Control cabinet practical engineering short-circuit and temperature rise under control?

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1 Control cabinet practical engineering short-circuit and temperature rise under control? siemens.com/panelbuilding

2 Agenda Fundamentals of short-circuit Highest short-circuit current Lowest short-circuit current Short-circuit in the main circuit Infeed and Load feeders Some definitions SIMARIS planning tools SIMARIS curves SIMARIS project SIMARIS design Temperature rise in control cabinets Noen regler og normer SIMARIS therm 2 software for varmeberegning Seite 2

3 Why short-circuit current consideration? Possible faults Video: Short-circuit test Overload Overcurrents Overtemperature Overload currents Short-circuit current Seite 3

4 Possible short-circuits Short-circuit Coincidental or intentional conductive connection between two or more conductive parts, via which the electrical differences in potential between these conductive parts is forced to zero or nearly zero. Short-circuit types 1-pole short-circuit 2-pole short-circuit 3-pole short-circuit As a rule, the 1-pole short-circuit generates the lowest short-circuit current. Seite 4 As a rule, the 3-pole short-circuit generates the highest shortcircuit current.

5 Agenda Fundamentals of short-circuit Highest short-circuit current Lowest short-circuit current Short-circuit in the main circuit Infeed and Load feeders Some definitions SIMARIS planning tools SIMARIS curves SIMARIS project SIMARIS design Temperature rise in control cabinets Noen regler og normer SIMARIS therm 2 software for varmeberegning Seite 5

6 Dividing up into infeed and load feeders Infeed Short-circuit protection of the control cabinet Overload protection (cables) in the control cabinet Main switch for safe ctivation/deactivation of the system Protecting and switching in the infeed LS 1.1A.1a NS-LS 1.1A.1b NSHV 1.1A Load feeders Short-circuit protection of the load feeder Overload protection of the cables and loads Switching On/Off individual load feeders instead of the entire system Protecting and switching loads NSUV 1.1A.1 M M M M M Seite 6

7 Agenda Fundamentals of short-circuit Highest short-circuit current Lowest short-circuit current Short-circuit in the main circuit Infeed and Load feeders Some definitions SIMARIS planning tools SIMARIS curves SIMARIS project SIMARIS design Temperature rise in control cabinets Noen regler og normer SIMARIS therm 2 software for varmeberegning Seite 7

8 Definition of I cu and I cs IEC defines Rated ultimate short-circuit breaking capacity I CU Rated service short-circuit breaking capacity I CS This current must be disconnected twice by the circuit breaker without damage Then the device must be replaced or examined This current must be disconnected three times by the circuit breaker without damage The circuit breaker must then be capable of carrying the operational current Listing of the number of short-circuit releases for evaluating the functional capacity. I CU : A layout according to I CU is recommended if the risk of a short-circuit is very slight. I CS : A layout according to I CS is recommended if a very high degree of plant availability is required. Seite 8

9 Definition of I cu and I cs Data sheet excerpt 3RV2021-4EA10 (27 32 A) Seite 9

10 Selectivity definition of term Q1 Q1 Q3 Q2 Q3 Q2 A system with several protection devices switched in series is selective if only the protection device (Q2) directly in front of the fault location (when viewed in the direction of energy flow) is activated in the event of a fault and this alone interrupts the fault. Branches not affected (e.g. Q3) continue to be supplied. Selectivity manual 3VA Selectivity tables of 3VA If the protection equipment in the upstream electric circuit (Q1) disconnects in addition to the protection equipment in the electric circuit affected (Q2), the power supply is interrupted for other electric circuits not affected by the fault. This type of configuration is referred to as a non-selective behavior. Engineering Tip Seite 10

11 Back-up protection Back-up protection If the benefit of a current-limiting higher-level protection unit (Q1), which supports a downstream protection unit (Q2) to connect overcurrents which are higher than its short-circuit breaking capacity. The higher-level protection unit also trips (depending on the value of the overcurrent). Q1 Q2 Seite 11

12 Back-up protection Link: Back-up tables 3VA Seite 12

13 Agenda Fundamentals of short-circuit Highest short-circuit current Lowest short-circuit current Short-circuit in the main circuit Infeed and Load feeders Some definitions SIMARIS planning tools SIMARIS curves SIMARIS project SIMARIS design Temperature rise in control cabinets Noen regler og normer SIMARIS therm 2 software for varmeberegning Seite 13

14 Overview of SIMARIS planning tools SIMARIS planning tools provide efficient support for the dimensioning of electrical power distribution and determining the necessary devices and distribution boards. SIMARIS curves Display of tripping characteristics, let-through current and let-through energy curves (license free of charge) SIMARIS design Network calculation and dimensioning (basic license free of charge, professoinal license 985) SIMARIS project Calculation of space requirement for power distribution systems, budgets, and tender document texts (license free of charge) SIMARIS therm Calculation of the internal temperature of the control panel (free of charge, no license) Page 14

15 Summary of the SIMARIS design SIMARIS design Free tool for network calculation complete documentation Seite 15

16 Benefits of SIMARIS design Short-circuit view in the network planning Maximum short-circuit current & minimum short-circuit current Seite 16

17 Benefits of SIMARIS design Dimensioning goal Back-up protection Selectivity Seite 17

18 Benefits of SIMARIS design Professional Selectivity view at a glance via color identification Seite 18

19 Summary of the SIMARIS design View of the short-circuit currents in the project display Seite 19

20 Agenda Fundamentals of short-circuit Highest short-circuit current Lowest short-circuit current Short-circuit in the main circuit Infeed and Load feeders Some definitions SIMARIS planning tools SIMARIS curves SIMARIS project SIMARIS design Temperature rise in control cabinets Noen regler og normer SIMARIS therm 2 software for varmeberegning Seite 20

21 Varmetapsverfikasjon iht. IEC/EN61439 Tavler inndeles i 3 grupper: Tavle med ett felt hvor merkestrømmen ikke overskrider 630A Tavler med ett eller flere felter hvor den totale merkestrøm ikke overskrider 1600A Tavler med merkestrøm på mer enn 1600A Seite 21

22 Varmetabsverfikasjon iht. IEC/EN61439 Tavle med ett felt på maks. 630A: Enkel sammenligning av komponenters / ledningers varmetap i forhold til tavlens varmekapasitet, hvis: Det finnes effekt taps tall på alle komponenter Komponenter er symetrisk fordelt i skapet Belastningsstrømmen på den enkelte krets ikke overtiger 80% av komponenters merkestrøm (rated free air thermal current I th ) Mekanisk oppbygning og komponenters plassering gjør at luftsirkulasjonen ikke blir veldig begrenset. Ledere som fører mer enn 200A skal være plassert slik at hvirvelstrømstap blir minimert. Alle ledere skal ha ett tverrsnitt som er beregnet for 125% av den aktuelle belastningstrømmen i kretsen Seite 22

23 Varmetabsverfikasjon iht. IEC/EN61439 Tavler med ett eller flere felter med maks. total merkestrøm 1600A : Varmetapsverifikasjon via kalkulasjon kan lages iht. IEC60890, hvis: Samme betingelser som for ett enkelt felt tavle er til stede + I tavler med naturlig ventilasjon skal arealet for udblåsningen vere 1,1 ganger intaket. Det kan maks. være 3 vannrette skilleplater per tavle eller seksjon i tavlen Krav til areal for naturlig ventilasjon i tavler med flere vannrette felt. IEC60890 A method of temperature-rise verification of low-voltage switchgear and controlgear assemblies by calculation Seite 23

24 Varmetabsverfikation iht. IEC/EN61439 Tavler med merkestrøm på mer enn 1600A: Varmetapsverifikasjon kan kun lages ved test eller bruk av ett testet design. Tavlestål fabrikanten vil utføre disse testene og angi resultatet i deres projekteringsmanual / designverktøy. Siemens vern er testet i bl.a.: Seite 24

25 Software til varmetabsverifikation Simaris Therm 2 Kan anvendes til varmetapsverifikasjon iht. IEC/EN61439 både ved: Enkel sammenligning for tavler opp til 630A Beregning iht. IEC60890 for tavler opp til 1600A Komponenter: Database med ca Siemens varenummre Mulighet for å tilføye brukerdefinerte komponenter Tavlestål: Siemens 8MF1 og Alpha tavler er integrert i programmet Mulighet for brukerdefinert tavlestål Seite 25

26 Integrated Control Panels: The easy way to optimized control panels Få mer informsjon online!

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