[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-663430-105":3,"detail-sidebar-cat-0-en-105":80,"doc-detail-663430-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":73,"head_meta":75,"extra_data":77,"updated_unix":79},105,"en","single-line-drawing-for-dgs-with-primary-line-protection-technical-specifications","Single Line Drawing for DG's with Primary Line Protection - Technical Specifications","","This document provides detailed technical specifications and a single-line schematic for the protection of Distributed Generation (DG) facilities. It outlines essential protective relaying functions, including synchronization checks, under-voltage and over-voltage protection, directional power monitoring, and negative sequence protection. The content focuses on both required and recommended protection strategies for generators, addressing bus and transformer differential protection, and defining the criteria for isolation transformer requirements in accordance with utility interconnection standards.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/single-line-drawing-for-dgs-with-primary-line-protection-technical-specifications/663430/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/single-line-drawing-for-dgs-with-primary-line-protection-technical-specifications/663430.png","ImageObject",300,407,{"name":42,"@type":43},"Muffet","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":52,"interactionType":53,"userInteractionCount":26},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"What are the primary protective functions required for the DG facility?","Question",{"text":62,"@type":63},"The required functions include synch check (25), under voltage (27), directional power (32), negative sequence (46), over/under voltage (59), over/under frequency (81), bus differential (87B), and transformer differential (87T) among others.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"When might an isolation transformer be unnecessary in this system?",{"text":67,"@type":63},"An isolation transformer may not be required if harmonic requirements are met and tested, if neutral reactors provide an effectively grounded system, and if faults on the LIPA system can be selectively detected.",{"name":69,"@type":60,"acceptedAnswer":70},"What is the recommended protection for the generator?",{"text":71,"@type":63},"Recommended protection includes over/under voltage, over/under frequency, negative sequence, reverse power, voltage restraint overcurrent, and loss of excitation, with ground and differential protection suggested as additional measures.","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},663430,1793227701,{"code":4,"msg":81,"data":82},"success",[83,87,91,95,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},"Story & 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CHECKUNDER VOLTAGEDIRECTIONAL POWER46NEG SEQUENCE □C50/51V50/51N59□VER VOLTAGE67DIRECTIONAL DC  \n252732  \n□VER/UNDER FREQ87BBUS DIFFERENTIAL87TTRANS DIFFERENTIAL50/51INST,&TIME D.C.GENERATOR PROTECTIONREQUIRED  \n□VER/UNDER VOLTAGE  \n□VER/UNDER FREQUENCYNEGATIVE SEQUENCEREVERSE POWERLOSS CF EXCITATIONRECOMMENDEDGROUND PROTECTIONDIFFERENTIAL PROTECTION  \nTO LDADSHIGH IMPEDANCE GROUNDEDGENERATORS WITH GENERATORPROTECTIVE RELAYING  \n# SAMPLE DRAWING\n\nSINGLE LINE DRAWING FOR DG'S","cbCaijQEw557idrA","https://ap.wps.com/l/cbCaijQEw557idrA","pdf",258338,"English","# Required Protection Functions\n## Generator Protection Requirements\n# Interconnection and System Design\n## Isolation Transformer Criteria","[{\"question\":\"What are the primary protective functions required for the DG facility?\",\"answer\":\"The required functions include synch check (25), under voltage (27), directional power (32), negative sequence (46), over/under voltage (59), over/under frequency (81), bus differential (87B), and transformer differential (87T) among others.\"},{\"question\":\"When might an isolation transformer be unnecessary in this system?\",\"answer\":\"An isolation transformer may not be required if harmonic requirements are met and tested, if neutral reactors provide an effectively grounded system, and if faults on the LIPA system can be selectively detected.\"},{\"question\":\"What is the recommended protection for the generator?\",\"answer\":\"Recommended protection includes over/under voltage, over/under frequency, negative sequence, reverse power, voltage restraint overcurrent, and loss of excitation, with ground and differential protection suggested as additional measures.\"}]","Single Line Drawing for DG's with Primary Line Protection - Technical Specifications | PDF"]