Single Line Diagram for Generator and Gen. Protection & Metering (660 Mw)

(1)

TIRORA COAL – FIRED POWER PLANT PROJECT

(5 X 660 MW)

SINGLE LINE DIAGRAM FOR

GENERATOR

AND

(2)

2

SLD FOR GENERATOR AND GEN. PROTECTION & METERING:-

G

E

N

N.G.T. TA4:25000 / 5A 0.2S 100VA TA3:25000 / 5A 5P40 60VA TA2:25000 / 5A 5P40 60VA TA1:25000 / 5A 5P40 60VA TA5:25000 / 5A 0.2 100VA TA6:25000 / 5A 0.2 100VA TA7:25000 / 5A 5P40 60VA TA8:25000 / 5A 5P40 60VA TA9:400 / 5A 5P20 60VA TA12:7500 / 5A 5P20 60VA TA13:7500 / 5A 5P20 60VA TA14:7500 / 5A 0.5 30VA TA10:400 / 5A 5P20 60VA TA11:400 / 5A 0.5 30VA

+

-

AVR ET TO GT & UT GPP - A GPP - B GTP & AVR AVR GEMP GPP - A

TO GEN. & UT PROT. PANEL USING FOR OVERALL DIFFERENTIAL PROTECTION GPP – A, GPP – B - GFR GPP - B GPP - A GPP - B GTP GPP - B GPP - A SPARE GFR PT / LA CABINET TA0: 5 / 5A 0.5 30VA G P P A GPP – B, GTP & AVR G P P – A , G E M P G P P – B - G F R CA BL E GPP – A GPP – B TO GEN. SHAFT GTP EARTHING IPBD IPBD DC ENB AC ENB 415 V MCC 22 KV

(3)

SR.NO. CT CODE CT DESCRIPTION PANEL USES QTY 1 TA0 5 / 5A, 0.5, 30VA GENERATOR FAULT

RECORDER USING FOR RECORD 1 2 TA1 25000 / 5A, 5P40, 60VA TO GEN. & UT PROT. PANEL USING FOR OVERALL DIFFERENTIAL

PROTECTION 3

3 TA2 25000 / 5A, 5P40, 60VA GENERATOR PROTECTION PANEL- A

GEN. DIFFERENTIAL (87G1 ) Id / I

3 THERMAL OVERLOAD (49G1) I> m=3

STARTUP / SHUTDOWN (59G1) I>

NEGATIVE PHASE SEQUENCE OVERCURRENT (46G1) I> m≠ 3

VOLTAGE RESTRAINED OVERCURRENT (51VG1) U<, I>

BACK-UP IMPEDANCE (21G1) Z<

4 TA3 25000 / 5A, 5P40, 60VA GENERATOR PROTECTION PANEL- B

GEN. DIFFERENTIAL (87G2 ) Id / I

3 THERMAL OVERLOAD (49G2) I> m=3

STARTUP / SHUTDOWN (59G2) I>

NEGATIVE PHASE SEQUENCE OVERCURRENT (46G2) I> m≠ 3

VOLTAGE RESTRAINED OVERCURRENT (51VG2) U<, I>

(4)

4

BTG - ELECTRICAL

CT DETAILS FOR GENERATOR PROTECTION & METERING

SR.NO. CT CODE CT DESCRIPTION PANEL USES QTY 5 TA4 25000 / 5A, 0.2S, 100VA ENERGY METER PANEL USING FOR METERING (MAIN METER &

BACKUP METER) 3 6 TA5 25000 / 5A, 0.2 100VA EXCITATION CONTROL

PANEL (AVR) USING FOR EXCITATION SYSTEM 3 7 TA6 25000 / 5A, 0.2 100VA GENERATOR TRANSDUCER

PANEL & AVR

USING FOR CONVERT 4 - 20mA FOR DCS &

EXCITATION SYSTEM 3

8 TA7 25000 / 5A, 5P40, 60VA GENERATOR PROTECTION PANEL- B GEN. DIFFERENTIAL (87G2 ) Id / I 3 LOSS OF EXCITATION (40G2) Ф< LOSS OF STEP (68/78 G2) dz/dt> REVERSE POWER (32G2) _P

GENERATOR BACK - ENERGIZATION (50 / 27 G2) I> U>

LOW FORWARD POWER (37 G2) P<

9 TA8 25000 / 5A, 5P40, 60VA GENERATOR PROTECTION PANEL- A GEN. DIFFERENTIAL (87G1 ) Id / I 3 LOSS OF EXCITATION (40G1) Ф< LOSS OF STEP (68/78 G1) dz/dt> REVERSE POWER (32G1) _P

GENERATOR BACK - ENERGIZATION (50 / 27 G1) I> U>

LOW FORWARD POWER (37 G1) P<

(5)

SR.NO. CT CODE CT DESCRIPTION PANEL USES QTY

10 TA9 400 / 5A, 5P20, 60 VA GENERATOR PROTECTION PANEL- A

EXCITATION TRANSFORMER

INSTANTANEOUS OVERCURRENT (50SET1) Is>

3 EXCITATION TRANSFORMER

OVERCURRENT (51ET1) I>

11 TA10 400 / 5A, 5P20, 60 VA

GENERATOR PROTECTION PANEL- B

EXCITATION TRANSFORMER

INSTANTANEOUS OVERCURRENT (50SET2) Is>

3 EXCITATION TRANSFORMER

OVERCURRENT (51ET2) I> GENERATOR FAULT

RECORDER USING FOR RECORD 12 TA11 400 / 5A, 0.2, 30 VA

GENERATOR

TRANSDUCER PANEL & AVR

USING FOR CONVERT 4 - 20mA FOR DCS &

EXCITATION SYSTEM 3 13 TA12 7500 / 5A, 5P20, 60

VA

GENERATOR PROTECTION PANEL- B

EXCITATION TRANSFORMER THERMAL

OVERLOAD (49ET2) 3I> 3 14 TA13 7500 / 5A, 5P20, 60

VA

GENERATOR PROTECTION PANEL- A

EXCITATION TRANSFORMER THERMAL

OVERLOAD (49ET1) 3I> 3

(6)

6

PURCHASER

SICHUAN MECHANICAL EQUIPMENT IMPORT –

EXPORT CO. LTD. (SCMEC)

BARGAINOR

SHANGHAI ELECTRIC POWER GENERATION CO.

LTD. GENERATOR PLANT

DESIGN UNIT

SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE

(SWEPDI)

(7)

SPECS AND MODE

GENERATOR MODEL QFSN-660-2 RATED CAPACITY SN MVA 776

RATED POWER PN MW 660

RATED POWER FACTOR COSΦN 0.85 (LAG) RATED VOLTAGE UN KV 22

RATED CURRENT IN A 20377 RATED FREQUENCY FN HZ 50 RATED ROTATION SPEED NN RPM 3000 RATED EXCITATION VOLTAGE UFN V 494 RATED EXCITATION CURRENT IFN/

NO-LOAD EXCITATION CURRENT IFOZ A 4690/1497 STATOR WINDING CONNECTION MODE YY

COOLING MODE WATER, H2, H2

VENTILATION MODE TAKE GAS FROM THE AIR GAP EXCITATION MODE STATIC EXCITATION

(8)

8

DESCRIPTION UNIT DESIGN VALUE

PARAMETER PROPERTY

DC RESISTANCE FOR EACH PHASE OF THE STATOR （75℃） W 1.447×10-3 DC RESISTANCE FOR WINDING OF THE ROTOR （75℃） W 0.1004 GROUND CAPACITANCE FOR EACH PHASE OF THE STATOR

A ΜF 0.229

B ΜF 0.229

C ΜF 0.229

SELF INDUCTANCE OF THE ROTOR WINDING H 0.762 DIRECT AXIS SYNCHRO REACTANCE XD % 226 HORIZONTAL AXIS SYNCHRO REACTANCE XQ % 220 DIRECT AXIS TRANSIENT REACTANCE (NON-SATURATED

VALUE) X'DU

% 31.3

DIRECT AXIS TRANSIENT REACTANCE (SATURATED VALUE)X'D % 27.5

HORIZONTAL AXIS TRANSIENT REACTANCE (NON-SATURATED VALUE) X'QU

% 46

HORIZONTAL AXIS TRANSIENT REACTANCE (SATURATED VALUE)X'Q

% 40.5

(9)

PARAMETER PROPERTY DIRECT AXIS SUPER-TRANSIENT REACTANCE (NON-SATURATED

VALUE) X"DU

% 23.2

DIRECT AXIS SUPER-TRANSIENT REACTANCE (SATURATED VALUE)X"D

% 21.4

HORIZONTAL AXIS SUPER-TRANSIENT REACTANCE (NON-SATURATED VALUE) X"QU

% 22.8

HORIZONTAL AXIS SUPER-TRANSIENT REACTANCE (SATURATED VALUE) X"Q

% 20.9

NEGATIVE SEQUENCE REACTANCE (NON-SATURATED VALUE) X2U % 23 NEGATIVE SEQUENCE REACTANCE (SATURATED VALUE) X2 % 21.2 ZERO SEQUENCE REACTANCE (NON-SATURATED VALUE) XOU % 10.7 ZERO SEQUENCE REACTANCE (SATURATED VALUE)X0 % 10.2 DIRECT AXIS OPEN CIRCUIT TRANSIENT TIME CONSTANT T'DO S 8.73 HORIZONTAL AXIS OPEN CIRCUIT TRANSIENT TIME CONSTANT

T'QO

S 0.97

(10)

10

HORIZONTAL AXIS SHORT CIRCUIT TRANSIENT TIME CONSTANT T'Q

S 0.179

DIRECT AXIS OPEN CIRCUIT TRANSIENT TIME CONSTANT T"DO

S 0.045

HORIZONTAL AXIS OPEN CIRCUIT TRANSIENT TIME CONSTANT T"QO

S 0.068

DIRECT AXIS SHORT CIRCUIT SUPER TRANSIENT TIME CONSTANT T"D

S 0.035

HORIZONTAL AXIS SHORT CIRCUIT SUPER TRANSIENT TIME CONSTANT T"Q

S 0.035

DE-EXCITATION TIME CONSTANT TDM S 3 FLYWHEEL MOMENT GD2 T-M2 41 SHORT CIRCUIT RATIO SCR 0.518 STEADY STATUS NEGATIVE SEQUENCE CURRENT I2 % 8 TRANSIENT STATUS NEGATIVE SEQUENCE

CURRENTI22T

S 8

(11)

PARAMETER PROPERTY ALLOWABLE FREQUENCY DEVIATION

±%

+3

-5

ALLOWABLE STATOR VOLTAGE DEVIATION ±% 5 DE-EXCITATION ASYNCHRONOUS RUN CAPABILITY MW

SEE 4.2.13.4 DE-EXCITATION ASYNCHRONOUS RUNTIME MIN

LEADING PHASE RUN CAPABILITY MW 660

LEADING PHASE RUNTIME (H FOR RUN HOUR) H

0.95PF (ADVANCE) LONG TERM CONTINUOUS RUN

THF TELEPHONE HARMONIC FACTOR % KU VOLTAGE WAVEFORM SINUS DISTORTION RATE KU %

THREE PHASE SHORT CIRCUIT STEADY STATUS CURRENT % 162 TRANSIENT STATUS SHORT CIRCUIT CURRENT EFFECTIVE (AC

COMPONENT)

PHASE-NEUTRAL POINT % 584

PHASE-PHASE % 407

(12)

12

SUB-TRANSIENT STATUS SHORT CIRCUIT CURRENT

EFFECTIVE VALUE (AC COMPONENT)

PHASE-NEUTRAL POINT % 633

PHASE-PHASE % 453

THREE PHASE % 520

THREE PHASE SHORT CIRCUIT MAXIMUM CURRENT VALUE

(INCLUDING DC COMPONENT PEAK VALUE) % 1200 PHASE-PHASE SHORT CIRCUIT MAXIMUM

ELECTROMAGNETIC TORSION T.M 2130

ROTOR AXIAL VOLTAGE V

BEARING INSULATION RESISTANCE NORMAL/MINIMUM

VALUE MW

MAXIMUM ALLOWABLE OVER-SPEED % 120

OUT OF STEP POWER MW 1260

GENERATOR STATUS RUN CAPABILITY S

PEAK ADJUSTMENT CAPABILITY

ALLOWING 10000TIMES MACHINE START/STOP. GENERATOR SERVICE LIFE YEAR 30

NOISE DB 90

(13)

VIBRATION VALUE

CRITICAL SPEED (FIRST ORDER) R/MIN 690 CRITICAL SPEED (SECOND ORDER) R/MIN 1935 CRITICAL SPEED BEARING VIBRATION VALUE

VERTICAL MM

HORIZONTAL MM BEARING VIBRATION VALUE IN CASE OF OVER-SPEED

VERTICAL MM

HORIZONTAL MM BEARING VIBRATION VALUE IN CASE OF RATED

ROTATION SPEED

VERTICAL MM

HORIZONTAL MM CRITICAL SPEED AXIS VIBRATION VALUE

(14)

14

VIBRATION VALUE

HORIZONTAL MM AXIS VIBRATION VALUE IN CASE OF

OVER-SPEED VERTICAL MM HORIZONTAL MM AXIS VIBRATION VALUE IN CASE OF

RATED ROTATION SPEED VERTICAL MM HORIZONTAL MM FV STATOR WINDING TERMINAL

VIBRATION FREQUENCY HZ STATOR WINDING TERMINAL

VIBRATION AMPLITUDE VALUE MM

≤0.1（1.0 U_N NO-LOAD OR 1.0 I _N SHORT CIRCUIT. ）

AXIAL TORSIONAL FREQUENCY HZ

(15)

LOSS AND EFFICIENCY ( UNDER RATED CONDITIONS)

STATOR WINDING COPPER LOSS QCU1 KW 1803 STATOR IRON LOSS QFE KW 637 EXCITATION LOSS QCU2 KW 2208 SHORT CIRCUIT ADDITIONAL LOSS

QKD KW 1055 MECHANICAL LOSS QM KW 1607 EXCITATION MACHINE AND

EQUIPMENT LOSS KW TOTAL LOSS ΣQ KW 7310

(16)

16

INSULATION GRADE AND TEMPERATURE

STATOR WINDING INSULATION GRADE F WINDING OUTLET WATER TEMPERATURE UNDER

STATOR WINDING THA WORK CONDITIONS ℃ 74 WINDING OUTLET WATER TEMPERATURE UNDER

STATOR WINDING T-MCR WORK CONDITIONS ℃ WINDING OUTLET WATER TEMPERATURE UNDER

STATOR WINDING VWO WORK CONDITIONS ℃ INTERLAYER TEMPERATURE UNDER STATOR WINDING

THA WORK CONDITIONS ℃ 79 INTERLAYER TEMPERATURE UNDER STATOR WINDING

T-MCR WORK CONDITIONS ℃ INTERLAYER TEMPERATURE UNDER STATOR WINDING

VWO WORK CONDITIONS ℃ STATOR IRON CORE INSULATION GRADE F

(17)

DESCRIPTION UNIT VALUE

INSULATION GRADE AND TEMPERATURE

HOTTEST POINT TEMPERATURE UNDER STATOR IRON

CORE THA WORK CONDITIONS ℃ 88 HOTTEST POINT TEMPERATURE UNDER STATOR IRON

CORE T-MCR WORK CONDITIONS ℃ TEMPERATURE UNDER STATOR TERMINAL STRUCTURE

PART THA WORK CONDITIONS ℃ TEMPERATURE UNDER STATOR TERMINAL STRUCTURE

PART T-MCR WORK CONDITIONS ℃ TEMPERATURE UNDER STATOR TERMINAL STRUCTURE

PART VWO WORK CONDITIONS ℃ ROTOR WINDING INSULATION GRADE F TEMPERATURE UNDER ROTOR WINDING THA WORK

CONDITIONS (RESISTANCE METHOD) ℃ 92 TEMPERATURE UNDER ROTOR WINDING T-MCR WORK

(18)

18

EXCITAION TRANSFORMER

TYPE SINGLE PHASE DRY TYPE

MODEL

CAPACITY KVA 3×2950

MANUFACTURER JINPAN/SHUNTE RATED VOLTAGE RATED VOLTAGE

PRIMARY KV 22 PRIMARY V

1060

FREQUENCY HZ 50 PHASE NO. 3

CONNECTION GROUP CATEGORY Ｙ/△-11 TERMINAL LEAD-OUT AND

GROUNDING MODE

INSULATION GRADE F

(19)

EXCITAION TRANSFORMER INSULATION WITHSTAND VOLTAGE KV IMPACT VOLTAGE KV HIGH SIDE 125

LOW SIDE

HIGH SIDE KV LOW SIDE 50 PROTECTION GRADE IP23 COOLING MODE AN/AF

LOSS

COPPER LOSS KW 26 IRON LOSS KW 14 LOSS ADDITIONAL LOSS KW 9 LOSS TOTAL LOSS KW 49 EFFICIENCY ％ 99.8

(20)

20

EXCITAION TRANSFORMER

VOLTAGE REGULATION ％ ±5 IMPEDANCE VOLTAGE ％ 8 POSITIVE SEQUENCE IMPEDANCE ％ 8 ZERO SEQUENCE IMPEDANCE ％ 7.2

HIGH VOLTAGE WINDING RESISTANCE Ω 3×0.1138 EXCITATION CURRENT A 0.9

NOISE LEVEL DBA 70

OVERLOAD CAPACITY OVERLOAD CAPACITY KVA 1.1 LONG TERM

TRANSFORMER TEMPERATURE SIGNAL I SECTION OVER TEMPERATURE ALARM

II SECTION OVER TEMPERATURE TRIPPING

TRANSFORMER MAXIMUM ALLOWABLE TEMPERATURE RISE

100K

EXTERNAL SIZE (L×W×H) MM 3400×1520×2950 TRANSPORT SIZE (L×W×H) MM 4100×2600×2950

WEIGHT T 19.6

(21)

EXCITATION POWER CABINET

TYPE

THYRISTOR POWER ELEMENT RATED VOLTAGE V RATED CURRENT A 2075 REVERSE PEAK VOLTAGE V 4200 RATED CURRENT A 1700

COOLING MODE FORCE WIND COOLING ELEMENT NO. SERIES CONNECTIONS FOR EACH

CABINET AND EACH BRIDGE ARM

PCS 1

PARALLEL CONNECTION BRANCH NO. FOR EACH CABINET AND EACH BRIDGE ARM

PCS 6

RECTIFICATION CABINET NOISE DB ≤65DB BLOWER FAN AVERAGE NO-FAULT TIME H 45000 POWER CABINET NO. 5 CURRENT SHARING FACTOR 0.95 Voltage sharing factor

(22)

22

MAGNETIC FIELD BREAKER

RATED VOLTAGE V 2000 RATED CURRENT RATED CURRENT A 6000

BREAKING CURRENT A 75000

CONTROL VOLTAGE (DC) VD.C 220

MAX. ARC VOLTAGE（ABOVE 2000V） V 2800

MANUFACTURER ABB

MODEL HPB60M-82S

(23)

AVR PROPRTY

VOLTAGE REGULATION ％ 30%～110% UG0 MANUAL REGULATION SCOPE ％ 10%IF0～110% IFN STATIC DIFFERENCE RATE ％ ±1

TRANSITION STATUS RESOLUTION MS SINGLE TIME RECORD LENGTH S TOTAL RECORD LENGTH S 1000 RISE TIME S ≤0.04 CONTROL PERIOD MS SAMPLING MODE AC PHASE FREQUENCY MARGIN ° ≥40° AMPLITUDE FREQUENCY MARGIN DB ≥6DB CONTROL RULE PID MANUFACTURER

(24)

24

EXCITATION INITIATING CIRCUIT PARAMETER

EXCITATION INITIATING VOLTAGE V/AC 415

EXCITATION INITIATING CURRENT A 150

EXCITATION INITIATING POWER WASTE

KVA 65

ROTOR OVER VOLTAGE PROTECTION

OVER VOLTAGE NON LINEAR RESISTANCE CAPACITY

MJ 5

OVER VOLTAGE PROTECTION ACTION VOLTAGE VALUE

4UFN~6 UFN

(25)

TYPE & SPECIFICATION

UNIT

QUANTITY

UNIT # 1

UNIT # 2

UNIT # 3

TOTAL

SINGLE PHASE ISOLATOR: 22KV / 400A NGT: 22/0.22KV, 50KVA

SET 1 1 1 3 RESISTANCE: 0.4Ω, 50KW CT OF

NGT SECONDARY WIRING: 500/5A, 5P20

CT OF NGT PRIMARY WIRING: 5/5A, 0.5

(26)

26

TYPE & SPECIFICATION UNIT

QUANTITY

UNIT # 1 UNIT # 2 UNIT # 3 TOTAL

RN4 - 22, 0.5A Y5W1 - 24 / 61.6 SET 1 1 1 3

22/√3, 0.11/√3, 0.11/√3, 0.11/3 KV 0.2/3P/3P, 60VA SEMI-INSULATING 22/√3, 0.11/√3, 0.11/√3, 0.11/3 KV 0.2/3P/3P, 60VA SEMI-INSULATING 22/√3, 0.11/√3, 0.11/3, 0.11/3 KV 0.2/3P/3P, 60VA FULL-INSULATING

DETAILS OF PT / LA CABINET :-

(27)

SR.NO. GENERATOR PROTECTION PROTECTION CODE 1 GENERATOR DIFFERENTIAL PROTECTION 87G

2 VOLTAGE RESTRAINED OVER CURRENT PROTECTION 51VG）

3 GENERATOR BACK-UP IMPEDANCE 21G

4 STATOR EARTH FAULT 95% & 100% PROTECTION 64G1, 64G2

A) GENERATOR STATOR 95% EARTHING PROTECTION 64G1 (ZERO SEQUENCE VOLTAGE THEORY)

B) GENERATOR STATOR 100％ EARTHING PROTECTION 64G2 (THIRD-HARMONIC THEORY) 5 STATOR INTER-TURN FAULT PROTECTION 95G

6 ASYMMETRIC NEGATIVE PHASE SEQUENCE OVER CURRENT

PROTECTION 46G

7 SYMMETRICAL THERMAL OVERLOAD PROTECTION 49G）

8 OVER/UNDER VOLTAGE PROTECTION 59/27G

9 OVER/UNDER FREQUENCY PROTECTION 81G

(28)

28

SR.NO GENERATOR PROTECTION PROTECTION CODE

11 REVERSE POWER PROTECTION 32G 12 LOW FORWARD POWER PROTECTION 37G 13 GENERATOR OUT OF STEP PROTECTION 78G 14 OVER EXCITATION PROTECTION 61G 15 GENERATOR BACK-ENERGIZATION PROTECTION 51BEG 16 GENERATOR ROTOR EARTH FAULT PROTECTION 64F1、64F2 17 STARTUP/SHUTDOWN PROTECTION 59G 18 GENERATOR COOLING WATER-LOSS PROTECTION 30G 19 HEAT ENGINEERING PROTECTION （30T） 20 ET INSTANTANEOUS OVERCURRENT PROTECTION 50SET

(29)

SR.NO GENERATOR PROTECTION PROTECTION CODE

21 ET OVERCURRENT PROTECTION 51ET

22 ET EXCITATION WINDING THERMAL OVERLOAD PROTECTION 49ET

23 ET WINDING TEMPERATURE PROTECTION ET26W

24 CT, VT SUPERVISION PROTECTION 97，60

25 UNIT EMERGENCE TRIPPING INTERFACE

26 EXCITATION SYSTEM FAULT TRIPPING INTERFACE

(30)

30

SLD FOR GENERATOR AND GEN. PROTECTION & METERING:-

GEN

N.G.T. TA4:25000 / 5A 0.2S 100VA TA3:25000 / 5A 5P40 60VA TA2:25000 / 5A 5P40 60VA TA1:25000 / 5A 5P40 60VA TA5:25000 / 5A 0.2 100VA TA6:25000 / 5A 0.2 100VA TA7:25000 / 5A 5P40 60VA TA8:25000 / 5A 5P40 60VA TA9:400 / 5A 5P20 60VA TA12:7500 / 5A 5P20 60VA TA13:7500 / 5A 5P20 60VA TA14:7500 / 5A 0.5 30VA TA10:400 / 5A 5P20 60VA TA11:400 / 5A 0.5 30VA

+

-

AVR ET TO GT & UT GPP - A GPP - B GTP & AVR AVR GEMP GPP - A

TO GEN. & UT PROT. PANEL USING FOR OVERALL DIFFERENTIAL PROTECTION GPP – A, GPP – B - GFR GPP - B GPP - A GPP - B GTP GPP - B GPP - A SPARE GFR PT / LA CABINET TA0: 5 / 5A 0.5 30VA G P P A GPP – B, GTP & AVR G P P – A , G E M P G P P – B - G F R CA BL E GPP – A GPP – B TO GEN. SHAFT GTP EARTHING IPBD IPBD DC ENB AC ENB 415 V MCC 22 KV 1060V

(31)

(32)

32