CN111610468A - Star-delta starting main loop wiring detection method - Google Patents
Star-delta starting main loop wiring detection method Download PDFInfo
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- CN111610468A CN111610468A CN202010480395.5A CN202010480395A CN111610468A CN 111610468 A CN111610468 A CN 111610468A CN 202010480395 A CN202010480395 A CN 202010480395A CN 111610468 A CN111610468 A CN 111610468A
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- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
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Abstract
The invention relates to a star-delta starting main loop wiring detection method, which comprises the following steps: simulating a motor star connection method, simultaneously rotating a motor rotor at a constant speed at a preset speed, and after the head of a three-phase winding of the motor in a star structure is completely short-circuited, connecting a first milliammeter in series with a star point of the three-phase winding; simulating a motor triangle connection method, simultaneously rotating a motor rotor at a constant speed at a preset speed, and connecting a second milliammeter in series at the position where the heads and the tails of any two windings are connected after three-phase windings of the motor with a triangle structure are connected in series; if the current measured by the second milliammeter is 0, the wiring of the three-phase winding of the motor and the wiring of the cable are correct; if the current measured by any one of the first milliammeter and the second milliammeter is not 0, the wiring of the three-phase winding and the wiring of the cable of the motor are wrong. The invention saves time without detaching cables, is simple and convenient to operate in actual test and inspection work, and ensures that the wiring of the stator winding of the motor and the wiring of the cables are correct.
Description
Technical Field
The invention relates to the technical field of safety monitoring, in particular to a star-delta starting main loop wiring detection method.
Background
At present, a large number of alternating current motors are used by factory enterprises, starting modes of the alternating current motors are various, star-delta starting is one of common methods, starting current can be effectively reduced by adopting the star-delta starting method, and particularly, the impact of the starting of the motors on a power grid can be reduced by adopting the star-delta starting method. The principle of star-delta starting is that when the motor is started, the three-phase windings of the motor are connected into star connection, after the motor is started, the three-phase windings of the motor are connected into delta connection, and then the motor operates in a delta connection mode. As the motor needs to be switched by a planetary triangle, 6 ends of a three-phase winding of the motor are required to be led out completely, two power cables are connected to the motor winding from a motor starting cabinet, one cable is connected with the head of the three-phase winding of the motor, the other cable is connected with the tail of the three-phase winding of the motor, 6 binding posts are arranged in a binding box of the motor, specific name marks of the winding are arranged on the 6 binding posts, the two cables are connected to the 6 binding posts of the motor according to a drawing, and the other ends of the two cables are connected to the inside of the starting cabinet of the motor. At present, the cable wiring work is completed by an installer, a debugging person is required to carry out test check before the motor is tested, because the resistance of a winding of the motor is very small, cable cores connected at two ends of the winding cannot be distinguished, a power cable needs to be disassembled for correction, and thus the workload is increased. In addition, specific name identification of 6 binding posts of the motor cannot be guaranteed to be correct, and potential safety hazards exist in wiring according to the identification of the binding posts. In summary, inspection according to conventional methods is labor and time consuming and does not guarantee that the main circuit is wired correctly.
Disclosure of Invention
Aiming at the defects of the existing test checking method, the invention provides the test checking method for the star-delta starting main loop.
The technical scheme adopted by the invention for solving the technical problems is as follows: a star-delta start main loop wiring detection method is constructed, and comprises the following steps:
before the motor is started, a motor star connection method is simulated, a motor rotor is rotated at a constant speed at a preset speed, a first milliammeter is connected in series with a star point of a three-phase winding after the head of the three-phase winding of the motor in a star structure is completely short-circuited, and the current measurement method of the first milliammeter is used for judging whether the connection of the three-phase winding of the motor and the connection of a cable are correct or not;
if the current measured by the first milliammeter is 0, simulating a triangular connection method of the motor, simultaneously rotating a rotor of the motor at a constant speed at a preset speed, connecting a second milliammeter in series at the position where the heads and the tails of any two windings are connected after three-phase windings of the motor in a triangular structure are connected in series, and judging whether the wiring of the winding of the motor and the wiring of a cable are correct or not by using a method for measuring the current by the second milliammeter;
if the current measured by the second milliammeter is 0, the wiring of the three-phase winding of the motor and the wiring of the cable are correct; if the current measured by any one of the first milliammeter and the second milliammeter is not 0, the wiring of the three-phase winding and the wiring of the cable of the motor are wrong.
Before the step of simulating the star connection method of the motor, the method also comprises the step of measuring the direct current resistance of the motor winding and the step of measuring the insulation resistance of the motor winding and the cable.
In the step of measuring the direct-current resistance of the motor winding, the direct-current resistances of three-phase windings of the motor are respectively measured by using a double-arm bridge, the current environment temperature is recorded, and when the direct-current resistance value of each phase winding of the motor exceeds 2% of the minimum value, the direct-current resistance value of the three-phase winding is judged to be abnormal.
In the step of measuring the insulation resistance of the motor winding and the cable, measuring the insulation resistance of each phase of winding and the connected cable of the motor by using a 1000V megaohm meter; during measurement, the end to end of the winding to be measured is short-circuited and then connected with the L end of the megohmmeter, meanwhile, the winding which is not to be measured is short-circuited and then connected with the shell and then connected with the E end of the megohmmeter, and the insulation resistance value is not lower than 0.5M omega at normal temperature.
Wherein, the milliammeter selects a common pointer multimeter, and the gear selects a direct current milliammeter gear.
The star-delta starting main loop wiring detection method implemented by the invention comprises the following steps: simulating a motor star connection method, simultaneously rotating a motor rotor at a constant speed at a preset speed, and after the head of a three-phase winding of the motor in a star structure is completely short-circuited, connecting a first milliammeter in series with a star point of the three-phase winding; simulating a motor triangle connection method, simultaneously rotating a motor rotor at a constant speed at a preset speed, and connecting a second milliammeter in series at the position where the heads and the tails of any two windings are connected after three-phase windings of the motor with a triangle structure are connected in series; if the current measured by the second milliammeter is 0, the wiring of the three-phase winding of the motor and the wiring of the cable are correct; if the current measured by any one of the first milliammeter and the second milliammeter is not 0, the wiring of the three-phase winding and the wiring of the cable of the motor are wrong. The star-delta starting main loop wiring detection is carried out through the method, cables do not need to be disassembled, time is saved, operation is simple and convenient in actual test and inspection work, and the wiring of the motor stator winding and the wiring of the cables are ensured to be correct.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic flow chart of a star-delta startup main loop wiring detection method provided by the invention.
Fig. 2 is a schematic wiring diagram detected in the star-delta start main loop wiring detection method provided by the invention.
Fig. 3 is a schematic diagram of a star connection method in the star-delta start main loop connection detection method provided by the invention.
Fig. 4 is a schematic diagram of a triangular wiring method in the star-delta start main loop wiring detection method provided by the invention.
Fig. 5 is a vector diagram of a three-phase winding when a star connection of a motor is simulated in the star-delta start main circuit connection detection method provided by the invention.
Fig. 6 is a vector diagram of three-phase windings when the star-delta start main circuit is connected in a delta connection mode of an analog motor in the method for detecting the star-delta start main circuit.
Fig. 7 is a position diagram of a series milliammeter in the star connection of the analog motor in the star-delta startup main circuit connection detection method provided by the invention.
Fig. 8 is a position diagram of a series milliammeter in the process of connecting the triangular type of the analog motor in the star-delta starting main circuit wiring detection method provided by the invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a method for detecting a star delta start main loop wiring provided by the present invention, which includes the steps of:
s110: before the motor is started, a motor star connection method is simulated, a motor rotor is rotated at a constant speed at a preset speed, after the head of a three-phase winding of the motor in a star structure is completely short-circuited, a first milliammeter is connected in series with a star point of the three-phase winding, and whether the connection of the three-phase winding of the motor and the connection of a cable are correct or not is judged by a method for measuring current by the first milliammeter.
S120: if the current measured by the first milliammeter is 0, a motor triangle connection method is simulated, a motor rotor is rotated at a constant speed at a preset speed, after three-phase windings of the motor with a triangle structure are connected in series, a second milliammeter is connected in series at the position where the heads and the tails of any two windings are connected, and whether the wiring of the windings of the motor and the wiring of cables are correct is judged by a method for measuring the current by the second milliammeter.
S130: if the current measured by the second milliammeter is 0, the wiring of the three-phase winding of the motor and the wiring of the cable are correct; if the current measured by any one of the first milliammeter and the second milliammeter is not 0, the wiring of the three-phase winding and the wiring of the cable of the motor are wrong.
Before the step of simulating the star connection method of the motor, the method also comprises the step of measuring the direct current resistance of the motor winding and the step of measuring the insulation resistance of the motor winding and the cable.
In the step of measuring the direct-current resistance of the motor winding, the direct-current resistances of three-phase windings of the motor are respectively measured by using a double-arm bridge, the current environment temperature is recorded, and when the direct-current resistance value of each phase winding of the motor exceeds 2% of the minimum value, the direct-current resistance value of the three-phase winding is judged to be abnormal.
In the step of measuring the insulation resistance of the motor winding and the cable, measuring the insulation resistance of each phase of winding and the connected cable of the motor by using a 1000V megaohm meter; during measurement, the end to end of the winding to be measured is short-circuited and then connected with the L end of the megohmmeter, meanwhile, the winding which is not to be measured is short-circuited and then connected with the shell and then connected with the E end of the megohmmeter, and the insulation resistance value is not lower than 0.5M omega at normal temperature.
Wherein, the milliammeter selects a common pointer multimeter, and the gear selects a direct current milliammeter gear.
The method is used for detecting the wiring of the starting circuit of the motor. As shown in fig. 2, the terminals of the stator winding of the motor M are respectively U1, V1, W1, U2, V2 and W2, wherein U1, V1 and W1 are motor three-phase winding heads, and U2, V2 and W2 are motor three-phase winding tails; three terminals of U1, V1 and W1 are used for connecting an alternating current three-phase line, and a contactor KM1, an air switch QF and a thermal relay FR are arranged on a connecting line between the alternating current three-phase line and the three terminals of U1, V1 and W1; a contactor KM2 is arranged on an output line of three terminals of U2, V2 and W2; u1 and W2, V1 and U2, and W1 and V2 are connected through a contactor KM 3; the input ends of the contactor KM3 are L1, L2 and L3, and the output ends of the contactor KM3 are T1, T2 and T3; l1, L2 and L3 are respectively connected to W1, V1 and U1, and T1, T2 and T3 are respectively connected to V2, U2 and W2.
Early preparation work: the work of the grounding grid is finished, and the design requirements are met; two power cables inside the starting cabinet and the motor junction box are started to finish wiring work, and the outer steel belt of the cable is reliably connected with the grounding grid; the shell of the starting cabinet and the shell of the motor are reliably connected with a grounding grid; the cables connected to the upper surfaces of the binding posts of the motor do not need to be disassembled during test and inspection; and starting the empty QF opening state of the cabinet.
When the motor is normally started, the air switch QF is closed, the control contactor KM1 and the contactor KM2 work simultaneously, so that the motor is started according to a star connection method, and the connection schematic diagram is shown in fig. 3. After the starting current of the motor is reduced, the contactor KM2 is controlled to be switched off, the contactor KM3 works, namely the contactor KM1 and the contactor KM3 are in a working state, the motor winding runs according to a triangular connection method, and the wiring schematic diagram is shown in FIG. 4. If the overload condition of the motor occurs, the thermal relay FR acts, and an alarm signal is sent out; if the motor and the cable have short circuit, grounding and other fault conditions, the QF is tripped in an idle mode, meanwhile, the contactor KM1 and the contactor KM3 are switched off, and the motor stops running.
In fig. 2, the three-phase winding groups of the motor are respectively U1-U2, V1-V2 and W1-W2, wherein U1, V1 and W1 are the heads of the three-phase winding groups of the motor, and U2, V2 and W2 are the tails of the three-phase winding groups of the motor. In fig. 2, the air switch QF of the star-delta start main circuit, the contactor KM1, the thermal relay FR, the contactor KM2 and the contactor KM3 are connected when the electrical equipment manufacturers leave the factory, an installation unit connects the motor and the start cabinet through two power cables, one power cable of the start cabinet is connected with the three-phase winding heads U1, V1 and W1 of the motor, and the other power cable of the start cabinet is connected with the three-phase winding tails U2, V2 and W2 of the motor.
Firstly, visually inspecting whether wiring is reliable or not, if the wiring is loosened and needs to be fastened, then measuring the direct current resistance of the motor winding by using a double-arm bridge, respectively measuring the direct current resistance of the motor winding U1-U2, V1-V2 and W1-W2, and recording the current environment temperature, wherein the direct current resistance values of the windings of all phases of the motor are mutually different and should not exceed 2% of the minimum value, otherwise, relevant processing is needed until the wiring is qualified. The direct-current resistance of the winding is measured according to the motor with the national standard capacity of more than 100kW, and the direct-current resistance of the motor less than 100kW does not need to be measured.
Measuring the insulation resistance of motor windings and cables using a 1000V megohmmeter, measuring the insulation resistance of motor windings U1-U2 and connected cables using 1.5mm2The bare copper wire is used for connecting the U1-U2 to the L end of the megger after being short-circuited, and simultaneously the V1-V2 and the W1-W2 are used for 1.5mm2And after the bare copper wires are short-circuited, the bare copper wires are connected with the shell of the motor and then connected to the E end of the megohmmeter, and meanwhile, the insulation conditions of the U1-U2 windings and connected cables are checked. The insulation resistance of the motor windings V1-V2 and W1-W2 is measured by the same method, and the insulation resistance value is not lower than 0.5M omega at normal temperature.
And after the detection is qualified, the wiring of the stator winding is detected.
The material of the iron core of the rotor of the motor is made of multiple layers of silicon steel sheets, and the silicon steel sheets have a certain amount of residual magnetism, so that the motor can be regarded as a small generator, and the residual magnetism magnetic field of the rotor cuts a three-phase winding of the motor to generate weak electric energy by rotating the rotor of the motor.
In FIG. 2, input ends L1, L2 and L3 of a contactor KM3 are correspondingly connected with the binding posts of W1, V1 and U1 of the motor through cables, and output ends T1, T2 and T3 of the contactor KM3 are correspondingly connected with V2, U2 and W2 of the motor through cables.
When a star connection method is simulated, the input ends L1, L2 and L3 of the contactor KM3 pass through 1.5mm2The bare copper wires are led out after being all short-circuited and are connected with any one meter pen of the multimeter, T1 ', T2 ' and T3 ' at the output end of the contactor KM2 are short-circuited in the starting cabinet and are 1.5mm in length2The bare copper wire is arbitrarily connected to one of terminals of the KM2 output terminals T1 ', T2 ' and T3 ' and is further connected with another meter pen of the multimeter, the multimeter selects a common pointer multimeter, and the gear selects a direct current 100mA gear. Therefore, after the head of the three-phase winding of the motor is completely short-circuited, a milliammeter is connected in series with the star point of the three-phase winding, a tool for a starting cabinet presses down the main contact of the contactor KM2, the action of the contactor KM2 is simulated, the rotor of the motor is rotated at a constant speed, the swinging amplitude of the pointer of the multimeter is observed, and the maximum swinging amplitude value is recorded. If the star connection of the motor windings is correct and the power cable connection is also correct, the theoretical value is zero, and if the rotation of the rotor cannot be guaranteed to be constant, slight swinging is possible.
In actual work, if the 100mA gear of the multimeter is damaged or the residual magnetism of a motor rotor is too weak to generate power, correct judgment cannot be made, so that whether the 100mA gear display of the multimeter is correct needs to be verified under the condition that the motor generates power. Removing the short-circuited bare copper wires L1, L2 and L3 at the input end of the contactor KM3, and using 1.5mm2Bare copper wires are randomly connected to one of terminals of L1, L2 and L3 and then connected with an original meter pen, the other meter pen is kept in an original state, the rotor of the motor is rotated at a constant speed again, the swing amplitude of a pointer of the universal meter is observed, the maximum swing amplitude value is recorded, the pointer of the universal meter swings left and right theoretically, the swing amplitude is large, the swing amplitudes of two times of tests are compared, and if the swing amplitude of the next time of test is large, the pointer swings left and right in the left and right directionsAnd if the degree is more than 10 times of the amplitude of the first swing, the wiring of the stator winding of the motor and the wiring of the cable are correct. Releasing the simulation action state of the contactor KM2, connecting the contactors KM3 and KM2 with the contactor KM3 and KM2 in the length of 1.5mm2The bare copper wires are completely removed and are restored to the initial state.
Fig. 5 is a vector diagram of three-phase windings in the case of a star connection of a simulated motor, and fig. 7 is a position diagram of a series milliammeter in the case of a star connection of a simulated motor. In fig. 5, windings V2, U2 and W2 of the motor are connected to form a star point, Iu, Iv and Iw in fig. 7 are currents of stator windings U1-U2, V1-V2 and W1-W2 of the motor respectively, and V1, U1 and W2 of the windings of the motor are connected to form a total current I, wherein the total current I is a vector sum of three current sources, I = Iu + Iv + Iw =0 because currents emitted by three-phase windings are symmetrical 120 °, and the total current I is slightly larger than 0 because a rotor of the motor cannot rotate at a constant speed in test, and a pointer of the multimeter can slightly swing. When the multimeter is verified whether the 100mA gear display of the multimeter is correct, the multimeter is connected with the current of one phase of the three-phase winding, the total current I is increased, I = Iu > >0 (or I = Iv > >0 or I = Iw > > 0), and the amplitude of the multimeter pointer swing is large.
A method for simulating the triangular connection of a motor uses 1.5mm for the input end L1 of a contactor KM3 and the output end T1 of KM32The bare copper wire is in short circuit, and 1.5mm is used for the input end L2 of the contactor KM3 and the output end T2 of the contactor KM32Short circuit, 1.5mm is used to input end L3 of contactor KM32The bare copper wire is connected with any one meter pen of the multimeter, and the output end T3 of the contactor KM3 is 1.5mm2The bare copper wire is connected with another meter pen of the multimeter, the gear of the multimeter selects direct current 100mA gear, thus a milliammeter is connected in series at the opening of a three-phase winding of the motor, a rotor of the motor is rotated at a constant speed, the swinging amplitude of a pointer of the multimeter is observed, and the maximum swinging amplitude value is recorded. If the connection method of the motor winding triangle is correct and the power cable connection is also correct, if the uniform rotation of the rotor cannot be guaranteed, the pointer of the multimeter can generate small swing amplitude.
If the multimeter is damaged at 100mA gear or the residual magnetism of the motor is too weak to generate power, correct judgment cannot be made, so that power generation at the motor is neededIn case, the 100mA gear display of the multimeter is verified to be correct. 1.5mm above the input end L3 of the contactor KM32The bare copper wires were disconnected and connected to L1 or L2 while keeping L2 and T2 of contactor KM3 in a short circuit state and L1 and T1 of contactor KM3 in a short circuit state. And rotating the rotor of the motor at a constant speed again, observing the swinging amplitude of the pointer of the universal meter, recording the maximum swinging amplitude value, theoretically swinging the pointer of the universal meter left and right with large swinging amplitude, comparing the swinging amplitudes of the two tests, and if the swinging amplitude of the latter time is more than 10 times of the swinging amplitude of the first time, indicating that the wiring of the stator winding of the motor and the wiring of the cable are correct. 1.5mm above contactor KM32The bare copper wires are completely removed and are restored to the initial state.
Fig. 6 is a vector diagram of a three-phase winding in a case of a pseudo-motor delta connection, and fig. 8 is a position diagram of a series milliammeter in a case of a pseudo-motor delta connection. In fig. 6, windings U2 of the motor are connected with V1, V2 is connected with W1, U1 is not connected with W2, an opening is formed between U1 and W2, milliammeters are connected in series between U1 and W2, Iu, Iv and Iw in fig. 8 are currents of motor stator windings U1-U2, V1-V2 and W1-W2 respectively, the milliammeters are connected in series in three-phase windings, the three-phase windings form a total current I, the total current I is a vector sum of three current sources, I = Iu + Iv + Iw, since currents emitted by the three-phase windings are 120 degrees symmetrical, I = Iu + Iv + Iw =0, since the motor rotor cannot be guaranteed to rotate at a constant speed during testing, the total current I is slightly larger than 0, and the multimeter pointer can slightly swing. When the display of the 100mA gear of the multimeter is verified to be correct, if the multimeter is changed from the original L3 to L1, I = Iw > >0, and if the multimeter is changed from the original L3 to L2, I = Iv + Iw > >0, the total current I is increased in the two cases, and the amplitude of the swinging of the multimeter pointer is large.
The gear of the multimeter is a direct current 100mA gear, when the capacity of some motors is small or the residual magnetism of the rotor of the motor is weak, when the multimeter is verified under the condition of motor power generation, the swing amplitude of a pointer is small, a direct current 10mA gear can be used, or a direct current 1mA gear can be used, and the multimeter is adjusted according to specific conditions.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A star-delta start main loop wiring detection method is characterized by comprising the following steps:
before the motor is started, a motor star connection method is simulated, a motor rotor is rotated at a constant speed at a preset speed, a first milliammeter is connected in series with a star point of a three-phase winding after the head of the three-phase winding of the motor in a star structure is completely short-circuited, and the current measurement method of the first milliammeter is used for judging whether the connection of the three-phase winding of the motor and the connection of a cable are correct or not;
if the current measured by the first milliammeter is 0, simulating a triangular connection method of the motor, simultaneously rotating a rotor of the motor at a constant speed at a preset speed, connecting a second milliammeter in series at the position where the heads and the tails of any two windings are connected after three-phase windings of the motor in a triangular structure are connected in series, and judging whether the wiring of the winding of the motor and the wiring of a cable are correct or not by using a method for measuring the current by the second milliammeter;
if the current measured by the second milliammeter is 0, the wiring of the three-phase winding of the motor and the wiring of the cable are correct; if the current measured by any one of the first milliammeter and the second milliammeter is not 0, the wiring of the three-phase winding and the wiring of the cable of the motor are wrong.
2. The star-delta enabled main loop connection detection method according to claim 1, further comprising the step of measuring the direct current resistance of the motor winding and the step of measuring the insulation resistance of the motor winding and the cable before the step of simulating the star connection method of the motor.
3. The star-delta starting main loop connection detecting method according to claim 2, wherein in the step of measuring the direct current resistance of the winding of the motor, the direct current resistances of the three-phase windings of the motor are respectively measured using a double-arm bridge, and the current ambient temperature is recorded, and when the direct current resistance value of each phase winding of the motor exceeds 2% of the minimum value, it is determined that the direct current resistance values of the three-phase windings are abnormal.
4. The star-delta start primary loop wiring detection method according to claim 2, wherein in the step of measuring the insulation resistance of the winding and the cable of the motor, the insulation resistance of each phase winding and the connected cable of the motor is measured using a 1000V megameter; during measurement, the end to end of the winding to be measured is short-circuited and then connected with the L end of the megohmmeter, meanwhile, the winding which is not to be measured is short-circuited and then connected with the shell and then connected with the E end of the megohmmeter, and the insulation resistance value is not lower than 0.5M omega at normal temperature.
5. The star-delta startup main loop wiring detection method according to claim 2, characterized in that a common pointer multimeter is selected as the milliammeter, and a direct current milliampere gear is selected as the gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010480395.5A CN111610468A (en) | 2020-05-30 | 2020-05-30 | Star-delta starting main loop wiring detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010480395.5A CN111610468A (en) | 2020-05-30 | 2020-05-30 | Star-delta starting main loop wiring detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115009949A (en) * | 2022-07-15 | 2022-09-06 | 佛山市顺德区鼎力电气有限公司 | Elevator star-sealed state detection method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096017A (en) * | 2010-11-26 | 2011-06-15 | 河南省电力公司洛阳供电公司 | Method for judging corresponding terminals of three-phase asynchronous motor winding with universal meter |
| CN105262376A (en) * | 2015-10-20 | 2016-01-20 | 珠海格力电器股份有限公司 | Star-delta starting circuit for three-phase motor and starting method thereof |
-
2020
- 2020-05-30 CN CN202010480395.5A patent/CN111610468A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096017A (en) * | 2010-11-26 | 2011-06-15 | 河南省电力公司洛阳供电公司 | Method for judging corresponding terminals of three-phase asynchronous motor winding with universal meter |
| CN105262376A (en) * | 2015-10-20 | 2016-01-20 | 珠海格力电器股份有限公司 | Star-delta starting circuit for three-phase motor and starting method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 《粮仓电气设备》编写组: "《粮仓电气设备》", 31 March 1993 * |
| 孙怀川: "《新编实用电工技术》", 31 May 1995 * |
| 徐鸿泽: "《低压电工作业》", 30 November 2011 * |
| 殷志坚 等: "《电路与电子技术实验》", 31 August 2017 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115009949A (en) * | 2022-07-15 | 2022-09-06 | 佛山市顺德区鼎力电气有限公司 | Elevator star-sealed state detection method |
| CN115009949B (en) * | 2022-07-15 | 2022-11-08 | 佛山市顺德区鼎力电气有限公司 | Elevator star-sealing state detection method |
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