Ultra Fast Earthing Switch UFES retrofit Overview
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1 Gordon van der Linde ABB PTMV - Service Ultra Fast Earthing Switch UFES retrofit Overview May 20, 2013 UFES Slide 1
2 Ultra Fast Earthing Switch UFES retrofit Content 1. Effects of an internal arc 2. The new Ultra Fast Earthing Switch UFES 3. Retrofit solutions with Ultra Fast Earthing Switch UFES 4. Advantages 5. Application examples May 20, 2013 UFES Slide 2
3 Effects of an internal arc fault Reasons for an arc accident Most common reasons for arc flash accidents 1. Human errors 2. Mechanical faults 3. Bad connections 4. Pollution When do arc flash accidents occur 25 % without operator 10 % with operator in front of a closed door 65 % with operator working in the switchgear 5. Animals May 20, 2013 UFES Slide 3
4 Effects of an internal arc fault Internal arc test without active protection device An internal arc fault will lead to extreme impacts for the inside of the switchgear and for the integrated devices. Illustration: Internal arc test - 50kA / 1s Fault initiation in CB compartment May 20, 2013 UFES Slide 4
5 Effects of an internal arc fault Example 1 May 20, 2013 UFES Slide 7
6 Effects of an internal arc fault Example 2 May 20, 2013 UFES Slide 8
7 Ultra Fast Earthing Switch UFES Content 1. Effects of an internal arc 2. The new Ultra Fast Earthing Switch UFES 3. Retrofit solutions wiith Ultra Fast Earthing Switch UFES 4. Advantages 5. Application examples May 20, 2013 UFES Slide 9
8 Effects of an internal arc fault Chain reaction of hazardous impacts Rapid temperature rise (up to C) Rapid pressure rise What happens during an internal arc fault? Release of material fragments and hot gases Burning and vaporization of metal and insulation material Heavy injuries of the personnel possible for switchgear systems without internal arc classification Heavy damages possible inside of the switchgear, for the integrated devices and for the building May 20, 2013 UFES Slide 10
9 Effects of an internal arc fault Pressure curves Exemplary pressure curve, with and without UFES, in a compartment of an air insulated medium voltage switchgear, for an internal arc fault current of 130 ka (peak) / 50 ka (rms) Pressure curve without UFES Pressure curve with UFES Overpressure in bar 4 Time in ms May 20, 2013 UFES Slide 11
10 Ultra Fast Earthing Switch UFES Impacts of the internal arc Conventional protection device Dramatic consequences possible Fire/Explosion hazard, heavy injuries of personnel (depending on switchgear design) Ultra Fast Earthing Switch type UFES No consequences to be expected Prevention of any thermal damage Drastically reduced pressure rise Fast protection relay Limited consequences for equipment and personnel (depending on switchgear design) Steel fire Copper fire Cable fire May 20, 2013 UFES Slide 13
11 Ultra Fast Earthing Switch UFES Event sequence description 1. Formation of an internal arc May 20, 2013 UFES Slide 14
12 Ultra Fast Earthing Switch UFES Event sequence description 1. Formation of an internal arc 2. Detection of the internal arc by light and/or current monitoring May 20, 2013 UFES Slide 15
13 Ultra Fast Earthing Switch UFES Event sequence description 1. Formation of an internal arc 2. Detection of the internal arc by light and/or current monitoring 3. ~ 1-2 ms after detection Tripping of the UFES primary switching elements by the electronic device (optional also tripping of the upstream circuit-breaker) May 20, 2013 UFES Slide 16
14 Ultra Fast Earthing Switch UFES Event sequence description 1. Formation of an internal arc 2. Detection of the internal arc by light and/or current monitoring 3. ~ 1-2 ms after detection Tripping of the UFES primary switching elements by the electronic device (optional also tripping of the upstream circuit-breaker) 4. < 4 ms after detection Creation of a solid, 3-phase short-circuit earthing by the UFES primary switching elements, resulting in the consequent interruption of the arc voltage. The internal arc will extinguish. May 20, 2013 UFES Slide 17
15 Ultra Fast Earthing Switch UFES Event sequence description 1. Formation of an internal arc 2. Detection of the internal arc by light and/or current monitoring 3. ~ 1-2 ms after detection Tripping of the UFES primary switching elements by the electronic device (optional also tripping of the upstream circuit-breaker) 4. < 4 ms after detection Creation of a solid, 3-phase short-circuit earthing by the UFES primary switching elements, resulting in the consequent interruption of the arc voltage. The internal arc will extinguish. 5. After 80 ms + time x Final clearing of the fault current, flowing through the primary switching elements, by the upstream circuit-breaker. May 20, 2013 UFES Slide 18
16 Effects of an internal arc fault The new active protection of ABB UFES - The new Ultra Fast Earthing Switch of ABB A device as small as a 24 kv insulator offers enhanced protection for your switchgear by minimization of all these effects The UFES arc protection system channels the uncontrolled release of energy by the arc into a solid metal, 3-phase connection to earth potential The internal arc will be extinguished within an operation time of < 4 ms after detection of the fault May 20, 2013 UFES Slide 19
17 Ultra Fast Earthing Switch UFES Primary switching element Epoxy insulator Fixed contact Ceramic insulator Vacuum device Drive Membrane Rupture joint Piston Cylinder Moving contact system Micro gas generator May 20, 2013 UFES Slide 20
18 Ultra Fast Earthing Switch UFES Switching principle Position after tripping Service position For animation click into the picture Moving direction Current flow after tripping Vacuum device Drive May 20, 2013 UFES Slide 21
19 Ultra Fast Earthing Switch UFES Electronic Electronic device for measurement, logic and tripping, type QRU1 9 optical inputs for light detection 3 current inputs Extendable up to 150 supplementary optical inputs with light detection system TVOC-2 Exact identification of fault location Watchdog function Test mode for complete functionality check for installed condition Simple configuration May 20, 2013 UFES Slide 22
20 Retrofit solutions with UFES Additional system components for UFES retrofit Arc Guard System - TVOC-2 Reliability Flexibility Simplicity Polar diagram of detector sensitivity Optical sensors for light detection Prefabricated in different lengths (1 60m). Preset from factory, no need for riskfull calibration. Fibre optical cable to ensure EMC immunity Wide angle sensitive lens (to detect any arc) May 20, 2013 UFES Slide 23
21 Ultra Fast Earthing Switch UFES Content 1. Effects of an internal arc 2. The new Ultra Fast Earthing Switch UFES 3. Retrofit solutions with Ultra Fast Earthing Switch UFES 4. Advantages 5. Application examples May 20, 2013 UFES Slide 24
22 Retrofit solutions with UFES Retrofitting with an integrated UFES thus provides an additional, active protection system for air-insulated switchgear installations The system brings advantages to every air insulated medium voltage switchgear installation, irrespective of its test classification (IAC, non-iac qualified or open). One retrofit solution can monitor up to150 switchgear compartments by use of the additional system component TVOC. May 20, 2013 UFES Slide 25
23 Retrofit solutions with UFES UFES service-box mounting example 1/2 Top-mounting For all air insulated switchgear Connection to the busbar of the switchgear system by copper bars. UFES service-box with pressure relief can be directly mounted over pressure relief of switchgear. Smooth exchange process of UFES poles. May 20, 2013 UFES Slide 27
24 Retrofit solutions with UFES UFES service-box mounting example 2/2 Side-mounting Further universal mounting possibility. Independent of panel width. Connection to the busbar of the switchgear system by copper bars. Mounting either vertical or horizontal, depending on position of busbar in switchgear. Smooth exchange process of UFES poles. May 20, 2013 UFES Slide 28
25 UFES retrofit IAC tests Overview UFES top and side box assembly electronics open c.b. comp. May 20, 2013 UFES Slide 31
26 UFES retrofit IAC tests Results both tests fulfilled assessment criteria according to IEC : No.1: No.2: No.3: No.4: No.5: Correctly secured doors and covers do not open No fragmentation of the enclosure occurs and no parts more then 60 g fly away. Arcing does not cause holes in the accessible sides up to a height of 2 m Indicators do not ignite due to the effects of hot gases The enclosure remains connected to its earthing point May 20, 2013 UFES Slide 32
27 Ultra Fast Earthing Switch UFES retrofit Content 1. Effects of an internal arc 2. The new Ultra Fast Earthing Switch UFES 3. Retrofit solutions with Ultra Fast Earthing Switch UFES 4. Advantages 5. Application examples May 20, 2013 UFES Slide 33
28 Retrofit solutions with UFES Unbeatable advantages Benefit Greatly increased system availability by avoidance of heavy damages inside the switchgear, of the equipment and the direct environment Drastic reduction of downtimes and repair costs Example for a production site e.g. in chemical-, paper- or oil industry Risks: Exchange of damaged switchgear panel(s) or equipment necessary Consequence: Loss of production for possibly some days or weeks Costs: Up to multiple EUR / day possible May 20, 2013 UFES Slide 34
29 Retrofit solutions with UFES Sales argument. Increased operator safety No damage in switchgear Avoid downtime Increased switchgear life Save lives Save equipment Save production Save investments Save money! May 20, 2013 Slide 36
30 Ultra Fast Earthing Switch UFES retrofit Content 1. Effects of an internal arc 2. The new Ultra Fast Earthing Switch UFES 3. Retrofit solutions with Ultra Fast Earthing Switch UFES 4. Advantages 5. Application examples May 20, 2013 UFES Slide 37
31 Retrofit solutions with UFES Two incomers, two coupled protection areas May 20, 2013 UFES Slide 41
32 May 20, 2013 UFES Slide 42
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