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HF-CH-202 OWTS Oscillating Wave Test System for 35kV MV Cables
This integrated OWTS oscillating wave test system combines AC series resonance withstand voltage and partial discharge detection. Compliant with IEC 60270, it accurately locates insulation defects for 35kV cables and supports both handover and preventive maintenance tests efficiently.
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Electrical power cables undergo regular insulation performance tests under power-off conditions, in accordance with the items and test cycles specified in the Test Procedures for Handover & Preventive Tests of Electrical Equipment. Among all test methods, the frequency-tuned series resonance withstand voltage test is most widely adopted domestically, as its test conditions closely simulate the actual operating state of cables.
Nevertheless, abundant test data and practical experience prove that the series resonance withstand voltage test cannot quantitatively evaluate the overall health status of cables. High-voltage cables that have passed this test may still suffer dielectric breakdown within a short period. Long-term research and experiments on high-voltage cables have verified that partial discharge is the precursor to cable insulation faults; effective partial discharge detection is therefore a vital approach to elevate cable condition-based maintenance standards.
The Oscillating Wave Test System (OWTS) represents an innovative technique for cable condition maintenance. Traditional OWTS applies DC voltage to XLPE cables to diagnose and locate partial discharge under damped oscillating wave conditions. However, DC withstand voltage tests on XLPE cables tend to accumulate space charge, which causes latent damage to cable insulation and easily triggers false partial discharge signals, leaving room for further optimization.
To solve these drawbacks, we developed an AC Damped Oscillating Wave Partial Discharge Test Device. Equipped with an AC high voltage source, it is built upon the AC series resonance boost platform. A peak synchronous signal cuts off power output at the resonance peak while closing the high-voltage electronic switch simultaneously, generating damped oscillation to carry out partial discharge tests on power cables.
It reliably detects tiny insulation defects on cables and cable joints with precise positioning capability.
This all-in-one unit supports both partial discharge measurement under oscillating wave conditions on site, and standard frequency-tuned series resonance AC withstand voltage tests for cable handover & preventive maintenance. Dual functions greatly improve equipment utilization efficiency.
Features & Main Functions
- Integrates AC series resonance boosting and oscillating wave partial discharge testing into one single device; completes both partial discharge inspection and AC withstand voltage tests to comply with current industry specifications.
- Applicable to handover tests for newly installed cables before commissioning, as well as preventive maintenance tests for aged out-of-service cables.
- Complies with IEC 60270 standard for cable partial discharge measurement.
- Performs distance measurement for cable partial discharge defect points.
- Measures positions of cable joints and full cable length.
- The variable-frequency host automatically boosts voltage according to grid parameters; the notebook system collects test data automatically for easy operation.
- Adopts combined hardware & software anti-interference technology to effectively eliminate external electromagnetic disturbances.
- Built-in expert software system: displays partial discharge waveforms, discharge volume, test voltage and other parameters in real time; supports real-time data storage, test report generation and printing.
Technical Specifications
| Item | Specification |
|---|---|
| Test Object Capacitance | ≤ 0.6 μF |
| Maximum Test Voltage | AC 55 kV |
| Damped Oscillating Wave Frequency Range | 30 ~ 300 Hz |
| Frequency Range of Variable Frequency Series Resonance Withstand Voltage Test | 30 ~ 300 Hz |
| Partial Discharge Measuring Range | 10pC ~ 20nC |
| Partial Discharge Positioning Accuracy | 1% |
| Applicable Cables | Rated voltage ≤ 35kV, cross-sectional area: 400mm², maximum cable length: 3km |
Packing List: OWTS Oscillating Wave Test System
| No. | Item Description | Qty | Unit | Remarks |
|---|---|---|---|---|
| 1 | Main Variable Frequency Series Resonance Host | 1 | Set | Core control unit |
| 2 | High Voltage Reactor | 1 | Set | For AC withstand voltage test |
| 3 | Damped Oscillating Wave Partial Discharge Detection Module | 1 | Set | PD testing & positioning component |
| 4 | High Voltage Capacitor Divider | 1 | Pc | Voltage sampling & measurement |
| 5 | Partial Discharge Sensor & Signal Acquisition Clamp | 1 | Set | Collect cable discharge signals |
| 6 | High Voltage Connecting Cables & Grounding Wires | 1 | Set | Connection accessories |
| 7 | Industrial Notebook with Test Analysis Software | 1 | Pc | Built-in operating system & report generation program |
| 8 | Power Input Cable | 1 | Pc | Mains power supply line |
| 9 | User Manual (English Version) | 1 | Copy | Complete operation guidance |
| 10 | Factory Calibration Certificate | 1 | Copy | For overseas project acceptance |
| 11 | Product Qualification Certificate | 1 | Copy | |
| 12 | Warranty Card | 1 | Copy | |
| 13 | Heavy-duty Shockproof Aluminum Transport Case | 2 | Pcs | Protect all instruments during sea & land transportation |
FAQ | OWTS Oscillating Wave Test System
Q1: What is an OWTS Oscillating Wave Test System?
A: It is a dual-purpose integrated device, designed for 35kV medium voltage cables. It can conduct AC series resonance withstand voltage test and damped oscillating wave partial discharge detection simultaneously to diagnose cable insulation faults.
Q2: What is the core working principle of this OWTS device?
A: Based on AC series resonance boosting, the system generates damped oscillating waves to stimulate partial discharge inside cables. It captures discharge signals to locate tiny insulation defects and cable joint damage accurately.
Q3: Which cables is this OWTS system applicable to?
A: It fits power cables with rated voltage ≤35kV, cross-section up to 400mm², and maximum testing length of 3km, widely used for XLPE medium voltage power cables.
Q4: Does the equipment comply with international industry standards?
A: Yes, its partial discharge measurement fully conforms to the IEC 60270 international standard, meeting global power engineering acceptance requirements.
Q5: What testing scenarios can this machine handle?
A: It supports handover acceptance tests for newly laid cables before operation, as well as regular preventive insulation tests for aging in-service cables.
Q6: What is the maximum output test voltage of the system?
A: The maximum AC test voltage reaches 55kV, which fully covers the testing demands of all 35kV medium voltage power cables.
Q7: How accurate is the partial discharge positioning?
A: The partial discharge positioning accuracy is 1% of the total cable length, which can pinpoint the exact position of insulation defects and faulty cable joints.
Q8: What is the measurable partial discharge range?
A: The partial discharge testing range is from 10pC to 20nC, capable of capturing faint early discharge signals inside cable insulation.
Q9: Why is dual-function design (AC withstand voltage + PD test) beneficial?
A: One machine realizes two complete cable tests. It avoids purchasing two separate devices, greatly cuts procurement costs and improves field testing efficiency.
Q10: Is the system resistant to on-site electromagnetic interference?
A: It adopts combined hardware and software anti-interference technology, which effectively eliminates external field interference and ensures stable test data at complex substations.
Q11: Can the system automatically save test data and generate reports?
A: Equipped with an expert software system, it records waveforms, discharge volume and voltage data in real time. It supports automatic storage, report generation and printing.
Q12: What accessories are included in the standard complete set?
A: The package contains resonance main unit, high voltage reactor, PD detection module, voltage divider, signal sensors, connecting wires, industrial laptop, operation manuals, calibration certificate and shockproof transport cases.
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