CN111007317A - Device and method for measuring insulation to ground of excitation end sealing tile of generator - Google Patents
Device and method for measuring insulation to ground of excitation end sealing tile of generator Download PDFInfo
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- CN111007317A CN111007317A CN201911174968.5A CN201911174968A CN111007317A CN 111007317 A CN111007317 A CN 111007317A CN 201911174968 A CN201911174968 A CN 201911174968A CN 111007317 A CN111007317 A CN 111007317A
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- 238000007789 sealing Methods 0.000 title claims abstract description 68
- 238000009413 insulation Methods 0.000 title claims abstract description 51
- 230000005284 excitation Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- 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
-
- 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
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention relates to a device and a method for measuring the insulation to ground of a sealing tile of an excitation end of a generator, wherein the device for measuring the insulation to ground comprises the following components: the first annular current transformer is arranged on a rotor large shaft between a generator excitation end sealing tile and an exciter; the second annular current transformer is arranged on the rotor large shaft between the steam end sealing tile of the generator and the paired wheel; the positive end of the voltage source is connected with a rotor large shaft close to an exciter, and the negative end of the voltage source is grounded; and the signal processing device is used for determining whether the excitation end sealing tile of the generator is insulated from the ground or not according to the voltage value of the voltage source and the measured current values of the first annular current transformer and the second annular current transformer. By implementing the technical scheme of the invention, the insulation measurement of the exciter end sealing tile to the ground can be realized under the condition of not detaching the pair wheels, and the time and the labor for detaching the pair wheels are saved.
Description
Technical Field
The invention relates to the field of electrical maintenance, in particular to a device and a method for measuring insulation to ground of a sealing tile of an excitation end of a generator.
Background
As shown in fig. 1, in order to prevent high-pressure hydrogen inside the hydrogen-cooled generator from leaking along a gap between a casing and a rotor at both ends of the generator, sealing shoes, i.e., 7-watt sealing shoes and 8-watt sealing shoes (referring to the sealing shoes and the bearing shoes), are respectively installed at a steam end (a turbine end) and an excitation end (an exciter end) of the generator. In actual operation, the voltage at 7 watts is close to 0, so that the insulation of 7 watts has no influence on the generator, but the voltage at 8 watts is about 3-10V, and the problem that the bearing bush is burnt by circulation current caused by failure in operation can be avoided only by keeping the insulation of 8 watts against the ground, so that the insulation of 8 watts under the 10V state needs to be accurately known, and the influence of the insulation on operation is judged. If the insulation is not good at 10V, there will be a large current passing through 8 watts causing damage.
The sealing bush of some generators is only insulated to the ground, and has no insulation to the rotor shaft, and the sealing bush is always communicated with the large shaft during overhaul. The bearing bush is provided with double-channel insulation, the rotor shaft and the ground are both insulated, the bearing bush is convenient to measure the insulation, and a megger is directly used for measuring the middle of the two insulation. The sealing bush is communicated with the large shaft, 1-6 watts are not specially insulated to the ground, the sealing bush is insulated by oil in operation, and the 1-6 watts are grounded to the ground because the bearing bush oil is completely stopped in overhaul. Therefore, if the insulation of the 8-watt sealing shoe to the ground is measured in the overhaul, the coupling with the steam turbine must be disconnected, otherwise, the generator rotor large shaft is connected with the steam turbine large shaft through the coupling, and the insulation is 0. The disconnection of the coupling between the steam turbine and the generator is work with large workload, 4 persons are required to work for 20 hours, the operation is difficult, one of the two rotors is pushed away along the axial direction after the coupling is disassembled, the rotors are pushed back after insulation measurement is completed, the two rotors of the steam turbine and the generator are not concentric after reconnection, and the time for finding the center again is several days.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for measuring the insulation to ground of a sealing tile of a field end of a generator aiming at the defect that the insulation to ground of the sealing tile of the field end is difficult to measure in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the earth insulation measuring device for constructing the excitation end sealing tile of the generator, which is used for measuring the earth insulation of the excitation end sealing tile of the generator during overhaul, comprises:
the first annular current transformer is arranged on a rotor large shaft between a generator excitation end sealing tile and an exciter;
the second annular current transformer is arranged on the rotor large shaft between the steam end sealing tile of the generator and the paired wheel;
the positive end of the voltage source is connected with a rotor large shaft close to an exciter, and the negative end of the voltage source is grounded;
and the signal processing device is used for determining whether the excitation end sealing tile of the generator is insulated from the ground or not according to the voltage value of the voltage source and the measured current values of the first annular current transformer and the second annular current transformer.
Preferably, the dotted terminal of the first ring current transformer is connected to the dotted terminal of the second ring current transformer, and the secondary current output terminal of the first ring current transformer is connected to the secondary current output terminal of the second ring current transformer.
Preferably, the exciter further comprises a current limiting resistor, and one end of the current limiting resistor is connected with the positive end of the voltage source, and the other end of the current limiting resistor is connected with the rotor large shaft close to the exciter.
Preferably, a protection switch is further included, and one end of the protection switch is connected to the positive end of the voltage source and the other end is connected to the rotor large shaft near the exciter.
Preferably, the frequency of the voltage source is higher than the power frequency.
Preferably, the voltage source has a frequency of 1kHz and an amplitude of 0.3-0.5V.
Preferably, the first and second ring current transformers are rogowski coil current transformers.
The invention also constructs a method for measuring the insulation to ground of the excitation end sealing tile of the generator, and the method comprises the following steps during overhaul:
a first annular current transformer is arranged on a rotor large shaft between a generator excitation end sealing bush and an exciter;
a second annular current transformer is arranged on a rotor large shaft between the steam end sealing tile of the generator and the paired wheel;
setting a voltage source to apply a voltage to a rotor large shaft near the exciter;
and arranging a signal processing device to determine whether the excitation end sealing tile of the generator is insulated from the ground or not according to the voltage value of the voltage source and the measured current values of the first annular current transformer and the second annular current transformer.
Preferably, the method further comprises the following steps:
and connecting the homonymous end of the second annular current transformer with the homonymous end of the first annular current transformer, and connecting the secondary current output end of the second annular current transformer with the secondary current output end of the first annular current transformer.
Preferably, the method further comprises the following steps:
a current limiting resistor and/or a protection switch is arranged between the positive end of the voltage source and the rotor large shaft close to the exciter.
Preferably, the frequency of the applied voltage to the rotor large shaft close to the exciter is greater than the mains frequency.
According to the technical scheme provided by the invention, the insulation measurement of the exciter end sealing tile to the ground can be realized under the condition that the pair wheel is not disassembled, and the time and the labor for disassembling the pair wheel are saved.
Drawings
In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort. In the drawings:
FIG. 1 is a schematic structural diagram of a conventional steam turbine and generator shafting;
FIG. 2 is a schematic diagram of a first embodiment of the insulation to ground measuring device of the excitation end sealing tile of the generator of the invention;
FIG. 3 is a circuit diagram of a second embodiment of the insulation to ground measuring device of the excitation end sealing tile of the generator of the invention;
fig. 4 is a flow chart of a first embodiment of the method for measuring the insulation to ground of the excitation end sealing tile of the generator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a schematic diagram of a first embodiment of the device for measuring insulation to ground of the excitation end sealing shoe of the generator of the present invention, and first, it is explained that 24 is a rotor of the generator, 25 is a stator core of the generator, 26 is a pair wheel, 23 is a rotor large shaft, 21 is the excitation end sealing shoe, 22 is the steam end sealing shoe, and the steam end sealing shoe 22 is basically directly grounded, no voltage exists during operation, and the insulation is good and bad without affecting the operation. Therefore, this embodiment is merely illustrative of how the insulation to ground of the tip seal shoe 21 can be measured during overhaul without disassembling the pair of wheels 26. In this embodiment, the ground insulation measuring device includes: the device comprises a first annular current transformer 11, a first annular current transformer 12, a voltage source 13 and a signal processing device 14, wherein the first annular current transformer 11 is arranged on a rotor large shaft 23 between a generator excitation end sealing tile 21 and an exciter (not shown); the second annular current transformer 12 is arranged on the rotor large shaft 23 between the generator steam end sealing tile 22 and the pair wheel 26 (not shown); the positive end of the voltage source 13 is connected to the rotor large shaft 23 close to the exciter, and the negative end of the voltage source 13 is grounded; the signal processing device 14 is used for determining whether the excitation end sealing tile 21 of the generator is insulated from the ground or not according to the voltage value of the voltage source 13 and the measured current values of the first annular current transformer 11 and the second annular current transformer 12.
In this embodiment, in the current measurement loop, the measured current value of the first annular current transformer 11 is subtracted from the measured current value of the second annular current transformer 12 to obtain the leakage current of the excitation end sealing shoe 21 of the generator insulated from the ground, and then the voltage value of the voltage source 13 is divided by the leakage current value to obtain the insulation resistance of the excitation end sealing shoe 21 of the generator insulated from the ground.
Preferably, the first ring current transformer 11 and the first ring current transformer 12 are current transformers of the same type, so that the measurement accuracy of the ground insulation can be improved due to the fact that errors measured by the currents are the same. In addition, the first annular current transformer 11 and the first annular current transformer 12 are preferably rogowski coil current transformers, and the rogowski coil current transformers adopt a plug-in design, so that the rogowski coil current transformers are convenient to connect on site, and a tested main loop does not need to be detached during connection.
Fig. 3 is a circuit diagram of a second embodiment of the device for measuring insulation to ground of the excitation end sealing shoe of the generator of the present invention, in which 211 is the resistance to ground of the excitation end sealing shoe 21, 221 is the resistance to ground of the steam end sealing shoe 22, and 241 is the equivalent inductive reactance of the rotor 21, and the first annular current transformer 11 is disposed on the rotor main shaft 23 between the excitation end sealing shoe 21 of the generator and the exciter (not shown), and the second annular current transformer 12 is disposed on the rotor main shaft 23 between the steam end sealing shoe 22 of the generator and the counter wheel 26 (not shown).
In this embodiment, the dotted terminal of the first ring current transformer 11 is connected to the dotted terminal of the second ring current transformer 12, and the secondary current output terminal of the first ring current transformer 11 is connected to the secondary current output terminal of the second ring current transformer 12, so that the leakage current of the generator field terminal sealing tile 21 insulated from the ground is directly output from the secondary current output terminals of the first ring current transformer 11 and the second ring current transformer 12.
Further, since the inductive reactance 241 of the rotor is very low, the voltage applied by the voltage source 13 is generally 0.3-0.5V under the condition that the injected current is not more than 1A, so that the measurement effect on the ground insulation is poor, and in order to increase the applied voltage without increasing the injected current, the frequency of the voltage source 13 can be increased to be higher than the power frequency (50 Hz). Preferably, the voltage source 13 has a frequency of 1kHz and an amplitude of 0.3-0.5V, which increases the inductive reactance 241(wL) of the rotor by a factor of 20 at mains frequency, increases the injected voltage by around 10V, generates a voltage of about 10V across the field end seal shoe 21, and increases the sensitivity to insulation measurements when measuring insulation to ground.
Further, if the excitation end bearing bush (not shown) has insulation damage to the ground, the current of the excitation end bearing bush to the ground can exceed 1A after pressurization, the damage of the bearing bush can be caused by the heat effect of the excitation end bearing bush, and in order to avoid the condition, a current limiting resistor 14 is further arranged at a power outlet. In addition, in order to ensure that the current is not greater than 1A even when the resistance of the excitation end bearing bush to the ground is equal to 0, a protection switch 15 is arranged at a power outlet, and when the current is greater than 1A, the protection switch 15 immediately trips to protect the bearing bush. Therefore, in this embodiment, one end of the current limiting resistor 14 is connected to the positive terminal of the voltage source 13, and the other end of the current limiting resistor 14 is connected to the rotor large shaft near the exciter through the protection switch 15.
Finally, it should also be noted that, in this exemplary embodiment, means 16 for current measurement and means 17 for voltage measurement may be provided in order to facilitate the signal processing by the signal processing means 14.
Through the technical scheme, the ground insulation measurement of the excitation end sealing tile can be realized under the condition of not detaching the paired wheels by utilizing the large-caliber annular Rogowski coil current transformer, so that the time and the labor for detaching the paired wheels are saved; the voltage on the excitation end sealing tile is improved by using the high-frequency power supply, the testing sensitivity is improved, the level which is the same as the operating voltage is reached, the insulating leakage current is basically equivalent to the real operating leakage current when the insulation is determined to be maintained, and the leakage current level under the 8-watt operating state is accurately judged.
Fig. 4 is a flowchart of a first embodiment of the method for measuring insulation against ground of the excitation end sealing shoe of the generator, in the method for measuring insulation against ground of this embodiment, the following steps are performed during overhaul:
s11, arranging a first annular current transformer on a rotor large shaft between a sealing tile at the excitation end of the generator and an exciter;
s12, arranging a second annular current transformer on a rotor large shaft between a steam end sealing tile of the generator and the pair wheel;
s13, setting a voltage source to apply voltage to the rotor large shaft close to the exciter, preferably, the frequency of the voltage applied to the rotor large shaft close to the exciter is greater than the power frequency;
and S14, setting a signal processing device to determine whether the excitation end sealing tile of the generator is insulated from the ground or not according to the voltage value of the voltage source and the measured current values of the first annular current transformer and the second annular current transformer.
Further, still include: and connecting the homonymous end of the second annular current transformer with the homonymous end of the first annular current transformer, and connecting the secondary current output end of the second annular current transformer with the secondary current output end of the first annular current transformer.
Further, still include: a current limiting resistor and/or a protection switch is arranged between the positive end of the voltage source and the rotor large shaft close to the exciter.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (11)
1. A device for measuring the insulation to ground of a generator excitation end sealing tile, which is used for measuring the insulation to ground of the generator excitation end sealing tile in overhaul, and is characterized by comprising:
the first annular current transformer is arranged on a rotor large shaft between a generator excitation end sealing tile and an exciter;
the second annular current transformer is arranged on the rotor large shaft between the steam end sealing tile of the generator and the paired wheel;
the positive end of the voltage source is connected with a rotor large shaft close to an exciter, and the negative end of the voltage source is grounded;
and the signal processing device is used for determining whether the excitation end sealing tile of the generator is insulated from the ground or not according to the voltage value of the voltage source and the measured current values of the first annular current transformer and the second annular current transformer.
2. The device for measuring the insulation to ground of the excitation end sealing tile of the generator as claimed in claim 1, wherein the homonymous terminal of the first annular current transformer is connected with the homonymous terminal of the second annular current transformer, and the secondary current output terminal of the first annular current transformer is connected with the secondary current output terminal of the second annular current transformer.
3. The device for measuring the insulation to ground of the excitation end sealing tile of the generator according to claim 1, further comprising a current limiting resistor, wherein one end of the current limiting resistor is connected with the positive end of the voltage source, and the other end of the current limiting resistor is connected with the rotor large shaft close to the exciter.
4. The apparatus of claim 1, further comprising a protection switch, wherein one end of the protection switch is connected to the positive terminal of the voltage source, and the other end is connected to the rotor shaft near the exciter.
5. The device for measuring the insulation to ground of a field end sealing tile of a generator according to claim 1, wherein the frequency of the voltage source is higher than the frequency of power frequency.
6. The insulation to ground measuring device of the excitation end sealing tile of the generator according to claim 5, wherein the frequency of the voltage source is 1kHz, and the amplitude is 0.3-0.5V.
7. The apparatus of claim 1, wherein the first and second ring current transformers are rogowski coil current transformers.
8. A method for measuring the insulation to ground of a sealing tile of a field end of a generator is characterized by comprising the following steps during overhaul:
a first annular current transformer is arranged on a rotor large shaft between a generator excitation end sealing bush and an exciter;
a second annular current transformer is arranged on a rotor large shaft between the steam end sealing tile of the generator and the paired wheel;
setting a voltage source to apply a voltage to a rotor large shaft near the exciter;
and arranging a signal processing device to determine whether the excitation end sealing tile of the generator is insulated from the ground or not according to the voltage value of the voltage source and the measured current values of the first annular current transformer and the second annular current transformer.
9. The method for measuring the insulation to ground of the excitation end sealing tile of the generator according to claim 8, further comprising the following steps:
and connecting the homonymous end of the second annular current transformer with the homonymous end of the first annular current transformer, and connecting the secondary current output end of the second annular current transformer with the secondary current output end of the first annular current transformer.
10. The method for measuring the insulation to ground of the excitation end sealing tile of the generator according to claim 8, further comprising the following steps:
a current limiting resistor and/or a protection switch is arranged between the positive end of the voltage source and the rotor large shaft close to the exciter.
11. The method of claim 8, wherein the frequency of the voltage applied to the rotor large shaft near the exciter is greater than the power frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911174968.5A CN111007317A (en) | 2019-11-26 | 2019-11-26 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911174968.5A CN111007317A (en) | 2019-11-26 | 2019-11-26 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
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| CN111007317A true CN111007317A (en) | 2020-04-14 |
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| CN201911174968.5A Pending CN111007317A (en) | 2019-11-26 | 2019-11-26 | Device and method for measuring insulation to ground of excitation end sealing tile of generator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983323A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by induction voltage method |
| CN111983324A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by equipotential method |
| CN111983325A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring resistance value of generator sealing tile by current time method |
| CN111983393A (en) * | 2020-07-03 | 2020-11-24 | 中广核核电运营有限公司 | Method and device for measuring insulation of generator sealing tile by voltage time method |
| CN115356535A (en) * | 2022-07-18 | 2022-11-18 | 中广核核电运营有限公司 | Sealing tile insulation resistance test method and circuit |
| CN115356536A (en) * | 2022-07-18 | 2022-11-18 | 中广核核电运营有限公司 | Sealing tile insulation resistance test method and circuit |
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| CN115356536A (en) * | 2022-07-18 | 2022-11-18 | 中广核核电运营有限公司 | Sealing tile insulation resistance test method and circuit |
| CN115356535B (en) * | 2022-07-18 | 2025-04-22 | 中广核核电运营有限公司 | Sealing tile insulation impedance test method and circuit |
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Application publication date: 20200414 |