ഉൽപ്പന്ന ആമുഖം
The series resonance test device is an electrical test device specifically designed for high-voltage equipment and systems. It usually consists of a resonant circuit, transformer, capacitor, etc. By connecting the resonant circuit in series with the tested equipment, the tested equipment is in a resonant state. In the resonant state, higher voltage can be generated with lower power input for insulation strength and withstand voltage testing.
Meet the test range
1, AC withstand voltage test for 10kV/300mm² cable 4.5km, capacitance ≤1.6897μF, test frequency 30-300Hz, test voltage 22kV, test duration 5 minutes.
2, AC withstand voltage test for 35kV/300mm² cable 2km, capacitance ≤0.389μF, test frequency 30-300Hz, test voltage 52kV, test duration 60 minutes.
3, AC withstand voltage test for 110kV/300mm² cable 0.5km, capacitance ≤0.0735μF, test frequency 30-300Hz, test voltage 128kV, test duration 60 minutes.
4, Full insulation AC withstand voltage test for 110kV/120MVA main transformer, capacitance ≤0.02μF, test frequency 45-65Hz, test voltage not exceeding 160kV, test duration 1 minute.
5, AC withstand voltage test for 110kV voltage level switch and other electrical equipment, test frequency 30-300Hz, test voltage not exceeding 265kV, test duration 1 minute.
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Main components of the device
| Serial number | ഉപകരണത്തിന്റെ പേര് | Specification and model | യൂണിറ്റ് | Quantity |
| 1 | Variable frequency power supply | UHV-18kW | Tower | 1 |
| 2 | ആവേശകരമായ ട്രാൻസ്ഫോർമർ | UHV-18kVA/4/8/16kV/0.4kV | Tower | 1 |
| 3 | High voltage reactor | UHV-67.5kVA/45kV | Section | 6 |
| 4 | Capacitive voltage divider | UHV-500pF/270kV | സജ്ജമാക്കുക | 1 |
Main technical parameters and functions
| റേറ്റുചെയ്ത ശേഷി | 405kVA |
| റേറ്റുചെയ്ത വോൾട്ടേജ് | 45kV；90kV；135kV；270kV |
| റേറ്റുചെയ്ത കറന്റ് | 9A；4.5A；3A；1.5A |
| അളക്കൽ കൃത്യത | System RMS level 1.5 |
| Operating frequency | 30-300Hz |
| Device output waveform | Sinusoidal wave |
| ഗുണനിലവാര ഘടകം | Device Q≥30(f=45Hz) |
| തരംഗരൂപം വക്രീകരണ നിരക്ക് | Output voltage waveform distortion ≤1% |
| ഇൻപുട്ട് പവർ സപ്ലൈ | Single-phase 220 or three-phase 380V voltage, frequency 50Hz |
| Working hours | Allow continuous 60min under rated load; Overpressure 1.1 times 1 minute |
| താപനില വർദ്ധനവ് | Temperature rise ≤65K after continuous operation under rated load for 60 minutes |
| Protection function | Overvoltage, overcurrent, zero start, system mismatch (flashover) and other protection functions |
| ആംബിയന്റ് താപനില | -20℃-55℃ |
| ആപേക്ഷിക ആർദ്രത | ≤90%RH |
| ഉയരം | ≤3000m |
Highlight technological advantages
Compared to traditional power frequency withstand voltage testing equipment, series resonant devices have significant performance advantages:
Small size and light weight: By utilizing resonant boosting, the power supply capacity is only 1/Q of the capacity of traditional power frequency test transformers, significantly reducing the overall size of the equipment and greatly reducing the burden of on-site handling and high-altitude operations.
Pure and stable waveform: The resonant circuit has a strong filtering and suppression effect on high-frequency harmonics, and the output waveform is close to a perfect sine wave, effectively avoiding hidden damage to the insulation of the test sample caused by harmonic peaks.
Overvoltage protection mechanism: When the test sample experiences breakdown or flashover, the resonance condition is immediately destroyed, and the high-voltage output automatically drops instantly without overvoltage oscillation. This "automatic arc extinguishing" feature can protect the test sample from extensive damage and ensure the safety of on-site operators.
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Typical application scenarios
This device is widely used in industries such as power, metallurgy, petroleum, chemical, and railway, and is suitable for the following main scenarios:
High voltage power cables: on-site assessment of AC withstand voltage and insulation status.
GIS/GIL switchgear: voltage withstand test and aging test.
Large generator/motor: stator winding to ground AC withstand voltage.
Power Transformer: External voltage withstand test (using compensating capacitors or special wiring methods).
Frequently asked questions
Q: If the resonance point cannot be found during the experiment, how should it be handled?
Answer: First, check if the wiring is correct and confirm the matching relationship between the reactor and the test sample. If the parameters of the reactor do not match the capacitance of the test sample, replace it with a reactor with appropriate parameters; Next, check if there are serious insulation defects in the test sample that cause abnormal capacitance, and first investigate the fault of the test sample; At the same time, check whether the power frequency is stable to avoid power fluctuations affecting the search for resonance points.
Q: How to solve the resonance point drift that occurs during the experiment?
Answer: Resonance point drift is often caused by changes in the temperature of the test sample, heating of the reactor, or unstable power frequency. By controlling the duration of the test, equipment overheating can be avoided; Ensure stable temperature in the testing environment and reduce the impact of environmental factors; Choose a high stability variable frequency power supply to avoid power frequency fluctuations, and enable the device to automatically track the resonance point function, adjust the frequency in real time, and ensure stable testing.
Q: Can I modify the reactor of the resonant device by myself to increase the output voltage?
Answer: Absolutely prohibited! Unauthorized modification of reactors can damage the insulation coordination design of the equipment, leading to the failure of overvoltage protection, which may cause serious accidents such as equipment damage and electric shock to personnel. If it is necessary to increase the output voltage, it is necessary to choose a suitable model of equipment or contact the manufacturer for professional upgrading.
Q: What should be noted when using resonance devices in cold environments?
Answer: For environments below -10 ℃, the control box needs to be preheated for 30 minutes in advance to ensure the normal operation of the frequency conversion circuit; Select insulation materials with good low-temperature characteristics to avoid insulation performance degradation of reactors and capacitive dividers due to low temperatures; Clean the surface condensation of the equipment in a timely manner after the experiment to prevent insulation from getting damp.
