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ISO 9001: 2000
Circuit
Breakers
Switch
Disconnectors
Disconnectors
Earthing
Switches
Operating
Devices
Accessories
MARK40
Vertical break disconnector
123, 245 and 420kV / 2500-4000A
Catalogue No 01.04.02.EN
1. APPLICATION.
Outdoor disconnectors switches type MARK40 are designed for application in the outdoor switchboards of high voltage.
Disconnectors are used for metallic isolation systems by creating in open position a visible isolating distance. They are appropriate
for switching small currents or currents when no significant change in voltage occurs across the terminals and can be operated in
many types of high voltage switchgears. For earthing and short-circuiting disconnected plant section, each disconnector pole can be
equipped with one or two earthing switches.
2. CHARACTERISTIC FEATURES.
· good technical parameters;
· quick assembling and easy to adjustment;
· good anticorrosive cover (hot-dip zinc coating or stainless steel);
· motor operating mechanism mounting under each disconnector pole possibilities;
· high durability and reliability (2000 cycles);
· insulator deflection compensation possibilities;
3. DESIGNATIONS OF DISCONNECTOR TYPES.
MARK40
245 /
Rated voltage
- 123kV
- 245kV
- 420kV
2500/
Rated current:
- 2500 A
- 3150 A
- 4000 A
UP
Earthing switch type
- UL (constant contact head side)
- UP (disconnecting head side)
An example of an order A:
Single pole disconnector switch type MARK40-245/2500/UP; 245kV, 2500A, 125/50kA with one complete of earthing switch at
disconnecting head. Equipped with two motor operation units type NSO80 and insulators type C6-1050 with leakage path 25mm/kV.
An example of an order B:
Triple pole disconnector switch type MARK40-420/4000; 420kV, 4000A, 125/50kA without earthing switch. Equipped with motor
operation unit type NSO80 and insulators type C8-1550 with leakage path 25mm/kV.
4. SERVICE CONDITIONS.
Disconnecting switches type MARK40 are meant for operation outdoors in following parameters:
· Ambient temperature:
314K (+40°C)
· maximum
up to 308K (+35°C)
· average (over 24 h)
228K (-45°C)
· minimum
up to 1000 m
· altitude above the sea level
up to 700 Pa
· wind pressure
up to 10 mm
· ice coating
100%
· highest relative air humidity
5. COMPLIANCE WITH STANDARDS.
Disconnector type MARK40 is outdoor vertical-break switches with two fixed and one rotating insulator column. They are
manufactured in individually motor driven single-pole version. Triple-pole version is equipped in three motor-driven, where one
works as a master. The framework is made from hot galvanized square profiles.
The main circuit of a disconnector incorporates two contact heads with flat terminals and moving knife, made of aluminium tube.
Both ends of the knife are fitted with silver-plated contact plates which form contact with springy silvered contact bars of the head.
During final phase of closing the knife makes a rotation about the longitudinal axis. Both contact heads and the free-end of the
contact knife are provided with suitable corona-shields.
The main circuit of the earthing switch comprise a fixed tulip-like contact fastened to the contact head and a tubular aluminium
knife. The knife is connected by means of flexible earthing lead and the bracket of operating mechanism with the post of supporting
structure, provided with the earthing terminals. The moving parts of the operating mechanism and the operating mechanism are
electrically separated from the main circuit so that they are prevented from carrying short-circuit current.
During closing operation, the earthing knife ended with a spherical contact, first swangs out to vertical position and next, inserts
axially into the tulip like contact on the contact head. The bars of tulip like contact are self-springing and shaped so as to assure a
considerable increase of contact pressure due to the electrodynamics action of short-circuit currents. The operating mechanism of
the earthing switch crosses the dead points in both extreme positions, preventing inadvertent opening or closing of the knife due to
some external forces. The contact head is ended with the flat terminal which enables connection of both flexible (cable) and rigid
(tubular) conductors leads. It is also provided with suitable corona-shields to reduce radio interference level.
Page 2/8
ZWAE Sp. z o.o.
THE MAIN CIRCUIT
CORONA-SHIELDS
FLAT CONNECTION
ROTATING INSULATOR
FIXED INSULATOR
Constant contact head view.
CORONA-SHIELDS
THE MAIN CIRCUIT
CONTACT SYSTEM
Disconnecting head view.
6. TECHNICAL DATA.
No.
1.
Designation
Value
Rated voltage
123 [kV]
245 [kV]
420 [kV]
2.
Rated normal current
2500 [A]
3150
[A]
800 [A]
4000 [A]
2500 [A]
3150
[A]
800 [A]
4000 [A]
2500 [A]
3150
1600 [A]
4000 [A]
3.
Rated peak current
125 [kA]
125 [kA]
125 [kA]
4.
Rated short-time current (1 sec.)
50 [kA]
50 [kA]
50 [kA]
5.
Rated power-frequency (50Hz) withstand voltage:
- to earth
- across the isolating distance
230 [kV]
265 [kV]
460 [kV]
530 [kV]
520 [kV]
610 [kV]
6.
Rated switching impulse withstand voltage:
- to earth and between poles
- across open disconnector
550 [kV]
630 [kV]
1050 [kV]
1200 [kV]
1425 [kV]
1425 (+240) [kV]
<2500 [uV]
<2500 [uV]
<2500 [uV]
2000 cycles
2000 cycles
2000 cycles
NSO80
NSO80
NSO80
8.
Radio noise voltage
9.
Rated mechanical endurance
10.
Operation mechanism
ZWAE Sp. z o.o.
Page 3/4
7. DIMENSIONAL DRAWINGS OF MARK40.
C
D
B
A
UP
UL
Rated voltage [kV]
123
245
420
A [mm]
1220
2300
3350
B [mm]
1580
2641
3691
C [mm]
3320
6686
8386
D [mm]
1285
3200
4200
The manufacturer reserves the right to introduce some modifications owing to technological progress.
Zak³ad Wytwórczy Aparatów Elektrycznych Sp. z o.o.
ul. Gdañska 60; 84-300 Lêbork
Tel.: (059) 86-336-15; Fax: (059) 86-333-86
e-mail: [email protected]
www.zwae.com.pl