Megger Seba VLF CR-60 for cable VLF, DC and sheath fault testing
Portable VLF test systems for testing medium voltage cables according to IEC 60502-2 and IEEE 400.2.
Megger VLF CR-60 Key Features:
- VLF, DC and sheath fault testing in one device
- Portable thanks to two-part construction
- High test capacitance
- Integrated discharge system
The portable, high-performance and energy-efficient VLF test systems are used for testing cables with 0.1 Hz cosine-rectangular voltage according to IEC/IEEE/CENELEC standards. In accordance with guidelines, the dielectric strength of cables and joints must be checked after installation or repair.
The VLF test systems from SebaKMT have high test-capacities and are still compact, because of the patented voltage wave-shape and the power-recycling during polarity reversal. Aside from cable and sheath testing, the test systems can also be used for the precise pinpointing of sheath faults (in combination with a step-voltage probe).
High test capacity - The systems consist of a control unit and an HV unit. Because of their two-part construction, the systems are easy to transport. One of the advantages of the cosine-rectangular test method is the high test capacitance of up to 5 μF at 0.1 Hz. This test capacitance allows all three phases to be tested simultaneously with the standardised test frequency of 0.1 Hz.
Proven procedure Using - 0.1 Hz cosine-rectangular voltage, weak points in the cable can be safely broken down. The benefits of the VLF method using 0.1 Hz cosine-rectangular voltage have been confirmed by numerous scientific examinations and practical field trials. Since the patent was granted in 1987, more than 2,500 systems have been sold worldwide. This proven volt-age shape is recommended by the CENELEC HD 620 and HD 621 harmonisation documents, the IEC 60502-2 standard and the IEEE 400.2 standard.
DC testing, sheath fault testing and pinpointing - By switching to DC testing, the cables and connected sub-stations can be tested with negative and positive DC volt-age. Aside from cable and sheath testing, the test systems can also be used to precisely pinpoint sheath faults (in com-bination with a step-voltage probe e.g. the ESG NT).
The various models of the VLF CR 60 kV:
- (899007187-S) VLF CR 60 kV Waveform Test System - Plus (Basic equipment, cable set HV/LV, accessory bag)
- (108300017) VLF CR 60 kV Waveform Test System - Basic Offshore
- (108300018) VLF CR 60 kV Waveform Test System - Plus Offshore (Basic equipment, cable set HV/LV, accessory bag)
In total three portable systems are available, each with different voltage levels (28, 40 and 60 kVrms):
- VLF CR-28 up to cable series 15 kV
- VLF CR-40 up to cable series 23 kV
- VLF CR-60 up to cable series 35 kV