Al Dahiya - Insulation - Coordination - 080307 [PDF]

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Insulation Coordination Study for 380 & 115 kV System

DATE

A

NO.

REVISIONS DRAWN BY:- T.B. DATE:- 05-03-2007

CHECKED BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY DATE:-

ENG'G. DEPT. BY:DATE:-

CERTIFIED. BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

1 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

AL DHAHIYAH 380 / 115 KV BSP

05-03-07

BY

T.B.

ISSUED FOR BASE DESIGN SUBMITTAL

DESCRIPTION

CHK'D

APPR'D

Eastern Region Branch

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Saudi Electricity Company

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Purpose

2.0

Reference Standards / Documents

3.0

Insulation coordination for 380 kV System

3.1

Insulation Levels

3.2

Coordination of Insulation Levels with the Surge Arrestor Ratings

3.3

Selection of other ratings of surge arrestor

4.0

Insulation Coordination for 115 kV System

4.1

Insulation Level

4.2

Coordination of Insulation Levels with the Surge Arrestor Ratings

05-03-07

BY DATE

A

NO.

REVISIONS

4.3

Selection of other ratings of surge arrestor

DRAWN BY:- T.B.

5.0

Summary

DATE:- 05-03-2007

CHECKED BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY DATE:-

ENG'G. DEPT. BY:DATE:-

CERTIFIED. BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

2 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

1.0

T.B.

ISSUED FOR BASE DESIGN SUBMITTAL

DESCRIPTION

Table of Contents

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Saudi Electricity Company

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Purpose of Insulation Co-ordination study is selection of the insulation levels of 380 kV and 115 kV substation equipment and coordination of the Surge Arrestor rating with the insulation levels for proper protection of the Substation equipment from possible overvoltages. Also , the other relevant ratings required to specify the protective Surge Arrestors have been calculated for the purpose of selection of Surge Arrestor

BY

T.B. 05-03-07

A

NO.

DATE

ISSUED FOR BASE DESIGN SUBMITTAL

DESCRIPTION

2.0 Reference Standards / Documents

REVISIONS DRAWN BY:- T.B. DATE:- 05-03-2007

-

SEC Standard SES- P – 119.02 SEC Standard SES- P – 119.05 SEC Standard SES- P – 119.06 SEC Standard 35 SMSS-3 IEC-71-1 IEC-71-2 AREVA Data Sheet for 380 kV SF6 GIS Hyundai Data Sheet for 115 kV SF6 GIS Hyundai Data Sheet for 380 /115 kV Power Transformer

3.0 Insulation Coordination for 380 kV System 3.1 Insulation Level The possible overvoltages in the system may be classified as follows : a) Temporary Power Frequency Overvoltages. These may occur due to the voltage rise in unfaulted phases during Sngle Line to Ground fault, Sudden Load Rejection or due to Ferroresonence effects. b) Switching Overvoltages. These may occur during normal line switching, high speed auto reclosing, out of phase switching of cable circuits, capacitor banks, reactors, circuit breaker restriking, current chopping etc. These over voltages are predominant in long transmission lines of 230 kV and 380 kV.

CHECKED BY:- T.B.

c) Lightning Overvoltage. These occurs due to direct lightning strokes on the phase conductors.

DATE:- 05-03-2007

OPRG. DEPT BY

As per Table -05-2 of SES- P – 119.05, the expected overvoltage profile for the above 3 cases for 380 kV system of SECO-East is as follows :

DATE:-

ENG'G. DEPT. BY:DATE:-

Power Frequency Overvoltage : 530 kV rms Switching Surge Overvoltage : 1020 kV peak Lightning Impulse Overvoltage : 1200 kV peak

CERTIFIED. BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

3 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

1.0 Purpose

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Saudi Electricity Company

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Power Frequency Overvoltage : 570 kV rms Basic Switching Impulse Level ( BSL) :1300 kV peak Basic Lightning Impulse Level ( BIL) :1050 kV peak Insulation Level offered by Manufacturers

BY

T.B. 05-03-07

A

NO.

DATE

ISSUED FOR BASE DESIGN SUBMITTAL

DESCRIPTION

A. 380 kV GIS Rated Operating Voltage : 380 kV 30 Min Emergency Operating Voltage : 420 kV BIL : : 1425 kV BSL : : 1050 kV

REVISIONS DRAWN

B. 380 / 115 kV Power Transformer HV Winding Rated Operating Voltage : 380 kV 30 Min Emergency Operating Voltage : BIL : : 1300 kV BSL : : 1050 kV Since the Insulation Levels offered for 380 k V GIS and Power Transformer is in line with the recommendation of SES-P-119-02, these are in order. 3.2 Coordination of Insulation Levels with the Surge Arrestor Ratings Maximum protection levels for the Protective Devices (Surge Arrestors) have been recommended in Table 05-3 of SES-P-119.05. For 380 kV System, the following Protection Levels have been recommended: Maximum Switching Impulse Protection Level: 874 kVpeak Maximum Lightning Impulse Protection Level: 1064 kVpeak The Protection Levels offered by the manufacturer for 380 kV Gas Insulated Surge Arrestor are as follows (From item 4.18 of Data Schedule for 380 kV SF6 Gas Insulated Switchgear) :

BY:- T.B. DATE:- 05-03-2007

a) Maxm. Lightning Impulse Residual Voltage at various discharge current:

CHECKED BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY DATE:-

- 5 kA - 10 kA - 20 kA - 40 kA

: 786 kV : 836 kV : 903 kV : 994 kV

< 1064 kV

b) Maxm. Switching Surge Residual Voltage at various discharge current:

ENG'G. DEPT. BY:DATE:-

CERTIFIED. BY:-

- 0.5 kA - 1 kA - 2 kA - 3 kA

: 686 kV : 702 kV : 727 kV : 753kV

< 874 kV

DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

4 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

CHK'D

Accordingly, the Insulation Levels recommended in SES-P-119-02 for 380 kV System (internal insulation) is as follows :

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Saudi Electricity Company

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Protective Ratio is defined as the ratio of the Insulation Level of the protected equipment to the Protection Level of the Surge Arrestor. Thus , Protective Ratio for lightning surge withstand level is

DATE

05-03-07

NO.

A

BY

T.B.

ISSUED FOR BASE DESIGN SUBMITTAL

DESCRIPTION

=

REVISIONS

BIL --------------------------------------------------------------------lightning impulse protection level of protective device 1425 ------------------------------------------------------ = 1.43 994

=

Minimum value recommended in SES-P-119.05 for 380 kV System is 1.2. Since Protective Ratio for lightning surge withstand level is higher than this value, Surge Arrestor selected is o.k. Similarly, Protective Ratio for Switching Surge withstand level is =

BSL --------------------------------------------------------------------switching impulse protection level of protective device

=

DRAWN BY:- T.B.

1050 ------------------------------------------------------ = 1.39 753

Minimum value recommended in SES-P-119.05 for 380 kV System is 1.15

DATE:- 05-03-2007

CHECKED BY:- T.B.

Since Protective Ratio for switching surge withstand level is higher than this value, Surge Arrestor selected is o.k.

DATE:- 05-03-2007

OPRG. DEPT BY

3.3 Selection of other ratings of surge arrestor a) Typical Arrestor Rating

DATE:-

ENG'G. DEPT. BY:-

As per recommendation of Table 06-1 of SES-P-119.06, Typical Arrestor Rating for 380 kV System is 360 kV.

DATE:-

CERTIFIED. BY:-

As per item no. 4.18 of Data Schedule for SF6 Gas Insulated Switchgear, Rated Voltage of Surge Arrestor, considered by manufacturer, is 360 kV – which is in order

DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

5 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

Hence, the Protection Levels considered for the Surge Arrestors are o.k.

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b) Maximum Continuous Operating Voltage ( MCOV) As per guideline of item 4.1 of SES-P-119.06, the MCOV is selected as 80% of Arrestor Voltage Rating, i.e., i.e., MCOV = 360 x 0.8 = 288 kV

DESCRIPTION

As per item no. 4.18 of Data Schedule for SF6 Gas Insulated Switchgear, MCOV of Surge Arrestor, considered by manufacturer, is 288 kV.

As per recommendation of SES-P-119.06, Nominal Discharge Current for Surge Arrestors shall be 10 kA or 20 kA. Accordingly, from item no. 4.18 of Data Schedule for SF6 Gas Insulated Switchgear, Nominal Discharge Current with 8/20 µs Lightning Impulse for Surge Arrestor is 20 kA – which is in order. d) Energy absorption capability

T.B.

As per item no. 4.18 of Data Schedule for SF6 Gas Insulated Switchgear, Line Discharge Class considered by the manufacturer is 5 – i.e., the highest class.

05-03-07

The energy likely to be discharged during a surge can be estimated using the following formula: J = ½ CE2

A

NO.

BY

Arrestors are further classified from class – 1 to 5 with ascending number indicating higher energy absorption capability.

DATE

ISSUED FOR BASE DESIGN SUBMITTAL

c) Nominal Discharge Current Rating

REVISIONS DRAWN

Where,

J = Total energy available in Joules C = Capacitance in µF of the line E = Crest Value of surge voltage in kV (L-G)

BY:- T.B. DATE:- 05-03-2007

CHECKED

Value of Capacitive Succeptance B for 4 Nos. 547 mm2 conductor used for 380 kV line is

BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY DATE:-

B = Mho / km / ph. As per information received, the maximum length of the 380 kV Ghunan feeder is 35 kM. Hence B = 2.76 x 10 -6 x 35 = 96.6 x 10 -6 Mho.

ENG'G. DEPT.

Hence C = B / (2π.60) = 96.6 x 10 -6 / (2 x 3.1416 x 60) = 0.256 µF

BY:DATE:-

CERTIFIED.

As per Table 05-2 , expected maximum lightning surge for 380 kV System is 1200 kVpeak

BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

6 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

CHK'D

APPR'D

Eastern Region Branch

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Saudi Electricity Company

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Eastern Region Branch

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Hence J = ½ x 0.256 x 12002 = 184320 Joules = 184.32 kJ Assuming the maximum no. of possible disharge without cooling is 3, the total energy to b dissipated in the arrestor in service is 184.32 x 3 = 552.96 kJ ⇒ The specific energy required to be dissipated by 360 kV arrestor in 380 kV system is

DESCRIPTION

= 552.96 / 360 = 1.53 kJ / kV of Arrestor rating, or = 552.96 / 288 = 1.92 kJ/kV of MCOV rating.

-

13 kJ / kV of Arrestor Rating 16.2 kJ/kV of MCOV

The recommended Minimum Energy Absorption Capability of 360 kV Surge Arrestor, as per recommendation of Table – II of 35-SMSS-3 is 7.2 kJ/kV of Arrestor Rating. Since offered Energy Absorption Capability rating is more than both the calculated rating as well as SEC recommended rating, hence this is in order. 4.0 Insulation Coordination for 115 kV System 4.1 Insulation Level As per Table -05-2 of SES- P – 119.05, the expected overvoltage profile for 115kV system of SECO-East is as follows :

A

NO.

DATE

05-03-07

BY

T.B.

ISSUED FOR BASE DESIGN SUBMITTAL

As per item no. 4.18 of Data Schedule for SF6 Gas Insulated Switchgear, Maximum Energy Absorption Capability considered by the manufacturer is :

REVISIONS DRAWN

Power Frequency Overvoltage : 218 kV rms Switching Surge Overvoltage : Not Predominant Lightning Impulse Overvoltage : 400 kV peak

BY:- T.B. DATE:- 05-03-2007

CHECKED

Accordingly, the Insulation Levels recommended in SES-P-119-02 for 115 kV System (internal insulation) is as follows :

BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY DATE:-

Power Frequency Overvoltage : 230 kV rms Basic Switching Impulse Level ( BSL) :Not recommended Basic Lightning Impulse Level ( BIL) :550 kV peak Insulation Level offered by Manufacturers

ENG'G. DEPT. BY:DATE:-

CERTIFIED. BY:-

A. 115 kV GIS Rated Operating Voltage : 115 kV 30 Min Emergency Operating Voltage : 127 kV BIL : : 550 kV

DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

7 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

CHK'D

Hence E = 1200

APPR'D

Eastern Region Branch

CHK'D

-

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BSL :

: Not Specified

B. 380 / 115 kV Power Transformer LV Winding Rated Operating Voltage : 115 kV 30 Min Emergency Operating Voltage : BIL : : 550 kV BSL : : Not Specified

DESCRIPTION

Since the Insulation Levels offered for 115 k V GIS and Power Transformer is in line with the recommendation of SES-P-119-02, these are in order.

Maximum protection levels for the Protective Devices (Surge Arrestors) have been recommended in Table 05-3 of SES-P-119.05. For 380 kV System, the following Protection Levels have been recommended: Maximum Switching Impulse Protection Level: 280 kVpeak Maximum Lightning Impulse Protection Level: 355 kVpeak The Protection Levels offered by the manufacturer for 115 kV Gas Insulated Surge Arrestor are as follows (From item 4.18 of Data Schedule for 115 kV SF6 Gas Insulated Switchgear) : c) Maxm. Lightning Impulse Residual Voltage at various discharge current: - 5 kA - 10 kA - 20 kA - 40 kA

: 244 kV : 261 kV : 286 kV :-

< 355 kV

A

NO.

DATE

05-03-07

BY

T.B.

ISSUED FOR BASE DESIGN SUBMITTAL

4.2 Coordination of Insulation Levels with the Surge Arrestor Ratings

REVISIONS DRAWN BY:- T.B. DATE:- 05-03-2007

CHECKED

d) Maxm. Switching Surge Residual Voltage at various discharge current: - 0.5 kA - 1 kA - 2 kA - 3 kA

:: 217 kV ::-

< 280 kV

BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY

Hence, the Protection Levels considered for the Surge Arrestors are o.k. Protective Ratio is defined as the ratio of the Insulation Level of the protected equipment to the Protection Level of the Surge Arrestor. Thus ,

DATE:-

ENG'G. DEPT.

Protective Ratio for lightning surge withstand level is

BY:DATE:-

CERTIFIED.

BIL

BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

8 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

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Saudi Electricity Company

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Eastern Region Branch

CHK'D

=

‫ع ا  ا ـ‬

--------------------------------------------------------------------lightning impulse protection level of protective device

550 ------------------------------------------------------ = 1.55 355

=

Minimum value recommended in SES-P-119.05 for 115kV System is 1.4

A

NO.

DATE

05-03-07

BY

T.B.

ISSUED FOR BASE DESIGN SUBMITTAL

DESCRIPTION

Since Protective Ratio for lightning surge withstand level is higher than this value, Surge Arrestor selected is o.k.

REVISIONS DRAWN

4.3 Selection of other ratings of surge arrestor a)

Typical Arrestor Rating

As per recommendation of Table 06-1 of SES-P-119.06, Typical Arrestor Rating for 115 kV System is 108 kV. As per item no. 4.18 of Data Schedule for 115 kV SF6 Gas Insulated Switchgear, Rated Voltage of Surge Arrestor, considered by manufacturer, is 108 kV – which is in order b)

Maximum Continuous Operating Voltage ( MCOV)

As per guideline of item 4.1 of SES-P-119.06, the MCOV is selected as 80% of Arrestor Voltage Rating, i.e., i.e., MCOV = 108 x 0.8 = 86.4 kV As per item no. 4.18 of Data Schedule from M/s Hyundai for 115 kV SF6 Gas Insulated Switchgear, MCOV of Surge Arrestor, considered by manufacturer, is 87kV – which is in order.

BY:- T.B. DATE:- 05-03-2007

c)

Nominal Discharge Current Rating and Arrestor Class

CHECKED BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY DATE:-

As per recommendation of SES-P-119.06, Nominal Discharge Current for Surge Arrestors shall be 10 kA or 20 kA. Accordingly, from item no. 4.18 of Data Schedule from M/s Hyundai for 115 kV SF6 Gas Insulated Switchgear, Nominal Discharge Current with 8/20 µs Lightning Impulse for Surge Arrestor is 10 kA – which is in order.

ENG'G. DEPT. BY:DATE:-

CERTIFIED. BY:-

e) Energy absorption capability

DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

9 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

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Saudi Electricity Company

CHK'D

APPR'D

Eastern Region Branch

‫ع ا  ا ـ‬

Arrestors are further classified from class – 1 to 5 with ascending number indication higher energy absorption capability. As per item no. 4.18 of Data Schedule for 115 kV SF6 Gas Insulated Switchgear, Line Discharge Class considered by the manufacturer is 3 - with Maximum Energy Absorption Capability of 7.2 kJ / kV of Arrestor Rating and 8.9 kJ / kV of MCOV . The recommended Minimum Energy Absorption Capability of 108 kV Surge Arrestor, as per recommendation of Table – II of 35-SMSS-3 is 7.2 kJ/kV of Arrestor Rating.

DESCRIPTION

Since the offered figure is in line with the recommendation of SEC, hence this is in order.

The above study shows that the insulation levels selected for 380 kV and 115 kV GIS equipment and 380/115 kV Power Transformer are in order. Protection Level offered fofor the surge arrestors were reviewed and protection ratios were calculated for Lightning Impulse and Switching Impulse Surges. It shows that sufficient protection margin exists between protection levels of the Surge Arrestors and Insulation Levels of the equipment, thereby implying that the GIS equipments are well protected.

A

NO.

DATE

05-03-07

BY

T.B.

ISSUED FOR BASE DESIGN SUBMITTAL

5.0 Summary

REVISIONS DRAWN BY:- T.B. DATE:- 05-03-2007

CHECKED BY:- T.B. DATE:- 05-03-2007

OPRG. DEPT BY DATE:-

ENG'G. DEPT. BY:DATE:-

CERTIFIED. BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED

DRAWING TITLE

INDEX

INSULATION COORDINATION FOR 380 & 115 KV SYSTEM AL DHAHIYAH 380/115kV BSP AL DHAHIYAH

A

PLANT

DRAWING NO.

SHEET NO.

REV NO.

DA409

EE-026319

10 of 10

A

SAUDI ARABIA JOB ORDER NO. – 33-060102001

DWG. CONT. SHT. EE -023065

SEC-ERB CAD-E (2002/03) WORD

THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.

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Saudi Electricity Company