Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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高鐵AT供電TFN故障對測距的影響

來源:電工電氣發(fā)布時間:2019-03-22 10:22 瀏覽次數(shù):881
高鐵AT供電TFN故障對測距的影響
 
陳海軍1,王維北2
(1 廣州鐵路職業(yè)技術(shù)學(xué)院,廣東 廣州 510430;2 廣州鐵路集團(tuán)有限公司廣州供電段,廣東 廣州 501000)
 
    摘 要:運行中高鐵供電系統(tǒng)發(fā)生TFN故障,測距裝置提供的結(jié)果與實際情況有較大差異,并且斷路器跳閘時將事故范圍擴(kuò)大。通過實例分析,指出測距裝置沒有設(shè)置TFN故障的判據(jù),且TF故障判據(jù)整定值過小,將TFN故障錯判為T型或F型故障,是產(chǎn)生偏差的原因。可通過增大TF 型故障判據(jù)的電流數(shù)值,減少TF故障類型判斷的錯誤,或考慮增設(shè)TFN故障類型判據(jù)。TN故障或FN故障,可能在斷路器重合閘時發(fā)展成為TFN故障,電抗法測距結(jié)果存在較大誤差,可用吸上電流比法計算輔助驗證測距結(jié)果。根據(jù)每次故障實際情況修正Q -L特性表,不斷提高測距精度。同時合理設(shè)置變電所、AT所和分區(qū)所的保護(hù),選擇性跳開故障線路,縮小事故范圍。
    關(guān)鍵詞:AT供電;故障;測距;偏差
    中圖分類號:U226     文獻(xiàn)標(biāo)識碼:A     文章編號:1007-3175(2019)03-0046-05
 
Influence of TFN Fault on Distance Measurement of AT Feeding System of High Speed Railway
 
CHEN Hai-jun1, WANG Wei-bei2
(1 Guangzhou Railway Polytechnic, Guangzhou 510430, China;
2 Guangzhou Power Supply Section of China Railway Guangzhou Group Co., Ltd, Guangzhou 501000, China)
 
    Abstract: When the TFN fault occurs in the high speed rail power supply system, the result provided by the location device is quite different from the actual situation, and the scope of the accident is enlarged when the circuit breaker tripped. The fault case analysis shows that the cause of the deviation is that the fault location device does not set the criterion of the TFN fault type, and the TF fault type criterion value is too small, and the TFN fault is misjudged to be type T or F type. By increasing the current value of the TF fault criterion, the error of TF fault type can be reduced, or the TFN fault type criterion can be added. TN fault or FN fault may develop into TFN fault when circuit breaker reclosing, the result of reactance method has great error at the moment, the current ratio method can be used to assist the verification of the ranging results. According to the actual situation of each fault, the Q-L characteristic table would be amended to improve the ranging accuracy continuously. And the protection scheme of substation, AT institute and subdivision should been rationally configured, the fault line will be selectively tripped to minimize the scope of the accident.
    Key words: AT feeding system; fault; location; deviation
 
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