CN113589122B - Automatic insulation detection system and detector for high-voltage motor winding - Google Patents
Automatic insulation detection system and detector for high-voltage motor winding Download PDFInfo
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- CN113589122B CN113589122B CN202110933472.2A CN202110933472A CN113589122B CN 113589122 B CN113589122 B CN 113589122B CN 202110933472 A CN202110933472 A CN 202110933472A CN 113589122 B CN113589122 B CN 113589122B
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- 238000001514 detection method Methods 0.000 title claims abstract description 212
- 238000009413 insulation Methods 0.000 title claims abstract description 108
- 238000004804 winding Methods 0.000 title claims abstract description 42
- 238000002955 isolation Methods 0.000 claims abstract description 66
- 238000004891 communication Methods 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 28
- 238000010521 absorption reaction Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 10
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000000306 component Substances 0.000 description 4
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- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- 238000002360 preparation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The invention discloses an automatic insulation detection system for a high-voltage motor winding, which comprises the following components: the system comprises a current detection circuit, an insulation detection circuit, a control unit and a display unit, wherein 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 electrically connected with the current detection circuit and the insulation detection circuit to realize control and data transmission, the display unit 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, a boosting pre-detection unit and a resistance detection and display control unit, and the high-voltage isolation unit is connected between the resistance detection and display control unit and the system to be measured and further comprises a communication unit to externally send the detected data. By adopting the detection system, the safety of staff can be effectively improved through high-voltage isolation, the detected data can be sent outwards, and the system maintenance frequency is reduced.
Description
Technical Field
The invention relates to the technical field of high-voltage motor winding detection, in particular to an automatic insulation detection system and an automatic insulation detection instrument for a high-voltage motor winding.
Background
In the field of high-voltage motor winding insulation detection, there are two general ways to detect the insulation of a high-voltage motor winding: and the manual detection of the hand crank and the automatic detection of the instrument. The manual detection and reporting process of the cradle is complicated and has high risk; the instrument automatic detection is generally that a single instrument is directly connected with a high-voltage primary loop, and a plurality of instruments can be used simultaneously, but when maintenance is needed, the instrument is directly connected with a high-voltage motor winding, so that a certain danger exists.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an automatic insulation detection system and a detector for a high-voltage motor winding. The safety of adopting instrument automated inspection in time can effectively be improved.
This automatic insulation detecting system of high voltage motor winding includes:
the system comprises a current detection circuit, an insulation detection circuit, a control unit and a display unit, wherein 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 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 to detect the resistance value and the converted absorption ratio of the system to be measured, control the measurement time of the insulation detection circuit and control the display unit to display the 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 to isolate high-voltage electricity in the system to be measured,
the boosting pre-detection unit is connected with the high-voltage isolation unit to boost the voltage of the insulation detection circuit;
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 the parameter values of the current detection circuit and the detected data;
the control unit comprises a first MCU which 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 to send the detected data to the outside.
By adopting the detection system, the high-voltage isolation unit is used for carrying out high-voltage isolation on the input signal, so that the high-voltage signal in the system to be measured is isolated, the signal of the leading-in equipment is in the processing range of the resistance detection and display control unit, the insulation condition of the system to be measured is detected under the condition that the high voltage is not directly connected, the safety of staff maintenance can be effectively improved, the leakage current condition of the system to be measured can be detected, the communication unit is arranged, the detected data can be externally transmitted through the communication unit, and the system maintenance frequency is reduced.
In some embodiments, the high voltage isolation unit may include a coupler. Thus, the effect of high voltage isolation can be achieved by the coupler to cut down the output high voltage.
In some embodiments, the current detection and display control unit may include a second MCU having an ADC port for detecting a current and boosting a 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 connected with the display unit, and the second MCU and the third MCU are connected with the first MCU. Therefore, the detection system can realize the switching of the equipment states by utilizing the three MCUs through the connecting pins in operation, and realize the clock line/data line pattern time sequence protocol to exchange data information.
In some embodiments, the communication unit may include a 485 communication module. Therefore, internal data of the system can be externally transmitted by adopting a mode of reading instructions in a corresponding modbus through the 485 communication module.
In some embodiments, the boost pre-detection unit may be used to boost the local voltage within the system to 2500V. Thus, standard environment can be provided for detection of resistance and absorption ratio by the boost pre-detection unit.
According to another aspect of the application, the automatic insulation detector for the high-voltage motor winding comprises an instrument host and a high-voltage isolation module, wherein the boosting pre-detection unit, the resistance detection and display control unit, the current detection and display control unit, the display unit and the communication unit are all arranged in the instrument host, the high-voltage isolation module comprises a high-voltage isolation unit, a first terminal and a second terminal which are used for being connected with a system to be measured are arranged on the instrument host, the high-voltage isolation module is connected with the first terminal so that the high-voltage isolation module is arranged between the instrument host and the system to be measured, the second terminal is connected with the system to be measured through a transformer, and the boosting pre-detection unit is connected with the high-voltage isolation module.
By adopting the detector, the detection system is operated, and the high voltage of the system to be measured is isolated through the high voltage isolation module, so that the danger of a worker when the detector is maintained is reduced, meanwhile, the leakage current, the resistance and the absorption ratio of the 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 host may include a wiring panel, the first terminal and the second terminal being both disposed on the wiring panel, the wiring panel being connected with each unit inside the meter host, the wiring panel further including a power supply wiring terminal for connecting a power supply, a communication wiring terminal for transmitting the detected data to the outside, a ground terminal for grounding, and a high-voltage insulation wiring terminal for connecting with the boosting pre-detection unit. Therefore, each functional unit in the detector can be connected with external equipment through the wiring panel so as to finish detection of each parameter of the system to be measured.
In some embodiments, the high voltage isolation module may be provided externally with an insulating material. Therefore, the insulating material is coated outside, so that high voltage can be further isolated, and high voltage leakage can be prevented.
In some embodiments, the wiring panel can further comprise 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. Therefore, the leakage current flow early warning and alarming, the resistance value early warning and alarming of the detector and the measurement of each parameter in a manual measurement mode under the measurement stop state can be realized through the terminals on the wiring panel, and the applicability of the detector is improved.
In some embodiments, the instrument host may further include a display panel connected to the display unit, where the display panel is provided with at least one resistance display digital tube set, at least one absorption ratio display digital tube set, at least one current display digital tube set, and at least one voltage display digital tube set. Thus, the data detected by the digital tube group can be displayed.
In some embodiments, an operation key for controlling the control unit may be further disposed on the display panel, where 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 a preset parameter in the instrument host. Therefore, the control unit can be controlled through the operation keys, and setting of all rated parameters and control of the detector to work are further achieved.
Drawings
FIG. 1 is a block diagram of a connection of a unit of an automatic insulation detection system for a high-voltage motor winding according to an embodiment of the present invention;
FIG. 2 is a circuit diagram showing the connection of the current detecting circuit of the automatic insulation detecting system for high-voltage motor winding, the control unit and the display unit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of the connection of the high voltage isolation unit and the boost pre-detection unit of the automatic insulation detection system for high voltage motor windings 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 a high-voltage motor winding according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an automatic insulation detector for a high-voltage motor winding according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a wiring panel and wiring structure of an automatic insulation detector for high-voltage motor windings according to an embodiment of the present invention;
FIG. 7 is a schematic view of a display panel of an automatic insulation detector for a high-voltage motor winding according to an embodiment of the present invention;
fig. 8 is a block diagram showing a control program of an operation button of the automatic insulation detector for a high-voltage motor winding according to an embodiment of the present invention.
Reference numerals illustrate: 1. an instrument host; 11. a display panel; 111. resistance display digital tube group; 1111. insulation resistance early warning indicator lamp; 1112. insulation resistance alarm indicator lamp; 112. the absorption ratio displays the digital tube group; 113. a current display digital tube group; 1131. leakage current early warning indicator lamp of motor loop; 1132. leakage current alarm indicator lamp of motor loop; 114. a voltage display digital tube group; 115. parameter setting indicator lamps; 121. a power switch key; 122. a power indicator light; 123. a parameter setting key set; 13. a wiring panel; 14. high voltage insulation wiring 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. and a display unit.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Embodiment one:
fig. 1 schematically illustrates a schematic unit connection diagram of an automatic insulation detection system for a high-voltage motor winding according to an embodiment of the present application, fig. 2 schematically illustrates a circuit connection situation between a current detection circuit and 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 application, and fig. 3 schematically illustrates a circuit connection situation between a high-voltage isolation unit and a pre-boost detection unit of the automatic insulation detection system for a high-voltage motor winding according to an embodiment of the present application.
Referring to fig. 1, the high voltage motor winding automatic insulation detection system comprises:
the system comprises a current detection circuit, an insulation detection circuit, a control unit 7 and a display unit 9, wherein 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 and 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 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 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 to be measured 3, to isolate the high voltage electricity in the system to be measured 3,
the boosting pre-detection unit 4 is connected with the high-voltage isolation unit 21 to boost the voltage of the insulation detection circuit;
the current detection circuit comprises a current detection and display control unit 6, the current detection and display control unit 6 is connected with the system to be measured 3 through a zero sequence transformer so as to detect the current value of the system to be measured 3 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 the parameter values of the current detection circuit and the detected data;
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 to externally send the detected data.
Specifically, the core components of the overall system are mainly a control unit 7, a resistance detection and display control unit 5, and a current detection and display control unit 6. The control unit 7 functions to operatively control the operation of the functional units in the detection system to achieve the measurement of the parameters of the system 3 to be measured. 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, leakage current, resistance and absorption ratio of the system 3 to be measured are detected, and data obtained after detection can be transmitted back to the first MCU through connection feedback with the control unit 7. In the present embodiment, the detected data refers to all values that can be detected by the overall detection unit, including a current value, a resistance value, an absorption ratio, and a voltage value of the boosting pre-detection unit 4.
Referring to fig. 2, the current detecting and displaying control unit 6 is a main component of a current detecting 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, is connected to the display unit 9 in the detecting system, which 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 to be measured 3, but connected to a winding cable, and uses mutual inductance to measure the current in the system to be measured 3, and specifically can be connected to the system to be measured 3 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 which are connected with the second MCU, wherein the lower end of the second MCU is connected with the control unit 7 through a lead wire, and the left end of the second MCU is connected with the display unit 9 through a lead wire. The current detection and display control unit 6 detects the current through an ADC port on the second MCU and its peripheral circuit, and may also connect the ADC port of the second MCU with the pre-boost detection unit 4 to detect the voltage of the pre-boost detection unit 4, and the detected value is displayed on the display unit 9 through the second MCU for the present staff to record. The current detection and display control unit 6 can independently calculate and process detected data through independently arranging a second MCU, and meanwhile, measurement parameter standards such as measurement time, early warning parameter values, alarm parameter values and the like of current detection can be controlled through the second MCU, so that data accuracy obtained through measurement is improved.
Referring to fig. 4, the resistance detection and display control unit 5 is a main component of an insulation detection circuit, one end of which is connected to the system to be measured 3, and the other end of which is connected to the control unit 7, and at the same time, the unit is also connected to the display unit 9 in the detection system, which is mainly used for detecting the insulation condition of the system to be measured 3. 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, wherein the upper end of the third MCU is connected to the control unit 7 through a lead wire, and the right end of the third MCU is connected to the display unit 9 through a lead wireR at the left end of the third MCU x The resistor is connected with the circuit which is 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 the converted absorption ratio through an ADC port on the third MCU and a peripheral circuit thereof, and the detected numerical value is displayed on the display unit 9 through the third MCU. The resistance detection and display control unit 5 is not directly connected with the system 3 to be measured, but is connected with a circuit isolated by the high-voltage isolation unit 21, and meanwhile, an external circuit of the third MCU is also connected with the boosting pre-detection side unit 4 to boost the voltage of the circuit, so that the resistance detection signal is isolated by the high-voltage isolation unit 21 and is in a discontinuous or continuous 2500V voltage environment. The resistance detection and display control unit 5 can independently calculate and process detected data, and meanwhile, can control measurement parameters such as measurement time, early warning parameter values, alarm parameter values and the like through the third MCU, so that the data accuracy obtained by measurement is improved.
The high-voltage isolation unit 21 has the main function of isolating high-voltage electricity in the system to be measured 3 in the insulation detection circuit, so that components 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 the process of maintaining the system is reduced. Specifically, referring to fig. 3, the high voltage isolation unit 21 may be a coupler, and the coupler specifically includes a resistor and a relay, where 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 pre-boost detection unit 4 through a lead, the lower end of the high voltage isolation unit 21 is connected to a pin of the third MCU of the resistor detection and display unit 5 through a resistor driving circuit, and coarse processing is performed on an input signal through the high voltage isolation unit 21, so as to isolate the high voltage signal in the system 3 to be measured, and make a signal of an introduced device within a processing range of the resistor detection and display control unit 5.
The boosting pre-detection unit 4 has the function of mainly boosting the voltage of a local circuit loop in the system in the insulation detection circuit, so that the environmental standard of resistance and absorption ratio detection of the system 3 to be measured is met. Specifically, referring to fig. 3, the boosting pre-detection unit 4 may include a transformer and other components (i.e., an AC/DC boosting isolation part in the drawing), the left end of the boosting pre-detection unit 4 is connected to 220V AC power, the upper end of the boosting pre-detection unit 4 is connected to the high voltage isolation unit 21 through a lead wire, and further voltage boosting is performed on the circuit loop of the part, a discontinuous or continuous 2500V voltage is applied, a standard environment is provided for resistance and absorption ratio detection, and the lead wire at the right end is connected to a pin of a third MCU in the resistance detection and display control unit 5 to verify the voltage.
The communication unit 8 mainly serves to send out the result data detected by other units 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, so that the control unit 7 may send external data to the external device by using internal program logic or external control (such as key control) logic through the 485 communication module, and the external 485 communication may send internal data of the external device by using a mode of a read instruction in a corresponding modbus, and a specific sending mode may be wire transmission or wireless transmission.
The display unit 9 mainly functions to detect the current data, the resistance data, the absorption ratio data, and the voltage value data of the insulation test obtained 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 groups of nixie tube 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, the number of the digital tube sets may be further set to display a preset early warning value and an alarm value, or the early warning value and the alarm value may be set in the digital tube set for displaying the detected value, and the display may be switched by a switching manner. In still other embodiments, the display unit 9 may further include an LED lamp, which may be disposed beside each of the digital tube sets, for displaying whether the current value exceeds the pre-warning value and the alarm value by being turned on and off.
When the detection system of the application is used, the resistance detection and display control unit 5 is connected with the system 3 to be measured, the current detection and display control unit 6 is connected with the system 3 to be measured, the high-voltage isolation unit 21 is connected between the resistance detection and display control unit 5 and the system 3 to be measured, high-voltage isolation is formed, and the instrument is prevented from being directly connected with high-voltage of 10 kV. Then, the control unit 7 is only used for controlling 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 equipment is in a state of measuring insulation resistance, starting a boosting pre-detection unit 4 to influence a signal to be measured, meanwhile, acquiring detection data by using an ADC port on a third MCU by using a resistance detection and display control unit 5, and outputting display information by using a parallel port to connect a nixie tube and an LED lamp;
if the equipment is in a leakage current measurement state, the boosting pre-detection unit 4 is not started, a signal to be measured is not detected, the current detection and display control unit 6 uses an ADC port on the second MCU to realize detection data acquisition, and uses a parallel port to connect a nixie tube and an LED lamp to output display information;
after the detection, the control unit 7 controls the communication unit 8 to send the detected data to the outside.
By adopting the detection system, the high-voltage isolation can be performed through the high-voltage isolation unit 21, so that the safety of staff in maintenance can be effectively improved, the communication unit 8 is arranged, the detected data can be sent outwards through the communication unit 8, and the system maintenance frequency is reduced.
Embodiment two:
fig. 5 to 8 schematically show the structure of the automatic insulation detector for a high-voltage motor winding 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 windings, which adopts the automatic insulation detection system for high-voltage motor windings in the first embodiment, and includes a meter main body 1 and a high-voltage isolation module 2, wherein a boosting pre-detection unit 4, a resistance detection and display control unit 5, a current detection and display control unit 6, a control unit 7, a display unit 9, and a communication unit 8 are all disposed in the meter main body 1, the high-voltage isolation module 2 includes a high-voltage isolation unit 21, a first terminal 15 and a second terminal 16 for connection with the system 3 to be measured are disposed on the meter main body 1, the high-voltage isolation module 2 is connected with the first terminal 15 to be disposed between the meter main body 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 instrument host 1 may include a display panel 11 and a wiring panel 13, where the display panel 11 is mainly used to display the detected data value that needs to be displayed in the display unit 9, and the wiring panel 13 is mainly used to connect with other devices and connect with the system 3 to be measured, and the wiring panel 13 is connected with each unit inside the instrument host 1, so as to play a role as a connecting medium.
Referring to fig. 6, the wiring panel 13 is provided with a plurality of wiring terminals, including a first terminal 15 and a second terminal 16, where the first terminal 15 and the second terminal 16 are both connected to the system to be measured 3 when the instrument host 1 is in use, the first terminal 15, that is, the 7 and 8 wiring terminals in fig. 6, are 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, that is, the 3 and 4 wiring terminals in fig. 6, are used to connect the system to be measured 3 to the current detection and display control unit 6, so as to form the automatic insulation detection system for high voltage motor windings in the first embodiment.
The high-voltage isolation module 2 mainly comprises a coupler, and 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, and the wiring terminals comprise HC1 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 coupler high-voltage relay control ends; AK1 connection terminals for connection to the boosting pre-detection unit 4; a PE connection terminal for grounding; the HV connecting terminal is used for being connected with the system to be measured 3, and any phase of an electrode loop of the measuring system 3 can be received when the high-voltage isolation module 2 is connected with the system to be measured 3. The second terminal 16 is connected with the system to be measured 3 through a zero sequence transformer, specifically, the second terminal 16 is connected with the secondary side of the zero sequence transformer, and the primary measurement of the zero sequence transformer is connected with the system to be measured 3.
The wiring panel 13 may further include a power supply wiring terminal, a communication wiring terminal, a ground terminal, and a high voltage insulation wiring terminal 14. The power supply connection terminals, namely 13 and 14 connection terminals in fig. 6, are used for being connected with a power port on the control unit 7, are connected with an AC220V and are used for providing power for the instrument host 1; the communication connection terminals, namely the connection terminals 1 and 2 in fig. 6, are used for being connected with the display unit 9 inside the instrument host 1 so as to send out the data detected by the instrument host 1 in a wiring mode; the grounding terminal, namely the 10 wiring terminal in fig. 6, is used for grounding the instrument host 1; the high-voltage insulation terminal 14, i.e., the terminal in the middle of fig. 6, is a high-voltage insulation terminal that is provided in a cylindrical shape and protrudes on the terminal panel 13, whereby it is possible to more easily distinguish the terminal from other terminals, avoiding the occurrence of a misconnection, which is used for connection with the boosting pre-detection unit 4, and thus the high-voltage isolation module 2 can be connected with the boosting pre-detection unit 4 through a wire and the high-voltage insulation terminal 14.
In some embodiments, the wiring panel 13 may further include a leakage current warning wiring terminal, an insulation resistance warning wiring terminal, and a manual wiring terminal. The leakage current early warning wiring terminals, namely 19 and 20 wiring terminals in fig. 6, are used for outputting early warning signals to equipment connected with the wiring terminals when detected current is larger than a set value; a leakage current alarm terminal, namely 19 and 21 in fig. 6, which is used for outputting an alarm signal to equipment connected with the terminal when the detected current is greater than a set value; an insulation resistance early warning wiring terminal, namely 22 wiring terminals and 23 wiring terminals in fig. 6, which are used for outputting an early warning signal to equipment connected with the wiring terminal when the detected resistance is smaller than a set value; an insulation resistance alarm terminal, namely 22 and 24 in fig. 6, which is used for outputting an alarm signal to equipment connected with the terminal when the detected resistance is smaller than a set value; the manual terminals, i.e. 5, 6 terminals in fig. 6, are used for measuring the respective data of the system to be measured 3 in a state in which the measurement is stopped. The device can enter a standby state for stopping measurement after the automatic measurement is finished, and in the standby state, if special conditions are met, the current real-time measurement data is required to be known, and the manual wiring terminals, namely two terminal loops of the 5-6 wiring terminals, can be closed, so that the device immediately enters the measurement state to measure the real-time data.
Referring to fig. 7, the display panel 11 of the instrument host 1 is mainly used for displaying detected data values required to be displayed in the display unit 9, the display panel 11 includes at least one resistor 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 resistor display digital tube group 111 is used for displaying a current insulation resistance value detected by the instrument, the absorption ratio display digital tube group 112 is used for displaying an absorption ratio obtained by instrument detection conversion, the current display digital tube group 113 is used for displaying a current motor loop leakage current value detected by the detection, and the voltage display digital tube group 114 is used for displaying an insulation test voltage value generated by the boosting pre-detection unit 4.
In some embodiments, the display panel 11 may further be additionally provided with a digital tube set for displaying an insulation resistance early warning value, an insulation resistance warning value, a leakage current early warning value and a leakage current warning value for the insulation resistance value and the leakage current value, so that the current insulation resistance value, the current motor return leakage current value and the corresponding early warning value and warning value can be compared, and the state of the system to be measured 3 can be monitored.
In other embodiments, the display panel 11 may display the current insulation resistance value and the current motor return leakage current value in the form of setting an LED lamp, which exceed the corresponding early warning value and alarm value. Specifically, a motor loop leakage current warning indicator 1131 for displaying whether the current motor loop leakage current value exceeds the warning value and a motor loop leakage current warning indicator 1132 for displaying whether the current motor loop leakage current value exceeds the warning value may be disposed beside the current display digital tube group 113, the motor loop leakage current warning indicator 1131 may be set to yellow to represent a primary warning, and the motor loop leakage current warning indicator 1132 may be set to yellow to represent a secondary warning; correspondingly, an insulation resistance early warning indicator 1111 and an insulation resistance warning indicator 1112 may be disposed beside the resistance display digital tube set 111, the insulation resistance early warning indicator 1111 may be set to yellow to represent a primary warning, and the insulation resistance warning indicator 1112 may be set to red to represent a secondary warning.
The display panel 11 may further be provided with operation keys for controlling the control unit 7, and the operation keys include a power switch key 121. Corresponding to the power switch key 121, a power indicator 122 for indicating whether the meter main unit 1 is in an energized state may be provided.
In some embodiments, the operation keys may further include a parameter setting key set 123, where the parameter setting key set 123 may include an increase key, a decrease key, a setting key, a shift left key, a shift right key, and an enter key, and the first MCU may be used to preset a logic program, enter the setting of each preset parameter through the pressing interaction of each key, and there may be a parameter setting indicator 115 on the display panel 11 to display whether the instrument device enters the setting state.
Fig. 8 schematically shows a block diagram of the control program of the operating key of the automatic insulation detector for the high-voltage motor winding.
Specifically, referring to fig. 8, taking an example of an instrument in which only one resistance display tube bank 111, one absorption ratio display tube bank 112, one current display tube bank 113, and one voltage display tube bank 114 are provided, a certain preset logic program is as follows:
pressing a setting key and a reducing key simultaneously when the equipment is in an electrified state, and entering the setting state;
after entering the setting state, the setting state is in a preparation setting interface, and at the moment, the parameter setting indicator lamp 115 flashes to indicate that the instrument enters the setting state, and at the moment, each digital tube group is used for displaying preset values of a resistance early warning value, a resistance alarm value, an equipment ID, a measuring time, a stop measuring time, a current early warning value and a current alarm value;
the device is in a setting state, the setting key is pressed repeatedly, the device state can be circularly switched in the resistance related value setting state, the device ID and start-stop time setting state, the current related value setting state and the preparation setting interface state in sequence, so that information of each preset value can be displayed on each digital tube group, and further, each parameter value of the device can be modified and set by using the increasing key, the decreasing key, the left shift key and the right shift key;
after modifying and setting each parameter value of the equipment, pressing an enter key for about one second, and then lighting an early warning indicator lamp and an alarm indicator lamp above a digital tube group for displaying the parameter value, wherein the early warning indicator lamp and the alarm indicator lamp are both on and indicate that the current modified data storage is completed;
after the modification of each related numerical value is completed, the equipment state is switched to the interface state with the equipment by pressing the setting key, and then the setting state is exited by pressing the setting key and the carriage return key simultaneously.
The preset value of the resistance early warning value can be 20MΩ, the resistance warning value can be 10MΩ, 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 warning value can be 1000mA.
When the detector is specifically used, 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 the 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 so as to connect the boosting pre-detection unit 4 with the high-voltage isolation unit 21, then the instrument is started to detect leakage current and insulation conditions of the system 3 to be measured according to preset measurement time and stop measurement time in the instrument host 1, and the detected data are sent outwards by the communication unit 8.
Adopt this detector, it has operated the detecting system in this embodiment one, realizes keeping apart the high pressure of treating measurement system 3 through high voltage isolation module 2 to can effectively reduce the danger of staff when maintaining the detector, can also detect high-voltage motor winding's leakage current, resistance and absorption ratio through this detector simultaneously, the data accessible communication unit 8 of detection send it outward, thereby can reduce the maintenance frequency of detector, reduce the probability of occurrence of incident.
What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (10)
1. Automatic insulation detecting system of high-voltage motor winding, its characterized in that: comprising
The system comprises a current detection circuit, an insulation detection circuit, a control unit and a display unit, wherein 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 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 to detect the resistance value and the converted 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 to isolate high-voltage electricity in the system to be measured,
the boosting pre-detection unit is connected with the high-voltage isolation unit to boost the voltage of the insulation detection circuit;
the current detection circuit comprises a current detection and display control unit, wherein the current detection and display control unit is connected with a 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 the parameter values of the current detection circuit and the detected data;
the control unit comprises a first MCU which 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 to send the detected data to the outside.
2. The automatic insulation detection system for high-voltage motor windings according to claim 1, wherein: the high voltage isolation unit includes a coupler.
3. The automatic insulation detection system for high-voltage motor windings according to claim 1, wherein: 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 voltage of the boosting 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 connected with the display unit, and the second MCU and the third MCU are connected with the first MCU.
4. The automatic insulation detection system for high-voltage motor windings according to claim 1, wherein: the communication unit comprises a 485 communication module.
5. The automatic insulation detector for high-voltage motor windings, which adopts the automatic insulation detection system for high-voltage motor windings as claimed in any one of claims 1 to 4, is characterized in that: including instrument host computer and high-voltage isolation module, the detection unit in advance of stepping up resistance detection with display control unit the current detection with display control unit the display unit reaches 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 system of awaiting measuring first terminal and second terminal be connected, the high-voltage isolation module is connected with first terminal so that the high-voltage isolation module sets up between instrument host computer and the system of awaiting measuring, the second terminal is connected with the system of awaiting measuring through the mutual-inductor, the detection unit in advance of stepping up with the high-voltage isolation module is connected.
6. The automatic insulation detector for high-voltage motor windings according to claim 5, wherein: the instrument host comprises a wiring panel, wherein the first terminal and the second terminal are arranged on the wiring panel, the wiring panel is connected with each unit inside the instrument host, and the wiring panel further comprises a power supply wiring terminal for connecting a power supply, a communication wiring terminal for sending detected data outwards, a grounding terminal for grounding and a high-voltage insulation wiring terminal for being connected with a boosting pre-detection unit.
7. The automatic insulation detector for high-voltage motor windings according to claim 5, wherein: and an insulating material is arranged outside the high-voltage isolation module.
8. The automatic insulation detector for high-voltage motor windings according to claim 6, wherein: the wiring panel is characterized by further comprising a leakage current early-warning wiring terminal, an insulation resistance early-warning wiring terminal and a manual wiring terminal.
9. The automatic insulation detector for high-voltage motor windings according to claim 5, wherein: the instrument host also comprises a display panel connected with the display unit, wherein the display panel is provided with at least one resistance display digital tube group, at least one absorption ratio display digital tube group, at least one current display digital tube group and at least one voltage display digital tube group.
10. The automatic insulation detector for high-voltage motor windings according to claim 9, wherein: the display panel is also provided with an operation key for controlling the control unit, the operation key is connected with the control unit, and the operation key comprises a power switch key and a parameter setting key group for setting preset parameters in the instrument host.
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| CN202110933472.2A CN113589122B (en) | 2021-08-14 | 2021-08-14 | Automatic insulation detection system and detector for high-voltage motor winding |
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| CN202110933472.2A CN113589122B (en) | 2021-08-14 | 2021-08-14 | Automatic insulation detection system and detector for high-voltage motor winding |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080013233A (en) * | 2006-08-08 | 2008-02-13 | (주)케이제이다이나텍 | Auto insulation measuring apparatus of a motor and method |
| CN210720498U (en) * | 2019-09-12 | 2020-06-09 | 湖北金顿电气有限公司 | Insulation detector for high-voltage motor winding |
| CN111381136A (en) * | 2020-05-15 | 2020-07-07 | 山东威纳电气有限公司 | Device for detecting insulation of high-voltage motor on line |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050218906A1 (en) * | 2004-03-31 | 2005-10-06 | Younsi Abdelkrim K | System and method for monitoring of insulation condition |
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|---|---|---|---|---|
| KR20080013233A (en) * | 2006-08-08 | 2008-02-13 | (주)케이제이다이나텍 | Auto insulation measuring apparatus of a motor and method |
| CN210720498U (en) * | 2019-09-12 | 2020-06-09 | 湖北金顿电气有限公司 | Insulation detector for high-voltage motor winding |
| CN111381136A (en) * | 2020-05-15 | 2020-07-07 | 山东威纳电气有限公司 | Device for detecting insulation of high-voltage motor on line |
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