CN110398659B - Method for rapidly detecting and judging line breakage position of synchronous main generator - Google Patents
Method for rapidly detecting and judging line breakage position of synchronous main generator Download PDFInfo
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- CN110398659B CN110398659B CN201910692238.8A CN201910692238A CN110398659B CN 110398659 B CN110398659 B CN 110398659B CN 201910692238 A CN201910692238 A CN 201910692238A CN 110398659 B CN110398659 B CN 110398659B
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Abstract
The invention relates to the technical field of locomotive synchronous main generator maintenance, and discloses a method for quickly detecting and judging the disconnection position of a synchronous main generator, which comprises the following steps of firstly, testing the phase resistance of each phase of a stator U, V, W of the synchronous main generator by using a direct current resistance tester, and judging which phase has a disconnection; step two, electrifying in a broken line phase; measuring the current value of each coil in the broken wire phase or the current value between the broken wire phase and the N phase, and judging whether the coil is broken or not; and fourthly, disassembling the welding points at the two ends of the coil which is judged to be broken, and performing external insulation and judgment. The invention has the following advantages and effects: by the method, the labor intensity is reduced, the maintenance time of the synchronous main generator is effectively shortened, and the efficiency of searching the broken line position of each phase coil of the stator of the synchronous main generator can be greatly improved.
Description
Technical Field
The invention relates to the technical field of locomotive synchronous main generator maintenance, in particular to a method for quickly detecting and judging the line breakage position of a synchronous main generator.
Background
The synchronous main generator is an important device on a locomotive, the stator of the synchronous main generator comprises U, V, W, N four collector rings, also called phases, coils are respectively welded on the four collector rings, one end of each coil is welded with the N phase, and the other end of each coil is contained on one of the phases U, V, W. In the running process of the locomotive, due to the vibration of the diesel engine, the welding point between the coil and the collecting ring is in virtual connection or even is broken, and great potential safety hazards are caused to the running of the synchronous main generator and the train.
In the actual maintenance process, U, V, W each phase direct current resistance is tested respectively through the direct current resistance tester at present, judge whether there is the broken string through each phase direct current resistance deviation. The existing method for finding the broken wire position between the coil and the collecting ring is to find the broken wire position by disassembling the insulation outside the connector lug one by one and visually observing the welding state, the time for finding the broken wire position is basically 6-8 hours, the overhauling process is time-consuming and labor-consuming, and in the process of disassembling the insulation outside, the intact welding spot is easily damaged.
Disclosure of Invention
The invention aims to provide a method for quickly detecting and judging the line breaking position of a synchronous main generator, which has the effect of quickly detecting and judging the line breaking position of the synchronous main generator.
The technical purpose of the invention is realized by the following technical scheme: a method for rapidly detecting and judging the line breaking position of a synchronous main generator comprises the following steps that firstly, a direct current resistance tester is used for testing the phase resistance of each phase of a stator U, V, W of the synchronous main generator, and the line breaking is judged in which phase; step two, electrifying in a broken line phase; measuring the current value of each coil in the broken wire phase or the current value between the broken wire phase and the N phase, and judging whether the coil is broken according to the measured current value; and fourthly, disassembling the welding points at the two ends of the coil which is judged to be broken, and performing external insulation and judgment.
By adopting the technical scheme, the direct-current resistance tester is used for testing the phase resistance of the three phases of the synchronous main generator stator U, V, W, and the phase of which the line is broken is judged according to the direct-current resistance deviation of each phase. And electrifying in the broken wire phase, measuring the current value of each coil or between the broken wire phase and the N phase, judging whether the coil is broken according to the measured current value, disassembling the outer coating insulation of the welding points at two ends of the coil which is judged to be broken, and judging by visual inspection to confirm again.
The invention is further provided with: in the first step, the phase resistance difference of each phase exceeds 0.5%, and at least one phase with a large resistance value is judged to be broken.
The invention is further provided with: and in the second step, the direct current is communicated with the N phase at the broken line phase by using a direct current power supply.
The invention is further provided with: in the second step, the current of the introduced direct current is 100A.
The invention is further provided with: and step three, detecting the current value of each coil in the wire break phase one by using a pincerlike meter, and if the current of the coil is 0 or less than the average current of the coil, judging that the coil is wire break.
The invention is further provided with: the system comprises a rapid detection system capable of conducting electricity and detecting broken lines, wherein the rapid detection system comprises an alternating current power supply, a plurality of annular iron cores capable of being opened and closed, primary coils wound on the iron cores, contactors corresponding to the primary coils, a controller module connected with the contactors, and an ammeter used for detecting current between the broken line phase and the N phase; step two, when the current is introduced into the open-circuit phase by using the rapid detection system, the plurality of iron cores are respectively buckled on the coils of the open-circuit phase one by one, and the controller module controls the primary coils of the plurality of iron cores to be independently electrified one by one; in the third step, the ammeter measures the current between the open-circuit phase and the N phase when the primary coils of the plurality of iron cores are electrified one by one, transmits a current value signal to the controller module, and judges that the coil corresponding to the primary coil is open-circuit when the measured current value is 0 or lower than the average value.
The invention is further provided with: the system comprises a rapid detection system capable of conducting electricity and detecting broken lines, wherein the rapid detection system comprises an alternating current power supply, a plurality of annular iron cores capable of being opened and closed, primary coils wound on the iron cores, contactors corresponding to the primary coils, a controller module connected with the contactors, and an ammeter used for detecting current between the broken line phase and the N phase; in the second step, when alternating current is input to one phase of the broken line by using the rapid detection system, the plurality of iron cores are respectively buckled on coils of the broken line phase, and the controller module controls the primary coil to be electrified through the contactor; in the third step, the controller module randomly equally divides primary coils of a plurality of iron cores into a first coil group and a second coil group, respectively measures a first current value of an ammeter when the first coil group is electrified and a second current value of the ammeter when the second coil group is electrified, compares the first current value and the second current value, determines the coil group corresponding to the smaller current value as a first-stage broken coil group, then randomly equally divides the primary coils in the first-stage broken coil group into a third coil group and a fourth coil group, respectively measures a third current value of the ammeter when the third coil group is electrified and a fourth current value of the ammeter when the fourth coil group is electrified, compares the third current value and the fourth current value, determines the coil group corresponding to the smaller current value as a second-stage broken coil group, repeats the operation until the primary coil with the smallest or 0 current value is found, and determines the coil corresponding to the primary coil as broken; repeating the operation of the third step for 2-6 times to find a plurality of coils which are judged to be broken.
By adopting the technical scheme, the iron core is annular, the iron core is buckled on the coil on the stator of the synchronous main generator after being opened, the controller module controls the primary coil to be electrified, and the coil of the stator of the synchronous main generator generates induced current. The controller module randomly equally divides the primary coils of the plurality of iron cores into two groups, respectively measures the current corresponding to the two coil groups when the two coil groups are electrified, the synchronous main generator stator coil corresponding to the coil group with small current value has broken wire, the operation is repeated until the primary coil with the minimum current value or 0 is found, and the coil corresponding to the primary coil is judged to be broken wire.
The invention is further provided with: the iron core comprises a first core body, a second core body and a spring, wherein the second core body is hinged with the first core body, and the spring is used for driving the first core body to be in contact with the second core body to form a closed loop.
The invention is further provided with: the primary coils of the plurality of iron cores are arranged in parallel.
The invention is further provided with: the ammeter is connected with the controller module and used for transmitting the measured current value signal to the controller module.
The invention has the beneficial effects that: the invention adopts a direct current resistance tester to test the phase resistance of each phase, judges which phase has broken wire, measures the current of each coil through a pincerlike meter after the phase is electrified, if the current is 0 or less than the average value, judges the coil broken wire, then disassembles the welding points at the two ends of the coil which is judged to be broken wire and carries out insulation coating, and then judges.
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 flow chart of the present invention.
FIG. 2 is a schematic diagram of the rapid detection system of the present invention.
Fig. 3 is a schematic view of the core structure of the present invention.
In the figure, 1, an alternating current power supply; 2. a contactor; 3. an iron core; 31. a first core body; 32. a second core body; 33. a spring; 4. a primary coil; 5. a controller module.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1: a method for quickly detecting and judging the line breaking position of a synchronous main generator comprises the following steps of firstly, testing the phase resistance of each phase of a stator U, V, W of the synchronous main generator by using a direct-current resistance tester, and judging which phase has a line breaking. If the phase resistance difference of each phase exceeds 0.5%, at least one broken line in one phase with large resistance value is judged.
And step two, a direct current is communicated with the N through a direct current power supply at the wire-broken phase, and the current of the direct current is 100A.
And step three, detecting the current value of each coil in the wire break phase one by using a pincerlike meter, and if the current of the coil is 0 or less than the average current of the coil, judging that the coil is wire break.
And fourthly, disassembling the welding points at the two ends of the coil which is judged to be broken, and performing external insulation and judgment.
Example 2: a method for quickly detecting and judging the line breaking position of a synchronous main generator comprises the following steps of firstly, testing the phase resistance of each phase of a stator U, V, W of the synchronous main generator by using a direct-current resistance tester, and judging which phase has a line breaking. If the phase resistance difference of each phase exceeds 0.5%, at least one broken line in one phase with large resistance value is judged.
And step two, the system comprises a rapid detection system capable of conducting electricity and detecting the broken line, as shown in fig. 2 and fig. 3, the rapid detection system comprises an alternating current power supply, a plurality of annular iron cores capable of being opened and closed, a primary coil wound on the iron cores, a contactor corresponding to the primary coil, a controller module connected with the contactor, and an ammeter used for measuring the current between the broken line phase and the N phase, wherein the iron core comprises a core body I, a core body II hinged with the core body I, and a spring used for driving the core body I and the core body II to form a closed loop after being contacted. The primary coils of the iron cores are arranged in parallel, the controller module is a single chip microcomputer, the alternating current power supply supplies power to the primary coils, the contactor is used for controlling the power-on or power-off of the primary coils, and the ammeter is connected with the controller module and used for transmitting measured current numerical value signals to the controller module.
The plurality of iron cores are respectively buckled on each coil of the open-circuit phase in a one-to-one correspondence mode, the controller module controls primary coils of the plurality of iron cores to be electrified independently one by one, namely the contactor controls the first primary coil to be electrified for a period of time through the contactor, and then the contactor controls the first primary coil to be powered off. And then the controller module controls the second primary coil to be electrified for a period of time through the contactor, and then the contactor controls the second primary coil to be powered off, and so on.
And step three, the ammeter measures the current between the open-circuit phase and the N phase when the primary coils of the plurality of iron cores are electrified independently one by one, transmits a current value signal to the controller module, and judges that the coil corresponding to the primary coil is open-circuit when the measured current value is 0 or lower than the average value.
And fourthly, disassembling the welding points at the two ends of the coil which is judged to be broken, and performing external insulation and judgment.
Example 3: a method for quickly detecting and judging the line breaking position of a synchronous main generator comprises the following steps of firstly, testing the phase resistance of each phase of a stator U, V, W of the synchronous main generator by using a direct-current resistance tester, and judging which phase has a line breaking. If the phase resistance difference of each phase exceeds 0.5%, at least one broken line in one phase with large resistance value is judged.
And step two, the rapid detection system capable of conducting electricity and detecting the broken line is included, as shown in fig. 2 and fig. 3, the rapid detection system comprises an alternating current power supply 1, a plurality of annular iron cores 3 capable of being opened and closed, a primary coil 4 wound on the iron cores 3, a contactor 2 corresponding to the primary coil 4, a controller module 5 connected with the contactor 2, and an ammeter used for measuring the current between the broken line phase and the N phase, wherein the iron core 3 comprises a core body I31, a core body II 32 hinged with the core body I31, and a spring 33 used for driving the core body I31 and the core body II 32 to form a closed loop after being contacted. The primary coils 4 of the iron cores are arranged in parallel, the controller module 5 is a single chip microcomputer, the alternating current power supply 1 supplies power to the primary coils 4, the contactor 2 is used for controlling the power-on or power-off of the primary coils 4, and the ammeter is connected with the controller module 5 and used for transmitting measured current numerical value signals to the controller module 5.
When alternating current is input into the open circuit phase by using the rapid detection system, the plurality of iron cores 3 are respectively buckled on each coil of the open circuit phase one by one, and the controller module 5 controls the primary coil 4 to be electrified through the contactor 2.
In the third step, the controller module 5 randomly equally divides the primary coils 4 of the plurality of iron cores into a first coil group and a second coil group, respectively measures a first current value of the ammeter when the first coil group is powered on and a second current value of the ammeter when the second coil group is powered on, compares the first current value with the second current value, determines that the coil group corresponding to the smaller current value is a first-stage broken coil group, then randomly equally divides the primary coils 4 in the first-stage broken coil group into a third coil group and a fourth coil group, respectively measures a third current value of the ammeter when the third coil group is powered on and a fourth current value of the ammeter when the fourth coil group is powered on, compares the third current value with the fourth current value, determines that the coil group corresponding to the smaller current value is a second-stage broken coil group, repeats the above operations until the primary coil 4 with the smallest or 0 current value is found, and determines that the coil corresponding to the primary coil 4 is broken; repeating the operation of the third step for 2-6 times to find a plurality of coils which are judged to be broken.
Claims (5)
1. A method for rapidly detecting and judging the line breakage position of a synchronous main generator is characterized by comprising the following steps: comprises the following steps
Step one, testing the phase resistance of each phase of the synchronous main generator stator U, V, W by using a direct current resistance tester, and judging which phase has a broken line;
secondly, alternating current is conducted in the broken line phase;
measuring the current value between the broken wire phase and the N phase, and judging whether the coil is broken according to the measured current value;
fourthly, disassembling welding points at two ends of the coil which is judged to be broken, and externally wrapping the welding points for insulation, and judging;
the method uses a rapid detection system which can communicate and detect the broken line, the rapid detection system comprises an alternating current power supply, a plurality of annular iron cores which can be opened and closed, primary coils wound on the iron cores, contactors corresponding to the primary coils, a controller module connected with the contactors, and an ammeter used for detecting the current between the broken line phase and the N phase, the alternating current power supply supplies power to the primary coils, and the contactors are used for controlling the energization or the power failure of the primary coils; step two, when the current is introduced into the broken line phase by using the rapid detection system, the plurality of iron cores are respectively buckled on the coils of the broken line phase one by one, the controller module controls the primary coils of the plurality of iron cores to be independently electrified one by one through the contactor, and the primary coils of the plurality of iron cores are arranged in parallel; in the third step, the ammeter measures the current between the open-circuit phase and the N phase when the primary coils of the plurality of iron cores are electrified one by one, transmits a current value signal to the controller module, and judges that the coil corresponding to the primary coil is open-circuit when the measured current value is 0 or lower than the average value.
2. The method for rapidly detecting and judging the line breakage position of the synchronous main generator according to claim 1, characterized in that: in the first step, if the phase resistance difference of each phase exceeds 0.5%, at least one broken line in one phase with a large resistance value is judged.
3. The method for rapidly detecting and judging the line breakage position of the synchronous main generator according to claim 1, characterized in that: in the third step, the controller module randomly equally divides primary coils of a plurality of iron cores into a first coil group and a second coil group, respectively measures a first current value of an ammeter when the first coil group is electrified and a second current value of the ammeter when the second coil group is electrified, compares the first current value and the second current value, determines the coil group corresponding to the smaller current value as a first-stage broken coil group, then randomly equally divides the primary coils in the first-stage broken coil group into a third coil group and a fourth coil group, respectively measures a third current value of the ammeter when the third coil group is electrified and a fourth current value of the ammeter when the fourth coil group is electrified, compares the third current value and the fourth current value, determines the coil group corresponding to the smaller current value as a second-stage broken coil group, repeats the operation until the primary coil with the smallest or 0 current value is found, and determines the coil corresponding to the primary coil as broken; repeating the operation of the third step for 2-6 times to find a plurality of coils which are judged to be broken.
4. The method for rapidly detecting and judging the line breakage position of the synchronous main generator according to claim 1 or 3, characterized in that: the iron core comprises a first core body, a second core body and a spring, wherein the second core body is hinged with the first core body, and the spring is used for driving the first core body to be in contact with the second core body to form a closed loop.
5. The method for rapidly detecting and judging the line breakage position of the synchronous main generator according to claim 1 or 3, characterized in that: the ammeter is connected with the controller module and used for transmitting the measured current value signal to the controller module.
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