Calibration method of infrared temperature sensing protection online calibration device in electric high voltage cabinet

Abstract

The invention relates to an online calibration device and calibration method for infrared temperature protection in a power high-voltage cabinet, which is characterized in that it includes a power high-voltage cabinet, a temperature converter, a control module, a temperature calibration device, and a protection system for the power high-voltage cabinet; The miniature infrared temperature measuring probe in the cabinet measures and scans the temperature of the high-voltage equipment in the cabinet, and transmits it to the temperature converter. The overheating alarm in the protection system of the power high voltage cabinet will send out an alarm if the slight or moderate overheating fault value is reached. If the tripping value of sudden malignant overheating fault is reached, the control module will control the tripping coil of the circuit breaker to operate, and then control the switch to trip. The invention can ensure safe, timely and effective protection of the electric high-voltage cabinet when an overheating fault occurs under the condition of non-contact temperature sensing.

Description

technical field [0001] The invention relates to the field of electric high-voltage temperature testing, in particular to a calibration method for an infrared temperature-sensing protection online calibration device in an electric high-voltage cabinet. Background technique [0002] The high-voltage equipment in the power high-voltage cabinet will generate heat due to the electromagnetic effect during operation. During normal operation, its heating temperature is within the normal temperature range. The fault point produces a hot spot higher than the normal operating temperature range, and with the development of the fault, the higher the temperature of the hot spot, if there is no alarm at this time, even a slight overheating fault may quickly develop into a serious fault. When encountering sudden malignant faults such as short-term severe overload, short circuit, severe ground loss, or overvoltage shock, the temperature of the hot spot will rise sharply in a short time. If t...

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Problems solved by technology

When encountering sudden malignant faults such as short-term severe overload, short circuit, severe ground loss, or overvoltage shock, the temperature of the hot spot will rise sharply in a short time. If the circuit breaker is not tripped in time to cut off the power supply , will expand the accident, and even lead to the explosion and damage of the high-voltage cabinet, which seriously endangers the safety of the person and the power grid. Since the high-voltage cabinet is an armored and closed cabinet, various high-voltage electrical appliances are compactly installed in the cabinet, and it is forbidden to open the cabinet door during normal operation. , the cabinet door cannot be opened for temperature measurement by conventional temperature measurement method

The overheating protection method of the traditional electric high-voltage cabinet is strictly forbidden to open the cabinet door for testing and observation during operation. Since the high-voltage equipment in the high-voltage cabinet has high voltage, ordinary temperature measuring probes cannot directly contact the charged temperature-sensing parts. The staff carries an infrared temperature measuring instrument to measure the temperature of the shell of the high-voltage cabinet and compare it with the shell of other cabinets to judge whether there is a heating fault; or take a power failure, open the cabinet door and measure the contact DC resistance to determine whether there is an overheating fault

The former method is seriously lagging behind, and the heat emitted from the faulty heating point may be transmitted to the cabinet wall through the air, and the equipment has long been burned; the second method requires a power outage, and cannot be carried out with electricity during operation. The above two existing traditions cannot guarantee Safe, timely and effective protection of power high-voltage cabinets in the event of overheating faults

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