Non-contact acquisition contact resistance device and method

Abstract

The non-contact type contact resistance acquisition device comprises a relay magnetic circuit, and is characterized in that a first temperature measurement sensor (5) and a second temperature measurement sensor (6) are distributed on the upper side and the lower side of a movable contact (3) of the relay magnetic circuit (1); the first temperature measuring sensor (5) and the second temperature measuring sensor (6) are respectively aligned with the static contact rear contact (2) and the static contact front contact (4) on the upper side and the lower side of the movable contact (3); according to the Joule law resistance and heat relation Q = I2Rt, a first temperature measuring sensor (5) and a second temperature measuring sensor (6) are used for detecting the temperatures of a static contact rear contact (2) and a static contact front contact (4) before and after loads, and measuring the contact temperature when the loads are not connected and the contact temperature when the loads are connected and reach thermal stability. The resistance value of the contact resistor is reversely calculated through the heating temperature difference on the premise that the current is known, the resistance value of the relay contact resistor is achieved, whether alarm information is sent out or not is determined according to an early warning value provided by the resistance value of the contact resistor under the load temperature, driving safety is guaranteed, and accidents are prevented.

Description

technical field [0001] The invention belongs to the technical field of railway signal products, and in particular relates to a non-contact collecting contact resistance device and method. Background technique [0002] Relays are widely used in railway signal technology, called signal relays (in railway signal systems, can be referred to as relays), which are important basic components in railway signal technology. Whether it is the core component of the relay signal system or the interface component of the electronic or computer signal system, it plays an important role. The reliability of the relay action directly affects the reliability and safety of the signal system. The railway signal relay is a dedicated electromagnetic switching device in various railway signal equipment or systems. It consists of electromagnetic coil, contact group, transmission system and components to ensure that the contacts are closed or opened. When the specified working current is applied to...

AI Technical Summary

Problems solved by technology

[0009] Whether the circuit can be successfully connected or disconnected is directly related to the contact resistance of the relay contacts, and the relay contacts will be separated during the repeated opening and closing of the device, which can generate high-temperature arcs and micro-melt the contacts; when When the load is turned on, the contact generates an arc, which will ignite the combustible substances in the air, produce carbon particles or other particulate matter and deposit on the contact, excessive deposition will even increase the contact resistance of the contact, and the partial pressure at the contact will affect the contact Working state of the circuit after the load

[0010] At present, the measurement of the contact resistance of railway signal relays is carried out on the relay test bench when the relay is switched back to the maintenance workshop during regular maintenance, or when the contact resistance of the relay contact is too large and has affected the circuit in the back stage of the load and cannot work normally. Replace the relay, and return the faulty relay to the workshop for contact resistance test. The problem caused by the contact resistance of the relay is basically in the state of fault repair, and the maintenance of the widely used relay is a relatively concentrated problem.

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