CN218629974U - Automatic inspection device for insulation resistance of standby motor - Google Patents
Automatic inspection device for insulation resistance of standby motor Download PDFInfo
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- CN218629974U CN218629974U CN202222120825.XU CN202222120825U CN218629974U CN 218629974 U CN218629974 U CN 218629974U CN 202222120825 U CN202222120825 U CN 202222120825U CN 218629974 U CN218629974 U CN 218629974U
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Abstract
The utility model discloses an automatic inspection device of stand-by motor insulation resistance, including carrying out the relay, the test generating line, insulation resistance tester and controller, the quantity of carrying out the relay is unanimous with the quantity of motor, every carries out the relay and includes a normally closed contact and a normally open contact, wherein, normally closed contact establishes ties on earthing switch's short-circuit grounding, normally open contact's one end is connected between earthing switch and normally closed contact, the test generating line is connected to normally open contact's the other end, insulation resistance tester connects between test generating line and earthing pole, coil and insulation resistance tester of each execution relay are connected respectively to the controller, thereby detection efficiency and security to stand-by motor insulation resistance have been improved.
Description
Technical Field
The application relates to the technical field of insulation resistance detection, in particular to an automatic inspection device for insulation resistance of a standby motor.
Background
Motors (including transformers) of generally high importance are of alternative design. I.e. only half of the equipment is in operation at any one time, while the other half of the same equipment is in standby.
According to the technical regulations, the insulation resistance of these backup motors must be checked periodically (for example weekly) to ensure that they are not wet and have a ready start condition.
In the prior art, the detection operation of the insulation resistance which is carried out regularly is complex, and certain safety risk is caused. For example, to make an inspection work application form, many technical documents need to be signed; one person is arranged to perform operation, and another person is required to monitor; the switch numbers need to be checked repeatedly to prevent a wrong interval; special tools are also used to open the rear cover plate of the tightly-protected switch cabinet.
Therefore, how to provide an automatic inspection device of spare motor insulation resistance improves detection efficiency and security is the technical problem that remains to be solved at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides an automatic inspection device of stand-by motor insulation resistance for carry out the insulation resistance to stand-by motor among the solution prior art and examine time measuring technical problem inefficiency, that the reliability is poor.
The device comprises execution relays, a test bus, an insulation resistance tester and a controller, wherein the number of the execution relays is consistent with that of the motors, each execution relay comprises a normally closed contact and a normally open contact, the number of the execution relays is equal to that of the motors, the normally closed contacts and the normally open contacts are arranged on the execution relays,
the normally closed contact is connected in series on earthing switch's short circuit earth connection, normally open contact's one end is connected earthing switch with between the normally closed contact, normally open contact's the other end is connected test bus, the insulation resistance tester is connected between test bus and the earthing pole, the controller is connected respectively each the coil of execution relay with the insulation resistance tester.
In some embodiments, the apparatus further includes an auxiliary contact, the auxiliary contact is mechanically linked to a grounding switch of the motor, the controller is connected to each of the auxiliary contacts, if the current motor is in a cold standby state, the power switch of the current motor is in an open state, the grounding switch of the current motor is in a closed state, and the auxiliary contact corresponding to the current motor is in a closed state.
In some embodiments, when the insulation resistance tester performs insulation resistance detection on the current motor, the current motor is in a cold standby state, and a coil of an execution relay corresponding to the current motor is in an energized state.
In some embodiments, after the insulation resistance tester detects the insulation resistance of the current motor for a preset time, the coil of the execution relay corresponding to the current motor is powered off.
In some embodiments, if the current motor is in a hot standby state or a running state, the auxiliary contact corresponding to the current motor is in an open state, and the coil of the execution relay corresponding to the current motor is in a power-off state.
In some embodiments, the controller is a PLC controller.
In some embodiments, the device further comprises an auxiliary contact point, the auxiliary contact point is mechanically linked with a grounding switch of the motor, the auxiliary contact point is connected with a switching value input end of the controller, a coil of the execution relay is connected with a common end of the controller, and the insulation resistance tester is connected with an analog value input end of the controller.
In some embodiments, the device further comprises an alarm device connected with the controller, and the alarm device sends out an alarm signal if the insulation resistance value of the current motor is smaller than the specified insulation resistance value.
In some embodiments, the device further comprises a display screen connected with the controller, and the display screen is used for human-computer interaction.
In some embodiments, the apparatus periodically performs insulation resistance tests on each motor at specified time intervals.
Through using above technical scheme, automatic inspection device of stand-by motor insulation resistance is including carrying out the relay, the test bus, insulation resistance tester and controller, the quantity of carrying out the relay is unanimous with the quantity of motor, every carries out the relay and includes a normally closed contact and a normally open contact, wherein, normally closed contact establishes ties on earthing switch's short circuit earth connection, normally open contact's one end is connected between earthing switch and normally closed contact, test bus is connected to normally open contact's the other end, insulation resistance tester connects between test bus and earthing pole, the coil and the insulation resistance tester of each execution relay are connected respectively to the controller, thereby detection efficiency and the security to stand-by motor insulation resistance have been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of an automatic inspection device for insulation resistance of a standby motor according to an embodiment of the present invention;
fig. 2 shows an electrical wiring diagram of the automatic inspection device for the insulation resistance of the standby motor in the embodiment of the invention;
fig. 3 is a schematic diagram showing the grounding condition of a motor without an automatic inspection device in the prior art.
In fig. 1-3, 1, an execution relay; 2. testing the bus; 3. an insulation resistance tester; 4. a motor; 5. a grounding switch; 6. a power switch; 7. short-circuit the ground wire; 8. auxiliary contacts.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides an automatic inspection device for insulation resistance of a standby motor, as shown in figure 1, the device comprises execution relays 1, a test bus 2, an insulation resistance tester 3 and a controller, the number of the execution relays 1 is consistent with that of motors 4, each execution relay 1 comprises a normally closed contact and a normally open contact, wherein,
the normally closed contact is connected in series with a short circuit grounding wire 7 of the grounding switch 5, one end of the normally open contact is connected between the grounding switch 5 and the normally closed contact, the other end of the normally open contact is connected with the test bus 2, the insulation resistance tester 3 is connected between the test bus 2 and a grounding electrode, and the controller is respectively connected with a coil of each execution relay 1 and the insulation resistance tester 3.
In this embodiment, as shown in fig. 1, when the grounding switch 5 is turned off and the power switch 6 is turned on, the motor 4 is in a running state; when the power switch 6 is disconnected and the grounding switch 5 is disconnected, the motor 4 is in a hot standby state; when the power switch 6 is open and the ground switch 5 is closed, the motor 4 is in a cold standby state.
The controller sequentially acquires the states of the grounding switches 5, if the grounding switch of the current motor is in a closed state, the current motor is in a cold standby state, insulation resistance detection can be performed, a coil of an execution relay corresponding to the current motor is controlled to be electrified, a normally closed contact is disconnected to disconnect a short-circuit grounding wire, a normally open contact is closed to connect the coil of the current motor and a test bus 2, and an insulation resistance tester 3 is started to perform insulation resistance detection on the current motor;
if the grounding switch of the current motor is in the off state, the current motor is not in the cold standby state, insulation resistance detection cannot be carried out, and the current motor is skipped over and the state of the next grounding switch 5 is obtained.
In fig. 1, 2 motors 4 are shown, two of which implement the wiring of the relay 1. In practical use, when there are more motors 4, the same number of execution relays 1 as the motors are needed, and the short-circuit grounding wire 7 is used for realizing the grounding function of the grounding switch 5 when insulation resistance measurement is not performed, as shown in fig. 3, a schematic diagram of the grounding condition of a motor without an automatic inspection device in the prior art is shown.
In order to accurately obtain the state of the grounding switch 5, in some embodiments of the present application, as shown in fig. 2, the apparatus further includes an auxiliary contact 8, the auxiliary contact 8 is in mechanical linkage with the grounding switch 5 of the motor 4, the controller is respectively connected to each auxiliary contact 8, if the current motor is in a cold standby state, the power switch of the current motor is in an open state, the grounding switch of the current motor is in a closed state, and the auxiliary contact corresponding to the current motor is in a closed state.
In this embodiment, the controller acquires the state of the ground switch 5 through each auxiliary contact 8, and those skilled in the art may use other methods according to actual needs to make the controller acquire the state of the ground switch 5, for example, the controller may also acquire the state from a DCS system, which does not affect the protection scope of this application.
In order to reliably perform insulation resistance detection, in some embodiments of the present application, when the insulation resistance tester 3 performs insulation resistance detection on the current motor, the current motor is in a cold standby state, and a coil of the execution relay corresponding to the current motor is in an energized state.
In this embodiment, when the current motor is in the cold standby state, the insulation resistance detection may be performed, the coil of the execution relay corresponding to the current motor is in the energized state, the normally open contact is closed to communicate the coil of the current motor and the test bus 2, and the normally closed contact is opened to disconnect the short-circuit ground wire.
For reliable insulation resistance detection, in some embodiments of the present application, after the insulation resistance detector 3 detects the insulation resistance of the current motor for a preset time, the coil of the execution relay corresponding to the current motor is powered off.
In this embodiment, after insulation resistance tester 3 carried out insulation resistance detection to current motor and reached to predetermineeing long time, insulation resistance detection accomplished, need with the coil outage of the executive relay that current motor corresponds, normally closed contact closure makes the short circuit earth connection put through again, normally open contact disconnection keeps apart the coil and the test bus 2 of current motor again, and then can carry out insulation resistance detection to other motors.
Optionally, the preset time period may be 60 seconds.
In order to ensure safety, in some embodiments of the present application, if the current motor is in a hot standby state or an operating state, the auxiliary contact corresponding to the current motor is in an off state, and the coil of the execution relay corresponding to the current motor is in an off state.
If the current motor is in a hot standby state or an operating state, insulation resistance detection cannot be performed, so that the auxiliary contact corresponding to the current motor is in a disconnected state, and the coil of the execution relay corresponding to the current motor is in a power-off state.
To improve the reliability of the device, in some embodiments of the present application, the controller is a PLC controller.
Those skilled in the art can use other types of controllers according to actual needs, which does not affect the scope of the present application.
In order to improve the reliability of the device, in some embodiments of the present application, as shown in fig. 2, the device further includes an auxiliary contact 8, the auxiliary contact 8 is mechanically linked with the grounding switch 5 of the motor 4, the auxiliary contact 8 is connected to the switching value input terminal DI of the controller, the coil of the actuator relay 1 is connected to the common terminal COM of the controller, and the insulation resistance tester 3 is connected to the analog value input terminal AI of the controller.
In order to enable a user to know whether insulation resistance detection is qualified or not in time, in some embodiments of the present application, the device further includes an alarm device connected with the controller, and if the insulation resistance value of the current motor is smaller than a specified insulation resistance value, the alarm device sends an alarm signal.
In order to facilitate the user to intuitively understand the measurement results and operate the device, in some embodiments of the present application, the device further comprises a display screen connected to the controller, the display screen being used for human-computer interaction.
To improve the reliability of the device, in some embodiments of the present application, the device periodically performs insulation resistance tests on each motor 4 at specified time intervals.
In this embodiment, the automatic inspection device for the insulation resistance of the standby motor can enter the dormant state after each inspection of each motor 4 is completed, and the standby motor can finish the dormancy and perform the next inspection after the dormancy reaches a specified time interval.
Through applying above technical scheme, compare with prior art, have following beneficial effect:
1) The automatic inspection device for the insulation resistance of the standby motor is simple and convenient to install and debug, and the number of motors detected in the same round can be expanded according to needs.
2) The rear cover plate of the high-voltage cabinet does not need to be disassembled, the detection process is automatically carried out, and the labor intensity of operators is greatly reduced.
3) The detection time coverage is good. Any time interval can be set to avoid postponing or forgetting detection.
4) The security is good, has avoided operating personnel to walk wrong electric shock risk that the interval leads to.
Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.
Claims (10)
1. An automatic inspection device for insulation resistance of a standby motor is characterized by comprising execution relays, a test bus, an insulation resistance tester and a controller, wherein the number of the execution relays is consistent with that of the motors, each execution relay comprises a normally closed contact and a normally open contact, the normally closed contacts are arranged on the normally closed contacts,
the normally closed contact is connected in series on earthing switch's short circuit earth connection, normally open contact's one end is connected earthing switch with between the normally closed contact, normally open contact's the other end is connected test bus, the insulation resistance tester is connected between test bus and the earthing pole, the controller is connected respectively each the coil of execution relay with the insulation resistance tester.
2. The apparatus of claim 1, further comprising auxiliary contacts mechanically coupled to the ground switch of the motor, wherein the controller is connected to each of the auxiliary contacts, and wherein if the current motor is in a cold standby state, the power switch of the current motor is in an open state, the ground switch of the current motor is in a closed state, and the auxiliary contact corresponding to the current motor is in a closed state.
3. The apparatus of claim 2, wherein the insulation resistance tester detects the insulation resistance of the current motor, the current motor is in a cold standby state, and a coil of the execution relay corresponding to the current motor is in an energized state.
4. The apparatus of claim 3, wherein the insulation resistance tester detects the insulation resistance of the current motor for a preset time period, and then the coil of the execution relay corresponding to the current motor is de-energized.
5. The apparatus of claim 2, wherein if the current motor is in a hot standby state or an operating state, the auxiliary contact corresponding to the current motor is in an open state, and the coil of the actuating relay corresponding to the current motor is in a power-off state.
6. The apparatus of claim 1, wherein the controller is a PLC controller.
7. The apparatus of claim 6, further comprising an auxiliary contact mechanically coupled to a ground switch of the motor, the auxiliary contact being connected to a switching input of the controller, the coil of the actuator relay being connected to a common terminal of the controller, the insulation resistance tester being connected to an analog input of the controller.
8. The apparatus of claim 1, further comprising an alarm device connected to the controller, the alarm device emitting an alarm signal if the insulation resistance value of the present motor is less than a designated insulation resistance value.
9. The apparatus of claim 1, further comprising a display screen coupled to the controller, the display screen for human-machine interaction.
10. The apparatus of claim 1, wherein the apparatus periodically performs insulation resistance tests on each of the motors at specified time intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222120825.XU CN218629974U (en) | 2022-08-11 | 2022-08-11 | Automatic inspection device for insulation resistance of standby motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222120825.XU CN218629974U (en) | 2022-08-11 | 2022-08-11 | Automatic inspection device for insulation resistance of standby motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218629974U true CN218629974U (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222120825.XU Active CN218629974U (en) | 2022-08-11 | 2022-08-11 | Automatic inspection device for insulation resistance of standby motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218629974U (en) |
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2022
- 2022-08-11 CN CN202222120825.XU patent/CN218629974U/en active Active
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