KON^AR
KONCAR – MEDIUM VOLTAGE APPARATUS, Inc.
MEDIUM VOLTAGE DISCONNECTOR SWITCHES for indoor installation
Series RSN
General Information
Disconnector switches are part of traditional medium voltage assortment. They have been designed and
manufactured in accordance with IEC 62271 – 103 (2003).
Disconnector switch is an apparatus which is capable of closing and breaking load currents up to rated
current level, at cosφ = 0,7, as well as currents of off-load transformers, cables and overhead lines and
closed loop currents. Under fault conditions the disconnector switch can carry the short circuit current for a
considerable short time, but it is not capable of breaking it. The disconnector switch in series with HRC
fuses can break the short circuit current, where blown fuse in any phase automatically causes three-pole
tripping of the disconnector switch.
In open position the disconnector switch provides required visible insulating distance between contacts.
This feature enables the use of disconnector switch at the network points where visible insulating distance
is required. In these cases the disconnector switch can take over all nominal current breaking operations
which would otherwise require the circuit breaker.
Fuse-switch combination also successfully replaces the combination of circuit breaker – disconnector at
the network points where rapid auto-reclosure is not required.
Basic Characteristics
Disconnector switch has the following basic characteristics:
-
small dimensions, due to linear contact movement
quick arc quenching and high switching capability, due to two serial breaking points in each pole, as
well as gas-generating insulating material in quenching cambers
high availability and reliability, due to simple construction and quality of material
minimal maintenance
disconnector switches can be equipped with earthing blades and HRC fuses; auxiliary switches
at disconnector switches with spring charging-energy storing mechanism the tripping release can be
fitted
Disconnector switches series RSN are manufactured in following versions:
- version n – for back cell wall installation
- version b – for lateral cell wall installation
- version s – for front cell wall installation
Earthing blades can be fitted to any of the versions listed above, at upper or lower side.
Construction and Mode of Operation
The poles are attached to the base frame by two post insulators series JOr (epoxy cast resin ribbed
insulators). The operating mechanism with operating levers is also attached to the base frame.
Operating mechanisms for disconnector switches series RSN:
-
m1 – turn-over mechanism
m2 – spring charging – energy storing mechanism (suitable for remote control)
RSN; Catalogue Eng. 2005; Page(s) 1/9
The disconnector switch type RSN 24n – m2 Od with energy storing mechanism type m2 is presented at
the Fig.2.
LEGEND:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
base frame
post insulator
connection point
movable insulating cylinder
operating rods
insulating screen
main shaft
operating regulation lever
operating mechanism’s main shaft
operating mechanism type m2
HRC fuse
insulating screen between poles / 24 kV only
lower fuse carrier
The movement transmission between the main
shaft (Pos.10) and moving contact is enabled by
telescope operating rod (Pos.6) which consists of
two parts and ensures linear movements of moving
contact during switching operations.
Fig. 2. Disconnector switch type RSN 24n – m2 Od
Current Path and Arc Quenching
The pole cross-section at current breaking (in open position) is displayed at Fig. 3.
LEGEND:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
a) closed position
b) opening
upper connection point
lower connection point
upper fixed contact
lower fixed contact
moving contact
quenching chamber
lower supressor
quenching chamber
upper supressor
insulating cap / 24kV
only
insulating cone
upper movable
insulating cylinder
lower movable
insulating cylinder
c) open position
Fig. 3. Pole cross section - RSN 24n – m2 Od
During tripping operation the movable insulating cylinders (10) with moving contacts (5) of the switch
disconnector are moving towards lower position, by means of operating rods (Fig. 3. – Pos. a).
RSN; Catalogue Eng. 2005; Page(s) 2/9
After contact separation during the linear movements, the two arcs connected in series occur at the ends of
fixed contacts and both ends of moving contact, in the narrow slots between arcing contact rings made of
special wolfram alloy. Both arcs are quickly quenched, due to released gases from insulating parts at the
both sides of slots.
Insulating material used for arcing chambers has high gas-generating properties. Also, no layers of soot
occur even after numerous switching operations, which enables the quenching time stays short enough.
The supressors (Pos. 6 and 7) prevent the released gases to enter the space between contacts.
Serial connection of two breaking points at each pole doubles the arc extension speed in relation to contact
separation speed, so there is no need for additional delaying arcing contacts.
When the moving contact is almost at the end of its stroke, the insulating cap (Pos.8) goes down to final
place between contacts, and provides additional insulation between contacts.
Serial connection of two breaking points has also a favourable effect at closing operation. The speed of
contact movement is doubled, and the pre-arcing times considerably short. These features enable that
minimal energy is released in disconnector switch during closing operation.
Operating Mechanisms
The two kinds of operating mechanisms can be built in disconnector switches series RSN:
-
-
turn-over m1 – the closing and opening operations are performed by two pressure springs, which are
turned by coupler or regulating lever until they reach neutral position and overcome the friction angle.
From this position the springs discharge instantaneously and turn the main shaft to position closed or
open, depending on their previous position. The way of closing is presented at Fig. 4.
spring charging – energy storing mechanism m2, (suitable for remote tripping) – the switching
operation is performed by two systems of springs which are charged simultaneously. When the spring
charging is complete, the closing spring performs the closing operation immediately. The tripping
spring remains charged in order to enable tripping operation either manually or remotely (on purpose,
by push-button and tripping release, or automatically – by tripping release triggered from HRC fuse
striking needle or impulse from protection). The tripping procedure is presented at Fig.5.
Operating mechanisms of disconnector switches series RSN are simple and reliable, so they guarantee
faultless operation of apparatus under any service condition.
a) open position
b) ready to close
c) closed position
Fig.4. Disconnector switch RSN 24 s with turn-over operating mechanism type m1
RSN; Catalogue Eng. 2005; Page(s) 3/9
a) open position
b) ready to close
c) closing position
Fig.5. Disconnector switch RSN 24 s with energy storing operating mechanism type m2
Technical Characteristics
RSN 12
RSN 24
Rated voltage
12 kV
24 kV
Rated frequency
50 Hz
50 Hz
Rated power frequency withstand voltage (50 Hz) to the
earth and between poles
28 kV
50 kV
to the earth and
between poles
75 kV
125 kV
across insulating
distance
85 kV
145 kV
Rated current
630 A
630
Rated breaking capacity at cosφ>0,75
400 A
400
Breaking current of off-load transformer
10 A
7A
Rated making capacity (ampl.)
50 kA
6 kA
Short time withstand current 1s (Eff.)
20 kA
16 kA
Rated peak withstand current (ampl.)
50 kA
40 kA
Rated impulse withstand
voltage 1,2/50 µs
If the disconnector switch is equipped with HRC fuses, the rated current of the switch-fuse combination.
The breaking capacity of switch-fuse combination equals the breaking capacity of the fuse, in accordance
with IEC 62271-105.
RSN; Catalogue Eng. 2005; Page(s) 4/9
Type Designations
The type designations indicate the version of the disconnector switch, as well as its basic accessories. The
scheme of type designation generating is presented at Fig. 6.
RSN
●●
●
●●
●●
●●
Earthing blades:
Zg
Zd
at upper side
at lower side
Fuses:
Og
at upper side
Od
at lower side
Operating
mechanism:
m1
turn-over
m2
energy storing
Version (way of
installation):
n
b
(s)
Rated voltage
to the back cell
wall
to the lateral cell
wall
to the front cell
wall*
12 kV
24 kV
Basic series
designation
*on special customer’s request only
Fig. 6. Type designations of switch disconnectors series RSN
Additional Equipment
Besides the main accessories, which are visible from type designation (HRC fuses and earthing blades)
the disconnector switches can be equipped with the following:
- auxiliary switches for main blades as well as earthing blades (6-pole, 9-pole or 13-pole, as displayed at
Fig.7.)
- Voltage tripping release (available for secondary voltages 220V/50Hz; 110V/50Hz; 220V=; 110V=;
60V=; 48V= ; 24V=)
SNL VI bn
SNL IX en
SNL XIII fn
Fig.7. Auxiliary switches for disconnector switches series RSN – standard versions
RSN; Catalogue Eng. 2005; Page(s) 5/9
LEGEND:
SNL – Auxiliary switch
(see versions available at Fig. 7)
Oi – Tripping release (to be delivered on request)
Ti – Tripping push-button
(to be installed at site, by customer)
Fig. 8.
Tripping circuit for RSN with push-button and tripping release and auxiliary switch
type SNL VI bn
Installation and Operation Drives
Three types of drives can be used to operate disconnector switches series RSN (version n):
- manual toggle joint drives type S-5 and S-15
- electric motor drive type EMP-20
- air-blast drives type Zp 8/9 or Zp 10/13 (today almost not in use).
Drive
Toggle joint
Air-blast
S-5
Disconnector switches series
RSN – main blades
m1
x
m2
Earthing blades
S-15
x
x
x
EMP 20
x
x
x
x
Zp
10/13
Zp 8/9
x
x
Disconnector switches intended to be built laterally are operated directly from the main shaft. Disconnector
switches intended to be built at the front cell wall are operated by operating regulation lever attached to the
main shaft.
Detail data regarding drives are available in separate catalogue.
Ordering Data
The full type designation (in accordance with Fig.6) containing the following data is required:
Rated voltage (12 or 24 kV)
Version (way of installation) – n, b or s
- Type of operating mechanism (m1 or m2)
- HRC fuses, at lower or upper side (Od or Og), if required
- Earthing blades, at lower or upper side (Zg or Zd), if required
Other data required:
- Auxiliary switches (in accordance with Fig.7) for main blades and earthing blades, if required
- Data regarding tripping release (secondary voltage) if required
IMPORTANT NOTE:
The following versions of disconnector switches are available as standard. (Any other only on special
customer’s request).
Rated voltage 12 kV
installation to back cell wall
(version n)
Rated voltage 24 kV
installation to lateral cell
wall (version b)
installation to back cell wall
(version n)
installation to lateral cell
wall (version b)
RSN 12 n m1 Zd
RSN 12 b Zd
RSN 24 n m1 Zd
RSN 24 b Zd
RSN 12 n m2 Od
RSN 12 b Od
RSN 24 n m2 Od
RSN 24 b Od
RSN; Catalogue Eng. 2005; Page(s) 6/9
Dimensional Drawings
Fig. 9.
Disconnector switches with turn-over mechanism m1, type RSN 24 n-m1, RSN 24 n-m1
Zd and RSN 24 n-m1 Zg
Fig. 10.
Disconnector switch with energy storing mechanism m2, type RSN 24 n-m2
RSN; Catalogue Eng. 2005; Page(s) 7/9
Fig. 11.
Disconnector switch with energy storing mechanism m2, type RSN 24 n-m2 Og
Fig. 12.
Disconnector switch with energy storing mechanism m2, type RSN 24 n-m2 Od
RSN; Catalogue Eng. 2005; Page(s) 8/9
Fig. 13.
Disconnector switch with turn-over mechanism m1, type RSN 12 b-m1 Zd
Fig. 14.
Disconnector switch with energy storing mechanism m2, type RSN 12 b-m2 Od
All data in this catalogue are subject to change. Obligatory drawings and technical data we provide on
request.
KON^AR
KONČAR – ELEKTRIČNI APARATI SREDNJEG NAPONA d.d.
Borongajska bb, 10000 Zagreb, Hrvatska
Tel. + 385 1 23 34 867; Fax. + 385 1 23 31 058
e-mail: prodaja@koncar-easn.hr
RSN; Catalogue Eng. 2005; Page(s) 9/9