GPXZ-L Resonance Test System for Generator

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Introduction


As the development of the electric system, the capacity of the equipment more and more larger, for example, the capacity of single machine of the thermoelectric generator group is more than 1000MW, the capacity of single machine of the hydroelectric generator group is more than 800MW, if use traditional equipment (frequency test transformer) , need large capacity, test transformer, voltage regulator are very heavy, it is not convenient for field test. Serial resonant system is better than traditional equipment in power capacity, device weight, measured waveform and cost. It is special designed for the AC voltage withstand test for hydroelectric generator which its single machine capacity ≤250MW. 

Features


1.Because the resonant system is reactive power full compensated, the power of the equipment and power is only less than 1/10 of measured equipment; with smaller volume and lighter compared with the equipment in same capacity. The device with large output capacity and small power capacity, low cost, easy to operate and safe.
2.Serial resonant system actually is current filter circuit, make the current which through it be fundamental current, the output voltage distortion (THD) is very small, and better than all the AC voltage withstand equipment. 
3.The short circuit current after flashover or breakdown is only less than 1/10 (1/Q) of the measured current, can effectively prevent the damage to fault point after breakdown.
4.Auto blowout the arc after flashover, it is a long and stable process to recover the serial resonant voltage, safe.

Parameters



Rated output voltage

≤0~60kV(AC effective value)

Output frequency

50Hz

Resonate voltage waveform

Sine wave, distortion ≤1%

Working mode

Full power continuous working time: 1min

Quality factor

10~40

Maximum measured capacity

≤3000kVA

Power supply

380V±15%, frequency:50Hz

Serial product and application:

Model

Application (AC voltage withstand test for generator which voltage ≤20kVmeasured frequency: 50Hz)

Control cabinet

Regulator

Reactor(dry type)

Excitation transformer (dry type)

Divider

Application

GPXZ-L-
200/25

30kW

30kVA
(electric)

200kVA/25kV
adjustable 1 set

30kVA
(dry type)

30kV

Hydroelectric generator
0.4-1.0μF
(10kV/40MW)

GPXZ-L-
300/50

60kW

60kVA
(electric)

300kVA/50kV
adjustable 1 set

60kVA
(oil immersed)

50kV

Thermoelectric generator
0.27-0.33μF
(20kV/300MW)

GPXZ-L-
600/50

60kW

60kVA
(electric)

200kVA/50kV
adjustable 1 set
400kVA/50kV
adjustable 1 set

60kVA
(oil immersed)

50kV

Thermoelectric generator
0.113-0.45μF
(20kV/600MW)

GPXZ-L-
1200/50

120kW

120kVA
(inductive)

200kVA/50kV
fixed 2 sets
800kVA/50kV
adjustable 1 set

120kVA
(oil immersed)

50kV

Thermoelectric generator
0.6-1.8μF
(20kV/250MW)

GPXZ-L-
2750/55

300kW

300kVA
(inductive)

750kVA/55kV
fixed 2 sets
1250kVA/55kV
adjustable 1 set

300kVA
(oil immersed)

60kV

Thermoelectric generator
1.6-3.3μF
(20kV/770MW)


Note: make the solution according the measured equipment. 

Reference table for capacitance of common hydroelectric generator:

Category 

Parameters of the generator 

Rated capacity (MW)

Rated voltage (kV)

Phase capacitance (μF)

Hydroelectric generator 

72.5~85

10.5

0.694

125~150

 

1.8~1.9

300

15.75

1.7~2.5

400

18.0

2~2.5

600

 

2.1~2.5

 



Accessory



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