Cybertronix Sentinel EFI-BLZ User manual
Sentinel™ EFI-BLZ User’s Manual
Version 4.1 Page 2 of 11
CONTENTS
SAFETY..................................................................................................................................................3
WARRANTY...........................................................................................................................................3
1. OVERVIEW........................................................................................................................................4
2. FEATURES .........................................................................................................................................4
3. INSTALLATION ..................................................................................................................................4
3.1 CURRENT SENSOR ......................................................................................................................4
3.1.1 MULTI-CORE CABLE SYSTEM...............................................................................................4
3.1.2 SINGLE-CORE CABLE SYSTEM ..............................................................................................6
3.2 INDICATING UNIT .......................................................................................................................6
3.3 REMOTE INDICATOR ..................................................................................................................7
4. OPERATION ......................................................................................................................................7
4.1 CURRENT SENSOR ......................................................................................................................7
4.2 INDICATING UNIT .......................................................................................................................7
4.2.1 SCADA RELAY.......................................................................................................................8
4.2.2 REMOTE INDICATOR ...........................................................................................................8
4.2.3 MANUAL TEST .....................................................................................................................9
4.2.4 BATTERY SUPPLY .................................................................................................................9
5. TESTING............................................................................................................................................9
6. SPECIFICATIONS .............................................................................................................................10
7. ORDERING ......................................................................................................................................11
Sentinel™ EFI-BLZ User’s Manual
Version 4.1 Page 3 of 11
SAFETY
To avoid electric shock read the following carefully:
• Ensure that the current sensor is installed at earth potential on the HV cable system.
• Ensure that the current sensor is installed on the screened part of the cable system.
• Use caution during the installation and use of this product; high voltages and currents may be
present in the circuit.
• This product must be used only by qualified personnel practicing applicable safety precautions.
• Wear protective clothing and gloves as required.
• Do not install this product on live conductors.
• Always de-energize circuit before installing the current sensor and indicating unit.
• Always inspect the current sensor, indicating unit and all leads for damage before using the
product.
• Do not use the product if damaged.
WARRANTY
The Sentinel™ earth fault indicator electronic hardware and software is copyright Cybertronix cc
2014.
This product is warranted to be free from defects in material and workmanship for a period of
twelve months (12) from the date of shipment. Correction shall be in the form of repair or
replacement of the defective items or components, freight paid by the customer both ways. Such
correction shall constitute a fulfillment of all Cybertronix cc liabilities in respect to said items and
components. In no event shall Cybertronix be liable for consequential damage.
No other warranties:
To the maximum extent permitted by applicable law, Cybertronix cc disclaims all other warranties,
either express or implied, including but not limited to implied warranties of merchantability and
fitness for a particular purpose, with respect to the Sentinel™ product and accompanying product
manual. Cybertronix cc makes no representation or warranty that the product is 'error free', or
meets any user's particular standards, requirements or needs.
Disclaimer :
To the maximum extent permitted by the applicable law, in no event shall Cybertronix cc be liable
to the user for any special, indirect, consequential or similar damages, including any lost profits or
lost data arising out of the use or inability to use the product or documentation or any other data
supplied therewith even if the seller or anyone else has been advised of the possibility of such
damages, or for any claim by any other party. In the event of the above limitation not applying to
the user, then in no case shall the Cybertronix cc liability exceed the original purchase price of the
product.
Sentinel™ EFI-BLZ User’s Manual
Version 4.1 Page 4 of 11
1. OVERVIEW
The Sentinel™ earth fault indicator (EFI) is an electronic relay used for the rapid location and
isolation of earth faults on HV cable networks. The EFI can be used in radial networks or in openly
operated ringed networks. The path of the fault current from the feeding point to the fault location
is marked by the triggered EFI’s. The defective conductor segment is located between the last EFI
which has been triggered and the first EFI which is still inactive.
2. FEATURES
• Battery powered
• LED indication
• SCADA relay output contact
• Remote indication driver
• Split-core current sensor
• Three selectable trip levels or factory preset trip level
• 50ms minimum fault duration
• Manual test/reset facility
• IP65 environment protection
• Rugged and reliable electronics
• ISO9001 based quality assurance
• CE approved
3. INSTALLATION
3.1 CURRENT SENSOR
The Sentinel™ current sensor consists of a flexible steel core which is wrapped around the three-
phase system to be monitored and fastened tightly in place with adjustable cable-ties. The current
sensor is normally shipped fastened in a closed position. The cable-ties are released by depressing
the small ratchet on the head while bending back the tail. The current sensor should not encircle
the cable earthing as well. Instead, the cable earthing should bypass the current sensor.
The current sensor is available in two different sizes depending on whether it is to be applied to an
installation consisting of a multi-core cable or a system comprising of three single-core cables.
3.1.1 MULTI-CORE CABLE SYSTEM
Unless ordered otherwise, the unit ships with a standard current sensor sized for application on a
multi-core cable. The flexible sensor core is mounted on the screened part of the cable, below the
stripback point. The core is wrapped around the cable and the cable-tie is pulled tight as far as it will
go. A second cable-tie is used to hold the core firmly onto the cable. The cable screen is turned back
underneath the core and then terminated to earth as shown in the Figure 1.
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=
EARTH
CURRENT
SENSOR
FIGURE 1: CURRENT SENSOR MOUNTED ON MULTI-CORE CABLE SYSTEM
OUTGOING CABLE
TERMINATION
CURRENT
SENSOR
L1 L2 L3
EQUIVALENT CIRCUIT
SCREEN
CURRENT
SENSOR
(CT300)
EARTH
FIGURE 2: CURRENT SENSOR MOUNTED ON SINGLE-CORE CABLE SYSTEM
OUTGOING CABLE
TERMINATION
CURRENT
SENSOR
L1 L2 L3
EQUIVALENT CIRCUIT
SCREEN
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Version 4.1 Page 6 of 11
3.1.2 SINGLE-CORE CABLE SYSTEM
A larger current sensor (CT300) is available for application on single core cable systems. These
systems usually consist of three single-core cables spaced in a row, side-by-side. The flexible sensor
core is wrapped tightly around all three cables forming a rectangular oval, and fastened in place
with cable-ties. Care should be taken to ensure that the core is mounted on the screened part of
the cable. The screen of all three conductors should be turned back underneath the core and then
terminated to earth as shown in Figure 2.
3.2 INDICATING UNIT
The Sentinel™ indicating unit is normally flush mounted onto a vertical surface. When the cover is
removed, mounting holes are exposed for use in bolting the indicating unit to a surface. The current
sensor and other accessories are electrically connected to the indicating unit by feeding the leads
through cable glands on the indicating unit and connecting them to two-way screw terminals
mounted inside the indicating unit enclosure. With the cover and cable glands tightened firmly the
enclosure provides IP65 protection.
FIGURE 3: INDICATING UNIT SHOWING TERMINALS AND MOUNTING HOLESFIGURE 3: INDICATING UNIT SHOWING
115mm
65mm
Mounting
Holes
Battery
LED
Indicator
Remote
Indicator
Terminal
Test/Reset
Pushbutton
Auxiliary
Relay
Terminal
CT Terminal
Trip Level
Select
Enclosure
Lid
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Version 4.1 Page 7 of 11
REMOTE INDICATOR
A remote indicator can be ordered separately or ordered pre-installed. The remote indicator is
designed to be mounted through a hole in the switchgear enclosure so that it is visible from the
outside. The remote indicator mirrors the flash rate and duration of the primary LED indicator of
the main indicating unit.
4. OPERATION
4.1 CURRENT SENSOR
The Sentinel™ current sensor comprises of a flexible iron-core belt with a pickup coil. The belt is
fitted around the three-phase cable system being monitored and works on the core-balance current
sensing method. Under normal conditions the magnetic flux from the three phase currents
summates to zero and the pickup coil generates no voltage output. When an earth fault occurs the
summation flux is non-zero and a voltage proportional to the magnitude of the earth fault is
generated. The current sensor has no exposed metal parts and is completely encapsulated and
corrosion proof.
4.2 INDICATING UNIT
The primary indication on the EFI-BLZ is a light-emitting-diode (LED). The LED will flash at
approximately 1Hz when the EFI is in a tripped state and remain extinguished when the EFI is in a
reset state.
FIGURE 4: REMOTE INDICATOR
FRONT VIEW
SIDE VIEW
Ø M10
20mm
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The indicating unit continuously monitors the output signal from the current sensor. The current
sensor transmits a voltage which is proportional to the measured current. For primary currents in
excess of the trip level the current sensor saturates and a limiting circuit inside the indicating unit
clamps the output voltage to below 10V even for high fault currents. When an imbalance is
detected, onboard circuitry analyses the fault current. The magnitude and duration of the half cycles
of fault current are measured. Current spikes and glitches are ignored. As soon as valid fault current
has been detected, the Sentinel™ triggers and enters a tripped state.
The indicating unit is powered from a long-life lithium battery. The unit will reset from an on-board
timer after 4 hours or 8 hours (selectable via jumper) of LED flashing.
4.2.1 SCADA RELAY
An on-board relay provides a potential-free, normally-open contact for additional signaling to
SCADA. A 2-way screw terminal is provided on-board to which the user can connect a signaling cable.
A reset will latch the relay into the reset position (open). A tripped state will latch the relay into a
tripped position (closed).
4.2.2 REMOTE INDICATOR
An optional remote indicator can be ordered pre-installed or ordered separately. A 2-way screw
terminal is provided on-board for connection of the remote indicator. It provides flashing LED
indication at some distance from the main indicating unit. During a tripped state the unit will flash
FIGURE 5: TRIP LEVEL SELECTION
This jumper selects trip level.
Up to three trip levels can be factory
programmed as per customer
requirement.
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at a rate of about 1Hz. The remote indicator is weather-proof and is housed inside a brass bolt which
also makes it vandal-proof.
4.2.3 MANUAL TEST
A test/reset pushbutton is accessible on the front panel of the indicating unit. The pushbutton only
activates after being depressed for three seconds. This manual test/reset feature can both trip and
reset the EFI, as well as test the battery. After being manually tripped, the unit will automatically
reset after 60 seconds to prevent inadvertent wastage of the battery.
4.2.4 BATTERY SUPPLY
The Sentinel™ EFI-BLZ is powered by a replaceable, long-life, ½AA, 3.6V lithium battery. The battery
has a shelf-life which easily exceeds 10 years. During normal operation the quiescent current if the
device is so low that it approaches the self-discharge rate of the battery. Significant current is only
consumed when the device trips for an earth fault. Even then the power consumption is very
economical and the device yields more than 1000 flashing hours. The state of the battery can easily
be checked by manually testing the unit. If the battery is still healthy then the device will initially
flash rapidly (10 Hz) for a couple of seconds and then commence to flash at its normal rate (1 Hz). If
the battery requires replacement then on activation of the test facility, the indicating unit will only
flash at its normal indication rate (1 Hz) or not at all. The device is protected against battery reverse
polarity.
Complete battery technical details can be found under the Specification section.
5. TESTING
The Sentinel™ EFI can be fully tested by injecting test current though the current sensor. A test
procedure is suggested below.
1. Inject a current with a magnitude which is 20% below the selected trip level for 1 second. The
device should not trip.
2. Inject a current with a magnitude which is 20% above the selected trip level for at least 50 ms.
The device should trip.
3. The device will reset after 4 hours or 8 hours (selectable) or can be manually reset.
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6. SPECIFICATIONS
Network voltage range: 1-36kV
Trip current: 50A ±10A
Minimum fault duration: 2.5 cycles (50ms @ 50Hz / 40ms @ 60Hz)
Fault current withstand: 25kA for 1s
Primary indication: LED, flash rate 1Hz nominal
Timer reset: 4 or 8 hours selectable
Manual test/reset: Front pushbutton initiates trip/reset
Operating temperature: -20ºC to 70ºC
Enclosure
-dimensions 115mm × 65mm × 40m
-material ABS, grey
-mounting Flush-mounting, two M4 holes
-degree of protection IP65
-cable gland size: M12; cable diameter range 3-6.5mm
-mass: 250g
Current sensor
-standard size: 100mm diameter
-large size (CT300): 300mm × 100mm rectangular oval
-material: Insulated silicon steel
-mounting: releasable cable-ties
-lead length: 3m
-lead type: 2-core, 0.5mm2, doubly insulated
-mass: 250g
Auxiliary relay
-type: Latching, N/O on reset
-rating: 220Vdc, 250Vac, 2A
Remote indicator
-dimensions: M10 Hex Bolt 20mm long
-material: Brass
-mounting: Self-mounting through single M12 Hole
-lead length: 2m
-lead type: 2-core, 0.5mm2, doubly insulated
-degree of protection IP65
-indication method LED, flash rate 1Hz nominal
-mass 200g
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Battery
-type: 3.6 V, ½AA, lithium battery
-specification: Model ER14250 or similar
-international size refs: ½AA, 1/2R6, 1/2UM-3
-capacity: 1200mAH
-open circuit voltage: 3.7 V
-quiescent current: <5 µA
-flashing current: <0.8 mA
-shelf life: >10 years
-flashing life: >1000 flashing hours (>500 hours with remote indicator)
-temperature effects: no adverse effects -55° C to +85° C
-supplier: RS, Arrow Altech, Electrocomp
-alternate manufacturer: SAFT, Tadiran
7. ORDERING
ORDER NO: DESCRIPTION:
EFI-BLZ Sentinel™ EFI:
- Battery powered
- LED indication
- SCADA relay output
- Remote indication driver
- 50A default trip level
EFI-BLZ-S Sentinel™ EFI with selectable trip levels (specify)
EFI-BLZ-CT300 Sentinel™ EFI with larger current sensor (CT-300) instead of standard
size
EFI-BLZ-R Sentinel™ EFI with remote indicator preinstalled (R)
EFI-BLZ-R-CT300 Sentinel™ EFI with remote indicator (R) and large current sensor
(CT-300)
REMOTE Sentinel™ remote indicator
- LED Flashing
- Brass bolt housing
NOTE:
• The remote indicator is an optional component and must be specified (-R) if required.
• The EFI unit does not ship with any leads for the auxiliary relay output.
• The unused cable-glands ship with a rubber stopper inserted to maintain sealing integrity.
• The EFI unit ships in a brown corrugated cardboard box.
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