KR101035497B1 - Method for total monitering on-line health of the generator - Google Patents

Abstract

PURPOSE: An on-line integrated method for monitoring the robustness of a generator is provided to previously detect the malfunction of the generator by monitoring the abnormalities related to the vibration of a stator end winding, the internal disconnection of a rotor, and the partial discharge of a stator. CONSTITUTION: Whether data signals are transmitted from four monitoring sensors(S30). The data signals are converted into plurals of event data required for a monitoring process(S40). If abnormalities are occurred in the monitoring sensors, different signals from the plurals of event data are converted into standard protocol signals based on a communication converter(S50).

Description

Method for Total Monitering On-line Health of the Generator

The present invention relates to a sound on-line integrated monitoring method of the generator, more specifically, the instantaneous discharge is made depending on whether there is an abnormality and at the same time monitoring the operation state of the generator safely and remotely without affecting the control system, The present invention relates to a method for integrated on-line monitoring of a generator's health so that the generator's health can also be monitored.

Recently, with the advancement of industrial development, as the unit capacity of generators increases, the control equipment that controls and monitors the power generation facilities becomes more advanced and advanced.

In the past, the monitoring / diagnosis technology of industrial facilities, which only depended on the ability and experience of the people in charge of industrial sites, developed rapidly according to the development of electronic and information technology, and developed various safety and scientific monitoring / diagnosis systems. It is widely used for scientific purposes as well as cost reduction purposes.

The generator's on-line monitoring system includes techniques for monitoring the generator's axial voltage / current, the generator's stator partial discharge, rotor interlayer short circuit and stator endwinding vibration. Firstly, the axial voltage / axial current of a generator refers to the generation of voltage / current on the rotating shaft of the generator by an induction magnetic field in the generator rotated by the rotation of the turbine. In addition, the stator partial discharge of the generator causes insulation deterioration due to thermal, electrical, mechanical and environmental complex deterioration as the generator is operated for a long time. Due to thermal deterioration, the bond strength between mica tapes is reduced, which causes voids in the epoxy-rich area, cracks and voids formed inside the mica tape due to electrical deterioration, and wear and mechanical stress caused by winding movement due to mechanical vibration. Insulation deterioration proceeds at the weak point of the slot exit, which causes partial discharge and generates high frequency current pulse. In addition, the interlayer short circuit of the generator is broken by insulation between the winding layers due to the effect of the rotor reaction of the generator rotor (the magnetic flux of the magnetic winding affects the magnetic flux of the field winding). Interlayer short circuits in the rotor windings cause unstable vibrations due to unbalance and asymmetrical heating of the magnetic flux. In addition, the stator terminal winding (Endwinding) vibration of the generator is most of the field winding short-circuit in the case of the field winding short-circuit affects the excitation system of the generator may generate abnormal mechanical vibration. Therefore, it is very important to quickly diagnose the occurrence of short circuits in the windings and their correct position in order to reduce economic losses and maintain the stability of the system. Initially, the method of diagnosing the vibration by mainly monitoring the vibration generated by the short circuit was used. However, since the causes of the generator vibration vary, accurate diagnosis is difficult. The main diagnostic methods currently proposed are the method of monitoring the change by indirectly measuring the impedance of the winding during operation, applying the AC current to the field winding, and checking the symmetry of the generated magnetic flux using the pickup coil, and picking up during operation. There are methods for measuring air-gap flux directly through the coil. Impedance measurement method can detect the short circuit accurately when the impedance changes significantly due to the intermittent short circuit, but it is difficult to detect the short circuit because there is no change in the continuous short circuit. The method of checking the symmetry of the magnetic flux according to the application of the AC current has a large economic loss because the diagnosis is performed while the generator is stopped. The method of directly detecting air-gap flux during operation has been evaluated as the most reliable method to date, but it has a disadvantage that it requires a lot of initial installation cost because a generator with a pickup coil of air-gap flux is still rare. In recent years, overseas technologies include a sensor technology for measuring the vibration period of a high-voltage rotor composed of electrical and mechanical stresses such as stators and end-windings using an optical fiber cable accelerometer. The sensor is nonconductive and is not affected by electromagnetic induction and interference. The sensor is designed for use in hazardous environments, such as high voltages, ambient temperatures above 90 degrees Celsius, and high hydrogen density in the atmosphere. Therefore, in the present invention, the sensor technology can be applied and improved and localized to monitor the vibration of the stator terminal winding of the generator.

On the other hand, looking at the technologies that have been patented by the applicant, according to the generator axial voltage / axial current online monitoring system of the Republic of Korea Patent Publication (B1) No. 10-0920895 (2009. 10.09), the turbine and the generator A generator shaft voltage / axial current on-line monitoring system in which a rotor rotates by a coupling for coupling, wherein the contact area with the rotating body is large in order to monitor the state of the shaft voltage / axial current stably on-line in real time. Using a special brush made of semi-permanent copper braid of wear resistance as a double sensor to detect the axial voltage / axial current of the generator, the axial current is detected through a low resistance classifier (Shunt) and ; Various events required for monitoring by comparing / analyzing the input value of the A / D converter which converted the axial voltage / axial current signal detected by the detection unit into a digital signal with the user setting parameter stored in the memory (SRAM) A PC-based DAQ unit for converting and controlling data and transmitting the result to a client system through a communication line; Various types of event data for monitoring and analysis transmitted from the PC-based DAQ unit, and various forms such as graphics, charts, and reports for estimating and analyzing the cause of generation of axial voltage / axial current of a generator corresponding to the various event data. A storage unit for storing user input application program (MMI) and server operation program, server and supervisory monitor for displaying and analyzing analyzed data in three-dimensional display, and A client system comprising an alarm for warning in stages according to analysis and a field indicator for receiving and monitoring the various event information in the field; And a discharge circuit unit which is switched by an input of the client system to manually discharge or bypass the storage voltage / store current or is automatically switched by a server of the client system to discharge or bypass. An on-line supervisory system is provided.

In addition, according to the on-line monitoring system for the partial discharge and interlayer short circuit of the high-pressure rotating device of Korean Patent Publication No. 10-0728762 (June 14, 2007), whether the partial discharge and the interlayer short circuit of the high-voltage rotating device occurred online A system for monitoring by means of: an interlayer short circuit detection sensor installed on the generator stator to detect whether there is an interlayer short circuit of the rotor winding; A partial discharge detection sensor installed on each side of the stator of the generator or on the output terminal side of the generator and the high voltage motor to detect whether the stator winding is partially discharged; First and second data collection devices for acquiring a detection signal detected from the interlayer short detection sensor and the partial discharge detection sensor through a coaxial cable and converting the detection signal into data for monitoring and analysis; And a server configured to collect and display the partial discharge and interlayer short circuit generation signals from the first and second data collection apparatuses through a communication line, and to transmit the signals to the outside. A signal controller for converting the shape and characteristics of the output signal so as to accurately analyze the weak output signal without distortion, and a preamplifier for amplifying the magnitude of the interlayer short signal converted from the signal controller and correcting the signal attenuation And an A / D converter for converting the interlayer short signal corrected from the preamplifier into digital data, a second CPU for totally controlling the internal functions of the second data collecting device, and the interlayer short signal analyzed through the devices. It includes a communication unit for transmitting to the outside using any one of the TCP / IP, RS-232 and RS-422 communication method There is an online monitoring system has been proposed as a high-pressure rotating device.

In addition to the above patented technologies, the method of monitoring partial discharge and interlayer short circuit of high-pressure rotating device of Korean Patent Publication No. 10-0728761 (June 14, 2007), No. 10-0763613 (October 04, 2007) Method for analyzing noise in partial discharge monitoring system of high voltage electric equipment of rotor no.10-0765449 (October 09, 2007), 10-0799704 (2008) 02. 01) Partial discharge monitoring sensor of high voltage equipment and its manufacturing method.

However, all of the technologies known to Korea and abroad and the above patented technologies proposed by the present applicants only partially monitor the generator, and are not a system for collectively monitoring the generator system. In spite of its importance and the need for monitoring / diagnosis, the development of integrated monitoring / diagnosis system has not been attempted at all due to safety concerns and lack of measurement technology. to be.

In other words, there is an urgent need for the development of a new integrated monitoring system that can remotely monitor the health of the generator, which is a high-voltage rotary generator, with a correlation between them. Short circuit faults in the rotor windings are on the rise. 2) In case of breakdown of generator insulation, it may cause power failure and performance deterioration due to accidental failure, short circuit of rotor, and long recovery period is required. 3) Vibration may occur due to damage of turbine and generator bearing due to generator shaft voltage. 4) Due to the improper fixation of key stator and stator core spacing of generator stator, fixed web plate and spring bar spacing, floating web plate inappropriateness and electric center mismatch, vibration and joint of stator endwinding This is because there is a possibility that it may affect axial voltage / axial current generation, stator partial discharge, rotor interlayer short circuit and stator terminal winding vibration.

Therefore, in order to solve the above-mentioned problems at the same time, the present invention is already registered in the patent by the present applicant and currently certified to NEP (New Excellent Product), the axial voltage / axial current, stator part that is being implemented alone in the generator of Dangjin Thermal Power Plant In addition to the discharge and interlayer short circuit monitoring monitoring technology, a vibration monitoring sensor that has been functionally applied and improved to suit the integrated monitoring method that can monitor vibrations of stator endwinding that has not yet been localized in addition to the applicant In addition, to provide an integrated monitoring method that can be collectively monitored at once, that is, the integrated on-line monitoring method of the soundness of the generator capable of remotely monitoring the generator of the high-voltage rotating equipment together with the generator health.

The present invention has been made to solve the above problems, the present invention relates to an integrated on-line monitoring method of the health of the generator, and more particularly generated by the induction magnetic field in the generator rotated by the rotation of the turbine The axial voltage / axial current of the generator and the sensor values that detect the stator partial discharge, rotor interlayer short circuit and stator endwinding vibration in the generator are acquired from the PC-based DAQ Unit and are monitored and analyzed by the algorithm. The MMI (Man Machine Interface) program and the instant discharge or By-Pass function can be safely and remotely managed by converting the required date to the upper monitoring server and displaying it in the form of event data such as graphs, charts and reports. At the same time, it monitors the operation status and discharges instantaneously according to the abnormality, and the soundness of the generator is also reduced. Soundness of the generator to be on-line for the purpose of providing integrated surveillance methods.

According to a feature of the present invention for achieving the above object, in the integrated on-line monitoring method of the generator of a high voltage rotating device, the first detection sensor for monitoring the axial voltage / axial current of the generator has a double structure Is installed on the rotating shaft of the generator in the form of a brush, the second detection sensor for monitoring the partial discharge of the stator winding of the generator is the contact type (EMC) of the generator output terminal / non-contact (SSC) of the slot of the stator Respectively installed in the generator, and a third detection sensor for monitoring the interlayer short circuit of the rotor winding of the generator and a fourth detection sensor for monitoring the vibration of the stator terminal winding of the generator are installed in the stator slots of the generator, respectively. A first step of detecting the presence of an abnormality; A second step of connecting and connecting the first through fourth DAQ units and the first through fourth DAQ units, which are based on PCs, to the various types of event data for monitoring; In the second step, the PC-based first DAQ unit to the fourth DAQ unit is a third step of confirming the existence of a data signal detected from the first to fourth sensing sensors in a period of 1 ~ 10sec; In the third step, if a data signal is present, the data signal is converted into a digital signal, and compared with the algorithm (or user setting parameter) stored in memory for each PC-based DAQ unit. Performing a fourth step; In the fourth step, when there is an abnormality in one or more detection sensors of the first step, a standard protocol signal through a communication converter to transmit different signals of the plurality of event data generated in the fourth step to the central control room A fifth step of converting and controlling the conversion into a second channel; In the fifth step, a sixth step of estimating and analyzing a cause of a failure by using various user input application programs (MMIs) and server operation programs which are necessary for monitoring transmitted to the central control room; A seventh step of integrating and displaying the analyzed data in three dimensions through a server and a monitoring monitor, and displaying and analyzing the data step by step through a signal / alarm according to the analyzed data value and transmitting the result to a field watch; After the sixth step, the PC-based first to fourth DAQ unit and the fourth DAQ unit and the server automatically switches the switch of the discharge circuit unit to instantaneously discharge or bypass the axial current and the short circuit current, and continuously monitor for a set time. An eighth step of causing it to occur; After the seventh step, the monitor includes an ninth step of manually discharging or bypassing the axial current and the short-circuit current by operating the switch of the discharge circuit unit through the input of the central control room to eliminate the cause of the failure. The user setting parameter of the 4th step and the reference value of the signal / alarm of the 7th step are synchronized with the memory through the system synchronization interface (SSI) bus and the software of the PC-based 1st to 4th DAQ units to obtain the reference value. The user setting parameter and the signal / alarm may be calibrated, and the user setting parameter and the signal / alarm may be converted to control the signals detected from the first to fourth detection sensors into various event data for monitoring and analysis. Integrity of the generator, characterized in that for setting the reference value of the memory in advance and store it It provides integrated monitoring methods.

Preferably, the event data of the fourth step may include brush failure and brush contact failure, ground system failure, bearing insulation failure, shaft and bearing generated in the generator according to the detection values of the first to fourth detection sensors. Axial voltage / axial current, partial discharge, interlayer short circuit, terminal due to friction, winding and core abnormality, exciter abnormality, electrostatic voltage generation by bearing seal arcing and wet steam, and deterioration and insulation breakdown caused by long time operation and stress of generator Characterized in that the cause of the failure due to the winding vibration.

According to the sound on-line integrated monitoring method of the generator of the present invention, the following effects.

(1) Abnormality of axial voltage / axial current of generator which is a high voltage rotating device, partial discharge of stator, interlayer short circuit of rotor and vibration of stator end winding, By real-time integrated monitoring, it is possible to proactively monitor the possibility of failure of a generator using a high-voltage rotating device.

(2) As it can remotely monitor the generator operation status of high-voltage rotary equipment and monitor the soundness at the same time, it can contribute to the stable operation of power generation facilities by securing the reliability of the generator.

(3) Generator's sound on-line integrated monitoring prevents the generator from shutting down due to a sudden failure of the generator, and has the unique effect of procuring predictive maintenance data on important parts of the generator in advance. .

Figure 1 is a schematic diagram showing a health on-line integrated monitoring system of the generator according to a preferred embodiment of the present invention
Figure 2 is a block diagram showing the overall configuration of a sound on-line integrated monitoring system of a generator according to a preferred embodiment of the present invention
FIG. 3 is a schematic diagram of a first to fourth detection sensors, a PC-based first DAQ unit to a fourth DAQ unit, and a discharge circuit unit of an on-line integrated monitoring system for a generator according to a preferred embodiment of the present invention. Diagram
FIG. 4 is a block diagram illustrating a discharge or by-pass function through the first to fourth sensors and the PC-based first to fourth data acquisition units and servers according to FIG. 3.
Figure 5 is a flow chart showing a method for monitoring the integrated health on-line of the generator according to a preferred embodiment of the present invention
6 is a graphic and a physical picture for monitoring the storage voltage / storage current of the integrated on-line monitoring system of the generator according to a preferred embodiment of the present invention
7 is a graphic and physical picture for monitoring the partial discharge and interlayer short circuit of the integrated on-line monitoring system of the generator according to a preferred embodiment of the present invention
8 is a graphic and physical picture for monitoring the endwinding damage and vibration of the integrated on-line monitoring system of the generator according to a preferred embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. The prior art should be interpreted as such. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 to 4, the health on-line integrated monitoring system configuration of a generator according to a preferred embodiment of the present invention will be described in detail.

The core technical configuration for implementing the on-line integrated monitoring system of the generator of the present invention is a sensor 100, a signal processor 200, a PC-based DAQ unit 300, a communication converter 400, a communication line ( 500), the central control room 600, the discharge circuit unit 700 and the field indicator 800.

First, referring to FIGS. 1 to 3, the detection sensor 100 includes a first detection sensor 110 to a fourth detection sensor 140.

The first detection sensor 110 is a means for monitoring the shaft voltage / shaft current of the generator is installed on the rotating shaft 10 of the generator using a special brush of the double structure made of copper braid (Copper Braid) of the shaft of the generator A signal capable of detecting whether a voltage / axis current is generated is detected. (Code 110 of FIG. 6: Refer to a real picture).

The second sensor 120 is a means for monitoring the partial discharge of the stator winding of the generator (isolated state) is installed in the stator 20 of the generator to detect a signal that can monitor whether or not the partial discharge of the stator winding (Fig. Reference numeral 120 in Fig. 7 refers to the real photograph).

Wherein the second detection sensor is a contact type (Epoxy Mica Coupler: EMC) is installed in the output terminal of the generator and the non-contact type (Stator Slot Coupler: SSC) uses a discharge sensor is installed in the stator slot (Slot).

The third sensor 130 is a means for monitoring the interlayer short circuit of the rotor windings of the generator, it is installed in the stator 20 slot of the generator detects a signal that can monitor whether the interlayer short circuit of the rotor windings (Fig. Reference numeral 130 in Fig. 7 shows a real picture).

The fourth detection sensor 140 is a means for monitoring the vibration of the stator terminal winding (Endwinding) of the generator, it is installed on the stator 30 bar (Bar) of the generator can be whether or not the vibration of the stator terminal winding (Endwinding) A signal is detected (reference numeral 140 in FIG. 8: see a real picture).

The signal processor 200 preempts input values of the A / D converter 210 and the A / D converter 210 for converting the analog signals detected from the first to fourth sensing sensors into digital signals. A buffer 220 is elected (FIFO).

1 to 3, the PC-based DAQ unit 300, the signal for sequentially converting the analog signal detected from the first sensor 110 to the fourth sensor 140 to a digital signal The data collected through the processor 200 is compared and analyzed with an algorithm (user setting parameter) stored in the memory 350 and converted into various event data for monitoring.

In addition, the PC-based first DAQ unit 310 to the fourth DAQ unit 340 collects data detection values of the first detection sensor 110 to the fourth detection sensor 140 in units of 1 to 10 sec. And conversion control to various event data.

Here, the various event data includes brush defects and brush contact defects occurring in turbines and generators according to the detection values of the first to fourth sensors, faulty grounding systems, bearing insulation defects, shaft and bearing friction, winding and cores. Abnormality, excitation phase, occurrence of electrostatic voltage caused by bearing seal arcing and wet steam and failure of generator for long time and deterioration due to stress and insulation breakdown, axial voltage / axial current, partial discharge, interlayer short circuit, terminal winding vibration, etc. Include what is the cause.

In addition, the PC-based first DAQ unit 310 to the fourth DAQ unit 340 may synchronize and calibrate between the memory (SRAM) 350 cards through a system synchronization interface (SSI) bus. The designed software is provided so that it can be calibrated very easily. According to the present invention, the signal of the first to fourth detection sensors 110 to 140 can be converted into various event data for monitoring and analysis. In order to store the user setting parameter (Parameter) and the reference value of the signal / alarm in the memory 350 is configured.

In other words, the reference values of the user setting parameter and the signal / alarm 630 correspond to the operation function of the first to fourth sensing sensors 140 and 140 and the detected signal value. It is further included to be preset and stored in the memory unit 350 that can be synchronized with and calibrated with the first to fourth DAQ units 310 to 340.

The CPU of the PC-based first DAQ unit 310 to the fourth DAQ unit 340 according to the embodiment of the present invention may have a multi-function and expand through a slot.

Referring to FIG. 2, the communication converter 400 converts and controls different signals inputted from the PC-based first to fourth DAQ units into standard protocol signals to control a communication line (TCP / IP) 500. It is a device for transmitting to the central control room 600 through.

Here, the communication converter 400 is a modern industrial equipment is connected to the network, the trend is to monitor and control a lot of information from the central device, the adoption of a standardization protocol is essential to easily connect the devices of this type. Standardized protocols can be easily implemented by applying industrial communication protocol converters without spending a lot of money to implement standardization protocols. Industrial communication protocol converters are the standard protocols currently used in power and automation systems such as DNP3.0, Modbus, Lonworks is embedded and can be mounted on devices that do not have a standard protocol to connect to a standardized network.

Referring to FIG. 2, the communication line 500 centralizes various event data for analysis detected and processed by the first to fourth sensing sensors 140 through the communication converter 400. An Internet Protocol Suite for transmitting information data to the server 610 of the control room 600. In the present invention, a TCP / IP (Transmission Control Protocol / Internet Protocol) communication method is used in the Internet protocol suite, which is a communication protocol (protocol) used by computers to exchange information with each other on the Internet. In addition, the PC-based first DAQ unit 310 to the fourth DAQ unit 340 and the communication converter 400 transmits data using a RS-422 (Recommended Standard-422) communication method.

Referring to FIG. 2, the central monitoring room 600 may be configured in various forms such as graphs, charts, and reports in order to estimate and analyze the occurrence of various event data required for the monitoring transmitted from the communication converter 400. A storage unit 650 for storing a user input application program (Man Machine Interface (MMI)) and a server operation program for displaying, a server 610 and a supervisory monitor 620 for three-dimensionally displaying and controlling the analyzed data on the monitor. ), And a signal / alarm 630 for displaying and warning step by step according to the analysis data value.

Although not shown in the drawing, the server 610 may include an analysis control unit that may analyze various event data for monitoring the detection values of the first detection sensor 110 to the fourth detection sensor 140 ( Not shown) is further included. In addition, the server 610 is configured to further include a field indicator 800 for transmitting the analyzed data through the hub 810 in order to receive and monitor the Internet user 820 and the head office manager 830, Lose.

1, 3, and 4, the discharge circuit unit 700 is switched by an input unit 640 of the central control room 600 to manually discharge or bypass the axial current and the short circuit current. It is configured to be automatically switched by the server 610 and the PC-based first DAQ unit 310 to the fourth DAQ unit 340 to enable discharge or bypass.

Here, the discharge circuit unit 700 is composed of a switch 710 and the RC parallel circuit 720, the first detection sensor 110 to the fourth detection sensor 140 and the PC-based first DAQ unit 310 ) Is configured as the number of the fourth DAQ unit 340 is switched manually or automatically by the input unit 640 and the server 610, the capacitor C1 according to the elapse of time constant (τ) of the RC parallel circuit 720 ), The axial current and the short-circuit current charged in FIG. 1 are instantaneously discharged or bypassed to the ground along the resistor R2 (see FIG. 4).

Hereinafter, with reference to the above-described system and Figure 5, it will be described in detail a health on-line integrated monitoring method of a generator according to a preferred embodiment of the present invention.

According to an embodiment of the present invention, the signal value input through various sensors can be digitized and can be monitored in real time in real time through integrated monitoring such as a monitoring monitor and an on-site indicator by operating at a high speed in a client system using a standardized protocol. To provide an integrated on-line monitoring method for sound generators.

First, the first detection sensor 110 for monitoring the axial voltage / axial current of the generator is installed on the rotating shaft of the generator in the form of a brush of the double structure, the second detection for monitoring whether the partial discharge of the stator winding of the generator The sensor 120 is installed in the output terminal of the generator (EMC) / non-contact (SSC) in the slot of the stator, respectively, and the third detection sensor for monitoring the interlayer short circuit of the rotor winding of the generator ( 130 and the fourth detection sensor 140 for monitoring the vibration of the stator terminal winding of the generator has a first step (S10) installed in the stator slot (slot) of the generator to detect the abnormality.

The PC-based first DAQ unit 310 to the fourth DAQ unit 340 converting and controlling the first detection sensor 110 to the fourth detection sensor 140 and various event data necessary for monitoring in a 1: 1 ratio. And a second step S20 for connecting and connecting each.

In the second step, the PC-based first DAQ unit 310 to the fourth DAQ unit 340 checks the presence or absence of a data signal detected from the first to fourth sensing sensors at intervals of 1 to 10 sec. It has a third step (S30) to do.

In the third step, if a data signal is present, it converts and processes the digital signal, compares, analyzes and judges the algorithm (or user setting parameter) stored in the memory 350 for each PC-based DAQ unit to determine various events required for monitoring. A fourth step S40 of converting the data is provided.

Here, the various event data of the fourth step, the brush failure and brush contact failure generated in the generator according to the detection value of the first sensor to the fourth sensor, ground system abnormality, bearing insulation failure, shaft and bearing friction , Axial voltage / axial current, partial discharge, interlayer short circuit, terminal winding due to winding and core abnormality, exciter abnormality, electrostatic voltage generation by bearing seal arcing and wet steam and deterioration and insulation breakdown caused by long time operation and stress of generator It includes what is causing the failure such as vibration.

In the fourth step, if there is an abnormality in one or more detection sensors of the first step, the communication converter 400 to transmit different signals of the plurality of event data generated in the fourth step to the central control room 600 A fifth step S50 of controlling the conversion into the standard protocol signal is performed.

In the fifth step, various event data required for monitoring transmitted to the central control room may include the sixth step S60 of estimating and analyzing the cause of the failure through a preset user input application program (MMI) and a server operation program. Have

The seventh step of displaying the analyzed data in three-dimensionally integrated through the server 610 and the monitoring monitor 620, step by step display and warning according to the data value analyzed through the signal / alarm 630 and transmits to the field clock (S70).

After the sixth step, the switch 710 of the discharge circuit unit 700 is automatically switched by the PC-based first to fourth DAQ units and the server to instantaneously discharge or bypass the axial current and the short circuit current. An eighth step S80 for continuously monitoring for a set time; After the seventh step, the ninth step of eliminating the cause of the failure of the monitor manually discharging or bypassing the axial current and the short-circuit current by operating the switch 710 of the discharge circuit unit 700 through the input unit 640 of the central control room. It characterized in that it comprises a step (S90).

In addition, in an embodiment according to the method of the present invention, the reference value of the user setting parameter of the fourth step and the signal / alarm 630 of the seventh step may include the PC-based first DAQ units 310 to fourth DAQ. The reference value may be calibrated by being synchronized with a memory through a system synchronization interface (SSI) bus and software of the unit 340, and may be detected from the first to fourth sensing sensors 140 to 140. And setting and storing the user setting parameter and the reference value of the signal / alarm in the memory 350 in advance so as to control the signal into various event data necessary for monitoring and analysis.

Meanwhile, referring to FIG. 6, a graph of a real-time monitoring result of the axial voltage / axial current of the generator by the first detection sensor 110 according to the embodiment of the present invention is displayed on the integrated monitoring monitor 620. It is shown in various forms, such as a chart. That is, ① indicates time / analysis / alarm window movement button, ② indicates real time monitoring value, ③ indicates time trend graph, ④ indicates daily trend graph, ⑤ indicates communication status LED, and ⑥ indicates alarm status LED. It is easy to identify the fault section and take quick action. It also shows a real-life sensor that monitors the axial voltage / axial current mounted on the generator of the high-voltage rotor.

In addition, referring to FIG. 7, the partial discharge of the stator windings of the generator and the interlayer short circuit of the rotor windings by the second and third sensing sensors 120 and 130 according to an exemplary embodiment of the present invention. It shows various monitoring types such as graphs, charts, waveforms, etc. and real pictures of sensors that are installed in generators of high-voltage rotors.

Referring to FIG. 8, various monitoring types such as graphs, charts, waveforms, and the like of a vibration state of a stator terminal winding due to electrical and mechanical stress of the generator by the fourth detection sensor 140 according to an embodiment of the present invention. It also shows a real picture with a sensor for monitoring the vibration of the stator terminal winding of the generator, which has been applied and improved by the present applicant to the integrated monitoring system.

Referring to Figures 1 to 8, the overall operation of the integrated on-line monitoring method of the health of the generator according to a preferred embodiment of the present invention will be described as follows.

According to an embodiment of the present invention, a variety of sensors (generator axial voltage / axial current detection sensor 110, stator partial discharge detection sensor 120, rotor interlayer short circuit detection sensor 130, stator terminal winding vibration detection at the output terminal of the generator The sensor 140 is installed to detect at set time intervals (1 to 10 sec) and the detected analog signal values are sequentially converted to digital signal values, and then data is detected from the sensors 110 to 130. Acquiring data from a plurality of PC-based DAQ units 310 to 340, which are collecting devices, and converting the data into event data for monitoring and analysis by an algorithm (user setting parameter); The conversion-controlled event data is transmitted to the upper server 610 of the central control room 600 via the TCP / IP communication line 500 through the communication converter 400 having the standardized protocol signal. In addition, the server 610 includes a step of constructing an MMI (Man Machine Interface) program for displaying data received from a plurality of PC-based DAQ Units 310 to 340 in various forms such as various graphs, charts, and reports. The central control room workers and site users can easily monitor and analyze from the remote, and also through the discharge circuit unit to instantaneous discharge or By-Pass according to the abnormality, and through the field indicator 800 connected to the server In addition, it may be configured to further include steps to enable monitoring and analysis.

In this way, the integrated on-line monitoring method of the generator of the present invention can monitor the operational status of the generator using the high-voltage rotating device remotely and at the same time, as well as the soundness, so that it can contribute to the stable operation of the generator. Have

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: shaft 20, 30: stator
100: detection sensor 110: first detection sensor
120: second detection sensor 130: third detection sensor
140: fourth detection sensor 200: signal processor
210: A / D converter 220: buffer (FIFO)
300: PC-based DAQ Unit 310: PC-based 1 DAQ Unit
320: PC-based second DAQ Unit 330: PC-based third DAQ Unit
340: PC-based 4th DAQ Unit 350: Memory (SRAM)
400: communication converter 500: communication line (TCP / IP)
600: central control room 610: server (integrated S / W building)
620: supervision monitor 630: 4 signals / alarms
640: input unit 650: storage unit
700: discharge circuit portion 710: 4 S / WR
720: 4 RC parallel circuits 800: field indicator
810: Hub Unit 820: Internet User
830: Head Office Manager

Claims (3)

In the integrated on-line monitoring method of the generator of a high-voltage rotating device,
The first detection sensor for monitoring the axial voltage / axial current of the generator is installed in the rotary shaft of the generator in the form of a brush of the double structure, the second detection sensor for monitoring the partial discharge of the stator winding of the generator is a contact type ( EMC) In case of generator output terminal / non-contact (SSC), it is installed in the slot of stator respectively, and the third sensing sensor for monitoring the interlayer short circuit of rotor winding of generator and vibration of stator terminal winding of generator The fourth detection sensor for monitoring whether the first step is installed in each of the stator slot (slot) of the generator for detecting the presence or absence;
A second step of connecting and connecting the first through fourth DAQ units and the first through fourth DAQ units, which are based on PCs, to the various types of event data for monitoring;
In the second step, the PC-based first DAQ unit to the fourth DAQ unit is a third step of confirming the existence of a data signal detected from the first to fourth sensing sensors in a period of 1 ~ 10sec;
In the third step, if a data signal is present, the data signal is converted into a digital signal, and compared with the algorithm (or user setting parameter) stored in memory for each PC-based DAQ unit. Performing a fourth step;
In the fourth step, when there is an abnormality in one or more detection sensors of the first step, a standard protocol signal through a communication converter to transmit different signals of the plurality of event data generated in the fourth step to the central control room A fifth step of converting and controlling the conversion into a second channel;
In the fifth step, a sixth step of estimating and analyzing a cause of a failure by using various user input application programs (MMIs) and server operation programs which are necessary for monitoring transmitted to the central control room;
A seventh step of integrating and displaying the analyzed data in three dimensions through a server and a monitoring monitor, and displaying and analyzing the data step by step through a signal / alarm according to the analyzed data value and transmitting the result to a field watch;
After the sixth step, the switches of the discharge circuit unit are automatically switched by the PC-based first to fourth DAQ units and the server and the server instantaneously discharges or bypasses the axial current and the short-circuit current and continuously monitors for a set time. An eighth step to ensure that;
After the seventh step, the monitor includes an ninth step of manually discharging or bypassing the axial current and the short-circuit current by operating the switch of the discharge circuit unit through the input of the central control room to eliminate the cause of the failure,
Further, the user setting parameter of the fourth step and the reference value of the signal / alarm of the seventh step are synchronized with the memory through the SSI (System Synchronization Interface) bus of the PC-based first to fourth DAQ units and software. The reference value may be calibrated, and the user setting parameter may be used to convert and control the signal detected from the first to fourth detection sensors into various event data for monitoring and analysis. And a reference value of a signal / alarm set in advance in the memory and stored.
The method according to claim 1,
The event data of the fourth stage may include brush defects and brush contact defects, ground system abnormalities, bearing insulation defects, shaft and bearing friction, windings, and the like, which are generated in the generator according to the detection values of the first to fourth sensors. Core failure, excitation failure, whether the static voltage is generated by bearing seal arcing or wet steam, and the generator's long-term operation and stress caused by axial voltage / axial current, partial discharge, interlayer short circuit, terminal winding vibration Integrated on-line monitoring method of the generator, characterized in that the cause of the failure.
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