Hoja Coordinacion Aislamiento
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24.019.6
Urp(p-e) en KV = 19.40Urp(p-p) en KV = 33.60
19.40 Kv 33.60 Kv
Ue2 en p.u = 2.9 Ue2 en p.u = 2.5 2.6Up2 en p.u = 4.35 Up2 en p.u = 3.75 4.34Uet en p.u = 3.38 Uet en p.u = 2.88 3.00Upt en p.u = 5.008 Upt en p.u = 4.258 4.995Uet en Kv = 66.136 Uet en Kv = 56.338 58.788U K 98 12 U K 83 43 9 88
Overvolteges originating from station 1
Energization and re-energization
Ue2 en p.u =Up2 en p.u =Uet en p.u =Upt en p.u =Uet en Kv =U K
STEP 1: Determination of the representative overvoltages (Urp)
Kv phase-to-phase
Phase-to-phase : Urp(p-p) =
Us =Power-frecuency Voltage
Temporary overvoltages
Earth faults
Load rejection 1.4
Kv (crest)
Urp(p-e) en KV = 19.40Earth-fault factor: k = 1.4
Max. Overvoltage en p.u =
1.0 p.u =
Resulting representative overvoltegesPhase-to-earth : Urp(p-e) =
Slow-front overvoltages
Overvolteges originating from station 2
Re-energization Capacitorswitching
Upt en Kv = 98.127 Upt en Kv = 83.43 97.88
No YesPhase-to-earth : Urp = Ups = 45 Kv Urp(p-e) = 45 Kv Urp(p-e) = 45 KvPhase-to-phase : Urp = 2Ups = 90 Kv Urp(p-p) = 97.88 Kv Urp(p-p) = 90 Kv
5445 Upl en Kv =
For other equipment
With or without capacitor switching Capacitor switching at station 2Uet > Ups Upt > 2 Ups
For Line entrance equipment
Arresters at line entrance and near transformers : Ups en Kv =
Upt en Kv =
Fast-front overvoltages Evaluated in step 2
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a) Ups/Ue2 = 0.79 a) 2Ups/Up2 = 1.06 1) Ups/Ue2 = 0.92 1) 2Ups/Up2 = 1.225b) Ups/Ue2 = 0.92 b) 2Ups/Up2 = 1.22 2) Ups/Ue2 = 0.88 2) 2Ups/Up2 = 1.06
a) Kd = 1.08 a) Kd = 1.00 0 1) Kcd = 0.00b) Kd = 0.00 b) Kd = 0.00 1.06 2) Kcd = 1.00
Kcd = 1.08 1.080.00
Ucw = Kcd x Urp Ucw = Kcd x Urp 48.38 1) Ucw = 0.00Ucw (KV)= 48.38 Ucw (KV)= 90 0.00 2) Ucw = 97.88
a) From reenergization at station 2 1) With capacitor switching at station 2b) From capacitor swithing at station 2 2) Without capacitor switching at station 2
1) kcd =2) kcd =
1) Kcd =2) Kcd =
2) Ucw =
Retained value :
1) Ucw =
Retained value :
Phase to phase
1Temporary overvoltage
Phase to earth en Kv : Ucw = Kc x Urp =Phase to phase en Kv: Ucw = Kc x Urp =
Kc Factor =
Phase to phase Phase to earthPhase to earth
19.4033.6
STEP 2: Determination of the coordination withstand voltages (Ucw)
Slow-front overvoltage Deterministic metod used = Kcd factor
Line entrance equipement (external insulation only) Other equipment
Parameter A = 900Span length Lsp = 100 mOutage rate Rkm = 0.03 Km/yearAcceptable failure rate Ra = 0.0067 Years
Arrester Lightning protection level : Upl = 54 KvMax. Separation from internal insulation: L = 8 m La = 223.33 mMax. Separation from external insulation: L = 15 m
Internal insulation : Ucw 76.27 KvExternal Insulation : Ucw 95.75 Kv
n = 1n = Numero de lineas conectadas a la Subestacion
performance requiredData from experience
Fast-front overvoltages Simplified statical method used
aspplcw LL
LnAUU *
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Internal insulation : Ks =External insulation : Ks =
Internal insulation : Urw = Ucw x KsExternal insulation : Urw = Ucw x Ks x Ka
Kv Kv Kv Kv
K KI l i
Internal Insulation
ExternalI l i
22.31Internal
Insulation38.64
External
Insulation
Phase to earth Phase to phase Phase to earth Phase to phase
Line entrance
I l i
87.71External Insulation
External Insulation
87.71
Temporary overvoltage withstand Switching impulse withstand Lighting impulse withstand
ExternalI l i
Internal Insulation
External
equipment
Phase to earth Phase to phase
Line entranceequipment
Internal
Atmospheric correction factor Altitude H = 3570 m
Step 3 : Determination of the required withstand voltages (Urw)
Safety factor 1.151.05
Power - frequency withstand Switching impulse withstand Lighting impulse withstand
Phase to earth Phase to phase Phase to earth Phase to phase Phase to earth Phase to phase
m = 1
Ka = 1.5497
m = 0.5
Ka = 1.2449
8 1 146 44
m = 1
Ka = 1.550
m = 1
Ka = 1.5497
Required withstand voltages
Kv Kvkv kv kv kv
1) kv 1) kv2) kv 2) kv
1) With capacitor switching at station 21) kv 1) kv 2) Without capacitor switching at station 22) kv 2) kv
m =H =Ka =
3570
25.36 43.92
InternalInsulation
ExternalInsulation
55.630.00
Otherequipment
78.710.00
Insulation Insulation Insulation
Insulation
Otherequipment
Internal
155.80
0.00112.56External
155.80Insulation
1.4197
78.71 146.44
0.8
Insulation0.00
159.27
8150.
Hm
a eK
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External insulation : External insulation :- phase to earth 0.6 + Urw/8500 - phase to earth 1.3- phase to phase 0.6 + Urw/12700 - phase to phase 1.05 + Urw/9000
Internal insulation : Internal insulation :- phase to earth 0.5 - phase to earth 1.1- phase to phase 0.5 - phase to phase 1.1
- phase to earth - phase to earth - phase to earth - phase to earthKv 1) Kv Kv 1) Kv
2) Kv 2) Kv- phase to phase - phase to phase
Kv - phase to phase Kv - phase to phase1) Kv 1) Kv2) Kv 2) Kv
- phase to earth - phase to earth1) Kv 1) Kv
Step 4 : Conversion to withstand voltages normalized for range I
Conversion of switching impulse withstandVoltages to lightning impulse
withstand voltagesConversion of switching impulse withstandVoltages to short-duration power.frequency
withstand voltagesConversion factorsConversion factors
Line entranceequipment
Internal Insulation
otherequipment
External insulation External Insulation
61.19
otherequipment
0.0097.56
External Insulation47.96 102.33 102.33
Internal Insulation27.82
0.00 0.00156.15
0.00170.05
Line entranceequipment
47.96
89.55
External insulation
1) Kv 1) Kv2) Kv 2) Kv- phase to phase - phase to phase1) Kv 1) Kv2) Kv 2) Kv
0.00
0.0056.28 123.82
0.00
0.00
61.1927.82
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Frecuencia Fase - TierraIndustrial Fase - Fase
Impulso de Fase - TierraManiobra Fase - FaseImpulso Fase - Tierra
Atmosferico Fase - Fase
* 70 kV Para tensiones de soportabilidad de corta duracion a frecuencia industrial * 170 kV Para tensiones de soportabilidad al impulso atmosferico
Para el aislamiento de equipos en S.U. 22.9 kV se selecciona las siguientes tensiones de soportabilidad
RESUMEN DE LAS TENSIONES DE SOPORTABILIDAD REQUERIDAS
Urw(s) Urw22.31 0.00
de maniobra y rayo Urw(s)25.36
Urw Urw(s)
155.80156.15155.80
KV r.m.s paraFrecuencia industrial
Kv Pico para impulsosAislamiento externo
Equipos entradade linea Otros equipos
78.71146.4443.92
47.9689.55
102.33
56.2897.560.00
87.71 0.00112.5638.64
155.80
43.92159.27
Aislamiento interno
(1) (1) (1)0.00
Urw25.36 0.00
87.71 123.82 De acuerdo a la tabla 2 de la Norma IEC 60071-1 se selecciona valores normalizados de aislamiento
que cubriran cualquier aislamiento externo e interno fase-fase y fase-tierra.
155.80
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