ZWAE ONIII Manual

INSTALLATION AND SERVICE MANUAL
Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
ONIII
Horizontal centre-break disconnector
Manual No DTR.01.02.07.EN

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zwae.com.pl
WARNING!
During the operation of electrical equipment, certain parts of
these devices are normally under dangerous voltage, and me-
chanical parts, also remotely controlled, can move quickly.
Failure to follow the warning instructions can result in serious
personal injury or material damage.
Only suitably qualied personnel can work on or near the device.
This personnel must know exactly all safety rules and rules for
maintaining the device in accordance with these instructions.
The problem-free and safe operation of this device requires
proper transport, proper storage, construction and assembly as
well as careful service and maintenance.

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Table of Contents
1. TRANSPORT ......................................... 4
1.1. Unpacking and inspection .............................. 4
1.2. Storage and transport.................................. 4
2. DESCRIPTION ........................................ 6
2.1. Construction and principle of operation ................... 6
2.2. Climatic conditions .................................... 7
2.3. Nameplate ........................................... 7
2.4. Basic technical parameters ............................. 8
3. INSTALLATION AND ADJUSTMENT ...................... 9
3.1. Preparing contact surfaces ............................. 9
3.2. Poles installation...................................... 10
3.3. Disassembly of the transportation blockade ............... 11
3.4. Operating mechanism installation ....................... 12
3.5. Pole coupling and adjustment ........................... 13
3.6. Earthing switches coupling ............................. 16
3.7. Earthing switches operating regulation ................... 17
3.8. Grounding of the base frames ........................... 18
4. OPERATING MANUAL ................................. 19
4.1. Notes about connecting activities ....................... 19
5. INSPECTIONS AND MAINTENANCE ...................... 19
5.1. Visual inspections .................................... 19
5.2. Periodic inspections ................................... 19
5.3. Spare parts and recommended maintenance materials ..... 20
6. UTILIZATION ......................................... 20

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1. TRANSPORT
1.1. Unpacking and inspection
Immediately after receiving the disconnector one should check the delivery compliance with the packing list.
Then should be checked whether the disconnector has not been mechanically damaged during transport and
the data on the nameplate match the order.
1.2. Storage and transport
Disconnector poles are transported in assembled condition (ONIII-72, ONIII-123, ONIII-145, ONIII-172) or
partially assembled condition (ONIII-245, ONIII-363). During unloading and installation process, the discon-
nector poles should be lifted using transport belts, placed in the manner shown in the following graphics.
During transport, disconnector poles are placed on wooden beams, which should be removed immediately
before placing the pole on the supporting structure. For this purpose 4 screws should be unscrewed using a
wrench size 13.

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During transport, the poles must be secured against tipping over and the central contact should be open. The
disconnector can be transported by means of transport with open cargo area. On flat, hard, even surfaces it is
allowed to move the disconnector’s poles with a pallet truck in the manner shown below, with particular care
to prevent the pole from tipping over.
Disconnector poles can be stored in the open area, but poles should be set so that the base frame does not
stand directly on the ground.
8x70 (4 pcs)

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2. DESCRIPTION
2.1. Construction and principle of operation
Outdoor disconnector type ONIII- ... is an insulating, two-column switch, with rotating and horizontal contacts
movement. It is intended to work in networks with voltage corresponding to the rated voltage, at frequencies
up to 60 Hz inclusive. The disconnector can be used as a single-pole switch with an individual operating
mechanism or in three-pole set with one common operating mechanism. Disconnector’s poles can be set in
parallel or in serial connection. Disconnector’s sketch in parallel conguration is shown below.
Current path
Base frame
Rotating base
Earthing switches coupling mechanism
Poles coupling mechanism
Right-sided earthing switch
Left-sided earthing switch
Operating mechanism's supporting structure
Operating mechanism

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2.2. Climatic conditions
The disconnector is designed for outdoor operation, at ambient temperature from -50 to +40 ° C and relative
humidity up to 100%.
2.3. Nameplate

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2.4. Basic technical parameters
No. Parameter Value
1. Rated operating voltage 72,5 [kV] 123 [kV] 145 [kV] 172 [kV] 245 [kV] 363 [kV]
2. Rated current
1600 [A]
2500 [A]
3150 [A]
4000 [A]
1600 [A]
2500 [A]
3150 [A]
4000 [A]
1600 [A]
2500 [A]
3150 [A]
4000 [A]
1600[A]
2500 [A]
3150 [A]
4000 [A]
1600 [A]
2500 [A]
3150 [A]
4000 [A]
1600 [A]
2500 [A]
3150 [A]
4000 [A]
3. Peak current 125 [kA] 125 [kA] 125 [kA] 125 [kA] 125 [kA] 125 [kA]
4. Short-circuit current, 1 sec. 50 [kA] 50 [kA] 50 [kA] 50 [kA] 50 [kA] 50 [kA]
5.
Test voltage (50 Hz) for insulation:
- to earth and between phases,
- between contacts of one pole.
140 [kV]
160 [kV]
230 [kV]
265 [kV]
275 [kV]
315 [kV]
300 [kV]
315 [kV]
460 [kV]
530 [kV]
560 [kV]
750 [kV]
6.
Surge test voltage for insulation:
- to earth and between phases,
- between contacts of one pole.
325 [kV]
375 [kV]
550 [kV]
630 [kV]
650 [kV]
750 [kV]
650 [kV]
790 [kV]
1050 [kV]
1200 [kV]
1175 [kV]
1450 [kV]
7. Radio interference voltage <1000 [µV] <1000
[µV]
<1000
[µV]
<1000
[µV] <100 [µV] <250 [µV]
8. Rated mechanical operating life: 2000
cycles
2000
cycles
2000
cycles
2000
cycles
2000
cycles
2000
cycles
9.
Dedicated operating mechanism:
- motor,
- manual.
NSO80
NR-5
NSO80
NR-5
NSO80
NR-5
NSO80
NR-5
NSO80
NR-5 NSO80
10.
On / off capacity (inductive and ca-
pacitive load) - version with arcing
contacts, 100 cycles
-
2 [A]
(up to
76 [kV])
-
2 [A]
(up to
152 [kV])
2 [A]
(up to
225 [kV])

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3. INSTALLATION AND ADJUSTMENT
The delivered disconnector is completely regulated and ready to work. Installation is reduced to:
a) installing poles on a supporting structure,
b) attaching supporting constructions for the operating mechanisms,
c) installing of operating mechanisms,
d) poles coupling and its regulation,
e) earthing switches coupling,
f) earthing switches regulation,
g) grounding the base frame and the operating mechanism.
3.1. Preparing contact surfaces
The contact resistance of touching each other elements depends primarily on the quality and cleanliness of
the contacting surfaces. These surfaces should be very precisely prepared. The method of preparing alumini-
um and silver contact surfaces is described below:
• aluminium – aluminium connection
the oxide layer from the contact surface should be removed by using a wire brush. After this treatment, the sur-
face should be matt gray, devoid of shiny areas. Any chips and aluminum dust should be thoroughly removed
from the surface, eg by lubricating with acid-free grease and then removing it. After this treatment, the surface
should be greased with acid-free grease to protect it from oxidation of aluminum. The prepared surface should
not be exposed to the atmosphere longer than the time needed to prepare the cooperating surface.
• Copper – silver connection
The copper surfaces should be cleaned of oxides by using a brass wire brush and then should be proceeded
as for the aluminum surface. Silver surfaces do not need to be cleaned with a brush, but they can be cleaned
with a delicate abrasive material, eg steel wool. After cleaning the surface should be covered with a thin layer
of acid-free grease.

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3.2. Poles installation
The disconnector poles should be placed on the supporting structure, which has mounting holes in accordan-
ce with the drawing below.

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3.3. Disassembly of the transportation blockade
Transportation blockades should be removed from the poles attached to the supporting structure.
To remove the transportation blockade, the M10 screw in the disconnector base frame and the M12 screw
in the drive lever have to be unscrewed. After removing the lock, the M12 screw must be screwed back in the
same place.
Transportation blockade

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3.4. Operating mechanism installation
The operating mechanism should be mounted to the supporting structure, under crank gear located in discon-
nector’s base frame. After the operating mechanism is suspended, a drive shaft, which connects operating
mechanism to the crank gear should be mounted. The assembly method is shown in the gure below.
Crank gear
Coupling shaft
Operating mechanism's supporting structure
Operating mechanism
Tightening torque: M12 - 80 Nm, M16 - 100 Nm.

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3.5. Pole coupling and adjustment
After setting the poles on the supporting structure, one should check the limit positions of the current paths
and, if necessary, correct the position of the bumpers and the lengths of the coupling tie rods of the discon-
nector’s kinematic system. After checking the correctness of operation of the poles the coupling rods can be
assembled.
Tightening torque of M16 screws - 100 Nm.
Current path position adjustment screws
Current path rotation angle limit bumper
Coupling tie rod

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Poles coupling regulation lies in such a setting of the length of the tie rod and coupling lever location adjust-
ment so that the current paths at each pole reach the limit positions according to the following requirements.
Regulation process should be performed in following way:
a) initially coupling tie rods should be installed in such a way that one pole would not be connected (tie rod
ending hang on a line, below coupling lever),
b) coupling tie rod should be extended or shortened in such a way that current path in driving pole would
achieve require limit positions. If tie rod length change forecloses achievement of the limit positions driving
lever position should be changed on driving pole. The next gure presents the behavior of the disconnector’s
poles when changing the position of the drive lever while maintening the same length of tie rod. After changing
the position of the lever it is necessary to correct the length of the tie rod and check the limit positions of the
current path.
c) after nishing one pole’s coupling regulation it is permitted to tighten up tie rod to the last pole and repeat
steps from subpoint b.
Typ A B C D E
ONIII-72 1300 900 632 710 798
ONIII-123 1900 1450 1020 1090 1320
ONIII-145 2100 1600 1160 1365 1498
ONIII-172 2500 1600 1560 1365 1498
ONIII-245 3500 2295 2090 2100 1960
ONIII-363 5000 3420 2920 2700 3310

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Regulation lever – Left position. Regulation lever – Right position. Regulation lever – Neutral position.

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3.6. Earthing switches coupling
Earthing switches have to be coupled using coupling shafts, which lenght is presented in the table below.
Left earthing switch shaft
Right earthing switch shaft
Type
Application
Disconnector’s and
earthing switches driving
shaft
Coupling shaft – left
earthing switch
Coupling shaft – right
earthing switch
ONIII-72 A = 615 A = 700 A = 765
ONIII-123 A = 615 A = 1300 A = 1360
ONIII-145 A = 615 A = 1500 A = 1560
ONIII-172 A=615 A=1500 A=1560
ONIII-245 A = 750 A = 2777 A = 2855
ONIII-363 A = 750 A = 4277 A = 4355

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In lower end position, the earthing
blade's ending can not be located
over insulators coupling tie rod.
(Apply to ONIII-72 and ONIII-123)
3.7. Earthing switches operating regulation
Earthing switches regulation lies in such setting of coupling shafts that earthing knives on each pole should
achieve limit positions in accordance with requirements presented in the drawing below and earthing circuit
closing occur simultaneously.
On earthing switches coupling shaft should be set earthing
switch’s locking, in order to enable earthing switch to work
only with open disconnector. Figure below shows way of t-
ting of the locking.
Contacts points of contacts
location

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3.8. Grounding of the base frames
After disconnector’s and earthing switches regulation, apparatus base frames have to be grounded. Earthing
terminals are marked on disconnector’s base frame. In case of grounding of disconnector with built- up ear-
thing switch, an earthing wire should be connected as close as possible to line linking earthing switch knife with
base frame. Terminals location is presented in gure below.

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4. OPERATING MANUAL
Disconnector’s switching is achieved by using an appropriate motor or manual operating mechanisms.
4.1. Notes about connecting activities
a) While disconnector’s or its earthing switch’s manoeuvring all safety at work rules applicable in installation’s
location should be respected.
b) Energized disconnector can be manoeuvred only when capacity of intermittent current will have negligible
value or any signicant voltage change between any pole’s contact elements would not appear. Disconnector
equipped with commutating contacts is ready to switch off currents specied in technical data.
c) The disconnector must not be closed until its earthing switch has been opened.
d) Disconnector’s earthing switch can be manoeuvred from open to close position only:
• If the disconnector is in open position,
• After ensuring that earthing switch will be working under discharging current of the bushings, rails, incoming
supplies, short cables and power lines capacities, with current and voltage parameters specied in technical
data.
5. INSPECTIONS AND MAINTENANCE
5.1. Visual inspections
It is recommended to carry out visual inspections in accordance with rules being in force in switchgear or after
each failure or short circuit. Check in particular:
a) condition of current path’s central contacts,
b) condition of earthing switch’s contacts.
5.2. Periodic inspections
It is recommended to perform periodic and maintenance inspections in accordance with rules being in force
in switchgear. During check-up and maintenance the using of energetic devices rules and health and safety at
work rules have to be respected for safety of carrying out the job maintenance personnel.
Check and perform in particular:
a) condition of current paths central contacts,
b) condition of earthing switch contacts,
c) condition of mechanisms, bearings and connection components,
d) correction of achieving limit positions,
e) condition of anti-corrosion protective coatings,
f) lubricate current path’s central contacts and earthing switch’s contacts,
g) lubricate ball joints.

5.3. Spare parts and recommended service materials
The use of high quality components and operational experience indicate long live service of disconnectors
(about 40 years). If the disconnector is damaged due to improper assembly or operation, it is possible for the
manufacturer to repair it for a fee. Disconnector type ONIII does not possess any parts, which should be re-
placed during normal operation in service life.
For disconnectors maintenance, materials listed below have to be used:
a) WHITE PHARMACEUTICAL PETROLEUM JELLY (acid-free) used for lubrication electric contacts (earthings,
contacts of HV switches),
b) LUBRICANT for bearings, for example LT4 or similar, used for lubricating ball joints.
6. UTILIZATION
The ONIII disconnectors are made of materials that are recyclable.
The main materials from which the disconnectors are built are:
• steel (hot-dip galvanized);
• aluminum;
• copper.
The disconnectors do not contain any dangerous substances. In accordance with applicable regulations, it is
possible to return a worn-out, complete disconnector to the manufacturer.
Zakład Wytwórczy
Aparatów Elektrycznych Sp. z o.o.
Gdańska 60, 84-300 Lębork
POLAND
Correspondence address
Kębłowo Nowowiejskie, ul. Łąkowa 2
84-351 Nowa Wieś Lęborska
POLAND
[email protected]
tel.: [phone]
www.zwae.com.pl
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