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ǰλãҳ > Ѷ > ֱҵ > SEL-321̬붯̬
SEL-321̬붯̬
ʱ䣺2020-07-15 www.sushi100.cn

:ꡡ÷𻪡ȡƽ

Schweitzerʵ(SEL)΢·ӻ˴ֳĸ迹ĿԪ(ֳĸ迹ĿԪף12ݼSELṩSEL-321/321-1ֲָ)ڸ迹ƽϴƹʱʵ迹Z2=U2/I2(ʽU2I2Ϊ̵Ĺϵѹĸ)ĵz2=Z2Fb(ʽz2Ϊ迹·迹DZĿĵͶӰZ2FbΪSEL̵ƾݷZ2ƽϳֵ)²ʱ(z2Z2Fb)бΪĿĹz2=Z2Rb(ʽZ2RbΪSEL̵ƾݷZ2ƽϳķֵ)ϲʱ(z2Z2Rb)бΪĿĹฺĿԪֵͶװеʵϵͳ迹йڶԲฺĿԪıӻм̵ʵʱӦעʵ鷽ʽü鴫ͳ̵ʵ鷽ʽܻһЩ

1ӻ̬ʵ鷽ʽ

SEL-321΢·ӻ估ӵؾӻĿĹӻ͹϶λĹԲıĿԪ˴ֳĸĿԪӻıĿ迹Ԫ븺ĿԪϵһڶԸñӻԪвʱòһĿ迹ӻķʽעʵĵѹķֵλӻװʵϵͳʱ̫ԶͿɾԪھضֵĸĿԪû𶯶ʹӻû

ijվۺԶϵͳ110kV·SEL-321·ȫΪ3.8kmϵͳ򻯵ͼͼ1ʾ

ͼGRΪӻԲϵͳԴGSΪӻ󷽾110kV/35kVѹӵ1СˮӻװΪ3ӻ4ӻӻĸĿԪֵΪZ2ֵZ2F=-12.5Z2ֵZ2R=0.5ӻΪ1ζֵZzd1=0.072ζֵZzd2=0.333ζֵZzd3=2.8·迹ǦL=70Ŀ迹Բͼ2ʾ110kV·ӻSEL-321ӻĿ迹ԲMHO

迹迹ƽϻʽʾ迹Բɸ迹ֵZzd迹Բҹ
к蹵Բ

ʽСU迹̵ĸߵѹ
Zzd迹̵迹ֵ
I迹̵ĵ
U-Zzd.I迹̵ֳѹ
Zf迹̵Ĺ迹

ʵOMICRONCMC-156̵ӻCMC-156ṩ迹ƽ϶ԾӻԵ2ֻʽһǺ㶨һǺ㶨Դ迹

ӻĿ迹ԲԪIJһɲú㶨ģL2-L3·迹Բ蹵(൱迹Բ蹵ÿһǶֵ)Էʽģ·ǰΪ״̬ϲԵĶ·ҹСһ(ΪԵItestIL2=IL3=Itest)ϵѹ(L2L3ѹUL2-L3)λΪ-90(L1ѹUL1λΪ0)L2L3λIL2IL3ɹ迹Zf迹ǦȾIL2=-90-IL3=90 ϵѹUL2-L3ҹСɶ·迹ZfҹС϶UL2-L3=2.ItestZf

ú㶨̶Itest=3.0ASEL-321ӻĿ迹ԻõijЧǣ·迹迹迹Բҹ(·迹ǦL)ʱӻ迹Բĺ蹵ͼ2붯迹ԲϺǺ·迹迹ƫҹʱӻԤڵIJ迹Բ蹵û·迹Zf=2.3540㦸·Ӧڵ3迹ԲӻZf=0.210㦸ʱӻ

ԵʵӵZf=2.3540㦸ʱIL2=-IL3=3.0-130AUL2-L3=14.1-90VʱϵԴGSϵͳ迹ZS=14.31740㦸SEL-321ƽϳֵ(ף12ݼSELṩSEL-321/321-1ֲָ)Ϊ

Z2Fb=0.75Z2F-0.25Z2S=-12.579.

ʽСZ2SϵԴϵͳ迹
SEL-321ƽϳ迹迹DZĿĵͶӰҹСΪ

z2=ReZ2S.170=-12.399.

z2Z2FbĿбԪδɱӻܳһZf=0.210㦸ʱIL2=-IL3=3.0-100AUL2-L3=1.2-90VZS=16.46710㦸ʱУ

Z2Fb=0.75Z2F-0.25Z2S=-13.117
z2=ReZ2S.170=-8.233.

һz2Z2FbĿԪδʹӻܳ

Ҫú㶨⵽SEL-321ͼ2ʾ·ʱ迹ֻƽ·ķʽڴʱѹ޸SEL-321ıĿԪ迹ĿԪϵͳԴ迹޹ͼ3Ϊú㶨ģ·ʵõĸ·ӻSEL-321ӻ3εľ̬

2ӻ̬ʵ鷽ʽ

ú㶨ʵ鷽ʽܼSEL-321·ʱͼ2ʾ迹CMC-156ṩ迹ƽϵһֻԷʽ㶨Դ迹ԶģijһضԴ迹(ʵ趨)ڷ·迹ʱӻװط⵽ĵ͵ѹӦҹСλƾԴ迹͹迹ƽϻ֤˱ӻԵZSϵͳ֪㸺ĿԪĶԱӻ迹вҲӽӻʵе

ú㶨Դ迹õ迹Ѳͼ2ʾ迹ԲSEL-321ӻ˳ʱ򼫻ѹͼ2ʾ迹ԲֻDZĿ迹ӻԪ̬ڼѹӻ迹Ԫ迹ƽϱΪʽʾԲ

ʽСU0迹̵ļ伫ѹ

·ʱЧҹϵͳĵѹΪEЧϵͳ迹ΪZS·ǰU0=EϺ̵װĸߵѹUZf.I

E=U ZS.I=(Zf ZS).Iɽѹӻ迹ԪԲıʽΪӻĶ蹵ΪʾԲͼ4(a)ʾΪ·ʱȫ伫ѹµıĿ迹ԪĶ̬

·ʱE=U0U=Zf.IE=U (ZL ZR).I=(Zf ZL ZR).Iɽѹӻ迹ԪԲıʽΪ

ӻ蹵ΪʾԲͼ4(b)ʾΪ·ʱȫ伫ѹµıĿ迹ԪĶ̬

±Ŀ迹ԪĶ̬

Ŀ迹ԲԪĶ̬ѹҼС˴ֳݿͶ;ɵԹ迹ͱĿжϵӰиõ

3ʵ鷽ʽͬӻ̬Ͷ̬Ĺϵ

ڼѹĿ迹ԲԪԹϵķӦǶֻ̬·᳤ʱѹʧúĿ迹ԲԪԹϵķӦűΪ̬ڹϷĿ迹ԲԪԹϵķӦǶ̬ĩΪʲôԴͳӻӻMHOĿ迹ԲԪú㶨вԿɻþ̬?ʵSEL-321ûиĿԪӰ(ĿԪֵĿԪɶʱ)Ҳɲú㶨Ե·ʱľ̬

㶨õľ̬ͱӻԼĶ̬ʲôϵ?ǰ㶨ģʱģL2-L3·ϲԵĶ·ҹСһ(IL2=IL3=Itest)ϵѹ(UL2-L3)λ-90(L1ѹUL1λΪολ0)ǰΪ״̬UL2-L3λΪ-90Ҳ˵ѹU0ϺѹUͬλ̬90㣼argͶ̬90㣼arg(ʵDzһ֪ú㶨Դ迹ģƽ·ʱǰѹλıú㶨Դ迹ƽϲԷʽõıӻҲǾ̬Բ

ڼѹʱĿ迹ԲԪԹϵĶӳǶ̬ĩú㶨Իõľ̬Ķ蹵һһDZӻ1̬Ķ蹵ϵĵǰSEL-321ú㶨IL2=IL3=Itest=3.0AģL2-L3·Եõ3αӻڹ迹Ϊ40ĿϵĶ蹵ΪZf=2.4240ӲԵѹƽϿɵʱZS=14.31740迹ƽZzd3-ZSΪֱԲ(ͼ5ʾ)ZfԭOZzd3ΪֱԲϵĵɼζ֪OZfZzd3=90ĩСZSZfZzd3=90ɼζ֪Zf-ZSZzd3ΪֱԲϵĵľ̬蹵ʵǸıԴ迹迹Ķ̬ӦԴ迹DZĿϵĺ蹵ľ

4

a)SELֳĸĿԪϵͳ迹нܹϵڽӻʱѹҹСλӦijһϵͳ迹(Դ迹·迹迹)·ܱ֤ĿԪĶӰӻԪ

b)ھм伫ѹľӻOMICRONCMC-156̵ӻ(в칦ܵıӻ)ú㶨IJԷʽֻܲԾӻľ̬ú㶨Դ迹IJԷʽԲԵþӻԲϵĶ̬

c)ϵĺ㶨IJԻõľӻ̬蹵ʵǸıԴ迹õĶ̬ʵԴ迹迹DZĿϵĺ蹵ľ

ο

1RobewrtaJ,GuzmanA.DirectionalElementDesignandEvaluationZ.SchweitzerEngineeringLaboratories.49thAnnualGeorgiaTechProtectiveRelayingGonference,Atlanta,1995

2SchweitzerEORobewrtaJ.DistanceRelayElementDesignZ.SchweitzerEngineeringLaboratories.46thAnnualConferenceforProtectiveRelayingEngineers,TexasA&MUniversity,Texas,1993

3ʯ.ѹ̵ӻԭ뼼.2M.й1995

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