1s20 application
TRANSCRIPT
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THE RELAY SPECIALISTS
relay monitoring systems pty ltd www.rmpl.com.au
1S20
Arc Fault Monitor
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1S20
Arc Fault Monitor
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1S20
Arc Fault Monitor
Electrical arc short circuits in metal clad switchgear and low
voltage panels may occur for many different reasons. defective or ageing insulating materials
poor bus or cable connections
poor maintenance human error
ingress of moisture, dust or vermin
abnormal service conditions
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Arc Fault
Effects and Consequences
ENERGY RELEASED BY ARC FAULTENERGY RELEASED BY ARC FAULT
PRESSURE
RISE
TEMPERATURE
RISE
VISUAL &
ACCOUSTIC
PHENOMENA
EFFECTS OF
FAULT ARC
CONSEQUENCES
FOR PLANT
MECHANICAL
STRESSING OF
ENCLOSURES
THERMAL STRESSING,
MELTING, FIRE
VAPOURISATION
CONSEQUENCES
FOR PERSONNEL
SHOCK WAVE,
FLYING DEBRIS,
OPENING PANELS
U/V BURNS &
EJECTION OF
FLAMES & HOT
GASES & SMOKE
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Switchgear Failure
Effects and Consequences
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Switchgear Internal Fault
Example
FAULT TIME
PROTECTION
TRANSFORMER
2 secs
OC-relay
110/22 kV
30 MVA
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Switchgear Internal Fault
Example
FAULT TIME
PROTECTION
TRANSFORMER
0.07 secs
Arc protection
110/22 kV
30 MVA
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Variable Speed Drive
Fault Example
PROTECTION
TRANSFORMER
Earth leakage
22 kV / 690V
Water CorporationWestern Australia
At approximately 0800 hrs on 25/2/07 No.2 VSDfailed at Tamworth Pumping Station WA. The
PSN electrician was called out to the fault later
that same morning and found the main switch
compartment of the drive badly damaged.
The extent of damage is quite severe and wascontained to the main switch compartment of the
variable speed drive.
The majority of damage appears to have been
originated from the VSD main switch, then
spreading upon explosion to the upper and rear of
the drive and also externally through the
ventilation ducts.
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Variable Speed Drive
Fault Example
The earth leakage protection on the #2
VSD 22kV / 690V feeder tripped.
The O/C protection also detected a phase
fault condition.
#2 22kV / 690V Transformer circuit breaker
was found to be in the OFF position.
Judging by the extent of the damage the
protection clearly did not respond quickly
enough.
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Variable Speed Drive
Fault Example
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Variable Speed Drive
Fault Example
OPERATOR HAZARD IN ADJACENT CORRIDOR
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Variable Speed Drive
Fault Example1S20 ARC FAULT PROTECTION INSTALLED AFTER EARLIER FAULT
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Variable Speed Drive
Fault ExampleSUBSEQUENT FAULT
As a result of this incident, RMS 1S20 ArcFault Monitors and 1S30 Arc Flash Sensors
were installed.
Subsequently several months later another
incident occurred, this time due to the failure
of the IGBT board.
As a consequence, the arc sensors were
triggered by tripping the 22kV circuit breaker
and as can be seen by the photos the
damage was insignificant.
1S30 ARC
SENSOR
ARC FAULT
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Variable Speed Drive
Fault ExampleSUBSEQUENT FAULT
ARC FAULT
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1S20
Arc Fault Monitor
The degree of damage caused by arcing
depends principally on the duration of the arc.
~100ms Arc Fault Duration
The switchgear needs to be checked & the
insulation resistance measured before power
can be re-established.
~200ms Arc Fault Duration
The power supply will be interrupted; the
switchgear must be checked; power is re-
established only after minor repairs.
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1S20
Arc Fault Monitor
~100ms Arc Fault Duration
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1S20
Arc Fault Monitor
The degree of damage caused by arcing
depends principally on the duration of the arc.
~500ms Arc Fault Duration
The supply is interrupted, metal parts of the
switchgear are destroyed & poisonous gases
are emitted.
~1s Arc Fault Duration
Destroys most of the switchgear & may cause a
fire, injury to personnel & damage to property.
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1S20
Arc Fault Monitor
~500ms Arc Fault Duration
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1S20
Arc Fault Monitor
Arguably the greatest risk of arc fault damage
exists at the CB cable termination & in the CB
chamber itself due to the slow clearance times
of the IDMT feeder protection.
The problem of arc faults is most prevalent in
older metal clad switchgear, which already has
operational protection systems.
The CB cable termination is particularly at risk to
ingress of moisture & rodent damage.
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System Integration
Trip on arc fault
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Single Line Diagram
1S30
1S20
Cable box only
Trip on Arc Fault
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System Integration
With current check using high speed starter element
Type: 1S20K1 [C] Vx: 48V DCSerial No: 126578
1S20 Arc Fault Monitor
ARC FAULT TRIP INITIATE
CBARC FAULT
MONITORSENSOR
OVER-CURRENT RELAY3 Pole OC + EF
RESET / TEST
System FunctioningArc Fault TripSystem ServiceDC Fail
GREEN:RED:
ORANGE:DARK:
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Single Line Diagram
Cable box and CT chamber
1S30
1S30
1S20
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Single Line Diagram
1S20
1S30
1S30
1S30
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Trip BUS CB(s)
Cable box, CT and CB chamber
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1S20 with 1S30 Optical Sensors
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1S30
Arc Sensor Installation
Mounting position of the
Sensor is not critical.
High sensitivity in
direction of View
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1S20 System Testing
Use camera flash to check operation of
arc sensor and pick up of 1S20 trip
contact.
Typical operating range of flash to arcsensor is 50 to 300mm
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1S20 System Testing
CRO trace showing nominal operation time of the trip contacts.
First contact touch at 6.25ms and fully closed by 7.25ms.
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1S30
Arc Sensor Installation
1S30 shown mounted on the outside of a switchgear panel
Detector oriented to look through a hole into the switchgear
Switchgear
panel
2 x M4self threading
mounting screws(Supplied)
Sealed cable
stress relief
Optical detectorprotruding through
hole in panel
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1S30
Arc Sensor Installation
1S30 shown mounted on the inside of a switchgear panel
Detector oriented to look out into the switchgear compartment
2 x M4self threading
mounting screws(Supplied)
Optical detectorfacing awayfrom panel
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1S30
Arc Sensor Installation
The dual optical detector version can be panel mounted
to monitor two adjacent switchgear compartments simultaneously.
Internal partition
between switchgearcompartments
Optical detectorprotruding through
compartment dividerinto adjacent
switchgear chamber
Optical detectorwindow facing away
from compartmentdivider
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1S30
Arc Sensor Installation
Flush mount reinforcing plate
1.2mm zinc plated mild steel
2 x M4self threading
mounting screws(Supplied)
Flush mountreinforcing
plate
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1S30
Arc Sensor Installation
SENSOR LOCATIONS
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Cable Box Arc Fault
Lower portion of Cover
strengthened
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Cable Box Arc Fault
Sensor location
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CB Chamber Arc Fault
CB chamber fault at 13.1kA (50mS)
Fault initiated by connecting 3 phases of circuit side
of CB with fuse wire
- typical of test leads used during maintenance.
One ARC sensor fitted.
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CB Chamber Arc Fault
General views after test
1S20
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1S20
Does it Work
WILL IT OPERATE UNDER DYNAMIC CONDITIONS? --- YES
HOW FAST DOES IT REMOVE AN INTERNAL FAULT? --- 50-75ms
IS IT EFFECTIVE IN ALL SWITCHGEAR CHAMBERS? --- YES
HOW MUCH DAMAGE IS CAUSED TO THE SWITCHGEAR? --- Minimal
DOES IT IMPROVE SAFETY? --- YES, Significantly
1S30
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1S30
Arc Sensor
measured current
( increase 1*In ==> 10*In)
arc detection
overcurrent detection
trip output contact
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One, two or three independent arc sensor inputs
Two high speed tripping duty arc sense output contacts
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Front Panel Indication
Solid red for 2s followed by:
Alternate red & green until reset.
Green solid
Orange solid
Alternate orange & red.
System healthy
1S30 Arc Sensor service
1S30 Arc Sensor continuous pick up
Flash green 3 times1S30 Power up test OK
Arc fault trip
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Front Panel
FRONT VIEW
Type: 1S20K1 [C] Vx: 48V DCSerial No: 126578
1S20 Arc Fault Monitor
RESET / TEST
System FunctioningArc Fault Trip
System ServiceDC Fail
GREEN:RED:
ORANGE:DARK:
52mm
SERIAL NO. & RATINGLABEL IN THIS POSITIONON REAR TERMINAL BLOCKFOR 1S20 [x][A][x] PANELMOUNT VERSION
REMOVE FORREAR CABLEENTRY OPTION
REAR VIEW
REMOVE FOR
TWO M4 OR 4BAMOUNTING SCREWS
32mm
TOP & BOTTOM REARTERMINAL BLOCKRETAINING SCREWS
31 1mmID
+
(7
5)
113mm
85mm
(30) (30)
(75)
PANEL CUT OUT DETAIL(Minimum clearance to other devices)mm
1S20K2(CAB)
AUX:36-150V
DC
S/N:123456
S f
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Panel or Surface Mounting
P l S f M ti
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Panel or Surface Mounting
86mm 25mm
Use double sided tape suppliedTop & bottom positions24mm
SIDE VIEW
RELAY PANEL3mm THICKMAXIMIUM
FRONT PANELLABEL
(Supplied with module)
SLIDE OUT CABLEENTRY POINTS3 ON ONE SIDE1 AT EACH END
TOP & BOTTOM REARTERMINAL BLOCK
RETAINING SCREWS
THESE MAY BEUNSCREWED &
REVERSED TO FITFROM THE FRONT OFTHE 1S20 MODULE TO
ALLOW SURFACEMOUNTING
RETENTIONSHROUD
1S20 Arc Fault Monitor
RESET / TEST
System Functioning
Arc Fault TripSensor 1 ServiceSensor 2 or 3 ServiceContinuous Sensor P/UDC Supply Fail
GREEN:
RED:ORANGE SOLID:ORANGE FLASH:ORANGE / RED:
NONE:
S/N:123457
DIN R il S f M ti
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DIN Rail or Surface Mounting
5mm
82mm24mm
SIDE VIEW
OPTIONALDIN RAIL CLIP
P/N H01180001B- DIN rail
mount version
DIN RAILRELEASE LEVER
SLIDE OUT CABLEENTRY POINTS3 ON ONE SIDE1 AT EACH END
S/N:123456
1S20K1 (CBB)ARC FAULT MON ITOR
DC FailArc Fa ult TripSystem FunctioningSensor 1 ServiceSensor 2 or 3 ServiceContinuous Sensor P/U
AUX:36- 150V DC
RESET / TEST
NONE:RED:
GREEN:ORANGE SOLID:ORANGE FLASH:ORANGE / RED:
1S20
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Switch 1: Optional arc sensor 2 ON or OFF
Switch 2: Arc fault trip indication LED reset
Switch 3: Independent arc trip ON or OFF
Switch 4: Arc fault trip output contact latch function;
ON for LATCHING, OFF for self reset.
Switch 5: Optional arc sensor 3 ON or OFF
Configuration Settings
ONONON
ONON
OFFOFFOFF
OFFOFF
1: ARC SENSOR 22: LATCHING TRIP LED3: INDEPENDENT ARC TRIP
4: LATCHING TRIP CONTACTS5: ARC SENSOR 3
1S20
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Wiring Termination
1S20 SOCKET TERMINAL LAYOUTViewed the from front when un-plugged from the main housing
(Always wire Arc Sensor 1. Arc sensor 2 & 3 optional)
22
11
33
44
55
66
88
99
1212
1111
1010
1S20
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Wiring Application
1S20 application diagram - Circuits shown in de-energised condition
12
8
10
9
9 or 11
5
1
3
11
6
2
4
Vx
+
+
Fail
alarm
Arc 1
Arc 3 Arc 2
Arc fault trip alarm signal toprotection relay status input for comms.
I>start
Control
Protection
1S20
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Overcurrentrelay
Arc faultrelay
I>
CB Aux Switch Trip Coil
52
T
52 - a
1S20 Ordering Code
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1S20 Ordering Code
Generate the required ordering code as follows: e.g. 1S20-CAB
1 AUXILIARY SUPPLY RANGE
A 20 - 60V DC
C 36 - 150V DC
2 MOUNTING
A Panel mount or surface mount
B DIN rail or surface mount only
3 SENSORS
A Two arc sensor inputs (Default)
B Three arc sensor inputs
PS5R POWER SUPPLY MODULEUse the PS5R-A24 DIN rail mount module to power a single 1from an 85-164V AC auxiliary source.
1 2 3
1S20 Arc Fault Monitor Relay
1S30 Ordering Code
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1S30 Ordering Code
Generate the required ordering code as follows: e.g. 1S30 AA
1 DETECTORS
A Single through hole panel detector
B Dual detectors
2 FLUSH MOUNT REINFORCING PLATE
A Not required
B Required
1 2
1S30 Arc Fault Sensor
1S28 Arc Fault Scheme
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1S28 Arc Fault Scheme
1S20
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Additional Information
Technical Bulletin
User Guide
Price & Availability
www.rmspl.com.au/1s20.htm
Test Manuals
www.rmspl.com.au/search.asp
Other Products
www.rmspl.com.au/products.htm