CN210015167U - Circuit device for online measurement of insulation of winding of submersible motor to ground - Google Patents
Circuit device for online measurement of insulation of winding of submersible motor to ground Download PDFInfo
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- CN210015167U CN210015167U CN201920198464.6U CN201920198464U CN210015167U CN 210015167 U CN210015167 U CN 210015167U CN 201920198464 U CN201920198464 U CN 201920198464U CN 210015167 U CN210015167 U CN 210015167U
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Abstract
The utility model relates to a circuit arrangement for on-line measurement of insulation of winding of a submersible motor to ground, which comprises a detection circuit, wherein the detection circuit comprises a detection power supply, a coil of an intermediate relay, a PLC processor, a human-computer interface, a first resistor, a second resistor and a resistor to be detected which are connected in series, the detection power supply is electrically connected with the coil of the intermediate relay respectively, the first resistor, the second resistor and the resistor to be detected are connected with the coil of the intermediate relay in parallel, the PLC processor is connected with two ends of the first resistor, and the human-computer interface is connected with the PLC processor; the control circuit comprises a coil of the alternating current contactor and a normally closed contact of the intermediate relay which are connected in series; and the main circuit comprises a normally open contact of the alternating current contactor and a three-phase motor, and the resistance to be detected is the resistance value between the motor winding and the motor shell. The utility model discloses can the on-line measuring three-phase machine to ground insulating, convenient operation.
Description
Technical Field
The utility model relates to a motor insulation detects the field, especially relates to an on-line measuring dive motor winding is to ground insulating circuit arrangement.
Background
The quality of the insulation of the motor winding is related to the performance of the motor, and the safety of the motor and the personal safety. The new motor must be monitored for insulation performance after manufacture is complete to determine if the motor meets design requirements. On the other hand, the insulation performance of the motor is also reduced after the motor is used for a period of time, so that the motor must be stopped to detect the insulation of the motor. The submersible motor is often submerged in water when in use, so that the insulation performance of the submersible motor is higher than that of a conventional motor.
Typically, detecting motor insulation must be done off-line using specialized instrumentation. Commonly used detection instruments are megohmmeters and motor winding insulation detectors, and the use of the instruments is required to be stopped, disconnected from a motor power supply and even carried out in a workshop. For the submersible motor to normally operate underwater, in order to detect the ground insulation, the submersible motor needs to be stopped, moved out of the water surface and detected, the whole process needs long operation time, the fluid transmission of a user is inevitably influenced, certain loss is brought to the user, in addition, the detection result needs manual intervention, and the maintenance needs to be carried out when the insulation does not meet the requirement; if the insulation meets the requirement, a signal cannot be fed back to the control system to start up immediately, and the motor can only be operated by manually reinstalling the motor and connecting the wire.
Disclosure of Invention
An object of the utility model is to provide an on-line measuring dive motor winding is to insulating circuit arrangement to solve the problem that provides among the above-mentioned background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a circuit device for measuring insulation of a winding of a submersible motor to the ground on line comprises a detection circuit, wherein the detection circuit comprises a detection power supply, a first resistor, a second resistor, a resistor to be detected, a coil of an intermediate relay, a detection switch, a PLC (programmable logic controller) processor and a human-computer interface, the detection power supply is electrically connected with the detection switch and the coil of the intermediate relay respectively, the detection switch is electrically connected with the coil of the intermediate relay, the first resistor, the second resistor and the resistor to be detected are connected in series, the first resistor, the second resistor and the resistor to be detected are connected with the coil of the intermediate relay in parallel, the PLC processor is connected with two ends of the first resistor, and the human-computer interface is connected with the PLC processor; the control circuit comprises a coil of an alternating current contactor and a normally closed contact of an intermediate relay, wherein the coil of the alternating current contactor and the normally closed contact of the intermediate relay are connected in series; the main circuit comprises a normally open contact of the alternating current contactor and a three-phase motor, the normally open contact of the alternating current contactor is electrically connected with the three-phase motor, and the resistance to be detected is the resistance between the motor winding and the motor shell.
Further, the detection power supply is a 24V direct current power supply.
Further, the resistance value of the first resistor is 0.5M ohm, and the resistance value of the second resistor is 0.7M ohm.
The utility model has the advantages that: the circuit device for measuring the insulation of the winding of the submersible motor to the ground on line can detect the insulation of the three-phase motor to the ground on line, cut the three-phase motor into the running state at any time, is convenient to operate and saves the maintenance and running cost.
Drawings
The figures further illustrate the invention, but the embodiments in the figures do not constitute any limitation of the invention.
Fig. 1 is a schematic structural diagram of the detection circuit of the present invention;
FIG. 2 is a schematic diagram of a main circuit;
fig. 3 is a schematic structural diagram of a control circuit according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1-3, an embodiment of the present invention provides a circuit device for measuring insulation of a winding of a submersible motor to ground on line, which includes a detection circuit, a control circuit and a main circuit. The detection circuit comprises a detection power supply 1, a first resistor 2, a second resistor 3, a resistor 4 to be detected, a coil 5 of an intermediate relay, a detection switch 6, a PLC (programmable logic controller) processor 7 and a human-computer interface 8, wherein the PLC processor is used for detecting voltage at two ends of the first resistor 2. The detection power supply 1 is a 24V direct current power supply. The resistance value of the first resistor 2 is 0.5M ohm, the resistance value of the second resistor 3 is 0.7M ohm, and the resistance value range of the resistor 4 to be tested can be from 0 to infinite ohm. The detection power supply 1 respectively with detection switch 6 with 5 electric connection of intermediate relay's coil, first resistance 2 second resistance 3 with the resistance 4 that awaits measuring establishes ties, just first resistance 2 second resistance 3 with the resistance 4 that awaits measuring follows intermediate relay's coil 5 is parallelly connected.
As shown in fig. 1 to 3, the PLC processor 7 is connected to two ends of the first resistor 2, the human-machine interface 8 is connected to the PLC processor 7, the voltage across the first resistor 2 is led to the analog input end of the PLC processor 7, and the PLC processor 7 measures the voltage U1 across the first resistor 2. And the PLC 7 sends the calculated resistance value of the resistor 4 to be tested to the human-computer interface 8, and the human-computer interface 8 displays the numerical value. In one embodiment, the control circuit comprises a motor normally open switch 17, a normally open auxiliary contact 9 of an alternating current contactor, a coil 10 of the alternating current contactor and a normally closed contact 11 of an intermediate relay, the motor normally open switch 17, the coil 10 of the alternating current contactor and the normally closed contact 11 of the intermediate relay are connected in series, the normally open auxiliary contact 9 of the alternating current contactor is connected with the motor normally open switch 17 in parallel, when the motor normally open switch 17 is pressed and connected in parallel, the coil 10 of the alternating current contactor is powered on, the normally open auxiliary contact 9 of the alternating current contactor is closed, the coil 10 of the alternating current contactor is powered on continuously, in other embodiments, the control circuit can also comprise a common circuit structure for controlling the forward and reverse rotation of the motor, a common circuit structure for controlling the on and off of a lamp and the like besides the coil 10 of the alternating current contactor and the normally closed contact 11 of the intermediate, the utility model discloses only describe one of them embodiment, other embodiments are no longer repeated. The main circuit comprises a three-phase power supply 12, a circuit breaker 13, a normally open contact 14 of an alternating current contactor, a thermal relay 15 and a three-phase motor 16, wherein the circuit breaker 13 is connected with the three-phase power supply 12, the normally open contact 14 of the alternating current contactor is connected with the circuit breaker 13, the thermal relay 15 is connected with the normally open contact 14 of the alternating current contactor, the thermal relay 15 is electrically connected with the three-phase motor 16, and a resistor 4 to be tested is a resistance value between a motor winding and a motor shell.
As shown in fig. 1-3, one end of the resistor 4 to be tested away from the second resistor 3 is set as a C3 end, one end of the first resistor 2 away from the second resistor 3 is set as a T0 end, in an actual operation process, the detection switch 6 is pressed first, after the detection switch 6 is closed, the detection power supply 1 applies 24V direct current to the C3 end and the T0 end, at the same time, the coil 5 of the intermediate relay is powered on, the normally closed contact 11 of the intermediate relay is opened, the control circuit is powered off, the coil 10 of the alternating current contactor is powered off, the main circuit is powered off, the three-phase motor 16 starts to stop rotating, and safety of a detection process is ensured. According to the voltage division principle in the direct current circuit, the sum of the voltages of the first resistor 2, the second resistor 3 and the resistor 4 to be tested is 24V, since the resistance range of the resistor 4 to be tested is 0 to infinite ohm, and the voltages at two ends of the resistor 4 to be tested are 0 to 24V, the sum of the voltages of the first resistor 2 and the second resistor 3 is 24 to 0V, the resistance of the first resistor 2 is set to be R1, the resistance of the second resistor 3 is set to be R2, the resistance of the resistor 4 to be tested is Rx, and U1 and U11 are respectively the maximum values of the voltage and the voltage of the first resistor 2, and the following formula is provided:
U1/R1=24/(R1+ R2+ Rx), i.e. U1/0.5=24(0.5+0.7+ Rx), resulting in Rx =12/U1-1.2 ①
U11/R1=24/(R1+ R2), i.e. U11/0.5=24(0.5+0.7), resulting in U11=10V, so U1 is 0-10V ②
① shows that the PLC processor 7 can calculate the resistance Rx of the resistor 4 to be measured by measuring the voltage U1 value, thereby obtaining the ground insulation performance of the motor, ② shows that the voltage range of U1 is matched with the analog quantity input range of the PLC processor 7.
The PLC processor 7 measures the voltage at the two ends of the first resistor 2, calculates the resistance of the resistor 4 to be measured according to an algorithm, and sends the calculated resistance of the resistor 4 to be measured to the human-computer interface 8 for display, which are all known to those skilled in the art. The utility model discloses can the on-line measuring three phase motor 16 insulating to cut into running state, convenient operation with three phase motor 16 at any time, thereby practiced thrift maintenance and running cost.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (3)
1. A circuit device for measuring insulation of a winding of a submersible motor to the ground on line is characterized by comprising:
the detection circuit comprises a detection power supply, a first resistor, a second resistor, a resistor to be detected, a coil of an intermediate relay, a detection switch, a PLC (programmable logic controller) processor and a human-computer interface, wherein the detection power supply is respectively electrically connected with the detection switch and the coil of the intermediate relay, the detection switch is electrically connected with the coil of the intermediate relay, the first resistor, the second resistor and the resistor to be detected are connected in series, the first resistor, the second resistor and the resistor to be detected are connected with the coil of the intermediate relay in parallel, the PLC processor is connected with two ends of the first resistor, and the human-computer interface is connected with the PLC processor;
the control circuit comprises a coil of an alternating current contactor and a normally closed contact of an intermediate relay, wherein the coil of the alternating current contactor and the normally closed contact of the intermediate relay are connected in series;
the main circuit comprises a normally open contact of the alternating current contactor and a three-phase motor, the normally open contact of the alternating current contactor is electrically connected with the three-phase motor, and the resistance to be detected is the resistance between the motor winding and the motor shell.
2. The circuit arrangement for on-line measurement of insulation of a winding of a submersible motor to ground as claimed in claim 1, wherein: the detection power supply is a 24V direct current power supply.
3. The circuit arrangement for on-line measurement of insulation of a winding of a submersible motor to ground as claimed in claim 1, wherein: the resistance value of the first resistor is 0.5M ohm, and the resistance value of the second resistor is 0.7M ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920198464.6U CN210015167U (en) | 2019-02-14 | 2019-02-14 | Circuit device for online measurement of insulation of winding of submersible motor to ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920198464.6U CN210015167U (en) | 2019-02-14 | 2019-02-14 | Circuit device for online measurement of insulation of winding of submersible motor to ground |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210015167U true CN210015167U (en) | 2020-02-04 |
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ID=69312780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920198464.6U Active CN210015167U (en) | 2019-02-14 | 2019-02-14 | Circuit device for online measurement of insulation of winding of submersible motor to ground |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210015167U (en) |
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2019
- 2019-02-14 CN CN201920198464.6U patent/CN210015167U/en active Active
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