CN105807147B - Nuclear power station three-phase asynchronous motor phase sequence testing method and device - Google Patents

Nuclear power station three-phase asynchronous motor phase sequence testing method and device Download PDF

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Publication number
CN105807147B
CN105807147B CN201610305907.8A CN201610305907A CN105807147B CN 105807147 B CN105807147 B CN 105807147B CN 201610305907 A CN201610305907 A CN 201610305907A CN 105807147 B CN105807147 B CN 105807147B
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China
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phase
asynchronous motor
stator winding
phase asynchronous
sequence
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CN105807147A (en
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苏磊
任延宝
王安平
张永明
张凌霄
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/18—Indicating phase sequence; Indicating synchronism
    • 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

Abstract

The invention discloses a method and a device for testing the phase sequence of a three-phase asynchronous motor of a nuclear power station. The device comprises: the detection unit is electrically connected with the external connection end of the second phase stator winding or the third phase stator winding and used for measuring the change trend of the output current or the potential of the external connection end of the second phase stator winding or the third phase stator winding when the rotor of the three-phase asynchronous motor is rotated in a test magnetic field and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule. The device has simple structure and low manufacturing price, and can be prepared in a large scale, thereby saving the cost; the phase sequence of the three-phase asynchronous motor can be directly tested under the conditions that the three-phase asynchronous motor is not connected with a three-phase alternating current power supply and is not electrified, the testing operation is simple and convenient, and the testing result is accurate and efficient.

Description

Nuclear power station three-phase asynchronous motor phase sequence testing method and device
Technical Field
The invention relates to the technical field of motor phase sequence testing, in particular to a method and a device for testing a phase sequence of a three-phase asynchronous motor of a nuclear power station.
Background
The three-phase asynchronous motor is a motor which is powered by a 380V three-phase alternating current power supply (with a phase difference of 120 degrees) which is connected at the same time, and has wide application in nuclear power stations. The three-phase asynchronous motor can be classified into a safety class (i.e. 1E class) three-phase asynchronous motor according to different safety classes, such as: the three-phase asynchronous motor is used for finishing emergency shutdown of a reactor, containment isolation, emergency cooling of a reactor core, residual heat removal of the reactor, heat removal of a reactor plant and prevention of radioactive substances from being discharged to the surrounding environment; and a non-safety class (i.e., NNS class or NC class) three-phase asynchronous motor.
The direction of rotation of a three-phase asynchronous motor is generally determined by the phase sequence of the three-phase ac power supply and the phase sequence of the three-phase asynchronous motor. The phase sequence of the three-phase asynchronous motor is a sequential sequence that the instantaneous value of alternating current flowing through a three-phase stator winding of the motor changes from a negative value to a positive value and passes through a zero value; the phase sequence of a three-phase alternating current power supply refers to the sequential order in which the instantaneous value of the three-phase alternating current output by the power supply changes from a negative value to a positive value through a zero value. When the phase sequence of the three-phase asynchronous motor is the same as that of the three-phase alternating current power supply, the three-phase asynchronous motor rotates forwards (namely, when viewed from the direction from the driving end to the non-driving end of the three-phase asynchronous motor, the three-phase asynchronous motor rotates clockwise, and similarly, the three-phase asynchronous motor rotates anticlockwise to rotate backwards); when the phase sequence of the three-phase asynchronous motor is opposite to that of the three-phase alternating current power supply, the three-phase asynchronous motor can be reversed. In the actual installation process of the three-phase asynchronous motor, since the phase sequence of the three-phase asynchronous motor is unknown, after the three-phase alternating current power supply is switched on, the rotation direction may be opposite to the expected rotation direction.
In order to solve the problems, an installer generally firstly energizes a three-phase asynchronous motor which is well connected with a cable of a three-phase alternating-current power supply to test the motor steering, if the steering is not expected, the connection mode of two cables is randomly exchanged, but the number of the three-phase asynchronous motors adopted in a nuclear power station is large, the steering efficiency of the three-phase asynchronous motor is low, human resources are consumed, some three-phase asynchronous motors cannot be reversed, the motor is damaged when the three-phase asynchronous motors are reversed, and the motor steering cannot be ensured by adopting the mode. In addition, some three-phase asynchronous motors are equipped with a motor phase sequence protector to ensure the correct motor steering, but the provision of a motor phase sequence protector for a three-phase asynchronous motor increases the cost, and particularly, in the case where a large number of three-phase asynchronous motors need to be assembled in a nuclear power plant, the provision of a motor phase sequence protector for each three-phase asynchronous motor increases the cost and pressure and is not cost-effective.
Disclosure of Invention
The invention provides a phase sequence testing method and device for a three-phase asynchronous motor of a nuclear power station, aiming at the problems that the existing phase sequence testing method for the three-phase asynchronous motor is low in efficiency, and cost and pressure are high due to the fact that a motor phase sequence protector is arranged for ensuring the correct steering of the three-phase asynchronous motor.
The technical scheme provided by the invention for the technical problem is as follows:
in one aspect, a phase sequence testing device for a three-phase asynchronous motor of a nuclear power plant is provided, and the device comprises:
the positive pole of the direct current power supply is electrically connected with the external connection end of the first-phase stator winding of the three-phase asynchronous motor, the negative pole of the direct current power supply is respectively electrically connected with the external connection ends of the second-phase stator winding and the third-phase stator winding of the three-phase asynchronous motor and used for generating a test magnetic field for the three-phase asynchronous motor, and the external connection end is a port for connecting the stator winding with an external circuit;
the detection unit is electrically connected with the external connection end of the second-phase stator winding or the third-phase stator winding of the three-phase asynchronous motor, and is used for measuring the change trend of the output current or the potential of the external connection end of the second-phase stator winding or the third-phase stator winding when the rotor of the three-phase asynchronous motor rotates in the test magnetic field and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule.
In the above apparatus of the present invention, the detecting unit is configured to determine that a phase sequence of the three-phase asynchronous motor is the same as the first direction when the rotor of the three-phase asynchronous motor rotates in the first direction and detects that an output current of an external terminal of the second-phase stator winding increases first and then decreases; when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
the detection unit is used for judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the second-phase stator winding is detected to be increased and then reduced; and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output current of the external end of the second-phase stator winding is detected to be increased after being reduced, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
In the above apparatus of the present invention, the detection unit is a bidirectional pointer type milliampere meter or a digital multimeter, a negative electrode of the detection unit is electrically connected to a negative electrode of the dc power supply, and a positive electrode of the detection unit is electrically connected to an external terminal of the second-phase stator winding.
In the above device of the present invention, the detecting unit is configured to determine that a phase sequence of the three-phase asynchronous motor is the same as the first direction when the rotor of the three-phase asynchronous motor is rotated in the first direction and the external connection end output potential of the second-phase stator winding is detected to increase first and then decrease; when the rotor of the three-phase asynchronous motor rotates in the first direction and the output potential of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
the detection unit is used for judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and the output potential of the external end of the second-phase stator winding is detected to be increased and then decreased; and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output potential of the external end of the second-phase stator winding is detected to be increased after being reduced, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
In the above apparatus of the present invention, the detection unit includes a test resistor and a voltmeter or a digital multimeter, one end of the test resistor is electrically connected to the dc power supply, and the other end of the test resistor is electrically connected to the external terminal of the second-phase stator winding, a negative electrode of the voltmeter or the digital multimeter is electrically connected to a negative electrode of the dc power supply, and a positive electrode thereof is electrically connected to the external terminal of the second-phase stator winding.
In the above apparatus of the present invention, the detecting unit is configured to determine that a phase sequence of the three-phase asynchronous motor is opposite to the first direction when the rotor of the three-phase asynchronous motor rotates in the first direction and detects that an output current of an external terminal of the third-phase stator winding increases first and then decreases; when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
the detection unit is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and detects that the output current of the external end of the third-phase stator winding is increased and then reduced; and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output current of the external end of the third-phase stator winding is detected to be reduced firstly and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
In the above apparatus of the present invention, the detection unit is a bidirectional pointer type milliampere meter or a digital multimeter, a negative electrode of the detection unit is electrically connected to a negative electrode of the dc power supply, and a positive electrode of the detection unit is electrically connected to an external terminal of the third phase.
In the above device of the present invention, the detecting unit is configured to determine that a phase sequence of the three-phase asynchronous motor is opposite to the first direction when the rotor of the three-phase asynchronous motor is rotated in the first direction and the output potential of the external terminal of the third-phase stator winding is detected to increase first and then decrease; when the rotor of the three-phase asynchronous motor rotates in the first direction and the output potential of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
the detection unit is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and detects that the output potential of the external end of the third-phase stator winding is increased and then decreased; and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output potential of the external end of the third-phase stator winding is detected to be increased after being reduced, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
In the above apparatus of the present invention, the detection unit includes a test resistor and a voltmeter or a digital multimeter, one end of the test resistor is electrically connected to the dc power supply, and the other end of the test resistor is electrically connected to the external terminal of the third phase, a negative electrode of the voltmeter or the digital multimeter is electrically connected to a negative electrode of the dc power supply, and a positive electrode thereof is electrically connected to the external terminal of the third phase.
In the above-mentioned apparatus of the present invention, the apparatus further comprises:
a shell provided with binding posts, wherein the direct current power supply and the detection unit are arranged in the shell, a display surface of the detection unit is arranged on the surface of the shell, a positive electrode and a negative electrode of the direct current power supply and two input ports of the detection unit are electrically connected with the respective corresponding binding posts,
a plug matched with the binding post is arranged at one end of the cable, an alligator clip is arranged at the other end of the cable,
and the power switch is arranged on the surface of the shell and used for controlling the switch of the direct-current power supply.
In the above-mentioned apparatus of the present invention, the apparatus further comprises:
and the display unit is electrically connected with the detection unit and is used for displaying the detected phase sequence of the three-phase asynchronous motor.
In another aspect, a phase sequence testing method for a three-phase asynchronous motor of a nuclear power plant is provided, and the method includes:
the method comprises the steps that an external connection end of a first-phase stator winding of a three-phase asynchronous motor to be tested is electrically connected with a positive pole of a direct-current power supply, and external connection ends of a second-phase stator winding and a third-phase stator winding of the three-phase asynchronous motor are both electrically connected with a negative pole of the direct-current power supply;
rotating a rotor of the three-phase asynchronous motor;
and detecting the change trend of the output current or the potential of the external end of the second-phase stator winding or the third-phase stator winding, and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule.
In the above method of the present invention, the determining the phase sequence of the three-phase asynchronous motor according to a preset phase sequence determination rule includes:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the second-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the second-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction;
and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output current of the external end of the second-phase stator winding is detected to be increased after being reduced, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
In the above method of the present invention, the detecting a variation trend of an output current of an external terminal of the second-phase stator winding includes:
and detecting the change trend of the output current of the external end of the second-phase stator winding by adopting a bidirectional pointer type milliampere ammeter or a digital multimeter.
In the above method of the present invention, the determining the phase sequence of the three-phase asynchronous motor according to a preset phase sequence determination rule includes:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the second-phase stator winding is detected to increase and then decrease, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in the first direction and the output potential of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output potential of the external end of the second-phase stator winding is detected to increase and then decrease, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction;
and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output potential of the external end of the second-phase stator winding is detected to be increased after being reduced, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
In the above method of the present invention, the detecting a trend of the output potential of the external connection terminal of the second-phase stator winding includes:
and measuring the voltage variation trend on a test resistor connected in series with the external connection end of the second-phase stator winding by adopting a voltmeter or a digital multimeter.
In the above method of the present invention, the determining the phase sequence of the three-phase asynchronous motor according to a preset phase sequence determination rule includes:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the third-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the third-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction;
and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output current of the external end of the third-phase stator winding is detected to be reduced firstly and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
In the above method of the present invention, the detecting a variation trend of an output current of an external terminal of the third phase stator winding includes:
and detecting the change trend of the output current of the external end of the third-phase stator winding by adopting a bidirectional pointer type milliampere ammeter or a digital multimeter.
In the above method of the present invention, the determining the phase sequence of the three-phase asynchronous motor according to a preset phase sequence determination rule includes:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the third-phase stator winding is detected to increase firstly and then decrease, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in the first direction and the output potential of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output potential of the external end of the third-phase stator winding is detected to increase firstly and then decrease, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction;
and when the rotor of the three-phase asynchronous motor rotates according to the second direction and the output potential of the external end of the third-phase stator winding is detected to be increased after being reduced, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
In the above method of the present invention, the detecting a trend of the output potential of the external terminal of the third-phase stator winding includes:
and measuring the voltage variation trend on a test resistor connected in series with the external connection end of the third phase stator winding by using a voltmeter or a digital multimeter.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the method comprises the steps that a direct-current power supply is arranged in a phase sequence testing device of the three-phase asynchronous motor, the positive electrode of the direct-current power supply is electrically connected with the external connection end of a first-phase stator winding of the three-phase asynchronous motor, and the negative electrode of the direct-current power supply is electrically connected with the external connection ends of a second-phase stator winding and a third-phase stator winding of the three-phase asynchronous motor respectively so as to generate a testing magnetic field in the stator windings of the three-phase asynchronous motor; the device is also provided with a detection unit used for measuring the change trend of the output current or the potential of the external end of the second-phase stator winding or the third-phase stator winding when the rotor of the three-phase asynchronous motor rotates in the test magnetic field and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule. The phase sequence testing device for the three-phase asynchronous motor has the advantages of simple structure, low manufacturing price and high economy, and can be prepared in a large scale, so that the cost is saved; and the device can directly test the phase sequence of the three-phase asynchronous motor under the condition that the three-phase asynchronous motor is not connected with a three-phase alternating current power supply and is not electrified, the condition that the three-phase asynchronous motor damages the motor due to starting reversal can not occur, and the device is simple and convenient in test operation, accurate and efficient in test result and has strong practicability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a phase sequence testing device for a three-phase asynchronous motor of a nuclear power plant according to a first embodiment of the present invention;
fig. 2 is a schematic view of a connection structure between a phase sequence testing device and a three-phase asynchronous motor of a nuclear power plant according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of an operating principle of a phase sequence testing device for a three-phase asynchronous motor of a nuclear power plant according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a phase sequence testing device for a three-phase asynchronous motor of a nuclear power plant according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a phase sequence testing device for a three-phase asynchronous motor of a nuclear power plant according to a first embodiment of the present invention;
fig. 6 is a flowchart of a phase sequence testing method for a three-phase asynchronous motor of a nuclear power plant according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
The embodiment of the invention provides a phase sequence testing device for a three-phase asynchronous motor of a nuclear power station, and the device comprises the following components, with reference to fig. 1:
the testing device comprises a direct current power supply 1, wherein the positive electrode of the direct current power supply 1 is electrically connected with the external connection end of a first-phase stator winding of the three-phase asynchronous motor, the negative electrode of the direct current power supply 1 is respectively electrically connected with the external connection ends of a second-phase stator winding and a third-phase stator winding of the three-phase asynchronous motor and used for generating a testing magnetic field for the three-phase asynchronous motor, and the external connection end is a port for connecting the stator winding with an external circuit.
The detection unit 2 is electrically connected with the external connection end of the second phase stator winding or the third phase stator winding of the three-phase asynchronous motor, and is used for measuring the change trend of the output current or the potential of the external connection end of the second phase stator winding or the third phase stator winding when the rotor of the three-phase asynchronous motor rotates in the test magnetic field and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule.
It should be noted that the three-phase asynchronous motor generally has three-phase stator windings, and the "first-phase stator winding, second-phase stator winding, and third-phase stator winding" in this embodiment is used to distinguish the phase stator windings, and is not used to describe a specific order or a sequence order, that is, the first-phase stator winding, the second-phase stator winding, and the third-phase stator winding may all refer to any one of the three-phase stator windings, and this is not limited here.
In addition, each phase of stator winding in the three-phase asynchronous motor has two ports, and the three-phase stator winding generally has two connection modes, namely a star connection mode and a triangle connection mode. In the present embodiment, as shown in fig. 2, the three-phase stator windings of the three-phase asynchronous motor are AX, BY, CZ, respectively, and if it is assumed that the clockwise direction in fig. 2 is a positive sequence (counterclockwise is a reverse sequence), the phase sequence of the three-phase stator windings is a positive sequence, for example: two ports of the first-phase stator winding are respectively a port a and a port X, two ports of the second-phase stator winding are respectively a port B and a port Y, and two ports of the third-phase stator winding are respectively a port C and a port Z (the two-phase stator winding is exchanged arbitrarily and then in reverse order), then specifically:
when the three-phase stator winding adopts the star connection mode, the port X, the port Y and the port Z are connected together, the port a, the port B and the port C are respectively external terminals corresponding to the stator winding, in this embodiment, the port a is electrically connected with a positive electrode of the direct-current power supply 1, the port B and the port C are both electrically connected with a negative electrode of the direct-current power supply 1, the port a has current flowing in, the port B and the port C have current flowing out, and therefore it can be deduced that the port X has current flowing out, and the port Y and the port Z have current flowing in.
When the three-phase stator winding adopts a triangular connection mode, the port A is electrically connected with the port Z, the port B is electrically connected with the port X, the port C is electrically connected with the port Y, the port A, the port B and the port C are respectively external terminals corresponding to the stator winding, in the embodiment, the port A is electrically connected with a positive electrode of the direct-current power supply 1, the port B and the port C are both electrically connected with a negative electrode of the direct-current power supply 1, the port A has current flowing in, the port B and the port C have current flowing out, and therefore, the fact that the port X has current flowing out and the port Y and the port Z have current flowing in can be inferred. It is thus known that the direction of the current in the three-phase stator winding is independent of its connection.
The three-phase asynchronous motor rotor in the test magnetic field can be a winding type and a squirrel cage type, and can be simplified into a plurality of axisymmetric cutting magnetic field frames 30 shown in fig. 2, and the plurality of cutting magnetic field frames 30 are uniformly distributed around the same symmetric axis. When the rotor is rotated, the rotor has a process of first accelerating rotation and then decelerating to stop rotating.
Because the direction of current in the three-phase stator winding is irrelevant to the wiring mode, the current flows into the port A, the current flows out of the port B and the port C, the current flows out of the port X, and the current flows into the port Y and the port Z. Assume that the magnetic field generated by the first-phase stator winding (i.e., stator winding AX) is BUThe direction is vertical to the closed coil plane of the first phase stator winding, and the magnetic field generated BY the second phase stator winding (namely the stator winding BY) is BVThe direction is vertical to the closed coil plane of the second phase stator winding, and the magnetic field generated by the third phase stator winding (i.e. the stator winding CZ) is BWAnd the direction is perpendicular to the closed coil plane of the third stator winding. Wherein, BU、BV、BWAll are test magnetic fields.
When the rotor is rotated in the forward direction (i.e., clockwise), as shown in FIG. 3, according to the right-hand rule, the rotorCutting magnetic field frame 30 in cutting magnetic field BUWhen is generating and BUA magnetic field B1 with a vertical direction, which generates a magnetic field B1VA magnetic field B2 with a vertical direction and generating a magnetic field BWMagnetic field B3 with vertical direction, magnetic flux phi of stator winding in second phase (namely stator winding BY)V＝N2*S2*(BV-B1 cosa1-B3 cosb1), wherein a1 is a magnetic field B1 and a magnetic field BVThe complement angle of the included angle between the two magnetic fields B1 and B3VThe supplementary angle of the included angle between the first phase stator winding and the second phase stator winding is N2, and S2 is the area of the closed coil of the second phase stator winding. Note that a1, b1, N2, and S2 are constant values in each three-phase asynchronous motor, and do not vary with the rotation of the rotor. Therefore, when the rotor is accelerated to rotate, B1 and B2 increase, causing the magnetic flux Φ of the second-phase stator winding to increaseVDecrease, according to Lenz's law, the blocking magnetic flux phi generated in the stator winding of the second phaseVThe direction of the reduced induced current I21 is consistent with the original current direction in the second phase stator winding (namely the magnetic field generated by the induced current I21 and the magnetic field B)VIn the same direction) so that the output current at the output end (i.e., the B port) of the second phase stator winding increases first. And when the rotor starts to rotate at a reduced speed, B1 and B2 decrease, causing the magnetic flux Φ of the second-phase stator winding to decreaseVIncrease, according to Lenz's law, the blocking magnetic flux phi generated in the stator winding of the second phaseVThe direction of the increased induced current I22 is opposite to the original current direction in the second phase stator winding (namely the magnetic field generated by the induced current I22 and the magnetic field B)VIn the opposite direction) so that the output current at the output of the second phase stator winding (i.e., the B port) begins to decrease. In summary, when the rotor rotates forward and the phase sequence of the three-phase stator winding is positive (in this embodiment, both the forward rotation and the positive sequence are clockwise), the output current of the external port of the second-phase stator winding increases first and then decreases. When the rotor rotates reversely and the phase sequence of the three-phase stator winding is reverse, the condition is the same as that when the rotor rotates positively and the phase sequence of the three-phase stator winding is positive, the rotor cuts the magnetic field along the directions of the first-phase stator winding, the second-phase stator winding and the third-phase stator winding, and the output current of the external port of the second-phase stator winding is increased firstlyAnd then decreases. Because the potential output by the external port of the second-phase stator winding changes along with the change of the output current, when the rotor rotates forwards, the phase sequence of the three-phase stator winding is positive, or the rotor rotates backwards, and the phase sequence of the three-phase stator winding is negative, the output potential of the external port of the second-phase stator winding is increased and then reduced.
When the rotor is rotated in the normal direction (i.e., clockwise), as shown in fig. 3, the magnetic flux Φ of the third-phase stator winding (i.e., stator winding CZ) according to the right-hand ruleW＝N3*S3*(BW+ B1 cosa2+ B2 cosb2), where a2 is a magnetic field B1 and a magnetic field BWB2 is the angle between the magnetic field B2 and the magnetic field BWThe included angle between the first phase winding and the second phase winding is N3, the number of the closed coil turns of the third phase stator winding is N3, and the area of the closed coil of the third phase stator winding is S3. Note that a2, b2, N3, and S3 are constant values in each three-phase asynchronous motor, and do not vary with the rotation of the rotor. Therefore, when the rotor is accelerated to rotate, B1 and B2 increase, causing the magnetic flux Φ of the second-phase stator winding to increaseWIncreasing, according to Lenz's law, the blocking magnetic flux phi generated in the stator winding of the third phaseWThe direction of the increased induced current I31 is opposite to the original current direction in the third phase stator winding (namely the magnetic field generated by the induced current I31 and the magnetic field B)VIn the opposite direction) the output current at the output of the stator winding of the third phase (i.e., the C-port) is first reduced. And when the rotor starts to rotate at a reduced speed, B1 and B2 decrease, causing the magnetic flux Φ of the stator winding of the third phase to decreaseWReducing the blocking magnetic flux phi generated in the third-phase stator winding according to Lenz's lawWThe reduced induced current I32 has the same direction as the original current in the third phase stator winding (i.e. the magnetic field generated by the induced current I32 and the magnetic field B)WIn the same direction) so that the output current at the output of the third phase stator winding (i.e., the C-port) begins to increase. In summary, when the rotor rotates forward and the phase sequence of the three-phase stator winding is positive (in this embodiment, both the forward rotation and the positive sequence are clockwise), the output current of the external port of the third-phase stator winding decreases first and then increases. When the rotor rotates reversely and the phase sequence of the three-phase stator winding is reverse, the condition is that the rotor rotates positively and the phase sequence of the three-phase stator winding is positiveIn the same sequence, the rotor cuts the magnetic field along the directions of the first-phase stator winding, the second-phase stator winding and the third-phase stator winding, and the output current of the external port of the third-phase stator winding is reduced and then increased. Because the potential output by the external port of the third-phase stator winding changes along with the change of the output current, when the rotor rotates forwards, the phase sequence of the three-phase stator winding is in a positive sequence, or the rotor rotates backwards, and the phase sequence of the three-phase stator winding is in a reverse sequence, the output potential of the external port of the third-phase stator winding is firstly reduced and then increased.
When the rotor is reversed (i.e., rotated counterclockwise), the rotor's cutting field frame 30 is at the cutting field B according to the right hand ruleU、BV、BWThe generated magnetic fields B11, B22, B33 (all of which are labeled in the drawings) are all opposite to the corresponding magnetic fields generated when the rotor rotates in the forward direction, for example: b11 is in the opposite direction to B1, B22 is in the opposite direction to B2, and B33 is in the opposite direction to B3. At this time, the magnetic flux Φ of the second-phase stator windingV1＝N2*S2*(BV+ B11 cosa11+ B33 cosb11), where a11 is a magnetic field B11 and a magnetic field BVB11 is the angle between the magnetic field B33 and the magnetic field BVThe angle between (a11 and b11 are both marked in the figure), and as the rotor accelerates and then decelerates, the magnetic flux ΦV1The output current at the output end (i.e. the port B) of the second-phase stator winding is increased after being increased.
Similarly, when the rotor is reversed (i.e., rotated counterclockwise), the magnetic flux Φ of the stator winding of the third phaseW1＝N3*S3*(BW-B11 cosa22-B22 cosb22), wherein a22 is a magnetic field B11 and a magnetic field BWThe complement angle of the included angle between the two magnetic fields B22 and B22WThe complement of the included angle between (a22 and b22 are both labeled in the figures). In the same way as above, as the rotor accelerates and then decelerates, the magnetic flux ΦW1The output current of the output end (namely, the port C) of the third-phase stator winding is increased after being decreased.
It should be noted that, if the three-phase asynchronous motor adopts the reverse order, it is only equivalent to interchange the second-phase stator winding and the third-phase stator winding in the above analysis, and other analysis principles are consistent with the above analysis, and are not described herein again.
Therefore, according to the above analysis, the phase sequence determination rule of the three-phase asynchronous motor can be as follows:
specifically, when the variation trend of the output current of the external connection end of the second-phase stator winding is detected.
The detection unit 2 is configured to determine that a phase sequence of the three-phase asynchronous motor is the same as a first direction (e.g., both the first direction and the second direction are clockwise) when the rotor of the three-phase asynchronous motor rotates in the first direction (e.g., forward rotation or reverse rotation) and the output current of the external terminal of the second-phase stator winding is detected to increase first and then decrease; when the rotor of the three-phase asynchronous motor rotates according to the first direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, the phase sequence of the three-phase asynchronous motor is judged to be opposite to the first direction.
The detection unit 2 is used for judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the second-phase stator winding is detected to be increased and then reduced; and when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
Further, the detection unit 2 may be a bidirectional pointer type milliampere meter or a digital multimeter, a negative electrode of the detection unit 2 is electrically connected to a negative electrode of the dc power supply 1, and a positive electrode of the detection unit 2 is electrically connected to an external terminal of the second-phase stator winding.
In this embodiment, the detection unit 2 employs a bidirectional pointer type milliampere meter or a digital multimeter to visually reflect the variation trend of the output current of the external terminal of the second-phase stator winding, and is cheap and easy to manufacture. In practical application, a bidirectional pointer type milliampere meter is preferred, and the change of a pointer is more intuitive than digital conversion.
Specifically, when the trend of change in the output potential of the circumscribed terminal of the second-phase stator winding is detected.
The detection unit 2 is used for judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction when the rotor of the three-phase asynchronous motor rotates in the first direction and detects that the output potential of the external end of the second-phase stator winding is increased and then decreased; when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
the detection unit 2 is used for judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and the output potential of the external end of the second-phase stator winding is detected to be increased and then decreased; and when the rotor of the three-phase asynchronous motor rotates according to a second direction and the output potential of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
Further, the detection unit 2 may include a test resistor and a voltmeter or a digital multimeter, one end of the test resistor is electrically connected to the dc power supply 1, and the other end of the test resistor is electrically connected to the external terminal of the second-phase stator winding, a negative electrode of the voltmeter or the digital multimeter is electrically connected to the negative electrode of the dc power supply 1, and a positive electrode thereof is electrically connected to the external terminal of the second-phase stator winding.
In this embodiment, the detecting unit 2 may include a testing resistor and a voltmeter or a digital multimeter, and the voltage on the testing resistor is detected by the voltmeter or the digital multimeter to determine the variation trend of the output potential of the external terminal of the second-phase stator winding, and the detecting unit 2 has a simple structure, is low in cost, and is convenient to prepare.
Specifically, when the variation trend of the output current of the external connection terminal of the third-phase stator winding is detected.
The detection unit 2 is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction when the rotor of the three-phase asynchronous motor rotates in the first direction and detects that the output current of the external end of the third-phase stator winding is increased and then reduced; when the rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
the detection unit 2 is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and detects that the output current of the external end of the third-phase stator winding is increased and then reduced; and when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the third-phase stator winding is detected to be reduced firstly and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
Further, the detection unit 2 may be a bidirectional pointer type milliampere meter or a digital multimeter, a negative electrode of the detection unit 2 is electrically connected to a negative electrode of the dc power supply 1, and a positive electrode of the detection unit 2 is electrically connected to an external terminal of the third phase.
In this embodiment, the detection unit 2 employs a bidirectional pointer type milliampere ammeter or a digital multimeter to visually reflect a variation trend of an output current of an external terminal of the third-phase stator winding, and is low in price and easy to manufacture.
Specifically, when the trend of change in the output potential of the external connection terminal of the third-phase stator winding is detected.
The detection unit 2 is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction when the rotor of the three-phase asynchronous motor rotates in the first direction and detects that the output potential of the external end of the third-phase stator winding is increased and then reduced; when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
the detection unit 2 is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and detects that the output potential of the external end of the third-phase stator winding is increased and then reduced; and when the rotor of the three-phase asynchronous motor rotates in a second direction and the output potential of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
Further, the detection unit 2 includes a test resistor and a voltmeter or a digital multimeter, one end of the test resistor is electrically connected to the dc power supply 1, and the other end of the test resistor is electrically connected to the external terminal of the third phase, and a negative electrode of the voltmeter or the digital multimeter is electrically connected to a negative electrode of the dc power supply 1, and a positive electrode of the voltmeter or the digital multimeter is electrically connected to the external terminal of the third phase.
In this embodiment, the detecting unit 2 may include a testing resistor and a voltmeter or a digital multimeter, and the voltage on the testing resistor is detected by the voltmeter or the digital multimeter to determine the variation trend of the output potential of the external terminal of the third-phase stator winding, and the detecting unit 2 has a simple structure, is low in cost, and is convenient to prepare.
After the phase sequence of the three-phase asynchronous motor is judged by the method, the three output cables of the three-phase alternating-current power supply are electrically connected with the external terminals of the first-phase stator winding, the second-phase stator winding and the third-phase stator winding of the three-phase asynchronous motor according to the judgment result. In this embodiment, see the following table:
Figure BDA0000985936240000151
optionally, referring to fig. 4, the apparatus further includes:
the device comprises a shell 3 provided with a binding post 31, a direct current power supply 1 (such as a 1.5V dry battery) and a detection unit 2 (such as a two-way pointer milliampere meter) are arranged in the shell 3, a display surface of the detection unit 2 is arranged on the surface of the shell, and a positive pole and a negative pole of the direct current power supply 1 and two input ports of the detection unit 2 are electrically connected with the corresponding binding posts.
And a cable (not marked in the drawing), wherein one end of the cable is provided with a plug matched with the binding post, and the other end of the cable is provided with an alligator clip.
And the power switch 5 is arranged on the surface of the shell 3 and is used for controlling the switching of the direct current power supply 1.
In this embodiment, the phase sequence testing device for the three-phase asynchronous motor of the nuclear power station can integrate the direct-current power supply 1 and the detection unit 2 in the shell 3, so that the device has a small structure and is convenient to carry and use. Terminals are provided on the housing 3, for example: just, the negative terminal, the ammeter, just, the negative terminal of power to supporting being provided with the cable, the one end of cable be equipped with terminal complex plug and the other end be equipped with the crocodile and press from both sides, when the test, the fast assembly of being convenient for, convenient test is used like this. A power switch 5 is added to facilitate the test operation. In addition, the device's simple structure, the component low price that adopts, the device's preparation low cost, and small in size, the assembly is convenient, does benefit to extensive using widely.
Optionally, referring to fig. 5, the apparatus may further include:
and the display unit 6 is electrically connected with the detection unit 2 and is used for directly displaying the detected phase sequence of the three-phase asynchronous motor.
In this embodiment, the phase sequence testing device for the three-phase asynchronous motor may further include a display unit 6 to directly display the phase sequence of the three-phase asynchronous motor, instead of the current or potential variation trend detected by the detection unit 2, so that the test result may be more conveniently observed.
It should be noted that the phase sequence testing device for the three-phase asynchronous motor of the present invention can be applied to any three-phase asynchronous motor adopting a star or delta connection mode, and can directly test the phase sequence of the three-phase asynchronous motor under the condition that the three-phase asynchronous motor is not connected and electrified, so as to obtain a correct cable connection mode between the three-phase asynchronous motor and a three-phase ac power supply, thereby ensuring that the three-phase asynchronous motor is correctly tested and rotated at one time.
The embodiment of the invention sets a direct-current power supply in a phase sequence testing device of a three-phase asynchronous motor, and the positive pole of the direct-current power supply is electrically connected with the external connection end of a first-phase stator winding of the three-phase asynchronous motor, and the negative pole of the direct-current power supply is respectively electrically connected with the external connection ends of a second-phase stator winding and a third-phase stator winding of the three-phase asynchronous motor, so as to generate a testing magnetic field in the stator windings of the three-phase asynchronous motor; the device is also provided with a detection unit used for measuring the change trend of the output current or the potential of the external end of the second-phase stator winding or the third-phase stator winding when the rotor of the three-phase asynchronous motor rotates in the test magnetic field and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule. The phase sequence testing device for the three-phase asynchronous motor has the advantages of simple structure, low manufacturing price and high economy, and can be prepared in a large scale, so that the cost is saved; and the device can directly test the phase sequence of the three-phase asynchronous motor under the condition that the three-phase asynchronous motor is not connected with a three-phase alternating current power supply and is not electrified, the condition that the three-phase asynchronous motor damages the motor due to starting reversal can not occur, and the device is simple and convenient in test operation, accurate and efficient in test result and has strong practicability.
Example two
The embodiment of the invention provides a phase sequence testing method for a three-phase asynchronous motor of a nuclear power station, which is suitable for a device described in the first embodiment and shown in a figure 6, and the method comprises the following steps:
and step S21, electrically connecting the external connection end of the first phase stator winding of the three-phase asynchronous motor to be tested with the positive electrode of the direct-current power supply, and electrically connecting the external connection ends of the second phase stator winding and the third phase stator winding of the three-phase asynchronous motor with the negative electrode of the direct-current power supply.
In this embodiment, the external connection end of the first phase stator winding of the three-phase asynchronous motor to be tested is electrically connected with the positive electrode of the direct-current power supply, and the external connection ends of the second phase stator winding and the third phase stator winding of the three-phase asynchronous motor are both electrically connected with the negative electrode of the direct-current power supply, so that the stator winding of the three-phase asynchronous motor can generate a test magnetic field, and when the rotor rotates in the test magnetic field, the variation trend of the output current or the potential of the external connection end of the second phase stator winding or the third phase stator winding is observed, so as to judge the phase sequence of the three-phase asynchronous motor.
It should be noted that the three-phase asynchronous motor generally has three-phase stator windings, and the "first-phase stator winding, second-phase stator winding, and third-phase stator winding" in this embodiment is used to distinguish the phase stator windings, and is not used to describe a specific order or a sequence order, that is, the first-phase stator winding, the second-phase stator winding, and the third-phase stator winding may all refer to any one of the three-phase stator windings, and this is not limited here.
And step S22, rotating the rotor of the three-phase asynchronous motor.
In this embodiment, the rotation direction of the rotor can be rotated according to the required steering of the three-phase asynchronous motor.
And step S23, detecting the variation trend of the output current or the potential of the external terminal of the second-phase stator winding or the third-phase stator winding, and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule.
In the present embodiment, the principle of determining the phase sequence of the three-phase asynchronous motor according to the preset phase sequence determination rule is set forth in embodiment one and will not be described here.
In this embodiment, the step S23 can be implemented by the following four cases:
specifically, the step S23 of determining the phase sequence of the three-phase asynchronous motor according to the preset phase sequence determination rule may be implemented as follows:
when the rotor of the three-phase asynchronous motor rotates according to a first direction (for example, forward rotation or reverse rotation), and the output current of the external end of the second-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction (for example, the three-phase asynchronous motor and the stator winding are both clockwise);
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the second-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction;
and when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
Further, the detecting of the variation trend of the output current of the external terminal of the second-phase stator winding in step S23 may be implemented as follows:
and a bidirectional pointer type milliampere ammeter or a digital multimeter is adopted to detect the change trend of the output current of the external terminal of the second-phase stator winding.
Specifically, the step S23 of determining the phase sequence of the three-phase asynchronous motor according to the preset phase sequence determination rule may be implemented as follows:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the second-phase stator winding is detected to increase and then decrease, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output potential of the external end of the second-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction;
and when the rotor of the three-phase asynchronous motor rotates according to a second direction and the output potential of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction.
Further, the detection of the trend of the output potential of the external connection terminal of the second-phase stator winding in step S23 may be implemented as follows:
and measuring the voltage variation trend on a test resistor connected in series with the external connection end of the second-phase stator winding by using a voltmeter or a digital multimeter.
Specifically, the step S23 of determining the phase sequence of the three-phase asynchronous motor according to the preset phase sequence determination rule may be implemented as follows:
when a rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the third-phase stator winding is detected to increase and then decrease, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the third-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction;
and when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the third-phase stator winding is detected to be reduced firstly and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
Further, the detecting of the variation trend of the output current of the external terminal of the third-phase stator winding in step S23 may be implemented as follows:
and a bidirectional pointer type milliampere ammeter or a digital multimeter is adopted to detect the change trend of the output current of the external terminal of the third-phase stator winding.
Specifically, the step S23 of determining the phase sequence of the three-phase asynchronous motor according to the preset phase sequence determination rule may be implemented as follows:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the third-phase stator winding is detected to increase and then decrease, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output potential of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output potential of the external end of the third-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction;
and when the rotor of the three-phase asynchronous motor rotates in a second direction and the output potential of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction.
Further, the detection of the trend of the output potential of the external connection terminal of the third-phase stator winding in step S23 may be implemented as follows:
and measuring the voltage variation trend on a test resistor connected in series with the external connection end of the third phase stator winding by using a voltmeter or a digital multimeter.
The external connection end of a first phase stator winding of a three-phase asynchronous motor to be tested is electrically connected with a positive pole of a direct-current power supply, and the external connection ends of a second phase stator winding and a third phase stator winding of the three-phase asynchronous motor are electrically connected with a negative pole of the direct-current power supply; then the rotor of the three-phase asynchronous motor is rotated; and finally, detecting the change trend of the output current or potential of the external end of the second-phase stator winding or the third-phase stator winding, and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule. The phase sequence testing method of the three-phase asynchronous motor is simple and accurate, and can directly test the phase sequence of the three-phase asynchronous motor under the condition that the three-phase asynchronous motor is not connected with a three-phase alternating current power supply and is not electrified.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (2)

1. A phase sequence testing device for a three-phase asynchronous motor of a nuclear power station is characterized by comprising:
the testing device comprises a direct current power supply (1), wherein the positive electrode of the direct current power supply (1) is electrically connected with the external connection end of a first-phase stator winding of the three-phase asynchronous motor, the negative electrode of the direct current power supply (1) is respectively electrically connected with the external connection ends of a second-phase stator winding and a third-phase stator winding of the three-phase asynchronous motor and used for generating a testing magnetic field for the three-phase asynchronous motor, and the external connection end is a port for connecting the stator winding with an external circuit;
the detection unit (2) is electrically connected with the external connection end of the second-phase stator winding or the third-phase stator winding of the three-phase asynchronous motor, and is used for measuring the change trend of the output current of the external connection end of the second-phase stator winding or the third-phase stator winding when the rotor of the three-phase asynchronous motor rotates in the test magnetic field and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule;
the detection unit (2) is used for judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the second-phase stator winding is detected to increase and then decrease; when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
the detection unit (2) is used for judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the second-phase stator winding is detected to increase and then decrease; when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction;
alternatively, the first and second electrodes may be,
the detection unit (2) is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the third-phase stator winding is detected to be increased and then decreased; when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
the detection unit (2) is used for judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the third-phase stator winding is detected to be increased and then decreased; when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the third-phase stator winding is detected to be reduced firstly and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction;
the detection unit (2) is a bidirectional pointer type milliampere meter, the negative electrode of the bidirectional pointer type milliampere meter is electrically connected with the negative electrode of the direct current power supply (1), and the positive electrode of the bidirectional pointer type milliampere meter is electrically connected with the external connection end of the second-phase stator winding or the external connection end of the third-phase stator winding;
the device further comprises: the direct current power supply comprises a shell (3) provided with binding posts (31), the direct current power supply (1) and the two-way pointer type milliampere meter are both arranged in the shell (3), a display surface of the two-way pointer type milliampere meter is arranged on the surface of the shell (3), and a positive electrode and a negative electrode of the direct current power supply (1) and two input ports of the two-way pointer type milliampere meter are both electrically connected with the corresponding binding posts;
a plug matched with the binding post is arranged at one end of the cable, an alligator clip is arranged at the other end of the cable,
the power switch (5) is arranged on the surface of the shell (3) and is used for controlling the switch of the direct current power supply (1);
and the display unit (6) is electrically connected with the bidirectional pointer type milliampere ammeter and is used for displaying the detected phase sequence of the three-phase asynchronous motor.
2. A method for testing the phase sequence of a three-phase asynchronous motor in a nuclear power plant by using the device as claimed in claim 1, wherein the method comprises the following steps:
the method comprises the steps that an external connection end of a first-phase stator winding of a three-phase asynchronous motor to be tested is electrically connected with a positive pole of a direct-current power supply, and external connection ends of a second-phase stator winding and a third-phase stator winding of the three-phase asynchronous motor are both electrically connected with a negative pole of the direct-current power supply;
rotating a rotor of the three-phase asynchronous motor;
detecting the change trend of the output current of the external terminal of the second-phase stator winding or the third-phase stator winding, and judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule;
the method for judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule comprises the following steps:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the second-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the second-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction;
when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the second-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction, and the second direction is opposite to the first direction;
alternatively, the first and second electrodes may be,
the method for judging the phase sequence of the three-phase asynchronous motor according to a preset phase sequence judgment rule comprises the following steps:
when the rotor of the three-phase asynchronous motor rotates in a first direction and the output current of the external end of the third-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the first direction;
when the rotor of the three-phase asynchronous motor rotates in the first direction and the output current of the external end of the third-phase stator winding is detected to be reduced and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the first direction;
when the rotor of the three-phase asynchronous motor rotates in a second direction and the output current of the external end of the third-phase stator winding is detected to be increased and then decreased, judging that the phase sequence of the three-phase asynchronous motor is opposite to the second direction;
when the rotor of the three-phase asynchronous motor rotates in the second direction and the output current of the external end of the third-phase stator winding is detected to be reduced firstly and then increased, judging that the phase sequence of the three-phase asynchronous motor is the same as the second direction, and the second direction is opposite to the first direction;
the detecting a variation trend of an output current of an external terminal of the second-phase stator winding includes:
detecting the change trend of the output current of the external terminal of the second-phase stator winding by adopting a bidirectional pointer type milliampere ammeter; or, a bidirectional pointer type milliampere ammeter is adopted to detect the change trend of the output current of the external terminal of the third-phase stator winding.
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