This document provides information about Xian Electric Import & Export Co., Ltd., including their SF6 gas-insulated metal-enclosed switchgear products ranging from 72.5kV to 550kV. It discusses the company's manufacturing capabilities and certifications. The document also provides specifications and ratings for their 550kV GIS switchgear products, including circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, and busbars. Diagrams are included showing the construction and components of the 550kV GIS switchgear.

1. differentiation
New publication, effective Jan. 2003
Xian Electric Import & Export Co.,Ltd.
No.20 Laodong Road, Xian 710082, Shaanxi,China
Tel: +86 29 8631701/8631757
Fax: +86 29 8623631
E-mail: xemc@xianelectric.com
http://www.xianelectric.com

2. SF6 GAS-INSULATED
METAL-ENCLOSED SWITCHGEAR
72.5kV~550kV GIS
Xian Electric Import & Export Co.,Ltd.
A Member of China Xian Electric Group

3. China Xian Electric Group ( XD for short ):
XD is the largest base for manufacturing complete sets of ultra-high voltage AC transmission
and transformation equipment in China.
XD is the largest base for manufacturing complete sets of ultra-high voltage DC transmission
and transformation equipment in China.
XD is the largest base for researching and developing complete sets of ultra-high voltage AC &
DC transmission and transformation equipment in China , and is appointed by the state as the
national profession center responsible for the quality supervision, examination and test.
XD is the largest base for exporting complete sets of ultra-high voltage AC & DC transmission
and transformation equipment in China.

4. Main Products
550kV GIS 1
550kV HGIS 9
363kV/300kV GIS 13
252kV GIS 19
145kV/126kV/72.5kV GIS 27

5. 550kV GIS
1. 550kV GIS for Tiansheng Bridge Hydraulic Power
Station, China; 1990
2. 550kV GIS for Wu Qiang Xi Hydraulic Power Station, China;
1994
1
3. Factory assembly of a 550kV GIS
4. Three Gorges 550kV GIS Buses under Insulation Test
5. Three Gorges 550kV GIS Circuit Breaker under lnsulation Test 2

6. 550kV GIS has an integral phase-separated construction to facilitate its operation and maintenance at site.
This GIS is rational, simple and compact in construction, excellent to withstand seismic movements/earthquake
and wide application to meet the requirements
of various arrangement modes of 550kV GIS.
The GIS is also applicable to outdoor
arrangement.This GIS consists of circuit breaker,
disconnector, earthing switch, current
transformer, voltage transformer, lightning
arrester, buses, bushings and related external
system wherein local or remote operations and
fault alarm can be integrated.
3
1 2
FEATURES
1 Stable breaking properties
The circuit breaker has a large breaking capability of 67-70kA, holding a lead advantage against same
domestic type of products. The energy of arc and effect of turbulent flow have been considered and researched
properly in the design of the arc chamber to strengthen the arc blowing ability of nozzle. The self-reliance
contacts are used without any springs to be more reliable in electric contacting. The arc contacts are made
of copper and tungsten integrality so that no dislodgement happens. There are only a few parts inside the arc
chamber, as a result, it has a stable working property.
2 Reliable operating mechanism
The opening by pneumatic force and closing by spring force are used in the operating mechanism of the
circuit breaker. It is characterized by simple construction, rich experience of operation and convenient
maintenance. This mechanism has been supplied by one of the XD-Mitsubishi joint-venture enterprise in
Xian, China, which specially manufactures various types of arc chambers and operating mechanisms for
both Mitsubishi and XD.
5
Typical 1 1/2 arrangement of 550kV GIS
4

7. 3 High insulating reliability
The insulating spacers, tubes, levers and insulating desks etc for the GIS are made with casting machines
from Germany and under the chemical direction and production processing from Mitsubishi. The power
frequency withstand test and partial discharge test have been done on those parts and the values of the
partial discharge are lower than the requirements by IEC.
4 Perfect assembling and testing conditions and minimum work at site
The GIS is assembled and tested against similar conditions of assembling site, packed in transport unit after
tested, for easy and convenient transport and minimizing work at site.
5 Lower leakage of SF6 gas
The mode of separated monitoring is used in the SF6 gas system of GIS, doing away with SF6 valves and SF6
piping system. New self-sealed adapters and SF6 gas densimeters are used to get rid of the possibility of SF6
leakage outside the GIS, lowering the SF6 gas leakage.
RATINGS
Main Technical Data for 550kV GIS ( Based on IEC )
Item Unit
Ratings
550kV
Remarks
Installaton
Ambient temperature
Humidity (per month)
Height above sea level
Wind velocity
Earthquake intensity
Creepage distance
Rated voltage
Rated current
Rated short-time withstand current (3s)
Peak withstand current
Lighting impulse withstand voltage(peak)
Power frequency withstand voltage(r.m.s)
Rated SF6 gas pressure(exclusive of CB)
Annual leakage rate of SF6 gas
General data
%
m
m/s
g
cm/kV
kV
A
kA
kA
kV
kV
MPa
%
Indoor or outdoor
-30~40
90
1000~3000
35
1.7, 2.1, 2.5
550
At 25
Accelerated
simultaneously
Calculated to
rated voltage
3150/4000
50/63
125/160
1550
680
0.4
1
1 min
20
Applied ambient
conditions
Horizontal acceleration: 0.15, 0.3
Vertical acceleration: 0.0075, 0.15

8. 3 4
Rated current
Rated dreaking current
Rated short-time withstand current (3s)
Peak withstand current
Full breaking time
Rated operating duty
First-pole-clean factor
Operating mechanism
Rated current
Rated short-time withstand current (3s)
Operating mechanism
Rated short-time withstand current (3s)
Operating mechanism
Rated current
Type of enclosure
Material enclosure
Material conductor
Rated current ratio
Capacitive
Accuracy
Rated primary voltage
Rated secondary voltage
Rated burden
Type
Rated voltage
Normal discharging current
Busbar
Current transformer
A
kA
kA
kA
ms
A
kA
kA
A
VA
kV
V
VA
kV
kA
3150/4000
50/63
Pneumatic or Motor-spring
50/63
2000/2500/3150/4000
1 phase in 1 enclosure
Steel/Al.
Al.
15/20/25/30/40/50
Disconnector
550/ Ö3
100/ Ö3
75~300
Metal oxide-zinc
444
10
Earthing switch
Pneumatic or Motor-spring for FES
Manual or Motor for ES
Voltage transformer
Lightning arrester
300-400-600-750-1000-1200-1500-2000/5
Measurement: 0.2, 0.5;
protection:10P20, 5P20 TPY
1 The secondary winding can be supplied for measurement which rated secondary current is 1A.
2 For the higher accuracy of CT, please contact with us for further discussion.
Circuit breaker
3150/4000
50/63
50/63
125/160
40/50
O-0.3s-CO-180s-CO
1.5
Pneumatic or Hydraulic

9. SWITCHGEAR CROSS SECTION
4 1 4 2
2 8
Live parts
lnsulator
SF6 gas
Enclosures
8
8 8
8
8
8
7
8 4
7
3
3 3 7
8
8
2
8
10
9
500kV Scheme
Key
11
1 Circuit breaker
2 lsolator ( disconnecting switch )
3 Earthing ( grounding ) switch
4 Current transformer
5 Voltage transformer
6 Connecting chamber for transformer
7 Bellows
8 lnsulating spacer
9 Busbar
10 Bushing
11 Local control cubicle
12 Transformer