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JDZ(X)W-33 Outdoor Voltage Transformer - 33kV, Epoxy-Cast
- Praevisio
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JDZ(X)W-33 Outdoor Voltage Transformer - 33kV, Epoxy-Cast
Serie JDZ(X)W-33 est transformatorum tensionis exterorum monofasorum, confectionum in resina epoxy, ad systemata distributionis mediom-tensionis 33 kV ad frequentionem 50 Hz vel 60 Hz. Fabricati secundum normas IEC 61869-3 et GB/T 20840.3, praebent mensuram tensionis accuratam, mensurationem redituum et suppeditationem tensionis ad relays protectionis pro apparatibus interruptivis 33 kV, stationibus transformationis et unitatibus annularibus principalibus per Africam, Asiam Meridiem et Asiam Sud-Orientalem.
Haec serie comprehendit quattuor variantes, quae ad diversa ordinamenta avvolvulorum secundariorum adaptantur:
- JDZW-33: unum avvolvulum primum, unum avvolvulum secundarium, ratio 33/0.11 kV. Unitas normalis pro mensuratione et protectione in systematibus 33 kV cum neutro terrato.
- JDZ9-33: ut supra, sed cum ratione 33/0.1 kV, altera tensio secundaria pro certis schematibus relays et mensuratorum.
- JDZXW-3: unum primarium, tria secundaria (1a1n pro metiendo / 2a2n pro indicando / dadn pro residuo), ratio 33/√3 ad 0.11/√3 kV. Pro retibus cum neutro terrato, ubi inductio residui tensionis requiritur pro protectione contra defectus terrae.
- JDZX9-3: ut JDZXW-3, eadem configuratione trium inductorum et eodem gradu isolationis, varians dimensionibus.
QUID TRANSFORMATOR TENSIONIS FACIT ET CUR SPECIFICATIO VALET
Transformator tensionis magnam tensionem primariam minuit ad standardem tensionem secundariam 100 V vel 110 V, quam metra, relais protectionis et systemata SCADA tuto uti possunt. Classis accuratiae regit qualitatem mensurationis: classis 0.2 specificatur pro metiendo redituum et directione energiae, ubi accuratio facturationis obligatio commercialis est; classis 0.5 sufficit pro indicatione in tabulis, mensuratione factoris potentiae et instrumentis non pro facturatione; classis protectionis 6P aut 3P specificatur pro circuitibus relais, ubi transformator tensionis accuratus manere debet durante defectu.
Burden must be checked against the secondary circuit. A VT delivers rated accuracy only up to its rated output VA. Over-burdened VTs are out of class regardless of nameplate rating, and in a revenue metering application that means the meter is legally incorrect.
EPOXY-CAST CONSTRUCTION FOR OUTDOOR SERVICE
The active parts are fully encapsulated in flame-retardant cycloaliphatic epoxy resin, sealed against moisture, dust, salt fog and UV degradation. No oil, no breathing, no periodic oil sampling. This is what makes epoxy-cast construction the standard choice for outdoor 33kV installations across coastal Africa, the Gulf and South Asia, where conventional oil-filled units require regular oil maintenance and oil disposal in markets where those services are not readily available.
VOLTAGE FACTOR AND NEUTRAL EARTHING
Pro variantibus tribus vinculis JDZXW-3 et JDZX9-3, factor voltationis nominis specificandus est ut cum dispositione terrae retis congruat. In systemate 33 kV firmiter terrato, 1,2 continuus est norma. In systemate neutro isolato aut resonanter terrato, specifica 1,9 pro 30 secundis, quod permittit relais videre plenam tensionem displacementis durante defectu terrae monofasiali sine saturatio nuclei VT.
Applicationes principali
- Metiri energiam pro reditu et sub-facturatione ad 33 kV: specifica classis 0,2 in vinculo metiendi (1a1n) ut exigentiae exactitudinis facturationis utilitatis implerentur. VT classis 0,5 ubi classis 0,2 requiritur significat metrum contractu incorrectum esse.
- Metiri et indicare tensionem catenarum in tabellis interruptorum 33 kV: classis 0,5 in vinculo indicationis (2a2n) pro voltmetris tabellarum, synchroscopiis et intris SCADA pro tensione.
- Protektio pro defectu terrae et supra-tensione residua per anulum apertum (dadn) in variantibus JDZXW-3 et JDZX9-3 — anulus residuus transmittit signum tensionis displacement ad relais pro defectu terrae dum fit defectus unius fasi in rete isolata aut terra-resistiva.
- Protektio primaria transformatoris in circuitibus alimentatoris 33 kV, praebens referentiam tensionis pro relais supra-curentis directionalis et protektionis distantiae.
- Verificatio tensionis pro synchronisatione et auto-reclutione in tabellis accoplatorum et sectionum omnibus 33 kV.
- Protektio et mensura banchorum capacitatum in banchis compensationis 33 kV.
- Tabellae metiendi et protegendi pro substationibus elevatricibus 33 kV in agris solaribus PV et aereolis, praesertim in locis litoralibus et desertis ubi constructio epoxidica hermetica est necessaria.
- Substationes distributionis publicae in rete 33 kV per Africam Sub-Saharanam, Asiam Meridiem et Asiam Sud-Orientalem.
- Substationes primariae in plantis industrialibus quae accipiunt supplitium 33 kV in fabricis minerarum, ferri, cementi et petrochimicorum.
- Retrofit into existing 33kV switchgear where the original oil-filled VT is life-expired or leaking.
WINDING SELECTION GUIDE
- JDZW-33 / JDZ9-33: single secondary, for straightforward metering and protection where a separate residual winding is not required. Simpler secondary circuit, lower burden allocation.
- JDZXW-3 / JDZX9-3: triple secondary, for networks requiring simultaneous revenue metering (0.2 class), indication (0.5 class) and earth-fault protection (6P class) from a single primary unit. The added open-delta winding is mandatory for earth-fault relay supply on isolated and resistance-earthed 33kV networks.
Congruentia Regionalis
- Africa: 33kV networks across Nigeria, Kenya, South Africa, Ghana, Tanzania and Uganda. Outdoor epoxy-cast construction suited to tropical humidity, coastal salt fog and industrial pollution environments.
- South Asia: 33kV distribution in India, Pakistan, Bangladesh and Sri Lanka. Available at 50Hz.
- Southeast Asia: 33kV industrial and utility substations at 50Hz.
- Medio Oriente: forniture per impianti industriali a 33 kV. Progetti in Arabia Saudita verificati a 60 Hz su richiesta.
Non idoneus pro
Installazione interna in quadri chiusi senza involucro impermeabile – specificare una variante VT per interni. Sistemi inferiori a 33 kV – specificare JDZXW-11 o equivalente di classe 12 kV. Sistemi superiori a 33 kV – specificare classe 66 kV o 110 kV. Applicazioni di misurazione tariffaria con avvolgimento indicatore (classe 0,5) senza avvolgimento di misurazione separato classe 0,2 – la classe di accuratezza deve corrispondere all’obbligo di fatturazione.
DATI TECNICI – Serie di trasformatori di tensione JDZ(X)W-33
Conformità: IEC 61869-3, GB/T 20840.3
| Item | JDZW‑33 | JDZ9‑33 | JDZXW‑3 (a tre avvolgimenti) | JDZX9‑3 (a tre avvolgimenti) |
| Relatio tensionis nominatae | 33 / 0,11 kV | 33 / 0,1 kV | 33/√3 kV (primarius) | 33/√3 kV (primarius) |
| Secundarii nominis tensiones | ‑ | ‑ | 1a1n: 0.11/√3 kV 2a2n: 0.11/√3 kV dadn: 0.11/√3 kV | 1a1n: 0.11/√3 kV 2a2n: 0.11/√3 kV dadn: 0.11/√3 kV |
| Frequentia censita | 50 Hz / 60 Hz | 50 Hz / 60 Hz | 50 Hz / 60 Hz | 50 Hz / 60 Hz |
| Nominis outputus—0.2 classis vinculum | 60 VA | 60 VA | 1a1n: 30 VA | 1a1n: 30 VA |
| Nominis outputus—0.5 classis vinculum | 120 VA | 120 VA | 2a2n: 50 VA | 2a2n: 50 VA |
| Nominis residui vinculi outputus | ‑ | ‑ | dadn: 100 VA | dadn: 100 VA |
| Maximum output | 600 VA | 600 VA | 500 VA | 500 VA |
| Accuracia winding mensurandi | ‑ | ‑ | 1a1n: 0.2 2a2n: 0.5 dadn: 6P | 1a1n: 0.2 2a2n: 0.5 dadn: 6P |
| Nivel insulati nominati | 40.5 kV / 95 kV (BIL) / 185 kV (SI) | 40.5 kV / 95 kV (BIL) / 185 kV (SI) | 40.5 kV / 95 kV (BIL) / 185 kV (SI) | 40.5 kV / 95 kV (BIL) / 185 kV (SI) |
| Pondus netto/brutto | 105 kg / 112 kg | 95 kg / 102 kg | 58.5 kg / 65 kg | 55.5 kg / 62 kg |
| General insulation | Outdoor cycloaliphatic epoxy resin, fully encapsulated | |||
| Montatio | Outdoor, vertical or angled bracket | |||
| Status servitii | Suitable for outdoor installation, coastal and industrial pollution environments | |||
| Nota | Accuracy levels and secondary winding parameters can be customised on request |
SELEKTIO ANTE VENDITIONEM
- Winding configuration review against the protection and metering schedule: single-secondary JDZW-33 / JDZ9-33 for straightforward metering and protection; three-winding JDZXW-3 / JDZX9-3 where simultaneous revenue metering, indication and earth-fault relay supply are required from a single primary unit.
- Voltage factor specification against the network earthing arrangement. Solidly earthed 33 kV networks: 1.2 continuous. Isolated or resistance-earthed neutral: specify 1.9 for 30 seconds so the residual winding can supply the earth-fault relay across the full fault duration without VT core saturation.
- Calculus oneris secundarii. Praebete tabulam VA pro relectoribus et metris, necnon longitudines cavi secundarii; nos confirmabimus an spira portare possit onus coniunctum intra suum VA nominale ad classis accuratiarum requisitam.
- Selectio rationis tensionis secundariae: 33/0.11 kV (JDZW-33) aut 33/0.1 kV (JDZ9-33), ad specificata tensionis intrantis relectorum et metrorum accomodata. Confirmate ante ordinandum — errores rationis necessitant substitutionem transformatoris, non immutationem parametrorum relectoris.
- Combinationes classium accuratiarum non-standard et notae VA exirentis, ad petitionem, disponibiles sunt.
MARKET ACCESS AND DOCUMENTATION
- Rapportus examinorum typicorum ad IEC 61869-3 / GB/T 20840.3 cum expeditione emittuntur.
- Certificatio a tertio parte (KEMA, ASTA, CESI, TUV) ubi documenta licitationis exigunt probationem testis praesentis.
- Subsidium certificandi pro submissionibus SASO SABER, SONCAP, KEBS PVoC, ICIGI et GOST R, ubi ad mercatum destinatarium requiritur.
TESTING AND DELIVERY
- 100% routine testing before dispatch per IEC 61869-3: ratio and polarity verification, insulation resistance, power-frequency withstand, burden and accuracy class confirmation across the full voltage range.
- Individual routine test certificate supplied per serial number.
- Export packing with desiccant and moisture barrier for seaborne shipment.
- Documentation: routine test report, type-test certificate, dimensional drawing, wiring schematic, spare parts list.
Post-Venditio
- Installation and commissioning guidance, including secondary circuit burden verification and polarity confirmation.
- Replacement units confirmed against original mounting and terminal dimensions before dispatch — direct retrofit without switchgear modification.
- Technical response within 24 hours.
- Garantia: 18 menses ab expeditione aut 12 menses a commissione, quod prius exspirat.
Experimenta typorum
- Specimenis testatus ad IEC 61869-3 / GB/T 20840.3: exactitudo rationis per totum ambitum oneris, resistentia isolatio (frequentia potestatis, impulsus fulminis et impulsus commutationis), augmentum temperaturae, resistentia thermica brevi tempore, et durabilitas mechanica.
- Rapportus de testu speciminis a tertio partibus (KEMA, ASTA, CESI aut TUV) disponibiles sunt, ubi procuratio ab utilitatibus et EPC exigit probationem visam, non solum registra fabricantis.
Controlus materiae ingressae
- Resina epoxidica cycloaliphatica acceptata secundum certificatum conformitatis pro copia; qualificatio materiae regit proprietates dielectricas et resistentiam UV finitae encapsulationis.
- Materialis nucleus magneticus verificatus pro gradu et sectione transversali; gradus nucleus determinat linearitatem classis exactitudinis et characteristicam saturationis inductus protectionis.
- Diametrum fili primarii et secundarii et classis isolationis verificata pro singula copia.
- Exactitudo tabellae nominis examinata pro ratione, classe exactitudinis, onere, nivello isolationis et facto tensionis nominalis ante compositionem.
Inspectio in cursu productionis
- Epoxy casting processus monitoratus et registratus: temperaturae profili, vacui nivelis et curae cycli. Vacua in encapsulatione sunt principalis modus defectus isolationis externae, et vacui castatio est mensura de controllo.
- Dimensionalis inspectio post formandam: altitudo corporis isolantis, longitudo viae per superficiem et interfacies montandi verificatae sunt ad schemata.
- Ratio spira rum verificata est in primaria et in omnibus secundariis antennis ante encapsulationem.
- Testum descensus partiales in corpore encapsulato: descensus supra limitem indicat vacuum et unitas reicitur.
PROVE DI ROUTINE - 100%, NESSUN CAMPIONAMENTO
- Verificatio rationis et polaritatis ad oneris nominis in omnibus secundariis antennis.
- Confirmatio classis accuratiae ad 80 %, 100 % et 120 % tensionis nominis pro antennis metiendis; ad tensionem nominis pro antennis protectionis.
- Tensio sustinenda frequentialis potestatis in primaria antenna ad terram et trans terminales secundarias.
- Resistentia isolationis in omnibus antennis.
- Verificatio erroris compositi in antennis classis protectionis.
- Relazione di prova di routine numerata emessa per ogni unità.
TRACEABILITAS ET SYSTEMA
- Systema gestionis qualitatis ISO 9001.
- Tracibilitas numeri serialis ad partem epoxy, partem materiae centralis et registri productionis avolutionis.
- Tabula nominis perpetua cum ratione, classe praecisionis, onere, gradu isolationis, factori tensionis nominis et die fabricationis.
- I registri delle prove sono conservati per tutta la durata della garanzia e sono disponibili su richiesta.
