Electrical Safety Through Design. Mersen EP formerly Ferraz Shawmut

Transcription

1 Electrical Safety Through Design Mersen EP formerly Ferraz Shawmut

2 Agenda Who is Mersen? Selective Coordination Code Requirements Coordination Made Easy Mitigating Arc Flash Energy on Transformer Secondary 9F60HMH Series Approach Controllable Fuse Approach Surge Protection Traditional Protection TPMOV Technology Fusible Shunt Trip Panel 2

3 Company History Thomas Edison issued first safety wire fuse patent Shawmut Fuse Wire Company formed in Boston, MA 1887 Research begins - How to encase wires safely. (Class H) 3

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5 What is Selective Coordination? Not This 5

6 What is Selective Coordination? Selective Coordination Localization of an overcurrent condition to restrict outages, over the full range of available overcurrents Reduce downtime Prevent outages to critical circuits Improve safety 6

7 What is Selective Coordination? But This 7

8 Why is it need? Good Engineering Practice Reduce the blackouts to critical operations Reduce cost of maintenance Critical power applications require it per the National Electrical Code (NEC) Article Article Article Article

9 Critical Power per NEC 2014 Article 517 Health Care Facilities The Essential Electrical System (essential for life) requirements apply to clinics, medical and dental offices, nursing homes, hospitals, etc The Life safety branch of the Essential Electrical System shall meet the requirements of Article 700 except as amended by article 517 *NEW* (G) Overcurrent protective devices serving the essential electrical system shall be coordinated for the period of time that a fault s duration extends beyond 0.1 seconds 9

10 Critical Power per NEC 2014 Article 700 Emergency Systems Emergency Systems. Systems legally required and classed as emergency by municipal, state, federal, or other codes, or by any governmental agency having jurisdiction. These systems are intended to automatically supply illumination, power, or both, to designated areas and equipment in the event of failure of the normal supply or in the event of accident to elements of a system intended to supply, distribute, and control power and illumination essential for safety to human life. 10

11 Critical Power per NEC 2014 Article 700 Emergency Systems Selective Coordination. Emergency systems overcurrent devices shall be selectively coordinated with all supply side overcurrent protective devices. New to 2014 Edition Selective coordination shall be selected by a licensed professional engineer or other qualified persons engaged primarily in the design, installation, or maintenance of electrical systems. The selection shall be documented and made available to those authorized to design, install, inspect, maintain, and operate the system. 11

12 Critical Power per NEC 2014 Article 701 Legally Required Standby Systems Definition - FPN: Typically installed to serve loads such as HVAC, communication, sewage disposal, lighting and industrial processes, that, when stopped during any interruption of the normal electrical supply, could create hazards or hamper rescue or fire-fighting operations Selective Coordination Required 12

13 Critical Power per NEC 2014 Article 708 Critical Operations Power Systems Generally installed in vital infrastructure facilities, that, if destroyed or incapacitated, would disrupt national security, the economy, public health or safety. Systems include HVAC, fire alarm, security, communications and signaling Selective Coordination Required 13

14 Introducing MFCP! Innovative branch circuit protection 20, 32 or 42 branch circuits Only 3 branch fuses ATDR30, AJT60, AJT100 Resettable overload protection Circuit Breaker trips on overloads Standard of the shelf Class J and CC fuses Standard 20 wide 14

15 Introducing MFCP! Branch circuit Protection Mechanically Interlocked Circuit Breaker (OL) 15A 1,2,3 pole 20A 1,2,3 pole 25A 1,2,3 pole 30A 1,2,3 pole 35A 1,2,3 pole 40A 1,2,3 pole 45A 1,2,3 pole 50A 1,2,3 pole 60A 1,2,3 pole 70A 2,3 pole 80A 2,3 pole 90A 2,3 pole 100A 2,3 pole Insulated Busbar Ultra-Safe Fuseholders (SC) 15A 30A -> ATDR30 35A 60A -> AJT60 70A 100A -> AJT100 15

16 T-C Curves

17 T-C Curves

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19 Selective Coordination Panel Selective Coordination Made Easy Easy to coordinate using fuse ratios 2:1 ratio with Amp-Trap 2000 fuses 19

20 Selective Coordination Made Easy 2:1 Ratio With Amp-Trap 2000 A4BQ1000 AJT200 AJT100 AJT350 A6D500R MFCP ATDR30 ATDR30 AJT60 AJT100 20

21 Introducing MFCP! 120/208V, 120/240V, 277/480V or 347/600V MLO, Non-fused switch with or without fuses 20, 32 or 42 branch circuits 250A or 400A Surface or flush-mount enclosures Feed-thru lugs Surge Protection 21

22 Arc-Flash Hazard The only protection between the load-side of the transformer and the line-sides of the main breakers is the MV fuse or CB on the line-side of the transformer. 22

23 Typical Substation Application Paper Mill (~ 30 : 1) 23

24 9F62DDD100 Arc Fault Clearing Time ~ 10 sec

25 Better Time Current Curves for Arc Faults 9F62DDD100 Arc Fault Clearing Time ~ 10 sec F60HMH100 Arc Fault Clearing Time ~ 300 ms

26 Solution: Mersen s Medium Voltage Controllable Fuse System Reduces AF hazard to PPE level 2 or less Fits into existing fuse cabinets Accepts inputs from standard protective relays Provides normal primary shortcircuit and overload protection Costs a fraction of existing mitigation gear 26

27 Mersen s Medium Voltage Controllable Fuse System Consists of 4 different part numbers: A155CNF100 Fuse 15.5 kv, 100A, 3 per system CFAM-100 Actuator Module Mounts to bottom of each of 3 fuses CFIM-100 Interface Module Sends trip signal to CFAM BATTCP1225 Battery One for each CFAM A155CNF100 CFIM100 CFAM100 BATTCP

28 How does the MVCF work? 1. The AF detection system sends a trip signal via the relay to the CFIM Interface Module. Both are located in the LV cabinet. 2. The CFIM immediately sends a fiber optic trip signal to the CFAM Actuator Module attached to the fuse in the MV cabinet. 3. The CFAM emits a pulse that releases a switch mechanism inside the fuse, disconnecting the direct path from the main fuse element. 4. The current is shunted to a small fuse element that opens in a controlled manner. 28

29 Solution: Mersen s Medium Voltage Controllable Fuse System Features and Benefits Fuses fit into existing space, with standard clips The only retrofitting that may be needed is bolting in and/or repositioning new clips

30 The MVCF Reacts to Trigger Signal Sensing is done by others: Light sensors react to the flash, and/or current transformers react to either absolute current flow or the differential Both sending their signals to a relay mounted in the LV panel Basler 851 SEL 751A Eaton DigiTrip and others 30

31 How does the MVCF work? Main Fuse Element Fuse A155CNF100 Relay Input From AF Sensors Made by Others Controlled Fuse Element Single-use Normally Closed Switch Interface Module CFIM100 Actuator Module CFAM100 Fiber Optic Cable 31

32 Controllable Fuse Approach Commutated Fuse Protection System 32

33 How does the MVCF work? 33

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35 Why Surge Protection? Utility Switching 35

36 SPD Operation Load 1 Load 2 Load 3 MOV/SPD tries to: 1.) Send surge away (to ground) 2.) Acts as a momentary short circuit short circuit voltage equalization no overvoltage protected load 36

37 Traditional MOV Technology 37

38 How to Protect: TPMOV Technology Thermally Protected Metal Oxide Varistor by Patented Technology by Mersen The first MOV technology to pass UL th Edition 38

39 TPMOV Technology Fail Safe Surge Products 39

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47 Fusible Shunt Trip Disconnect Switches Elevator Switches ASME/ANSI A Safety Code for Elevators and Escalators calls for remote, automatic disconnection of the main line power prior to the application of water in elevator and/or other sprinkler system applications 47

48 Elevator Switches Specifics A fusible switch (30,60,100,200,400A) used with AJT fuses (fuses ordered separately). Switch is equipped with a tripping mechanism operated by energizing a coil (solenoid device), called a shunt trip. There is a control system for tripping coordinated with fire safety interface. Switch and system are in an enclosure, and are mounted in or near the elevator machinery room. 48

49 Elevator Switch Construction control transformer and fuse protection Grounding lug Neutral lug pilot light key to test switch shunt-trip switch Auxiliary contacts door interlocking handle class J fuses (purchased separately) and block door interlock NEMA1 enclosure wiring diagram terminal blocks relays 49

50 Simple Ordering 50

51 Thank You. Any Questions? Amp-Trap