JWXC-1700 type relay small-capacity load reliability test system

Abstract

A JWXC-1700 type relay small-capacity load reliability test system comprises an adjustable load system, and a signal conditioning circuit, an isolation sampling circuit, a high-speed acquisition boardcard, an industrial personal computer main control module, a control board card and a solid-state relay group which are connected in sequence; the input end of the signal conditioning circuit is connected with a plurality of sample relay contact loops, the adjustable load system is connected to the sample relay contact loops, and the sample relay contact loops are connected with a programmable load power supply; and the solid-state relay group is composed of a plurality of solid-state relays, each solid-state relay is correspondingly connected with a test object relay coil, and the solid-state relay group is further connected with a program control coil power supply. The system can complete the reliability test of a railway signal relay under the condition of a small-capacity adjustable resistive load, and provides reference for the reliability of the railway signal relay under the conditions of extremely low voltage and extremely low current load.

Description

technical field [0001] The invention belongs to the technical field of relay reliability testing and relates to a JWXC-1700 relay small-capacity load reliability testing system. Background technique [0002] During the field use of JWXC-1700 type relay, the phenomenon of poor contact of the ordinary contact of the relay occurred. After investigation, it was found that the relay was used in the railway signal re-square circuit. Under normal conditions, the relay was in the falling state. , After changing the direction again, the relay fell, and the lower contact and the middle contact appeared to be in poor contact or even disconnected. There are two reasons for this phenomenon. One is that the surface of the contact is oxidized due to long-term non-action so that the contact conduction is poor; the other is that the contact load current is too small to cause poor contact. In order to ensure the safety of railway transportation and ensure a more stable signal system, a JWXC-...

AI Technical Summary

Problems solved by technology

[0002] During the field use of JWXC-1700 type relay, the phenomenon of poor contact of the ordinary contact of the relay occurred. After investigation, it was found that the relay was used in the railway signal re-square circuit. Under normal conditions, the relay was in the falling state. , after changing the direction again, the relay falls, and the lower contact and the middle contact appear to be in poor contact or even disconnected.

There are two reasons for this phenomenon. One is that the surface of the contact does not move for a long time, resulting in poor electrical conductivity of the contact; the other is that the contact load current is too small to cause poor contact.

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