheric events and conducted surges caused by integrated in DEHNguard M YPV SCI … (FM) . . . . . . . 366
switching operations . . . . . . . . . . . . . . . . . . . . 340 Figure 9.18.8 DEHNlimit PV 1000 V2 spark-gap-based type 1 combined
Figure 9.15.4 Earthing conductor for protecting the cable route and arrester . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
earthing the mast. . . . . . . . . . . . . . . . . . . . . . 341 Figure 9.18.9 Modular DEHNguard M YPV SCI … (FM) type 2 surge
Figure 9.15.5 Protected volume of a cable route . . . . . . . . . . . . . 341 arrester with fault-resistant Y circuit and three-step d.c.
switching device . . . . . . . . . . . . . . . . . . . . . . 367
Figure 9.16.1 Rolling sphere method . . . . . . . . . . . . . . . . . . . 344
Figure 9.18.10 Ready-to-install type 2 DEHNcube YPV SCI 1000 1M
Figure 9.16.2 Example of an air-termination system for the weather surge arrester. . . . . . . . . . . . . . . . . . . . . . . . 367
station and the aircraft warning light . . . . . . . . . . . 345
Figure 9.18.11 DEHNguard type 2 SPD integrated in the inverter for the
Figure 9.16.3 Earth-termination system of a wind turbine . . . . . . . . 346 a.c. and d.c. side . . . . . . . . . . . . . . . . . . . . . . 367
Figure 9.16.4 Lightning and surge protection for a wind turbine . . . . . 348 Figure 9.18.12 Building without external LPS – situation A
Figure 9.16.5 Example of arresters installed at the zone boundaries of (Supplement 5 of the DIN EN 62305-3 standard). . . . . . 368
a wind turbine . . . . . . . . . . . . . . . . . . . . . . . 349 Figure 9.18.13 Building with external LPS and sufficient separation dis-
Figure 9.16.6 Modular type 2 surge arrester for protecting the tance – situation B (Supplement 5 of the DIN EN 62305-3
230/400 V supply . . . . . . . . . . . . . . . . . . . . . . 350 standard) . . . . . . . . . . . . . . . . . . . . . . . . . . 369
Figure 9.16.7 Protection of the stator side of the generator . . . . . . . 350 Figure 9.18.14 Determination of the protected volume using the pro-
Figure 9.16.8 Coordinated type 1 surge arrester . . . . . . . . . . . . . 350 tective angle method . . . . . . . . . . . . . . . . . . . . 370
Figure 9.18.15 Rolling sphere method versus protective angle method
Figure 9.16.9 DEHNmid medium-voltage arresters installed in a trans- for determining the protected volume . . . . . . . . . . . 370
former for wind turbines . . . . . . . . . . . . . . . . . . 350
Figure 9.18.16 DEHNcube YPV SCI 1000 1M type 2 arrester for pro-
Figure 9.16.10 Protection of wind measurement equipment tecting inverters (1 MPPT) . . . . . . . . . . . . . . . . . 371
(anemometer) . . . . . . . . . . . . . . . . . . . . . . . 351
Figure 9.18.17 Building with external LPS and insufficient separation dis-
Figure 9.16.11 Example of surge protective devices in a pitch system . . . 352 tance – situation C (Supplement 5 of the DIN EN 62305-3
Figure 9.16.12 Customer-specific testing in the impulse current laboratory . 352 standard) . . . . . . . . . . . . . . . . . . . . . . . . . . 372
Figure 9.17.1 Comparison: Conventional cell site (left) and cell site Figure 9.18.18 Example: Building without external lightning protection
with remote radio head technology (right) . . . . . . . . . 355 system; surge protection for a microinverter located in
the connection box of the on-site cables . . . . . . . . . . 373
Figure 9.17.2 Basic design of the remote radio head / unit in case of
roof-mounted systems . . . . . . . . . . . . . . . . . . . 356 Figure 9.19.1 Rolling sphere method vs. protective angle method for
determining the protected volume . . . . . . . . . . . . . 375
Figure 9.17.3 Remote radio head / unit and radio base station (RBS) Figure 9.19.2 Lightning protection by means of DEHNiso spacers . . . . 376
in case of ground-mounted masts . . . . . . . . . . . . . 357
Figure 9.19.3 Earth-termination system as per IEC 62305-3
Figure 9.17.4 Basic circuit diagram of remote radio heads (RRHs) in
case of physically separated functional equipotential (EN 62305-3) . . . . . . . . . . . . . . . . . . . . . . . . 376
bonding levels with d.c. box (outdoor) and DEHNsecure Figure 9.19.4 Pile-driven and screw-in foundation with a lightning
DSE M 2P 60 FM as well as with OVP box (indoor) and current carrying connection between the air-termination
DEHNsecure DSE M 1 60 FM . . . . . . . . . . . . . . . . 359 system and the earth-termination system . . . . . . . . . 377
Figure 9.17.5 RRH installation protected by a type 1 arrester in a Figure 9.19.5 UNI saddle clamp. . . . . . . . . . . . . . . . . . . . . . 377
typical installation environment . . . . . . . . . . . . . . 359 Figure 9.19.6 Lightning protection concept for a PV power plant with
Figure 9.17.6 Prewired hybrid box for 48 V d.c. outdoor installations central inverter . . . . . . . . . . . . . . . . . . . . . . . 378
with DEHNguard type 2 arrester . . . . . . . . . . . . . . 360 Figure 9.19.7 PV system with I max of 1000 A: Prospective short-circuit
current at the PV arrester depending on the time of day . . 379
Figure 9.17.7 Spark-gap-based type 1 arrester (typical characteristic
curve). . . . . . . . . . . . . . . . . . . . . . . . . . . . 360 Figure 9.19.8 Source characteristic of a conventional d.c. source
versus the source characteristic of a PV generator. When
Figure 9.17.8 Varistor-based type 1 arrester (typical characteristic curve) 360 switching PV sources, the source characteristic of the PV
Figure 9.18.1 Functional earthing of the mounting systems if no external generator crosses the arc voltage range. . . . . . . . . . . 379
lightning protection system is installed or the separation Figure 9.19.9 DEHNcombo YPV SCI type 1 + type 2 combined arrester
distance is maintained (DIN EN 62305-3, Supplement 5). . 364 with fault-resistant Y circuit and three-step d.c. switching
Figure 9.18.2 Lightning equipotential bonding for the mounting device. . . . . . . . . . . . . . . . . . . . . . . . . . . . 380
systems if the separation distance is not maintained. . . . 364 Figure 9.19.10 Switching phases of the three-step d.c. switching device
Figure 9.18.3 UNI earthing clamp: A stainless steel intermediate element integrated in DEHNcombo YPV SCI … (FM) . . . . . . . . 380
prevents contact corrosion, thus establishing reliable long- Figure 9.19.11 Surge protective device in a monitoring generator
term connections between different conductor materials . . 364 junction box . . . . . . . . . . . . . . . . . . . . . . . . 381
Figure 9.18.4 Distance between the module and the air-termination rod Figure 9.19.12 Lightning current distribution in case of free field PV
required to prevent core shadows . . . . . . . . . . . . . 365 systems with string inverter . . . . . . . . . . . . . . . . 381

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