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Энергетические кабели - Испытания и диагностика Испытание напряжением СНЧ (VLF) VLF (СНЧ) 28
VLF (СНЧ) 28
Серия: SebaKMT
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In accordance with most regulations, cables and joints must be tested after installation or repair. For this test the breakdown strength of the cable is tested.
The portable VLF Test System CR 28 kV of Seba KMT can be used to test the cables in conjunction with the according local regulations for operating voltage levels up to 15 kV for new cables and 22 kV for aged cables at 4,6 ?F cable capacity.
By using the patented Seba KMT 0.1 Hz Cosine Square Wave Voltage, weak and for further operation critical spots in PE, XLPE but also in paper cables are brought to a controlled breakdown very fast without causing additional damage or ageing to the cable insulation.
The VLF Test System CR 28 kV consists of a DC source, which charges the test object up to the required test voltage level and the commutator unit (switched rectifier) which performs the regular 5 second interval polarity change.
The change over from one polarity to the reverse one is performed wit the support of the switched rectifier, an inductivity (choke) and a capacitor, which is build of the internal 0.3 ?F and the cable capacity itself. The L / C resonance circuit produces a cosine shaped voltage with slopes identical to a 50 Hz sine wave.
Technical Features
- The VLF Test System CR 28 kV in two parts is a very powerful, universal and at the same time portable unit.
- Control and power module with approx. 25 kg individual weight.
- Standard breakdown recognition and shut-down.
- VLF / DC leakage current measurement.
- The patented change over principle in combination with the recycling of energy stored in the cable capacity results, in comparison to other methods, in a lower weight, less energy consumption and much higher test capacity.
- The high test capacity of 4,6 ?F permits the simultaneous testing of all three phases.
- The mode "Sheath Fault Location" (SFL mode) allows pinpointing of sheath faults. This mode requires a ground fault locater.
- The method is officially recommended by the two VDE Standards 0276-620 and 0276-621.
- The advantages of the VLF method with 0.1 Hz Cosine Wave Voltage are proved by extensive scientific research results, as well as in practical field experiences.
- VLF is the most efficient method to test PE and XLPE cables.
- Touch proof connectors in combination with integrated discharge facilities provide highest safety standard.
Optional equipment
- Detection of breakdown
- Leakage current measurement
- Logging
- Printout (Protocol printing)
Технические характеристики:
| Output voltage source | 12 mA |
| Display range leakage current measurement | 0 … 12 mA |
| Display resolution | 10 ?A |
| Output voltage VLF | 0 - 28 kVeff |
| Voltage shape | Cosine Square Wave |
| Change over slope | approx. 5 ms analogue to 50 Hz mains |
| Frequency | 0.1 Hz |
| Output voltage DC | 0 ... 28 kV |
| Testable cable capacity | max. 4,6 ?F |
| Sheath fault location voltage | 0 – 10 kV |
| Pulse rate for sheath fault location | 4s 1:3 4s 1:5 6s 1:5 6s 1:9 |
| Discharge unit | integrated, 4,6 ?F in 5 s |
| Power supply | 230 V, 50 Hz, approx. 2.5 A 120 V, 60 Hz, approx. 5 A |
| Operating temperature | -20°C ... 50°C |
| Weight | approx. 25 kg control module approx. 25 kg power module |
| Dimensions (W x H x D) | 550 x 700 x 420 mm |
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