CN111682712B - A field installation method of a large generator end vibration monitoring device - Google Patents
A field installation method of a large generator end vibration monitoring device Download PDFInfo
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- CN111682712B CN111682712B CN202010601913.4A CN202010601913A CN111682712B CN 111682712 B CN111682712 B CN 111682712B CN 202010601913 A CN202010601913 A CN 202010601913A CN 111682712 B CN111682712 B CN 111682712B
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- 239000002826 coolant Substances 0.000 claims abstract description 4
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- 239000013307 optical fiber Substances 0.000 claims description 52
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/20—Shaping or compacting conductors or winding heads after the installation of the winding in the cores or machines; Applying fastening means on winding heads
- H02K15/24—Shaping or compacting winding heads
- H02K15/26—Applying fastening means on winding heads
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a field installation method of a large generator end vibration monitoring device. The invention relates to a method for effectively and firmly installing a stator winding end vibration embedded type online monitoring device on site, wherein a cooling medium of a hydrogen cooling unit is hydrogen, so that explosion danger exists once leakage reaches a certain concentration, meanwhile, a part of a main body in the unit is a rotor rotating at a high speed, when an internal device is installed badly and parts are loosened or fall off, a large error exists in a test result, even serious faults occur in a misleading power station exceeding an alarm limit, so that misdiagnosis system diagnosis is caused to cause mishalt, or serious accidents such as damage of rotating parts and winding insulation damage short circuit are caused by falling of the devices, so that the parts are effective and reliable, and a suitable wiring path is very critical.
Description
Technical Field
The invention relates to a field installation method of a large generator end vibration monitoring device.
Background
For a large hydrogen-cooled steam turbine generator unit, the rotating speed is high, the lengths of the stator winding and the end lead are both longer, the structure is similar to a cantilever beam structure, and the stress condition of the end part is more complex. The end of the stator winding of the generator is subjected to the action of alternating electromagnetic force during normal operation and huge impact of electromagnetic force during sudden short circuit. Over-large vibration for a long time can cause loosening of fastening structural members at the end parts of the stator windings of the generator and insulation abrasion of the winding bars, and can also cause breakage of the strand wires due to mechanical fatigue, and serious faults can cause short circuit accidents between phases at the end parts. And the vibration state of the end part cannot be constant, under the long-term action of alternating electromagnetic force and thermal stress, the modal parameters of the end part of the winding can be changed due to insulation shrinkage and abrasion or local looseness of a fastener, and after the fully qualified generator runs for a long time in operation, the natural frequency of the fully qualified generator can fall into a 'resonance region' range of 95-108 Hz, so that the vibration state is gradually or suddenly deteriorated. However, the general electrical monitoring and external component vibration monitoring do not reflect the dangerous vibration changes, and the occurrence of sudden accidents is difficult to avoid.
Due to manufacturing installation and long-term operation, the iron core of the generator motor can generate short circuit or loose and shift of the silicon steel sheets of the iron core under the comprehensive actions of electricity, heat, chemistry, vibration and the like for a long time. When iron core silicon steel sheet short circuit, can make the iron loss increase, cause the iron core local overheat, silicon steel sheet and stator winding insulation aging with higher speed can cause the iron core to burn out even stator winding punctures when serious, and the iron core is not hard up simultaneously also can make unit vibration increase, produces electromagnetic noise, harm unit operation. When stator core produced not hard up trouble, stator winding tip modal parameter can change correspondingly, can in time predict stator winding tip and to stator core's abnormal change through the change of stator winding tip vibration parameter, early warning, the emergence of avoiding malignant accident is handled as early as possible. Therefore, it is necessary to directly monitor the vibration of the stator winding end, and the on-line monitoring of the vibration of the generator stator winding end is realized.
The on-line monitoring research on the vibration of the stator winding end of the turbonator starts late in China, and the on-line monitoring research on the vibration of the stator winding end of the turbonator is deeper and more concerned at home and abroad after 2000 years. The end part structure of the stator winding of the turbonator is easy to wear and loosen due to the particularity of the end part structure and the high rotating speed of 3000 revolutions per minute, so that the end part structure becomes a key point for the on-line monitoring and research of the end part vibration of the stator winding of the turbonator, and the research of the hydrogenerator on the aspect is blank. In 1991, Shanghai Motor factory and Chengdu electronic science and technology university develop a first set of domestic stator winding end vibration online monitoring system, and published a paper "measuring large-scale turbonator stator winding end vibration by using optical fiber sensing technology", and the monitoring system is not popularized and used due to limitation to the current measurement and control technology level. The university of southern China university in 2002 published academic papers on the development of an on-line vibration monitoring system for the stator winding end of a large-scale turbonator for a plurality of reasons, and products do not form an application scale. The Bai Asian teacher of the Limited liability company of the North China Power science research institute also discloses a basic idea of applying foreign online monitoring products to carry out online monitoring on the vibration of the stator winding end of the turbonator, but the development and application of the domestic online monitoring system for the vibration of the stator winding end of the turbonator are basically before 2005, products and test methods used by domestic units at present adopt products and technologies with high prices which are all adopted by Swiss MC company, Canada maintenance and American WH company, and the online monitoring products for the vibration of the stator winding end of the turbonator which are independently developed in China are basically not developed and popularized due to the high price of basic materials and are not innovated. The on-line vibration monitoring and measuring system for the stator winding end of the steam turbine generator is developed and researched on the basis of developing years of research on the vibration of the stator winding end of the hydrogen-cooled steam turbine generator, and is formed on the basis of adopting a minimum number of domestic self-developed sensing devices, demodulating devices, integrated peripheral circuits and reliable software algorithms, so that the on-line vibration monitoring and measuring system for the stator winding end of the steam turbine generator is realized, the cost of the system is reduced, and the innovation of the software and hardware construction of the system is completed.
Disclosure of Invention
The invention provides a field installation method of a large generator end vibration monitoring device, and aims to solve the problems that after long-term operation, although the large generator end vibration monitoring device is subjected to repeated overhaul inspection, a plurality of old units in service for decades exist in the prior art, internal insulation aging and fixed structure firmness degrees are all relatively deficient compared with a new unit, so that operation hidden dangers exist, particularly, the problems of loose structure, insulation damage, end piece stringing and the like are easily caused by the particularity of an end structure, the problems are not suddenly caused but are gradually accumulated and formed along with the long-term operation of the unit, and cannot be monitored through an external vibration sensing device, so that the direct monitoring of the end of a winding is the most direct, effective and economical method.
The technical scheme adopted by the invention comprises the following steps:
1) determining the placement position of the optical fiber vibration sensor: an optical fiber vibration sensor is placed at the nose end of a bar in the middle of the upper part of the steam end, an optical fiber vibration sensor is placed at the involute part of the bar with the optical fiber vibration sensor placed at 135 degrees, an optical fiber vibration sensor is placed at the nose end of a bar at the excitation end, and an optical fiber vibration sensor is installed on the involute part of the bar with the optical fiber vibration sensor placed at 135 degrees;
2) fixing the optical fiber vibration sensor: the optical fiber vibration sensor is indicated by a vibration direction arrow, after the optical fiber vibration sensor is placed in a direction perpendicular to the axis according to the indication arrow, an industrial glass ribbon for the optical fiber vibration sensor is bundled together with a winding wire rod at the place, the bundling firmness is determined, the melted fixing glue is brushed on the industrial glass ribbon, and the industrial glass ribbon is kept stand for 12 hours, so that the glue solution completely permeates into the industrial glass ribbon;
3) leading out and fixing the optical fiber vibration sensor: the optical fiber vibration sensor is provided with an optical cable which is sufficiently led out of the unit, the optical cables at the steam end and the excitation end are respectively arranged to the access hole cover plates of the coolers of the stator base at two ends along the rib plates in the base, the optical cable is fixed by adopting a metal wire clamp, the metal wire clamp is welded along the inner wall of the base and the rib plates, the optical fiber is wound by an industrial glass fiber tape and is fixed in the metal wire clamp until the optical cable is arranged to the access hole cover plates of the coolers of the stator base;
4) the through sealing device is sealed and fixed: the hydrogen-cooled turbogenerator adopts hydrogen as a cooling medium, the internal hydrogen pressure is 0.4-0.5MPa, two through sealing devices are respectively arranged on the inlet hole cover plates of the steam end and the excitation end, the two inlet hole cover plates are cleaned before installation, installation holes matched with the through sealing devices are arranged on the inlet hole cover plates, metal scraps of the inlet hole cover plates are cleaned, polyethylene O-shaped sealing rings are placed, special sealant is fully coated at the thread positions of the through sealing devices, the through sealing devices are arranged on the inlet hole cover plates and fixed by applying pre-tightening force, and special sealant for the generator is coated at the matching positions of the through sealing devices and the inlet hole cover plates after fastening;
5) switching of the optical cables inside and outside the unit: respectively connecting the optical fiber tail fiber joints of the optical fiber vibration sensor at the steam excitation end in the generator to terminals of two through sealing devices facing the interior of the generator, fixing two manhole cover plates on a base after the internal optical fibers are installed and fixed, and then connecting the other ends of the terminals of the through sealing devices to joints of the composite optical cable;
6) installing a key phase sensor and a rotating speed sensor: installing a key phase sensor and a rotating speed sensor on the side surface of a rotor shaft of a generator, fixing the key phase sensor and the rotating speed sensor on an installation support, enabling a probe to face a key phase groove, fixing the installation support on the surface of a platform foundation, and connecting lead wires of the key phase sensor and the rotating speed sensor into an embedded case through a cable groove;
7) assembling embedded type chassis internal parts: an optical demodulator, an embedded acquisition conditioning board, a photoelectric conversion module and a direct current linear power supply module are integrated in an embedded case, the photoelectric conversion module is two in one set, one photoelectric conversion module is installed on a photoelectric conversion module socket of the embedded acquisition conditioning board, the optical demodulator and the direct current linear power supply module are fixed on a reserved position at the upper half part in the embedded case by bolts, the embedded acquisition conditioning board on which the photoelectric conversion module is installed is fixed on a reserved position at the lower half part of the embedded case by bolts, a direct current linear power supply module output power supply lead is connected into the embedded acquisition conditioning board, an optical demodulator output signal wire and a power supply lead are connected to an embedded acquisition conditioning board interface, and the optical demodulator is powered by the embedded acquisition conditioning board;
8) the embedded case is installed and wired in situ: the assembled embedded case is arranged on a platform upright column near the lower part of a generator layer below a generator layer, a joint of a composite optical cable is connected into an optical demodulator interface in the embedded case, output leads of a key phase sensor and a rotating speed sensor are connected into a rotating speed testing interface of an embedded acquisition conditioning board, and an optical port of a photoelectric conversion module on the embedded acquisition conditioning board is connected with an Ethernet optical fiber to a computer system of an operator station;
9) installing a computer system of the embedded online monitoring device: the monitoring device computer system is installed in an electric room of a power plant, an Ethernet optical fiber led out by a photoelectric conversion module in an embedded case is connected to a forward network gate positioned in three areas of the power plant, an optical fiber at the outlet of the forward network gate is connected to an optical port of the photoelectric conversion module of the embedded on-line monitoring device computer system, and a network cable led out by the electric port of the photoelectric conversion module is connected to a host of the embedded on-line monitoring device computer system.
Technical effects
1. The installation method is reliable and practical
The invention provides a complete, practical and simple field installation method of a stator winding end vibration embedded type online monitoring device for online monitoring of stator winding end vibration, adopts a glue dipping and fixing mode of industrial glass ribbons in the installation process, and firmly ties a sensor probe and a coil bar together to form a whole, thereby not only preventing vicious accidents such as damage of rotating parts and short circuit of winding insulation caused by falling off of devices, but also more accurately measuring the vibration condition of the coil bar.
Drawings
FIG. 1 is a view showing the installation layout of the apparatus of the present invention
FIG. 2 is a flow chart of the field installation process of the present invention
Detailed Description
The field installation method of the large generator end vibration monitoring device shown in fig. 1 and 2 comprises the following steps:
1) determining the placement position of the optical fiber vibration sensor: a fiber vibration sensor 1 is placed at the nose end of a bar in the middle of the upper part of the steam end, a fiber vibration sensor 1 is placed at the involute part of the bar, where the fiber vibration sensor 1 is placed, of 135 degrees with the bar, a fiber vibration sensor 1 is placed at the nose end of one bar at the excitation end, and a fiber vibration sensor 1 is installed on the involute part of the bar, where the fiber vibration sensor 1 is placed, of 135 degrees with the bar;
2) fixing the optical fiber vibration sensor: the optical fiber vibration sensor 1 is indicated by a vibration direction arrow, after the optical fiber vibration sensor 1 is placed in the direction perpendicular to the axis according to the indication arrow, the optical fiber vibration sensor 1 is bundled together by an industrial glass ribbon and a winding wire rod at the place of the optical fiber vibration sensor, the bundling firmness is determined, the melted fixing glue is brushed on the industrial glass ribbon, and the industrial glass ribbon is kept stand for 12 hours, so that the glue solution completely permeates into the industrial glass ribbon;
3) leading out and fixing the optical fiber vibration sensor: the optical fiber vibration sensor 1 is provided with an optical cable 14 which is sufficiently led out of a unit, the optical cables 14 at a steam end and an excitation end are respectively arranged at the positions of the inlet hole cover plates 15 of the coolers of the stator bases at two ends along the rib plates in the bases, the optical cable 14 is fixed by adopting a metal wire clamp 16, the metal wire clamp 16 is welded along the inner wall of the base and the rib plates, the optical fiber is wound by an industrial glass fiber tape and is fixed in the metal wire clamp 16 until the optical cable 14 is arranged at the position of the inlet hole cover plates 15 of the coolers of the stators bases;
4) the through sealing device is sealed and fixed: the hydrogen-cooled turbogenerator adopts hydrogen as a cooling medium, the internal hydrogen pressure is 0.4-0.5MPa, two through sealing devices 11 are respectively arranged on the manhole cover plates 15 at the steam end and the excitation end, the two manhole cover plates 15 are cleaned before installation, mounting holes matched with the through sealing devices 11 are formed in the manhole cover plates 15, metal scraps of the manhole cover plates 15 are cleaned, polyethylene O-shaped sealing rings are placed, special sealant is fully coated at the thread parts of the through sealing devices 11, the through sealing devices 11 are arranged on the manhole cover plates 15 and are fixed by pre-tightening force, and special sealant for the generator is coated at the matching parts of the through sealing devices 11 and the manhole cover plates 15 after fastening;
5) switching of the optical cables inside and outside the unit: respectively connecting the optical fiber tail fiber joints of the optical fiber vibration sensor 1 at the steam excitation end in the generator to two terminals of the through sealing device 11 facing the interior of the generator, fixing the two manhole cover plates 15 on the base after the internal optical fiber is installed and fixed, and then connecting the other ends of the terminals of the through sealing device 11 to the joint of the composite optical cable 10;
6) installing a key phase sensor and a rotating speed sensor: installing the key phase sensor 4 and the rotating speed sensor 12 on the side surface of a rotor shaft of the generator, fixing the key phase sensor 4 and the rotating speed sensor 12 on an installation support 17, enabling the probe to face to a key phase groove, fixing the installation support 17 on the surface of a platform foundation, and enabling lead wires of the key phase sensor 4 and the rotating speed sensor 12 to be connected into the embedded case 6 through a cable groove;
7) assembling embedded type chassis internal parts: an optical demodulator 2, an embedded acquisition conditioning plate 3, a photoelectric conversion module 5 and a direct current linear power module 13 are integrated in an embedded case 6, the photoelectric conversion module 5 is two in one set, one photoelectric conversion module 5 is installed on a socket of the photoelectric conversion module 5 of the embedded acquisition conditioning plate 3, the optical demodulator 2 and the direct current linear power module 13 are fixed at the upper reserved position in the embedded case 6 by bolts, the embedded acquisition conditioning plate 3 on which the photoelectric conversion module 5 is installed is fixed at the lower reserved position in the embedded case 6 by bolts, a direct current linear power module 13 output power lead 8 is connected to the embedded acquisition conditioning plate 3, an output signal wire and a power supply lead 18 of the optical demodulator 2 are connected to an interface of the embedded acquisition conditioning plate 3, and the optical demodulator 2 is powered by the embedded acquisition conditioning plate 3;
8) the embedded case is installed and wired in situ: the assembled embedded case 6 is arranged on a platform upright column near the lower part of a generator layer below the generator layer, the joint of a composite optical cable 10 is connected into an interface of an optical demodulator 2 in the embedded case 6, output leads of a key phase sensor 4 and a rotating speed sensor 12 are connected into a rotating speed testing interface of an embedded acquisition conditioning plate 3, and an optical port of a photoelectric conversion module 5 on the embedded acquisition conditioning plate 3 is connected with an Ethernet optical fiber to an operator station computer system 7;
9) installing a computer system of the embedded online monitoring device: the monitoring device computer system 7 is installed in an electric room of a power plant, an Ethernet optical fiber led out from the photoelectric conversion module 5 in the embedded case 6 is connected to a forward network gate 9 positioned in three areas of the power plant, an outlet optical fiber of the forward network gate 9 is connected to an optical port of the photoelectric conversion module 5 of the embedded online monitoring device computer system 7, and a network cable led out from an electric port of the photoelectric conversion module 5 is connected to a host of the embedded online monitoring device computer system 7.
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| CN202010601913.4A CN111682712B (en) | 2020-06-29 | 2020-06-29 | A field installation method of a large generator end vibration monitoring device |
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| CN111682712B true CN111682712B (en) | 2022-03-11 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1442683A (en) * | 2003-04-17 | 2003-09-17 | 上海交通大学 | Large power generator stator winding terminal part vibration on line monitoring method |
| CN102820725A (en) * | 2012-08-22 | 2012-12-12 | 哈尔滨电机厂有限责任公司 | Method for fixing end of stator winding of 1250MW nuclear-power half-speed turbine generator |
| EP2549245A1 (en) * | 2011-07-20 | 2013-01-23 | Siemens Aktiengesellschaft | Method and device for monitoring coil end oscillations of a generator |
| CN204064445U (en) * | 2014-08-06 | 2014-12-31 | 广东珠海金湾发电有限公司 | The mounting structure of a kind of optical fiber acceleration transducer in generator |
| CN106959158A (en) * | 2017-05-09 | 2017-07-18 | 国家电网公司 | A kind of pump-storage generator vibration monitoring method and monitoring system |
| CN207181588U (en) * | 2017-07-21 | 2018-04-03 | 江苏麟派电力科技股份有限公司 | A kind of portable electric generator stator winding end fiber-optic vibration monitors device on-line |
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2020
- 2020-06-29 CN CN202010601913.4A patent/CN111682712B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1442683A (en) * | 2003-04-17 | 2003-09-17 | 上海交通大学 | Large power generator stator winding terminal part vibration on line monitoring method |
| EP2549245A1 (en) * | 2011-07-20 | 2013-01-23 | Siemens Aktiengesellschaft | Method and device for monitoring coil end oscillations of a generator |
| CN102820725A (en) * | 2012-08-22 | 2012-12-12 | 哈尔滨电机厂有限责任公司 | Method for fixing end of stator winding of 1250MW nuclear-power half-speed turbine generator |
| CN204064445U (en) * | 2014-08-06 | 2014-12-31 | 广东珠海金湾发电有限公司 | The mounting structure of a kind of optical fiber acceleration transducer in generator |
| CN106959158A (en) * | 2017-05-09 | 2017-07-18 | 国家电网公司 | A kind of pump-storage generator vibration monitoring method and monitoring system |
| CN207181588U (en) * | 2017-07-21 | 2018-04-03 | 江苏麟派电力科技股份有限公司 | A kind of portable electric generator stator winding end fiber-optic vibration monitors device on-line |
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