Casus Analyse Abnormalis Circuitus Secundarii in Transformatoribus Voltatis

1. Situatio Defectus

In mensis Septembris anno 2023, ut operarius frontalis in defectionibus reparationum, detexi tensionem anormalem in sectione I bus 10kV substationis dum vigilabam et notificavi team operationis et maintenance. Systema monitorii ostendit: U₀ = 0 kV, U_a = 6.06 kV, U_b = 5.93 kV, Uc = 6.05 kV, U_ab = 10.05 kV, U_bc = 5.94 kV

Ego et meus team properavimus ad locum. Suspectavimus circuitum interruptoris aeris secundarii transformatoris tensio-metri sectionis I bus 10kV clausum esse et fusum U-phasium fractum invenimus. Post disjunctionem huius interruptoris, circuitus interruptoris bus-sectionis 900 auto-activatus est, tripulans interruptorem 95A lateris 10kV primi transformatoris principali et inter-tripulans lineas 911–915, deinde claudens 900.

Post restituendo circuitum secundarium, inspectavimus corpus transformatoris tensio-metri et fusum (utrumque normale). Inspectando circuitum secundarium, inveni terminalem A660 laxum in armario. Stringendo eum restituitur tensio normalis in sectione I bus 10kV.

2. Analyse Causae

Section I bus 10kV habet 6 alimenta, 5 (911–915) connecta ad hydroelectricas minores. In plena generatione, currentus oneris lateris 10kV primi transformatoris principali descendit, elevans tensionem bus.

Operatores et maintenancii, confidentes in experientia, disjuncti sunt interruptorem aeris secundarii transformatoris tensio-metri sine analysi impactus in dispositivos protectionis. Tunc, cum currentus interruptoris 95A (≈48A) satisfacit conditioni sine-tensione/sine-currente backup automatici (valore secundario: 25V, 0.02A), activavit se backup automaticus, tripulans interruptorem 95A et inter-tripulans 5 alimenta hydroelectricarum minorum. Causa radicalis fuit non-exitus backup automatici durante tractatione abnormalis transformatoris tensio-metri, causans misoperationem.

3. Praesidia Preventiva

Transformatores tensio-metri capaciti variis habent defectibus, output tensionis secundariae anormalis interdum occurrens. Operatores et maintenancii frontales debent:

• Strengthen department management, collect more data, and monitor alarms to detect abnormalities early.

• Analyze danger points in voltage transformer handling, update on - site operation regulations. Before replacing fuses (or similar tasks), check the main transformer’s current and auto - backup settings. If the current is below the no - current threshold, follow procedures to exit auto - backup.

• Regularly revise measures for “three - mistake” (mis - operation, mis - wiring, mis - setting) accidents, conduct training. Standardize emergency disposal processes to avoid improper actions.

• Enhance on - site risk control; clearly label equipment at risk of misoperation.