Current control temperature method based on global position system (GPS) space-time compensation

Abstract

The invention relates to a current control temperature method based on global position system (GPS) space-time compensation. The method comprises the steps that after the master controller is initialized, the master controller judges and conduct updating compensation on an initial current through related subprograms, a thermocouple conducts real-time sampling on information such as cable core temperature, jacket temperature and environment temperature, and sends the real-time sampling to an analog quantity conversion interface of a controller through a transmitter module, and the sampling is converted to be final digit information after operated by a program, converted to be an American standard cord for information interchange (ASCII), sent to an upper computer through a serial port bus, and displayed in a real-time mode. The master controller controls lifting motions of a motor of voltage regulator through comparing the cable core temperature with set target temperature, and then controls the magnitude of a current loaded on a cable. According to the GPS, longitude and latitude information and temperature information of a test field are confirmed and serve as test reference, a current analog initial target current value is detected, judged and updated in a real-time mode, the aims of rapid regulation and cable core temperature stabilization are achieved, and the requirement for long-time control of the cable temperature is achieved.

Description

technical field [0001] The invention relates to a cable temperature testing method, in particular to a current control temperature method based on GPS time-space compensation in an external cable cycle heating test. Background technique [0002] Power cables, especially submarine cables and overhead open wires used in special occasions, need to be tested for characteristic indicators before they are put into the market to verify the actual operation of the cables in different environments, different temperatures, and different seasons. The cable ampacity-temperature relationship directly reflects the working characteristics and actual carrying capacity of the power cable, and is an important test index in the field of cable testing. According to the IEC60364 standard of the power cable industry, when the temperature of the XLPE cable conductor is controlled at 90°C, the steady-state current is the maximum current carrying value of the cable, and the load current passing thro...

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Problems solved by technology

[0003] The present invention aims at the problem that the temperature change of cables in different regions, different temperature zones, different seasons, and different meteorological environments has different effects on the cable carrying capacity, and proposes a current control temperature method based on GPS time-space compensation, and the latitude and longitude are positioned by GPS Information, temperature zone information and current time, determine the compensation coefficient of the test site, obtain the simulated cable core temperature information of the current test site through the site ambient temperature sensor, form a compensation test table based on these information and import it into the main controller to achieve dynamic control test The purpose of the process, and finally to achieve 24 / 7 automated testing

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