SF6 GAS INSULATED METAL
ENCLOSED SWITCHGEAR (GIS)
About company
The «Elektroapparat» plant starts its operation in
1922 as a plant manufacturing high-voltage electrical
equipment.
During the first two years of its existence the Plant
was producing oil-filed circuit breakers, indoor and
out door switches, current transformers, and other
equipment for currents in the range of 3 to 35 kV.
By 1928, the company had produced more than 100
types of equipment up to voltage 120 kV.
The 1950-ies saw the production of shunting devices,
measuring transformers and 800 kV circuit breakers.
GIS developing department was organized in 1976.
First 110-220 kV GIS appeared in 1979.
In 1982, the first deliveries of GIS were made on energy
facilities of the USSR.
Futher development of the plant in the 80-ies was
connected with the beginning of production of
generator sets 15,75-24 kV and 110-1150 kV SF6
switchgears and current transformers.
SF6 GAS INSULATED METAL
ENCLOSED SWITCHGEAR (GIS)
«Elektroapparat» is one of the oldest companies in the
world that continues to move forward...
Elektroapparat GIS provide maximum reliability
The JGT-145 includes the main technological equipment of substation such as disconnectors,
earthing switchs, circuit breakers, current and voltage transformers, surge arresters, combined in a
grounded metal enclosure filled with SF6.
Reliability
The main sections of the switchgear enclosed in a metallic sheath, so the device is not susceptible
to contamination from the environment, climate and aging insulators over time. JGT-145 passed
the whole test cycle to confirm their reliability and uptime.
Efficiency
JGT-145 meets all the requirements, which are critical to modern high-voltage equipment for
power and reliability. All keys components are easily accessible and simplify activities such as
gas handling, meter reading of gas density, or the initiation of manual operation.
Convenience
Delivery of fully assembled at the plant cells, greatly reduces the effort required for on-site
installation, only need to connect flanges modules. After that, the Client is required only run a
cable or air connection to the cell. Thus, GIS can be easily installed without significant outages.
Safety
Due to the extremely low level of noise and electromagnetic radiation, it can be installed in
close proximity to areas sensitive to electromagnetic radiation, residential areas, as well as intraurban areas. This type of GIS is an environmentally friendly high-voltage switchgear. All details
of the switchgear under voltage, enclosed in a grounded enclosure, providing enhanced security
personnel.
GIS of company «Electroapparat» became synonymous with reliability and trust of customers
around the world
Introduction
The present technical manual is applied to a JGT-145 type three-pole SF6 bay (hereinafter, «bay»)
and intended for acquaintance with technical characteristics, design of a bay, and also design and
principle of operation of assembly units included in a bay structure, and contains the information
necessary at assembly, transportation and storage of a bay.
Function
The bay is intended for operation in GIS on reception and distribution of an electrical energy in
three-phase a.c. networks of frequency 50 Hz with an earthing neutral (earth-fault factor 1,4) of
rated voltage 132 kV in normal and emergency conditions (performing of switching operations,
measurements and protection).
The bay is intended for operation in the following environmental conditions:
- in macroclimate areas with moderate or cold climate
- for indoor operation in heated or cooled and ventilated premises (without air conditioning);
- working values of air temperature during operation:
upper value - plus 40 ºС;
lower value - plus -30 ºС;
- altitude above sea level - no more than 1000 m;
- operating position of the bays– on a horizontal plane;
Name of parameter
Rated voltage, kV
Maximum operating voltage, kV
Rated frequency, Hz
Rated current, А:
busbars
taps
Peak withstand current, kA
Rms value of short-time withstand current, kA
Short-time withstand current, kA
Current duration (short circuit time), s
SF6 leakage per year, % of SF6 mass, no more
Height, mm
Width (with a pass / step), mm
Depth (length), mm
First major inspection, years
Expected lifetime, years
Ambient temperature range, ºС
Earthquake resistance, MSK
Mass, kg
Norm
132
145
50
3150
2500
100
40
40
3
0.5
2450
1600
3450
25
50
-30 to +40
9
3600
Bay design
The bay consists of three identical poles, busbar
sections, drive of the circuit breaker, drives of
disconnectors (one per three poles) and earthing
switches (one per three poles) and hardware cabinet.
The pole of a bay consists of assembly units: the circuit
breaker with a current transformers, bushing unit,
bus disconnectors’ unit, and cable connection unit.
Due to a modular construction of the GIS we can
produced all GIS upon customer requests.
All inner mechanisms and current-carrying parts of
the bay elements are enclosed in grounding gas-tight
aluminium enclosures.
Epoxy insulators are installed between enclosures
to separate the volumes. The insulators are used for
supporting current-carrying parts of the bay and
provide an insulation of alive parts from the grounded
enclosures.
For convenience of operation and disassembly in
service the pole of a bay is separated by the hermetic
insulators on 4 sealed, isolated from each other
spaces: the circuit breaker with a current transformer,
bushing unit, bus disconnectors’ unit and busbars.
The hermetic insulator is installed between an
enclosure of a current transformer and an enclosure
of a bushing unit and separates these two spaces with
different pressure, the second hermetic insulator is
installed between an enclosure of the circuit breaker
and the bus disconnector unit, separating also the
spaces with two different pressures, and the third
hermetic insulator is installed between an enclosure
of the bus disconnector unit and expansion bellows
and separates the spaces with an identical pressure.
The separation of spaces of bus disconnectors and
busbars is necessary owing to the service conditions
for a possibility of disassembly of one of buses, without
pressure release of the other.
The SF6 in the components of a bay is a main insulating
and heat removal element, and in the circuit breaker,
moreover - an arc-extinguishing one.
Each volume is supplied with valves and gas density
monitors with temperature compensation, for pressure
control. The availability of valves allows to fill in and
to bleed the hermetic spaces separately from each
other. All isolated spaces are supplied with the safety
rupture disc for protection against pressure increase
in an enclosure in case of an internal flashover.
The grounding system of a bay, built-in in GIS,
is designed so, that the elements of a grounding
system are located in a bay and are connected with a
grounding mat of GIS.
For ensuring of the grounding all enclosures of
the bay components are electrically connected
among themselves (by the fit of flanges of adjacent
components «metal-to-metal» and mounting of buses
shunting the bellows compensators) and grounded.
General view
1. Disconnector drive
2. Disconnector/earthing bay
3. Earthing drive
4. Current transformer
5. Gas density monitor
6. Three-phase busbar
7. Circuit-breaker drive
8. Supporting metal
9. Circuit-breaker bay
10. Three-phase busbar
GIS bays
Circuit-breaker
Circuit-breakers of Elektroapparat with auto-puffer interrupters have a simple principle of arc
extinction and simple design. The energy required for interrupting short circuit currents is
partly taken from the arc itself, significantly reducing the energy required from the operating
mechanism. Lower operating energy inherently reduces mechanical stresses, on the circuit
breaker itself as well as on the foundation, and increases circuit breaker reliability.
Current transformer
The ring core current transformers concentrically enclose the primary conductor. The core
support is provided by the pressure-proof enclosure, which is insulated from the basic flange
to prevent the return current from passing through the cores.
Voltage transformer
The Voltage transformers are based on the electro-magnetic transformer principle, where
primary and secondary wibdings are galvanically separeted from one another. The singlepole inductive voltage transformers are connected to the switchgear with a standardised
connecting flanfe and a partition insulator. Main features of voltage transformer are high
secondary output and accuracy, no ferroresonance possible in absence of circuit-breaker
grading capacitors.
Disconnectors and earthings
Disconnectors mute the individual sections of the electrical circuit, after loading on this
section turned off by the circuit-breaker. The three position disconnector and earthing switch
uses casted aluminium shell structure which is less weight, smaller size and can be operated
electrically or manually.
The fast-acting earthing switch
The fast-acting earthing switch is used to earth insulated sections of the installation to
protect personnel during overhaul and assembly work. But it’s also employed for earthing
capacitance (cables, transmission lines, etc.). The earthing switch can be mounted at any
position by using a linear connection element, thus ensuring the greatest flexibility in
switchgear layout.
Important issues
Transportation
GIS JGT-145 is optimized for transport and on-site installation. Thanks to their outstanding
compactness, even larger units for high voltage levels are still easy to handle. Most switchgear can
be shipped as completely assembled and tested bays pre-filled with SF6 gas. JGT-145t types are
even shipped in standard containers. Up to three single switchgear bays, completely assembled
and tested, come as a single transport unit. All goods are packed according to their specific
transport conditions and in line with conditions and duration of temporary storage.
Installation and commissioning
The well-thought-out transport optimization significantly reduces the effort required for
installation on-site and allows easy and rapid installation of the switchgear with relatively few
special tools. After assembly, the entire switchgear is tested to ensure proper electrical and
mechanical function. All tests are performed in conformity with IEC and all other relevant
standards, and the results are documented in the final test reports.
High degree of adaptability
To meet individual requirements, JGT-145 can also be equipped with any other commonly
available bay and substation control and protection system as well as with proprietary systems.
Standard switchgear control interfaces enable the connection to any analog or digital control,
protection, and monitoring system. Additional sensors and interfaces for a wide range of
diagnostic and condition monitoring systems and purposes are available on request.
For more information, please contact
our Customer Support Center.
Tel: (812) 677-83-97
(812) 677-83-93
Fax: (812) 677-83-90
Subject to change without prior notice. The information in this
document contains general descriptions of the technical options
available, which may not apply in all cases. The required technical
options should therefore be specified in the contract.
OJSC HV «Elektroapparat»
Manufacturer HV equipment
199106, Russian Federation,
St. Petersburg, 24th linija of VO, 3-7
Tel: (812) 677-83-83
Fax: (812) 677-83-84
E-mail: box@ea.spb.ru
Web:ea.spb.ru