Digital protective relay

A digital protective relay (DPR) is an electronic device that includes an analog input block with internal current and voltage transformers, input filters such as anti-aliasing filters and sample-and-hold circuits, a multiplexor, an analog-to-digital converter, a microprocessor, various memory devices, a logic (digital) inputs block, and a relay-controlled output block. Its purpose is to protect electrical systems by detecting and isolating faults, and it operates using digital technology.From: Digital Protective Relays [2017]

Design and Functional Modules of Digital Protective Relays

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Published in Vladimir Gurevich, Digital Protective Relays, 2017

Vladimir Gurevich

A digital protective relay (DPR) consists of the following basic materials: an analog input block (internal current and voltage transformers), input filters (anti-aliasing filters and sample-and-hold circuits), a multiplexor, an analog-to-digital converter, a microprocessor, different memory devices, a logic (digital) inputs block, and a relay-controlled output block (see Figure 2.1).

Wide area monitoring for energy system: a review

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Published in International Journal of Ambient Energy, 2019

A. Nageswara Rao, P. Vijaya Priya, M. Kowsalya, R. Gnanadass

The operative data comprise the measurements of voltage, current, phasor and position of breaker promptly done by the intelligent devices. The measured data are communicated unceasingly to control centre through the systems of communication. Sporadically, they possibly will be used in the local vicinity aimed at decision making. On the former side, the non-operative data principally entail the records of manifold events – for instance, sequences of faults, power oscillations, and instabilities. Archetypally, the non-operative data are off-line, which are communicated to the central control either in the quantified time breaks or by the requisition of the system machinist. Supervisory control and data acquisition (SCADA) and synchronised phasor measurement system (SPMS) are twofold operative data resources that will be studied. On the other hand, digital fault recorder (DFR), digital protective relay (DPR) and circuit breaker monitor (CBM) will be explored as non-operative data resources.

Digital protective relay

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Design and Functional Modules of Digital Protective Relays

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