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隨著高壓開關設備的型式試驗考核項目逐漸增多,工頻試驗變壓器的試驗工況也變得復雜,對其絕緣性能的要求更加苛刻。為了使試驗變壓器運行在安全工況下,并采取可靠的防護措施,需要對其運行工況做出清晰的判斷。文中介紹了在工頻耐受電壓試驗、聯(lián)合加壓試驗和隔離開關開合容性小電流試驗中試驗變壓器承受的穩(wěn)態(tài)電壓和暫態(tài)過電壓,以及實際試驗中采取的保護措施;提出了對試驗變壓器入口端VFTO進行建模仿真和實測研究以及利用磁環(huán)原理抑制VFTO侵入的建議。文中對工頻試驗變壓器的設計制造和選型、試驗標準的修訂以及工頻試驗變壓器壽命研究具有一定的參考意義。