Ampacity Decrease in a Three-phase Power Cable Fed by an Uncontrolled Rectifier and Finding a Lower Limit for the Power Cable Loss

Öz

23.06.2023 Accepted: 25.07.2023 DOI: 10.55581/ejeas.1293146 Abstract—Rectifiers are the most common nonlinear loads encountered in electrical power systems. Uncontrolled rectifiers are cheaper than synchronous rectifiers and more common than them because of this but the currents drawn by uncontrolled rectifiers contain harmonics. In addition, the amplitude of these harmonics depends on the value of the load power and the rectifier parameters. A 3-phase cable can be used to connect a three-phase rectifier to a 3-phase power system. In this study, the power losses of a 3-phase cable fed by a synchronous rectifier and an uncontrolled rectifier were compared. The electrical equivalent of a power cable is frequency dependent. The analysis performed in this study was made by making some assumptions about the frequency-dependent resistance of the cable and the rectifier currents. The analysis shows that when an uncontrolled rectifier is fed by a power cable, the cable always has more loss and heats up more for the same amount of RMS current.

Anahtar Kelimeler

• Cable Modeling
• Loss Calculation
• Harmonic Analysis
• Circuit Analysis
• Rectifiers.

Proje Numarası

UPN-2205.

Kontrolsüz Bir Redresörle Beslenen Üç Fazlı Bir Güç Kablosunda Amper Kapasitesinin Azalması ve Güç Kablosu Güç Kaybının Alt Değerinin Bulunması

Öz

Doğrultucular elektrik güç sistemlerinde en yaygın karşılaşılan nonlineer yüklerdir. Kontrolsüz doğrultucular senkron doğrultuculara göre daha ucuzdur ve bundan dolayı daha yaygındır ama kontrolsüz doğrultucuların çektikleri akımlar harmonik içermektedir. Ayrıca bu çekilen harmoniklerin genliği yükün gücünün değerine ve doğrultucu parametrelerine bağlıdır. Üç fazlı bir doğrultucuyu üç fazlı güç sistemine bağlamak için üç fazlı bir kablo kullanılabilir. Bu çalışmada senkron bir doğrultucu ve kontrolsüz bir doğrultucu tarafından beslenen üç fazlı bir kablodaki kayıplar karşılaştırılmıştır. Bir kablonun elektriksel eşdeğeri frekansa bağımlıdır. Bu çalışmada yapılan analiz kablonun frekansa bağımlı direnci ve doğrultucu akımları üzerine bazı kabuller yapılarak bulunmuştur. Yapılan analiz kontrolsüz doğrultucu kullanıldığında 3 fazlı kablonun her zaman daha fazla kayba sahip olduğunu ve daha fazla ısınacağını göstermektedir.

Anahtar Kelimeler

• Kablo Modelleme
• Kayıp hesabı
• Harmonik Analizi
• Devre Analizi
• Doğrultucular.

Destekleyen Kurum

Ünika Üniversal Kablo Sanayi ve Tic. A.Ş.

Proje Numarası

UPN-2205.

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