Guide to Construction of ArTu switchgear - Abb

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7 Checking the overtemperature limits inside ArTuswitchgear7.3 Checking procedureIncoming and outgoing switchgear cablesThe power dissipated by the pieces of cable which enter the switchgear must be countedseparately.In some cases, the variability in length of these pieces causes their power to be negligible,whereas in others it is decisive for correct calculation of the dissipated power inside theswitchgear.The power dissipated by them can be calculated by means of the following relation:2IP (I b ) = P (I n )(b. LI n)piece. 3Where:P (I n) is the dissipated power per unit of length at the rated current and the its value canbe taken from table B1 of the IEC 60890 Standard given below, or from the manufacturer’scatalogues.(L piece. 3) is the length of the piece of cable inside the switchgear or of the column beingexamined, multiplied by 3 as it is a three-phase circuit. This length can be calculatedapproximately by inspecting the front of the switchgear.Table B1 of the IEC 60890 Standard was used for the calculations in this document, consideringan air temperature of 55°C around the cable.Operating current and dissipated powers of the insulated conductorsCrosssection(Cu)Maximum admissible temperature of the conductor: 70 °C(1)d d d dAir temperature around the conductors inside the housingGENERALSTANDARDS ANDCHARACTERISTICSVERIFYING THEOVERTEMPERATURESPROTECTION AGAINSTSHORT-CIRCUIT ANDELECTRIC SHOCKSoperating current35 °C 55 °C 35 °C 55 °C 35 °C 55 °Cdissipatedpowers (2)mm 2 A W/m A W/m A W/m A W/m A W/m A W/m1,52,546101625355070951201501852403001217222838522,12,52,62,83,03,7operating current81114182534dissipatedpowers (2)0,91,11,11,21,31,6operating current12202532486485104130161192226275295347400dissipatedpowers (2)2,13,53,43,74,85,66,37,57,98,48,79,611,710,912,013,2812182331425567851051251471671912252600,91,31,81,92,02,42,63,13,43,63,74,14,34,65,05,6122025325065851151501752252502753504004602,13,53,43,75,25,86,37,910,59,911,911,711,715,415,917,5(1) Each desired layout, with the specific values, refers to a group of conductors gathered together in a bundle (sixconductors loaded at 100%)(2) Single lengthoperating currentdissipatedpowers (2)operating currentdissipatedpowers (2)operating current812202532506585115149175210239273322371dissipatedpowers (2)0,91,32,22,32,13,43,75,06,27,27,28,38,89,410,311,4PRACTICAL INDICATIONSCERTIFICATION ANDCONSTRUCTIONCERTIFICATESDECLARATION OFCONFORMITYABB SACE Guide to Construction of ArTu switchgear 21
7 Checking the overtemperature limits inside ArTuswitchgear7.3 Checking procedureGENERALSTANDARDS ANDCHARACTERISTICSVERIFYING THEOVERTEMPERATURESPROTECTION AGAINSTSHORT-CIRCUIT ANDELECTRIC SHOCKSCalculation of the overtemperatureThe value of the overtemperature inside the switchgear can be calculated by means of ABBSACE software tools such as DMBWin or DOCWin.The parameters required by the software are as follows:• linear dimensions of the switchgear (height, length, width)• methods of installation (exposed separate, separate wall-mounted, ..)• air inlet area(the Standard prescribes an air outlet area at least equal to 1.1 times the inlet one, otherwisethe inlet area must be reduced by 10 % in relation to the actual one)•• ambient temperature• number of horizontal segregations• total dissipated powerUsing the same method or tool, the following is calculated:• the air temperature at mid height and at the top of the switchgear to be constructed (O R);• the air temperature at mid height and at the top of the tested switchgear (O P ).If:both at the top and at mid height, then the switchgear to be constructed conforms (ANS);O R ≤ O PO R ≥ O Por at the top or at mid height, then the switchgear to be constructed cannot beconsidered to conform and redesigning it must be considered.PRACTICAL INDICATIONSCERTIFICATION ANDCONSTRUCTIONCERTIFICATESDECLARATION OFCONFORMITYIn the extracts from test certificates, in point 7.4, both the temperatures calculated with DMBWinand the temperatures measured during the test are given. The latter must not be used for thecomparison.N. B.To obtain an air temperature the same as or lower than the tested switchgear starting at thesame or higher power than the switchgear to be constructed, where this is compatible withdesign limitations, one can:• use a structure with larger linear dimensions• position the switchgear in an air-conditioned environmental with average ambienttemperature lower than 35°C• use an installation method which allows greater ventilation of the switchgear• use a device for forced ventilation of the switchgear.These parameters can be inserted in the overtemperature calculation in order to calculate theovertemperature inside the switchgear to be tested.On the other hand, the different degrees of protection, and even less the different forms ofsegregation cannot be taken into account to obtain lower overtemperatures.22 ABB SACEGuide to Construction of ArTu switchgear
Page 1 and 2: Technical guideGuide toConstruction
Page 3 and 4: 1 Standards relative to switchgear
Page 5 and 6: 2 Rated electrical characteristics
Page 7 and 8: 2 Rated electric characteristics of
Page 9 and 10: 3 Classification of electric switch
Page 11 and 12: 4 IP degree of protection in ArTu s
Page 13 and 14: 4 IP degree of protection and heati
Page 15 and 16: 6 Forms of segregationGENERALSTANDA
Page 17 and 18: 7 Checking the overtemperature limi
Page 21: 7 Checking the overtemperature limi
Page 31: 7 Checking the overtemperature limi
Page 46 and 47: 8 Protection against the effects of
Page 52 and 53: 9 Protection against electric shock
Page 54 and 55: 9 Protection against electric shock
Page 56 and 57: SACESACE10 Practical indications fo
Page 58 and 59: 10 Practical indications for constr
Page 60 and 61: 10 Practical indications for constr
Page 62 and 63: 11 Guide to certification according
Page 70 and 71: 12 Example of construction of ArTu
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12 Example of construction of ArTu
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12 Example of construction of ArTu
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Annex A: LOVAG ACAE certificatesIGA
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SACESACESACESACEAnnex A: LOVAG ACAE
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SACESACESACESACEAnnex A: LOVAG ACAE
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SACEAnnex A: LOVAG ACAE certificate
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Annex B: forms for the declaration
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Annex B: forms for the declaration
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Certificato N°OHS-015Certificato N
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Guide to Construction of ArTu switchgear - Abb

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