CN118501546A - Three-phase motor insulation resistance detection equipment - Google Patents

Abstract

The invention discloses a three-phase motor insulation resistance detection device, relates to the technical field of motor insulation resistance detection, comprises a detection device main body, and is provided with a detection end, a detection data acquisition end, a data analysis end, a standard resistance value acquisition end, a temperature range acquisition end, a three-phase deviation compensation coefficient acquisition end, and a compensation calculation end; the technical problem that the temperature of the three-phase motor insulation resistance detection device may cause an error in the detection of the three-phase insulation resistance of the motor; by obtaining the calculated three-phase insulation resistance value after error compensation when the motor is tested, the error in the insulation resistance of the motor caused by the temperature of the detection device itself is eliminated to a certain extent, more accurate data support is provided for the detection of the insulation resistance of the motor to eliminate the error caused by the temperature, and the accuracy and reliability of the motor detection result are improved.

Description

A three-phase motor insulation resistance detection device

Technical Field

The invention relates to the technical field of motor insulation resistance detection, and in particular to a three-phase motor insulation resistance detection device.

Background Art

Modern life is changing with each passing day. People cannot live without electricity for a moment. In the process of using electricity, there are motor safety issues. In the production and maintenance of electrical equipment, the motor is usually tested for insulation resistance to ensure the safe operation of the motor. The existing insulation resistance test usually uses a megohmmeter, which is connected to two test terminals, and the two test terminals are respectively connected to the two ends of the motor to test the insulation resistance of the motor.

The patent publication number CN219676139U discloses an insulation resistance detection alarm device for a high-voltage motor, including a base plate, a belt conveyor and an insulation resistance detection device body. The upper surface of the base plate is used to install the belt conveyor, a support frame is installed on the upper surface of the base plate, a cylinder is installed on the top of the support frame, and the output end of the cylinder passes through the through hole on the top of the support frame for installing the insulation resistance detection device body. The insulation resistance of the high-voltage motor is placed above the belt conveyor, and the resistance detection device body is driven to contact the insulation resistance through the drive of the cylinder. The positive detection rod and the negative detection rod on the resistance detection device body contact the positive and negative electrodes on the insulation resistance for detection. If the detection is unqualified, an alarm is sounded through an alarm light and the waste is collected into a waste box through a diverter plate or conveyed to the next step through a belt conveyor, thereby reducing the occurrence of repeated detection.

However, when the three-phase insulation resistance of the motor is detected by a three-phase motor insulation resistance detection device, it is not taken into account that the increase or decrease in the temperature of the three-phase motor insulation resistance detection device itself will cause the detection value of the three-phase insulation resistance of the motor to change, resulting in errors in the detection of the three-phase insulation resistance of the motor; based on this, a three-phase motor insulation resistance detection device is proposed.

Summary of the invention

The purpose of the present invention is to provide a three-phase motor insulation resistance detection device, which solves the technical problem that the temperature of the three-phase motor insulation resistance detection device may cause errors in the detection of the motor's three-phase insulation resistance.

The purpose of the present invention can be achieved through the following technical solutions:

A three-phase motor insulation resistance detection device comprises a detection device body, on which a detection terminal, a detection data acquisition terminal, a data analysis terminal, a standard resistance value acquisition terminal, a temperature range acquisition terminal, a three-phase deviation compensation coefficient acquisition terminal, and a compensation calculation terminal are arranged;

The detection end is used to measure the three phases UVW one by one in turn, and record the insulation resistance value of each phase, and at the same time record the temperature of the test equipment itself;

The detection data acquisition terminal is used to detect the temperature of the test device itself within the preset time T and the three-phase insulation resistance value T≥1 when the test device tests each motor;

At the data analysis end, a detection temperature sequence table and three-phase resistance detection values corresponding to each device temperature value are obtained according to the detection data;

The standard resistance value acquisition end analyzes the experimental data of multiple experimental motors to obtain the three-phase standard resistance corresponding to the testing equipment while keeping other factors of the testing equipment unchanged and at the rated equipment temperature;

A temperature range acquisition terminal is used to acquire multiple temperature ranges corresponding to the detection device according to the device temperature value in the detection temperature sequence table of the detection device;

The three-phase deviation compensation coefficient acquisition terminal is used to obtain the three-phase deviation compensation coefficients corresponding to each temperature range based on the three-phase resistance detection values corresponding to each device temperature value and the three-phase standard resistance corresponding to the detection device;

At the compensation calculation end, the calculated three-phase insulation resistance value corresponding to the motor is obtained through the real-time three-phase insulation resistance value and real-time temperature corresponding to the motor.

As a further solution of the present invention: the specific method of obtaining the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table is:

Through the detection temperature sequence table generating unit, the detection temperature sequence table corresponding to the test equipment is obtained according to the device temperature values of the test equipment within the preset time T and the duration corresponding to the device temperature values; then, the three-phase insulation resistance values of the test equipment when testing multiple motors at each device temperature value in the detection temperature sequence table are analyzed through the resistance detection value acquisition unit, so as to obtain the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table.

As a further solution of the present invention: the specific method of obtaining the detection temperature sequence table corresponding to the test equipment is:

Obtain the device temperature value whose duration corresponding to the device temperature value within the preset time T is greater than the preset value Y1, and mark it as and Aa, arrange Aa in ascending order according to the value, and then obtain the detection temperature sequence table corresponding to the test device, where a is the number of each device temperature value in the detection temperature sequence table, a≥1, and Y1 is the preset value.

As a further solution of the present invention: the specific method of obtaining the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table is:

S1: Randomly select a device temperature value from each device temperature value in the detection temperature sequence table as the target temperature.

S2: Obtain three-phase insulation resistance values when the test equipment tests multiple motors at the analysis temperature, and mark them as BA i, BB i, and BC i, respectively, where i is the number corresponding to the tested motors, i ≥ 1;

The three-phase resistance detection values CA1, CB1 and CC1 corresponding to the test equipment at the analysis temperature are calculated by the formulas (BA _max +BA _min )/2×θ1=CA1, (BB _max +BB _min )/2×θ2=CB1 and (BC _max +BC _min )/2×θ3=CC1, where BA _max , BB _max and BC _max are the maximum values corresponding to BA i, BB i and BC i, respectively, BA _min , BB _min and BC _min are the minimum values corresponding to BAi, BBi and BC i, respectively, and θ1, θ2 and θ3 are fixed coefficients;

S3: Repeat steps S1-S2 to obtain the three-phase resistance detection values CAa, CBa and CCa corresponding to each device temperature value.

As a further solution of the present invention: the specific method of obtaining the three-phase standard resistance corresponding to the detection device is:

The three-phase insulation resistance values of multiple experimental motors during the detection experiment are marked as DAj, DBj and DCj respectively, and the average values of DAj, DBj and DCj are marked as the three-phase standard resistances EA1, EB1 and EC1 corresponding to the detection equipment respectively, where j is the number corresponding to the experimental motor, j≥1.

As a further solution of the present invention: the specific method of obtaining multiple temperature intervals corresponding to the detection device is:

A temperature interval is generated by measuring each two adjacent device temperature values in the temperature sequence, and then r temperature intervals corresponding to the detection device are obtained, where r=a-1.

As a further solution of the present invention: the specific method of obtaining the three-phase deviation compensation coefficients corresponding to each temperature range of the detection device is:

S01: Mark the differences between the three-phase resistance detection values and the three-phase standard resistances corresponding to the temperature values of each device as the three-phase difference resistances FAa, FBa and FCa corresponding to the temperature values of each device;

S02: Use the temperature value of each device as the horizontal coordinate and the corresponding three-phase difference resistance FAa, FBa and FCa as the vertical coordinate to draw the temperature change curve corresponding to the detection device;

S03: According to the device temperature values corresponding to the two end points of each temperature interval and the three-phase difference resistances corresponding to each device temperature value, the slope between the two end points of each temperature interval is obtained by the slope formula, and is used as the three-phase deviation compensation coefficients XAr, XBr and XCr corresponding to each temperature interval.

As a further solution of the present invention: the specific method of obtaining the calculated three-phase insulation resistance value after error compensation when the motor is tested is:

When testing the motor, first obtain the real-time temperature SW corresponding to the testing equipment, then obtain the real-time three-phase insulation resistance value of the motor tested by the testing equipment, and mark them as HA, HB and HC respectively, obtain the three-phase deviation compensation coefficients L1, L2 and L3 corresponding to the temperature range corresponding to the real-time temperature SW, and substitute them into MA=(HA+|SW-ED|×L1)×θ1, MB=(HB+|SW-ED|×L2)×θ2 and MC=(HC+|SW-ED|×L3)×θ3 for calculation, and then obtain the calculated three-phase insulation resistance values MA, MB and MC after error compensation when the motor is tested, where ED is the rated equipment temperature corresponding to the testing equipment, and θ1, θ2 and θ3 are correction coefficients.

Beneficial effects of the present invention:

The present invention obtains the real-time three-phase insulation resistance value and the real-time temperature of the detection device when the detection device detects the motor, obtains the three-phase deviation compensation coefficient corresponding to the temperature range corresponding to the real-time temperature through the corresponding real-time temperature when the detection device detects the motor, and analyzes the three-phase insulation resistance value calculated after error compensation when the motor is tested, thereby eliminating the error of the motor insulation resistance caused by the temperature of the detection device itself to a certain extent, providing more accurate data support for the detection of the motor insulation resistance to eliminate the error caused by temperature, and improving the accuracy and reliability of the motor detection result.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings.

FIG1 is a schematic diagram of the system framework structure of the present invention;

FIG2 is a schematic diagram of the three-dimensional structure of the detection device of the present invention;

In the figure: 1. including the testing table; 2. the fixing frame; 3. the testing equipment body; 4. the display screen.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1

Please refer to FIG. 1-2 , the present invention is a three-phase motor insulation resistance detection device comprising a detection platform 1, a fixing frame 2, a detection device body 3 and a display screen 4, wherein the fixing frame 2 is fixedly mounted on the detection platform 1, the detection device body 3 is fixedly mounted on the fixing frame 2, and the display screen 4 is fixedly mounted on the fixing frame 2;

The main body of the detection equipment is provided with a detection terminal, a detection data acquisition terminal, a data analysis terminal, a standard resistance value acquisition terminal, a temperature range acquisition terminal, a three-phase deviation compensation coefficient acquisition terminal, and a compensation calculation terminal;

The detection end is used to connect one connection of the detection equipment to the terminal of the motor winding, and the other to the ground wire or the motor housing, and then measure the three phases UVW one by one in turn, and record the insulation resistance value of each phase. When the test equipment tests each motor, the temperature of the test equipment itself is recorded, and the three-phase insulation resistance value of each motor is recorded at the same time;

It should be noted that when obtaining test data when the test equipment tests multiple RF chips at different temperatures, the default power supply voltage, ambient noise, ambient temperature, RF chip specifications and other influencing factors are the same;

The specific method is: connect one connection of the detection equipment to the U phase terminal, and the other to the V phase terminal, and measure the insulation resistance between the UV phases. Similarly, measure the insulation resistance between the UW and VW phases respectively. The insulation resistance between the UV phases: This refers to the insulation resistance between the U phase and the V phase, which is used to check whether there is an insulation problem between the two phases, such as short circuit or leakage, etc. The insulation resistance between the UW phases: This refers to the insulation resistance between the U phase and the W phase, which is also used to evaluate the insulation condition between the two phases. The insulation resistance between the VW phases: This refers to the insulation resistance between the V phase and the W phase, which is used to detect the insulation performance of the two phases.

The detection data acquisition terminal is used to acquire the detection data of the detection device within a preset time T. The detection data includes the temperature of the test device itself and the three-phase insulation resistance value of each motor when the test device is testing, T≥1;

The data analysis end is used to analyze the detection data of the detection device within the preset time T to obtain the detection temperature sequence table, and obtain the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table according to the analysis results of the detection data. The specific method is as follows:

The detection temperature sequence table generating unit is used to obtain the detection temperature sequence table corresponding to the test device according to the device temperature value of the test device within the preset time T and the duration corresponding to the device temperature value, and the specific method is as follows:

Obtain the device temperature value corresponding to the duration greater than the preset value Y1 within the preset time T, and mark it as Aa, a≥1, Y1 is the preset value, and the specific value is formulated by the relevant staff according to the actual needs. Arrange Aa in ascending order according to the value, and then obtain the detection temperature sequence table corresponding to the test equipment;

The resistance detection value acquisition unit analyzes the three-phase insulation resistance values of the test equipment when testing multiple motors at each device temperature value in the detection temperature sequence table, and then obtains the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table, specifically in the following manner:

S1: Randomly select a device temperature value from each device temperature value in the detection temperature sequence table as the target temperature.

S2: Obtain three-phase insulation resistance values when the test equipment tests multiple motors at the analysis temperature, and mark them as BA i, BB i, and BC i, respectively, where i is the number corresponding to the tested motors, i ≥ 1;

The three-phase resistance detection values CA1, CB1 and CC1 corresponding to the test equipment at the analysis temperature are calculated by the formulas (BA _max +BA _min )/2×θ1=CA1, (BB _max +BB _min )/2×θ2=CB1 and (BC _max +BC _min )/2×θ3=CC1, where BA _max , BB _max and BC _max are the maximum values corresponding to BA i, BB i and BC i, respectively, BA _min , BB _min and BC _min are the minimum values corresponding to BAi, BBi and BC i, respectively, θ1, θ2 and θ3 are fixed coefficients, and the specific values are formulated by relevant staff according to actual needs;

S3: Repeat steps S1-S2 to obtain the three-phase resistance detection values CAa, CBa and CCa corresponding to the temperature values of each device, where a is the number of the temperature values of each device in the detection temperature sequence table, and a≥1;

The standard resistance value acquisition end, while controlling other factors of the detection equipment unchanged and at the rated equipment temperature, conducts detection experiments on multiple motors, obtains experimental data of multiple experimental motors, and analyzes the data to obtain the three-phase standard resistance corresponding to the detection equipment. The specific method is as follows:

The three-phase insulation resistance values of multiple experimental motors during the test are marked as DAj, DBj and DCj, and the average values of DAj, DBj and DCj are marked as the three-phase standard resistances EA1, EB1 and EC1 corresponding to the test equipment, where j is the number corresponding to the experimental motor, j≥1;

It should be noted that when testing the experimental motor, it is assumed that the environmental noise, ambient temperature, specifications of the experimental motor and other influencing factors are the same;

The temperature range acquisition terminal is used to obtain multiple temperature ranges corresponding to the detection device according to the device temperature value in the detection temperature sequence table of the detection device. The specific method is as follows:

A temperature interval is generated by measuring the temperature values of each two adjacent devices in the temperature sequence, and then r temperature intervals corresponding to the detection device are obtained, where r = a-1;

The three-phase deviation compensation coefficient acquisition terminal is used to analyze the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table of the detection device and the three-phase standard resistance corresponding to the detection device, and then obtain the three-phase deviation compensation coefficients corresponding to each temperature range of the detection device. The specific method is as follows:

S01: Mark the differences between the three-phase resistance detection values and the three-phase standard resistances corresponding to the temperature values of each device as the three-phase difference resistances FAa, FBa and FCa corresponding to the temperature values of each device;

S02: Use the temperature value of each device as the horizontal coordinate and the corresponding three-phase difference resistance FAa, FBa and FCa as the vertical coordinate to draw the temperature change curve corresponding to the detection device;

S03: According to the device temperature values corresponding to the two end points of each temperature interval and the three-phase difference resistance corresponding to each device temperature value, the slope between the two end points of each temperature interval is obtained by the slope formula, and it is used as the three-phase deviation compensation coefficients XAr, XBr and XCr corresponding to each temperature interval;

For example, one temperature interval is selected as the analysis interval, the device temperatures corresponding to the two endpoints of the analysis interval are marked as WD1 and WD2, and the three-phase differential resistances corresponding to WD1 and WD2 are marked as P1, P2, P3 and G1, G2, G3;

The three-phase deviation compensation coefficients K1, K2 and K3 corresponding to the analysis interval are calculated by the formulas K1 = (P1-G1)/(WD1-WD2), K2 = (P2-G2)/(WD1-WD2) and K3 = (P3-G3)/(WD1-WD2), respectively. The three-phase deviation compensation coefficients XAr, XBr and XCr corresponding to each temperature interval can be obtained in the same way.

The compensation calculation end obtains the real-time three-phase insulation resistance value and the real-time temperature of the detection equipment when the detection equipment detects the motor. The three-phase deviation compensation coefficient corresponding to the temperature range corresponding to the real-time temperature is obtained through the corresponding real-time temperature when the detection equipment detects the motor, and the three-phase deviation compensation coefficient is analyzed to obtain the calculated three-phase insulation resistance value after error compensation when the motor is tested. The specific method is as follows:

When testing the motor, first obtain the real-time temperature SW corresponding to the testing equipment, then obtain the real-time three-phase insulation resistance value of the motor tested by the testing equipment, and mark them as HA, HB and HC respectively, obtain the three-phase deviation compensation coefficients L1, L2 and L3 corresponding to the temperature range corresponding to the real-time temperature SW, and substitute them into MA=(HA+|SW-ED|×L1)×θ1, MB=(HB+|SW-ED|×L2)×θ2 and MC=(HC+|SW-ED|×L3)×θ3 for calculation, and then obtain the calculated three-phase insulation resistance values MA, MB and MC after error compensation when the motor is tested, where ED is the rated equipment temperature corresponding to the testing equipment, θ1, θ2 and θ3 are all correction coefficients, and the specific values are formulated by relevant staff according to actual needs;

The real-time three-phase insulation resistance value and the real-time temperature of the detection equipment when the detection equipment detects the motor are obtained. The three-phase deviation compensation coefficient corresponding to the temperature range corresponding to the real-time temperature is obtained through the corresponding real-time temperature when the detection equipment detects the motor. The three-phase deviation compensation coefficient is analyzed to obtain the calculated three-phase insulation resistance value after error compensation when the motor is tested. The error of the motor insulation resistance caused by the temperature of the detection equipment itself is eliminated to a certain extent, providing more accurate data support for the detection of the motor insulation resistance to eliminate the error caused by temperature, and improving the accuracy and reliability of the motor detection results.

The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters and thresholds in the formula are set by technicians in this field according to actual conditions.

The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (9)

1. A three-phase motor insulation resistance detection device, characterized in that it comprises a detection device body (3), on which a detection terminal, a detection data acquisition terminal, a data analysis terminal, a standard resistance value acquisition terminal, a temperature range acquisition terminal, a three-phase deviation compensation coefficient acquisition terminal, and a compensation calculation terminal are arranged; The detection end is used to measure the three phases UVW one by one in turn, and record the insulation resistance value of each phase, and at the same time record the temperature of the test equipment itself; The detection data acquisition terminal is used to detect the temperature of the test device itself within the preset time T and the three-phase insulation resistance value T≥1 when the test device tests each motor; At the data analysis end, a detection temperature sequence table and three-phase resistance detection values corresponding to each device temperature value are obtained according to the detection data; The standard resistance value acquisition end analyzes the experimental data of multiple experimental motors to obtain the three-phase standard resistance corresponding to the testing equipment while keeping other factors of the testing equipment unchanged and at the rated equipment temperature; A temperature range acquisition terminal is used to acquire multiple temperature ranges corresponding to the detection device according to the device temperature value in the detection temperature sequence table of the detection device; The three-phase deviation compensation coefficient acquisition terminal is used to obtain the three-phase deviation compensation coefficients corresponding to each temperature range based on the three-phase resistance detection values corresponding to each device temperature value and the three-phase standard resistance corresponding to the detection device; At the compensation calculation end, the calculated three-phase insulation resistance value corresponding to the motor is obtained through the real-time three-phase insulation resistance value and real-time temperature corresponding to the motor. 2. A three-phase motor insulation resistance detection device according to claim 1, characterized in that the specific method of obtaining the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table is: Through the detection temperature sequence table generating unit, the detection temperature sequence table corresponding to the test equipment is obtained according to the device temperature values of the test equipment within the preset time T and the duration corresponding to the device temperature values; then, the three-phase insulation resistance values of the test equipment when testing multiple motors at each device temperature value in the detection temperature sequence table are analyzed through the resistance detection value acquisition unit, so as to obtain the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table. 3. A three-phase motor insulation resistance detection device according to claim 2, characterized in that the specific method of obtaining the detection temperature sequence table corresponding to the test device is: Obtain the device temperature value whose duration corresponding to the device temperature value within the preset time T is greater than the preset value Y1, and mark it as and Aa, arrange Aa in ascending order according to the value, and then obtain the detection temperature sequence table corresponding to the test device, where a is the number of each device temperature value in the detection temperature sequence table, a≥1, and Y1 is the preset value. 4. A three-phase motor insulation resistance detection device according to claim 3, characterized in that the specific method of obtaining the three-phase resistance detection values corresponding to each device temperature value in the detection temperature sequence table is: S1: Randomly select a device temperature value from each device temperature value in the detection temperature sequence table as the target temperature. S2: Obtain the three-phase insulation resistance values of multiple motors tested by the test equipment at the analysis temperature, and mark them as BAi, BBi and BC i, respectively, where i is the number corresponding to the tested motors, i≥1; The three-phase resistance detection values CA1, CB1 and CC1 corresponding to the test equipment at the analysis temperature are calculated by the formulas (BA _max +BA _min )/2×θ1=CA1, (BB _max +BB _min )/2×θ2=CB1 and (BC _max +BC _min )/2×θ3=CC1, where BA _max , BB _max and BC _max are the maximum values corresponding to BA i, BBi and BC i, respectively, BA _min , BB _min and BC _min are the minimum values corresponding to BAi, BBi and BC i, respectively, and θ1, θ2 and θ3 are fixed coefficients; S3: Repeat steps S1-S2 to obtain the three-phase resistance detection values CAa, CBa and CCa corresponding to each device temperature value. 5. A three-phase motor insulation resistance detection device according to claim 4, characterized in that the specific method of obtaining the three-phase standard resistance corresponding to the detection device is: The three-phase insulation resistance values of multiple experimental motors during the detection experiment are marked as DAj, DBj and DCj respectively, and the average values of DAj, DBj and DCj are marked as the three-phase standard resistances EA1, EB1 and EC1 corresponding to the detection equipment respectively, where j is the number corresponding to the experimental motor, j≥1. 6. A three-phase motor insulation resistance detection device according to claim 5, characterized in that the specific method of obtaining multiple temperature intervals corresponding to the detection device is: A temperature interval is generated by measuring each two adjacent device temperature values in the temperature sequence, and then r temperature intervals corresponding to the detection device are obtained, where r=a-1. 7. A three-phase motor insulation resistance detection device according to claim 6, characterized in that the specific method of obtaining the three-phase deviation compensation coefficients corresponding to each temperature interval of the detection device is: S01: Mark the differences between the three-phase resistance detection values and the three-phase standard resistances corresponding to the temperature values of each device as the three-phase difference resistances FAa, FBa and FCa corresponding to the temperature values of each device; S02: Use the temperature value of each device as the horizontal coordinate and the corresponding three-phase difference resistance FAa, FBa and FCa as the vertical coordinate to draw the temperature change curve corresponding to the detection device; S03: According to the device temperature values corresponding to the two end points of each temperature interval and the three-phase difference resistances corresponding to each device temperature value, the slope between the two end points of each temperature interval is obtained by the slope formula, and is used as the three-phase deviation compensation coefficients XAr, XBr and XCr corresponding to each temperature interval. 8. A three-phase motor insulation resistance detection device according to claim 7, characterized in that the specific method of obtaining the calculated three-phase insulation resistance value after error compensation when the motor is tested is: When testing the motor, first obtain the real-time temperature SW corresponding to the testing equipment, then obtain the real-time three-phase insulation resistance value of the motor tested by the testing equipment, and mark them as HA, HB and HC respectively, obtain the three-phase deviation compensation coefficients L1, L2 and L3 corresponding to the temperature range corresponding to the real-time temperature SW, and substitute them into MA=(HA+|SW-ED|×L1)×θ1, MB=(HB+|SW-ED|×L2)×θ2 and MC=(HC+|SW-ED|×L3)×θ3 for calculation, and then obtain the calculated three-phase insulation resistance values MA, MB and MC after error compensation when the motor is tested, where ED is the rated equipment temperature corresponding to the testing equipment, and θ1, θ2 and θ3 are correction coefficients. 9. A three-phase motor insulation resistance detection device according to claim 1, characterized in that the three-phase motor insulation resistance detection device comprises a detection platform (1), a fixing frame (2), a detection device body (3) and a display screen (4), the fixing frame (2) is fixedly mounted on the detection platform (1), the detection device body (3) is fixedly mounted on the fixing frame (2), and the display screen (4) is fixedly mounted on the fixing frame (2).