Siemens Arc Flash Procedures PDF 2016

Arc Flash Procedures Siemens Industry Medium Voltage Arc Flash Procedures Release Date March 09, 2016 2016 MS-Arc-Flash-Proc...

Arc Flash Procedures Siemens Industry Medium Voltage Arc Flash Procedures Release Date March 09, 2016 2016 MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 1 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage Siemens Created by: Rodriguez-Melendez, J. Edited by: Borkar, A. Reviewed by: Kao, Y.S. Document Milestone: Issue date: 3/9/2016 Version: 0A Status: In Work / In Review / Released Table of Contents 1 INTRODUCTION................................................................................................................. 5 1.1 Abbreviations used........................................................................................................... 6 1.2 Revision control................................................................................................................ 7 1.3 Reference Documents....................................................................................................... 7 2 What are ARC FLASH SENSORS.......................................................................................... 8 3 What kind of SENSOR ASSEMBLIES.................................................................................... 8 MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 2 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 3.1 Point Sensor...................................................................................................................... 8 3.2 Bare-Fiber Loop Sensor..................................................................................................... 8 4 APPLICATIONS (AE, PE).................................................................................................... 10 5 ROUTING OPTIONS (PE, ED)............................................................................................ 11 6 INSTALLATION GUIDELINES (PE, ED, Factory)................................................................... 11 7 SHIPPING SPLIT (for PE, Factory, Site team)..................................................................... 12 8 TESTING PROCEDURES (Factory, Site team)..................................................................... 13 8.1 Fiber Break Simulation.................................................................................................... 13 8.2 Simulating an Arc Flash................................................................................................... 13 9 NOTE: Precautions with air-interrupting circuit breakers (PE).......................................... 13 10 Annex 1 - ROUTING EXAMPLES........................................................................................ 14 10.1 ABB REA101 Routing example......................................................................................... 14 10.2 SEL-751Routing example................................................................................................. 15 11 Annex 2 - Estimated Lengths based on configuration....................................................... 16 12 Annex 3 - Material Recommendation.............................................................................. 21 12.1 ABB REA.......................................................................................................................... 21 12.2 SEL-751........................................................................................................................... 22 13 Annex 3 – General Notes from PE.................................................................................... 24 MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 3 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 4 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 1 INTRODUCTION Protection relays with arc flash detection combine light-sensing technology with fast overcurrent protection to provide high-speed arc flash detection. Combining these technologies in the same device allows for high-speed tripping during arc flash events without over-tripping for external faults. Reducing the typical overcurrent or instantaneous trip response times allows the relay to improve safety and enhance protection for standard and arc-resistant switchgear in medium and low-voltage applications. This document intent to provide a guide only about the purpose of Arc Flash detection, the fiber requirements and the length required depending on the switchgear. For each project and each section, the factory receives JT files that details each route and also bolts and nuts, and every piece of hardware needed to complete a route. Engineers and Electrical Drafters pick up all relays and cables in the EBOM that is required to complete the system. It is also included here the list of all known material needed at this point for the offering, design and installation of an Arc Flash solution. Finally where applicable the title of each may have some abbreviations in parenthesis that defines the main target group(s). MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 5 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 1.1 Abbreviations used PU Protection Unit CFC Continuous Function Chart DIGSI PC based Relay Programming Tool FDS Functional Design Specification FO Fiber Optic GOOSE Generic Object Oriented Substation Events GPS Global Position System RSTP Rapid Spanning Tree Protocol SCMS Substation Control and Monitoring System SLD Single Line Diagram SNTP Simple Network Time Protocol UPS Uninterruptible Power Supply HMI Human Machine Interface SE Services MLV-SYS Medium Low Voltage – System Group MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 6 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 1.2 Revision control Issue Author Date Comment A Julio Rodriguez 3/9/2016 Fiinal Draft B Review C Review D Add screenshots; review 1.3 Reference Documents Below is a listing of all Reference Documents that will be affected by this document. Item No. Description Status N/A MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 7 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 2 What are ARC FLASH SENSORS Each arc flash sensor is a loop of fiber-optic material that acts as a lens to detect any light emitted in the detection area. Two types of sensors are available: point sensors and bare-fiber loop sensors. Point sensors are lengths of jacketed fiber- optic cable terminating on a small collector lens. This type of sensor is primarily intended to detect light in a specific area. Bare-fiber loop sensors are lengths of unjacketed fiber-optic cables routed in a loop fashion through the detection area. Bare-fiber loop sensors are primarily intended to detect light over a larger, less specific area than point sensors. Both sensor types are very sensitive to light and are made of a rugged, flexible optic material. 3 What kind of SENSOR ASSEMBLIES 3.1 Point Sensor A point sensor assembly consists of a V-pin termination, dual V-pin latch, jacketed-fiber zip-cord duplex, and a point sensor, as shown in Figure 1 below. Figure 1 - Point sensor (SEL example) The dual V-pin latch is designed to hold the V-pin terminators in the correct orientation for direct installation into the arc flash input card. The clips on the latch firmly hold the fiber-optic leads in the sensor terminal block. The jacketed-fiber zip-cord duplex consists of two fiber-optic leads molded together. The maximum total length of the jacketed fiber is 35 meters (114.8 feet). The fiber-optic cable can be cut to the correct length using a sensor termination tool kit (SEL Part Number 915900146). 3.2 Bare-Fiber Loop Sensor The assembly of the bare-fiber loop sensor is similar to that of the point sensor. The maximum total length of the jacketed fiber (A) in this assembly is 30 meters (98.4 feet), and the maximum length of the bare-fiber loop sensor (B) is 50 meters (164 feet). The total maximum length of the fiber in the jacketed-fiber zip-cord and the bare-fiber loop sensor together (A + B + A) must be less than 70 meters (229.6 feet). The reason for combining the jacketed fiber with the bare- fiber loop sensor is to provide isolation between the bare-fiber detection zone and the arc flash input card. MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 8 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage Figure 2 – Bare fiber loop sensor (SEL example) One important thing to note when choosing fiber length is that the longer the bare-fiber loop sensor, the weaker the coupling between the external light and the fiber. This means that if two bare-fiber loop sensors experience the same amount of external light, the light reading in the relay for the longer sensor will be lower than that for the shorter sensor. This is why it is important to keep the fiber length only as long as necessary. The splice bushing allows the transition from jacketed fiber to bare fiber. The bushing is available in either V-pin or ST connectors (see Figure 4). The bushing includes a threaded barrel and lock nuts to facilitate mounting the bushing in the switchgear structure, as shown in Figure 5 and Figure 6. When the section of switchgear monitored by the bare-fiber loop sensor is separated from the relay, the jacketed-fiber zip-cord is used between the relay and the monitored cell. Splice connectors can be used to transition from the zip-cord to the bare-fiber loop sensor, as shown in Figure 3. Figure 3 Transition from Jacketed-Fiber Zip-cord to Bare-Fiber Sensor MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 9 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 4 APPLICATIONS (AE, PE) The following information provides some general ideas for applying arc flash protection in switchgear. These solutions assume “typical” switchgear installations with separate compartments for each breaker, a bus compartment behind each breaker compartment, and separate outgoing cable compartments behind each bus compartment. One solution consists of having a relay on the main breaker with an arc flash input card. From here, install two loops of fiber: Around the bus compartment. Around the main and feeder breaker compartments. There are four arc flash sensor inputs on the arc flash input card, so install two loops in each area (two bus compartment loops and two main/feeder compartment loops) if the length of one loop becomes too long. The current transformers (CTs) from the main breaker connect to the main SEL-751 Relay, and the relay uses that current along with the light from the two to four loops to declare an arc flash condition and trip the main breaker. For this solution, the following occurs: Fault on the main breaker. Light is detected by the loop in the main/feeder breaker compartments. Current is detected by the main CT. An arc flash condition is declared, and the main breaker trips. If the fault is ahead of the main breaker or on the breaker itself, the fault will not clear, and the upstream device must provide backup. For increased speed, it is possible to set up a transfer trip from the main breaker to the upstream breaker in the case of an arc flash event on the main breaker. Fault on the bus. Light is detected by the loop in the bus compartment. Current is detected by the main CT. An arc flash condition is declared, and the main breaker trips. Fault on a feeder breaker. Light is detected by the loop in the main/feeder breaker compartments. Current is detected by the main CT. An arc flash condition is declared, and the main breaker trips. Fault in a cable compartment (feeder faults). Light is not detected because there is no loop in the cable compartment (this assumes that there is a physical barrier between the cable compartment and the other compartments). No arc flash condition is declared. The fault will be cleared by the feeder relay. External fault on a feeder. Current is detected by the main CT, but no light is seen. No arc flash condition is detected. One modification to this solution might be to add a third loop around the cable compartments for feeder faults. With this addition, the main breaker will trip for an arc flash event in that compartment. This addition might not be desired because it results in the entire bus being lost for an event that could have been taken care of by the feeder relay/breaker. Another modification to this solution might be to add point sensors in the cable compartments and use them to trip the individual feeder breakers (along with the CTs coming from the individual breakers). This requires the additional expense of installing arc flash input cards on each of the feeder breakers. A point sensor is run from each feeder relay to its corresponding cable compartment. When an arc flash event occurs in that compartment, the feeder relay trips only that individual feeder breaker. This retains the high speed gained by arc flash protection, and the entire bus is not lost for an arc flash event in a cable compartment. MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 10 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 5 ROUTING OPTIONS (PE, ED) The purpose of adding arc flash detection to the protection system is to improve worker safety and minimize equipment damage. Mounting sensors in the locations most likely to be involved in an arc flash incident improves the likelihood of fast detection and hazard mitigation. Arc flash incidents are common in areas of transition between conductor types. Examples of increased arc flash risk locations are incoming line sections where the transition is from wire to bus, breaker stab points, and bus section transitions. Many times, these major areas are separated by metal barriers per ANSI standards for metal clad switchgear. This isolation reduces damage during a fault by isolating the fault to one area and provides the additional advantage of being able to use light to detect which area the fault is in. As an example, the SEL- 751 Relay has four separate inputs for arc flash detection, where each input can be used to trip a separate section of the switchgear, quickly isolating the fault but also minimizing the affected sections. When selecting the mounting locations for the arc flash sensors, plan routing and mounting decisions with sectional isolation in mind. Giving careful thought to the affected area and the corresponding isolation point can influence the selection of where to mount the sensors as well as how many sensors are needed. A typical installation includes point sensors in the main breaker section and a bare-fiber loop sensor routed throughout the bus section of the switchgear. Each breaker cell includes point sensors in the breaker section and the outgoing connection section. An arc flash event indicated in the outgoing section would trip the circuit breaker feeding that section, while an arc flash event in the circuit breaker section would trip the main breaker for the entire section. Fiber-optic sensors depend on the arc flash light to easily travel through the fiber without excessive loss. Damaging a fiber by bending too tightly, applying too much pull force, or scratching the surface of the bare fiber can make the sensor loop inoperative. Use caution when installing the fiber by maintaining a large bend radius (at least 2 inches / 50 mm) and minimizing contact with sharp edges. It is recommended protection sleeves wherever the fiber-optic cable passes next to sheet metal edges that can damage the cable. Field testing of arc flash failures indicated that sensors installed toward the rear of the breaker cell provided the best results. Sensors mounted toward the front were able to detect arc flash incidents but had a slower detection speed than rear-mounted sensors. The picture below shows the best locations to mount point sensors. Route the bare-fiber loop sensor through the main bus sections of the switchgear. Make a loop out of the route with one branch going high across the switchgear and the return passing below the bus sections. Do not mount the fiber-optic sensor on the bus or across the three phases of the bus. Make sure the bare-fiber loop sensor extends the entire length of the bus for complete coverage. A sensor in this area should trip the switchgear main breaker. It is not recommended to have too much extra fiber on a bare-fiber loop sensor. Fiber that is too long can reduce the light coupling and produce a weak signal. 6 INSTALLATION GUIDELINES (PE, ED, Factory) 1. Fiber-optic cable routing should take advantage of existing control and wiring routes in the switchgear. It is recommended that the bare-fiber sections be placed in position and then secured with ties. Pulling the bare fiber through the ties or wire looms can scratch and gouge the outer wall of the fiber, significantly increasing light loss through the section. 2. Mounting should stay clear of any conductors as well as any pinch points or mechanical interferences. Cable routes should avoid passing over conductors so that a failure of the mounting device or the integrity of the fiber cable does not result in the cable falling on the conductor. Although the fiber-optic sensors are nonmetallic, dust, dirt, or moisture on the sensor can contribute to a fault path. Generally, it is best to install the sensors toward the back of the breaker cell. Some breakers include side shielding that limits the light emission. Mounting the sensor toward the back of the cell optimizes the amount of light received by the sensor. MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 11 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 3. Minimize exposure to moving parts to avoid snagging the fiber. For circuit breaker compartments, the best location is usually near the top and rear of breaker cell and away from the breaker. For bus compartments, the best location is usually along the back wall, centrally located with respect to the busbars. Do not route the fiber- optic sensor over or near the breaker installation rails. As the breaker is installed, the breaker truck moves back into the cell. The weight of the breaker truck can easily damage the sensor. 4. Avoid high temperature surfaces. High temperatures (above 80 °C or 176 °F) can decrease the performance of the fiber over time. Do not secure the fiber directly to the bus. 5. Avoid obstructions that would shield the fiber from the light of an arc flash. The fiber should not be installed in conduit or in raceways that would limit or prevent exposure to the arc flash. However, a protective tubing (inner duct tubing or corrugated tubing) or conduit impervious to light is necessary if sections of the Sensor Fiber have to be routed via areas where light detection is not wanted. 6. Secure the fiber using nylon ratchet clamps or similar “loose” cable management products. (Non-conductive wire ties can also be used, but care must be used to avoid over tightening and breaking fiber.) The purpose of these clamps is simply to keep the fiber away from moving parts and to avoid snagging the fiber when racking breakers in or out of the cell. Self-adhesive attached products are not recommended because they may lose their adhesive properties overtime. 7. Use protective rubber grommets when routing the Sensor Fiber through metal walls. When installing bulk fiber, a very small grommet can be used. For pre-terminated fiber, with a ST connector on each end, a minimum hole size of 10 mm or 3/8 inch diameter is required. 8. Avoid sharp bends. The minimum permanent bending radius of the Sensor Fiber is 50 mm or 2 inches (that’s a 4- inch diameter). (During installation, a temporary bending radius down to 25 mm or 1 inch is acceptable.) The fiber will be damaged or broken if this minimum bending radius is not maintained. When coiling fiber, make a loose coil of the excess fiber and attach it to the compartment wall. Do not pull the fiber tight. 9. Special recommendations for the factory (only): a. Install the Sensor Fiber last (after all other switchgear work is done). This avoids unnecessary exposure to damage during the installation of other wiring. b. Tie fluorescent non-adhesive tape bows along fiber at regular intervals in cable compartments. This will help the commissioning crews see the fiber during field construction. c. Avoid installing where commissioning crews may damage. Since the fiber can be hard to see, even with fluorescent tape, avoid installing fiber where it would be easily damaged during commissioning. For example, this would include on top of a busbar brace (great place for trouble light). 7 SHIPPING SPLIT (for PE, Factory, Site team) When shipping splits are necessary for shipping switchgear, there are two options to consider. The preferred method is to cover each shipping split with its own Sensor Fiber loop. The other option is to use shipping split splice adapters. The splice adapter is a female/female ST fiber optic connector (see photos). It is used to terminate the fiber at each relay unit and also to repair the fiber, if ever necessary, when broken. MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 12 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage The ST connector of the first section of the fiber loop may be terminated at a splice adapter near one end of the switchgear section. The ST connector for the adjacent fiber loop section should be temporarily secured in place with a wire tie during shipment. During final assembly in the field, the two fibers are joined together at the splice adapter. Each time the female/female ST connector is used it counts as a splice. For all practical purposes, it is recommended to only join a maximum of shipping split sections together using 2 such connectors creating an overall fiber loop consisting of 3 sections since the maximum number of splices allowed is 3. Hence the reason for the preferred shipping split option suggested earlier. 8 TESTING PROCEDURES (Factory, Site team) 8.1 Fiber Break Simulation A Sensor Fiber fault may be simulated by disconnecting one end of the Sensor Fiber. The sensor fault indication will appear after some time (supplier dependent), depending on when the last test pulse has been sent. Warning: A broken or disconnected fiber loop does not inhibit the operation of the arc protection system. On the contrary, the connected device will typically see MORE light because the exposed ends of the fiber are far more receptive to light than the normal external cylindrical surface. This could result in an unexpected trip operation if the current supervision has been deactivated or if the supervising current level is simultaneously exceeded. 8.2 Simulating an Arc Flash Typically, for security reasons, the arc protection system is implemented such that both light and current are simultaneously required to trip (Trip Condition key switch set to “Current & Light”). However, if this key switch is set to “Light”, only light is required to trip. (There is no “Current” setting whereby the relay will trip on only current. Light is always required for a trip.) The current level is sensed by the relay via its connected current transformers (CTs). The current supervision acts as a fault detector, supervising the light detection portion of the fiber system. The testing equipment needed includes a current source and a light source. The current source must be capable of delivering sufficient current to exceed the current level settings of the relay. A camera flash unit may be used for the light source with some restrictions: Most modern built-in camera flashes will not activate the sensors because the flashing time is too short and/or not sufficiently intense. The flash must last at least 1 millisecond. Medium-power to high-power camera flash units are required for testing purposes. The camera flash should be directed toward the Sensor Fiber and within about 2 feet. 9 NOTE: Precautions with air-interrupting circuit breakers (PE) For certain feeder breaker designs (such as air breakers), a feeder fault outside of the zone of protection can result in a large amount of current, and when the feeder breaker interrupts the fault, an arc results. This arcing is not indicative of an arc flash event in the breaker compartment, but rather a part of the process for the feeder breaker interrupting the current for the out-of-zone fault. The light resulting from this arc may be large enough to cause the protection elements to pick up. Tripping the entire bus for a situation like this is undesired. For installations like this, signaling is required between the feeder breaker relay and the main breaker relay, so that if a feeder breaker relay calls for a trip, a blocking signal can be sent to the main relay to temporarily disable arc flash tripping on the main breaker relay. MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 13 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 10 Annex 1 - ROUTING EXAMPLES 10.1 ABB REA101 Routing example MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 14 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 10.2 SEL-751Routing example MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 15 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 11 Annex 2 - Estimated Lengths based on configuration MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 16 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 17 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 18 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 19 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 20 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 12 Annex 3 - Material Recommendation 12.1 ABB REA ABB REA system Pos Device Siemens part # Applications Note GM-SG SIMOVAC 1 REA 101 77601000810 One per Main breaker (one sensing loop input in the module) 2 REA 103 77601000811 Can cover 4 sections max. Two Can cover 4 sections max. Maximum 5 sensing loop inputs for each Two sensing loop inputs for REA 103 or module (maximum two sections each module (maximum 105 can be per loop; no single loop is two sections per loop; no chained. allowed to cross shipping split) single loop is allowed to cross shipping split) 3 REA 105 77615000402 One per Tie breaker (one sensing loop input in the module) 4 Arc sensing 77615000836 SIMOVAC Incoming line cables, 5 meter section with relay in same section Arc sensing 77615000837 Transition section Flush-front cables, 10 meter with relay is in adjacent or next to adjacent section Arc sensing 77615000838 Transition section Flush-rear, Single stacked, one-high or cables, 15 meter with relay is in adjacent or next LBS section SIMOVAC with to adjacent section relay in same section or adjacent section Arc sensing 77601000812 Single section GM-SG, breaker cables, 20 meter over breaker or breaker over aux, with relay in same section of adjacent section Arc sensing 77615000839 Single section GM-SG, aux over Two SIMOVAC stacked cables, 25 meter breaker or aux over aux, relay in sections same section or adjacent section Arc sensing 77615000840 Single GM-SG section and Two SIMOVAC One-High cables, 30 meter transition section sections Arc sensing 77601000925 Two sections of any combination cables, 40 meter except 2 - aux over aux in the same loop and goes to relay on the door 5 Communication 77615000486 Connection between two REA- cable between 101, 10 meter is good for Main- Maximum two REA-101; 10 aux-Tie-aux-Main (3 sections in 40 meters meter between) 6 Communication 77601000922 10 meter is good for up to 6 cable between sections in between Maximum REA-101 and REA- 40 meters 103 or 105; 10 meter 7 Lockout relay (86) One set of contacts for each breaker MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 21 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 12.2 SEL-751 SEL 751A system Device Siemens part # Applications Note GM-SG SIMOVAC 1 SEL 751A relay Similar to One per breaker, or one at One at each starter or one Requires high 77620300080 each main if not more than 4 at each main if not more speed output sensing loops required than 4 sensing loops contact, option required CA in one of the I/O card and option 74 at slot E for sensing loop input (4 inputs each relay) example: 751A51ACA0X74 850300 2 Arc sensing 77950300052 SIMOVAC Incoming line cables, 2 meter section with relay in same sensing + 4 meter or adjacent section run-back (black jacket) 3 Arc sensing 77615000902 Transition section Flush-front cables, 4 meter with relay is in adjacent or sensing + 4 meter next to adjacent section run-back Arc sensing 77615000906 Transition section Flush-rear, cables, 8 meter with relay is in adjacent or sensing + 4 meter next to adjacent section run-back Arc sensing 77615000903 Single section stacked, cables, 12 meter one-high or LBS SIMOVAC sensing + 4 meter with relay in same section run-back or adjacent section Arc sensing 77615000904 Single section GM-SG, cables, 15 meter breaker over breaker, with sensing + 4 meter relay in same section of run-back adjacent section Arc sensing 77608000133 Single section GM-SG, cables, 20 meter breaker over aux, aux over sensing + 4 meter breaker or aux over aux, relay run-back in same section or adjacent section MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 22 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage SEL 751A system Device Siemens part # Applications Note GM-SG SIMOVAC Arc sensing 77615000905 Single section GM-SG, aux Two SIMOVAC stacked cables, 22 meter over breaker with flush front sections sensing + 4 meter transition, relay in same run-back section or adjacent section Arc sensing 77615000876 Two SIMOVAC one-high cables, 25 meter or LBS sections sensing + 4 meter run-back Arc sensing 77615000907 Single section GM-SG, aux cables, 27 meter over breaker with flush rear sensing + 4 meter transition, relay in same run-back section or adjacent section, relay in same section or adjacent section Arc sensing 77615000908 Two GM-SG sections stacked cables, 32 meter breakers, relay in same sensing + 4 meter section or adjacent section run-back Arc sensing 77615000908 Two sections of one high, aux Maximum over cables, 40 meter over breaker, relay in same all length 70 sensing + 4 meter section or adjacent section meters (example: run-back this cable is 4+40+4=48 meter which is OK.) 4 Lockout relay (86) One set of contacts for each breaker 5 Communication between relays can use Inputs and outputs MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 23 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.  Arc Flash Procedures Siemens Industry Medium Voltage 13 Annex 3 – General Notes from PE 1) We are not using lens sensors due to the fact that light from arcing source may be blocked by devices or components in a compartment and not reach the sensor. 2) Our philosophy for the arc flash protection is to shut down the entire gear no matter where the arcing is located. Since arcing can migrate to adjacent compartments quickly, opening one or some breakers in a line up does not provide full protection. Hence, we do not endorse SEL's concept of monitoring individual compartment and selectively open associated breaker(s). 3) We need to avoid running a single fiber sensing loop for more than two sections (transition section should be counted as a section). 4) Do not run a single fiber sensing loop across any shipping split. 5) Overcurrent along with light detected usually are the determining factors for an arcing event, so CT's are required for the relay with arc sensing fiber loop input. MS-Arc-Flash-Procedures-0A_2016-03-09-R1.docx Page 24 / 24 3/22/2016 © 2016 by SIEMENS (Medium Voltage) This document shall not be transmitted or reproduced, nor shall its contents be exploited or disclosed to third persons without prior written consent. Infringements shall entitle to damage claims. All rights reserved.