阻抗匹配平衡变压器的两继电器差动保护接线方式研究

Research On the Differential Protective Wiring Type of the Impedance Matching Balance Transformer in Two Relays

根据阻抗匹配平衡变压器高低压绕组接线方式和运行特点,根据变压器差动保护对接线方式的要求,深入研究了阻抗匹配平衡变压器高低压侧各电流的变化规律,提出了适用于这种变压器的三种差动保护接线方式,这三种接线方式能保证在各种正常运行方式下和各种外部短路时,各差动继电器的两差动臂电流大小相等、相位相同,差动继电器可靠不动作;而当发生各种内部短路时,至少有一个差动继电器流入短路电流的二次值,差动继电器将灵敏反应、可靠动作切除短路故障。

In this paper, the rule for the current variance of the high and low valtage side in a impedance matching balance transformer is deeply studied, according to its wiring type and operating characteristics as well as the requirements of the differential protective transformer to the wiring type. Base on this study three applicable differential protective wiring types.aree presented. Rely on them, under any normal operating mode or outer foult, no action of the diffcrcntial relay is insured, on account of the equal current quantity and the same phase of the three differential shouldcrs of every differential relay, while under any internal short circuit secondary quantity of short circuit current is receipted, by at least one differential relay, which will react detectively act reliably to clear the short-circuit fault.