CN217112581U - Motor insulation resistance and leakage current's on-line monitoring device - Google Patents
Motor insulation resistance and leakage current's on-line monitoring device Download PDFInfo
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- CN217112581U CN217112581U CN202220350759.2U CN202220350759U CN217112581U CN 217112581 U CN217112581 U CN 217112581U CN 202220350759 U CN202220350759 U CN 202220350759U CN 217112581 U CN217112581 U CN 217112581U
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Abstract
The embodiment of the specification provides an online monitoring device for insulation resistance and leakage current of a motor, and the device realizes offline and online automatic monitoring of the insulation resistance and the leakage current of the motor, wherein the device comprises: the circuit breaker with the auxiliary contact function, the high-voltage isolation resistor network, the leakage current sensor, the insulation monitor host, the temperature transmitter and the background insulation comprehensive management system; wherein, circuit breaker, high voltage isolation resistance network, leakage current sensor and temperature transmitter with auxiliary contact function all with the insulation monitor host computer is connected, the leakage current sensor cover is established on the three-phase incoming line of monitored motor, the insulation monitor host computer with the insulating integrated management system in backstage is connected to need great human input when solving the fault prevention measure who carries out insulation test to the motor, and can influence the problem of production activity.
Description
Technical Field
This document relates to electrical engineering technical field, especially relates to a motor insulation resistance and leakage current's on-line monitoring device.
Background
The insulation aging of the motor winding is one of the main reasons causing the motor failure, and the motor needs to be subjected to insulation test regularly because the unplanned shutdown caused by the industrial motor failure can cause great economic loss or serious results. At present, the preventive measures for the faults are to regularly use a megger to perform insulation test on the winding of the motor, or to perform online monitoring on the insulation condition of the motor through a partial discharge detection device. The insulation test using the megger depends on manual operation, the motor is required to be in a shutdown state, and the corresponding area must be completely powered off to ensure personal safety, so that great labor input is required, and production activity can be influenced. The insulation aging can cause partial discharge, the intensity of the partial discharge is larger the more the insulation aging is serious, and the device can obtain the intensity information of the partial discharge by capturing and measuring a high-frequency signal generated by the partial discharge so as to estimate the insulation aging condition of the winding. However, the partial discharge signal is very weak in the medium and low voltage motor, the detection device is very easily interfered, and the real partial discharge signal is very difficult to discriminate due to too many interference sources of nearby fluorescent lamps, electric welding, electric drills, communication radio stations and the like.
SUMMERY OF THE UTILITY MODEL
One or more embodiments of the present specification provide an online monitoring apparatus of insulation resistance and leakage current of a motor, including: the system comprises a circuit breaker with an auxiliary contact function, a high-voltage isolation resistance network, a leakage current sensor, a monitored motor, an insulation monitor host, a temperature transmitter and a background insulation comprehensive management system; the circuit breaker, the high-voltage isolation resistance network, the leakage current sensor and the temperature transmitter with the auxiliary contact function are all connected with the insulation monitor host, the leakage current sensor sleeve is arranged on a three-phase incoming line of the monitored motor, and the insulation monitor host is connected with the background insulation comprehensive management system.
Further, the insulation monitor host computer includes: the device comprises a wiring terminal, a high-voltage direct current generator, a signal conditioning circuit, an analog-to-digital conversion circuit, an information processing circuit, a communication circuit, an alarm output circuit, a keyboard and a display; the wiring terminal is connected with the signal conditioning circuit, the signal conditioning circuit is connected with the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected with the information processing circuit, the information processing circuit is respectively connected with the communication circuit, the alarm output circuit, the keyboard and the display, and the high-voltage direct-current generator is respectively connected with the information processing circuit and the signal conditioning circuit and used for connecting the generated high-voltage direct-current power supply into the signal conditioning circuit according to the control of the information processing circuit.
Further, the monitored motor is connected with the power grid through the circuit breaker with the auxiliary contact function.
Furthermore, the high-voltage isolation resistor network comprises three high-voltage resistors with the same resistance, the input ends of the three high-voltage resistors are respectively connected with the three-phase inlet wire of the monitored motor, and the output ends of the three high-voltage resistors are connected with the insulation monitor host in parallel.
Furthermore, the insulation monitor host and the shell of the monitored motor are provided with grounding wires.
Further, a temperature sensing probe of the temperature transmitter is fixed in a winding of the monitored motor.
Further, the leakage current sensor is a high-sensitivity anti-interference current sensor.
Further, the temperature transmitter is a 4-20 mA current output type temperature transmitter, and the measuring range is-40-100 ℃.
Furthermore, the input range of the analog-to-digital conversion circuit is 0-5V, and the conversion resolution is 24 bits.
The utility model has the advantages that the winding insulation resistance value to the ground, the absorption ratio and the polarization index can be measured remotely and automatically before the motor is started; the earth leakage value of the motor winding can be continuously monitored when the motor works; the temperature value of the motor winding or the shell is continuously and uninterruptedly measured, so that automation and real-time monitoring of motor insulation monitoring and temperature monitoring are realized, complicated manual operation is avoided, labor input is reduced, and the influence of shutdown maintenance on production activities is reduced; insulation degradation phenomena of the motor winding can be found in time, and automation and predictability of motor insulation management are facilitated; leakage current in milliampere can be measured; the measurement of the insulation resistance value, the leakage current value and the temperature value is more accurate.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present specification, and that other drawings can be obtained by those skilled in the art without inventive exercise.
Fig. 1 is a schematic structural view of an online monitoring device for motor insulation resistance and leakage current according to an embodiment of the present invention;
fig. 2 is the utility model discloses an on-line monitoring device insulation detector host computer structure sketch map of motor insulation resistance and leakage current.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in one or more embodiments of the present disclosure, the technical solutions in one or more embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in one or more embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all embodiments. All other embodiments that can be derived by a person skilled in the art from one or more of the embodiments described herein without making any inventive step shall fall within the scope of protection of this document.
Example 1
The utility model provides a motor insulation resistance and leakage current's on-line monitoring device, figure 1 is the utility model discloses a motor insulation resistance and leakage current's on-line monitoring device schematic structure, as shown in figure 1, the utility model discloses motor insulation resistance and leakage current's on-line monitoring device includes: the circuit breaker 100 with the auxiliary contact function, the high-voltage isolation resistance network 200, the leakage current sensor 300, the monitored motor 400, the insulation monitor host 500, the temperature transmitter 600 and the background insulation comprehensive management system 700; the circuit breaker 100 with the auxiliary contact function, the high-voltage isolation resistor network 200, the leakage current sensor 300 and the temperature transmitter 600 are all connected with the insulation monitor host 500, the leakage current sensor 300 is sleeved on a three-phase incoming line of the monitored motor 400, the insulation monitor host 500 is connected with the background insulation comprehensive management system 700, and the monitored motor 400 is connected with a power grid through the circuit breaker 100 with the auxiliary contact function.
The high-voltage isolation resistor network 200 includes three high-voltage resistors with the same resistance value, and the high-voltage resistor with the resistance value of 45M Ω is usually selected, the input ends of the three high-voltage resistors are respectively connected with the three-phase incoming line of the monitored motor 400, and the output ends of the three high-voltage resistors are connected with the insulation monitor host 500 after being connected in parallel.
The insulation monitor main unit 500 and the casing of the monitored motor 400 are both provided with grounding wires.
The temperature sensing probe of temperature transmitter 600 is secured in the windings of monitored motor 400.
Fig. 2 is the utility model discloses an on-line monitoring device insulation detector host computer schematic structure of motor insulation resistance and leakage current, as shown in fig. 2, insulation monitor host computer 500 includes: the device comprises a wiring terminal 501, a high-voltage direct current generator 502, a signal conditioning circuit 503, an analog-to-digital conversion circuit 504, an information processing circuit 505, a communication circuit 506, an alarm output circuit 507 and a keyboard and display 508; the wiring terminal 501 is connected with the signal conditioning circuit 503, the signal conditioning circuit 503 is connected with the analog-to-digital conversion circuit 504, the analog-to-digital conversion circuit 504 is connected with the information processing circuit 505, the information processing circuit 505 is respectively connected with the communication circuit 506, the alarm output circuit 507, and the keyboard and the display 508 are used for changing the alarm threshold value by operating the information processing circuit 505; the high voltage dc generator 502 is respectively connected to the information processing circuit 505 and the signal conditioning circuit 503, and is configured to switch the generated high voltage dc power into the signal conditioning circuit 503 according to the control of the information processing circuit 505.
The signal conditioning circuit 503 converts the current signal flowing through the high-voltage isolation resistor into a voltage signal of 0-4.096V, the signal conditioning circuit 503 converts the secondary coil current signal of the leakage current sensor 300 into a voltage signal of 0-4.096V, and the signal conditioning circuit 503 converts the current signal of the temperature transmitter 600 into a voltage signal of 0-4.096V.
The specification of the high voltage dc voltage generated by the high voltage dc generator 502 includes 500V, 1000V, 1500V, 2000V and 2500V, which is determined according to the voltage class of the motor 400 to be monitored.
In one or more embodiments, leakage current sensor 300 is a high sensitivity, interference-free leakage current sensor with a current transformation ratio of 1000mA:2 mA; the temperature transmitter 600 is a 4-20 mA current output type temperature transmitter with the measuring range of-40-100 ℃. The input range of the analog-to-digital conversion circuit 504 is 0-5V, the highest sampling rate is 128kSPS, and the conversion resolution is 24 bits.
In one or more embodiments, the temperature sensing probe of temperature transmitter 600 can also be secured to the housing of monitored motor 400.
In one or more embodiments, the high voltage isolation resistor network 200 is connected to the monitored motor 400 through a cable, or may be directly connected to the monitored motor 400 through a junction box.
The working principle of the utility model is as follows:
when the circuit breaker 100 with the auxiliary contact function is in a switching-off state, a high-voltage direct-current generator 502 in the insulation detector host generates a 1500-volt direct-current voltage signal, the direct-current voltage signal passes through a signal conditioning circuit 503, then passes through a wiring terminal 501, then is connected to a stator winding of the monitored motor 400 through a high-voltage isolation resistor network 200, the signal conditioning circuit 503 senses a current signal on a direct-current voltage signal path, the value of the current signal is measured through an analog-to-digital conversion circuit 504 and an information processing circuit 505, and the insulation resistance value of the stator winding of the monitored motor 400 to a machine shell is calculated according to an ohm law R & ltu/I & gt;
when the circuit breaker 100 with the auxiliary contact function is in a closing state, the high-voltage direct current generator 502 does not work;
when the circuit breaker 100 with the auxiliary contact function is in a closed state, three-phase alternating-current voltage of a power grid is applied to a stator winding of the monitored motor 400, the leakage current sensor 300 senses a leakage current signal of the stator winding of the monitored motor 400 to the ground, the leakage current signal is connected to the signal conditioning circuit 503 through the wiring terminal 501, and the value of the leakage current signal is measured through the analog-to-digital conversion circuit 504 and the information processing circuit 505;
the temperature transmitter 600 converts the winding temperature or the casing temperature of the monitored motor 400 into a current signal, and the current signal is connected to the signal conditioning circuit 503 through the wiring terminal 501, and the temperature value of the winding or the casing of the monitored motor 400 is measured through the analog-to-digital conversion circuit 504 and the information processing circuit 505;
the information processing circuit 505 transmits all the measurement results to the background insulation integrated management system 700 through the communication circuit 506;
the information processing circuit 505 checks all the measurement results, and when any measurement result reaches or exceeds the alarm threshold value, sends an alarm signal to the background monitoring and management system 700 through the alarm output circuit 507;
the information processing circuit 505 displays all the measurement results in an intuitive manner through the keyboard and the display 508.
The keypad and display 508 changes the alarm threshold value by operating the information processing circuit 505.
Compared with the prior art, the beneficial effects of the utility model are that: the insulation resistance value to the ground, the absorption ratio and the polarization index of the winding of the motor can be measured remotely in a shutdown state, the leakage current value to the ground of the winding can be measured continuously in the running process, and the temperature value of the motor can be measured continuously no matter the motor is in the shutdown state or the running state, so that the complicated manual operation can be avoided, the human input is reduced, and the influence of shutdown maintenance on the production activity is reduced; no matter the motor to be monitored is in a shutdown or running state, the insulation degradation phenomenon of the motor winding can be found in time; the leakage current of milliampere level can be measured by adopting a high-sensitivity anti-interference leakage current sensor; the sampling rate of the adopted analog-digital conversion circuit can reach 128kSPS at most, the conversion resolution is 24 bits, and the measurement of the insulation resistance value, the leakage current value and the temperature value is more accurate.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. The utility model provides an online monitoring device of motor insulation resistance and leakage current which characterized in that includes: the system comprises a circuit breaker (100) with an auxiliary contact function, a high-voltage isolation resistor network (200), a leakage current sensor (300), a monitored motor (400), an insulation monitor host (500), a temperature transmitter (600) and a background insulation comprehensive management system (700); wherein, circuit breaker (100), high voltage isolation resistance network (200), leakage current sensor (300) and temperature transmitter (600) with auxiliary contact function all with insulating monitor host computer (500) are connected, leakage current sensor (300) cover is established on advancing on the line by the three-phase of monitoring motor (400), insulating monitor host computer (500) with backstage insulation integrated management system (700) are connected.
2. The on-line motor insulation resistance and leakage current monitoring device according to claim 1, wherein the insulation monitor main unit comprises: the device comprises a wiring terminal (501), a high-voltage direct current generator (502), a signal conditioning circuit (503), an analog-to-digital conversion circuit (504), an information processing circuit (505), a communication circuit (506), an alarm opening circuit (507) and a keyboard and display (508); the wiring terminal (501) is connected with the signal conditioning circuit (503), the signal conditioning circuit (503) is connected with the analog-to-digital conversion circuit (504), the analog-to-digital conversion circuit (504) is connected with the information processing circuit (505), the information processing circuit (505) is respectively connected with the communication circuit (506), the alarm opening circuit (507), the keyboard and the display (508), and the high-voltage direct-current generator (502) is respectively connected with the information processing circuit (505) and the signal conditioning circuit (503) and is used for accessing the generated high-voltage direct-current power supply to the signal conditioning circuit (503) according to the control of the information processing circuit (505).
3. The on-line motor insulation resistance and leakage current monitoring device according to claim 1, characterized in that the monitored motor (400) is connected to the grid through the circuit breaker (100) with auxiliary contact function.
4. The on-line monitoring device for the motor insulation resistance and the leakage current according to claim 1, wherein the high-voltage isolation resistor network (200) comprises three high-voltage resistors with the same resistance, the input ends of the three high-voltage resistors are respectively connected with a three-phase incoming line of the monitored motor (400), and the output ends of the three high-voltage resistors are connected with the insulation monitor main unit (500) after being connected in parallel.
5. The on-line motor insulation resistance and leakage current monitoring device according to claim 1, wherein the insulation monitor main unit (500) and the housing of the monitored motor (400) are provided with grounding wires.
6. The on-line monitoring device of motor insulation resistance and leakage current according to claim 1, characterized in that the temperature sensing probe of the temperature transmitter (600) is fixed in the winding of the monitored motor (400).
7. The on-line monitoring device for insulation resistance and leakage current of a motor according to claim 1, wherein the leakage current sensor (300) is a high-sensitivity anti-interference leakage current sensor.
8. The on-line monitoring device for the insulation resistance and the leakage current of the motor according to claim 1, wherein the temperature transmitter (600) is a 4-20 mA current output type temperature transmitter with a measuring range of-40-100 ℃.
9. The online monitoring device for the insulation resistance and the leakage current of the motor according to claim 2, wherein the input range of the analog-to-digital conversion circuit (504) is 0-5V, and the conversion resolution is 24 bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350759.2U CN217112581U (en) | 2022-02-21 | 2022-02-21 | Motor insulation resistance and leakage current's on-line monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350759.2U CN217112581U (en) | 2022-02-21 | 2022-02-21 | Motor insulation resistance and leakage current's on-line monitoring device |
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| Publication Number | Publication Date |
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| CN217112581U true CN217112581U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220350759.2U Active CN217112581U (en) | 2022-02-21 | 2022-02-21 | Motor insulation resistance and leakage current's on-line monitoring device |
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| CN (1) | CN217112581U (en) |
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