IS 14902-1: Performance of High-Voltage D.C. (HVDC) Systems, Part 1: Steady State Conditions

80 Pages·2001·4.4 MB·English

by  Bureau of Indian Standards

इंटरनेट मानक
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru
“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 14902-1 (2001): Performance of High-Voltage D.C. (HVDC)
Systems, Part 1: Steady State Conditions [ETD 40: HVDC
Power Systems]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”

IS 14902( Part 1 ) : 2001
IEC 60919-1 ( 1988 )
W’?mm

a.#r.
G=fdrR!m (q=Ldr.a.#L)wll-ar&l
c n
lLIC#IIIYCIT
*m”
‘JTFr13mR’mf131mQn
Indian Standard
PERFORMANCE OF HIGH-VOLTAGE HVDC )
d.C. (
SYSTEMS
PART 1 STEADY STATE CONDITIONS
ICS 29.200:29.240.99

0 BIS 2001
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

January 2001 Price Group 15
IS 14902( Part 1) :2001
IEC 60919-1( 1988)
High VoltageDirect Current Power Systems Sectional Committee, ET 40
NATIONALFOREWORD
This standard (Part 1)which isidentical with IEC 60919-1 (1988) ‘Performance ofhigh-voltage d.c. (HVDC)
systems — Part 1 :Steady-state conditions’ issued bythe International Electrotechnical Commission (IEC),
was adopted by the Bureau ofIndian Standards onthe recommendation ofHigh VoltageDirect Current Power
Systems Sectional Committee (ET 40) and approval ofthe Electrotechnical Division Council.
This International Standard is one ofthe series, which deals with performance of HVDC systems. The No.
ofthis IEC Publication [which wasearlier IEC 919-1(1988)] stands redesignated byIEC asmentioned above.
The series comprises ofthe following IEC standards:
Publication No.- Tltle
IEC60919-1( 1988) Performance ofHVDC systems — Part 1:Steady-state conditions
tEC60919-2( 1990) Performance ofHVDC systems — Part 2:Faults and switching
IEC60919-3( 1999) Performance ofHVDC systems— Part 3:Dynamic conditions
This standard (Part 1)being identical with IEC 60919-1, the other parts ofthis Indian Standard aligning with
other parts of IEC 60919 will be taken up in due course. Certain conventions are, however, not identical to
those used in the Indian Standards. Attention is drawn particularly to the following:
a) Wherever the words ‘International Standard’ appear referring tothis standard, they should be read
as Indian Standard, and
b) Comma ( ,) has been used as the decimal marker while in Indian Standards, the current practice
isto use apoint ( .)asa decimal marker.
Only the English text ofthe IEC publication has been retained while adopting it as Indian Standard, and as
such the page numbers given her e are not same asin IEC publication.

The two digits, three digits and fou r digits IEC publication No.(s) stand redesignated byprefix 600, 60 and
6respectively; for example IEC 99-1 and IEC 605-1 stand redesignated as IEC 60099-1 and IEC 60605-2 and
IEC 1071-1 stand redesignated as IEC 61071-1 respectively.
CROSSREFERENCES
Inthis adopted Indian Standard, reference appearstocertain Internatioml Standards forwhich Indian Standards
also exist. The corresponding Indian Standard which are tobe substituted in their respective places are listed
along with the latest IEC Publications, besides giving the degree ofequivalence:
IEC Pub No. Latest IEC Title of the Latest Correspond- Title of Indian Degree of
with Year Pub No. IEC Publication ing Indian Standard Equivalence
Referred to with Year Standard
50(11): 1956 60050-551 International Electro- 1885 Electrotechnical Identical to
superseded by 50 (1998) technical Vocabulary (Part 27): vocabulary: Part 27 IEc 60050
(551 )( 1982) — Part 551 : Power 1993 Power electronics (551)(1982)
electronics
50(37): 1%6 60050-351 International Electro- 1885 Electrotechnical Identical to
superseded by (1998) technical Vocabulary (Pati75): vocabulary :Part 75 IEC60050
50 (351) (1975) —Part351 :Automatic 1993 Automatic control (351)(1975)
control

(i)
IS 14902 (Part 1) :2001
lEC 60919-1( 1988)
lb:(”’Pub No, Latest IEC Title of the Latest Correspond- Title of Indian Degree of
with lkar Pub No. IEC Publication ing Indian Standard Equivalence
Referred to with Year Standard
50(131):1978 60050-131 International Electro- 1885 Electrotechnical Identical
(1978) technical Vocabulary (Rut 57): vocabulary :Part 57
— Electrical and 1993 Electrical and
‘magneticcircuit magnetic circuit
50(441):1984 60050-441” International Electro- 1885 Electrotechnical Not
(1984) technical Vocabulary (IM 17): vocabulary :Part 17 equivalent
— Switchgear control- 1979 Switchgear control-
gear and fuses gear
50(601):1985 60050601 International Electro- 1885 Electrotechnical Identical
(1985) technical Vocabulary (Rat 78) : vocabulary: Part 78
— Chapter 601 : 1993 Generation transmi-
Generation transmis- ssion and distribu-
sion and distribution tion of electricity —
ofelectricity—general General
50(602):(1983) 60950602 International Electro- 1885 Electrotechnical do
(1983) technical Vocabulary (Part69) : vocabulary: Part 69
— Chapter 601 : 1993 Generation transmi-
Generation transmis- ssion and distribu-
sionanddistribution of tion of electricity —
electricity generation Generation
50(603):(1986) 60050603 International Electro- IS1885 Electrotechnical do
(1986) technical Vocabulary (Part79) : vocabulary: Part 79
— Chapter 603 : 1993 CJeneratlon,transmi-
Generallon, transmits- ssion and distribu-
ion and distribution tion of electricity
ofelectricity —Power — Power system
system planning and planning and
management management

50(605):(1983) 6005W505 International Electro- IS1885 Electrotechnical do
(1983) technical Vocabulary (Part71) : vocabulary :Part 71
—Generation transmi- 1993 Generation transmi-
ssion and distribution ssion and distribu-
of electricity — Sub- tion of electricity
stations — Substations
50(902): (1973) 60050-161 International Electro- IS1885 Electrotechnical Not
(1990) technicai Vocabulary (Part 64/See 1 vocabulary :Part 64 equivalent
— Chapter 161 : and Sec2) : Electromagnetic
Electromagnetic com- 1987 compatibility,
patibility Section 1 General
and Section 2
Specific terms
76-4(1976) 60076-1 Power transformers IS2026 Powertransformers: “ do
(1993) —Part 1: General (Part4): 1977 Part 4 Terminal
correspond- markings, tappings
ing to IEC and connections
60076-4(1976)
99-1(1970) 60(W-1 Surge arrestors — IS3071 Lighlnmg arrestor do
(1991) Part 1 : Non-linear (Part 1): 1985 for alternating

(ii)
IS 14902( Part 1) :2001
IEC 60919-1( 1986)
IEC Pub No. Latest IEC Title of the Latest Correspond- Title of Indian Degree of
with Year Pub No. IEC Publication ing Indian Standard Equivalence
Referred to with Year Standard
type gapped arrestors correspond- current systems :
for ac systems ing to IEC Part 1 Non-linear
60099-1 resistor type light-
(1970) ning arrestors
117(1966) 60617-1 Graphical symbols for IS12032 Graphical symbols Identical to
superseded by (1985) diagrams — Part 1 : (Rut 1): 1987 fordiagrams :Part 1 IEC60617-1
IEC617(1985) General information, General information, (1985)
general index, cross general index, cross
references and tables references and
tables
146 (1973) 60146-1-1 Semiconductor con- No 1SS — —
(1991) and vertors – Part 1– 1 :
60146-1-2 Basic requirements
(1991) and Part 1-2Applica-
tion guide
146-4(1986) 62040-3 Semiconductor con- No 1SS — —
(1999) vertors – Part 4 :
Method of specifying
the performance and
testing requirements
of unintemlpted
power systems
147(1966) 6074’7-5-2 Discretesemiconductor 3700 (Partl) Essentialratings and Not
(1997) and devicesandintegrated :1972 and characteristics of equivalent
60747-5-3 circuits — Part 5-2 : IS4400(Partl) semiconductor
(1997) Optoelectronics :1967—Both devices : Part 1
devices — Essential correspond- Generalandmethods
ratings and charac- ingtoIEC147 of measurements

teristics and Part 5-3: (1966) on semiconductor

Measuring methods devices
148 1969) 60748-1( 984) Semiconductordevices 1885 Electrotechnical do
andintegrated circuits (Part7/See1): vocabulary : Part 7
—Part 1: General 1972 Semiconductor
devices, Section 1
General
214(1976) 60214 (1989) On-load tap-changers 8468:1977 On-load tap- do
changers
271(1974) 60050-191 International Electro- 1885 Electrotechnical do
(1990) technical Vocabulary (Part39) : vocabulary: Part 39
— Part 191: Depend- 1979 Reliability of elect-
ability and quality of ronic and electrical
service items
272(1968) 60300-1 Dependability manage- No1SS — —
superseded by (1993) ment—Part 1:Depend-
IEC(300)(1984) ability management
programme
300(1984) 60300(1993) Dependability manage- No1SS —
in parts ment — Inparts
(iii )
IS 14902 (Part 1) :2001
IEC 60919-1( 1988)
IEC Pub No. Latest IEC Title of the Latest Correspond- Title of Indian Degree of
with Year Pub No. LEC Publication ing Indian Standard Equivalence
Referred to with Year Standard
354(1972) 60354 (1991) Loading guide for oil- 6600:1972 Guide for loading Not
immersed power trans- correspond- oil-immersed power equivalent
formers ing to IEC transformers
354(1972)
542(1976) 60542 (1976) Application guide for 8478:1977 Application guide do
on-load tap-changers for on-load tap-
changers
551(1976) 60551 (1987) Determination of 13964:1994 Methodsofmeasure- do
transformer and ment of transformer
reactor sound levels and reactor sound
levels
605-1(1978) 60605-1(1978) Equipment reliability 8161 Guideforequipment Identical to
testing : Part 1 — (Part 1):1999 reliability testing : EC 60605-1
General requirements Part 1 Principles (1978)
and procedures
606(1978) 60076-1 Powertransformers— 2026 Powertransformers: Not
(1993) Part 1: General (Rut 1)1977 Part 1General equivalent
617(1985) 60617-1(1985) Graphical symbols for 12032 Graphical symbols Identical
diagrams — Part 1 : (part 1): 1987 for diagrams :Part 1
General information, Generalinformation,
generalindex—Cross- generalindex– Cross
-referencetables reference tables
633(1978) 60633 (1998) Terminology for high- 14801:2000 Terminology for Identical to
voltage direct current high-voltage direct IEC60633
(1-IVDC)transmission current (1-rVDc) (1998)
transmission

651(1979) 60651 (197 9) Sound level meters 9779:1981 Sound-level meters Identical

700(“981) 60700- (1998) Thyristor valves for 14911 Thyristor valves for Identical to
EC
high-voltage direct (Part1):2001 high-voltage direct 60700-1
current (HVDc) current (I-IvDC) (1998)
transmission – Part 1: powertransmission :
Electrical testing Part 1 Electrical
testing
For the purpose ofdeciding whether aparticular requirement ofthis standard iscomplied with, the finaI value,
observed or calculated, expressing the result of a~est, shall be rounded off in ac~ordance with IS 2: 1960
‘Rulesfor rounding offnumerical values (revised)’. The number ofsignificant places retained in the rounded
offvalue should be the same as that ofthe specified value in this standard.

(iv)
IS 14902 (Part 1) :2001
IEC 60919-1 ( 1988)
Page
clause
SECTION ONE – GENERAL
I. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. ReferencetootheclECpublications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SECTION TWO – OUTLINE OF ST’EADY-ST.ATEHVDC SYSTEM PERFORMANCE SPECIFICATION
3. Steady-stateperformancespecification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SECTION THREE – TYPES OF HVDC SYSTEMS
4. General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. HVDCback-to-backties. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6. MonopolarearthreturnHVDCsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7. MonopolarmetallicreturnHVDCsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8. BipolarHVDCsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
9. Bipolarmetallicneutralsystem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.Two12-pulsegroupsperpole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
11.Convertortransformerarrangements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
12.D.C.switchingconsiderations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SECTION FOUR – ENVIRONMENT
13.1nformationtobesupplied. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTIONFIVE-- RATED POWER,CURRENT AND VOLrA~E
14.Ratedpower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
15.Ratedcurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
16.Ratedvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SECTION SIX – OVERLOAD AND EQUIPMENT CAPABILITY
17. Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
18. Equipmentcapability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SECTION SEvEN – MI NIhIUM POWERTRANsFER ANDNO-LOADSTAND-D’STATE
19. General, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
20. Minimumcurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
21. Reduceddirectvoltageoperation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

22. No-loadstand-bystate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SECTION EIGHT – A.C. SYSTEM
23. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
24. A.C.voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
25. Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
26. Systemimpedanceatfundamental frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
27. Systemimpedanceatharmonicfrequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
28. Positiveandzerosequencesurgeimpedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
29. Othersourcesofharmonics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
30. Subsynchronousresonance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SECTION NINE - REACTIVE POWER
31. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
32. Convertorreactivepowerconsumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
33. Reactivepowerbalancewiththea.c. system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
34. Reactivepowersupply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
35. Maximumsizeofswitchablevarbanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
SECTION TEN – D.C. LINE. ELECTRODE LINE AND EARTH ELECTRODE
/
36. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
37. Overheadline(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1
IS 14902 (Part 1) :2001
IEC 60919-1 ( 1988)
clause Page
38. Cable line(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
39. Electrodeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
40. Earthelectrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SECIION ELWEN – RELIABILITY
41. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . 26
42. outage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
43. Periodhours(PH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
44. Base-powerlevel(P~) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
45. Energyunavailability(EU).. . . . . . . . . . . . . . . . . . . . . . . . . . . 27
46. Energyavailability(E,4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
47. Maximumpermittednumberofforced outages, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
48. Statisticalprobabilityofoutages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
SECrION TwEJ. v~– CONTROL AND METERING
49. Controlobjectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
50. Controlstructure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5i. Controlordersettings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
52. C’urrentlimits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
53. Controlcircuitredundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
54. Metering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
SECTION THIRrtEN -- TELECOMMUNICATION
55. Typesoftelecommunication links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
56.TelepfrOne . . . . . . . 34
57. Powerlinecarrier(PLC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
58. Microwave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
59. Radioiink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
60. OpticalteIecommunication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
61. Classificationofdatatobetransmitted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
62. Fastresponsetelecommunication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
63. Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SsKncm Fo[w~[-~ – AUXILIARY POWERSUPPLIFS
64. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
65. Reliabilityandloadclassification . . . . . . . . . . . . . . . . . . . . 36
66. A.C.auxiliarysupplies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

67. Batteriesanduninterruptiblesupplie s(UPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
68. Emergencysupply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
SWTION FII_rii~N – AUDIBLE NOISE
69. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
70. Publicnuisance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
71. Noiseinworkingareas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
SECTION SIXTEEN – HARMONIC INTERFERENCE – A.C.
72. A.C.sideharmonicgeneration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
73. Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
74. lnterferencedisturbancecriteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
75. Levelsforinterference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
76. Fllterperformance . . . . . . . . . . . . . . . . . . . 43
SECTION SEVENTLLN –
77. D.C.sideinterference . , . . . . . . 43
78. D.C.filterperformance . . . . . 45
79. Specification requirements . 46
SKTION EIGHIt~\ -. POWER LINE CARRIER INIERFE.RENCE
80. Cieneral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
81. Performancespecification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

2