Despite of intelligence of electronic devices the process of performing an analysis of emergency events still based on manual operations.
RTSoft provides an automatic solution for utilities.
With Protection Lifecycle Suite you can trigger information for the emergency event, start data processing, identify conditions of relay protection devices (of each relay protection function)
Protection Suite aims at preliminary conclusion about the correct / failure operation of relay protection devic-es.
Our technical solutions differ from all existing at the moment realizations in the following features:
1) the use of information model to represent the initial data of the analysis in a unified, machine-understandable format: electrical topology information, characteristics of the power equipment, setting pa-rameters and algorithms of relay protection devices operation, the semantics of operational and non-operational data;
2) the use of detailed calculation models of power system and relay protection devices to perform re-lay protection performance evaluation according to the conditions of starting and tripping during fault events.
Performance evaluation and detection of possible relay failures is based on automatic comparison of infor-mation received from DPR, DFR, RTU field-devices with the expected etalon operation of relay protection obtained through digital modelling.
The main functions of Protection Suite are:
— creation of common information model of a substation or power plant that contains topology and characteristics of the primary equipment, connectivity schemas of current and voltage transformers and asso-ciated protection devices, settings and configurations of relays, semantics of their signals and recordings;
organization of fault data collection and preprocessing available for further automatic analysis;
— automatic execution of fault event identification and fault location;
automatic express fault analysis based on available preprocessed data at substation/power plant level;
automatic analysis and evaluation of starting and tripping of relay devices during fault events.
Protection Suite is implemented to collect an operational and non-operational data into a single data-base of the power object server was carried out using standard information exchange protocols for non-operational data. Data integration is accomplished through the use of common information model, which was expanded with additional semantics to describe DPR and DFR devices and identification of signals recorded in text format. Tools for editing and updating the design model of the electrical network are im-plemented in Protection Suite system, as the network topology state in the pre-fault time is determined by the actual data of circuit breakers statuses for the specified time (near the time of the analyzed fault event).
Another issue solved by Protection Suite implementation is sufficient detailing and verification of re-lay models used in modeling their operation under various disturbances: it is required to achieve correct op-eration of protection devices models in the power system model for all types of fault disturbances. To accu-rately imitate the operation of the relay protection devices, the corresponding relay protection devices mod-els contain identical composition and characteristics of measuring, starting, executive or blocking elements (current cutoff, overcurrent, distance, power direction relay, etc.), as well as the basic logic (taking into ac-count the program overlays) reproduced from the available manufactures documentation.
There are two results of evaluation of protection operation in Protection Suite in the corresponding criteria that are automatically recommended for the user: correct operation and incorrect operation (Unneces-sary; False; Failure; Admitted). The task of evaluating correct relay operation using models is solved by the following groups of functions:
10) Creation of the power system simulation model, including topology model, characteristics of primary and secondary equipment, sufficient to perform transients calculations with variety types of fault conditions.
11) Estimation of the topological state of the primary equipment in the power system based on status da-ta of switching devices in the pre-fault condition.
12) Receiving the results of fault location functions and reproducing these fault events on power system calculation model.
13) Transient calculation in the power system, taking into account all types of unbalanced conditions, all types of fault events and locations, which can be identified by the fault location function;
14) Adjustment (if necessary) of primary equipment models parameters based on actual fault data with defined fault locations to ensure that the results of the modeling comply with actual collected and processed field data.
15) The actual replica of relay configurations and their functional logic settings in their digital twins used in the modeling of power system transients especially in short circuit calculations.
16) Calculation of output analog and discrete signals from relay models for each protection functions based on the analysis of input signals connected to primary power system equipment models, and modeling of the internal functional logic of relay protection.
17) Building reference event-tree logic for relay starting and tripping conditions for a particular fault event data in the power system model — formulating requirements to protection expected operation.
18) Comparison of output signals of relay models with actual signals collected and processed from sub-station level, deviation control and alarming.
19) Determination of performance indicators of relay operation for each protection function based on the power system modelling.