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[]1 ϸĿǰվרõԪ΢װȡ˴ͳ۹ܱͼ̵ܹʵֶιѹȱһ봫ͳ۹ܱɻ̶ȼ̶ȸڱ

1 ϸ

ĿǰվרõԪ΢װȡ˴ͳ۹ܱͼ̵ܹʵֶιѹȱһ봫ͳ۹ܱɻ̶ȼ̶ȸڱйŶԵרõԪ΢װóĬϱ֪ܿرǵ鵥Ԫ΢Զ󱸱Χͷӳ͸ڱϲѡҪҹ˾һ鵥Ԫ΢ı

2011ijij35kVڱ伯вͶ10kVͶһڶͶר΢װ÷“ζIb=2.50A”źڶբ漴բ鿴װöֵһ5A0s;1.5A,0.5s;ѹ20V,0.5sºǶԵר΢ֵ½˼ֳբݽзҳ˴˴բԭ

2 ԭ

2.1 ṹ

ĿǰڶԲװõĵ̨ڲֱͨʽ˿΢۶΢˿΢Ŀǰҹ˾۶΢˿΢ʽGB50227-2008װƹ淶ҪҲòͬıʽȱ۶΢ڹСϱ㷺ŵǣʱֱܹʱ۶۶ڸ۶Ϊ·ܹ˷˿ڵڲ֮·͵׹ԼΪڲԪη·(˿ʧ)ĺ󱸱붯ʱʷʱڵ·ʱѸٱг˿΢ʽǰҪǽڵͼʽڹڷչĴ̨װ˿ڲ۶ṹһװڲռIJɱҼҪߵڼЭûȷ涨һ㲻ô˽ṹڲû˿ֲװ۶΢ʽȽӱɿѡԿ۶΢ŵǽ˳ɱ

2.2 зϵ𼰶Ӧʩ

бվͨ¼

2.2.1 ͵֮ܿ߹;

2.2.2 ڲϼ߶·;

2.2.3 ijһϵгʣĹѹ;

2.2.4 ӵĸʧѹ;

2.2.5 ѹ;

GB/T 14285-2006̵ͰȫԶװü̡涨3kVϵIJйӦֱװ

2.2.1ϲȡڵܿرװʱٶα͹;2.2.2ϲõ΢۶;2.2.3ϲòƽѹԭϺ仯ڲص֮ĵƽγɵĵѹɿǵѹֱŵǣϵͳӵعϺϵͳѹƽӰгӰȸʹõ豸װС鳣õһֱʽȱǣŵȦܲ͵Դ಻ƽⶼʼƽѹӰΪ˱բ·բͬⲿϵʱһΪ0.11.0s;2.2.4ϲʧѹԭһǵָͣ͵ɵɺբʹѹ;ǵվָͣ͵ɱѹբѹĺբӿԼѹʹ߾ܵ˺;2.2.5ϲùѹ˵ѹʱ䳬1.1ѹԭ

2.3 ΢

Ŀǰҹ˾վеIJΪνڲСԪȲ˿,ⲿ߰޲Ƿװרǫ̃۶ʽվLDBH201΢Ԫװרǫ̃۶;һվDSB2030͵΢Ԫδװе̨۶ʱͬҲƷҪͬͬʱձҪǷװרǫ̃۶㹫ʽҲֱͬ˵ԭ򼰽

2.3.1 DSB2030΢Ԫ㣺

110kV޼ұõ΢δװ赥̨۶ͺΪDS5-12/3000-3NͶΪ1:2:3ν1

 

 

ͼ1 ޵̨۶

2.3.1.1 ѹ

ա3110kV̵װ̡涨ӦݵIJƽѹIJԳʱڵIJƽѹʱӦͱֵ߽ϸߵͬʱӦ㳧Ҫ

һ͵ڶ鿪Ƕѹֵ

 

 

ʽУUDZ:ѹֵ

U——————ŵȦĶѹ57.7V;(ʵʷŵȦȣ10000/100)

N——————ÿݴΪ4

M——————ÿݲֻΪ2

Ҫùʽ(1)ֵӦ

UDZ=5.77V≈5V

ѹֵ5VװóѾ̻Ϊ0.2s˶ʱΪ0s

ѹ

 

 

U——————ŵȦĶѹ57.7V(ʵʷŵȦȣ10000/100)

N——————ÿݴΪ4

M——————ÿݲֻΪ2

ΪȡýϸߵϵʱӦͱֵUDZ≈3.037V≈3VװóѾ̻Ϊ0.2s˶ʱΪ0s

2.3.1.2 һιֵ㣺

ձҪֱװʱٶϼճṩĶװжIDZΪAC

2.3.1.2.1 һֵ£

 

 

ACֵIAC=1.732×0.874≈1.52(A)

һʱٶ϶ֵIDZ=KKIAC=2.5×1.52≈3.8(A),ʽKKΪɿϵȡ2.5չҪʱȡ0.10.2sڸõԪװڲѾ̻Ϊ0.2sʱΪ0s

һֵIDZ=KKIAC=1.8×1.52≈2.74(A),ʽKKΪɿϵȡ1.8ʱܿʱѡҪΪ0.5s

2.3.1.2.2 ڶֵ£

 

 

ACֵIAC=1.732×1.05≈1.818(A)

ڶʱٶ϶ֵIDZ=KKIAC=2.5×1.818≈4.55(A),ʽKKΪɿϵȡ2.5չҪʱȡ0.10.2sõԪװڲѾ̻Ϊ0.2sʱΪ0s

ڶֵIDZ=KKIAC=1.8×1.818≈3.27(A),ʽKKΪɿϵȡ1.8ʱܿʱѡҪΪ0.5s

2.3.1.2.3 ֵ£

 

 

ACֵIAC=1.732×0.98≈1.70(A)

ʱٶ϶ֵIDZ=KKIAC=2.5×1.70≈4.26(A),ʽKKΪɿϵȡ2.5չҪʱȡ0.10.2sõԪװڲѾ̻Ϊ0.2sʱΪ0s

ֵIDZ=KKIAC=1.8×1.70≈3.06(A),ʽKKΪɿϵȡ1.8ʱܿʱѡҪΪ0.5s

2.3.2 LDBH201΢Ԫ㣺

35kVڱõ΢װ赥̨۶鲻ͶΪ1:2:3ν2

2

 

 

2.3.2.1 ѹ

ա3110kV̵װ̡涨ڵװרǫ̃۶俪ǵѹֵ㹫ʽ㲻ͬ

һ鿪ǵѹֵ

 

 

ʽУUDZ:ѹ

 

 

N:ÿݴΪ4

M:ÿݲֻΪ1

KLM:ϵΪ1.5

NTV:ѹΪ100(ʵʷŵȦȣ10000/100)

β̨ԪΪ0.50

ΪʱƽѹUDZ=5.77V≈5V

ѹֵ5Vʱޣ0.2s

ڶ鿪ǵѹֵ

 

 

U——————ŵȦĶѹ57.7V;(ʵʷŵȦȣ10000/100)

N——————ÿݴΪ4

M——————ÿݲֻΪ2

ΪȡýϸߵϵʱӦͱֵUDZ≈3.73V≈3V

ʱȡ0.2s

2.3.2.2 һιֵ㣺

ձҪֱװʱٶϼ

2.3.2.2.1 һֵ

ֵIE =[250/(11/√3)]/(50/5)≈1.31(A)

ʱٶ϶ֵȡIDZ=KKIAC=2.5×1.31≈3.28(A),ʽKKΪɿϵȡ2.5չҪʱȡ0.10.2sʱΪ0.2s

ֵȡIDZ=KKIAC=1.8×1.31≈2.36(A),ʽKKΪɿϵȡ1.8sʱȡ0.5s

2.3.2.2.2 ڶֵ

ֵIE =[500/(11/√3)]/(50/5)≈2.62(A)

ʱٶ϶ֵȡIDZ=KKIAC=2.5×2.62≈6.55(A),ʽKKΪɿϵȡ2.5չҪʱȡ0.10.2sʱΪ0.2s

ֵȡIDZ=KKIAC=1.8×2.62≈4.71(A),ʽKKΪɿϵȡ1.8sʱȡ0.5s

2.3.2.2.3 ֵ

ֵIE =[750/(11/√3)]/(50/5)≈3.94(A)

ʱٶ϶ֵȡIDZ=KKIAC=2.5×3.94≈9.85(A),ʽKKΪɿϵȡ2.5չҪʱȡ0.10.2sʱΪ0.2s

ֵȡIDZ=KKIAC=1.8×3.94≈7.09(A),ʽKKΪɿϵȡ1.8sʱȡ0.5s

ݶ35kVڱݶԱȿԿͶڶʱ֮Ե¹ԭǶǰװöֵΪ1.5A0.5sʵʱΪ2.50AͨڶֵӦΪ4.71AͶĶֵԶСʵʼֵ˵±΢ԪֵռͶ

3

ҵ˾Ԥѹ¹ʴʩ涨õװüʽʱӦҪ󳧼ṩ㷽ͱֵкֵ¹ӦԵмδʵȷ޹Ͷ,˵Ͷ˶ըΪ򳧷ȡ㷽޶ֵ

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