LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
APPLICATIONS
• Prevent internal arc in MV HV switchgear or
transformers
• Selective fault detection for fast plant
recovery
HIGHLIGHTS
• Remote indication by change-over contact
for fault condition
• Local fault indication by LEDs on the front of
device for quick verification
• Three independents channels to cover the
three compartments of a typical switchgear
• Optical fiber sensor up to 10 meters to allow
very fast and safe response
• IR and visible radiation sensitivity choice to
adapt to dark or open environments
• Very cost effective
• Suitable for GIS with adapter kit PLUG797
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 1/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
APPLICATIONS
The majority of faults in medium or low voltage switchgears are accompanied by an electric arc, which causes significant damage to
equipment and is a great hazard to human life. Breaking a fault within up to 100 ms enables the avoidance of most serious damage
to equipment and decreases a hazard to people in the vicinity of the place of fault occurrence. In case of long duration of the fault it
comes to dangerous bodily injures (burns, loss of eye-sight) including the loss of life. Besides, it comes to an irreversible and often
complete damage to the switchgear.
Because of serious hazards both to people and equipment, according to the regulations of the European countries, in the standards:
IEC 364-4-42:1980, IEC 298:1998+AC:1995, IEC 1330:1995 and IEC 439-1+AC:1994, it is recommended to undertake effective
protective measures in medium and low voltage switchgears as well as in transformer stations to reduce the effects of arc faults.
The fibre optic arc protection system type LAD localises arc fault at once. Considering the time of operation of the presently used
circuit breakers (30-50 ms), the protection system type LAD guarantees that the switchgear or its concrete bay will be switched off
within up to totally 60 ms thus reducing to minimum the effects of arc faults.
Moreover, to the unique features of arc protection system type LAD there should be included: possibility of selective tripping off the
bay where the fault has occurred (LAD Arc Protection System).
Use of a single LAD is able to cover the whole cabinet of a typical switchgear: cable compartment, circuit breaker and bus-bar
compartment are completely monitored and remotely selected by optical cables.
Equipping a switchgear or a transformer station with the arc protection system type LAD is an optimum way to meet the
requirements of appropriate standards in the scope of assuring the protection of the servicing personnel and equipment against
damaging effects of arc faults.
FUNCTIONS
Light arc detector, LAD, has up to three independent channels suitable for fault arc detection. Each channel has a changeover
contact for remote control. On the front of the device you have green leds for local indication of channel ready to react.
Total response time from arc detection to contact activation is less than 10 msec.
Arc detection is made by optical receiver sensible to IR radiation and the arc light is captured by optical plastic fiber inserted into the
tank in order to obtain simple cabling between the part under control and LAD device.
The contact of relay subsequently an arc fault changes its state and remains in that situation for 200ms to allow the switch-gear
opening.
The device was tested in accordance to IEC 60255-27 to guarantee the ultimate standard compliance to most sever worldwide
requirements for safety devices.
KIT ASSEMBLIES
N°1 LAD/HS/3/802 (24Vdc) or N°1 LAD/HS/3/805 (multi range voltage 48-230Vdc/Vac)
N°3 OPTICAL CABLE LAD/HS dwg. 43931143 (standard length 1500 or 3000mm)
N°1 LAD CABLE dwg. 43922259 LX=3000mm
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 2/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
Technical features Material
Rated input voltage :........................................24,48÷220 VDC External box :.......................................... Insulating Material
………………………………..……………………………………….…48÷230 VAC Filling Material :…………….…Polyurethan resin (2-component)
Input :....................……..…................... optical flash visible peak
Optical link: FOP (optical plastic fiber):……………….….1mm core Connection input :………….…...snap-in optical fiber connector
………………………………………………….…….2,2mm external cladding Output :…………………….…MOLEX MINI FIT 12 poles connector
Radiation filter:………………………………………Infrared plastic lens
Max distance link:……………………………………..……………………10m
Temperature range :............................................ -30°C ÷ 70°C
IP degree protection :.....................................................IP64(*)
……………….………………………………………... output connector IP30
Directives and standards applicable
Relays features
EMC directive :……..……………………….……………… 2004/108/EC
Contact material :....................................................…..AgCdO RoHS directive :………………………………………………. 2002/95/EC
Rated current /Max peak current: …………...………………...6/15A Low voltage directive: ………….……………………..…..2006/95/EC
Rated voltage/Max switching voltage:..…………….250/400 VAC
Rated load AC1:………………………………………………………..1500VA EN 55011: ……………….……….….…..(ISM) radio-frequency equipment
Rated load AC15 (230VAC):……………………………………..….250VA EN 61000-4-2: ……….………….…Imm. to electrostatic discharge (ESD)
Single phase motor rating (230VAC):……………………...0.185kW EN 61000-4-3: ……….……Imm. to radiated RF electromagnetic fields
Breaking capacity DC1 30/110/220V:…………..….. 3/0.35/0.2A EN 61000-4-4:………….……...Imm. to electrical fast transients - Burst
Minimum switching load:…….…………....500(10/5) mW(V/mA) EN 61000-4-5: …..….…………………………….……..…….Immunity to Surge
Mechanical life AC/DC:………………………...……-/20*10^6 cycles EN 61000-4-6: ……….……………….……..…Imm. to induced by RF fields
EN 61000-4-11: ….….…Imm. to voltage dips and short interruptions
Electrical life at rated load AC1: ………………... 100*10^3 cycles
EN 61000-6-2:2005: ……………………………..EMC) - Industrial emission
Insulation between coil and contacts:…………………………...5kV EN 61000-6-3:2007: ………………………....(EMC) - Residential emission
Dielectric strength between open contacts:…………..1000VAC EN 61000-3-3:2002: ………………………………………....…...(EMC) - Flicker
Vibration resistance(5-55)Hz,max +/-1mm: …………….….…10g
Shock resistance:…………………………………………………………...20g
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
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LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
LAD/HS
Drawing:
43911758
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 4/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 5/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 6/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
Accessories LAD: Optical cable LAD
Drawing:
43931143
Standard length 1500 or 3000mm. Other lengths available on request.
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 7/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
Accessories LAD: Electrical cable LAD
Drawing:
43922259
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 8/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
Accessories LAD: PLUG797
Drawing:
43911797
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 9/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
Angular power loss LAD
Drawing:
43911758
Electronsystem MD work in partnership with its customers in designing customized executions in order to meet specific
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
Page 10/11
LIGHT ARC DETECTOR
Type LAD/HS
ELECTRONSYSTEM MD TECHNICAL SHEET
Revision 0 of 20 February 2019
requirements, please contact us.
Leading companies trust in
superior knowledge
All specs are subject to change without notice
Via Madonna delle Rose, 72 24061 Albano S.Alessandro (BG) ITALY - Phone +39035584000, Fax +39035584099 E-mail: info@elecmd.it Web www.elecmd.it
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