SEL繼電器SEL-387A特色應(yīng)用及原理
Current Differential and Overcurrent Relay
The SEL-387A Current Differential and Overcurrent Relay offers restrained and unrestrained differential protection for two terminals. Second-, fourth-, and fifth-harmonic elements, augmented by the dc element, provide security during transformer energization and overexcitation conditions in a user-defined choice of either harmonic restraint or harmonic blocking. Overcurrent elements provide backup protection that contributes to the versatility of the SEL-387A.
sel-387a
電流差動(dòng)和過(guò)流繼電器
sel-387a差動(dòng)電流和過(guò)電流繼電器提供了內(nèi)斂與奔放兩端差動(dòng)保護(hù)。二-，第四-，和第五次諧波成分，增加了直流分量，提供安全保障，在變壓器通電和過(guò)勵(lì)磁條件下在一個(gè)用戶定義的選擇諧波或諧波閉鎖。過(guò)流元件提供備份保護(hù)，有助于對(duì)sel-387a通用性。
SEL繼電器SEL-387A特色應(yīng)用及原理
Two-Winding Current Differential Protection
The SEL-387A offers sensitive current differential protection with programmable single- or dual-slope percentage restraint, supervised by a choice of second- and fourth-harmonic blocking or restraint elements, plus fifth-harmonic and dc blocking elements for secure protection of up to two windings. Phase current harmonic blocking is set for either common or independent winding basis. Unrestrained high-set differential elements provide fast operation for high-magnitude internal faults. “Around the clock” phase angle compensation settings and automatic tap calculations simplify settings.
Individual Winding Overcurrent Protection
Torque-controllable overcurrent elements, including one instantaneous, one definite-time, and one inverse-time element each for phase, negative-sequence, and residual ground currents, provide comprehensive overcurrent protection on each winding input.
Through-Fault Recording and Monitoring
Through-fault duty is recorded and accumulated for use in SELogic control equations or manual monitoring.
Protection and Control Logic
Restricted Earth Fault (REF) logic provides sensitive grounded-wye winding ground fault protection. SELogic control equations with SELogic variables, timers, latch bits, and remote control elements are used for customizing advanced protection and control schemes. Local programmable control elements and programmable text display points provide an advanced local operator interface.
Metering and Reporting
Oscillographic event reports (up to seven 60-cycle reports), Sequential Events Recorder (SER) reporting, and accurate metering eliminate or reduce external recorder and metering requirements. Station battery voltage monitor and circuit breaker contact wear monitor provide important data for Reliability Centered Maintenance (RCM) programs. Use with the SEL-2600A RTD Module to meter temperatures from as many as 24 RTDs.
acSELerator QuickSet Software
Develop relay settings offline, program SELogic control equations, and analyze post-fault event reports.
SEL繼電器SEL-387A特色應(yīng)用及原理
SEL繼電器特色應(yīng)用
多繞組變壓器電流差動(dòng)保護(hù)與利用相結(jié)合的單多達(dá)四繞組或雙斜率比率差動(dòng)特性、過(guò)流保護(hù)和限制接地故障（REF）保護(hù)。是的sel-387a雙繞組變壓器保護(hù)的低成本的解決方案。
除了典型的變壓器保護(hù)器、發(fā)電機(jī)、大型電機(jī)、等多端電源裝置。提供備用配電母線或饋線保護(hù)與低側(cè)過(guò)電流元件。
個(gè)別繞組過(guò)電流保護(hù)提供了全面的過(guò)電流保護(hù)，每個(gè)繞組輸入轉(zhuǎn)矩可控的過(guò)電流元件。
基于狀態(tài)的維修可選的熱監(jiān)測(cè)，以激活一個(gè)控制動(dòng)作或發(fā)出報(bào)警時(shí)，變壓器有過(guò)多的絕緣老化或生命損失的危險(xiǎn)。通過(guò)故障監(jiān)測(cè)收集累積的故障數(shù)據(jù)，并安排主動(dòng)維護(hù)。