Time domain response-based inter-double-cable transient state temperature rise acquisition method
A technology of time-domain response and acquisition method, which is applied in the field of acquisition of transient temperature rise between two circuits, can solve problems such as operation and maintenance workload, low system reliability, and increased primary investment of devices/systems, so as to overcome aging The effect of poor performance, fast calculation and easy expansion
Active Publication Date: 2017-04-26
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology
[0005] However, there are some defects in this type of method: 1) Essentially, this type of method only realizes the measurement and estimation of the temperature rise process of a single cable, and cannot separate the mutual influence between cables, so it cannot realize the temporary calculation under the condition of multiple cable load changes. 2) It depends heavily on the health status of the temperature measurement device, and defects such as temperature measurement deviation and transmission communication will directly restrict the selection of cable equipment operation
Considering that there are several sections of a cable that need to be monitored, it is necessary to install multiple sets of temperature measuring devices, so the reliability of the overall system is extremely low, which is also the fundamental reason why this type of method cannot be directly applied on a large scale; / The overall reliability of the system needs to enhance the redundant design, or even the method of combining multiple sets, which not only increases the initial investment of the device / system, but also brings a huge workload to the subsequent operation and maintenance
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[0043] 1. The principle of this method is as follows:
[0044] The heating of multi-circuit cables mainly depends on the cable loss and the thermal characteristics of the section where it is located. The former has a clear correspondence with the operating current and operating temperature and can be directly applied; while the latter mainly depends on the geometric parameters of the section and the physical parameters of each part. , it can be considered that the physical parameters remain unchanged in the operating temperature range, which provides a theoretical basis for the establishment of the model.
[0045] The temperature reference point of the proposed model of the present invention is ambient temperature, and the model is as follows figure 2 Shown (take the heat transfer from cable 1 to cable 2 as an example).
[0046] Among them, I1 is the thermal load of cable 1, which can be obtained through electrical knowledge; R1 is the comprehensive thermal resistance of cab...
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The invention relates to a time domain response-based inter-double-cable transient state temperature rise acquisition method. The method comprises the following steps of 1) obtaining an intrinsic coefficient of each cable of the two cables separately, and establishing a double-cable heat dissipation finite element physical model; 2) determining parameters in the finite element physical model to generate an inter-double-cable transient state temperature rise model, and adjusting the parameters after verification; and 3) taking an environment temperature as a temperature reference point, obtaining a cable thermal load in actual operating of the first cable, and calculating inter-double-cable transient state temperature rise according to the inter-double-cable transient state temperature rise model, namely the thermal load of the first cable and the transient state temperature rise of a second cable core wire. Compared with the prior art, the method has the advantages of rapid and convenient calculation, convenient expansion and the like.
Description
technical field [0001] The invention relates to the technical field of power cable operation, in particular to a method for acquiring transient temperature rise between two cables based on time domain response. Background technique [0002] Due to the particularity of power cable operation, it is generally impossible to obtain the core temperature of the power cable through direct measurement, especially the real-time transient temperature of the core. Therefore, technicians have proposed a variety of methods to calculate the core temperature of the power cable. Engineering formulas or approximate formulas based on numerical solutions and test results. For example, based on the IEC60287 standard, it is a classic calculation method for calculating the core temperature of power cables, and a solution method for ampacity based on numerical calculation. For the cable in actual operation, the numerical method is used to solve the problem. Considering the complexity of the workin...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 傅晨钊司文荣李红雷姚周飞
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO