ISSN 10683712, Russian Electrical Engineering, 2013, Vol. 84, No. 10, pp. 586–590. © Allerton Press, Inc., 2013.
Original Russian Text © A.V. Korzhov, A.A. Kozin, 2013, published in Elektrotekhnika, 2013, No. 10, pp. 55–59.
Currently, techniques and tools for the evaluation
of partialdischarge (PD) parameters are used in
urban distribution networks for diagnosing the insula
tion of 6(10)kV powercable lines (CLs), especially
with the new crosslinked polyethylene insulation.
However, the theory of PD development and growth of
dendrites in insulation has not been fully developed,
because it contains an array of physical and chemical
problems [1–6] and the growth of dendrites is charac
terized by a complex stochastic nature. There is a cur
rent trend worldwide toward diagnostics based on
characteristics of partial discharges. Thus, one of the
important tasks is to study the dependences of PD
characteristics on various operational factors taking
into account the specificity of the aging cable network
in terms of diagnosing cableoperating regimes.
In order to solve this problem, from 2009 to 2013,
PD parameters were regularly evaluated on nine active
and seven 6(10)kV test cable lines of the interregional
powergrid facility of the city of Neftekamsk (AnBn,
ASB, and AAShv CL types) selected as research
objects. The objectives of these studies were as follows.
(1) To evaluate the effectiveness of the existing
diagnostic technique described in electricalinstalla
tion regulations, i.e., rectified overvoltage tests, and to
establish the experimental dependences of changes of
the PD intensity on the number of tests and the level of
the applied voltage.
(2) To evaluate the impact of operating conditions
on the insulation and aging of cables specifically with
reference to their use in the urban powerdistribution
(3) To investigate the regime of a singlephase fault
in a 6(10)kV cable network and the possibility of diag
Processes in the insulation were evaluated with
respect to the characteristics and the intensity of par
tial discharges (amplitude (Q02), mV; intensity (PDI),
mW; and number of pulses) using an R400 diagnos
tics device (VibroTsentr, Perm). The PD was sampled
on the grounding conductor of sheaths of a CL with an
RFCT5 highfrequency sensor . The insulation
resistance and leakage current were sampled with the
AIP70 highvoltage test laboratory and F 410221 M
The Effect of the Operating Regime of 6(10)kV Power Cables
on Parameters of Partial Discharges in Insulation
A. V. Korzhov
and A. A. Kozin
South Ural State University, Chelyabinsk, 454080 Russia
Received September 16, 2013
—The effect of the operating regime of 6(10)kV power cables of urban powerdistribution networks
on the parameters of partial discharges in insulation is investigated. Operating regimes of the cable, regimes after
highvoltage testing and short circuits, and the ability to diagnose a singlephase fault in an urban 6(10)kV
powerdistribution network are analyzed. Dependences of changes in partial discharge intensity in these
regimes are defined.
: 6(10)kV power cable, operating regime, insulation, partial discharges
3 5 7 9 11 13 15 17 19 21
PD intensity (PDI), mW
The change of PD parameters in insulation depend
ing on the applied voltage and the number of tests: (
) 24, and (
) 15 kV.
The original version of this article was revised: A previously
missing affiliation was added.