This document contains calculations for protection settings for a 7.5MVA transformer connecting a 33kV feeder to an 11kV bus. It provides the base MVA, impedance values, fault levels, and resulting fault currents. It then calculates the operating times for overcurrent and earth fault protection and ensures adequate margins between devices. A table summarizes the selected settings for overcurrent and earth fault protection at different points in the system.
�The sample calculations shown here illustrate steps involved in calculating the relay settings for generator protection.
�Other methodologies and techniques may be applied to calculate relay settings based on specific applications.
Tutorial on Distance and Over Current ProtectionSARAVANAN A
Contents
• Protection Philosophy of ERPC
• Computation of Distance Relay Setting
• System Study to Understand Distance Relay
Behaviour
• DOC and DEF for EHV system
�The sample calculations shown here illustrate steps involved in calculating the relay settings for generator protection.
�Other methodologies and techniques may be applied to calculate relay settings based on specific applications.
Tutorial on Distance and Over Current ProtectionSARAVANAN A
Contents
• Protection Philosophy of ERPC
• Computation of Distance Relay Setting
• System Study to Understand Distance Relay
Behaviour
• DOC and DEF for EHV system
Power System protection and Metering,Types of Faults and effects,Symmetrical faults,Unsymmetrical faults,Fault Statics,Components of power System protection,Relay,Classification of Relay,Induction relay,thermal relay,Static Relay,Numerical Relay
�The sample calculations shown here illustrate steps involved in calculating the relay settings for generator protection.
�Other methodologies and techniques may be applied to calculate relay settings based on specific applications.
The protections of generator are the most complex and elaborate due to the following reasons: Generator is a large machine, connected to bus-bars. It is accompanied by unit transformers, auxiliary transformers and a bus system. ... The protection of generator should be co-ordinate with associated equipment's.
Power System protection and Metering,Types of Faults and effects,Symmetrical faults,Unsymmetrical faults,Fault Statics,Components of power System protection,Relay,Classification of Relay,Induction relay,thermal relay,Static Relay,Numerical Relay
�The sample calculations shown here illustrate steps involved in calculating the relay settings for generator protection.
�Other methodologies and techniques may be applied to calculate relay settings based on specific applications.
The protections of generator are the most complex and elaborate due to the following reasons: Generator is a large machine, connected to bus-bars. It is accompanied by unit transformers, auxiliary transformers and a bus system. ... The protection of generator should be co-ordinate with associated equipment's.
An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries, supercapacitors, or flywheels.
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FOR MORE INFORMATION: http://www.idc-online.com/content/design-industrial-automation-functional-specifications-plcs-dcss-and-scada-systems-15
Cable sizing to withstand short-circuit current - ExampleLeonardo ENERGY
A short circuit causes very extreme stresses in a cable which are proportional to the square of the current:
A temperature rise in the conducting components such as conductor, screen, metal sheath, armour. Indirectly the temperature of adjoining insulation and protective covers also increases,
electro-magnetic forces between the current-carrying components.
The temperature rise is important for its effect on ageing, heat pressure characteristics etc. and should be limited to a permissible short-circuit temperature. The thermo-mechanical effects of the current shall also be considered.
For the given short-circuit condition the short-circuit capacity of a cable should be investigated with respect to all these parameters. For multi-core cables in most instances the thermal effect - related to the magnitude of fault current and clearance time - is the critical parameter, since the cable will normally have enough mechanical strength. With single-core cables however the mechanical effect - related to the magnitude of the peak short-circuit current - is of such significance that, next to the thermal, the mechanical strength of both cable and its supports should be investigated.
Also accessories must be rated with respect to thermal and mechanical short-circuit stresses.
The short circuit strength of a cable system is not quantitatively defined with regard to permissible number of repeated short circuits, degree of deformation or destruction or impairment quality. It is expected, however, that a cable installation will remain safe in operation and that any deformation remains within tolerable limits even after several short circuits.
This course provides practical overview of short circuit performance of a cable.
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Catalog LS, Catalog,
Catalog Thiết Bị Điện LS, Catalog Thiết Bị Điện,
http://dienhathe.com,
Chi tiết các sản phẩm khác của LS tại https://dienhathe.com
Xem thêm các Catalog khác của LS tại https://dienhathe.info
Để nhận báo giá sản phẩm LS vui lòng gọi: 0907.764.966
Catalog ls metasol mc e_1004_denhathe.vnDien Ha The
Khoa Học - Kỹ Thuật & Giải Trí: http://phongvan.org
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Protection settings calculation
1. April
2016
4
Protection Settings
Calculations
PROTECTION SETTINGS CALCULATIONS
Useful information
- Base MVA = 100MVA
- Rating of the TX 2 = 7.5MVA
- Percentage Impedance of the TX 2 at Tap 9 and Tap 17 is 7.70% and 7.47%
respectively
- Fault MVA at Chemosit 33kV bus = 0
62.10426.258 −∠
- Conductor size of the 33kV Kericho feeder and length from Chemosit is 2
75mm
ACSR and 20KM respectively
- Settings for 5L5 at Chemosit (Back up O/C & E/F);
O/C : PSM = 300A, & TMS = 0.3
E/F: PSM = 50A, & TMS = 0.4
Source Impedance`Calculation
0
62.104
26.258
100
)33( ∠=
MVA
MVA
kVZs
.3747.0098.0 puj−−=
Total Z p.u of the 33kV Kericho feeder upto the 33kV bus at Kericho 33/11kV s/s
)0365.00375.0(20)33(2
75
jxkVZ mm
+=
puj 73.075.0 +=
Impedance p.u. of the 7.5MVA TX 2 as expressed to the new MVA base (Tap 17)
= upj .996.0
The resultant Total impedance p.u. upto 11kV bus
)2()33()( 5.77511 2 TXZkVZZbusZ MVAmmskV ++=
= puj 3513.16523.0 +
Resultant fault MVA
= MVA0
23.6464.66 −∠
Fault Current at the 11kV bus
7.5MVA TX 2 – Kericho 33/11kV s/s
Calculations by: afanda rodgers
)3513.16523.0(
100
j
MVA
MVAf
+
=
1005.7
10047.7
)2(5.7
xMVA
MVAx
jTXZ MVA =
2. April
2016
4
Protection Settings
Calculations
A
kVx
MVAx
I f
113
100064.66
=
= A89.3497
Protection relays/equipment operating times calculations on the 11kV fault current of
3497.89A (ph – ph)
1. 5L5 O/C relay
sec
1)
3003
89.3497(
3.014.0
)/( 02.055
−
=
x
x
cot L
=1.5260 sec
2. New 7.5MVA TX 2 HV O/C relay
sec
1)
1503
89.3497(
35.014.0
)/( 02.0
−
=
x
x
cotHV
=1.1704 sec
Operating margin between the two units above is 0.357 sec
3. New 7.5MVA TX 2 LV O/C relay
sec
1)
396
89.3497(
25.014.0
)/( 02.0
−
=
x
cotLV
=0.7860 sec
Operating margin between LV and HV over current is 0.385 sec
4. All 11kV feeder reclosers
sec
1)
300
89.3497(
14.014.0
)/( 02.011
−
=
x
cot recloserskv
7.5MVA TX 2 – Kericho 33/11kV s/s
Calculations by: afanda rodgers
3. April
2016
4
Protection Settings
Calculations
=0.3893 sec
Operating Margin between TX 2 LV O/C and 11kV reclosers is 0.397 sec
Operating times of protection units on 11kV Earthfaults of 1165.96A
1. 5L5 E/F relay
sec
1)
50
6.388(
3.014.0
)/( 02.055
−
=
x
FEt L
=1.3376 sec
2. 7.5MVA TX 2 SBEF relay
sec
1)
80
96.1165(
38.014.0
)/( 02.0
−
=
x
FEtSBEF
= 0.9664 sec
Operating margin between 5L5 and the 7.5MVA TX 2 SBEF is 0.3712 sec
3. TX 2 LV E/F
sec
1)
45
96.1165(
3.014.0
)/( 02.0
−
=
x
FEtTX
=0.6245 sec
Operating margin between the TX 2 SBEF and TX 2 LV E/F is 0.3420 sec
4. 11kV feeder reclosers
7.5MVA TX 2 – Kericho 33/11kV s/s
Calculations by: afanda rodgers