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摘要
煤礦地面變電所是煤礦供配電的重要組成部分，它直接影響整個煤礦供電的可靠運行，是聯(lián)系地面與井下的中間環(huán)節(jié)，起著變換和分配電能的作用。電氣主接線是地面變電所的主要環(huán)節(jié)，電氣主接線的擬定直接關系著全所電氣設備的選擇、配電裝置的布置、繼電保護和自動裝置的確定，是決定變電所電氣部分技術經(jīng)濟性能的關鍵因素。
本設計初步設計了煤礦地面35kV變電站的設計。設計過程主要包括負荷計算、主接線設計、短路計算、電氣設備選擇、繼電保護方案等。通過對煤礦35KV變電站做負荷統(tǒng)計，用需用系數(shù)法進行負荷計算，根據(jù)負荷計算的結果確定出該站主變壓器的臺數(shù)、容量及型號。用標幺值法對供電系統(tǒng)進行了短路電流計算，為電氣設備的選擇及校驗提供了數(shù)據(jù)。根據(jù)煤礦供電系統(tǒng)的特點，制定了礦井變電所的主結線方式、運行方式、繼電保護方案。其中35kV側為內橋接線，6kV主接線為單母分段。兩臺主變壓器采用分列運行方式。并根據(jù)電流整定值以及相關數(shù)據(jù)的校驗，選擇了斷路器、隔離開關、繼電器、變壓器等電氣設備。
關鍵詞：變電所；地面；選型；系統(tǒng)設計；
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Abstract
Coal mine ground substation is an important part of the coal mine power supply, it directly affect the reliable operation of the whole coal mine power supply, is contact with the ground and underground of the intermediate links, plays a transformation and distribution of electric energy effect. Ground substation main electrical wiring is the main link, the main electrical wiring to unsafe has a close relationship with the selection of electrical equipment, power distribution equipment layout, the determination of relay protection and automatic device of electric substation technical and economic performance is the key factor.
The preliminary design of the coal mine ground, 35 kv substation design. Its design process mainly include load calculation, the main wiring design, short-circuit calculation, electrical equipment selection, relay protection scheme, etc. Through to the coal mine do load statistical 35 kv transformer substations, the demand factor method for load calculation, according to the result of load calculation to determine the station of the main transformer sets, capacity and model number. With the method of power supply system for the short-circuit current calculation, provides the selection of electrical equipment and calibration data. According to the characteristics of the coal mine power supply system, make the mine substation main connection mode, operation mode, relay protection scheme. Within 35 kv side for bridge connection, 6 kv single mother block for main connection. Two of the main transformer USES operation mode respectively. And according to the current setting value and related data check, choose the circuit breaker, isolating switch, relay, transformers and other electrical equipment.
Keywords: Substation; The ground; Selection; System design；