Strongly robust approach for temperature monitoring of power cable joint

Tang, Liezheng; Ruan, Jiangjun; Qiu, Zhibin; Liu, Chao; Tang, Ke

doi:10.1049/iet-gtd.2018.5924

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…The most common indirect real-time measurement for conductor temperature of cable joint is based on the thermal circuit model [13][14][15]. In our previous papers, an alternative indirect approach was put forward to realize the hotspot temperature monitoring for the cable joint in two steps [16], which shows strong robustness with the variable thermal environments and uncertain thermal parameters of the joint [17]. Afterwards, the authors applied this method to the fully insulated busbar taped joint, which indicates the high model precision and strong robustness to the solar radiation impact [18].…”

Section: Figurementioning

confidence: 99%

Conductor temperature monitoring for the fully insulated busbar prefabricated joint considering contact resistance

Tang

Ruan

Chen³

et al. 2022

IET Generation Trans & Dist

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The fully insulated busbar system, which has been extensively used in the industry, contains a large number of joints due to its limited length, and thus it is prone to overheating failure caused by poor contact. Taking the uncertainty of contact resistance into account, this paper presents an indirect approach to monitor the conductor temperature for the fully insulated busbar prefabricated joint using the busbar surface temperatures. The model is composed of radial direction temperature calculation (RDTC) in the busbar and axial direction temperature calculation (ADTC) in the conductor. The equivalent thermal resistance of joint is defined to characterize the influence of contact resistance, based on which RDTC and ADTC are corrected by an iterative method. The temperature rise test of the prefabricated joint was carried out. When the contact state is normal, the transient and steady‐state error is within 4 and 1 K, respectively. When the contact state is abnormal, the steady‐state error under rated current is less than 5 K, and the transient error with the step load is about 10 K, which is thoroughly analyzed. From an engineering point of view, the proposed algorithm can effectively monitor the joint hotspot temperature and evaluate the contact state.

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Section: Figurementioning

confidence: 99%

Conductor temperature monitoring for the fully insulated busbar prefabricated joint considering contact resistance

Tang

Ruan

Chen³

et al. 2022

IET Generation Trans & Dist

Self Cite

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“…Due to many practical advantages, HV XLPE cables have been widely utilized as the power transmission equipment in power system [1][2][3]. In the structure of HV XLPE cable, the buffer layer can form a good electrical connection between the insulation screen layer and the aluminium sheath, and has the function of axial water-blocking [4,5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of influencing factors on buffer layer discharge for high‐voltage XLPE cable

Lai

Zhou

et al. 2022

IET Generation Trans & Dist

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In the high-voltage (HV) cross-linked polyethylene (XLPE) cable, the buffer layer has the function of electrical connection and water-blocking. However, after water invades cables, the buffer layer discharge defect may occur, which can lead to the breakdown accident of cable line. It does serious harm to the safe and stable operation of the power system. At present, the buffer layer discharge defect has not been sufficiently investigated in existing research. This paper establishes a voltage distribution calculation model for analyzing the buffer layer discharge defect. The mechanism of how the presence of air gap and white marks (the corrosion products) between aluminium sheath and buffer layer influencing the voltage distribution inside cable is involved in this model. Based on the simulation software, a convenient method for solving the model is proposed. Using this model, the internal voltage distribution results of the cable under different forms of white marks are obtained. The influencing factors affecting the discharge of buffer layer are analyzed. The validity of the model is proved by the discharge test of the cable with controllable defects. The results show that the risk of buffer layer discharge can be quantitatively assessed by the white mark defect feature.

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“…Another study [6] presented a model able to obtain the real-time temperature of three-core cable joints under unbalanced three-phase currents and considered the effect of contact resistance in connectors. In [7], an approach for hot spot temperature computation of cable joints was proposed and evaluated by radial basis function neural networks. In such works, however, the influence of CR with respect to cable heating was not quantitatively investigated.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects of Ground Faults on MV Joints and Cables

Bragatto

Cerretti²,

D'Orazio³

et al. 2019

Energies

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In recent years, an anomalous increase of faults in underground medium voltage (MV) cable lines has been recorded in Italy, especially during summer; the largest number of faults affected cable joints. The assessment of joint thermal stress, both in normal operation and during faults, is paramount. The study presented in this paper focuses on cable heating effects due to short circuit currents flowing through cable screens during ground faults (e.g., in case of cross country faults, CCFs, whose current values are comparable to line-to-line short circuit), considering the contact resistance (CR) between cable screens and copper stocking due to inaccurate joint manufacturing. A thermal model, already developed and discussed by the authors in previous papers, has been extended and applied in this study in order to assess the CR effects in cable and joint heating during failures. Parametric studies have been carried out on a typical cable-joint system, varying fault current and CR values, as well as considering protection schemes normally adopted by distribution system operators (DSOs) in Italian MV distribution grids. Results show that for CR values larger than few milliohms, fault currents due to CCFs are able to overheat the joint well beyond the maximum tolerable temperature of insulation, thus leading to cable failures when the shortest fault clearing times (i.e., 120 ms) are considered.

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Strongly robust approach for temperature monitoring of power cable joint

Cited by 10 publications

References 20 publications

Conductor temperature monitoring for the fully insulated busbar prefabricated joint considering contact resistance

Conductor temperature monitoring for the fully insulated busbar prefabricated joint considering contact resistance

Analysis of influencing factors on buffer layer discharge for high‐voltage XLPE cable

Thermal Effects of Ground Faults on MV Joints and Cables

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