Circuit for routine experiments without removing high-voltage leads

The utility model discloses a circuit for routine experiments without removing high-voltage leads, comprising a tested object CVT (Constant-Voltage Transformer). The tg Delta of an upper joint C1 of the CVT and a capacitance testing terminal are reversely connected; the upper-end lead A of the C1 is grounded; the lower-end lead B of the C1 is connected with a high-voltage core wire; the lower-end lead C of a middle joint C2 is connected with a high-voltage shielding wire; the Delta of the CVT is grounded; and an XL is split. The lower joint C1 of the CVT is positively connected. The middle joint of the CVT is positively connected; and a tested power supply bears the current of two capacitors that are arranged in parallel. By adopting the circuit, without removing the high-voltage leads, the measurement results of the middle joint and the lower joint of phases A, B and C are basically the same with the testing results obtained after the leads are removed; furthermore, the dielectric loss of the upper joint is