power system studies - koncar-institut.hr · » grounding system analysis » cable sizing » motor...
TRANSCRIPT
| KONČAR Power System Studies
Specific areas that we cover with our experts are:
Power system studies:
KONČAR – Electrical Engineering Institute, Inc. and its partner Institutions offer studies related to power systems and transformers. They include feasibility studies, engineering analysis, verification of the existing studies, consulting, fault analysis, etc.Extensive experience of the KONČAR – Electrical Engineering Institute, Inc. and its partners in power en-gineering meets all the requirements of the nowadays state of the art power system studies. Offered areas cover all stationary and transient studies related to power systems. Numerous references of our expert engineers are available upon your request.
Overview
Areas of expertise
Types of expert studies
» Transformers » Phase shifters » Static var compensators » Variable shunt reactors » HVDC technologies » Gas insulated substations » Air insulated substations » Overhead lines
» Cables » Thermal power plants » Hydro power plants » Wind and solar power plants » Electric railways » Arc-furnaces » Emitted electromagnetic field levels
» Load flow » Short circuit » Switching transients » Lightning transients » Grounding system analysis » Cable sizing » Motor starting » Fault analysis » 3D FEM analysis » Overvoltages and insulation coordination » Power quality (unbalance, flicker and harmonic analysis) » Calculation of electric and magnetic fields around power system objects (substations, transmission lines, cables, power plants, etc.)
» Analysis of electromagnetic interference caused by a HV transmission network on buried pipelines & communication cables
» Dimensioning of compensators (SVC), network frequency response and dimensioning of harmonic filters
» Reactive power compensation in transmission networks
tradition. knowledge. responsibility.
To conduct studies, we are using the following software in collaboration with our partner Institutions:
» EMTP-RV » EMTP-ATP » NEPLAN » ETAP » PSS/E » DIgSILENT » Simulink » Infolytica Suite (MagNet, ElecNet, ThermNet) » Ansys EM suite (Maxwell, HFSS) » EFC-400
Transients recorded by monitoring system in case of a lightning strike to the 220 kV overhead line. The recorded signal is taken from the Končar’s transformer monitoring system TMS+ and it shows how the overvoltage is transmitted through an au-totransformer.
Available software
Transient studiesMeasured frequency dependent admittance matrix of a power transformer. It is used to create a black box transformer model in EMTP-RV. This model can be used for switching and lightning studies, to calculate the voltages transmitted through a trans-former.
Lightning strike to the overhead line simulated in EMTP-RV with detailed transformer model. The model is used to calculate the amplitude of the transmitted overvoltages through a power transformer.
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28-250
-200
-150
-100
-50
0
50
100
150
200
t (ms)
U (k
V)
A (HV) B (HV) C (HV) A (LV) B (LV) C (LV)
Span
Transformer
Cable network
Lighting strike
Power network
Tower grounding resistance
Tower model
| KONČAR Power System Studies
Shunt reactorSF6 circuit breaker
Transmission network
Surge arrester
Busbar
+1uH
+0.5
+1uH
+0.5
+0.5nF
+
C230.05nF
+0.5nF
+1uH
+0.5
+1uH
+0.5
+0.5nF
+
C260.05nF
+0.5nF
+1uH
+0.5
+1uH
+0.5
+0.5nF
+
C290.05nF
+0.5nF
Arc model based on Schwarz/Avdonin equation
DEV13
Arc model based on Schwarz/Avdonin equation
DEV14
Arc model based on Schwarz/Avdonin equation
DEV15
Arc model based on Schwarz/Avdonin equation
DEV16
Arc model based on Schwarz/Avdonin equation
DEV17
Arc model based on Schwarz/Avdonin equation
DEV18
ZnO
+
660000 ?vi
ZnO1
+
+ RL5
+
1uF C34
+
AC5?v
+
Data functionL nonlinear
+R
37?i
+R
38?i
+Lnonl13?if
+L2
4?i
+1 2
Tr0_9
1
+1 2
Tr0_10
1
+A
m17?i
VM+?v
m18
VM+?v
m19
VM+?v
m20
+
Lnonl14?if
+
Lnonl15?if
+R
39?i
+R
40?i
+R
41?i
+R
42?i
+
3.8nF C31
+
0.1nF C32
+
0.1nF C33
+L2
5
7.19
+L2
6
7.19
+L2
7
7.19
Data functionZnO
a
b
c
BUS9
c
a
b
BUS10
a
c
b
BUS8
Network model for simulating switching transients of a shunt reactor. Switching of a shunt reactor may cause severe transients such as high inrush currents or overvoltages.
Switching of small inductive currents in the case of de-energization of a shunt reactor leads to switching overvoltages.
Inrush current in the case of energization of a shunt reactor.
Harmonics and short circuit analysisEquivalent scheme of a system for analyzing SVC and filters interaction with the network. The model is used in an iterative procedure to determine the technical characteristic of the filter and to calculate har-monic distortions generated by the SVC operations.
Network
Transformer
Filter 2Filter 1SVC
Frequency (Hz)
Impe
danc
e (o
hm)
0 50
10
20
30
40
50
100 150 200 250 300 350 400
tradition. knowledge. responsibility.
0 kV19.7 kA
0 kV16.3 kA
0 kV25.6 kA0 kV
35.6 kA0 kV
33.2 kA
0 kV31.8 kA
0 kV40.6 kA
Network 1
Network 2
Generator 1 Generator 2
Generator 3
Motor 1
Motor 2
3D FEM analysis
Model for calculation of short circuit currents in the case of a three-phase fault.
3D FEM core type power transformer model. The model is used to evaluate the stray losses in the transformer’s structural elements and to determine the value of the short circuit impedance of the trans-former.
Magnetic induction calculation for the power transformer model.
Temperature calculation for a power trans-former. The results are used to check the hot spots in a clamping system and to dimension the transformer according to the calculated temperature values.
tradition. knowledge. responsibility.
KONČAR-Institute-Power System Studies-10-1902
Contact us for more information!www.koncar-institut.com [email protected]
Fallerovo šetalište 22Zagreb 10000, Croatia
KONČAR Electrical Engineering Institute, Inc.