|
所在平台: Udemy |
课程主页: https://www.udemy.com/course/transformer-differential-protection-calculations-sel-787/
课程评论：没有评论
课程名称：变压器差动保护计算 SEL 787 课程概述：本课程由一位拥有21年以上运营与维护、安装、测试、项目管理、咨询、监理、变电站自动化、SCADA和调试经验的培训师主讲。培训师的背景涵盖了发电厂、高压变电站和高压直流输电 (HVDC) 安装，曾在西门子沙特阿拉伯等著名组织工作，参与了巴基斯坦和沙特阿拉伯的20多个高压变电站项目。他在保护系统、变电站自动化系统、发电系统设计、测试与调试、高压开关设备、保护继电器与控制方案方面具有广泛的专业知识，并有带领测试与调试团队实施工业客户电力基础设施项目的成功经验，包括钢铁和石化行业。 课程内容： 本课程专注于SEL-787继电器的保护元件设置，具体包括三个差动元件（87R-1，87R-2和87R-3），它们基于输入绕组的电流计算操作（IOP）和限制（IRT）量。您将学习如何设置单坡度和双坡度变量百分比差动特性，并了解电流的选择和限制设置。课程还会涵盖： - 变压器海量评级和TAP缩放的概念 - 26MVA变压器的设置计算，包括冷却类型、矢量组、额定电压和满载电流数据 - 保护设置计算，短路功率和电流的关系 - 短路MVA与变压器阻抗百分比的关系 - 相位角误差及其补偿 - 操作和限制电流的计算 - TAPN和相位角补偿设置 - 斜率1和2的计算 - 谐波阻塞计算 通过本课程，学员将掌握变压器差动保护的理论和实务，并能进行实际的计算与设置。
Dear All,Trainer Introduction:Your trainer brings over 21 years of experience in operation & maintenance, erection, testing, project management, consultancy, supervision, substation automation, SCADA, and commissioning. With a background spanning power plants, high voltage substations, and HVDC installations, he has worked with renowned organizations such as Siemens Saudi Arabia. He has been involved in over 20 high-voltage substation projects across Pakistan and Saudi Arabia.His expertise encompasses a wide range of areas including protection systems, substation automation systems, design, testing, and commissioning of power generation systems, high voltage switchgear, protection relays, and control schemes. He has a proven track record of leading testing and commissioning teams for implementing electrical infrastructure projects for industrial clients, including steel and petrochemical industries.Protection Element Setting:Functional Scope:The SEL-787 has three differential elements (87R-1, 87R-2, and 87R-3).These elements employOperate (IOP) and Restraint (IRT) quantities that therelay calculates from the winding input currents.Figure shows the relay characteristic. You can set the characteristic as either a single-slope, percentage differential characteristic or as a dual-slope, variable-percentage differential characteristic. Tripping occurs if the Operate quantity is greater than the curve value for the particular restraint quantity.A minimum pick up level for the Operate quantity must also be satisfied.The four settings that define the characteristic are:O87P = minimum IOP level required for operationSLP1 = initial slope, beginning at the origin and intersecting O87P atIRT = O87P • 100/SLP1IRS1 = limit of IRT for SLP1 operation; intersection where SLP2 beginsSLP2 = second slope must be greater than or equal to SLP1The relay (SEL-787) use the transformer MVA rating as a common reference point, TAP scaling converts all secondary currents entering the relay from the two windings to per unit values, thus changing the ampere valuesinto dimensionless multiples of TAP. Throughout the text, the term "TAP" refers to the per-unit value common toboth windings. This method ensures that, for full-load through-current conditions, all incoming current multiples oftap sum to 1.0 and all outgoing current multiples of tap sum to -1.0, with a reference direction into the transformer windings.In this course, we will perform the setting calculation of 26MVA transformer with following data:Type of cooling: ONAN / ONAFVector Group: Dyn11Rated Voltage HV V: 132000Rated Voltage LV V: 12000Full Load current HV A: 87.48 / 113.72Full Load current LV A: 1004.12 / 1305.35Rated Power MVA: 20 / 26% impedance at normal tap (12 no.): 15.35% / 19.95 %Type of tap changer: On loadVoltage at maximum tap V: 151800Voltage at minimum tap V: 112200Further we will calculate: Protection Settings Calculations for Power TransformersFull load amperesShort circuit MVAShort circuit current at HV & LV sidesrelationship between short circuit MVA and percentage impedance of transformerMagnitude and phase angle error and its compensationCT error and its compensationOperating and restraining currentsPickup current calculationsTAPN calculationsPhase angle compensation settingsSlope 1 & 2 calculationsHarmonics blocking calculations.Best Regards
