6. Generator Manufacturer
Successful Manufacture Experience
Harbin Electrical Machinery Company Ltd. (HEC) is a large modern
enterprise in manufacturing industry of generator equipment. HEC has
manufactured many large hydro generators which involves Three Gorges,
Xiluodu, Xiangjiaba, LIUJIAXIA, Gezhouba etc. HEC has manufactured
world-famous Three Gorges project generator and has manufactured stator
frame, rotor spider, upper and lower bracket, etc. So HEC has abundant
experience of manufacturing hydro-generator.
7. Generator Manufacturer
No. Power station name Product model
Power station
location
Installed capacity
of power station
1
three gorges（right bank）
SF700-80/19760
Hubei, China
4×700MW
2 three gorges
（underground）
SF700-80/19760
Hubei, China
2×700MW
3
Longtan
SF700-56/16090
Guangxi, China
7×700MW
4
Laxiwa
SF700-42/13770
Qinghai, China
5×700MW
5
Xiaowan
SF700-40/12770
Yunnan, China
6×700MW
6
Xiluodu
SF770-48/15300
Yunnan, China
6×770MW
7
Xiangjiaba
SF800-80/20400
Yunnan, China
4×800MW
10. Generator Structure
The generator is vertical shaft, suspension type,
enclosed self-circulation air-cooling, three phase and
salient-pole synchronous generator
The generator includes stator, rotor, thrust bearing，
upper guide bearing and upper bracket, lower guide
bearing and lower bracket, air cooling system, braking
and jacking system, fire distinguishing system, lighting
and cover, foundation embedded parts, piping, cables,
etc. necessary auxiliary accessories.
11. Stator Structure
The stator is consisted of stator frame, Stator core and
windings etc
12. Stator Core and Bar
The stator core will use 0.5 mm thickness, low loss, high permeability,
non-aging, first quality, cold rolled, non-orient silicon steel sheets to
laminate into a complete circle at the work site.
The stator bar is consisted of double fiber glass wrapping wire through
307.06° incomplete transposition. After forming a whole body by heat
pressing, F class epoxy powder mica fiber glass tape will be continuously
wrapped as the insulation to the ground. The surface will use the fiber
glass tape coated with the semi conductor paint as anti-corona layer.
13. Rotor Structure
The rotor is consisted of rotor poles， rotor rim, rotor
spider and shaft etc.
14. Pole Core and Winding
The rotor pole core is made of 2 mm thickness, high
strength WDER450 steel sheets and fixed into one body
with bolts.
Reliable stacking and pressing technology is adopted to
assure the pressure between sheets and the wholeness.
The poles are connected to the rotor rim With T tail.
The pole winding is made of rectangle copper bars. The
insulation between turns is F class. The upper and lower
ends of rotor winding adopt F class one-body insulating
support plates.
18. Transformer
A power transformer normally consists of a pair of
windings, primary and secondary, linked by a
magnetic circuit with core. When an alternating
voltage is applied to one of these windings, generally
by definition the primary, a current will flow which sets
up an alternating m.m.f. and hence an alternating flux
in the core. This alternating flux in linking both
windings induces an e.m.f. in each of them.
19. Transformer
In the primary winding this is the ‘back-e.m.f.’ and, if
the transformer were perfect, it would oppose the
primary applied voltage to the extent that no current
would flow. In reality, the current which flows is the
transformer magnetising current. In the secondary
winding the induced e.m.f. is the secondary open-
circuit voltage. If a load is connected to the secondary
winding which permits the flow of secondary current.
21. Fig 1.1 Transportation of Main Tank
Fig 1.2 Offload Main Tank by Jack and
Rail
1.1 Offload Main Tank
Offload, Jack and Slide The Main
Tank
Turn
Table
Rail
22. Offload, Jack and Slide of Main
Tank
Fig 1.4 Turn Main Tank on the Table
Fig 1.3 Slide the main tank onto the pad
1.3 Slide, and Turn the Main Tank around
Turn Table
Hydraulic
Jack
23. Damping Rubber
Offload, Jack and Slide of Reactor Main
Tank
Fig 1.6 Set Up Main Tank on the Pad
Fig 1.5 Assemble Anchor Bolts
1.4 Fixing Main Tank on the foundation
Fig 1.7 Twelve Pieces of Damping Rubber
24. OFFLOAD, JACK AND SLIDE OF
REACTOR MAIN TANK
1.4 Fixing Main Tank on the foundation
Fig 1.7 Welding Bottom Rim of Main Tank
to the Metal Frame
Fig 1.8 Welding Bottom Rim of Main Tank
to the Embedded Iron of foundation
Welding
Line
Bottom Rim of Main
Tank
25. Tank Bottom Valves
Fig 2.1 Inspect Main Tank Visually
No Bump, no paint loss, no oil
leak
Conduit Protection of
Cabinet
2.1 Appearance Inspection of Main Tank
INSPECTION OF MAIN TANK
26. INSPECTION OF MAIN TANK
Low Pressure Gauge( ≥ 10
kPa)
N2 Cylinder and Pressure Gauge
Fig 2.2 Main Tank on Temporary Pad Fig 2.3 The Pressure reading in Main Tank
2.2 Pressure Inspection of Main Tank
Internal pressure of main tank: ≥ 10 kPa
27. Fig 2.4 Coordinate Axis of Impact
Recorder
INSPECTION OF MAIN TANK
Fig 2.5 Impact Recorder on Top of Main
Tank
Fig 2.6 Operation of Impact Recorder Fig 2.7 Impact Values
2.2 Impact Record Print
28. INSPECTION OF MAIN TANK
Fig 2.8 Megger Tests of Core and Clamp
Core –G ： ≥ 300MΩ
Clamp - G： ≥ 300MΩ
Core-Clamp：≥ 300MΩ
2.3 Insulation Resistance Test of Core and Clamp
29. INSPECTION OF MAIN TANK
Fig 2.9 Dew Point Test Fig 2.10 Dew Point Value
2.4 Dew Point Test
perform the dew point test, and the moisture in insulation: ≤
0.8%
30. INSPECTION, STRUCTURE AND TEST OF
TURRET
Fig 3.1 CT Assembly in Turret
Fig 3.2 CT Position in
Turret
3.1. Turret Visual Inspection:
a. CTs without Movement or Deformation;
b. Insulating Plates should be pressed firmly, no
looseness.
CT
CT Insulating Plates Position of Insulation and CTs
31. 3.1. Turret Visual Inspection:
c. Insulation cylinder or shielding ball should be in good
condition.
Fig 3.3 Insulation cylinder and shielding of HV
Turret
Fig 3.4 Insulation cylinder of LV
Turret
Insulation cylinder
INSPECTION, STRUCTURE AND TEST
OF TURRET
Shield Ball
32. 3.2. CT Test Program:
a. Ratio;
b. Saturation Curve;
c. Polarity;
d. DC Resistance of Winding;
e. Insulation
Resistance(1000V)
Fig 3.6 CT tests in turret
INSPECTION, STRUCTURE AND TEST OF
TURRET
33. INSPECTION AND TEST OF
BUSHINGS
4.1. Bushing Visual Inspection:
a. There is no oil leak on the bottom of crate.
b. Porcelain without crack or damage.
Fig 4.1 Open crate to inspect
bushing
34. Test Items
• Oil test
• Bushing test
• CT test from cabinet;
• DC Resistance of windings with bushings;
• Insulation resistance (Core-G, Clamp-G, Core-Clamp)
• Dielectric power factor of winding insulation system;
• Other general test items specified in the contract and
other technical agreement.
ACCEPTANCE TEST ON SITE
35. ENERGIZATION AND MAINTENANCE
Inspection before Energization
Energization
The reactor can be energized after all inspections; and the product is deemed to
put into service officially.
Inspection Items before Transformer Energization
Item Inspection & Check Points Example
1 All the grounding points should be grounded reliably. Main tank, Neutral bushing, core and clamp.
2 All the valves are in correct Open/Close status. Butterfly valves of radiators, equalizer valve.
3 There should be no oil leakage.
4 All the valves are in correct Open/Close status. Butterfly valves of radiators
5 Oil level indication. Conservator, bushings
6 Dehydrate breathers Color of Silica Gel
7 Reports of Transformer and System Commissioning.
8 External Insulation Distance
40. Electrical Maintenance
Clean the electrical control cabinet and mechanical
cabinet every two weeks, to remove dust, dirt and
other debris on the device surface;
Check the governor system sensor, and to check
whether it is loose or has other abnormal phenomena
every four weeks;
Check terminals and wiring of all the components
each minor repair;
Check the sensor signal of the governor system
each minor repair;
Check all the instruments each minor repair.
41. Maintenance of Mechanical Equipment
Switch the oil filter every 4 weeks
Replace filter element of the oil filter per year;
Filter hydraulic oil of the speed control system and analyze its chemical quality
per year
Replace hydraulic oil of the speed control system
Check the firm situation of the adjusting nut during open and closing time every
four weeks
Check the firm situation of the adjusting nut of the segmented closing every
four weeks;
Check segmented valve and segmented device each minor repair;
Check main control valve median of the governor mechanical hydraulic system,
and the open and shutoff time of servomotor each minor repair;
Check whether the emergency stop solenoid valve is operating normally each
minor repair.
42. Test for Governor System
Test without water
i. Oil filling Test
ii. Movement Test
iii. Time Setting
iv. Leakage Test
v. Transducer Signal Check
vi. Switchover Test
43. Test for Governor System
Test with water
i. First time Startup Test
ii. No load frequency swing test
iii. Load Rejection test
iv. Switchover Test
v. Simulative fault Test
44. Fire Fighting System
Automatic fire detection and alarm system is installed in the hydropower
station, control building, administration building, 11kv substation, power-
house and water inlet structure. The system is a smart controller based
on the analog fire detection and alarm system. The area of hydropower
station, control building, administration building, 11kv substation, power-
house and water inlet structure is covered with two independent alarm
systems. All independent systems are connected to the main controller of
fire protection in the control room via cable and optical fiber cable, and
transformer room and generator are separately connected to the fire
alarm and extinguishing system of main controller of fire protection of
hydropower station control system.
45. Fire Fighting System
It is made up of temperature sensors, smoke
sensors, the fire alarm device and carbon dioxide
bottle groups. The sensors can send the signals to
the fire alarm device. Then the fire alarming device
can be control the carbon dioxide bottle groups to
actualize putting out the fire and gives out the alarm
signals to remote control system.
