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MODEL SETTING CALCULATIONS FOR TYPICAL IEDs …

MODEL SETTING CALCULATIONS FOR TYPICAL IEDs LINE protection SETTING GUIDE LINES protection SYSTEM AUDIT check LIST recommendations FOR protection management SUB-COMMITTEE ON RELAY/ protection UNDER TASK FORCE FOR POWER SYSTEM ANALYSIS UNDER CONTIGENCIES New Delhi March 2014 protection subcommittee report Preamble As a follow up of one of the recommendations of the Enquiry Committee headed by Chairman, CEA on grid disturbances that took place in Indian grid on 30th and 31st July 2012, Ministry of Power constituted a Task Force on Power System Analysis under Contingencies in December 2012. The Terms of Reference of Task Force broadly cover analysis of the network behaviour under normal conditions and contingencies, review of the philosophy of operation of protection relays, review of islanding schemes and technological options to improve the performance of the grid.

model setting calculations for typical ieds line protection setting guide lines protection system audit check list recommendations for protection management

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Transcription of MODEL SETTING CALCULATIONS FOR TYPICAL IEDs …

1 MODEL SETTING CALCULATIONS FOR TYPICAL IEDs LINE protection SETTING GUIDE LINES protection SYSTEM AUDIT check LIST recommendations FOR protection management SUB-COMMITTEE ON RELAY/ protection UNDER TASK FORCE FOR POWER SYSTEM ANALYSIS UNDER CONTIGENCIES New Delhi March 2014 protection subcommittee report Preamble As a follow up of one of the recommendations of the Enquiry Committee headed by Chairman, CEA on grid disturbances that took place in Indian grid on 30th and 31st July 2012, Ministry of Power constituted a Task Force on Power System Analysis under Contingencies in December 2012. The Terms of Reference of Task Force broadly cover analysis of the network behaviour under normal conditions and contingencies, review of the philosophy of operation of protection relays, review of islanding schemes and technological options to improve the performance of the grid.

2 Apart from the main Task Force two more sub-committees were constituted. One for system studies for July-September 2013 conditions and another for examining philosophy of relay and protection coordination. The tasks assigned to the protection sub-committee were to review the protection SETTING philosophy (including load encroachment, power swing blocking, out of step protection , back-up protections) for protection relays installed at 765kV, 400kV, 220kV (132kV in NER) transmission system and prepare procedure for protection audit. This was submitted to the Task Force on Further one more task assigned to the protection sub-committee was to prepare MODEL SETTING CALCULATIONS for TYPICAL IEDs used in protection of 400kV line, transformer, reactor and busbar. This document gives the MODEL SETTING CALCULATIONS , line protection SETTING guide lines, protection system audit check lists , recommendations for protection system management and some details connected with protection audit.

3 protection subcommittee report Acknowledgement The protection sub-committee thanks members of Task Force for Power System Analysis under Contingencies for all the support and encouragement. Further the protection sub-committee acknowledges the contribution from Mr Rajil Srivastava, Mr Abhay Kumar, Mr Kailash Rathore of Power Grid, Mr Shaik Nadeem of ABB and Mr Vijaya Kumar of PRDC to the work carried out by the sub - committee. Sub-committee Convener Pandey, Power Grid Members P. P. Francis, NTPC Patki, Tata Power R. H. Satpute, MSETCL Nagaraja, PRDC Bapuji Palki, ABB Vikas Saxena, Jindal Power protection subcommittee report LIST OF CONTENTS Preamble Section Description Pages 1 : Introduction 1-3 2 : MODEL SETTING CALCULATIONS -Line 1-149 3 : MODEL SETTING CALCULATIONS -Transformer 1-132 4 : MODEL SETTING CALCULATIONS - Shunt Reactor 1-120 5 : MODEL SETTING CALCULATIONS - Busbar 1-15 6 : Relay SETTING guide lines for transmission lines 1-19 7 : recommendations for protection system management 1-5 8 : check list for audit of fault clearance system 1-16 9.

4 Details of protection audit 1-5 protection subcommittee report - 1 - MODEL SETTING calculation DOCUMENTS FOR TYPICAL IEDs USED FOR THE protection OF DIFFERENT POWER SYSTEM ELEMENTS IN 220kV, 400kV AND 765 kV SUBSTATIONS INTRODUCTION In addition to SETTING criteria guide lines prepared by Subcommittee on relay/ protection under Task Force for Power System Analysis under Contingencies for 220kV, 400kV and 765kV transmission lines, the Subcommittee has prepared MODEL SETTING calculation documents for IEDs used for protection of following elements. 400kV Transmission line 400/220/33kV Auto Transformer 400kV Shunt Reactor 400kV Bus Bar While guide lines as finalized by the Subcommittee have been used for the SETTING calculation document on transmission lines, for other power system elements like transformer, shunt reactor and bus bar, guide lines as given in CBIP documents and manufacturer's manuals have been used.

5 The documents presented should serve as a MODEL to various utilities in preparing similar documents for different power system elements that are used in 220kV, 400kV and 765kV EHV and UHV transmission systems. The documents are prepared to meet following expectations given in the protection subcommittee report. The numerical terminals referred as IED (Intelligent electronic device) contain apart from main protection functions several other protection & supervision functions which may or may not be used for a particular application. Many of these functions are having default settings which may not be suitable and may lead to mal-operations. Thus, it is important that the recommended SETTING document should contain all the settings for all functions that are used and indicate clearly the functions not used (to be Blocked / Disabled).

6 This shall be followed not only for Line protection IEDs but also for other IEDs like Generator, Transformer, Reactor, Bus bar protection protection subcommittee report - 2 - and Control functions. It is also recommended that graphical representation of distance relay zones on R-X plane including phase selection, load encroachment & power swing characteristics should be done showing exact SETTING calculated. Each of these documents has following main sections: 1. BASIC SYSTEM PARAMETERS: This section contains all the system related information including single line diagram that will be required in carrying out the SETTING CALCULATIONS and thus form an important part. This information is unique to each element like line, transformer, reactor or busbar. This helps not only in carrying out the SETTING CALCULATIONS ; it also helps in future, if there is a need to revisit this data.

7 2. TERMINAL IDENTIFICATION AND LIST OF FUNCTIONS: This section contains brief details of the IED and lists all the functions that are available in the IED and clearly identifies the ones which are activated and those that are required to be set. Thus this section serves as a checklist of all the functions used and gives a quick overview of functions that needs to be set. 3. SETTING CALCULATIONS AND RECOMMENDED SETTINGS: This section contains subsections viz., SETTING guide lines, SETTING CALCULATIONS and Recommended settings for each function. SETTING guidelines: This subsection contains guide lines for each of the parameter to be set for the function. The guidelines are taken from the report prepared by protection subcommittee and CBIP guide lines mentioned in the report. In addition to the main settings the IED also has various other settings that need to be set.

8 Guide lines for these settings are taken mainly from manufacturer's user manuals and these are also given here in brief. In such instances, where the SETTING is straight forward and does not involve any CALCULATIONS , the recommended value are given and where applicable the reasoning for the adopted SETTING is given. SETTING calculation based on the relay type, relay function is a major concern for utilities and understanding each SETTING and basis for SETTING helps in arriving at right settings. Further the guide lines help not only in carrying out the SETTING CALCULATIONS , but also help in future, if there is a need to revisit the settings to take corrective actions in case of any mal-operations. SETTING CALCULATIONS : This subsection contains details of CALCULATIONS using system parameters for those parameters that need CALCULATIONS .

9 Other parameters that do not require any CALCULATIONS are not covered here. Making SETTING CALCULATIONS after understanding the power system implications and as per SETTING guidelines helps not only in arriving at the right settings but also helps in future, if there is a need to revisit them to take corrective action in case of any protection subcommittee report - 3 - mal-operations (if excel based sheets with macros are used for SETTING CALCULATIONS , they should be used cautiously in a transparent manner and explained the reasoning associated with macros / formulae). Recommended settings: This subsection details recommended SETTING list with settings for all the parameters. Settings given in this section need to be used by site engineer for SETTING the IED. It is recommended that these MODEL SETTING CALCULATIONS are reviewed periodically to take care of any changes in manufacturer's design, use of simulation tools, RTDS, or better understanding of settings and guidelines etc.

10 It is also recommended that SETTING calculation documents are prepared for IEDs of different manufacturers that are used in the system. Disclaimer: The MODEL SETTING CALCULATIONS and recommended settings presented in this document are for the specific case considered here. Further, the make of the relay considered is also for illustration purpose only. In the settings which do not require any CALCULATIONS based on network data, few of the settings may need review for other practical cases. For settings that require CALCULATIONS , power system network data pertaining to respective cases is to be considered. However, the methodology adopted in this example shall be used for calculating the line and other equipment protection relay settings and arriving at list of recommended settings. MODEL SETTING calculation DOCUMENT FOR A TYPICAL IED USED FOR TRANSMISSION LINE protection MODEL SETTING calculation document for Transmission Line 2 TABLE OF CONTENTS TABLE OF CONTENTS.


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