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ѹͬӵطʽ¹ѹ̽

/ԡվԱ ʱ䡿2019-11-25 290
 
ѹͬӵطʽ¹ѹ̽
1.ɽҵ޹˾ 3340002.ƽԺ 1300123.ߺԽ޹˾ ߺ241000
 
ժ  Ҫҹ3~35kVѹϵͳһԵ㲻ӵػԵ㾭ȦӵصĹ緽ʽҵʼԵ㾭СӵأԹϵͳͬĽӵطʽϵͳѹķʩԱҵļԱãҵϵͳֲͬĽӵطʽ屣ԭȱз̽ѹϵͳѹļ뾭ԣҵһЧķʩȫҵĹ
ؼʡѹ      Ȧ    ༶
 
Technical scheme analysis of over voltage protection for 3~35kV medium voltage power supply system
Xuwenmin1  Liugenping2  Guosijun3
1.Jiangxi Jinshan  Mining CO.ltd, Shangrao 334000, China2.Changchun Gold Design Institute, Changchun 130012,China ;3.Wuhu Keyue Electric Co., Ltd. Wuhu 241000, China
Abstract:In China, the 3~35kV medium voltage power supply system generally adopts the power supply mode of neutral point ungrounded or neutral grounded by arc suppression coil.In recent years, some enterprises began to use neutral grounding by small resistance.According to different grounding modes of power supply system,how to set the system over-voltage prevention measures to allow designers and technical staff to generate confusion. In this paper, three kinds of overall protection schemes are proposed for different grounding modes of power supply system. The principle, advantages and disadvantages of the three schemes are analyzed.The technical feasibility and economy of overvoltage protection scheme for medium voltage power supply system. In order to find an effective preventive measures to improve the quality of power supply.
Key words:Overvoltage;Lightning arrester;Overvoltage protector ;arc suppression coil;Resistance cabinet ;Multilevel protection
 
1
ҹ335kVѹ6kV10kV35kVѹȼӦýΪձ飬ĿǰõĹ緽ʽҪԵ㲻ӵءԵ㾭ȦӵءԵ㾭СӵַʽֽӵطʽϵͳѹķȽͨõķʽǿع߲లװĸõѹִͳıʽԼܿ·ΪͿΪװõСϵͳļ²ģʮкڿʼйõĿٷչҵ粻󣬹緽ʽҲԵı仯ҵԵ磬װն·ΪִҵԹҪҲڲߣڴ˱£װĹѹʽȻִҵԹҪ
ڴ˱£ʮڿʼڹѹƷҲڲϵطչߣ½ʽѹƹȲƷǣʹõĹУЧԣγµĹϵ㣬ԭҪƷԼѡʱǡͷҽͷʹҽšijһֹԭ򣬹ѡòƷûγIJϣҲûпǼԣ²Ʒ޷ﵽЧƷ𹩵ϵͳĹϣҵֱӻӵľʧ
ѹϵͳĹѹͬڵѹͨǵȵλԣѹòҪϣҪǺIJϣҵѹƶһı屣ĻϣѡúʵIJƷͨγһķϵҵϵͳõֽӵطʽӦ屣似ԭз֣̽ҵһЧķʩȫҵĹ
2Ե㲻ӵϵͳ
Թҵ3~35kVԵ㲻ӵعϵͳԼ硢õԣϹмˮƽγһϵͼ1ʾʵƷãã
ѹװ1+װ2+ӵװ3

10kVĸ
ѹ
ͼ1 Ե㲻ӵϵͳԭͼ
KYZK
KYD
1
2
3

2.1ѹװã

ĿΪ˷ֹ׵ԵعѹڵҵҪԵΪն·Ϊֹ繤£ϵͳѹҪвڲѹѹгѹЪԻӵعѹӵصȵȣʽԵعѹѹñѾ޷ҪԣʮкڣҵʼʽѹʽѹͨãءͬȵıãʵȫԵıʹõ豸İȫԴߣ2msͨԶԶڱ150Aߵ800AҲʹùѹȫԴߡ
ʽѹ޼϶ʽѹʹ϶ʽѹڴ϶ķɢȴԼ϶ŵӰ죬϶ʽѹ¹̫ߣá
ԣ÷еѹװɿعڵ޼϶ʽѹPTڵѹװùͬɡÿعʽѹPTۿعרŵѹװáÿԪĶһ£Ҫƶ·غϹж·߲IJѹϵͳⲿ׵벨ڲг񡢽ӵصȣ˲ʱԹѹѹװÿǿԻ͹ѹͷĵĶȣƹѹķֵΪѹͻĵ1
2.2װ
ѹͻ䵼µƻСڵѹͻСҪֿǸֹѹɵĹѹѹװҪ˲ʱԹѹõģѹͻһѹƳͻᵼ¹ѹĻγȻۡȱͨ˵ıըװõڹѹܲסʱϵͳѹͻҪԶʱѹװѹϵĵ2
2.3ӵװ
ϵͳʱЪԻӵعϣʱЪԻӵعѹѹͻͨѹװáװõĿƻ޷ʱͨйŵԪʵֵѹͻĶԵйšҪԳʱļЪԻӵعѹΪϵͳѹĵ3
2.4༶Ĺԭ
ͳPTֻǶԵѹвṩ100VѹDZʹã֪ĿӦ棬ԣ÷ÿĸߵPTΪPTۺϿƹ
PTۺϿƹPTװá쳣װKYZKѹװKYXװKYDӵװùͬɣװĸϡ滻PT
õѹͳPTĹܣҪDzʾܡõ쳣ǣʵʱ⹩ı仯Ե쳣仯зжϹ緢쳣ԭ򣬲ԵĴ
ڹϵͳĹѹʲôԭģѹPTۿعڵѹװڹϷ˲ʱѹﵽֵʱѹпԵ赼ͨ͹ѹͷȣƹѹֵѹ˲ʱԵģԪҪͶ룬ѹ̽
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һ£ĶʩͿԱ֤ϵͳĵѹͻ䲻ᳬõ豸ľԵҪȷϵͳİȫУϵͳʱЪԻӵأͨѹЪԻӵعѹȻڣPTۿعڵĽӵصԪЪԻӵصĹֱӽӵأǿϵͳڱ֤豸ȫǰ´С
̣ϵͳӦǰȫģԱݹԼҪͣάޡ
3Ե㾭Ȧӵϵͳ
Թҵ3~35kVԵ㾭ȦӵصĹϵͳԼȦԡȦԪγһļϵͼ2ʾʵƷãã
Ȧӵزװ0+ѹװ1+װ2+йװ3

ͼ2 Ȧӵϵͳļԭͼ
10kVĸ
ѹ
KYZK
KYD
PTۿع
ӵװ
Ȧ
1
2
3
0

 
 
 
 
 
 
 
 
 
 
3.1Ȧ
ȦΪһֱʩҪϵͳԵɢݵϴ󣬿ܵ¼ЪԻӵعѹ⣬Ҫԭõеݵλ180ԭϵͳĵݵвֲֻԹƵѹЪԻӵعϳǸƵ񵴹ѹȦΪ
⣬Ȧԭĵѹͻûбá豸гܵĹѹⲿ׵ѹϵͳ仯ʱܲ񵴣۶ڲѹ͡ԭ׵ѹַΪֱ׹ѹӦ׹ѹ׵벨ѹڲѹҪΪʱѹѹڲѹַΪݸɹѹиɹѹԼЪԵ绡ӵعѹȡչѹʱ仮֣˲ʱԵѹʱѹʱѹȡ
ԣװȦܹѹãԼϵͳӵطļʣΪһϵ0Ȧ⣬ϵͳѹϵǰãȦΪ㼶ãͬγļķϵ
3.2ԭ
ȦԤʽûʱϵͳЪԻӵعѹȦٽϵͳɢݵIJСһֵʱѹƹ̽ȦеĹѹԭϵͳѹϵͳѹĿưǰ13Ķԭϵͳʵʩ
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4Ե㾭Сӵϵͳ
Թҵ3~35kVѹϵͳСӵصĹ緽ʽСӵصĹԣγϵͼ3ʾʵƷãã

10kVĸ
ѹ
ͼ3 Сӵϵͳԭͼ
KYZK
KYD
PTۿع
ӵص
1
2
3

ѹװ1+װ2+Եӵص3

 
4.1Եӵص
ԵСӵװҪԵӵعϣӵءЪԻӵءԵͨСӵأҪĿԳʱϳĵӵعͨ·բʵֹϵͳıеϵͳѹͻ䡣
ʲôԭµϵͳѹϵͳƻǵѹͻķֵͲͷȣԼѹʱ䣬ҲǵѹͻԣСӵϵͳ屣ϵͳһڣܴ屣ϵ
4.2ԭ
ԵСӵϵͳѹKYG-IPTۺϿƹ
KYG-IPTۺϿƹPTװá쳣װáѹװáװùͬɣװĸϡ滻PTKYG-IPTۺϿƹйŵԪ䱣ԵСӵعеͬ
ԵСӵصĹ緽ʽ屣ϵĻԭ£
쳣ʵʱ⹩ı仯Ե쳣仯зжϹ緢쳣ԭ򣬲ԵĴ
ڹϵͳĹѹʲôԭģѹPTۿعڵѹװڹϷ˲ʱѹﵽֵʱпԵ赼ͨ͹ѹͷȣƹѹֵѹ˲ʱԵģԪҪͶ룬ѹ̽
ϵͳǽӵԭµĶʱѹѹͻѹѹװõPTۿعڵװͶУһƹѹյѹͻ
ϵͳӵعϣӵغͼЪԻӵأԵӵص·γɴʵֹгڹг֮ǰгγɵĹѹеȷõ豸İȫ
5
1ҵ3~35kVϵͳֻijһֹԭѡѹIJƷʵﲻԤЧװγһµĹϵ㡣
2ݹ緽ʽIJͬӦƶһѹƷո÷ϵͳѹıƷ
3ѹӦøݹѹĴСγһ༶ı㣬IJ໥ϡ
4༶и֮IJϱ֤ϵͳĹѹᳬ豸ľԵϹϵͳȫЧС
 
 
ο
1ƽ,˼366kVϵͳѹ÷֣̽ұ20159
2٣ףϵͳӵرоѧ빤̣20024
3˼366kVϵͳѹӦ뷢չߵѹ20048
 
 
 
 
 

 
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