RU200016U1 - Relay unit diagnostics stand - Google Patents

Abstract

The utility model relates to the field of service and repair, in particular to devices for non-destructive diagnostics of electromagnetic devices with a switching magnetic system. This utility model contains a voltage supply for the winding of the controlled relay RMUG, a winding current sensor in the form of a resistor connected in series with the relay winding, characterized in that the design includes two measurement circuits for normally closed and normally open groups of RMUG relays with connectors for connecting the RMUG relay and terminals for measuring resistance on a normally open and normally closed relay group, as well as a light indication of the presence of voltage on the RMUG relay groups. The technical result is expressed in increasing the reliability of the GPU operation, through the timely detection of the RMUG ACS GPU relays that have exhausted their resource.

Description

The utility model relates to the field of service and repair, in particular to devices for non-destructive diagnostics of electromagnetic devices with a switching magnetic system.

In gas-pumping units (hereinafter referred to as GPA) of various types, automated control systems (hereinafter referred to as ACS) are used, implemented, inter alia, on RMUG units (small-size control hermetic relay). As a rule, such ACS GPA consists of 80 blocks, each block contains 2 relays (RMUG), therefore, 160 RMUG relays are installed in each ACS GPA. The functional capabilities of these ACS GCUs do not provide for diagnostic systems (including self-diagnostics).

There is a problem of failures of the ACS of the GPU due to the failure of the RMUG relay, which lead to emergency stops and a delay in starting the GPU. One of the main reasons for the failure of the RMUG relay is burning of the contacts, which leads to an increase in the transition resistance.

To maintain the operability of the ACS GCU in working condition with the proper level of reliability, it is necessary to diagnose the malfunction and determine the dynamics of deterioration of the parameters of the RMUG relay with subsequent replacement.

A known stand for diagnostics of low-current electromagnetic relays, containing a power supply voltage for the winding of the controlled relay, a winding current sensor in the form of a resistor connected in series with the relay winding, and a single-beam oscilloscope for observing the shape of the turn-on current, in addition, an additional connected parallel to the diagnostic channel of the controlled relay is introduced into the stand the diagnostic channel of the reference electromagnetic relay of the same type as the controlled one, containing the reference relay, and an additional current sensor in the form of a resistor connected in series with the reference relay winding [utility model patent RU 173176, cl. H01H 49/00, 2017].

This technical solution was adopted for the prototype of the claimed utility model. The disadvantage of the prototype is that it does not allow evaluating the resource of the RMUG relay.

The technical result of this utility model is expressed in increasing the reliability of the GPU operation through the timely identification of the relay RMUG ACS GPU with unsatisfactory parameters.

The delivered technical result is achieved by the fact that in the well-known test bench for low-current electromagnetic relays, taken as a prototype, containing a voltage supply for the winding of the controlled relay, a winding current sensor in the form of a resistor connected in series with the relay winding, while the structure includes two circuits for measuring normally closed and normally open groups of RMUG relays with connectors for connecting the RMUG relays and terminals for measuring resistance on a normally open and normally closed group of relays, as well as light indication of the presence of voltage on groups of relays RMUG.

FIG. 1 shows the constructive diagram of the utility model. FIG. 2 shows the electrical schematic diagram of the utility model.

FIG. 1 is marked: 1 - housing, 2 - power supply, 3 - connector for connecting the RMUG relay when determining the contact resistance of normally closed contact groups, 4 - connector for connecting the RMUG relay when determining the contact resistance of normally open contact groups, 5 - terminals for measurement resistance on the normally open group of the RMUG relay, 6 - terminals for measuring the resistance on the normally closed group of the RMUG relay, 7 - light indication of power supply to the circuit, 8 - light indication of power supply to the circuit of normally open contacts, 9 - power supply switch to the circuit, 10 - switch for power supply to the circuit of normally open contacts.

The utility model works as follows (in accordance with Fig. 1 and Fig. 2). The stand is based on the principle of measuring the contact resistance of the relay contact groups. The determination of the contact resistance is made by measuring the voltage drop across the relay contacts at a stable current in the circuit of 100 mA. Switch - 9 (SA1) supplies power to the measurement circuit, this is evidenced by the light indication of power supply to the circuit - 7 (HL1). Connector - 3 (X4) is used for switching with the diagnosed relay unit in the mode of measuring the transient resistance of normally closed contact groups, and connector - 4 (X3) - respectively normally open. To measure the voltage drop across the RMUG relay contacts, use the terminals - 6 (X2.1 (+) X2.2 (-)) for normally closed contacts and - 5 (X1.1 (+) X1.2 (-)) for normally open ... Switch 10 (SA2) is used to supply voltage to the relay unit in connector 4 (X3) when measuring the contact resistance of normally open contacts. During measurement, all contacts in the relay block are connected in series, if at least one group of contacts is faulty, then the entire block is rejected.

According to the passport data of the RMUG relay, the resistance of one contact should be no more than 0.6 Ohm. Since there are 8 contacts in the relay block, the resistance should be no more than 4.8 ohms. Diagnostics is reduced to measuring the current resistance value and comparing it with the maximum allowable value. If the resistance value is less than 4.8 Ohm, then such a relay is suitable for operation, otherwise the relay must be replaced.

The utility model was applied during the diagnostics of the ACS of the GPA KTs-1 of the Ekaterinovskiy LPU MG OOO Gazprom transgaz Saratov, 240 blocks were diagnosed, of which 30 were rejected. Thus, the utility model allows:

- timely identify faulty and unstable operating RMUG relays;

- to reduce the likelihood of an emergency shutdown of the GPU due to a malfunction and defects in the relay RMUG ACS GPU.

Claims (1)

A stand for diagnostics of relay units, containing a voltage supply for the winding of the controlled relay, a winding current sensor in the form of a resistor connected in series with the RMUG relay winding, characterized in that the design includes two measurement circuits for normally closed and normally open RMUG relay groups with connectors for connection RMUG relay and terminals for measuring resistance on a normally open and normally closed relay group, as well as light indication of voltage presence on the RMUG relay groups.

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