2. ++++General
The electric sectionalizer has been developed for use on overhead distribution lines to
improve reliability and service continuity. It enhances the protection of the distribution system
in a simple, economical way which is free from maintenance and spares. Statistics indicated
that 70% - 90% of fuse cutout operations are in response to transient faults. The electronic
sectionalizer enables customers to better manage these types of transient faults. It is
designed to substitute a fuse cutout, ensuring effective isolation only in the event of a
sustained fault. It remains unresponsive to transient faults. The sectionalizer is a self-
contained device, designed to be used in a coordinated overcurrent protection scheme with
automatic reclosers.
This sectionalizer uses micro-computer and operating trip mechanism and does not
require external auxiliary supply.And it is designed to withstand the mechanical forces
generated by high fault currents. Its design also caters for the durability needed with repetitive
hook stick closing in harsh outdoor environments.
The electronic sectionalizer incorporates electronic logic and trip circuits which are
controlled and powered by a dual core current transformer mounted on the copper conductive
tube.The current transformer is mounted externally to the conductive tube and encapsulated
in a durable weatherproof epoxy.
The electronic circuit provides the necessary intelligence for counting recloser tripping
operations and provokes the opening of the sectionalizer at the appropriate time. The
electronic circuit is encapsulated with epoxy, within the environmentally sealed conductive
tube. The tube acts as a faraday cage, protecting the electronic circuit from the influence of
magnetic fields.
Tripping is achieved when a solenoid located in the lower half of the conductive tube is
energized and the trip arm is released enabling the hinged trunnion to collapse.
++++Working principle
The current transformer built in the cutout sectionalizer can detect the current of the main
circuit and send the output to the electronic control for digital handling. When a fault occurs,
the upstream recloser (or circuit breaker) opens, the circuit loses voltage and the current is
lower than 300mA, the electronic controller can remember this opening time as a “count”. As
it accumulate the presetting number (1 to 4), the sectionalizer will automatic trips within
3. 1
180ms of fault interruption to isolate fault. Then the upstream recloser (or circuit breaker)
closes to restore power supply to the healthy section of the system to limit outage scope and
protect the main feeder in service. If the fault is temporary and is cleared before the
sectionalizer counter reaches the presetting number, the sectionalizer remains closed and
resets to its original state after its reset time expires.
++++Counts
The number of counts differentiates real faults from transient faults. When the preset
number of counts is registered, the electronic sectionalizer will operate.
The sectionalizer can be set to 1, 2, 3, 4 counts. It registers a count when a current dead
time exceeding 200 milliseconds occurs, immediately after a current pick up. This ensures
the sectionalizer only registers a count when a recloser has tripped due to a fault current.
The count setting should be one count less than the immediate upstreamrecloser.
++++Pick up current
The pick up current is the threshold, which must be exceeded in order to register a count.
The pick up requires a minimum fault pulse that is 10% greater than the pick up current setting
and is longer than 20 milliseconds in duration.
++++Resetting
The electronic sectionalizer will reset itself during the drop out operation. Do not need
remove the unit from its mount using a hook stick and reset it manually.
++++Service conditions
①The ambient air temperature is not above 55℃ or below -40℃.
②The average value of the ambient temperature, measured over a period of 24h,does not exceed 25
℃.
③The altitude does not exceed 1000 m (3300ft).
④The wind speed does not exceed 34 m/s (corresponding to 700 Pa on cylindrical surfaces).
⑤The ice coating does not exceed 1mm.
⑥The sectionalizer should not apply to those flammable, explosive, corrosive and severe
vibration conditions. As to other service conditions not covered in the manual, please
4. 2
contact and consult with the manufacturer for detail information.
++++Technical data
Rated actuating current: 8 to 400A
Reclaim time: 20 ±5%s
Operation counts: 1-4
Sensitivity of pick up current: ±10％
Max. load current prior to operation: 0.3A
Min. recloser dead time: 500ms
Min. duration of fault pulse: 10ms
++++Selection list
Please inform the order before ordering. For example:
Pick up current (A) Count/counts
I1 I2 I3 I4 I5 1,2,3,4
Note: Please view the label to know the section current(I1, I2, I3, I4, I5) .
5. 3
Dimension and Mounting Arrangements
Rating L
15.5KV 379
40.5KV 486
L
76
Note: 1. Installation mode can be designed according
to customer requirements.
2. Link must be balanced when installed.
Unit:mm
6. 4
Sectionalizer setting guide
①Current setting
The sectionalizer current setting must be selected at 20% below the minimum associated
recloser or circuit breaker trip current.
②Number of count setting
Generally the number of count settings should be ‘one’ less than the number of trips to
lockout of the recloser or circuit breaker.
8. 6
The following table is a description of how to choose the pick up current and
the counts.
Curre
nt
Counts
I1 I2 I3 I4 I5
1
2
3
4
Application
Normally, the sectionalizer is applied in conjunction with an upstream
recloser or circuit breaker.For Example:
The recloser applied in the substation is set (1 fast and 3 slow) 4 shots to
lockout and 6 units cutout sectionalizers (F1, F2, F3, F4, F5, F6) are applied in
the four branch line to separate 7 section ( L1, L2, L3, L4, L5, L6, L7). The
counts of F1 is set to 3 time, F2, F3, F5 are set to 2 times and F4, F6 are set
to 1 time. As shown in the following figure:
9. 7
If there is a fault E1 in section L5, a fault current flow the recloser and
sectionalizer F1, F3, F4, The recloser trip and all the line lost voltage, The
sectionalizer F4 trip after it reach to the presetting “count” number 1 and isolate
the fault section L5, the rescloser reclose and restore the healthy section L1,
L2, L3, L4, L6, L7 to service.
If a fault E2 in section L6, a fault current flow the recloser and sectionalizer
F1, F5, the recloser trip, if the fault is temporary, the recloser reclose to restore
the line in service, then the sectionalizer F1, F5 remains closed and resets to
its original state after a presetting time since it does not reach the presetting
10. 8
count number,. if the fault is permanent, the recloser fail to reclose successfully
and trip again, all the line lost voltage and the sectionalizer F5 trip to isolate
fault section L6 after it reaches the presetting count number 2, the sectionalizer
F1 remain closes state since it does not reach the presetting count number.
The recloser reclose again and restore the healthy section L1, L2, L3, L4, L5 to
service.
If a fault E3 in section L2, a fault current flow the recloser and sectionalizer
F1, the recloser trip. If the fault is temporary the recloser reclose to restore the
line in service, then the sectionalizer F1 remains closed and resets to its orginal
state after a presetting time since it does not reach the presetting count number.
If the fault is permanent , the recloser fail to reclose successfully and trip again
all the line lost voltage and the sectionalizer F1 trip to isolate fault section L2
after it reach the presetting count number 3, The recloser reclose again and
restore the healthy section L1 to service.
11. 9
The count number of sectionalizer is set 1 time normally as it applied in the
end of substation because almost fault occurring at the end of substation is
permanent and is set 2 or 3 times applied on the overhead line because almost
fault applied on the overhead line is temporary.
In this co-ordination, the sectionalizer can easily and optimized co-ordinate.
User notes
++++Maintenance instruction
1. Periodic test for correct operation 1 to 3 years. We recommend that
Sectionalizers are tested when the Associated Reclosers are maintained.
Sectionalizers should be tested in a suitable test set or laboratory.
2. If the Sectionalizers cannot be tested during routine maintenance, check de-
latching mechanism.
This can be done by rotating the Reset Lever until the Lever is
released. The sectionalizer should dropout freely and the trunnion
should then collapse freely.
The trunnion hinge has plated surfaces to prevent corrosion and provide
electrical contact. Clean and lubricate hinge using an electrical grade
silicon spray.
Wipe contact surfaces clean. When reinstalling into an old EDO base,
a light smear of contact grease on both top and bottom of contact
12. 10
surfaces may be beneficial.
3. Setting Changes
When setting changes are made to sectionalizers which have had
field service;
After removing top cap check that no moisture ingress has occurred.
Check condition of O-ring needs replacing, a thin film of O-ring grease is
recommended.
Note: Setting changes should be carried out in a dry environment
and switch housing should be dry before replacing cap.
Before making setting change, we recommend an operational test be
carried out using a suitable sectionalizer test set or laboratory.
++++Storage
The sectionalizer should be stored in a room with good ventilation. If
the sectionalizer were stored for a long time, it should be tested annually
and before using.
++++Inspection Checklist
Open the Sectionalizer packaging and inspect the unit for physical
damage.
View the nameplate and verify that the correct model has been
ordered.
Ensure the following items are included: Operation manual , Inspection
report and tools.
++++Before order pls clarify of your requirement with our tech
Copyright 2014 Farady Electric
Zhejiang Farady Electric Co.,Ltd
TEL:0086-577-61722510/61777258
Fax:0086-577-61777257
Http://www.farady-electric.com
Email:info@farady.cn
Add:Su’ao,Liushi,Yueqing,Zhejiang,P.R.China, 325604
