01144nam0-22004091--450-99000723173040332120110923104658.0000723173FED01000723173(Aleph)000723173FED0100072317320090217d1981----km-y0itay50------baitaITy---n---001yy<<Il >>sindacato nello statoa cura dell'IRSI, Istituto di ricerche sui problemi dello Stato e delle istituzioniRomaEd. Lavoro1981179 p.22 cmStudi e ricerche20331.8342Istituto di ricerche sui problemi dello Stato e delle istituzioniITUNINARICAUNIMARCBK990007231730403321DPR 28-580/B275DECB-V-74147 dip.DDRCVI I 305s.i.DDAVI I 3054379DDAXXVIII 883412DDCICDECDDADDRCDDADDCICSindacato nello stato687526UNINA01356nam0 2200337 i 450 VAN006778420110201112204.78988-15-01491-820090311d1987 |0itac50 baitaIT|||| |||||ˆL'‰infanzia dell'Europaeconomia e società dal 10. al 12. secoloRobert FossierBologna : Il mulino19871027 p. ; 22 cmTrad. di Tukeri Capra.001VAN00051232001 Collezione di testi e di studi. Storiografia210 BolognaIl Mulino.VAN0080242Enfance de l'Europe.28102FranciaEconomiaSec. 10.-12.VANC025804FIFranciaStoria socialeSec. 10.-12.VANC025805FIBolognaVANL000003330.9440121FossierRobertVANV022338147210CapraTukeriVANV053759Il Mulino <editore>VANV107886650ITSOL20230616RICABIBLIOTECA DEL DIPARTIMENTO DI LETTERE E BENI CULTURALIIT-CE0103VAN07VAN0067784BIBLIOTECA DEL DIPARTIMENTO DI LETTERE E BENI CULTURALI07CONS Vd 740 07 9433 20090311 Enfance de l'Europe28102UNICAMPANIA05213nam 22006614a 450 99621713810331620230829004834.00-470-61222-31-280-60345-397866106034591-84704-456-50-470-39445-51-84704-556-1(CKB)1000000000335565(EBL)700724(OCoLC)769341517(SSID)ssj0000229544(PQKBManifestationID)11198491(PQKBTitleCode)TC0000229544(PQKBWorkID)10172183(PQKB)10167876(MiAaPQ)EBC700724(MiAaPQ)EBC261976(Au-PeEL)EBL261976(OCoLC)156937664(EXLCZ)99100000000033556520060313d2006 uy 0engur|n|---|||||txtccrProtection of electrical networks[electronic resource] /Christophe PrévéLondon ;Newport Beach, CA ISTEc20061 online resource (510 p.)ISTE ;v.94Includes index.1-905209-06-1 Protection of Electrical Networks; Table of Contents; Chapter 1. Network Structures; 1.1. General structure of the private distribution network; 1.2. The supply source; 1.3. HV consumer substations; 1.4. MV power supply; 1.4.1. Different MV service connections; 1.4.2. MV consumer substations; 1.5. MV networks inside the site; 1.5.1. MV switchboard power supply modes; 1.5.2. MV network structures; 1.6. LV networks inside the site; 1.6.1. LV switchboard supply modes; 1.6.2. LV switchboards backed up by generators; 1.6.3. LV switchboards backed up by an uninterruptible power supply (UPS)1.7. Industrial networks with internal generation1.8. Examples of standard networks; Chapter 2. Earthing Systems; 2.1. Earthing systems at low voltage; 2.1.1. Different earthing systems - definition and arrangements; 2.1.2. Comparison of different earthing systems in low voltage; 2.1.2.1. Unearthed or impedance-earthed neutral (IT system); 2.1.2.2. Directly earthed neutral (TT system); 2.1.2.3. Connecting the exposed conductive parts to the neutral (TNC - TNS systems); 2.2. Medium voltage earthing systems; 2.2.1. Different earthing systems - definition and arrangements2.2.2. Comparison of different medium voltage earthing systems2.2.2.1. Direct earthing; 2.2.2.2. Unearthed; 2.2.2.3. Limiting resistance earthing; 2.2.2.4. Limiting reactance earthing; 2.2.2.5. Peterson coil earthing; 2.3. Creating neutral earthing; 2.3.1. MV installation resistance earthing; 2.3.2. Reactance or Petersen coil earthing of an MV installation; 2.3.3. Direct earthing of an MV or LV installation; 2.4. Specific installation characteristics in LV unearthed systems; 2.4.1. Installing a permanent insulation monitor; 2.4.2. Installing an overvoltage limiter2.4.3. Location of earth faults by a low frequency generator (2-10 Hz)2.5. Specific installation characteristics of an MV unearthed system; 2.5.1. Insulation monitoring; 2.5.2. Location of the first insulation fault; Chapter 3. Main Faults Occurring in Networks and Machines; 3.1. Short-circuits; 3.1.1. Short-circuit characteristics; 3.1.2. Different types of short-circuits; 3.1.3. Causes of short-circuits; 3.2. Other types of faults; Chapter 4. Short-circuits; 4.1. Establishment of short-circuit currents and wave form4.1.1. Establishment of the short-circuit at the utility's supply terminals4.1.2. Establishment of the short-circuit current at the terminals of a generator; 4.2. Short-circuit current calculating method; 4.2.1. Symmetrical three-phase short-circuit; 4.2.1.1. Equivalent impedance of an element across a transformer; 4.2.1.2. Impedance of parallel links; 4.2.1.3. Expression of impedances as a percentage and short-circuit voltage as a percentage; 4.2.1.4. Impedance values of different network elements; 4.2.1.5. Contribution of motors to the short-circuit current value4.2.1.6. Example of a symmetrical three-phase short-circuit calculationThis book, designed for engineers, technicians, designers and operators working with electrical networks, contains theoretical and practical information on the design and set-up of protection systems.Protection of Electrical Networks first discusses network structures and grounding systems together with problems that can occur in networks. It goes on to cover current and voltage transformers, protection functions, circuit breakers and fuses.Practical explanations of how protection systems function are given, and these, together with tables of settings, make this book suitable for any rISTEElectric networksProtectionElectric networksProtection.621.319/2621.3192Preve Christophe1964-985539MiAaPQMiAaPQMiAaPQBOOK996217138103316Protection of electrical networks2252748UNISA01035nas 2200373 c 450 991089518590332120171201131836.0(CKB)3790000000121018(DE-599)ZDB2493848-8(OCoLC)638045325(DE-101)994061927(EXLCZ)99379000000012101820090506a20089999 |y |gerur|||||||||||txtrdacontentcrdamediacrrdacarrierImpactZHAW Zürcher Hochschule für Angewandte Wissenschaften ; Alumni ZHAWWinterthurZHAW2008-Online-RessourceGesehen am 16. Februar 2017ZHAW-ImpactZeitschriftgnd-content37024,2ssgnZürcher Hochschule für Angewandte Wissenschaftenisb8999DE-1019999JOURNAL9910895185903321Impact977235UNINA