An electrical fault diagnosis device

Abstract

The utility model discloses an electrical fault diagnosis device, which includes a power supply and a diagnosis unit. The diagnosis unit includes a fault detection device with an alarm dry contact, a relay and a fault indicator light. The control coil of the relay is connected to the power supply through the alarm dry contact of the fault detection device, the normally open main contact of the relay is connected in parallel to the alarm dry contact of the fault detection device, and the fault indicator light is connected to the power supply through the normally open auxiliary contact of the relay. The utility model uses a relay self-locking circuit to record the instantaneous action signal of the alarm dry contact, so that the fault alarm signal can be maintained for a long time. Even if the equipment is shut down, the fault signal sent before the shutdown will not be lost. The device can help staff to discover and handle equipment failures in a timely manner, improve maintenance efficiency, avoid frequent start and stop of equipment, and thus extend the service life of the equipment.

Description

Technical Field

[0001] The utility model relates to an electrical equipment fault diagnosis device, which can record the alarm signal output by the fault detection device for a long time and belongs to the field of detection technology. Background Art

[0002] Many mechanical equipment, such as large generators and air compressors, are equipped with fault detection devices to detect equipment malfunctions, excessive temperatures, and other faults. When a corresponding fault occurs in the equipment, the fault detection device outputs an alarm signal through the alarm dry contact to prompt maintenance personnel to handle the fault in a timely manner. Some faults will also cause the equipment to shut down to prevent the fault from spreading further and causing greater losses to the company.

[0003] In the early stage of equipment failure, the alarm dry contact often outputs instantaneous action signals. If the inspection and maintenance personnel do not find these signals in time, when the equipment stops, the alarm dry contact will also reset and the alarm signal will disappear. After the equipment is restarted, the fault will reappear, causing the equipment to start and stop frequently, seriously affecting the service life of the equipment. Therefore, it is very necessary to design an electrical equipment fault diagnosis device that can record the instantaneous action signal of the alarm dry contact for a long time. Utility Model Content

[0004] The utility model aims to provide an electrical fault diagnosis device capable of recording the instantaneous action signal of the alarm dry contact for a long time to solve the drawbacks of the prior art, so as to help maintenance personnel to find and handle equipment faults in time and prolong the service life of the equipment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An electrical fault diagnosis device comprises a power supply and a diagnosis unit, wherein the diagnosis unit comprises a fault detection device provided with an alarm dry contact, a relay and a fault indicator light, wherein the control coil of the relay is connected to the power supply via the alarm dry contact of the fault detection device, the normally open main contact of the relay is connected in parallel to the alarm dry contact of the fault detection device, and the fault indicator light is connected to the power supply via the normally open auxiliary contact of the relay.

[0007] The above electrical fault diagnosis device, the diagnosis unit also includes a pulse counter, and the voltage at both ends of the fault indicator light is connected to the pulse signal input end of the pulse counter.

[0008] In the electrical fault diagnosis device, a plurality of diagnosis units are provided, and the plurality of diagnosis units are connected in parallel.

[0009] The electrical fault diagnosis device further comprises a reset button SB, and the plurality of diagnosis units are connected to the power supply via the normally closed contact of the reset button SB.

[0010] The above-mentioned electrical fault diagnosis device, the power supply includes a power selection conversion switch SA and a switching power supply KD, and the external power supply directly supplies power to the diagnosis unit through the power selection conversion switch SA or supplies power to the diagnosis unit through the power selection conversion switch SA and the switching power supply KD in sequence.

[0011] The utility model uses the relay self-locking circuit to record the instantaneous action signal of the alarm dry contact, so that the fault alarm signal can be maintained for a long time. Even if the equipment is shut down, the fault signal issued before the shutdown will not be lost. The device can help staff to timely discover and handle equipment failures, improve maintenance efficiency, avoid frequent start and stop of equipment, and thus extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0013] Figure 1 It is the electrical principle diagram of the utility model;

[0014] Figure 2 It is an appearance diagram of the utility model.

[0015] The numbers in the figure are as follows: X1, detection terminal block, X2, power terminal block, SA, power selection switch, KD, switch power supply, SB, reset button, K1, first alarm dry contact, K2, second alarm dry contact, K3, third alarm dry contact, KA1, first relay, KA11, normally open main contact of the first relay, KA12, normally open auxiliary contact of the first relay, KA2, second relay, KA21, normally open main contact of the second relay, KA22, normally open auxiliary contact of the second relay, KA3, third relay, KA31, normally open main contact of the third relay, KA32, normally open auxiliary contact of the third relay, T1, first pulse counter, T2, second pulse counter, T3, third pulse counter, HL1, first fault indicator light, HL2, second fault indicator light, HL3, third fault indicator light. DETAILED DESCRIPTION

[0016] The utility model aims at the problems existing in the prior art and provides an electrical equipment fault diagnosis device, which can record the instantaneous action signal of the alarm dry contact. Even if the equipment is shut down, the fault signal issued before the shutdown will not be lost and will be kept. The staff can perform more comprehensive maintenance on the equipment according to the alarm situation of the device, handle the fault in time, avoid the recurrence of the fault after the equipment is restarted, reduce the start-stop frequency of the equipment, and extend the service life of the equipment.

[0017] The design idea of ​​the utility model is to record the instantaneous action signal of the on-site alarm dry contact. When the equipment malfunctions or fails, a judgment can be made quickly through this device, which greatly shortens the troubleshooting time, facilitates the staff to make more targeted maintenance and repair measures, and improves the repair efficiency.

[0018] See also Figure 1 and Figure 2 The utility model includes a power supply, a reset button SB and at least one diagnostic unit, wherein the power supply includes a power selection conversion switch SA and a DC 24V switching power supply KD, which is used to provide a 24V DC voltage to the diagnostic unit. The DC voltage can be directly provided by an external DC power supply, or provided by an external AC power supply and a DC 24V switching power supply KD. The switching power supply KD converts the AC voltage of the AC power supply into a 24V DC voltage for use by the diagnostic unit. The two power supply modes are switched by the power selection conversion switch SA; each diagnostic unit includes a fault detection device with an alarm dry contact, a relay, a pulse counter and a fault indicator light, the control coil of the relay is connected to the power supply through the alarm dry contact of the fault detection device, the normally open main contact of the relay is connected in parallel to the alarm dry contact of the fault detection device, the fault indicator light is connected to the power supply through the normally open auxiliary contact of the relay, and the voltage at both ends of the fault indicator light is connected to the pulse signal input end of the pulse counter.

[0019] The power supply supplies power to each diagnostic unit through the normally closed contact of the reset button SB. The fault indicator light is reset by pressing the reset button SB. At the same time, the pulse counter itself has a reset button for clearing operations.

[0020] Figure 1 There are three diagnostic units in total. The first diagnostic unit includes the first relay KA1, the first fault indicator light HL1, the first pulse counter T1 and the first alarm dry contact K1; the second diagnostic unit includes the second relay KA2, the second fault indicator light HL2, the second pulse counter T2 and the second alarm dry contact K2; the third diagnostic unit includes the third relay KA3, the third fault indicator light HL3, the third pulse counter T3 and the third alarm dry contact K3.

[0021] The utility model has two main functions:

[0022] 1. AC / DC power supply selection

[0023] like Figure 1 and Figure 2 As shown, connect the external power supply to the power terminal block X2 (including X2-1 terminal and X2-2 terminal). According to the actual power supply on site, match and select through the power selection switch SA, providing two options: AC 220V and DC 24V.

[0024] 2. Use this device to diagnose electrical equipment faults

[0025] like Figure 1 and Figure 2 As shown, this embodiment sets three diagnostic units, provides three-way alarm dry contact instantaneous action signal monitoring function, connects the external alarm dry contact to the detection terminal block X1, and the X1-1 terminal and X1-2 terminal in the detection terminal block X1 are the first monitoring circuit (corresponding to the first diagnostic unit), the X1-3 terminal and X1-4 terminal are the second monitoring circuit (corresponding to the second diagnostic unit), and the X1-5 terminal and X1-6 terminal are the third monitoring circuit (corresponding to the third diagnostic unit).

[0026] The working principle of the utility model is as follows:

[0027] Figure 1 In the example, when the first alarm dry contact K1 is activated, the first relay KA1 inside the device is energized and energized, and cooperates with the normally open main contact KA11 of the first relay to form a self-locking circuit. At the same time, the normally open auxiliary contact KA12 of the first relay is closed, and the first fault indicator HL1 changes from off to normally on, indicating that the circuit connected to the first diagnostic unit has a fault, prompting the on-site staff to have a fault. The pulse signal of the first pulse counter T1 is energized to add one operation, and the number of times the fault occurs is recorded. The working principle of the second and third diagnostic units is the same.

[0028] Taking the temperature detection device as an example, there is a relay alarm dry contact inside the temperature detection device that provides an alarm signal to the outside. When the temperature exceeds the set upper limit, the alarm dry contact will operate. Figure 1 and Figure 2As shown, a set of normally open dry contacts of the temperature detection device is connected to the X1-1 terminal and X1-2 terminal of the detection terminal block X1, and the first diagnostic unit is used. The external power supply is connected to the X2-1 terminal and X2-2 terminal of the power terminal block X2. The initial state of the power selection switch SA is in the middle 0 position. If the external power supply is AC220V, the power selection switch SA is turned to the left 1 position, and the power supply is powered by the DC 24V switching power supply KD. If the external power supply is DC24V, the power selection switch SA is turned to the right 2 position, and the device is directly powered by the external 24V power supply. When the temperature exceeds the set value, the relay alarm dry contact (first alarm dry contact K1) inside the temperature detection device is closed, the first relay KA1 is energized, and the normally open main contact KA11 of the first relay is energized to form a self-locking circuit. The normally open auxiliary contact KA12 of the first relay is energized, the first fault indicator HL1 becomes always on, the pulse signal input end of the first pulse counter T1 is energized, and the counter increases by one. When the temperature drops to the set alarm value, the first alarm dry contact K1 is disconnected. Since a self-locking circuit is formed, the first fault indicator light HL1 will not go out, reminding the staff that the fault has occurred. After the fault is handled or recorded, the reset button SB is pressed to disconnect the self-locking circuit and turn off the first fault indicator light HL1.

[0029] The other diagnostic units can be used in the same way, and the three diagnostic units can be used simultaneously. When the device is not in use, the power selection switch SA needs to be turned from the left position 1 or the right position 2 to the middle position 0 to completely cut off the power to the device.

[0030] The pulse counter has a reset button, which can be pressed to reset it to zero. When a diagnostic unit is connected to other diagnostic objects, the pulse counter can start counting from zero.

Claims

1. An electrical fault diagnosis device, characterized in that: It includes a power supply and a diagnostic unit, wherein the diagnostic unit includes a fault detection device with an alarm dry contact, a relay and a fault indicator light, the control coil of the relay is connected to the power supply through the alarm dry contact of the fault detection device, the normally open main contact of the relay is connected in parallel to the alarm dry contact of the fault detection device, and the fault indicator light is connected to the power supply through the normally open auxiliary contact of the relay.

2. An electrical fault diagnosis device according to claim 1, characterized in that: The diagnosis unit also includes a pulse counter, and the voltage at both ends of the fault indicator light is connected to the pulse signal input end of the pulse counter.

3. An electrical fault diagnosis device according to claim 2, characterized in that: The diagnosis units are provided in plurality and are connected in parallel.

4. An electrical fault diagnosis device according to claim 3, characterized in that: It also includes a reset button (SB), and the plurality of diagnostic units are connected to the power supply via a normally closed contact of the reset button (SB).

5. An electrical fault diagnosis device according to claim 4, characterized in that: The power supply includes a power selection switch (SA) and a switching power supply (KD). The external power supply directly supplies power to the diagnostic unit through the power selection switch (SA) or sequentially supplies power to the diagnostic unit through the power selection switch (SA) and the switching power supply (KD).

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