Page 255 - Surge-Protection-E_0.pdf

Voltage Controlled Smart Decoupling Device VCSD

Voltage Controlled Smart Decoupling Device VCSD
• VCSD: Voltage Controlled Smart Decoupling Device
• Protection in case of transient, temporary and long-duration
overvoltages
• Does not negatively affect cathodic protection equipment
• Adjustable response threshold for flexible use in a wide range
of applications and operating states

VCSD 40 IP65: Voltage-controlled smart decoupling device with adjustable response threshold

The smart decoupling device VCSD 40 IP65 is a short-circuiting switch Monitoring / controlling
which is controlled by overvoltage and limits long-duration, temporary Due to the digital and analogue interfaces, the VCSD 40 IP65 can be ex-
and transient overvoltages. With the exception of direct currents, the VCSD ternally controlled, device faults can be displayed and discharge currents
is capable of discharging all interference voltages and limiting them to a can be signalled in the form of a 4 – 20 mA signal (scaled to 0 – 40 A).
preset value without negatively affecting the d.c. potential (cathodic pro- Voltage Controlled Smart Decoupling Device VCSD
tection potential). It limits the effects of dangerous high overvoltages in Fields of application
its immediate vicinity to a safe level. The VCSD 40 IP65 is ideally suited for pipelines which are influenced by
lightning strikes, electric railways or high-voltage lines. Typical fields of
Limiting behaviour of VCSD 40 IP65 in the time range application are remote insulated pipeline sections, cathodically protected
Transient overvoltages are limited to values < 1.25 kV (time range: up to containers / storage tanks, open earthing of cable shields at accessible
1 ms). places or the corrosion-free interconnection of isolated earth-termination
Temporary overvoltages are limited to values < 940 V depending on the systems such as the foundation earth electrodes of a building and an
duration (time range: 1 ms to 200 ms). isolated signal ground or railway earth electrode.
Long-duration overvoltages are limited to values between 3 and 50 V a.c. Advantages of the VCSD 40 IP65 are the flexible and controllable use in
(adjustable) (time range: > 200 ms). different fields of application, the high discharge capacity as well as a
tested, comprehensive, coordinated protection solution from the surge
Functional description protection specialist DEHN.
Thanks to the coordinated and tested interaction of the functional
units within the VCSD, the following overvoltage-related effects can be
prevented:
2000
Voltage limits acc. to EN 50443 Performance of VCSD 40 IP65
Undefined, lightning-related puncture and flashover at insulating 1500 fault interference operating limiting
clearances duration voltage time voltage
< 0.001 s
Lightning-related overvoltage is limited and the associated lightning voltage [V] 1250 ≤ 0.100 s 2000 Vrms 0.001 s ≤ 0.020 s 1250 Vpeak
≤ 940 Vrms
currents are discharged to local earth. 1000 0.100 s ≤ 0.200 s 0.020 s ≤ 0.100 s ≤ 660 Vrms
0.100 s ≤ 0.200 s
0.200 s ≤ 0.350 s 1500 Vrms ≤ 400 Vrms
1000 Vrms
Dangerous touch voltages at accessible places 650 0.350 s ≤ 0.500 s 650 Vrms 50 Vrms
Dangerous touch voltages are limited to below the maximum permissible 430 0.500 s ≤ 1.000 s 430 Vrms > 0.200 s from 3-50 V)
(adjustable
1.000 s ≤ 3.000 s
touch voltage for the duration of their occurrence. > 3.000 s 150 Vrms
60 Vrms
150
60
Reduction of a.c. corrosion caused by a.c. interference 0.1 0.35 1.0 3.0
Technical alternating currents between 16.7 Hz and 60 Hz can be perma- 0.2 0.5 time [s]
nently discharged to low-impedance earth electrodes without negatively
affecting the cathodic protection potential on long-distance pipelines. Limiting behaviour of the VCSD

Valid as of August 1, 2020 You will find detailed product information on our website 251