Power Frequency AC Resonant Withstand Voltage Test Set , For EHV
CVT and CB Rutine Testing
I. Product Description :
CHX-(L) series HV induction regulation series resonance test system
is mainly used for power frequency voltage withstand test of HV
voltage electrical equipment ,special for quality testing of
science research and power equipment manufacturer.Compared with
traditional power frequency test transformer system with the same
specification, this kinds of test system needed power supply
capacity for test system
is smaller, waveform distortion smaller, higher Q value, smaller
size, wider range of test objects.
II. Appication object
- AC hipot routine test for GIS,CT ,circuit
breaker,bushing,insulator,insulating tools,busbar with voltage
class no more than 500KV.
- Can perform PD detecting test during voltage rise up when equipped
with Partitial discharge tester.
- AC hipot routine test for GIS, CT, breaker, casing pipe,
insulators, insulation tools, bus and so on with voltage of above
110kV
III. Main Components:
- Resonance Control console
- Electric voltage regulator cabinet
- Excitation transformer
- Variable inductance reactors with modular type
- Coupling voltage divider
IV. Key features
- The test power source,capacitor,size and weight needed are just 10%
that of conventional test transformers
- High quality factor and test automation degree, complete protection
function of over current,over voltage and flash-over
- ldeal test waveform, little waveform distortion
- Infinitely variable control induction used by reactor, complex
resonance can be reached at any point of in testing range.
- The reactor is equipped with reliable air gap limit switch and air
gap indicator scale and sensor, inductance gap of iron core can be
read directly on controlling panel.
- The reactor returns to air gap initial position after test
finished.
- Phase sequence backup protection is installed in transmission gear
which will prevent from damage.
- PD free designing of the system, small quantity of partial
discharging itself.
V. General Technical data:
- Mode of resonant circuit: Series resonant with variable inductance
- System model : made by order
- Input power supply : 380±10%(single-phase),50Hz/60Hz
- Rated output capacity: made by order
- Rated output Voltage:no more than 800KV
- Rated output current: made by order
- PD level itself: no more than 10pC
- 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
VI. 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.
VII. 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.
VIII.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 .
IX. Optional model
Model | Rated voltage | Rated output current | Rated output capacity | Application for turbine generator or thermal power generator |
CHX-L-1000KVA/500KV | 500KV | 2A | 1000KVA | For 145KV and below CB or CVT |
CHX-L-1200KVA/600KV | 600KV | 2A | 1200KVA | For 252KV and below CB or CVT |
CHX-L-4000KVA/800KV | 800KV | 5A | 4000KVA | For 500KV and below CB or CVT |
Special requirement can be made by order |