Article Type: Research Article Article Citation: Neetu Baghelkar, and Prof. Abhishek Dubey. (2020). STUDY AND
PERFORMANCE OF PARTIAL DISCHARGE OF MODEL FOR DIFFERENT TYPE INSULATION
MATERIALS WITH CAPACITANCE VALUE. International Journal of Research
-GRANTHAALAYAH, 8(12), 323-327. https://doi.org/10.29121/granthaalayah.v8.i12.2020.2975 Received Date: 01 December 2020
Accepted Date: 31 December 2020
Keywords: Partial Discharge Insulation
Materials Capacitance Value Simulation The properties of the insulating material must be the best to avoid failure of electrical equipment. Partial discharges act as electrical sparks that occur within insulation and the high-voltage electrical system. The different types of voltage and current pulses are produced, which last for a very short time. Partial discharge is taking place in high voltage power equipment such as cables, transmission lines and transformers, etc.
1. INTRODUCTIONThe first concept to review is the characteristic feature that partial discharges occur only during the first and third trimesters of each cycle. This is the initial rising positive signal and the initial rising negative signal. Indeed, during the initial upward positive signal, all capacitive components are charging until the initial partial discharge voltage is reached at each specific vacuum and partial discharges begin. When the positive wave cycle begins to decrease, the positive voltage at each vacuum decreases, as some capacitive charge remains. There must be some level of charge since the voltage across a capacitor cannot be changed instantly. The design of the insulation must meet
vital requirements such as the evaluation of the electrical stresses that the
insulation can withstand, and also the behavior of
said insulating medium when subjected to applied electrical stresses. The
coordination of the insulation reveals the close concordance between the
electrical stresses developed on the insulation and the dielectric strength of
the insulating medium. Solid insulation with imperfections or voids that lead
to PD can be represented by an equivalent circuit as shown in Fig. In the
equivalent circuit, Cc corresponds to the capacitance of the vacuum;
Cb is the capacitance of the insulation in
series with Cc and Ca is the capacitance of the void-free
sound part of the insulation parallel to the vacuum. When the applied voltage
is increased, a critical value is reached across Cc and a discharge
occurs across it. Because the gaps are filled with gas whose resistance to
rupture is less than solid insulation. The condition for the capacitance model
shown in Fig. Should be Cc << Cb
<< Ca. 2. RESULTS AND DISCUSSIONThe capacitance value for epoxy resin (ɛr = 3.4) as Ca = 5.34 × 10-12 F, Cb = 4.23 × 10-13 F and Cc = 2.88 × 10-14F is used for simulation in MATLAB. We use the parameter used in the Simulink model after we are discovering the partial discharge value as 6 X 10-4 amplitude PD (V) shown in Figure 2, when applied the AC voltage source as 220 X103 (V) using the value of capacitance as 0.33 X10-6 F. After that, it is observing the partial discharge value as 1.5 X 10-3 amplitude PD (V) shown in Figure 3, when applied the AC voltage source as 220 X103 (V ) using the capacitance value as 0.47 X10-6 F. The capacitance value for vulcanized fibers (ɛr = 2.5) as Ca = 5.13 × 10-12 F, Cb = 4.26 × 10-13 F and Cc = 2.78 × 10-14F is used for simulation in MATLAB. We use the parameter used in the Simulink model after we are discovering the value of the partial discharge as 1.0 X 10-3 amplitude PD (V) shown in Figure 4, when applied the AC voltage source as 220 X103 (V) using the capacitance value as 0.33 X10-6 F. After that, it is observing the partial discharge value as 1.5 X 10-3 amplitude PD (V) shown in Figure.5, when applied to AC voltage source like 220 X103 (V) using the capacitance value as 0.47 X10-6 F. The capacitance value for polyethylene (ɛr = 2.2) as Ca = 4.88 × 10-12 F, Cb = 3.87 × 10-13 F and Cc = 2.81 × 10-14F is used for simulation in the MATLAB. We use the parameter used in the Simulink model after we are discovering the partial discharge value as 3.0 X 10-3 amplitude PD (V) shown in Figure 6, when applied the AC voltage source as 220 X103 (V) using the capacitance value as 0.33 X10-6 F. After that, it is observing the partial discharge value as 3.0 X 10-3 amplitude PD (V) shown in Figure 7, when applying the AC voltage source as 220 X103 (V) using the capacitance value as 0.47 X10-6 F.
Figure 1: MATLAB Simulink model
Figure 2: Value of partial discharge
Figure 3: Value of partial discharge
Figure 4: Value of partial discharge
Figure 5: Value of partial discharge
Figure 6: Value of partial discharge
Figure 7: Value of partial discharge 3. CONCLUSIONIn this work, three insulating materials are considered, such as epoxy resin (ɛr = 3.4), vulcanized fibers (ɛr = 2.5) and polyethylene (ɛr = 2.2), which have different relative permittivity (ɛr). The different types of capacitors are also used, the capacitance value values are 0.33 X10-6 F, 0.47 X10-6 F in the Simulink model, after that it is observing the different partial discharge values. The capacitance value for polyethylene (ɛr = 2.2) as Ca = 4.88 × 10-12 F, Cb = 3.87 × 10-13 F and Cc = 2.81 × 10-14F is used for simulation in the MATLAB. We use the parameter used in the Simulink model after we are discovering the partial discharge value as 3.0 X 10-3 amplitude PD (V) shown in Figure 6, when applied the AC voltage source as 220 X103 (V) using the capacitance value as 0.33 X10-6 F. After that, it is observing the partial discharge value as 3.0 X 10-3 amplitude PD (V) shown in Figure 7, when applying the AC voltage source as 220 X103 (V) using the capacitance value as 0.47 X10-6 F. Thus, the partial discharge value is stable as 3.0 X 10-3 amplitude PD (V) using polyethylene (ɛr = 2.2). SOURCES OF FUNDINGThis research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors. CONFLICT OF INTERESTThe author have declared that no competing interests exist. ACKNOWLEDGMENTNone. REFERENCES [1] K. S., Srinivasa, D. M.: 'Analysis
study on partial discharge magnitudes to the parallel and perpendicular axis of
a cylindrical cavity', International Journal of Engineering Trends and
Technology, 2017, 45, (7), pp. 334-337. [2] W. S., Kuffel,
J.: 'High voltage engineering: fundamentals' (Eleslever,
2005). [3] Boggs, S. A.: 'Partial discharge.
iii. cavity-induced PD in solid dielectrics', IEEE Electrical Insulation
Magazine, 1990, 6, (6), pp. 11-16. [4] Ab Halim Abu Bakar, “Partial
Discharge Patterns in High Voltage Insulation” IEEE International Conference on
Power and Energy (PECon), Kota Kinabalu Sabah, Malaysi, 2-5 December 2012. [5] I.W. McAllister,” Partial
Discharges in Spheroidal Voids Void Orientation”, IEEE Transactions on
Dielectrics and Electrical Insulation bl. 4 No. 4, August 1997.
This work is licensed under a: Creative Commons Attribution 4.0 International License © Granthaalayah 2014-2020. All Rights Reserved. |