How To Resolve Rising Fault Current Levels On Your Overhead Network

S&C Electric Fault Tamer Fuse Limiter

S&C Electric Fault Tamer

product FEATURES

Fault Tamer provides many features and benefits above those of traditional fuse cutouts and cutouts used in combination with backup current-limiting fuses.

Improved Transformer Protection

Ideally suited for protecting single- or three-phase transformers through
- 100 kVA single-phase at 15 kV
- 167 kVA single-phase at 25 kV
Excellent continuous, hot-load pickup, and cold-load pickup capabilities.
High surge withstand capability. Allows arrester to be mounted on transformer tank without increasing the chance of nuisance operations due to lightning.

Energy Limitation

Minimizes equipment damage
- Reduces chances of catastrophic transformer failure from internal high-current faults.
- Minimizes bushing and tank damage due to external primary faults.
Improves service continuity
- Provides complete coordination with upstream lateral fuses.
- Provides complete coordination with substation instantaneous relay settings.
Enhances power quality
- Minimizes voltage dips that can cause sensitive electronic equipment to shut down.

Operational Characteristics

Dropout action.
No parts expelled during circuit interruption.
Complies with Australian Spark Production Standard AS 1033.1-1990. Ideal for installation in areas prone to grass fires.

Handling Characteristics

Easy to install/remove using extendo stick. No climbing or bucket truck needed to re-fuse . . . unlike conventional backup current-limiting fuses.
Retrofits into all vintages of S&C Type XS Fuse Cutouts.
Operable with Loadbuster^®, S&C’s Portable Loadbreak Tool.

Ratings Data

50/60-Hz Ratings
Voltage, kV						Amperes, RMS
System Class, ANSI (IEC)	System Maximum				BIL	Cont.	Interr., Sym.
	60 Hz		50 Hz
	Three- Phase♠	Phase-to-Neutral	Three- Phase♠	Phase-to-Neutral
15 (12)	15	8.7	15	8.7	110	20	12 000
	15	8.7	15	8.7	125
25 (24)	29	16.8	26	15.1	125
	29	16.8	26	15.1	150
	29	16.8	26	15.1	150
22/38 (20.8/36)	–	22	–	20.8	150
♠ Also applies to phase-to-phase applications. Applications involving single-phase transformers connected phase-to-phase, as well as three-phase applications require the use of a Fault Tamer in each lead.

Operation

On low magnitude faults, just the inexpensive fuse cartridge operates — similar to a conventional fuse cutout. Fault Tamer drops open, providing visual indication that it has operated.

On high-magnitude faults, both the fuse cartridge and the backup limiter operate. The fusible element in the limiter melts in multiple locations, creating myriad series arcs that promote an initial rapid increase in arc voltage. The increased arc voltage efficiently limits current to a small fraction of the prospective peak current. Fault current is driven to zero in a controlled fashion, as the fusible element burns back and arc energy is absorbed by the surrounding sand.

Fault Tamer^® Fuse Limiter | Fault Interruption — How It Works

FAULT TAMER FUSE LIMITERS

TIME-CURRENT CHARACTERISTIC (TCC) CURVES

Curve Type	Ampere Ratings	Fuse Type	TCC Number
15kV to 38kV System Voltages
Minimum Melting	3, 5, 7, 10, 15, 20	Fault Tamer	TCC Number 450-8
Total Clearing			TCC Number 450-8-3
S&C Electric Standard Speed (12kV to 22kV System Voltages)
Minimum Melting	1, 2, 3, 5, 7, 10, 15, 20	Fault Tamer	TCC Number 123-8
Total Clearing			TCC Number 123-8-3

Thorne & Derrick

T&D are Specialist Distributors to UK Distribution Network Operators (DNO’s), NERS Registered Service Providers, ICP’s and HV Jointing Contractors of an extensive range of LV, MV & HV Jointing, Earthing, Substation & Electrical Eqpt – this includes 11kV/33kV/66kV cable joints, terminations and connectors for both DNO and private network applications.

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