SWGB-20-7 surge wave generator with testing and burning

SWGB-20-7 Surge Wave Generator 

Surge Wave Generators with testing and burning SWGB-series are intended for: 

- Testing insulation of cables and other devices and appliances by DC voltage 20 kV;

- Conditioning faults by burning faulty insulation of cables with its subsequent afterburning;

- Prelocation of cable fault with time domain reflectometer SPARK-4 based on the pulse reflection method (TDR), voltage wave oscillation method (DECAY), impulse current envelope (ICE) method and arc reflection method (ARC);

- Pinpointing of cable faults with acoustic method using geophone (POISK-2016 or P-806)

According to statistics, the most common faults in the three-phase underground power cable occur such as "single-phase breakdown" (breakdown of one of the cores to the cable sheath). Breakdown of this type can be "creeping" (intermittent) (ie recovering insulation up to a certain voltage, which is lower than the operating voltage of the cable), and with the "insulation leakage" (insulation resistance decreases up to tens kilohms - hundreds ohms).

Quite frequent cases of breakdown of the two cores one to another and to cable sheath (line-to-line short circuit).

For single-phase breakdowns developers recommend the acoustic method of finding and identifying the fault location.

For the line-to-line short circuit it can be recommended induction method using GZCH-2500 with receiver P-806 or POISK-2016 fault location for "loop" with preliminary insulation burning.

Note that in some cases you can use the receiver P-806 or POISK-2016 to determine the cable route using a burning signal.

SWGB-20-7 parameters

Testing kV DC                                                             1-20

Surge at 20 kV, Joules                                                1400

Surge capacity, µF                                                       7 

Number of stages                                                        5 (1-5-10-15-20 kV)

Operating modes:

- manual                                                                        single pulse

- automatic                                                                    surge rate 0,4 Hz

Burning, max                                                                 20 kV, 9A

Afterburning (conditioning faults), max                         500V, 19A    

Sheath fault locating, max                                            20kV, 1400J              

Mains supply,                                                                220 ± 10%, 50/60 Hz                        

Dimensions, mm                                                           1150x630x1065

Weight, kg                                                                     190

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