On-line calibration device and a calibration method for infrared temperature sensing protection in a power high-voltage cabinet

Abstract

The invention relates to an on-line calibration device and a calibration method for infrared temperature sensing protection in a power high-voltage cabinet, which is characterized in that the device comprises a power high-voltage cabinet, a temperature converter, a control module, a temperature aligner and a protection system of the power high-voltage cabinet. The temperature of the high-voltage equipment in the cabinet is scanned by a miniature infrared temperature measuring probe in the high-voltage cabinet of the electric power, and to a temperature converter, after conversion, it is sent to the control module for comparison with the preset fault value in the control module, If the fault value is slight, the overheat alarm in the protection system of the high voltage cabinet sends out an alarm. If the fault value reaches the malignant overheat tripping value, the control module controls the trip coil of the circuit breaker to trip the switch, thereby controlling the trip of the switch. Under the condition of non-contact temperature sensing, the invention ensures the safety, timely and effective protection for the high-voltage cabinet of the electric power when the overheating fault occurs.

Description

technical field [0001] The invention relates to the field of electric high-voltage temperature testing, in particular to an online calibration device and calibration method for infrared temperature sensing protection in a high-voltage electric 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 ...

AI Technical Summary

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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