CN215526017U

CN215526017U - Automatic insulation detection system and detector for high-voltage motor winding

Info

Publication number: CN215526017U
Application number: CN202121901130.4U
Authority: CN
Inventors: 彭江波
Original assignee: Dongguan Qianbo Electronic Technology Co ltd
Current assignee: Dongguan Qianbo Electronic Technology Co ltd
Priority date: 2021-08-14
Filing date: 2021-08-14
Publication date: 2022-01-14
Anticipated expiration: 2031-08-14

Abstract

The utility model discloses an automatic insulation detection system for a high-voltage motor winding, which comprises: the current detection circuit, insulating detection circuit, the control unit and the display element, the current detection circuit is used for detecting the leakage current condition of the system that awaits measuring, insulating detection circuit is used for detecting the insulating condition of the system that awaits measuring, the control unit is connected with current detection circuit and insulating detection circuit electricity respectively in order to realize control and data transmission, the display element is connected with current detection circuit and insulating detection circuit electricity respectively in order to show the data that obtain that detect, insulating detection circuit includes high voltage isolation unit, the unit that detects in advance steps up, resistance detection and display control unit, high voltage isolation unit connects between resistance detection and display control unit and the system that awaits measuring, still include the communication unit, in order to send the data that obtain that detect to the outside. By adopting the detection system, the safety of workers can be effectively improved by high-voltage isolation, the detected data can be transmitted outwards, and the system maintenance frequency is reduced.

Description

Automatic insulation detection system and detector for high-voltage motor winding

Technical Field

The utility model relates to the technical field of high-voltage motor winding detection, in particular to an automatic insulation detection system and a detector for a high-voltage motor winding.

Background

In the field of insulation detection of high-voltage motor windings, there are generally two modes for insulation detection of high-voltage motor windings: manual meter shaking detection and automatic meter detection. Manual detection and reporting processes of the swing table are complicated, and the danger is high; the instrument automatic detection is generally that a single instrument is directly connected with a high-voltage primary loop, a plurality of instruments can be used simultaneously, but when maintenance is needed, the instruments are directly connected with a high-voltage motor winding, so that certain danger exists.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides an automatic insulation detection system and a detector for a high-voltage motor winding. The safety of the automatic detection instrument can be effectively improved.

This high-voltage motor winding automatic insulation detecting system includes:

the current detection circuit is used for detecting the leakage current condition of the system to be measured, the insulation detection circuit is used for detecting the insulation condition of the system to be measured, the control unit is respectively and electrically connected with the current detection circuit and the insulation detection circuit to realize control and data transmission, and the display unit is respectively and electrically connected with the current detection circuit and the insulation detection circuit to display detected data;

the insulation detection circuit comprises a high-voltage isolation unit, a boosting pre-detection unit and a resistance detection and display control unit,

the resistance detection and display control unit is connected with the system to be measured so as to detect the resistance value and the conversion absorption ratio of the system to be measured, control the measurement time of the insulation detection circuit and control the display unit to display all parameters of the insulation detection circuit and the detected data,

the high-voltage isolation unit is connected between the resistance detection and display control unit and the system to be measured so as to isolate the high voltage in the system to be measured,

the boosting pre-detection unit is connected with the high-voltage isolation unit so as to boost the voltage of the insulation detection circuit to 1500-2500V;

the current detection circuit comprises a current detection and display control unit which is connected with the system to be measured through a mutual inductor so as to detect the current value of the system to be measured, control the measurement time of the current detection circuit and control the display unit to display various parameter values and detected data of the current detection circuit;

the control unit comprises a first MCU, and the first MCU is respectively connected with the current detection and display control unit and the resistance detection and display control unit;

the communication unit is connected with the control unit so as to externally send the detected data.

Adopt this detecting system, can carry out high-voltage isolation through high-voltage isolation unit, carry out rough treatment to the input signal, isolated high-voltage signal in the system of awaiting measuring, and make the leading-in equipment's signal within the processing range of resistance detection and display control unit, in order to realize not directly detecting the insulating condition of system to be measured under the condition of high voltage, security when can effectively improve the staff and maintain, and the system can also detect the leakage current condition of system to be measured, through being provided with communication unit, can externally send the data that obtains through communication unit with detecting, reduce the system and maintain the frequency.

In some embodiments, the high voltage isolation unit may include a coupler. Therefore, the effect of high-voltage isolation can be realized through the coupler, so that the output high voltage is reduced.

In some embodiments, the current detection and display control unit may include a second MCU, an ADC port of the second MCU is used for detecting the current and boosting the voltage of the pre-detection unit; the resistance detection and display control unit can comprise a third MCU, an ADC port of the third MCU is used for detecting resistance and converting absorption ratio, the second MCU and the third MCU are both connected with the display unit, and the second MCU and the third MCU are both connected with the first MCU. Therefore, when the detection system is in operation, the three MCUs are mutually connected through the connecting pins to realize the switching of the equipment state, and simultaneously, a clock line/data line pattern time sequence protocol is realized to exchange data information.

In some embodiments, the communication unit may include a 485 communication module. Therefore, the 485 communication module can be used for sending the internal data of the system to the outside in a corresponding modbus instruction reading mode.

In some embodiments, the boost pre-detection unit may be used to boost the local voltage within the system to a voltage of 2500V. Therefore, a standard environment can be provided for the detection of the resistance and the absorption ratio by the boosting pre-detection unit.

According to another aspect of the application, a high-voltage motor winding automatic insulation detector is provided, adopt foretell high-voltage motor winding automatic insulation detection system, including instrument host computer and high-voltage isolation module, the detection element in advance steps up, resistance detection and display control unit, current detection and display control unit, the control unit, display unit and communication unit all set up in the instrument host computer, high-voltage isolation module includes high-voltage isolation unit, be equipped with on the instrument host computer and be used for the first terminal and the second terminal of being connected with the system of awaiting measuring, high-voltage isolation module is connected with first terminal so that high-voltage isolation module sets up between instrument host computer and the system of awaiting measuring, the second terminal passes through the mutual-inductor and is connected with the system of awaiting measuring, it is connected with high-voltage isolation module to step up the detection element in advance.

By adopting the detector, the detection system operates, the high voltage of the system to be measured is isolated through the high voltage isolation module, so that the danger of workers in the process of maintaining the detector is reduced, meanwhile, the leakage current, the resistance and the absorption ratio of a high-voltage motor winding can be detected through the detector, and the detected data can be sent out through the communication unit, so that the maintenance frequency of the detector can be reduced, and the occurrence probability of safety accidents is reduced.

In some embodiments, the meter main body may include a wiring panel, the first terminal and the second terminal are both disposed on the wiring panel, the wiring panel is connected to each unit inside the meter main body, and the wiring panel further includes a power connection terminal for connecting a power supply, a communication connection terminal for sending detected data to the outside, a ground terminal for grounding, and a high-voltage insulation connection terminal for connecting with the step-up pre-detection unit. Therefore, each functional unit in the detector can be connected with external equipment through the wiring panel so as to complete the detection of each parameter of the system to be measured.

In some embodiments, the high voltage isolation module may be externally provided with an insulating material. Therefore, the insulating material is coated outside, so that high voltage can be further isolated, and high voltage leakage is prevented.

In some embodiments, the wiring panel may further include a leakage current warning wiring terminal, an insulation resistance warning wiring terminal, and a manual wiring terminal. Therefore, leakage current flow early warning and alarming, resistance value early warning and alarming of the detector and manual measurement mode for measuring all parameters under the state of stopping measurement can be achieved through the terminals on the wiring panel, and the applicability of the detector is improved.

In some embodiments, the meter main unit may further include a display panel connected to the display unit, and the display panel is provided with at least one resistance display nixie tube group, at least one absorption ratio display nixie tube group, at least one current display nixie tube group, and at least one voltage display nixie tube group. Therefore, the data obtained by detecting the digital tube team can be displayed.

In some embodiments, the display panel may further be provided with an operation key for operating the control unit, the operation key is connected to the control unit, and the operation key includes a power switch key and a parameter setting key group for setting preset parameters in the meter host. Therefore, the control unit can be controlled by operating the keys, and further setting of each rated parameter and control of the detector can be realized.

Drawings

Fig. 1 is a block diagram of the connection of the automatic insulation detection system unit of the high-voltage motor winding according to an embodiment of the utility model;

fig. 2 is a circuit diagram of the connection between the current detection circuit and the control unit and the display unit of the automatic insulation detection system for the high-voltage motor winding according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a connection between a high-voltage isolation unit and a boost pre-detection unit of the automatic insulation detection system for a high-voltage motor winding according to an embodiment of the present invention;

FIG. 4 is a circuit diagram of a resistance detection and display control unit of an automatic insulation detection system for high-voltage motor windings according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an automatic insulation detector for high-voltage motor windings according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a wiring panel and a wiring structure of an automatic insulation detector for a high-voltage motor winding according to an embodiment of the utility model;

FIG. 7 is a schematic structural diagram of a display panel of an automatic insulation detector for high-voltage motor windings according to an embodiment of the present invention;

fig. 8 is a logic block diagram of an operation button control program of the automatic insulation detector for a high-voltage motor winding according to an embodiment of the utility model.

Description of reference numerals: 1. an instrument host; 11. a display panel; 111. a resistance display nixie tube group; 1111. an insulation resistance early warning indicator lamp; 1112. an insulation resistance alarm indicator lamp; 112. the absorption ratio display nixie tube group; 113. a current display nixie tube group; 1131. a motor loop leakage current early warning indicator lamp; 1132. a leakage current alarm indicator lamp of the motor loop; 114. a voltage display nixie tube group; 115. a parameter setting indicator light; 121. a power switch key; 122. a power indicator light; 123. a parameter setting key group; 13. a wiring panel; 14. a high voltage insulation terminal; 15. a first terminal; 16. a second terminal; 2. a high voltage isolation module; 21. a high voltage isolation unit; 3. a system to be measured; 4. a boosting pre-detection unit; 5. a resistance detection and display control unit; 6. a current detection and display control unit; 7. a control unit; 8. a communication unit; 9. a display unit.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

fig. 1 schematically shows a unit connection schematic diagram of an automatic insulation detection system for a high-voltage motor winding according to an embodiment of the present invention, fig. 2 schematically shows a circuit connection situation between a current detection circuit, a control unit and a display unit of the automatic insulation detection system for a high-voltage motor winding according to an embodiment of the present invention, and fig. 3 schematically shows a circuit connection situation between a high-voltage isolation unit and a boosting pre-detection unit of the automatic insulation detection system for a high-voltage motor winding according to an embodiment of the present invention.

Referring to fig. 1, the automatic insulation detection system for high-voltage motor winding includes:

the current detection circuit is used for detecting the leakage current condition of the system to be measured 3, the insulation detection circuit is used for detecting the insulation condition of the system to be measured 3, the control unit 7 is respectively electrically connected with the current detection circuit and the insulation detection circuit to realize control and data transmission, and the display unit 9 is respectively electrically connected with the current detection circuit and the insulation detection circuit to display detected data;

the insulation detection circuit comprises a high-voltage isolation unit 21, a boosting pre-detection unit 4 and a resistance detection and display control unit 5,

the resistance detection and display control unit 5 is connected with the system to be measured 3 to detect the resistance value and the converted absorption ratio of the system to be measured 3, control the measurement time of the insulation detection circuit and control the display unit 9 to display each parameter of the insulation detection circuit and the detected data,

the high voltage isolation unit 21 is connected between the resistance detection and display control unit 5 and the system 3 to be measured, so as to isolate the high voltage electricity in the system 3 to be measured,

the boosting pre-detection unit 4 is connected with the high-voltage isolation unit 21 so as to boost the voltage of the insulation detection circuit to 1500-2500V;

the current detection circuit comprises a current detection and display control unit 6, a current detection and display control unit 6 and a voltage detection and display unit 9, wherein the current detection and display control unit 6 is connected with the system 3 to be measured through a zero sequence transformer so as to detect the current value of the system 3 to be measured and the voltage value of the boosting pre-detection unit 4, control the measurement time of the current detection circuit and control the display unit 9 to display various parameter values and detected data of the current detection circuit;

the control unit 7 comprises a first MCU which is respectively connected with the current detection and display control unit 6 and the resistance detection and display control unit 5;

the device also comprises a communication unit 8, wherein the communication unit 8 is connected with the control unit 7 so as to externally send the detected data.

Specifically, the core components of the overall system are mainly the control unit 7, the resistance detection and display control unit 5, and the current detection and display control unit 6. The control unit 7 is used for controlling the operation of each functional unit in the detection system to realize the measurement of each parameter of the system to be measured 3. The control unit 7 mainly comprises a first MCU, and is electrically connected with the resistance detection and display control unit 5 and the current detection and display control unit 6, so that the two units are controlled to work, the leakage current, the resistance and the absorption ratio of the system to be measured 3 are detected, and the data obtained after detection can be transmitted back to the first MCU through the connection feedback with the control unit 7. In the present embodiment, the detected data refers to all values that can be detected by the entire detection unit, including the current value, the resistance value, the absorption ratio, and the voltage value of the boosting pre-detection unit 4.

Referring to fig. 2, the current detection and display control unit 6 is a main component of the current detection circuit, and one end of the current detection and display control unit is connected to the system 3 to be measured, and the other end of the current detection and display control unit is connected to the control unit 7, and the current detection and display control unit is also connected to the display unit 9 in the detection system, and is mainly used for detecting the leakage current of the system 3 to be measured. Specifically, the current detection and display control unit 6 is not directly connected to the system 3 to be measured, but connected to a wound cable, and measures the current in the system 3 to be measured by using mutual inductance, and specifically may be connected to the system 3 to be measured through a zero sequence transformer. The current detection and display control unit 6 comprises a second MCU, an external circuit, a resistance bridge circuit, a range switching relay and the like, wherein the external circuit, the resistance bridge circuit, the range switching relay and the like are connected with the second MCU, the lower end of the second MCU is connected with the control unit 7 through a lead, and the left end of the second MCU is connected with the display unit 9 through a lead. The current detection and display control unit 6 detects current through an ADC port on the second MCU and peripheral circuits thereof, the ADC port of the second MCU can also be connected with the boosting pre-detection unit 4 to detect the voltage of the boosting pre-detection unit 4, and the detected numerical value is displayed on the display unit 9 through the second MCU for the recording of workers in the field. The current detection and display control unit 6 is provided with a second MCU independently, can calculate and process detected data independently, and can control the measurement parameter standards of current detection such as measurement time, early warning parameter values and alarm parameter values through the second MCU simultaneously, thereby improving the data precision obtained by measurement.

Referring to fig. 4, the resistance detection and display control unit 5 is a main component of the insulation detection circuit, one end of which is connected to the system 3 to be measured, and the other end of which is connected to the control unit 7, and at the same time, the resistance detection and display control unit is connected to the display unit 9 in the detection system, and is mainly used for detecting the insulation condition of the system 3 to be measured. Specifically, the resistance detection and display control unit 5 may include a third MCU and an external circuit, a resistance bridge circuit, a range switching relay, etc. connected to the third MCU, the upper end of the third MCU is connected to the control unit 7 through a lead, the right end of the third MCU is connected to the display unit 9 through a lead, and the R at the left end of the third MCU_xThe resistor is connected with a circuit boosted by the boosting pre-detection side unit 4, the resistor detection and display control unit 5 receives a resistor detection signal of the system 3 to be measured through the third MCU, detects the resistor and converts the absorption ratio through an ADC port on the third MCU and a peripheral circuit thereof, and a detected numerical value is displayed on the display unit 9 through the third MCU. Because the resistance detection and display control unit 5 is not directly connected to the system 3 to be measured, but is connected to the circuit isolated by the high voltage isolation unit 21, and the external circuit of the third MCU is also connected to the boost pre-detection side unit 4 to boost the voltage of the circuit, the resistance detection signal is isolated by the high voltage isolation unit 21 and is in an intermittent or continuous boosted voltage environment. The resistance detection and display control unit 5 can independently calculate the detected dataMeanwhile, the third MCU can be used for controlling the measurement parameters such as the measurement time, the early warning parameter value and the warning parameter value, and the data precision obtained by measurement is further improved.

The high-voltage isolation unit 21 is mainly used for isolating high-voltage electricity in the system to be measured 3 in the insulation detection circuit, so that parts of the insulation detection circuit are not directly connected with the system to be measured 3 with 10kV high-voltage electricity, and the risk of workers in maintaining the system is reduced. Specifically, referring to fig. 3, the high voltage isolation unit 21 may be a coupler, the coupler specifically includes a resistor and a relay, the right end of the high voltage isolation unit 21 is connected to the system 3 to be measured through a lead, the left end of the high voltage isolation unit 21 is connected to the boost pre-detection side unit 4 through a lead, the lower end of the high voltage isolation unit 21 is connected to a pin of a third MCU of the resistance detection and display unit 5 through a resistance driving circuit, and the input signal is roughly processed through the high voltage isolation unit 21 to isolate the high voltage signal in the system 3 to be measured, and the signal led into the device is within the processing range of the resistance detection and display control unit 5.

The boosting pre-detection unit 4 has the main function of boosting the voltage of a local circuit loop in the system to 1500-2500V in the insulation detection circuit, so that the environmental standard of resistance and absorption ratio detection of the system to be measured 3 is met. Specifically, referring to fig. 3, the boost pre-detection unit 4 may include a transformer and other components (i.e., an AC/DC boost isolation portion in the figure), the left end of the boost pre-detection unit 4 is connected to 220V AC, the upper end of the boost pre-detection unit 4 is connected to the high-voltage isolation unit 21 through a lead, so as to boost the voltage of the circuit loop of the portion, apply an intermittent or continuous 2500V voltage, provide a standard environment for resistance and absorption ratio detection, and further connect to a pin of a third MCU in the resistance detection and display control unit 5 through a lead at the right end to verify the voltage.

The communication unit 8 is mainly configured to externally transmit result data detected by another unit received by the control unit 7. Specifically, the communication unit 8 may include a 485 communication module, which is composed of an RS-485 chip, where the RS-485 chip is connected to the first MCU, and thus the control unit 7 may transmit external data through the 485 communication module through internal program logic or external control (operation such as key control) logic, and the external 485 communication transmits internal data of the device externally in a manner of corresponding modbus read instruction, where the specific transmission manner may be wired transmission or wireless transmission.

The display unit 9 mainly functions to display the current data, the resistance data, the absorption ratio data, and the voltage value data of the insulation test, which are detected by the current detection and display control unit 6 and the resistance detection and display control unit 5. Specifically, the display unit 9 may include a nixie tube for displaying the detected values, and preferably, the nixie tube is provided with four nixie tube groups corresponding to the four detected values, and each group may be provided with four nixie tubes for displaying the detected data.

In some other embodiments, more groups of digital tube groups can be further provided for displaying preset early warning values and alarm values, and the early warning values and the alarm values can also be provided in the digital tube groups for displaying detected values, and the display is switched by switching. In still other embodiments, the display unit 9 may further include an LED lamp, and the LED lamp may be disposed beside each group of digital pipes for displaying whether the current value exceeds the warning value and the alarm value by being turned on and off.

When using the detecting system of this application, the accessible detects with resistance and shows that the control unit 5 is connected with the system 3 that awaits measuring, again through detecting with current and show that the control unit 6 is connected with the system 3 that awaits measuring, connects high voltage isolation unit 21 between resistance detection and show the control unit 5 and the system 3 that awaits measuring, forms high voltage and keeps apart, avoids instrument and 10 kV's high voltage to directly link. And then, the control unit 7 is only needed to control the resistance detection and display control unit 5 and the current detection and display control unit 6 to detect the leakage current and the insulation condition of the system to be measured 3.

If the device is in the state of measuring the insulation resistance, the boosting pre-detection unit 4 is started to influence a signal to be measured, meanwhile, the resistance detection and display control unit 5 uses an ADC (analog to digital converter) port on the third MCU to realize the acquisition of detection data, and uses a parallel port to connect a nixie tube and an LED lamp to output display information;

if the equipment is in a state of measuring leakage current, the boosting pre-detection unit 4 is not started, signals to be measured are measured, the current detection and display control unit 6 collects detection data by using an ADC (analog to digital converter) port on the second MCU, and a parallel port is used for connecting a nixie tube and an LED lamp to output display information;

after the detection is completed, the control unit 7 controls the communication unit 8 to externally transmit the detected data.

By adopting the detection system, high-voltage isolation can be carried out through the high-voltage isolation unit 21, the safety of workers in maintenance is effectively improved, the communication unit 8 is arranged, detected data can be sent outwards through the communication unit 8, and the system maintenance frequency is reduced.

Example two:

fig. 5 to 8 schematically show the structure of the automatic insulation detector for high-voltage motor windings according to an embodiment of the present application and a schematic diagram of the wiring structure thereof.

Referring to fig. 5, according to another aspect of the present invention, there is provided an automatic insulation detector for high voltage motor winding, which employs the automatic insulation detection system for high voltage motor winding in the first embodiment, including a meter main body 1 and a high voltage isolation module 2, a voltage boosting pre-detection unit 4, a resistance detection and display control unit 5, a current detection and display control unit 6, the control unit 7, the display unit 9 and the communication unit 8 are all arranged in the instrument host 1, the high-voltage isolation module 2 comprises a high-voltage isolation unit 21, a first terminal 15 and a second terminal 16 which are used for being connected with the system 3 to be measured are arranged on the instrument host 1, the high-voltage isolation module 2 is connected with the first terminal 15 to be arranged between the instrument host 1 and the system 3 to be measured, the second terminal 16 is connected with the system 3 to be measured through a zero sequence transformer, and the boosting pre-detection unit 4 is connected with the high-voltage isolation module 2.

Specifically, the meter main body 1 may include a display panel 11 and a wiring panel 13, the display panel 11 is mainly used for displaying a data value obtained by detection required to be displayed in the display unit 9, the wiring panel 13 is mainly used for externally connecting other devices and connecting with the system 3 to be measured, and the wiring panel 13 is connected with each unit inside the meter main body 1 to play a role as a connection medium.

Referring to fig. 6, the connection panel 13 is provided with a plurality of connection terminals, including a first terminal 15 and a second terminal 16, when the meter main unit 1 is in use, the first terminal 15 and the second terminal 16 are both connected to the system to be measured 3, the first terminal 15, i.e.,

connection terminals

7 and 8 in fig. 6, is used to connect the system to be measured 3 to the resistance detection and display control unit 5, the high voltage isolation module 2 is connected between the system to be measured 3 and the first terminal 15, and the second terminal 16, i.e.,

connection terminals

3 and 4 in fig. 6, is used to connect the system to be measured 3 to the current detection and display control unit 6, thereby forming the automatic insulation detection system for high voltage motor winding in the first embodiment.

The high voltage isolation module 2 mainly comprises a coupler, and meanwhile in some embodiments, the high voltage isolation module 2 can be further coated with an insulating material, and the insulating material can be insulating glue, so that high voltage can be further isolated, and high voltage leakage is prevented. Four groups of wiring terminals can be arranged on the high-voltage isolation module 2, wherein the wiring terminals comprise HC1 wiring terminals and HC2 wiring terminals which are used for being connected with a resistance detection and display control unit 5 in the instrument host 1 and are control ends of a coupler high-voltage relay; an AK1 connection terminal for connecting with the boosting pre-detection unit 4; the PE wiring terminal is used for grounding; the HV wiring terminal is used for being connected with the system 3 to be measured, and any phase of an electrode loop of the system 3 to be measured can be connected when the high-voltage isolation module 2 is connected with the system 3 to be measured. The second terminal 16 is connected to the system 3 to be measured through a zero sequence transformer, specifically, the second terminal 16 is connected to the secondary side of the zero sequence transformer, and the primary measurement of the zero sequence transformer is connected to the system 3 to be measured.

The wiring panel 13 may also include power terminals, communication terminals, ground terminals, and high voltage insulation terminals 14. The power supply terminals, namely 13 and 14 terminals in fig. 6, are used for connecting with a power supply port on the control unit 7, and are connected with the AC220V to supply power to the meter main unit 1; the communication connection terminals, namely the

connection terminals

1 and 2 in fig. 6, are used for connecting with the display unit 9 inside the meter host 1, and sending the data detected by the meter host 1 to the outside in a connection manner; a ground terminal, i.e., a 10-terminal in fig. 6, for grounding the meter main body 1; high-voltage insulation binding post 14, the binding post in the middle part in fig. 6, is high-voltage insulation binding post, and it sets up on terminal panel 13 with cylinder shape and protrusion, can distinguish this binding post and other binding post more easily from this, avoids appearing connecing the wrong condition, and this binding post is used for being connected with step-up pre-detection unit 4, therefore can link to each other high-voltage isolation module 2 with step-up pre-detection unit 4 through wire and high-voltage insulation binding post 14.

In some embodiments, the connection panel 13 may further include a leakage current warning connection terminal, an insulation resistance warning connection terminal, and a manual connection terminal. The leakage current early warning wiring terminals, namely 19 and 20 wiring terminals in fig. 6, are used for outputting an early warning signal to equipment connected with the wiring terminals when the detected current is greater than a set value; the leakage current alarm terminal, namely,

terminals

19 and 21 in fig. 6, is used for outputting an alarm signal to equipment connected with the terminal when the detected current is greater than a set value; the insulation resistance early warning wiring terminals, namely the

wiring terminals

22 and 23 in fig. 6, are used for outputting an early warning signal to equipment connected with the wiring terminals when the detected resistance is smaller than a set value; the insulation resistance alarm connection terminals, namely the

connection terminals

22 and 24 in the figure 6 are used for outputting alarm signals to equipment connected with the connection terminals when the detected resistance is smaller than a set value; the manual terminals, i.e., 5 and 6 terminals in fig. 6, are used for measuring the respective data of the system under measurement 3 in a state where the measurement is stopped. The equipment can enter a standby state for stopping measurement after the automatic measurement is finished, and in the state, if special conditions are met, the current real-time measurement data need to be known, and the manual wiring terminals, namely two terminal loops of the 5 and 6 wiring terminals can be closed, so that the equipment immediately enters a measurement state to measure the real-time data.

Referring to fig. 7, the display panel 11 of the meter host 1 is mainly configured to display a detected data value that needs to be displayed in the display unit 9, the display panel 11 includes at least one resistance display digital tube group 111, at least one absorption ratio display digital tube group 112, at least one current display digital tube group 113, and at least one voltage display digital tube group 114, each digital tube group may include four digital tubes, the resistance display digital tube group 111 is configured to display a current insulation resistance value detected by the meter, the absorption ratio display digital tube group 112 is configured to display an absorption ratio value obtained by conversion of the meter, the current display digital tube group 113 is configured to display a current motor circuit leakage current value detected, and the voltage display digital tube group 114 is configured to display an insulation test voltage value generated by the boost pre-detection unit 4.

In some embodiments, the display panel 11 may further additionally provide a digital tube set for displaying an insulation resistance early warning value, an insulation resistance alarm value, a leakage current early warning value, and a leakage current alarm value for the insulation resistance value and the leakage current value, respectively, so as to compare the current insulation resistance value and the current leakage current value returned by the motor with the corresponding early warning value and alarm value, and monitor the state of the system 3 to be measured.

In other embodiments, the display panel 11 may display the current insulation resistance value and the current leakage current value of the motor, which exceed the corresponding warning value and alarm value, in a form of setting an LED lamp. Specifically, a motor loop leakage current early warning indicator light 1131 for displaying whether the current motor loop leakage current value exceeds an early warning value or not and a motor loop leakage current alarm indicator light 1132 for displaying whether the current motor loop leakage current value exceeds an alarm value or not may be arranged beside the current display nixie tube group 113, the motor loop leakage current early warning indicator light 1131 may be set to yellow to represent a primary alarm, and the motor loop leakage current alarm indicator light 1132 may be set to yellow to represent a secondary alarm; correspondingly, an insulation resistance early warning indicator 1111 and an insulation resistance alarm indicator 1112 can be arranged beside the resistance display nixie tube group 111, the insulation resistance early warning indicator 1111 can be set to be yellow to represent primary warning, and the insulation resistance alarm indicator 1112 can be set to be red to represent secondary warning.

The display panel 11 may further be provided with operation keys for operating the control unit 7, and the operation keys include a power switch key 121. A power indicator lamp 122 for indicating whether the meter main body 1 is in an energized state may be provided corresponding to the power switch key 121.

In some embodiments, the operation keys may further include a parameter setting key group 123, the parameter setting key group 123 may include an increase key, a decrease key, a set key, a left shift key, a right shift key, and an enter key, the setting of each preset parameter may be entered through a pressing interaction of each key by using a logic program preset by the first MCU, and the display panel 11 may further have a parameter setting indicator light 115 to display whether the instrument device enters a setting state.

Fig. 8 schematically shows a logic block diagram of an operation key control program of the automatic insulation detector for the high-voltage motor winding.

Specifically, referring to fig. 8, taking an example of a meter provided with only one resistance display nixie tube group 111, one absorption ratio display nixie tube group 112, one current display nixie tube group 113, and one voltage display nixie tube group 114, a certain preset logic program is as follows:

when the equipment is in a power-on state, simultaneously pressing a set key and a reduction key to enter a set state;

after entering a setting state, the setting state is in a prepared setting interface, at the moment, the parameter setting indicator lamp 115 flickers to indicate that the instrument enters the setting state, and at the moment, each digital tube group is used for displaying a resistance early warning value, a resistance alarm value, an equipment ID, measurement time, measurement stopping time, a current early warning value and a preset value of the current alarm value;

the equipment is in a setting state, a setting key is pressed for multiple times, the equipment state can be circularly switched under a resistance related value setting state, an equipment ID and start-stop time setting state, a current related value setting state and a prepared setting interface state in sequence, so that the information of each preset value can be displayed on each digital tube group, and each parameter value of the equipment can be modified and set by using an increase key, a decrease key, a left shift key and a right shift key;

after each parameter value of the equipment is modified and set, an enter key is pressed for about one second, and then an early warning indicator lamp and an alarm indicator lamp above a nixie tube group for displaying the parameter value are both lighted up to show that the storage of the currently modified data is finished;

and after the relevant numerical values are modified, switching the equipment state to the equipment interface state by pressing the setting key, and exiting the setting state by simultaneously pressing the setting key and the enter key.

The preset value of the resistance early warning value can be 20 MOmega, the resistance alarm value can be 10 MOmega, the equipment ID can be 01, the measurement time can be 2 minutes, the measurement stopping time can be 60 minutes, the current early warning value can be 500mA, and the current alarm value can be 1000 mA.

When the detector is used specifically, the first terminal 15 on the instrument host 1 is connected with the HC1 and HC2 wiring terminals of the high-voltage isolation module 2, the HV terminal of the high-voltage isolation module 2 is connected with any one of three phases of the system 3 to be measured, the second terminal 16 of the instrument host 1 is connected with the system 3 to be measured through the zero sequence transformer, the high-voltage insulation wiring terminal 14 of the instrument host 1 is connected with the AK terminal of the high-voltage isolation module 2 to connect the boosting pre-detection unit 4 with the high-voltage isolation unit 21, then the instrument is started, the leakage current and insulation conditions of the system 3 to be measured can be detected according to the preset measurement time and the stop measurement time in the instrument host 1, and the detected data are sent out through the communication unit 8.

By adopting the detector, the detection system in the first embodiment of the application is operated, and the high voltage of the system to be measured 3 is isolated through the high voltage isolation module 2, so that the danger of workers in the maintenance of the detector can be effectively reduced, meanwhile, the leakage current, the resistance and the absorption ratio of a high-voltage motor winding can be detected through the detector, and the detected data can be sent out through the communication unit 8, so that the maintenance frequency of the detector can be reduced, and the occurrence probability of safety accidents is reduced.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the utility model.

Claims

1. High-voltage machine winding automatic insulation detecting system, its characterized in that: comprises that

The current detection circuit is used for detecting the leakage current condition of a system to be measured, the insulation detection circuit is used for detecting the insulation condition of the system to be measured, the control unit is respectively and electrically connected with the current detection circuit and the insulation detection circuit to realize control and data transmission, and the display unit is respectively and electrically connected with the current detection circuit and the insulation detection circuit to display detected data;

the current detection circuit comprises a current detection and display control unit, the current detection and display control unit is connected with the system to be measured through a mutual inductor so as to detect the current value of the system to be measured, control the measurement time of the current detection circuit and control the display unit to display various parameter values and detected data of the current detection circuit;

2. The automatic insulation detection system for high-voltage motor windings according to claim 1, characterized in that: the high voltage isolation unit includes a coupler.

3. The automatic insulation detection system for high-voltage motor windings according to claim 1, characterized in that: the current detection and display control unit comprises a second MCU, and an ADC port of the second MCU is used for detecting current and boosting the voltage of the pre-detection unit; the resistance detection and display control unit comprises a third MCU, an ADC port of the third MCU is used for detecting resistance and converting absorption ratio, the second MCU and the third MCU are both connected with the display unit, and the second MCU and the third MCU are both connected with the first MCU.

4. The automatic insulation detection system for high-voltage motor windings according to claim 1, characterized in that: the communication unit comprises a 485 communication module.

5. The automatic insulation detection system for high-voltage motor windings according to claim 1, characterized in that: the boosting pre-detection unit is used for boosting the voltage of the insulation detection circuit to 2500V.

6. An automatic insulation detector for a high-voltage motor winding, which adopts the automatic insulation detection system for the high-voltage motor winding of any one of the claims 1 to 5, is characterized in that: including instrument host computer and high voltage isolation module, step up in advance the detecting element the resistance detects and shows the control unit current detection and display the control unit the display element and the communication unit all sets up in the instrument host computer, the high voltage isolation module includes the high voltage isolation unit, be equipped with on the instrument host computer be used for with the first terminal and the second terminal of the volume of awaiting measuring headtotail, the high voltage isolation module is connected with first terminal so that the high voltage isolation module sets up between instrument host computer and volume of awaiting measuring system, the second terminal passes through mutual-inductor and volume of awaiting measuring headtotail, step up in advance the detecting element with the high voltage isolation module is connected.

7. The automatic insulation detector for high-voltage motor windings according to claim 6, characterized in that: the instrument host computer includes wiring panel, first terminal with the second terminal all sets up on wiring panel, wiring panel and the inside each unit connection of instrument host computer, wiring panel still including the power binding post who is used for connecting the power, be used for detecting the communication binding post that obtains the data to sending outward, be used for the ground terminal of ground connection and be used for with step up the high voltage insulation binding post who detects the unit connection in advance.

8. The automatic insulation detector for high-voltage motor windings according to claim 6, characterized in that: and an insulating material is arranged outside the high-voltage isolation module.

9. The automatic insulation detector for high-voltage motor windings according to claim 7, characterized in that: the wiring panel is further provided with a leakage current early warning wiring terminal, a leakage current warning wiring terminal, an insulation resistance early warning wiring terminal, an insulation resistance warning wiring terminal and a manual wiring terminal.

10. The automatic insulation detector for high-voltage motor windings according to claim 6, characterized in that: the meter host also comprises a display panel connected with the display unit, and the display panel is provided with at least one resistance display nixie tube group, at least one absorption ratio display nixie tube group, at least one current display nixie tube group and at least one voltage display nixie tube group;

the display panel is further provided with an operation key for controlling the control unit, the operation key is connected with the control unit and comprises a power switch key and a parameter setting key group for setting preset parameters in the instrument host.