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
Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
2
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 qualied 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.
Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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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
Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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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.
Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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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)
Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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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 conguration 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.
Zakład Wytwórczy Aparatów Elektrycznych Sp. z o.o.
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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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