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Presentation on theme: "Advanced Fuse-Saving Techniques"— Presentation transcript:
Slide1
Advanced Fuse-Saving Techniques
Tamer Rousan
October 12, 2015
Slide2
Ameren Corporation
Serving
2.4 million electric and 933,000 gas customers over 64,000 square miles in Illinois and
Missouri
Generating 10,300 MW regulated electric generation capacity in MissouriMaintaining 7,400 circuit miles of electric transmissionEmploying more than 8500 personnelAverage annual economic impact of $8.6 billion
2
Slide3
Ameren Illinois
Serving
approximately 1.2 million electric and 827,000 gas customers
.
Service territory of approximately 40,000 square miles in central and southern Illinois.4,500 miles of electric transmission lines45,700 miles of electric distribution lines1,035 distribution substations.2,688 distribution circuits. 3
Slide4
Ameren Illinois
4
Ameren’s Protection and Coordination Settings Philosophies
Slide5
Ameren’s Protection and Coordination Settings Philosophies
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Ameren Illinois’ philosophy is to fundamentally use the fault interrupter as a feeder mid-point protection device for fault isolation, coupled with a fault interrupter at a tie point to allow for quick and automatic system restoration
Slide6
Ameren’s Protection and Coordination Settings Philosophies
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Ameren Illinois Distribution Automation (DA) engineering group has standardized its protection and coordination settings philosophy for the mid-tie-mid
application.
To maintain the coordination of series devices that have the same protection settings, an advanced feature called the
PulseFinding
™ Fault Location Technique is
enabled.
We also elected to use Intelligent Fuse Savings on the fault
interrupters.
Slide7
Ameren’s Protection and Coordination Settings Philosophies
7
Intelligent Fuse Savings automatically determines whether a fuse-saving “fast” trip should be used based on the fault-current magnitude.
At
high fault currents, a mechanical device cannot trip faster than a fuse will operate, so Intelligent Fuse Savings will avoid using the fast trip, thereby reducing momentary outages.
Ameren
engineering recommends enabling Intelligent Fuse Savings using a fuse-savings curve that matches the largest fuse size desirable to save downstream of the mid-point fault interrupter.
Choosing
the largest fuse to save should be based on the fuse size used most downstream of the fault interrupter and that serves the largest number of customers.
Slide8
Ameren’s Protection and Coordination Settings Philosophies
8
Slide9
Ameren Illinois
9
Ameren Illinois’
IntelliRupter
Fault Interrupter Protection and Coordination Settings Program.
Slide10
Ameren Illinois’ IntelliRupter Fault Interrupter Protection and Coordination Settings Program
10
To drive consistency, DA engineering built a program that takes in data similar to the
information in the previous tables,
and the group automatically runs through the rules of calculating CTI. It then selects the standard recloser emulation, the optimal PulseFinding setting, and the Intelligent Fuse Savings curve. The program runs the above tasks for coordination in both directions
, draws a circuit diagram with the settings printed on it, and plots the TCC coordination curves
Slide11
Ameren Illinois’ IntelliRupter Fault Interrupter Protection and Coordination Settings Program
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Slide12
Ameren Illinois’ IntelliRupter Fault Interrupter Protection and Coordination Settings Program
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Slide13
Ameren Illinois
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Ameren Illinois’
IntelliRupter
Field Results of Intelligent Fuse Saving.
Slide14
Field Results of Intelligent Fuse Saving
14
Example of a fuse saved on a transient
fault. B163
6/14/2014
~1900 A RMS – Pole 3
PulseClose
lasting ~ 5ms
Service restored after ~ 200ms
Slide15
Field Results of Intelligent Fuse Saving
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Example of a fuse operation for a sustained fault on lateral–B163 9/14/2014
~2000 A RMS – Pole 3
Larger
PulseCloses
in both polarities
Service restored after fuse cleared the fault
A hard close allows fuse to operate
Slide16
Field Results of Intelligent Fuse Saving
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Example of a fuse blown on a transient fault–B176–10/2/2014
~3493 A RMS – Pole 1
Service restored
immediatley
(except for customers downstream of the fuse)
Slide17
Field Results of Intelligent Fuse Saving
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Example of a transient fault on the main line–MV155 8/23/2014.
~3600 A RMS – Pole 1
Fault on mainline, no fuse operation, fault interrupter trips after 217
ms
Slide18
Advanced Fuse-Saving Techniques
18
Conclusions
Ameren Illinois has standardized on the S&C IntelliRupter PulseCloser Fault Interrupter for 12-kV distribution feeder-protection applications. The objective is to simplify the coordination and configuration of the distribution-system devices by using advanced features of the fault interrupter.
The calculator tool created by the DA engineering group simplifies coordination for the typical mid-tie-mid application by automating and optimizing the protection settings. The real-life examples of faults on main lines and laterals demonstrate that single-phase tripping and Intelligent Fuse Savings features are improving customer service reliability. Ameren Illinois will continue to monitor the field events and look for opportunities to improve reliability of electricity service while simplifying and standardizing protection and coordination practices.
