Power Frequency AC Resonant Withstand Voltage Test Set , For
Thermal Generators Test
I. Product Description :
According to the relevant test standards from IEC and IEEE, at the
time of overhaul or new erection of the generator , the stator winding of the large capacity thermal power generator
needs to conduct AC withstand voltage test at 50 or 60Hz power frequency.
AC resonant test set can be classified as variable frequency and
variable inductance resonant test system. Power frequency AC resonant withstand voltage test set for large
capacity thermal generators is tuned to resonance by regulating inductance. Large
capacity output on test object can be obtained by inputting small
capacity power supply and samll layout space through using the set.
So the test set is usually used for on-site AC withstand voltage
test and PD detecting HV source for power generator.The test set model CHX-350KVA/50KV is designed and used for
testing 600MW and below class thermal generators .
II. Appication
600MW and below thermal generators
100MW and below hydraulic generators
III. Main Components:
SN | Name of Components | Type and specification | Qty. | Each weight | Each Dimension |
1 | Resonance Control console | DCG-L-50KVA/380V | 1piece | 25kgs | 600*360*850mm |
2 | Electric voltage regulator cabinet | DT-50KVA/0~420V | 1piece | 300kgs | 600*500*1150mm |
3 | Excitation transformer | CQSB-50kVA/8KV | 1piece | 300kgs | 650*650*800mm |
4 | Variable inductance reactor | CHX(TL)-350kVA/50kV | 1piece | 1000kgs | 950*750*1400mm |
5 | Voltage divider | TRF-50KV | 1set | 5kgs | D170*H850mm |
6 | Special test accessories | | | | |
Note : Special requirement can be made by order. |
VI. General Technical data:
- Mode of resonant circuit: Series resonant with variable inductance
- System model : CHX-L-350KVA/50KV
- Input power supply : 380±10%(single-phase),50Hz/60Hz
- Rated output capacity: 350kVA
- Rated output Voltage:50KV
- Rated output current: 7A
- PD level itself: no more than 5pC
- Reg. Freq range : 50/60Hz
- Output Resonance voltage waveform: pure sine wave
- THD of output waveform: ≤1%
- Insulation level: Under 1.1 times and keeping 1min, normal
- Duty cycle : 30mins on under rated current working condition ;
- Quality factor of test set itself: Q≥30 ;
- Temperature rise: Less than 65K under rated current working
30mints;
- Noise level: No more than 65dB
- Reactor Structure: oil-immersed with iron tank type ,adjustable
inducatance
V. Technology Advantage
- 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.
- With large output capacity and small power capacity, low cost, easy
to operate and keep safe.
- Typical current filter circuit, the output voltage distortion (THD)
is very small
- 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.
- Auto blowout the arc after flashover, it is a long and stable
process to recover the serial resonant voltage, safe.
VI. Function
- Remote control and indication function for the iron-core gap
of reactor:The gap sensor is installed in the reactor, which directly reads
the iron-core gap on the console to guide operation. The gap
limiting switch and indicator are also installed.
- Auto step down function when withstanding time is up:Withstanding timing adopts digimatic timer. When withstanding time
is up, the system will auto step down.
- Zero position close, zero start step up function:With zero limiting function. If the voltage regulator is not at
zero position, then the HV output button cannot be closed, assuring
the system step up from zero.
- Over current protection:The system is with over current relay, which is of high anti
interference, fast action, protection test object against
over-current damage.
- Over voltage and test object flash-over protection functions:This system takes electronic over voltage and flash-over protection
board, protects test object against over voltage and flash-over. It
is fast, stable and reliable, overcoming the instability, large
discreteness and inconvenient adjustment of sphere-gap protection
voltage. The setting of over voltage protection is manual
adjustment, digital display, which is direct, convenient and
accurate. The flash-over protection samples the accident variance
of discharging signal falling delay, compares it with basic signal
and determines. It is of high accuracy, avoiding possible mistake
movement by accident variance of rising delay.
- Real-time monitor function for test data:It is able to monitor HV side voltage, current and LV side voltage,
current, which is more direct viewing the test status.
- Digital display of circuit resonance and locking function when it
is not of resonance and step up:
- It can directly display the resonance status of the system by power
factor. If the system is not at the resonant point, it must press
close button to step up. When the system is adjusted to resonance,
release the close button, click on the step up/down button to step
up or step down.
- Emergency stop :“Step on” emergency brake switch. Once there is abnormal
conditions during test, step on this switch, the main power will be
cut off right away to protect the safety of the testing personnel
and the equipment.
VII.Accessories
- Accessory box for storage accessoires
- Connection cables of control console and Voltage regulator
- Connection cables of voltage ragulator and exciting transformer
- Output cables of exciting transformer
- System grounding cables
- Parallel cables of the reactor
- HV output cables(reactor to divide,divider to test object)
- HV measuring cables ( the signal output cables of voltage divider )
- A final test report, a quality Certificate ,a user manual and a
packing list are offered .
VIII. Application Sale list
SN | Project Name | Rated capacity of generator | Typical model supplied of test set | Country | Order Qty. |
1 | Three Gorges Hydropower Station | 700MW Hydroelectric generator | CHX-L-2350KVA/55KV | China | 2set |
2 | Gezhouba Hydropower Station | 170MW Hydroelectric generator | CHX-L-1100KVA/40KV | China | 2set |
3 | Xiluodu Hydropower Station | 770MW Hydroelectric generator | CHX-L-2850KVA/55KV | China | 2set |
4 | Xiangjiaba Hydropower Station | 800MW Hydroelectric generator | CHX-L-3750KVA/65KV | China | 2set |
5 | Wudongde Hydropower Station | 850MW Hydroelectric generator | CHX-L-5100KVA/60KV | China | 2set |
6 | Baihetan Hydropower Station | 1000MW Hydroelectric generator | CHX-L-4800KVA/65KV | China | 2set |
7 | SON LA Hydropower Station | 400MW Hydroelectric generator | CHX-L-1125KVA/45KV | Vietnam | 1set |
IX. Optional model
Model | Rated voltage | Rated output current | Rated output capacity | Application for turbine generator or thermal power generator |
CHX-L-250KVA/50KV | 50KV | 5A | 250KVA | For 300MW and below generator stator |
CHX-L-350KVA/50KV | 50KV | 7A | 350KVA | For 600MW and below generator stator |
CHX-L-600KVA/50KV | 50KV | 12A | 600KVA | For 1000MW and below generator stator |
Special requirement can be made by order |
X. Test standard table from IEC60034-1:2017 Rotating
electrical machines - Part.1 :Rating and performance
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