核电厂变压器零序差动保护配置及其整定计算
Design and Setting of Zero-sequence Current Differential Protection for Transformers in Nuclear Power Plants
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摘要:
百万核电机组的主变压器通常由3台500 kV单相变压器构成，单相接地故障是其主要故障型式之一，零序电流差动保护是针对单相接地故障的主保护。目前可供选用的零序电流差动保护装置的保护原理主要是比例制动式差动保护，在技术细节上仍存差异，保护整定计算方法不同，对电流互感器的配置适应性也不同。针对两类不同的零序电流差动保护原理，并分析其适应的不同情况，提出核电厂主变压器零序电流差动保护设计方案及其保护整定计算方法。 Abstract:1 000 MW nuclear power unit's main transformer usually consists of three 500 kV single-phase transformers, single-phase ground fault is one of the main fault types, and zero-sequence current differential protection is the main protection against single-phase ground fault. Currently the protection principle for zero-sequence current differential protection device is mainly rate restraint differential protection, however, the differences still exists between technical details, the calculation methods for protection settings and the adaptabilities to the current transformer configuration are also different. In this paper, considering two different types of zero-sequence current differential protection principle, by analyzing the different situations they adopt to, it proposed a design of nuclear power plant main transformer's zero-sequence current differential protection and its protection setting calculation
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