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DETERMINISTIC TRIPPING FOR PROTECTION APPLICATIONS AND APPARATUSES

IP.com Disclosure Number: IPCOM000246878D
Publication Date: 2016-Jul-11
Document File: 6 page(s) / 197K

Publishing Venue

The IP.com Prior Art Database

Related People

Maik Seewald: AUTHOR

Abstract

Presented herein are techniques to protect assets in the power grid (primary equipment) from damage caused by abnormal conditions. More specifically, the techniques provided herein facilitate deterministic networking based on Time Sensitive Networking (TSN) for critical teleprotection functions and applications that operate in electrical substations and/or between substations and remote installations of protection relays/intelligent electronic devices (IED's). The techniques do not require application specific implementations to achieve deterministic behavior of devices operating in this environment and, thus, allow an integrated approach for engineering and configuring these installations.

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DETERMINISTIC TRIPPING FOR PROTECTION APPLICATIONS AND APPARATUSES

 AUTHOR: Maik Seewald

CISCO SYSTEMS, INC.

ABSTRACT

    Presented herein are techniques to protect assets in the power grid (primary equipment) from damage caused by abnormal conditions. More specifically, the techniques provided herein facilitate deterministic networking based on Time Sensitive Networking (TSN) for critical teleprotection functions and applications that operate in electrical substations and/or between substations and remote installations of protection relays/intelligent electronic devices (IED's). The techniques do not require application specific implementations to achieve deterministic behavior of devices operating in this environment and, thus, allow an integrated approach for engineering and configuring these installations.

DETAILED DESCRIPTION

    Within the electrical power grid, teleprotection schemes protect primary equipment operating in power grid installations from severe faults, such as abnormal voltage, current, and/or frequency conditions. If a severe fault is detected, circuit breakers are opened within a defined fault clearing time in order to limit the impact of the fault on equipment. Rigid timing and latency symmetry are required to support these schemes. The communication network must meet these requirements while also providing network redundancy mechanisms that achieve high availability.

    The techniques provided herein provide a deterministic network based on time- scheduling mechanisms that utilize a predictable communication architecture, called Time Sensitive Networking (TSN), in order to provide a platform for teleprotection applications that satisfies the aforementioned requirements. TSN guarantees latency,

Copyright 2016 Cisco Systems, Inc.

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jitter, and zero congestion loss and, technically, requires that all nodes of the network are time synchronized. TSN provides two key-functions that solve teleprotection problems while also fulfilling the strict requirements of teleprotection schemes:

• Fault identification: sensing of abnormal voltage, current or frequency conditions in the power grid; protecting electrical equipment from damage caused by overload or short circuit

• Fault clearing: opening a circuit breaker, an automatically operated electrical switch

Protection relays and/or intelligent electronic devices (IED) are typically responsible for this fault identification and clearing.

Solution Overview

    Protection systems typically include protection devices (e.g., digital protection relays or IEDs) that are connected to each other over a communication network. The protection devices are often partitioned into two main components: (1) a logic and application unit; and (2) a communication module. The techniques provided herein leverage deterministic network technologies in these devices, as well as deterministic network technologies in network gear, such as switches, to protect assets in the power grid (primary e...