Although synthetic test method has been widely applied in breaking test of circuit-breaker, as synthetic making test under full voltage, it has been relatively less studied and applied.
合成试验方法在断路器开断能力考核中得到了广泛应用，但就额定电压下的合成关合来说其研究和应用相对较少。
High-voltage synthetic circuit which is a kind of economic and effective test equipment works very well in breaking ability test for high-voltage switch.
高压合成回路则是一种用于高压开关分断能力试验的经济有效的试验装置，能较好地反映开关的开断能力。
PT breaking and ferro-resonance caused by single-phase grounding and PT saturation are common faults in medium-low voltage power networks, which make voltage abnormal.
在中低压电网中，PT断线、单相接地及由PT饱和引起的铁磁谐振均是多发性的故障，这些故障都能使电压异常。
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