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DESITEK A/S
DESITEK A/S
- ATEX-forum 18. november 2014
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Eksplosionstrekanten
Gas / støv
Luft / ilt
Tændkilde
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Oil refinery Pertamina, Cilacap/Java, 1995:
7 tanks burned out due to a lightning strike
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Agenda
• Lynbeskyttelsesstandarden
• Separationsafstand – isoleret lynbeskyttelse
• Lynindfangere og Ex-zoner
• Anvendelse af skillegnistgab over isolerende flanger
• Overspændingsbeskyttelse af egensikre kredse - Ex(i)
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynbeskyttelsesstandard DS/EN 62305
IEC 62305-1
Lightning threat
IEC 62305-2
Lightning risk
LP
LPS
IEC
62305-3
© 2014 DEHN + SÖHNE / protected by ISO 16016
LP: Lightning Protection
SPM
IEC
62305-4
LPS: Lightning Protection System
SPM: Surge Protection Measures
Protection measures
TOL 18. nov 2014
Lyn-parametre
DS/EN 62305-1
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Separationsafstand
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynbeskyttelse udlignet direkte til ledende installationer
ROOF
direct connection
connection via
isolating spark gap
FIRST
FLOOR
GROUND
FLOOR
data lines
BASEMENT
CPU
TB
MEB
TB: terminal board
MEB: main earthing busbar
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Isoleret lynbeskyttelse
ROOF
separated system
s
FIRST
FLOOR
GROUND
FLOOR
data lines
BASEMENT
CPU
TB
MEB
TB: terminal board
MEB: main earthing busbar
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Kurveform (test procedure)
Lynstrøm vs. induceret strøm
100 kA
Wave shape µs
I (kA) 80 kA
i max. kA
Q As
W/R J/Ω
60 kA
1
2
10/350
8/20
100
50
2,5 ·106
5
0,1
0,4 ·103
50 kA
40 kA
1
20 kA
2
20 µs
200 µs
© 2014 DEHN + SÖHNE / protected by ISO 16016
350 µs
600 µs
800 µs
t (µs)
1000 µs
TOL 18. nov 2014
S1
Isoleret lynbeskyttelse
S1
exhaust gas stack
isolated connection
s
s
measuring and control
conductors,
intrinsically safe
Ex zone 1 / 2
MEB
natural gas compressor
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Definitionen af separationsafstand
=
© 2014 DEHN + SÖHNE / protected by ISO 16016
Afstanden mellem to
ledende dele, hvor ingen
farlige gnister kan
forekomme
TOL 18. nov 2014
Separationsafstand (s)
Problematisk installation af ledende installationer
kc
s = ki •  • l [m]
km
kc
s
km
l
electric conductor
class of LPS
ki
I
0.08
II
0.06
III und IV
0.04
Material in the
separation
section
km
air
1
Concrete / brick
0.5
DEHNiso
0.7*
MDB with SPD
MDB: Main Distribution Board
SPD: Surge Protective Device
Ref.: IEC 62305-3:2010; Annex E, Figure E.38 modified
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Separationsafstand ikke overholdt !
Forkert installation
s
s
s: separation distance
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Nærføring til den elektriske installation !
Forkert installation
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Isoleret indfanger-system
Opgave med DEHNiso Afstands-holdere
Ref.: Wettingfeld GmbH + Co. KG, Krefeld
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynbeskyttelsessystem – Skematisk diagram
Opbevarings-tank
Air-termination system only
suitable for protecting
electrical equipment
such as FIDs, cameras,
measuring and control
equipment, lights, etc.
Lightning equipotential bonding
Lightning current arrester
Lightning equipotential bonding
Stored measuring circuit
ϑ
FID
air-termination rod
s
s
earth-termination
system type B:
“ring earth electrode“
storage tank
FID: Flame ionisation detector
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Kompressor station
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Jording og potentialudligning af tank-farme
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Jording og potentialudligning
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere
Og Ex-zoner
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
Den geometriske beskyttelsesmodel
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
Den geometriske beskyttelsesmodel
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
Den geometriske beskyttelsesmodel
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Lynindfangere og Ex-zoner
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Anvendelse af skillegnistgab
Over isolerende flanger
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Anvendelse af skillegnistgab
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Installation of EXFS 100
electric actuator, e.g. MOV (motor
operated valve)
detail
EXFS
100
16 mm²
Cu
Insulating
flange
cathodic
corrosion
protection
ground
earth-termination
system
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
5 punkter for valg og korrekt installation af Ex
skillegnistgab
1. Lynbeskyttelsesklasse (LPL) DS/EN 62305-1
2. Isolationsniveau for den isolerende flange
3. Valg af skillegnistgab
4. Længde på forbindelsesledning
5. Koordinering mellem isolerende flange og skillegnistgab
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
1. Risiko for lynnedslag og overspændinger for rørsystemer
Strøm-deling
S1
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
1. Lynstrømsparametre DS/EN 62305-1
Current parameters
First short stroke
Peak current
Short stroke charge
Specific energy
Time parameters
Average steepness
© 2014 DEHN + SÖHNE / protected by ISO 16016
Symbol Unit
I
II
I
kA
200
150
Qshort
W/R
T1/T2
di/dt
C
MJ/Ω
100
10
75
5.6
µs/µs
kA/µs
LPL
III
IV
100
50
2.5
10/350
20
15
10
TOL 18. nov 2014
1. Lynstrømsparametre ved valg af skillegnistgab
Strømdeling 50:50
Current parameters
First short stroke
Peak current
Short stroke charge
Specific energy
Time parameters
Average steepness
© 2014 DEHN + SÖHNE / protected by ISO 16016
Symbol Unit
I
II
I
kA
100
75
Qshort
W/R
T1/T2
C
MJ/Ω
50
5
37.5
2.8
di/dt
µs/µs
kA/µs
LPL
III
IV
50
25
1.25
10/350
10
7.5
5
TOL 18. nov 2014
2. Isolationsniveau for den isolerende flange
AfK recommendation No. 5, July 2010:
Cathodic corrosion protection in potentially explosive
atmospheres
Two classifications:
Class 1 UPW : 5 kVrms
Insulating joint
Class 2 UPW : 2.5 kVrms
© 2014 DEHN + SÖHNE / protected by ISO 16016
UPW
TOL 18. nov 2014
3. Valg af skillegnistgab – et par vigtige punkter
AfK recommendation no. 5
• I henhold til EN 62561-3: (Krav og test af skillegnistgab (ISG) til
lynbeskyttelsesanlæg)
• Lynstrømsbærende: class H eller N
• Lyn impuls Iimp (10/350 µs): 100 kA (H), 50 kA (N)
• Impuls overslagsspænding Uas (1,2/50 µs)
(Class 1 Upw 5 kV): ≤ 2,5 kV
(Class 2 Upw 2,5 kV): ≤ 1,25 kV
• ATEX certifikat/mærkning for relevant installationssted
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
4. Længde på forbindelsesledning
Længde på forbindelsesledning ?
≤ 300 mm – ok
> 300 mm – bevis at koordineringen
mellem gnistgab + ledning og den
isolerende flange er ok
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
4. Længde på forbindelsesledning
(di/dt)max
(di/dt)max
L
R
© 2014 DEHN + SÖHNE / protected by ISO 16016


 of the connecting
cable


TOL 18. nov 2014
Voltage drop [kV]
4. Spændingsfald over forbindelsesledning
steepness:
steepness:
steepness:
Connecting cable length [cm]
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
5. Koordinering mellem isolerende flange og
skillegnistgab
insulating joints
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Overspændingsbeskyttelse
Egensikre kredse Ex(i)
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Kerosintank i
Holland eksploderer
efter lyn i 1975.
Årsag:
Manglende
beskyttelse på
målekabel.
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014
Overspændingsbeskyttelse af egensikker kreds - Ex(i)
© 2014 DEHN + SÖHNE / protected by ISO 16016
TOL 18. nov 2014