FOR INFORMATION
FOR APPROVAL
A
13.01.’14
REV.
DATE
Issue for approval
M.J.OH
Y.J.SHIN
M.D.SEO
DESCRIPTION
DSGN
CHKD
APPD
SUB-CONTRACTOR’S DOCUMENT NUMBER: MD1-0-V-111-33-00852
A
13.01.’14
Issuefor forinformation approval Issue
J.A.SEO
M.K.LEE
J.Y.KIM
REV.
DATE
DESCRIPTION
DSGN
CHKD
APPD
PROJECT :
TWO(2) x 500 MW MONG DUONG 1 THERMAL POWER PLANT EMPLOYER :
CONSULTANT :
CONTRACTOR :
SUB-CONTRACTOR :
DESIGNED BY
DATE
TITLE :
M.J.OH
13.01.’14
CHECKED BY
DATE
Y.J.SHIN
13.01.’14
APPROVED BY
DATE
PROJECT NUMBER
DOCUMENT NUMBER
REV.
M.D.SEO
13.01.’14
ADB/MD1-TPIP/EPC150911
MD1-0-V-111-33-00852
A
GENERATOR PROTECTION RELAY SETTING CALCULATION
TABLE OF CONTENT 1.0
PURPOSE ..................................................................................................................... 3
2.0 REFERENCES .................................................................................................................. 3
3.0 CONSIDERATION FOR RELAY SETTING....................................................................... 3
4.0 COMMENTS ...................................................................................................................... 3
5.0 CALCULATIONS ............................................................................................................... 4
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1.0 PURPOSE The purpose of this protection relay co-ordination setting study is to analyze and give the functional settings of the protection relays necessary for the operation of the protection system and for selective clearance of faults for Mong Duong1thermal power plant.
2.0 REFERENCES 1) 2) 3) 4) 5) 6) 7) 8) 9)
IEEE Std C37.91: IEEE Guide for Protective Relay Applications to Power Transformers. IEEE Std. C37.102 IEEE Guide for AC Generator Protection. IEEE Std 242: IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power System. IEC International Standard 60255-3 : Electrical Relays part3 – Single input energizing quantity measuring relays with dependent or independent time IEC International Standard 60255-8 : Electrical Relays part8 – Thermal electrical relays IEC International Standard 60076-5 : Power Transformer part 5 – Ability to withstand short circuit NEMA MG1-1998 Rev.2 2001 SIEMENS 7UM62XX Relay Technical Manual Relay Co-ordination Guide Book–Korea Electric Power Corporation
3.0 CONSIDERATION FOR RELAY SETTING 1) 2)
27/59N (100% Stator Earth ground fault Relay) settings are applied after the actual measurement. The permissible Negative sequence constants(K) of the generator is assumed to be 10. (K=10)
4.0 COMMENTS 1)
If all of vendor technical data are provided report will be review and revised in the next revision stage.
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5.0 CALCULATIONS
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5.1 Generator Protection Relay 1) Basic Information and Data 1-1) Relay Data Relay Maker Relay Model
Function
87G 21G 32G 40G 46G 49S 81G 27G 59G 50BF 24G 59GN 27/59TN 60G
SIEMENS 7UM6225 Differential Protection Impedance Protection Reverse Power Protection Under excitation (Loss-of-Field) Protection Unbalanced Load (Negative Sequence) Protection Thermal Overload Protection Frequency Protection Undervoltage Protection Overvoltage Protection Breaker Failure Protection Over excitation (Volt/Hertz) Protection 90-%-Stator Earth Fault Protection 100-%-Stator Earth Fault Protection with 3rd Harmonics Fuse Failure Monitor
1-2) Generator Data Parameter Rated MVA Power Factor (Overexcited) Direct axis synchronous reactance (Xd) Direct axis transient reactance (X’d) Direct axis sub-transient reactance (X”d) Negative sequence reactance (X2) Zero sequence reactance (Xo) Rated voltage Rated current a.
Data 650.52 0.85 2.10 0.225 0.160 0.160 0.140 21 17884.7
Unit MVA PU PU PU PU PU kV A
Remark
Saturation Saturation Saturation Calculation a.
Rated current
I NS
650520 17884.7 [ A] 3 21
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2) Protection Diagram
2-1)
Device Configuration Parameters – address blocks 1
a. Setting group change option ∴ Setting group change option is Enabled Address 0103 0104 0112 0113 0114 0116 0117 0120 0130 0131 0132 0133 0140 0141
Parameter Setting Group Change Option Fault values 50/51 Overcurrent Protection I> 50/51/67 Overcurrent Protection I>> 51V Inverse O/C Time Protection 49 Thermal Overload Protection 46 Negative Sequence Protection 87G/87TDifferential Protection 40 Under excitation Protection 32R Reverse Power Protection 32F Forward Power Supervision 21 Impedance Protection 27 Undervoltage Protection 59 Overvoltage Protection
MD1-0-V-111-33-00852
Setting Value
Remark
Disabled Instantaneous values Disabled Disabled Disabled Enabled Enabled Generator/Motor Enabled Enabled Disabled Enabled Enabled Enabled 6 of 22
Address 0142 0143 0144 0150 0151 0152 0154 0155 0160 0165 0166 0170 0171 0180 0181 0182 0185 0186 0187 0188 0189 0190 0191 2-2)
Parameter 81 Over / Under frequency Protection 24 Over excitation Protection (U/f) 27 Inverse Undervoltage Protection Up< 59N/67GN Stator Ground Fault Protection 50N/51G Sensitive Ground Current Protection 27/59TN Ground Fault Prot. 3rd Harm. 50N/51G Sensitive Earth Current Protection B Interturn Protection 64 Rotor Ground Fault Protection (R, fn) 48 Motor Starting Time Supervision 66 Restart Inhibit for Motors 50BF Breaker Failure Protection 50/27 Inadvertent Energisation 60FL Fuse Failure Monitor Measured Values Supervision 74TC Trip Circuit Supervision Threshold Supervision External Trip Function 1 External Trip Function 2 External Trip Function 3 External Trip Function 4 External Temperature Input Ext. Temperature Input Connection Type
Setting Value
Remark
Enabled Enabled Disabled Non-directional only V0 Disabled Enabled Disabled Disabled Disabled Disabled Disabled Side 2 Disabled Enabled Enabled Disabled Enabled Disabled Disabled Disabled Disabled Disabled 6 RTD simplex operation
Power System Data – address blocks 2
Address 0242 0244 0270 0271 0272 0274A 0276
Parameter - Group Power System Starpoint of Side 1 is Starpoint of Side 2 is Rated Frequency Phase Sequence Scheme Configuration Storage of th. Replicas w/o Power Supply Unit of temperature measurement
221 222 223
- Group Generator/Motor – Rated Primary Voltage Generator/Motor Rated Apparent Power of the Generator - Group CT’s – CT-Strpnt. Side1 in Direct. of Object CT Rated Primary Current Side 1 CT Rated Secondary Current Side 1 Correction Angle CT W0 CT Ratio Prim./Sec. Iee1 CT-Strpnt. Side2 in Direct. of Object CT Rated Primary Current Side 2 CT Rated Secondary Current Side 2 CT Ratio Prim./Sec. Iee2 - Group VT’s – Rated Primary Voltage Rated Secondary Voltage (Ph-Ph) UE Connection
224
VT Ratio Prim./Sec. Neutral VT
0251 0252 0201 0202 0203 0204 0205 0210 211 212 213
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Setting Value
Remark
Isolated Isolated 50 Hz ABC Direct connected to busbar NO Degree Celsius 21.00 kV 650.52 MVA YES 21000 A 5A 0.00 ° 60.0 YES 21000 A 5A 1.0
Not relevant
21.00 kV 110 V VN connected to neutral transformer 87.5 7 of 22
Address 225 280 281 295 296 297
2-3)
Parameter Matching Ratio Ph.-VT to Broken-Delta-VT - Group Breaker – Minimum TRIP Command Duration Closed Breaker Min. Current Threshold - Group Transducer – Transducer 1 Transducer 2 Transducer 3
Setting Value
Remark
1.73 0.15 sec 0.20 A
Not relevant Not relevant
10V 10V with filter
Not relevant Not relevant Not relevant
Settings for Power system data 2 – address blocks 11
Address 1108
Parameter Measurement of Active Power for
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Setting Value
Remark
Generator
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2-4)
Settings for Unbalance load Protection(46G) – address blocks 17
a. Setting continuously permissible current calculation - Setting criterion : Pickup value shall be set at I2 = 8% and K = 10, because generator is cylindrical-rotor generator.
I2
I 2 max mach I Nmach 17,884.7 8 6.81[%] I N mach I N CT prim 21,000
∴ Continuously Permissible current setting is 6.8 [%] b. Setting warning stage time delay(Alarm) - Setting criterion : Setting value shall be set at 3sec for Alarm ∴Warning stage time delay is 3 [sec] c. Setting negative sequence factor K calculation - Setting criterion : Setting value K shall be set at 8, Considering 20% margin .
Ksec K prim (
I Nmach
17884.7 2 )2 8 ( ) 5.80[s] I N CT prim 21,000
∴Negative sequence factor K setting is5.8 [s] d. Setting time for cooling down calculation - Setting criterion :‘
t Cool downc ' value shall be set at according to the manufacturer's
recommended formula.
t Cool downc
K prim (I 2 perm /I N )
2
10 1,562 [s] 0.082
∴Time for cooling down is 1,562 [s] e. Setting 46-2 pickup calculation - Setting criterion : Pickup value shall be set at 60% of rated current for operating for line-to-line short-circuit fault.
I2
I 2 max mach I N mach 17,884.7 60% 51.10[%] I N mach I N CT prim 21,000
∴Continuously Permissible current setting is 51 [%] f. Setting 46-2 time delay -Setting value shall be set at 3sec. ∴46-2 time delay setting is 3.00 [sec]
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g. Setting Table Address 1701 1702 1703 1704 1705 1706 1707 2-5)
Parameter 46 Negative Sequence Protection 46 Continuously Permissible Current 12 46 Warning Stage Time Delay 46 Permissible Negative Sequence Time K 46 Time for Cooling Down 46-2 Pickup 46-2 Time Delay
Setting Value
Remark
ON 6.8 % 3.00 sec 5.8sec 1,562 sec 51% 3.00 sec
Settings for Differential Protection (87G-1,2) – address blocks 20
a. Setting I-Diff> calculation - Setting criterion Setting value shall be set at a range that does not operation by the differential current with CT error and relay error. CT error : The current of minimum operating current side is very small, so ct error is ignore. Relay’s error : Errors guaranteed by Publisher 5%(Reference by SIEMENS 7UM62 Manual) Margin : 5% Relay’s error + margin = 5.0% + 5.0% = 10.0 [%] ∴87-1pick-up setting is 0.1ⅹI/InO b. Setting I-DIFF> time - Setting criterion : Correct setting of the minimum possible. ∴87-1 time delay is 0.00 [sec] c. Setting I-DIFF>> calculation - Setting criterion :Setting value shall be set at greater than 1/X’d(Transient reactance) of generator.
87 - 2
1 0.13 5.777 ⅹI/InO 0.225
∴87-2pick-up setting is 5.8ⅹI/InO
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d. Setting table Address 2001 2005 2021 2026A 2031 2036A 2041A 2042A 2043A 2044A 2051A 2052A 2053 2061A 2062A 2063A
2-6)
Parameter - Group General 87G/87T Differential Protection 87 Increase of Trip Char. During Start - Group I-Diff 87-1 Pickup Value of Differential Curr 87-1 T I-DIFF> Time Delay 87-2 Pickup Value of High Set Trip 87-2 T I-DIFF>> Time Delay - Group Characteristic 87 Slope 1 of Tripping Characteristic 87 Slope 1 of Tripping Characteristic 87 Slope 2 of Tripping Characteristic 87 Base Point for Slope 2 of Charac. 87 I-RESTRAINT for Start Detection 87 Factor for Increasing of Char. At Start 87 Maximum Permissible Starting Time 87 Pickup for Add-on Stabilization 87 Duration of Add-on Stabilization 87 Time for Cross-blocking Add-on Stabiliz.
Setting Value
Remark
ON OFF 0.10I/InO 0.00sec 5.8I/InO 0.00sec 0.25 0.00I/InO 0.50 2.50 I/InO 0.10I/InO 1.0 5.0sec 4.00I/InO 15Cycle 15 Cycle
Settings for Underexcitation (Loss-of-Field) Protection (40) – address blocks 30
a. Setting 1/xd CHAR.1 pickup calculation - Setting criterion :Setting value shall be set at 105% of 1/xd. Char.1
1/ X d
1 17,884.7 1.05 0.43[ P.U ] 2.10 21,000
∴ Susceptance Intersect characteristic 1 is 0.43 b. Setting Angle 1 - Setting criterion :Setting angle shall be set at 60~80°. ∴ Inclination angle of characteristic 1 is 80 [°] c. Setting CHAR.1 time delay - Setting criterion :Setting time shall be set at 2~10 sec. ∴ Characteristic 1 time delay is 5.00 [sec]
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d. Setting 1/xd CHAR.2 pickup calculation - Setting criterion :Setting value shall be set at 90% of CHAR.1. Char. 2 = Char.1 0.9 0.43 0.9 0.387 [ P.U ] ∴ Susceptance Intersect characteristic 2 is 0.39[P.U] e. Setting Angle 2 - Setting criterion :Setting angle shall be set at 90°. ∴ Inclination angle of characteristic 2 is 90 [°] f. Setting CHAR.2 time delay - Setting criterion :Setting time shall be set at 2~10 sec. ∴ Characteristic 2 time delay is 5.0 [sec] g. Setting 1/xd CHAR.3 pickup calculation - Setting criterion :According to manufacturer recommendations, Setting value shall be set at greater than 1.0[[P.U] and smaller than 1/X’d(Transient reactance) of generator.
1 1 17,884.7 A 21,000 V 3.79 [ P.U ] X 'd sec 0.225 21,000 V 21,000 A ∴ Susceptance Intersect characteristic 3is 3.79[P.U] h. Setting Angle 3 - Setting criterion :Setting angle shall be set at 80~110°. ∴Inclination angle of characteristic 3 is 110 [°] i. Setting CHAR.3 time delay - Setting criterion :Setting time shall be set at manufacturer recommendations. ∴Characteristic 3 time delay is 0.50 [sec] j. Setting table Address 3001 3011 3012 3013 3014A 3002 3003 3004 3005 3006 3007 3008 3009 3010
Parameter - Group 40 Underexcit. 40 Underexcitation Protection 40 T-Short Time Delay (Char.&Uexc) 40 State of Excitation Volt. Supervision Excitation Voltage Superv. Pickup Undervoltage blocking pickup - Group Characteristics 40 Susceptance Intersect Characteristic 1 40 Inclination Angle of Characteristic 1 40 Characteristic 1 Time Delay 40 Susceptance Intersect Characteristic 2 40 Inclination Angle of Characteristic 2 40 Characteristic 2 Time Delay 40 Susceptance Intersect Characteristic 3 40 Inclination Angle of Characteristic 3 40 Characteristic 3 Time Delay
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Setting Value ON oo sec OFF 2.00 V 25.00 V
Remark
Not relevant Not relevant Not relevant
0.43 80.0 ° 5.00 sec 0.39 90.0 ° 5.0 sec 3.79 110.0 ° 0.50 sec 12 of 22
2-7)
Settings for Reverse power Protection (32-1G) – address blocks 31
a. Setting P> Reverse Pick-up calculation (After obtain data, the recalculation is needed.) - Setting criterion: Setting value shall be set at less than 50% of the Motoring Power that required for the synchronous speed.
Psec U I 21.0 17884.7 0.5% N mach N mach 0.5% 0.425[%] SN SEC U N pri I N pri 21.0 21,000 ∴32R P> Reverse pick-up setting is -0.42 [%] b. Setting time delay - Setting criterion: Setting time shall be set at 10 sec. ∴32R Trip delay long is 10.00 [sec] c. Setting table Address 3101 3102 3103 3104 3105A
Parameter 32R Reverse power protection 32R P>Pickup 32R Time delay long(without stop valve) 32R Time delay short(with stop valve) 32R Pickup holding time
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Setting Value ON -0.42% 10.00 sec oo sec 0.00 sec
Remark
Not active
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2-8)
Settings for Impedance Protection (21) – address blocks 33
a. Setting fault detection I> pickup calculation - Setting criterion :Setting value shall be set at 125% of the rated current of generator.
I 17,884.7 1.25
5 5.32 [ A] 21,000
∴ Fault detection I>is 5.32[A] b. Setting undervoltage seal-in pickup calculation - Setting criterion: Setting value shall be set at 80% of the rated voltage of generator.
V 110 0.8 88.0 [V ] ∴ Undervoltage seal-in pickup is 88.0 [V] c. Setting duration of undervoltage seal-in - Setting criterion: Setting time shall be set at 4.0 sec. (Z2 operating time + 1.5sec) ∴Duration of undervoltage seal-in is 4.00 [sec] d. Setting impedance zone Z1 calculation - Setting criterion: Setting value shall be set at 75% of step-up Tr. impedance.
ZPRI
kR uk kV 2 75 13 212 0.060 [] 100 100 MVA 100 100 720
KR : Zone reach of zone Z1 in % Uk : percent impedance voltage of the unit transformer
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ZSEC ZPRI
CT Ratio 4,200 0.060 1.32 [] VT Ratio 190.90
∴ Impedance zone Z1 is 1.32 [Ω] e. Setting impedance zone Z1 time delay - Setting criterion: Setting time shall be set at 0.5 sec for back up protection of step up Tr. ∴Impedance zone Z1 time delay is 0.50 [sec] f. Setting impedance zone Z2 calculation - Setting criterion: 1) Setting value shall be set at 150% of impedance for rated power of generator. 2) Step-up Tr. Impedance + (Next transmission line impedance Apparent Factor) 3) Set as a small value of 1) and 2), but Step-up Tr. Data is not received. So setting value is1).
Z PRI
kV 2 212 1.5 1.5 1.02[] MVA 650.52
∴ Impedance zone Z2 is 1.02 [Ω]
g. Setting impedance zone Z2 time delay - Setting criterion: Setting time shall be set at 0.5 sec for back up protection of step up Tr.. ∴ Impedance zone Z2 time delay is 2.50 [sec] h. Setting table Address 3301 3302 3303 3304 3305 3312 3306 3307 3308 3309 3310 3311 3313 3314 3315 3316A 3317A
Parameter - Group General 21 Impedance Protection 21 Fault Detection I> Pickup 21 State of Undervoltage Seal-in 21 Undervoltage Seal-in Pickup 21 Duration of Undervoltage Seal-in 21 T END: Final Time Delay - Group Zones 21 Impedance Zone Z1 21 Impedance Zone Z1 Time Delay 21 Impedance Zone Z1B 21 Impedance Zone Z1B Time Delay 21 Impedance Zone Z2 21 Impedance Zone Z2 Time Delay - Group Power swing Power Swing Blocking Distance betw. Power Swing – Trip-Pol. Rate of Change of dZ/dt Power Swing Blocking locks out Power Swing Action Time
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Setting Value ON 5.32 A ON 88.0 V 4.00 sec oo sec 1.32 Ohm 0.50 sec 0.99 Ohm oo sec 1.02 Ohm 2.50 sec
Remark
Not active
Not active
OFF 1.60 Ohm 60.0 Ohm/s Zone Z1 3.00 sec
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2-9)
Settings for Overvoltage Protection (59G) – address blocks 41
a. Setting V> Pick-up calculation - Setting criterion: Setting value shall be set at 120% of the rated voltage of generator.
V 21,000
110 1.20 132.0[V ] 21,000
∴V> pick-up setting is 132[V] b. Setting V> time delay - Setting criterion: Setting operating time shall be set coordination with operating time of 24G function. ∴V> Time delay is 1.80 [sec] c. Setting table Address 4101 4102 4103 4104 4105 4106A 4107A
Parameter 59 Overvoltage Protection 59-1 Pickup 59-1 Time Delay 59-2 Pickup 59-2 Pickup 59 V>, V>> Drop out ratio 59 Measurement values
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Setting Value ON 132V 1.80 sec 140.0 V oo sec 0.95 Voltage protection with V-PhasePhase
Remark
Not active
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2-10) Settings frequency Protection (81G) – address blocks 42(Requires consultation with the Client) a. Setting 81-1 Pick-up calculation - Setting criterion: Setting value shall be set at 49Hz of under frequency function. ∴81-1 pick-up setting is 49.00 [Hz] b. Setting 81-1 time delay - Setting criterion: Setting operating time delay shall be set at 1.0sec. ∴81-1 time delay is 1.00 [sec] c. Setting 81-2 Pick-up calculation - Setting criterion: Setting value shall be set at 48Hz of under frequency function. ∴81-2 pick-up setting is 48.00 [Hz] d. Setting 81-2 time delay - Setting criterion: Setting operating time delay shall be set at 20sec. ∴81-2 time delay is 20.00 [sec] e. Setting 81-3 Pick-up calculation - Setting criterion: Setting value shall be set at 47Hz of under frequency function. ∴81-3 pick-up setting is 47.00 [Hz] f. Setting 81-3 time delay - Setting criterion: Setting operating time delay shall be set at 1.0sec. ∴81-3 time delay is 1.00 [sec] g. Setting 81-4 Pick-up calculation - Setting criterion: Setting value shall be set at 53Hz of over frequency function. ∴81-4 pick-up setting is 53.00 [Hz] h. Setting 81-4 time delay - Setting criterion: Setting operating time delay shall be set at 1.0sec. ∴81-4 time delay is 1.00 [sec] i. Setting minimum required voltage calculation - Setting criterion: Setting value shall be set at 65% of the rated voltage for operating minimum voltage to frequency protection function.
Vmin 21,000
110 0.65 71.5[V] 21,000
∴ Minimum required voltage is 71.5 [V]
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j. Setting table Address
Parameter
4201 4203 4204 4206 4207 4209 4210 4212 4213 4214
81Over/Under frequency protection 81-1 Pickup 81-1 Time delay 81-2 Pickup 81-2 Time delay 81-3 Pickup 81-3 Time delay 81-4 Pickup 81-4 Pickup Time delay 81 Handling of Threshold stage f4
4215
81 Minimum required voltage for operation
Setting Value
Remark
ON 49.00 Hz 1.00 sec 48.00 Hz 20.00 sec 47.00 Hz 1.00 sec 53.00 Hz 1.00 sec Freq.prot.stage automatic 71.5 V
Alarm
2-11) Settings for Over excitation(volt/hertz) Protection (24G) – address blocks 43 a. Setting 24-1 V/f Pick-up calculation - Setting criterion: Setting value shall be set at 108% of the rated voltage/hertz for minimum operating . ∴24-1 V/f pick-up setting is 1.08 b. Setting 24-1 V/f time delay - Setting criterion: Setting time shall be set at 10secforoperating time in warm stage. ∴24-1 V/f time delay is 10.00 [sec] c. Setting 24-2 V/f Pick-up calculation - Setting criterion: Setting value shall be set at 118% of the rated voltage/hertz. ∴24-2 V/f pick-up setting is 1.18 d. Setting 24-2 V/f time delay - Setting criterion: Setting time shall be set at 2.0sec. ∴24-2 V/f time delay is 2.00 [sec] e. Setting V/f time characteristic - Setting criterion: Setting value shall be set by reference to the short-time over-excitation curve of manufacturer. ∴24 V/f=1.15Time delay is 82[sec] 24 V/f=1.20Time delay is 36 [sec] 24 V/f=1.25Time delay is 26 [sec] 24 V/f=1.30Time delay is 18 [sec] 24 V/f=1.35Time delay is 5 [sec] 24 V/f=1.40Time delay is 5 [sec]
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f. Setting table Address 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314
Parameter - Group Over excitation 24 Over excitation protection(U/F) 24-1 V/f> Pickup 24-1 V/f Time delay 24-2 V/f Pickup 24-2 V/f Time delay - Group Characteristics 24 V/f = 1.05 Time delay 24 V/f = 1.10 Time delay 24 V/f = 1.15 Time delay 24 V/f = 1.20 Time delay 24 V/f = 1.25 Time delay 24 V/f = 1.30 Time delay 24 V/f = 1.35 Time delay 24 V/f = 1.40 Time delay 24 Time for cooling down
Setting Value
Remark
ON 1.08 10.00 sec 1.18 2.00 sec 20000 6000 82 sec 36sec 26sec 18sec 5 5 3600
sec sec
sec sec sec
2-12) Settings for Ground fault Protection (27/59TN) – address blocks 60 "Address. 6006-6009 " function must be reset to the final correction for elements measured during the field test. Address 5201 5202 5204 5205 5206
Parameter 27/59TN Ground Fault Prot. 3rd Harm. 27TN 3rdHamonic Pickup < 27/59TN 3rd H Release Threshould 27/59TN 3.H Release Threshold Pmin> 27/59TN 3.H Release Threshold V 1min >
Setting Value
Remark
ON 1.0V 2.0sec 20% 80V
2-13) Settings for Breaker failure Protection (50BF) – address blocks 70 a. Setting supervision current pickup calculation - Setting criterion: Setting value shall be set at 10% of the rated current of generator.
50BF Pickup 0.1 17884.7
5 0.425 [ A] 21,000
∴Supervision current pickup setting is 0.43 [A] b. Setting trip-timer - Setting criterion: GCB operating time + Lock out relay reset time + margin ∴Trip-timer is 0.15 [sec]
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c. Setting table Address
Parameter
7001 7002
50BF Breaker Failure Protection 50BF Start with Internal TRIP command
7003 7004
50BF Supervision Current Pickup 50BF TRIP-Timer
Setting Value
Remark
ON Start Breaker Failure with Bin.Outp.12 0.43 A 0.15 sec
2-14) Settings for Measurement Supervision – address blocks 81 Address 8101 8102 8103 8104 8105 8104 8105 8108 8109 8110 8111 8112 8113
Parameter Measurement Supervision Voltage Threshold for Balance Monitoring Balance Factor for Voltage Monitor Current Balance Monitor Side 1 Balance Factor for Current Monitor S1 Current Balance Monitor Side 2 Balance Factor for Current Monitor S2 Summation Thes. forVolt. Monitoring Factor for Volt. Sum. Monitoring Summated Cur. Mon. Threshold Side1 Summated Current Mon. Factor Side 1 Summated Cur. Mon. Threshold Side 2 Summated Current Mon. Factor Side 2
Setting Value
Remark
OFF 50 V 0.75 2.50 A 0.50 2.50 A 0.50 10 V 0.75 0.50 A 0.10 0.50 A 0.10
2-15) Settings for Ground Fault Prot. 59GN – address blocks 50 a. Setting Stator Ground Fault Prot pickup calculation - Setting criterion: Setting value shall be set at 8% of maximum zero Phase voltage, because 59GN is detection 90% or more of the generator ground fault.
Voper 240 0.08 19.2 [V ] ∴ Ground Fault Prot pickup current pickup setting is 19.2 [V]
b. Setting trip-timer - Setting criterion: Setting time shall be set at 1.5sec. ∴ Trip-timer is 1.5 [sec]
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c. Setting table Address 5001 5002 5005
Parameter 59G/67GN Stator Ground Fault Prot. 59N V0 Pickup 59N/67GN Time delay
Setting Value
Remark
ON 9.6V 1.5sec
2-16) Settings for Thermal Overload Protection (49M) – address blocks 16 a. Setting K-Factor calculation - Setting criterion :Setting value shall be set at 105% of the rated current of motor.
K 1.05
17884.7 0.8942 21,000
∴ 49 K-Factor is 0.89
b. Setting Time constant - Setting criterion: protection coordination with Stator overload curve. 1) Setting value shall be set at 115% of the rated current and operating time is 89sec.
t I 2 ( ) k IN
ln[
I k IN
2
ln[
]
1
89 17,884.7 1.15 2 ( ) 0.93 21,000
38.5 [SEC]
] 2 17,884.7 1.15 1 0.93 21,000
2) Setting value shall be set at 125% of the rated current and operating time is 54sec.
t I 2 ( ) k IN
ln[
I k IN
2
]
1
ln[
54 17,884.7 1.25 2 ( ) 0.93 21,000
37.5 [SEC]
] 2 17 , 884 . 7 1 . 25 1 0.93 21,000
3)Set as a small value of 1) and 2).So setting value is1). ∴ Time constant is 37.5 sec
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c. Setting 49 thermal alarm stage - Setting criterion: Setting value shall be set at 125% of the rated current and operating time is 54sec.
(
1 1 2 )2 ( ) 0.9070 90.70% k Factor 1.05
∴ 49 Thermal alarm stage is 90% d. Setting Maximum Current for Thermal calculation - Setting criterion :Setting value shall be set at 3 times of the rated current of generator by reference to the recommendation value of relay manufacturer.
I MAX THERM. 17,884.7 3.0
5 12.77 [A] 21,000
∴ 49 K-Factor is 12.77 [A]
e. Setting table Address 1601 1602 1603 1604 1610A 1612A 1615A 1616A 1605 1607 1608
Parameter - Group 49 49 Thermal overload protection 49 K-Factor 49 Time Constant 49 Thermal Alarm Stage 49 Current Overload Alarm Setpoint 49 Kt-FACTOR when motor stops 49 Maximum Current for Thermal Replica 49 Emergency time - Group Temp. Input 49 Temperature Rise at Rated Sec. Curr. 49 Temperature Input 49 Temperature for Scaling
Setting Value
Remark
ON 0.89 37.5 sec 90 % 5.00 A 1.0 12.77 A 100 sec 100 ℃ Disabled 100 ℃
Not relevant Not relevant
2-17) Settings for Supervision Functions(60G)– address blocks 81 Address 8001
Parameter Fuse Fail Mon
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Setting Value ON
Remark Fuse Failure Monitor
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