Method and device for measuring current-carrying capacity of joint

Abstract

The invention discloses a joint current-carrying capacity measuring method, which is characterized by comprising the following steps of: a, measuring the temperature T1 and the current current value I1 of a joint in the current environment at the moment t1; b, measuring a heat dissipation index K1 corresponding to the temperature T1 in the current environment; c, measuring a corresponding heat dissipation index K2 when the preset temperature T2 is measured in the preset environment; and d, calculating the current-carrying capacity I2 = I1 * (K2 / K1) 1 / 2 of the joint working at the preset temperature T2 in the preset environment. According to the invention, the equipment operation department can judge the health state of the joint through one-time measurement, and the predicted current-carrying capacity is provided for the scheduling department, so that the power supply load and power-off maintenance of the related equipment can be arranged according to the basis, and the economic benefit and the equipment safety are greatly improved.

Description

technical field [0001] The invention relates to the field of electric power transmission, in particular to a method and device for measuring the ampacity of a joint. Background technique [0002] At present, power transmission mainly connects several wires through wire joints to transmit electric energy from the power supply end to the load end. The maximum allowable ampacity of conductors is generally calculated by steady state, and the ampacity of conductors is determined at the design stage. Due to the complexity and uncertainty of the heat transfer environment of conductors, designers usually make the most unfavorable heat dissipation assumptions to obtain a sufficiently safe current value. It is also possible to calculate and infer the real-time dynamic ampacity of conductors by measuring environmental parameters to achieve line capacity increase. During the operation of the line, the resistance of the conductor body can be regarded as a fixed value (regardless of the...

AI Technical Summary

Problems solved by technology

In practical applications, the existing technology has the following deficiencies: (1) The influence of high-altitude wind speed on heat dissipation is not considered, resulting in a large number of serious joint defects being ignored because the temperature rise does not reach the judgment threshold of defects

(2) When the temperature is low, even if the joint resistance has increased significantly, the infrared temperature measurement shows that the temperature difference between the joint and the wire has not reached the threshold

(4) Even if the joint is found to be heated, it is impossible to measure the safe current carrying capacity of the defective power transmission equipment, so as to control the temperature of the joint so as not to exceed the allowable value for operation

The above technologies are insufficient, and the temperature measurement of the joints by the operating unit in winter and spring cannot achieve the desired effect. The time window for finding and repairing defective joints is lost when the load is low. Generally, the temperature measurement work is intensively arranged during the peak load period in summer. Once found If the joint is seriously heated, it is necessary to cut off the power for maintenance during the peak load period in summer, causing huge economic losses

[0004] Measuring joint temperature alone does not accurately characterize the true health of the joint

The disadvantage of the existing technology is the lack of effective detection methods and devices for correlating and characterizing the health status of joints

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