CN111983323B - Method and device for measuring resistance of generator sealing tile by induced voltage method - Google Patents
Method and device for measuring resistance of generator sealing tile by induced voltage method Download PDFInfo
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- CN111983323B CN111983323B CN202010632055.XA CN202010632055A CN111983323B CN 111983323 B CN111983323 B CN 111983323B CN 202010632055 A CN202010632055 A CN 202010632055A CN 111983323 B CN111983323 B CN 111983323B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention relates to a method and a device for measuring the resistance of a generator sealing tile by an induced voltage method, wherein the method is applied to a generator sealing tile measuring device without disassembly of a wheel, and the generator sealing tile measuring device comprises the following components: the device comprises measuring equipment, a voltage generating device, an alternating current source and a current collecting device; the method comprises the following steps: starting an alternating current source; after the AC source is started, outputting an AC signal to the voltage generating device; the voltage generating device generates an alternating signal according to the alternating signal and transmits the alternating signal into a large shaft of the generator rotor; after the alternating signal is transmitted into a large shaft of the generator rotor, a second voltage value is obtained; the second voltage value is the voltage value on the second sealing tile; after alternating signals are transmitted into a large shaft of a generator rotor, input current is obtained; and obtaining the resistance value of the generator sealing tile according to the input current and the second voltage value. The invention directly measures the resistance of the generator sealing tile by utilizing the induced voltage mode, does not need to disassemble the counter wheel, and can obviously shorten the maintenance time and has low cost.
Description
Technical Field
The invention relates to the field of automobile repair, in particular to a method and a device for measuring the resistance of a generator sealing tile by an induced voltage method.
Background
In the overhaul of the steam turbine, the insulation of the excitation side sealing bush of the generator must be measured, and taking fig. 1 as an example, the 7 # sealing bush and the 8 # sealing bush of the generator are made of epoxy resin insulation materials specially manufactured by manufacturers to the ground, so that the insulation to the ground is maintained, and the circular current caused by failure in the operation is avoided from burning out the bearing bush. The No. 1-6 watt is not specially insulated to the ground, oil insulation is used in operation, and the No. 1-6 watt is grounded because the bearing bush oil is completely stopped in overhaul.
Therefore, the insulation of the sealing bush 7 and the sealing bush 8 to the ground is difficult to measure, and the wheel alignment between the sealing bush 7 and the steam turbine must be disconnected during measurement, otherwise, the large shaft of the generator rotor is connected with the large shaft of the steam turbine through the wheel alignment, and the insulation is zero. However, the separation of the turbine and the generator is a work with a great workload, 4 people are required to work for more than 20 hours, after the separation of the turbine, one of the two rotors is pushed away along the axial direction, after the insulation measurement is completed, the two rotors are pushed back again, after reconnection, the turbine and the generator are easily caused to be not concentric, and the re-centering takes a plurality of days, so that the maintenance progress and the efficiency are greatly reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for measuring the resistance of a sealing tile of a generator by an induced voltage method aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows: a method of constructing an induced voltage method for measuring the resistance of a generator seal shoe, the method being applied to a generator seal shoe measuring device that does not disassemble a wheel, the generator seal shoe measuring device comprising: the device comprises measuring equipment, a voltage generating device, an alternating current source and a current collecting device; the method comprises the following steps:
starting the alternating current source;
after the alternating current source is started, an alternating current signal is output to the voltage generating device;
the voltage generating device generates an alternating signal according to the alternating signal and transmits the alternating signal into a large shaft of a generator rotor;
after the alternating signal is transmitted into the large shaft of the generator rotor, a second voltage value is obtained; the second voltage value is the voltage value on the second sealing tile;
after the alternating signal is transmitted into the large shaft of the generator rotor, obtaining input current;
and obtaining the resistance value of the generator sealing tile according to the input current and the second voltage value.
Preferably, after the alternating signal is transmitted into the large shaft of the generator rotor, obtaining the second voltage value includes:
and after the alternating signal is transmitted into the large shaft of the generator rotor, measuring the voltage at two ends of the second sealing tile through the measuring equipment to obtain the second voltage value.
Preferably, said obtaining an input current after said alternating signal is transmitted into said generator rotor large shaft comprises:
after the alternating signal is transmitted into the large rotor shaft of the generator, collecting current on the large rotor shaft through the current collecting device;
and measuring the current acquired by the current acquisition device through the measurement equipment to obtain the input current.
Preferably, the obtaining the resistance value of the generator sealing tile according to the input current and the second voltage value includes:
the second voltage value and the input current are taken as a quotient, and the quotient of the second voltage value and the input current is obtained; and the quotient of the second voltage value and the input current is the sealing resistance value of the generator.
Preferably, the current collection device includes: annular CT;
the annular CT is sleeved on the large shaft of the generator rotor and is arranged close to the first sealing tile.
Preferably, the voltage generating means includes: a multi-turn excitation coil;
the multi-turn exciting coil is sleeved on the large shaft of the generator rotor and is arranged close to the first sealing tile.
Preferably, the resistance value of the generator sealing tile is the parallel connection value of the first sealing tile and the second sealing tile.
Preferably, the method further comprises:
and judging the insulation effect of the generator sealing tile according to the resistance value of the generator sealing tile.
The invention also provides a device for measuring the resistance of the generator sealing tile by an induced voltage method, which comprises a generator sealing tile measuring device without disassembly of the wheel and a control unit, wherein the generator sealing tile measuring device comprises: the device comprises measuring equipment, a voltage generating device, an alternating current source and a current collecting device;
the alternating current source is used for providing alternating current signals for the voltage generating device after the alternating current source is started;
the voltage generating device is used for generating an alternating signal according to the alternating signal and transmitting the alternating signal into a large shaft of a generator rotor;
the current acquisition device is used for acquiring current on a large shaft of the generator rotor;
the measuring equipment is used for measuring the current acquired by the current acquisition device and the voltage value on the second sealing tile so as to obtain a second voltage value and an input current;
and the control unit is used for obtaining the resistance value of the generator sealing tile according to the input current and the second voltage value.
Preferably, the current collection device includes: annular CT;
the annular CT is sleeved on the large shaft of the generator rotor and is arranged close to the first sealing tile.
Preferably, the voltage generating means includes: a multi-turn excitation coil;
the multi-turn exciting coil is sleeved on the large shaft of the generator rotor and is arranged close to the first sealing tile.
Preferably, the resistance value of the generator sealing tile is the parallel connection value of the first sealing tile and the second sealing tile.
The method for measuring the resistance of the generator sealing tile by using the induced voltage method has the following beneficial effects: according to the invention, the resistance of the sealing tile of the generator can be directly measured by utilizing the induction voltage according to the method without disassembling the turbine pairing wheel, the insulation effect of the sealing tile is directly judged by utilizing the measured resistance, the testing method is simple and high in efficiency, the measurement is accurate, the maintenance time is effectively shortened, the maintenance difficulty is further reduced, and the cost is effectively reduced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of the overall insulation and grounding of a turbine and generator shaft system;
FIG. 2 is a circuit diagram of an apparatus for measuring the resistance of a sealing shoe of a generator by an induced voltage method according to an embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram of a device for measuring the resistance of a generator sealing tile by an induced voltage method according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for measuring a resistance value of a sealing tile of a generator by an induced voltage method according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
In order to solve the problems of measuring the sealing tile No. 7 and the sealing insulating tile No. 8 during the overhaul of the steam turbine, the invention provides an induced voltage method for measuring. In the measuring process, the method does not need to disassemble the paired wheels, can greatly reduce the measuring difficulty, has the advantages of simple measuring method, obviously improved measuring efficiency and high measuring precision, effectively shortens the measuring time, further quickens the maintenance progress, and simultaneously can reduce the cost.
Specifically, the method for measuring the resistance value of the sealing tile of the generator by using the induced voltage method provided by the embodiment of the invention can be realized by using the device for measuring the sealing tile of the generator without disassembling the wheel disclosed by the embodiment of the invention. As shown in fig. 2, the generator sealing tile measuring device includes: a measuring device 101, a voltage generating means 102, an alternating current source 103 and a current collecting means 104. Further, the generator sealing tiles to be measured in the embodiment of the present invention are the sealing tile No. 7 200 and the sealing tile No. 8 201 in fig. 1 to 3.
In some embodiments, the ac source 103 is configured to provide an ac signal to the voltage generating device 102 after activation. Alternatively, the ac source 103 includes, but is not limited to, a movable ac source 103. The output voltage of the ac source 103 may be selectively determined according to the measurement requirement of the present invention, which is not particularly limited. Further, as shown in fig. 2 and 3, the output terminal of the ac source 103 is connected to the input terminal of the voltage generating device 102, and outputs an ac signal to the input terminal of the voltage generating device 102 after the start-up.
In some embodiments, the voltage generating device 102 is configured to generate an alternating signal based on the alternating signal and transmit the alternating signal into the large shaft 203 of the generator rotor 202. As shown in fig. 2, the input terminal of the voltage generating device 102 is connected to an ac source 103, and receives an ac signal provided by the ac source 103. In some embodiments, the voltage generating device 102 includes: a multi-turn excitation coil. Wherein the multi-turn excitation coil is sleeved on the large shaft 203 of the generator rotor 202 and is arranged close to the first sealing tile. In the embodiment of the present invention, the first sealing tile is a sealing tile No. 7 200 (as shown in fig. 2). Specifically, after the ac signal output by the ac source 103 is introduced into the voltage generating device 102, the magnetic flux in the large shaft 203 of the generator rotor 202 where the voltage generating device 102 is located begins to alternate, and in the large shaft 203 of the same section of rotor 202, an induced electromotive force is generated, and the generated induced electromotive force is transferred to the large shaft 203 of the sealing tile No. 7 200 and the sealing tile No. 8 201, so that the sealing tile No. 7 200 and the sealing tile No. 8 can form a parallel voltage signal.
In some embodiments, the current collection device 104 is used to collect current on the large shaft 203 of the generator rotor 202. Specifically, when the magnetic flux in the large shaft 203 of the rotor 202 in the coil starts to alternate, an induced electromotive force is generated and transmitted to the large shaft 203 of the sealing shoe No. 7 200 and the sealing shoe No. 8 201, a current loop is formed, and at this time, the current is the sum of the currents on the sealing shoe No. 7 200 and the sealing shoe No. 8 201, and therefore, the parallel resistance value can be calculated by measuring the current at the output end of the coil and the voltage on the sealing shoe No. 8 201. Further, since the diameter of the large shaft 203 of the generator rotor 202 reaches approximately 1 meter, the current on the large shaft 203 can be acquired by ring CT. The annular CT may be sleeved on the large shaft 203 of the generator rotor 202 and disposed near the first seal shoe (seal shoe No. 7 200).
In some embodiments, the measuring device 101 is configured to measure the current collected by the current collection device 104 and the voltage value on the second sealing tile to obtain the second voltage value and the input current. Specifically, the second voltage value is the voltage value on the sealing tile No. 8 201, that is, when the induced electromotive force is transmitted to the sealing tile No. 8 201, the voltage value on the sealing tile No. 8 201 can be directly measured. The input current is sleeved on the large shaft 203 of the generator rotor 202 and is close to the annular CT-acquired current at the sealing tile number 7 200. Therefore, the current acquired by the annular CT and the voltage value of the sealing tile No. 8 201 are measured by the measuring equipment 101, and the resistance value of the sealing tile of the generator can be converted. Further, in some embodiments, the resistance of the generator sealing tile according to the embodiments of the present invention is a parallel value of the first sealing tile and the second sealing tile. Namely the parallel resistance value of the sealing tile No. 7 200 and the sealing tile No. 8 201.
Further, in some embodiments, further comprising: and the control unit is used for obtaining the resistance value of the generator sealing tile according to the input current and the second voltage value. Specifically, after the measuring device 101 measures the input current and the second voltage value, the control unit makes the second voltage value and the input current as a quotient of the obtained second voltage value and the input current, that is, the resistance value of the generator sealing tile, that is, the parallel resistance value of the sealing tile No. 7 200 and the sealing tile No. 8 201. Accordingly, after the parallel resistance values of the sealing tiles No. 7 200 and No. 8 201 are obtained, the insulation of the sealing tiles No. 7 200 and No. 8 201 can be measured from the parallel resistance values. For example, if the sealing tile No. 7 200 and/or the sealing tile No. 8 are not qualified in insulation, it can be determined according to the obtained parallel resistance value.
Specifically, assume that the voltage value of sealing tile number 8 201 is U 8 The input current is I Into (I) The parallel resistance value of the sealing tile No. 7 200 and the sealing tile No. 8 201 is R And is combined with Then it is possible to obtain:
R and is combined with ＝U 8 /I Into (I) 。
Thus, R is obtained according to the above And is combined with The insulating effect of the sealing shoe No. 7 200 and/or the sealing shoe No. 8 201 can be determined.
Further, as shown in fig. 4, the present invention provides a method for measuring the resistance of the sealing shoe of the generator by using the induced electromotive force and the input current generated by the coil in the large shaft 203 of the generator rotor 202.
Specifically, as shown in fig. 4, the method for measuring the resistance of the sealing tile of the generator by using the induced voltage method may include: step S10, step S20, step S30, step S40, step S50, and step S60.
Step S10, the ac source 103 is started.
In some embodiments, the ac source 103 is configured to provide an ac signal to the voltage generating device 102 after activation. Alternatively, the ac source 103 includes, but is not limited to, a movable ac source 103. The output voltage of the ac source 103 may be selectively determined according to the measurement requirement of the present invention, which is not particularly limited. Further, as shown in fig. 2 and 3, the output terminal of the ac source 103 is connected to the input terminal of the voltage generating device 102, and outputs an ac signal to the input terminal of the voltage generating device 102 after the start-up.
In step S20, after the ac source 103 is started, an ac signal is output to the voltage generating device 102.
In step S30, the voltage generating device 102 generates an alternating signal according to the alternating signal, and transmits the alternating signal into the large shaft 203 of the generator rotor 202.
In some embodiments, the voltage generating device 102 includes: a multi-turn excitation coil. Wherein the multi-turn excitation coil is sleeved on the large shaft 203 of the generator rotor 202 and is arranged close to the first sealing tile. In the embodiment of the present invention, the first sealing tile is a sealing tile No. 7 200 (as shown in fig. 2). Specifically, after the ac signal output by the ac source 103 is introduced into the voltage generating device 102, the magnetic flux in the large shaft 203 of the generator rotor 202 where the voltage generating device 102 is located begins to alternate, and in the large shaft 203 of the same section of rotor 202, an induced electromotive force is generated, and the generated induced electromotive force is transferred to the large shaft 203 of the sealing tile No. 7 200 and the sealing tile No. 8 201, so that the sealing tile No. 7 200 and the sealing tile No. 8 can form a parallel voltage signal.
Step S40, after the alternating signal is transmitted into the large shaft 203 of the generator rotor 202, a second voltage value is obtained. The second voltage value is the voltage value on the second sealing tile.
In some embodiments, after the alternating signal is transmitted into the large shaft 203 of the generator rotor 202, obtaining the second voltage value includes: after the alternating signal is transmitted into the large shaft 203 of the generator rotor 202, the voltage at both ends of the second sealing shoe is measured by the measuring device 101, and a second voltage value is obtained.
In step S50, after the alternating signal is transmitted into the large shaft 203 of the generator rotor 202, an input current is obtained.
Specifically, in some embodiments, after the alternating signal is transmitted into the large shaft 203 of the generator rotor 202, obtaining the input current includes: after alternating signals are transmitted into the large shaft 203 of the rotor 202 of the generator, current on the large shaft 203 of the rotor 202 is collected through the current collecting device 104; the input current is obtained by measuring the current acquired by the current acquisition means 104 by the measuring device 101.
Specifically, when the magnetic flux in the large shaft 203 of the rotor 202 in the coil starts to alternate, an induced electromotive force is generated and transmitted to the large shaft 203 of the sealing shoe No. 7 200 and the sealing shoe No. 8 201, a current loop is formed, and at this time, the current is the sum of the currents on the sealing shoe No. 7 200 and the sealing shoe No. 8 201, and therefore, the parallel resistance value can be calculated by measuring the current at the output end of the coil and the voltage on the sealing shoe No. 8 201. Further, since the diameter of the large shaft 203 of the generator rotor 202 reaches approximately 1 meter, the current on the large shaft 203 can be acquired by ring CT. The annular CT may be sleeved on the large shaft 203 of the generator rotor 202 and disposed near the first seal shoe (seal shoe No. 7 200).
Further, after the ring CT collects the current on the large axis 203, the measuring device 101 can directly measure the current collected by the ring CT, so as to obtain the input current.
And step S60, obtaining the resistance value of the generator sealing tile according to the input current and the second voltage value.
Specifically, after the measuring device 101 measures the input current and the second voltage value, the control unit makes the second voltage value and the input current as a quotient of the obtained second voltage value and the input current, that is, the resistance value of the generator sealing tile, that is, the parallel resistance value of the sealing tile No. 7 200 and the sealing tile No. 8 201. Thus, after the parallel resistance values of the sealing shoe 200 and the sealing shoe 201 No. 7 are obtained, the insulation of the sealing shoe 200 and/or the sealing shoe 201 No. 7 can be measured from the parallel resistance values. For example, if the sealing tile number 8 201 is not insulated properly, it can be determined based on the obtained parallel resistance value.
Specifically, assume that the voltage value of sealing tile number 8 201 is U 8 The input current is I Into (I) The parallel resistance value of the sealing tile No. 7 200 and the sealing tile No. 8 201 is R And is combined with Then it is possible to obtain:
R and is combined with ＝U 8 /I Into (I) 。
Thus, R is obtained according to the above And is combined with It is determined whether the insulating effect of the sealing tile No. 8 201 meets the standard.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made with the scope of the claims should be covered by the claims.
Claims (8)
1. A method for measuring the resistance of a sealing shoe of a generator by an induced voltage method, which is characterized in that the method is applied to a sealing shoe measuring device of the generator without disassembly of a wheel, and the sealing shoe measuring device of the generator comprises the following steps: the device comprises measuring equipment, a voltage generating device, an alternating current source and a current collecting device, wherein the voltage generating device is arranged on a large shaft of a generator rotor and is close to a first sealing tile; the first sealing tile and the second sealing tile are positioned at two ends of the generator rotor; the method comprises the following steps:
starting the alternating current source;
after the alternating current source is started, an alternating current signal is output to the voltage generating device;
the voltage generating device generates an alternating signal according to the alternating signal and transmits the alternating signal into the large shaft of the generator rotor, and the first sealing tile and the second sealing tile form a parallel voltage signal;
after the alternating signal is transmitted into the large shaft of the generator rotor, measuring the voltage at two ends of the second sealing tile through the measuring equipment to obtain a second voltage value;
after the alternating signal is transmitted into the large rotor shaft of the generator, collecting current on the large rotor shaft through the current collecting device, measuring the current collected by the current collecting device through the measuring equipment, and obtaining input current;
and obtaining the resistance of the generator sealing tile according to the input current and the second voltage value, wherein the resistance of the generator sealing tile is the parallel connection value of the first sealing tile and the second sealing tile.
2. The method of measuring a resistance of a generator seal tile according to claim 1, wherein obtaining the resistance of the generator seal tile based on the input current and the second voltage value comprises:
the second voltage value and the input current are taken as a quotient, and the quotient of the second voltage value and the input current is obtained; and the quotient of the second voltage value and the input current is the resistance value of the generator sealing tile.
3. The method for measuring the resistance of a sealing shoe of a generator by an induced voltage method according to claim 1, wherein the current collecting device comprises: annular CT.
4. The method for measuring the resistance of a sealing shoe of a generator by an induced voltage method according to claim 1, wherein the voltage generating means comprises: a multi-turn excitation coil.
5. The method of measuring the resistance of a generator seal tile by an induced voltage method of claim 1, further comprising:
and judging the insulation effect of the generator sealing tile according to the resistance value of the generator sealing tile.
6. The utility model provides a device of generator seal tile resistance is measured to induced voltage method which characterized in that, including the generator seal tile measuring device and the control unit of not tearing the wheel of registering, generator seal tile measuring device includes: the device comprises measuring equipment, a voltage generating device, an alternating current source and a current collecting device, wherein the voltage generating device is arranged on a large shaft of a generator rotor and is close to a first sealing tile; the first sealing tile and the second sealing tile are positioned at two ends of the generator rotor;
the alternating current source is used for providing alternating current signals for the voltage generating device after the alternating current source is started;
the voltage generating device is used for generating an alternating signal according to the alternating signal and transmitting the alternating signal into a large shaft of the generator rotor, and the first sealing tile and the second sealing tile form a parallel voltage signal;
the current acquisition device is used for acquiring current on a large shaft of the generator rotor;
the measuring equipment is used for measuring the current acquired by the current acquisition device and the voltage values at the two ends of the second sealing tile so as to obtain a second voltage value and an input current;
the control unit is used for obtaining the resistance value of the generator sealing tile according to the input current and the second voltage value, and the resistance value of the generator sealing tile is the parallel connection value of the first sealing tile and the second sealing tile.
7. The device for measuring the resistance of the sealing shoe of the generator by using the induced voltage method according to claim 6, wherein the current collecting device comprises: annular CT.
8. The apparatus for measuring resistance of a generator seal tile by an induced voltage method according to claim 6, wherein said voltage generating means comprises: a multi-turn excitation coil.
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| CN202010632055.XA CN111983323B (en) | 2020-07-03 | 2020-07-03 | Method and device for measuring resistance of generator sealing tile by induced voltage method |
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| CN202010632055.XA CN111983323B (en) | 2020-07-03 | 2020-07-03 | Method and device for measuring resistance of generator sealing tile by induced voltage method |
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