HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES
In this article, the main parameters for monitoring the insulation state of the windings of electrical machines are analyzed, the input resistances of the windings are studied as generalized parameters, and the calculation of high-frequency processes in the winding using circuit substitution schemes...
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| Дата: | 2022 |
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| Автори: | , , , , |
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| Мова: | Українська |
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Institute of Renewable Energy National Academy of Sciences of Ukraine
2022
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Репозитарії
Vidnovluvana energetika| _version_ | 1871103588071112704 |
|---|---|
| author | Chumak, V. V. Kovalenko, М. А. Trotsenko, Y. O. Stulishenko, A. S. Tymoshchuk, O. L. |
| author_facet | Chumak, V. V. Kovalenko, М. А. Trotsenko, Y. O. Stulishenko, A. S. Tymoshchuk, O. L. |
| author_institution_txt_mv | [
{
"author": "V. V. Chumak",
"institution": "National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv "
},
{
"author": "М. А. Kovalenko",
"institution": "National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv "
},
{
"author": "Y. O. Trotsenko",
"institution": "National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv "
},
{
"author": "A. S. Stulishenko",
"institution": "National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv "
},
{
"author": "O. L. Tymoshchuk",
"institution": "National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv "
}
] |
| author_sort | Chumak, V. V. |
| baseUrl_str | https://ve.org.ua/index.php/journal/oai |
| collection | OJS |
| datestamp_date | 2026-07-18T06:32:17Z |
| description | In this article, the main parameters for monitoring the insulation state of the windings of electrical machines are analyzed, the input resistances of the windings are studied as generalized parameters, and the calculation of high-frequency processes in the winding using circuit substitution schemes is carried out. A method for detecting defects in housing insulation is proposed, as well as a method for detecting short-circuited turns in multi-turn general-purpose asynchronous generator. It is shown that resonance phenomena in the absence and presence of a defect in the form of a short-circuited turn of one of the three phases of the winding of an electric machine are of a different nature when artificial resonances are created in the winding at lower or higher frequencies compared to common resonance. |
| doi_str_mv | 10.36296/1819-8058.2022.4(71).56-63 |
| first_indexed | 2025-07-17T11:38:53Z |
| format | Article |
| fulltext |
56
Відновлювана енергетика. №4/2022 | Вітроенергетика
UDC 621.313 https://doi.org/10.36296/1819-8058.2022.4(71)56-63
HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-
TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES
Received 03 Oct. 2022; accepted 27 Dec. 2022.
Available online 30 Dec. 2022
V. V. Chumak1, М. А. Kovalenko2, Y. O. Trotsenko3, A.
S. Stulishenko4, O. L. Tymoshchuk5
Author for correspondence: Vadym Chumack
e-mail: chumack_kpi@ukr.net
In this article, the main parameters for monitoring the insula-
tion state of the windings of electrical machines are analyzed,
the input resistances of the windings are studied as general-
ized parameters, and the calculation of high-frequency pro-
cesses in the winding using circuit substitution schemes is car-
ried out. A method for detecting defects in housing insulation
is proposed, as well as a method for detecting short-circuited
turns in multi-turn general-purpose asynchronous generator.
It is shown that resonance phenomena in the absence and
presence of a defect in the form of a short-circuited turn of
one of the three phases of the winding of an electric machine
are of a different nature when artificial resonances are cre-
ated in the winding at lower or higher frequencies compared
to common resonance.
Keywords: frequency characteristics, inter-turn insulation,
multi-turn coils, eddy currents.
ВИСОКОЧАСТОТНІ МЕТОДИ ВИЯВЛЕННЯ ДЕФЕКТІВ ІЗОЛЯЦІЇ ВСИПНИХ ОБМОТОК
ГЕНЕРАТОРІВ ЕНЕРГОУСТАНОВОК НА ОСНОВІ ВІДНОВЛЮВАЛЬНИХ ДЖЕРЕЛ ЕНЕРГІЇ
Отримано 03 жовт. 2022; рекомендовано до публікації 27 груд. 2022
Доступно онлайн 30 груд. 2022
В. В. Чумак1, М. А. Коваленко2, Є. О. Троценко3, А.
С. Стулішенко4, О. Л. Тимощук
Автор для кореспонденції: Вадим Чумак
e-mail: chumack_kpi@ukr.net
У цій статті проаналізовано основні параметри для
контролю стану ізоляції обмоток електричних машин,
досліджено вхідні опори обмоток як узагальнені пара-
метри, проведено розрахунок високочастотних про-
цесів в обмотці за допомогою ланцюгових схем
заміщення. Запропоновано спосіб виявлення дефектів
корпусної ізоляції, а також метод виявлення короткоза-
мкнених витків в багатовиткових асинхронних двигунах
1 Cand. Sc, Assoc. Prof. of Department of Electro-
mechanics.
https://orcid.org/0000-0001-8401-7931
2 Cand. Sc, Assoc. Prof. of Department of Electro-
mechanics.
https://orcid.org/0000-0002-5602-2001
3 Cand. Sc, Assoc. Prof. of Department of Theo-
retical Electrical Engineering.
https://orcid.org/0000-0001-9379-0061
4 PhD student of Department of Electromechanics.
https://orcid.org/0000-0001-9982-9246
5 Cand. Sc, Assoc. Prof. of Department of Mathe-
matical Methods of System Analysis of the Edu-
cational and Scientific Institute of Applied Sys-
tem Analysis.
https://orcid.org/0000-0003-1863-3095
1,2,3,4,5 National Technical University of Ukraine
“Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv
1 канд. тех. наук, доц. каф. електромеханіки.
https://orcid.org/0000-0001-8401-7931
2 канд. тех. наук, доц. каф. електромеханіки.
https://orcid.org/0000-0002-5602-2001
3 канд. тех. наук, доц. каф. теоретичної елек-
тротехніки.
https://orcid.org/0000-0001-9379-0061
4 аспірант каф. електромеханіки.
https://orcid.org/0000-0001-9982-9246
5 канд. тех. наук, доц. каф. математичних ме-
тодів системного аналізу навчально-науко-
вого Інст. прикладного системного аналізу.
https://orcid.org/0000-0003-1863-3095
1,2,3,4,5 Національний технічний університет Ук-
раїни «Київський політехнічний інститут імені
Ігоря Сікорського», м. Київ
57
Відновлювана енергетика. №4/2022 | Вітроенергетика
загального призначення. Показано, що резонансні явища при відсутності та наявності дефекту у ви-
гляді короткозамкненого витка однієї з трьох фаз обмотки електричної машини мають різний ха-
рактер при створенні в обмотці штучних резонансів на нижчих або вищих частотах порівняно з при-
родним резонансом.
Ключові слова: частотні характеристики, міжвиткова ізоляція, багатовиткові котушки, вихрові
струми.
Introduction. Pulse width modulated electric drives, static
power converters and asynchronous generators are widely
used in various industries due to their suitable characteris-
tics and application flexibility [1, 2]. The effects of high-fre-
quency voltage components introduced by the pulse-width
modulation method are usually not taken into account
when analyzing the electromechanical characteristics of a
generator. On the contrary, a high dV/dt applied to the gen-
erator introduces a small amount of high-frequency leak-
age currents through the dissipated distributed capaci-
tance between the stator winding and the generator hous-
ing. Since the generator housing is usually connected to
earth using a grounding circuit, high frequency leakage cur-
rents present in the electrical network can cause electro-
magnetic interference [3].
The high-frequency model proposed in this paper is based
on lumped parameters and is related to the classical model
of quantitative generator data; it is accurate in the fre-
quency range from several hertz to several megahertz. This
type of model avoids the use of distributed parameters and
is therefore suitable for circuit simulation. High-frequency
phenomena include two main capacitive effects associated
with: capacitance between the winding and ground; inter-
turn capacitance of the winding. In this work, by means of
circuit simulation in specialized software [4], acceptable re-
sults were obtained.
Object of research
The object of the study is an autonomous gasoline generator
with a capacity of 3.8 kV∙A. Structurally, the power electrical
installation is a synchronous clear-pole generator with elec-
tromagnetic excitation. The parameters of the studied gen-
erator and its winding data are given in the Table. 1.
Table 1. Parameters of studied synchronous generator
Table 1. Parameters of studied synchronous generator
№ Parameter Value
1 Full rated power, kV∙A 3.8
2 Nominal line voltage, V 380.0
3 Nominal phase current, A 5.75
4 Number of phases, connection diagram 3/Y
5 The number of turns in the coil 17
6 Diameter of the winding wire, mm 1.0∙3
7 Number of parallel branches 1
8 Step of winding along the grooves 17; 15; 13
9 Outer diameter of stator boring, mm 225.0
10 The inner diameter of the stator bore, mm 145.0
11 Active length of the stator magnetic core, mm 80.0
12 The number of stator slots 36
13 Stator winding insulation class F
14 The size of the air gap, mm 0.5
15 Stator winding weight, kg 4.1
Methods of research
It is obvious that both of the above capacitances are in fact
distributed, but as mentioned earlier, the proposed ap-
proach is based on lumped parameters [5]. Fig. 1 shows a
phase high frequency substitution scheme.
Fig. 1. – Equivalent circuit with lumped parameters
On Fig. 1: Rec – resistance of eddy currents; R – phase re-
sistance of the stator and rotor; L – inductance; K is the lon-
gitudinal capacitance representing the inter-turn distrib-
uted capacitance; C is the transverse capacitance, which
represents the distributed capacitive pairs between the
winding and the ground; G is the conductivity, which repre-
sents the eddy currents inside the magnetic circuit and the
housing.
The parallel connection of the equivalent circuit elements L
and K, as well as C and G, are generally accepted and do not
need additional explanations. Parallel rather than series
connection of elements L i r follows from simple physical
considerations. The eddy currents induced in the steel
sheets of the stator and rotor are, as it were, the secondary
currents of the transformer. As is known, it is convenient to
represent the equivalent circuit of a transformer as a paral-
lel connection of the reactance corresponding to the pri-
mary winding and the loading resistance representing the
secondary winding [6].
It is important to emphasize that the quantities must be
considered as values relating to the star connected phase.
The winding up to the distributed capacitance was repre-
sented by two combined capacitances of the same value,
the first of which was connected between the phase termi-
nal and ground, and the second between the generator
neutral and ground. A star connection of the generator is
58
Відновлювана енергетика. №4/2022 | Вітроенергетика
envisaged, but the delta connection of the generator does
not invalidate the model justification.
Phase resistance R and phase inductance L at 50/60 Hz ob-
tained from closed-loop tests. As the results of the experi-
ment showed, the generator response quickly fades over
time. The typical resistance values R are too low to explain
the observed damping [7].
An analysis of the physical phenomenon leads to the as-
sumption that the damping factor is associated with the fact
of energy dissipation at high-frequency eddy currents. As a
consequence, the resistance R, which represents eddy cur-
rents, must be connected in parallel with the leakage induct-
ance. To characterize the generator in the high frequency
range, it is possible to assess the frequency response of the
two impedances given in Fig. 2, a and Fig. 2, b.
Fig. 2 – Connections for measuring impedance: a) Zwg; b) Zwn
The impedance Zwn is the result of a measurement between
three phases connected together with the generator neu-
tral, with a floating earth (Fig. 2, a). The impedance Zwg is
the result of the measurement between the generator
three phases connected together and the earth terminal,
with the generator floating neutral (Fig. 2, b).
In the considered frequency range, the phase resistance R
is much less than the inductance L [8]. In the following rea-
soning, the stator resistance can be neglected. Circuit
impedances in Fig. 2, a and Fig. 2, b can be easily evaluated
by simulation in various circuit simulation applications [4].
Below are the simulation diagrams (refer to Fig. 3).
The evaluation of the parameters used in the substitution
scheme was calculated from the frequency characteristics
taken on the generator.
Fig. 3 – Electrical circuits for simulation: a) impedance Zwg;
b) impedance Zwn
Fig. 4 – Experimental results for the frequency response of the impedance Zwg.
0
2000
4000
6000
8000
10000
12000
1000 10000 100000 1000000
Im
pe
da
nc
e
Z
Frequency f
Z(f)
59
Відновлювана енергетика. №4/2022 | Вітроенергетика
A comparison between experimental and simulation re-
sults is shown below. Fig. 4 and Fig. 5 show the experimen-
tally measured frequency responses. Fig. 6 and Fig. 7 show
the frequency response simulation results.
Defect detection
The reliability problem of inter-turn insulation of electrical
machine windings is relevant and demands the creation of
tools and equipment for diagnosing windings, in particular,
this applies to windings of electrical machines with a large
number of turns, in which the detection of one or more
short-circuited turns is a difficult task and requires the cre-
ation and use of sensitive equipment [2].
An analysis of the sensitivity to turn-to-turn short circuits
and the reliability of the control of inter-turn insulation of
various connection schemes for the asynchronous genera-
tor windings and known from the literature and developed
devices for monitoring the inter-turn insulation of the
windings of electrical machines shows that the most
effective methods and devices which are based on the com-
parison of the input active-inductive parameters of the
windings. The most sensitive to inter-turn short circuits are
bridge circuits for connecting windings to a test voltage
source with subsequent processing of the received diag-
nostic signal.
Based on the analysis of the effect of a short-circuited turn
on the active-inductive parameters of the phases of the
asynchronous generator windings, it was proposed that
short-circuited turns should be detected by changing the
quality factors of the phases
L
R
L
L
RC
L
R
Q ω=
ω
== 21
11
,
since LC1=ω due to a short-circuited coil at the op-
timal frequency fopt, corresponding to the greatest impact
Fig. 6 – Simulation results for frequency response of the
impedance Zwg.
Fig. 7 – Simulation results for frequency response of the
impedance Zwn.
Fig. 5 – Experimental results for the frequency response of the impedance Zwn.
0
20000
40000
60000
80000
100000
120000
140000
160000
180000
200000
1000 10000 100000 1000000
Im
pe
da
nc
e
Z
Frequency f
Z(f
60
Відновлювана енергетика. №4/2022 | Вітроенергетика
of a short-circuited turn on the active resistance of this
phase. At this frequency, the quality factor of the winding
has a maximum value, and the active losses in the winding
copper are equal to the active losses in steel [9].
In order to obtain maximum sensitivity to inter-turn short
circuits, two or three phases of the winding are connected
according to the bridge scheme to the circle of the self-os-
cillator (Fig. 8) and in series with the inductance L of each
of the phases, an additional capacitance C is connected
such that a resonant mode is created at the frequency fopt:
LCff opt π== 210 .
Fig. 8 – Proposed circuit diagram of the high frequency
phase
When connecting the windings of asynchronous generators
according to the bridge scheme in Fig. 9, the unbalance
voltage of the bridge U12 is affected by the technological
asymmetry of the phase parameters, and the main reason
for the asymmetry is the capacitive asymmetry, which is ex-
pressed in the difference between the interphase capaci-
tances between nodes 1-3 and 2-3. Capacitive asymmetry
in the windings of generators reaches up to 20% and is sys-
tematic [10]. Then, if the phase-to-phase capacitances be-
tween the above nodes in Fig. 9, a differ by ∆С (parameters
Rf and Lf are determined considering phase-to-phase capac-
itances in the absence of asymmetry) by equivalent trans-
formations at a frequency f0, it is possible to go from the
scheme in Fig. 10, a, to the scheme in Fig. 10, b, where
equivalent values for R and C:
+
∆
−
∆
=
∆
2
1116
QQC
C
C
C
R
R
.
Fig. 10 – Substitution schemes for electrical machine wind-
ing: a) scheme with capacitive asymmetry; b) circuit equiv-
alent
Fig. 11 and Fig. 12 show graphs of impedance versus fre-
quency of the input voltage. Fig. 12 shows a graph of im-
pedance versus frequency when the generator is turned on
in an idle circuit, resonance is observed at a frequency of
72 kHz. In Fig. 12 the experiment was carried out with a de-
fect, one short-circuited turn, respectively, the resonance
is observed at a frequency of 78 kHz. The frequency differ-
ence between a winding without a defect and a winding
with a short-circuited turn is 6 kHz, which is a significant
value that is easy enough to fix using conventional equip-
ment. The input impedance at the resonant frequency in
the first case is 2892.71 Ohms, and in the second case
2447.67 Ohms, the relative difference between the values
is 18.2%, which is also quite easy to determine using con-
ventional devices.
The graphs depicted in Fig. 11, c and in Fig. 11, d also show
the dependence of the impedance on the frequency when
turned on at idle, but with a capacitance of 4700 μF con-
nected to the housing in order to shift the resonant fre-
quency to lower frequency domain. In this case, the reso-
nant frequencies are 38 kHz for an experiment without a
defect (Fig. 11, c) and 40 kHz for an experiment with a de-
fect (Fig. 11, d) with one short-circuited turn. The frequency
difference between the winding without a defect and the
winding with a short-circuited turn is 2 kHz, which is not as
noticeable as in the above experiments. The input re-
sistance at the resonant frequency in the first case is
9358.766 Ohms, and in the second case 8838.835 Ohms
Fig. 9 – Compensation schemes for technological phase asymmetry
61
Відновлювана енергетика. №4/2022 | Вітроенергетика
and the relative difference between the values is 5.9%.
Therefore, connecting a capacitance to the housing is not
useful for detecting defects in the winding.
Subsequent experiments were carried out to connect an
additional capacitance of 4700 μF in parallel with the gen-
erator phase, which made it possible to shift the resonant
frequency to higher frequency domain. For this case, the
resonant frequency is 117 kHz for an experiment without a
defect and 120 kHz for an experiment with a short-circuited
turn, the frequency difference is also small, as in the previ-
ous experiment, only 3 kHz. The input impedance at the
resonant frequency for an experiment without a defect is
1223.839 Ohm, and for an experiment with a short-cir-
cuited turn is 1178.511 Ohm, the relative difference be-
tween the values reaches 3.8%. According to literature
sources, it was established that at the frequency corre-
sponding to the maximum quality factor, the active re-
sistance of the winding is mainly determined by active
losses in copper, and at higher frequencies – by active
losses in the steel of the magnetic circuit. Further, it was
found that during inter-turn short circuit due to the current
in the short-circuited turn, the active losses in the copper
coils sharply increase, which leads to an increase in the to-
tal losses in the copper winding.
At the same time, due to the demagnetizing effect of the cur-
rent in the short-circuited turn, the flux of mutual induction
between the turn and the coil decreases, leading to a decrease
in inductance and active losses in the steel of the magnetic
core. The conducted studies on the change in the high-fre-
quency parameters of the winding in the presence of a short-
circuited turn in the coil of the asynchronous generator
showed that a decrease in inductance by 5% and an increase
in active losses in steel by 5% correspond to the calculation of
the high-frequency process shown in Fig. 12, b, d, e.
The use of frequency characteristics to control the insula-
tion of multi-turn coils of electrical machines is possible in
the following ways:
1) Setting the resonant frequency for the three phases of
the windings and comparing them with each other.
2) Setting the value of the input resistance of each phase
and also in comparing them with each other.
Technological asymmetry caused by underwinding or phase
overwinding leads to approximately the same change in
∆R/R and ∆L/L. Therefore, by connecting additional capaci-
tances C1 and C2 and adjusting them according to the scheme
in Fig. 9, a it is possible to fully compensate the capacitive
asymmetry of the winding and only partially compensate ac-
tive-inductive asymmetry. Also, when connecting capaci-
tances according to the scheme in Fig. 9, b, the active-induc-
tive asymmetry can be compensated completely, the capac-
itive asymmetry can be partially compensated.
Based on the analysis of sensitivity to inter-turn short cir-
cuits and the reliability of control, it was found that devices
of the EL-I type are based on a comparison of two voltage
curves on the phases of the generator winding when it is
Fig. 11 – Dependence plot Z(f) for the connection scheme at idle:
a) resonance at a 72,000 Hz frequency; b) with a defect (one turn is short-circuited), resonance at a 78,000 Hz frequency;
c) with an additional connection of a 4700 μF capacitance to the housing, resonance at a 38,000 Hz frequency; d) with an
additional connection of a 4700 μF capacitance to the housing and a defect (one turn is short-circuited), resonance at a
40,000 Hz frequency; e) with an additional connection of a 4700 μF capacitance in parallel to the phase, resonance at a
117,000 Hz frequency; e) with an additional connection of a 4700 μF capacitance in parallel with the phase and a defect
(one turn is short-circuited), resonance at a 120,000 Hz frequency
62
Відновлювана енергетика. №4/2022 | Вітроенергетика
switched according to the scheme in Fig. 13, a, are little sen-
sitive both to inter-turn short circuits and to the technolog-
ical asymmetry of the winding phases.
In devices known from literature sources and based on the
bridge method for monitoring turn insulation of windings
by connecting resistors R in the bridge branch according to
Fig. 13, b and applying a pulsed voltage source, the mode
Fig. 12 – Dependence plot Z(f) simulation results for the connection scheme at idle:
a) simulation results of the resonance at a 72,000 Hz frequency; b) with a defect (one turn is short-circuited), resonance
at a 78,000 Hz frequency; c) with an additional connection of a 4700 μF capacitance to the housing, resonance at a 38,000
Hz frequency; d) with an additional connection of a 4700 μF capacitance in parallel to the phase, resonance at a 117,000
Hz frequency; e) with an additional connection of a 4700 μF capacitance to the housing and a defect (one turn is short-
circuited), resonance at a 40,000 Hz frequency; e) with an additional connection of a 4700 μF capacitance in parallel with
the phase and a defect (one turn is short-circuited), resonance at a 120,000 Hz frequency.
Fig. 13 – Schemes for detecting a short-circuited turn
63
Відновлювана енергетика. №4/2022 | Вітроенергетика
for detecting inter-turn short circuits at the optimal fre-
quency is not provided. Therefore, the sensitivity of these
devices to inter-turn short circuits is also low.
High sensitivity and reliability of turn insulation control to
the absence of metal turn-to-turn short circuits in almost
all windings of asynchronous generators are achieved in the
presented register of turn-to-turn faults RVZ-2 and in auto-
matic turn fault detection devices USKZV-5A, operating ac-
cording to the scheme in Fig. 13, c. In these installations,
operating in the self-oscillator mode, with the help of in-
ductance L and capacitance C, a resonant mode is created
at the optimal frequency fopt.
Conclusions
The article proposes a high-frequency model for an induc-
tion generator based on lumped parameters. The results of
experimental and software simulations of different type
generators are in good agreement both in frequency and in
time parameters. The proposed high frequency model can
be added to the known dynamic model. It is possible to ob-
tain a complex model that allows the analysis of high-fre-
quency and low-frequency phenomena using standard
software.
Experiments have shown that resonant phenomena in the
absence and presence of a defect in the form of a short-
circuited turn in one of the three phases of the generator
winding affect differently when the resonant frequency is
shifted to the low-frequency domain from the common res-
onant frequency and when shifted to the high-frequency
domain, respectively. The input impedances of the phases
in the domain of frequencies below the common resonance
are greater in the absence of defects, and at frequencies
above the common resonance, it is less in the absence of
defects.
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| id | veorgua-article-375 |
| institution | Vidnovluvana energetika |
| keywords_txt_mv | keywords |
| language | Ukrainian |
| last_indexed | 2026-07-19T01:10:35Z |
| publishDate | 2022 |
| publisher | Institute of Renewable Energy National Academy of Sciences of Ukraine |
| record_format | ojs |
| resource_txt_mv | veorgua/e8/13b98697513dd6399e4abb6984d761e8.pdf |
| spelling | veorgua-article-3752026-07-18T06:32:17Z HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES ВИСОКОЧАСТОТНІ МЕТОДИ ВИЯВЛЕННЯ ДЕФЕКТІВ ІЗОЛЯЦІЇ ВСИПНИХ ОБМОТОК ГЕНЕРАТОРІВ ЕНЕРГОУСТАНОВОК НА ОСНОВІ ВІДНОВЛЮВАЛЬНИХ ДЖЕРЕЛ ЕНЕРГІЇ Chumak, V. V. Kovalenko, М. А. Trotsenko, Y. O. Stulishenko, A. S. Tymoshchuk, O. L. частотні характеристики, міжвиткова ізоляція, багатовиткові котушки, вихрові струми. frequency characteristics, inter-turn insulation, multi-turn coils, eddy currents. In this article, the main parameters for monitoring the insulation state of the windings of electrical machines are analyzed, the input resistances of the windings are studied as generalized parameters, and the calculation of high-frequency processes in the winding using circuit substitution schemes is carried out. A method for detecting defects in housing insulation is proposed, as well as a method for detecting short-circuited turns in multi-turn general-purpose asynchronous generator. It is shown that resonance phenomena in the absence and presence of a defect in the form of a short-circuited turn of one of the three phases of the winding of an electric machine are of a different nature when artificial resonances are created in the winding at lower or higher frequencies compared to common resonance. У цій статті проаналізовано основні параметри для контролю стану ізоляції обмоток електричних машин, досліджено вхідні опори обмоток як узагальнені параметри, проведено розрахунок високочастотних процесів в обмотці за допомогою ланцюгових схем заміщення. Запропоновано спосіб виявлення дефектів корпусної ізоляції, а також метод виявлення короткозамкнених витків в багатовиткових асинхронних двигунах загального призначення. Показано, що резонансні явища при відсутності та наявності дефекту у вигляді короткозамкненого витка однієї з трьох фаз обмотки електричної машини мають різний характер при створенні в обмотці штучних резонансів на нижчих або вищих частотах порівняно з природним резонансом. Institute of Renewable Energy National Academy of Sciences of Ukraine 2022-12-30 Article Article application/pdf https://ve.org.ua/index.php/journal/article/view/375 10.36296/1819-8058.2022.4(71).56-63 Vidnovluvana energetika ; No. 4(71) (2022): Scientific and applied Journal renewable energy ; 56-63 Возобновляемая энергетика; ##issue.no## 4(71) (2022): Scientific and applied Journal renewable energy ; 56-63 Відновлювана енергетика; № 4(71) (2022): Науково-прикладний журнал Відновлювана енергетика; 56-63 2664-8172 1819-8058 10.36296/1819-8058.2022.4(71) uk https://ve.org.ua/index.php/journal/article/view/375/292 Copyright (c) 2022 V. V. Chumak, М. А. Kovalenko, Y. O. Trotsenko, A. S. Stulishenko, O. L. Tymoshchuk https://creativecommons.org/licenses/by-nc-nd/4.0 |
| spellingShingle | частотні характеристики міжвиткова ізоляція багатовиткові котушки вихрові струми. Chumak, V. V. Kovalenko, М. А. Trotsenko, Y. O. Stulishenko, A. S. Tymoshchuk, O. L. HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES |
| title | HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES |
| title_alt | ВИСОКОЧАСТОТНІ МЕТОДИ ВИЯВЛЕННЯ ДЕФЕКТІВ ІЗОЛЯЦІЇ ВСИПНИХ ОБМОТОК ГЕНЕРАТОРІВ ЕНЕРГОУСТАНОВОК НА ОСНОВІ ВІДНОВЛЮВАЛЬНИХ ДЖЕРЕЛ ЕНЕРГІЇ |
| title_full | HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES |
| title_fullStr | HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES |
| title_full_unstemmed | HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES |
| title_short | HIGH-FREQUENCY METHODS FOR DETECTING INSULATION DEFECTS IN MESH WINDING GENERA-TORS OF POWER PLANTS BASED ON RENEWABLE ENERGY SOURCES |
| title_sort | high-frequency methods for detecting insulation defects in mesh winding genera-tors of power plants based on renewable energy sources |
| topic | частотні характеристики міжвиткова ізоляція багатовиткові котушки вихрові струми. |
| topic_facet | частотні характеристики міжвиткова ізоляція багатовиткові котушки вихрові струми. frequency characteristics inter-turn insulation multi-turn coils eddy currents. |
| url | https://ve.org.ua/index.php/journal/article/view/375 |
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