IEEE C37.235-2007 pdf free.IEEE Guide for the Application of Rogowski Coils Used for Protective Relaying Purposes.
This guide establishes criteria and requirements for application of Rogowski coils (RUs) (air-core current sensors) used for protective relaying in electric power systems. The selection and application of RCs for the more common protection schemes arc addressed.
1.2 Purpose
This document provides a guide for application of Rogowski coils used for protective relaying in electric power systems. It is intended to assist the relay application engineer in the correct selection and application of RCs for protective relaying purposes. It provides requirements relevant to the performance, operation. testing, and maintenance of Rogowski coil-based current sensors. This guide applies to all types of Rogowski coils used for protective relaying purposes.
1.3 Protective relaying principles using Rogowski coils
Part a) of Figure I shows protective relaying principles using a Rogowski coil directly interfaced to an intelligent electronic device (lED), and part b) of Figure 1 shows solutions described in IEC 60044-8’ for electronic current transformers (ECTs). Figure 1 is explained in 5.7.IEEE C37.235 pdf download.