Risk and Countermeasures of Relay Protection Safety Work in 220 kV Substation Retrofit
The comprehensive retrofit project of 220 kV substation involves a wide range of scope. The newly promoted line protection,bus differential failure protection,comprehensive automation control system (NCS)and electronic five prevention system,stability device,phasor measurement system (PMU),remote signaling and telemetry system (RTU) are closely related to important equipment such as old bus differential failure protection,phase Ⅱ bus differential failure protection,segmented switch,etc. During the construction process,it is highly prone to relay protection"three errors"accidents,and serious consequences such as improper action or inaction of protective relays and misoperations may also oc-cur due to incomplete interlocking and control circuits. How to rationally perform risk identification and safety analysis of relay protection work,take corresponding safety measures and preventive measures,and ensure the safe construction of relay protection during renovation thus becomes a top priority problem. This article conducts a risk analysis and construc-tion summary of relay protection safety construction in the retrofit of 220 kV substations by analyzing the experience of formulating various measures and plans and the construction management experience in practice.
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