WO2000010018A2 - Method for the surveillance and automatic digital recording of electrical systems perturbations - Google Patents
Method for the surveillance and automatic digital recording of electrical systems perturbations Download PDFInfo
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- WO2000010018A2 WO2000010018A2 PCT/RO1999/000004 RO9900004W WO0010018A2 WO 2000010018 A2 WO2000010018 A2 WO 2000010018A2 RO 9900004 W RO9900004 W RO 9900004W WO 0010018 A2 WO0010018 A2 WO 0010018A2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
Definitions
- the present invention describes a method for the surveillance and automatic digital recording of perturbations occurring during electrical systems operation. They offer complete, immediate information to the staff assigned to maintain, analyze and make decisions with regard to the systems for protection and automation of electrical systems.
- relay protection devices including several components - specialized relays - for damage recording, completed by singular recording devices on various parameters: shock currents, excess currents, overvoltage, zero drops, etc.
- the staff will interpret the results in order to determine the causes and take the necessary measures.
- These procedures are disadvantaged by the absence of complete simultaneous data on the electrical system status before the occurrence of perturbations, and especially their evolution from normal values to the values during perturbation occurrence and after, to the values of post-perturbation stabilization.
- the classical devices for recording the perturbations occurring within electrical systems are based on the comparison method between the analyzed variable and the reference variable on the basis of the "release threshold". Thus, the device is set at the limit value of the variable to be measured, to which the measured variable obtained in the process.
- This comparison method between the measured variable and the minimal or maximal reference variable is the basic principle underlying the recording and analysis of electrical systems perturbations by classical devices.
- the method and system for determining and reducing transient oscillations that occur with resonance in electric power transmission systems handles only a specific perturbation case in the operation of electrical systems and therefore does not solve the problem of surveying and recording any kind of perturbations that occur, for many other reasons, within complex interconnected electrical systems. These perturbations need to be analysed in detail and the causes of their occurrence need to be established in order to reduce their frequency.
- the method for surveillance and automatic digital recording of perturbations occurring during electrical systems operation provides the data necessary to post-event analysis.
- the analogical and/or digital signals that define at each moment the operation of the electrical system under surveillance are taken over simultaneously and with adjustable frequency through radial circuits made up of a number of transducers, interface devices for data collection and signal conditioning, acquisition modules, communication interfaces consisting in normal surveillance inputs and/or special inputs with trigger for reading the data taken over, stored and protected against tension drops in the supply circuits, into a circular buffer whose size varies according to the number of channels and the reading frequency.
- the taking over process occurs in two stages; in the first stage - pre-event - the permanent data are collected and stored in a memory area that will be rewritten at each new scanning cycle, representing a reference set of measures for the post- damage analysis, while the second stage records the perturbation in the operation of the electrical system throughout the occurrence of the unpredictable but effective event, having saved the data before joining the pre-event set of data for a variable time set by the user.
- the transit from the first stage of recording pre-event permanent data on the surveyed electrical system, to the second stage of recording the perturbations is automatical, because the occurrence of perturbations in the operation of the electrical system under surveillance is perceived.
- the perturbations cause oscillations from the normal analogical or digital variables stored during the previous interval, taken as reference.
- Figure 1 The logical diagram of the method for surveillance and automatic digital recording of perturbation occurring during electrical systems operation
- Figure 2 The block diagram of the system for surveillance and automatic digital recording of perturbation occurring during electrical systems operation
- Figure 7 Diagram block of the system given as example of the method described above
- the system for surveillance and automatic digital recording of perturbation occurring during electrical systems operation is made up of the acquisition block for process data (1 ), the protection-filtering module (2), the trigger acquisition module (3), PC process computer (4) and the man-machine interface GUI [graphic user interface] (5).
- the acquisition block (1 ) performs the acquisition of functioning data of the electrical system under surveillance, through analogical signals Ut ( ) and/or It ( , digital signals DIt (-T ) and counter/trigger signals.
- the analogical acquisition plates 1 A enable the acquisition of technological signals Ut ( ) and/or It ( «-) with variable sampling speed, ranging, for example, from 1000 to 10 000 points/second, the selection of a certain value being determined by the number of acquired signals.
- amplification is provided by an amplifier I B, the amplifying factors ranging from 1 to 100, adjustable so as to obtain signal values that allow comparison of behaviour.
- the digital acquisition plates 1 C enable the acquisition of digital technological signals DIt (-J1-) in the process.
- the sampling speed varies and is obviously determined by the number of signs acquired during the time unit, which may vary between two limit values, such as 1 and 10 points/second.
- the protection-filter module (2) ensures the protection and galvanic isolation of the input variables (transducers and field signals), taken over through the process data acquisition block (1 ), and the trigger acquisition module (3).
- the protection-filtering module (2) performs filtering operations through the filters 2A, signal limitation and galvanic isolation of the acquisition channels through the channel accumulators 2B.
- the trigger acquisition module (3) performs acquisition, processing and analogical multiplexing operations of the signals taken over from the protection-filtering module (2).
- the trigger acquisition module (3) has the following complex functions:
- the values of the analogical variables Ut (* ⁇ ) and/or It ( ⁇ and of the digital variable DIt (-H-) acquired, taken over from the protection- filtering module (2), are multiplexed and amplified in specialized circuits 3A and 3B and stored in a memory circular buffer 3C whose size corresponds to the total number of acquired signals.
- the Ut ( ) is multiplexed and amplified in specialized circuits 3A and 3B and stored in a memory circular buffer 3C whose size corresponds to the total number of acquired signals.
- the analogical values acquired at t and t- 1 have fewer common points than the value of the comparison factor (for a sampling speed of 1000 points/second the comparison factor is, for example, 900, so the values acquired at t and t- 1 have less than 900 common points), a perturbation is considered to have occurred at moment t and the analogical trigger 3E is also released for recording the wave form on RAM and HDD support and displaying it on monitor (4) through the graphic user interface GUI (5).
- the modification of the signal value at moment t as compared with the value stored in buffer 3 C at t- 1 causes the digital trigger 3E release and the recording of the phenomena in the same way as the analogical signals.
- the system and the method also allow recording of events coming from an external trigger 3G which may be part of parallel equipment or may be released by an operator.
- Process computer (4) has an analysis and comparison software and can perform the following: - data storage in RAM memory;
- the man-machine interface GUI (5) provides the graphic display and therefore allows visualisation of the perturbation events that made necessary the entire system for surveillance and automatic digital recording of perturbations that occur during electrical systems operation.
- the method for surveillance and automatic digital recording of perturbations that may occur during electrical systems operation provides that the analogical and/or digital signals that define at each moment the operation of the electrical system under surveillance should be taken over simultaneously and with adjustable frequency by the radial circuits made up of several transducers 1 A, interface devices for data collection and signal conditioning I B, acquisition modules and communication interfaces (2) consisting in normal surveillance inputs and/or special inputs with trigger for reading the data taken over, stored into a circular buffer 3C in two stages; in the first stage - pre-event - the permanent data are collected and stored in a memory area that will be rewritten at each new scanning cycle, representing a reference set of measures for the post- damage analysis, while the second stage records the perturbation in the operation of the electrical system throughout the occurrence of the unpredictable but effective event, having saved the data before joining the pre-
- the acquisition module that performs the simultaneous acquisition of binary and analogical variables, on the basis of an iterative cycling method that allows the reading of all variables with configurable frequency; release module, through which the variables obtained are compared with their values during the previous period of time; on the basis of a chosen proportionality-comparison factor, the recording of the perturbation event starts automatically;
- the communication module that accomplishes, automatically or upon request, the simultaneous portability of data, of the entire useful information respectively, through an optical fibers network towards a monitoring station within a central computer that surveys the electrical system, or other UNIX or Macintosh operation systems, without affecting the possibility of activities in real time or interrupting the data acquisition and the recording of perturbations.
- the transit from the first stage of recording pre-event permanent data on the surveyed electrical system, to the second stage of recording the perturbations is automatical, because the occurrence of perturbations in the operation of the electrical system under surveillance is perceived.
- the perturbations cause oscillations from the normal analogical or digital variables stored during the first stage or activate the existing electrical and/or technological protection devices in the system that operate according to the "OR" logic of event recording when the reference state, the analogical or binary signals suffer modifications, or by release of a software trigger signal by the application software, that can prolong the duration of data recording accordingly, treating them in the same way as normal signals, or manually, by an external device, such as a hardware trigger.
- Read data are stored in a circular buffer 3C whose size varies according to number of channels and the reading frequency, and are protected by a back-up system against tension drops in the supply circuits.
- the system for surveillance and automatic recording of perturbations that may occur during electrical system operation is provided with two operation modes, of which one is the normal operation mode where the system is waiting to detect a perturbation in the electrical system under surveillance, and a the other a user configuration mode necessary for programming the important parameters such as the acquisition speed, memory allotment, etc. and for activating the auto-tests.
- Both operation modes are accessible locally, through a keyboard that may be attached or the connection of a PC portable computer, or at a distance through a network or modem.
- Patent W0 94 / 0721 1 (PCT / SE93 / 00747)
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- Power Engineering (AREA)
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- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
The method for surveillance and automatic digital recording of perturbations that may occur during electrical systems operation is characterized by the fact that the analogical and/or digital signals that define at each moment the operation of the electrical system under surveillance are taken over simultaneously and with adjustable frequency stored into a circular buffer (3C) in two stages; in the first stage - pre-event - the permanent data are collected and stored in a memory area that will be rewritten at each new scanning cycle, representing a reference set of measures for the post-damage analysis, while the second stage records the perturbation in the operation of the electrical system throughout the occurrence of the unpredictable but effective event, having saved the data before joining the pre-event set of data for a variable time set by the user. The transit from the first stage of recording pre-event permanent data on the surveyed electrical system, to the second stage of recording the perturbations is automatical, because the occurrence of perturbations in the operation of the electrical system under surveillance is perceived. The perturbations cause oscillations from the normal analogical or digital variables stored during the first stage or activate the existing electrical and/or technological protection devices in the system that operate according to the 'OR' logic of event recording when the reference state, the analogical or binary signals suffer modifications, or by release of a software trigger signal by the application software, that can prolong the duration of data recording accordingly, treating them in the same way as normal signals, or manually, by an external device, such as a hardware trigger. All these can also activate the various devices generally included in the protection and signalling circuits of the electrical systems, such as horns, flashing lamps etc.
Description
METHOD FOR THE SURVEILLANCE AND AUTOMATIC DIGITAL RECORDING OF ELECTRICAL SYSTEMS PERTURBATIONS
Technical Field
The present invention describes a method for the surveillance and automatic digital recording of perturbations occurring during electrical systems operation. They offer complete, immediate information to the staff assigned to maintain, analyze and make decisions with regard to the systems for protection and automation of electrical systems.
Background Art
There are several methods for recording events occurring within electrical systems. Among these, we mention here the relay protection devices, including several components - specialized relays - for damage recording, completed by singular recording devices on various parameters: shock currents, excess currents, overvoltage, zero drops, etc. On the basis of the data recorded, the staff will interpret the results in order to determine the causes and take the necessary measures. These procedures are disadvantaged by the absence of complete simultaneous data on the electrical system status before the occurrence of perturbations, and especially their evolution from normal values to the values during perturbation occurrence and after, to the values of post-perturbation stabilization.
There are also recording devices placed in various places within the
electrical systems for short-term tape recording of various parameters variation. These parameters will have modified values corresponding to events imposed on the electrical system in order to check the protection systems reaction or determine the capacity of certain devices within the primary circuits to support charges during perturbation events, or to adjust the action values of relay protection. The classical devices for recording the perturbations occurring within electrical systems are based on the comparison method between the analyzed variable and the reference variable on the basis of the "release threshold". Thus, the device is set at the limit value of the variable to be measured, to which the measured variable obtained in the process. This comparison method between the measured variable and the minimal or maximal reference variable is the basic principle underlying the recording and analysis of electrical systems perturbations by classical devices. These methods and devices are greatly disadvantaged by the fact that they only record events induced in the electrical system during tests, therefore for limited periods of time, being removed from the circuits the various programmed requirements of the electrical systems have been experimented. Moreover, their operation is conditioned by setting the "release threshold" value, which leads to the exemption from the analysis of all events resulting in values below this release threshold. Such events are frequent causes of serious damages within electrical systems.
There is another method and system for determining and reducing transient oscillations that occur with resonance in electric power transmission systems, as described in Patent WO94 / 0721 1 (PCT / SE93/ 00747). It measures the amplitude and phase of the various harmonic waves in order to reduce them by certain procedures. The
method describes a specific system for taking over the harmonic signals on tension and current, their processing in order to define, in amplitude and angle according to the coordinates, a measurement vector for each harmonic wave, which, once amplified, is able to command the harmonic waves reduction system. The method and system for determining and reducing transient oscillations that occur with resonance in electric power transmission systems handles only a specific perturbation case in the operation of electrical systems and therefore does not solve the problem of surveying and recording any kind of perturbations that occur, for many other reasons, within complex interconnected electrical systems. These perturbations need to be analysed in detail and the causes of their occurrence need to be established in order to reduce their frequency.
Disclosure of Invention
The method for surveillance and automatic digital recording of perturbations occurring during electrical systems operation, according to the invention, provides the data necessary to post-event analysis. The analogical and/or digital signals that define at each moment the operation of the electrical system under surveillance are taken over simultaneously and with adjustable frequency through radial circuits made up of a number of transducers, interface devices for data collection and signal conditioning, acquisition modules, communication interfaces consisting in normal surveillance inputs and/or special inputs with trigger for reading the data taken over, stored and protected against tension drops in the supply circuits, into a circular buffer whose size varies according to the number of channels and the reading frequency. The taking over process occurs in two
stages; in the first stage - pre-event - the permanent data are collected and stored in a memory area that will be rewritten at each new scanning cycle, representing a reference set of measures for the post- damage analysis, while the second stage records the perturbation in the operation of the electrical system throughout the occurrence of the unpredictable but effective event, having saved the data before joining the pre-event set of data for a variable time set by the user.
The transit from the first stage of recording pre-event permanent data on the surveyed electrical system, to the second stage of recording the perturbations is automatical, because the occurrence of perturbations in the operation of the electrical system under surveillance is perceived. The perturbations cause oscillations from the normal analogical or digital variables stored during the previous interval, taken as reference.
The method for surveillance and automatic digital recording of perturbation that occur during electrical systems operation has the following advantages:
- allows the automatic recording of perturbations that occur during the operation of complex interconnected industrial systems: technological, electrical, energetic, etc., in order to analyse the phenomena and determine their causes;
- provides immediate, complete information to the staff that maintains and uses the complex interconnected industrial systems, supporting the analysis and the decisions that will be made for avoiding the respective perturbations in the future.
Brief description of drowings
We will offer in what follows a concrete example of the invention, related to 7 figures:
Figure 1 : The logical diagram of the method for surveillance and automatic digital recording of perturbation occurring during electrical systems operation
Figure 2: The block diagram of the system for surveillance and automatic digital recording of perturbation occurring during electrical systems operation
Figure 3 : Principal flowchart
Figure 4: Principal flowchart
Figure 5 : Event selection flowchart
Figure 6: Enhanced diagram block of the method
Figure 7: Diagram block of the system given as example of the method described above
Best Mode for Carrying Out
According to the invention, the system for surveillance and automatic digital recording of perturbation occurring during electrical systems operation is made up of the acquisition block for process data (1 ), the
protection-filtering module (2), the trigger acquisition module (3), PC process computer (4) and the man-machine interface GUI [graphic user interface] (5).
The acquisition block (1 ) performs the acquisition of functioning data of the electrical system under surveillance, through analogical signals Ut ( ) and/or It ( , digital signals DIt (-T ) and counter/trigger signals. The analogical acquisition plates 1 A enable the acquisition of technological signals Ut ( ) and/or It («-) with variable sampling speed, ranging, for example, from 1000 to 10 000 points/second, the selection of a certain value being determined by the number of acquired signals. According to the value of the technological signals acquired, amplification is provided by an amplifier I B, the amplifying factors ranging from 1 to 100, adjustable so as to obtain signal values that allow comparison of behaviour. In a similar way, the digital acquisition plates 1 C enable the acquisition of digital technological signals DIt (-J1-) in the process. The sampling speed varies and is obviously determined by the number of signs acquired during the time unit, which may vary between two limit values, such as 1 and 10 points/second.
The protection-filter module (2) ensures the protection and galvanic isolation of the input variables (transducers and field signals), taken over through the process data acquisition block (1 ), and the trigger acquisition module (3). The protection-filtering module (2) performs filtering operations through the filters 2A, signal limitation and galvanic isolation of the acquisition channels through the channel accumulators 2B.
The trigger acquisition module (3) performs acquisition, processing and analogical multiplexing operations of the signals taken over from the protection-filtering module (2). The trigger acquisition module (3) has the following complex functions:
- analogical signals acquisition and multiplexing;
- amplification of the analogical signals by factor xl, xlo, xloo;
- analogical signals storage in circular buffer;
- signal acquisition from external trigger; - digital signals acquisition;
- digital signals storage in circular buffer;
- clock pulses acquisition;
- vector signals storage and processing through EEPROM control;
- data transfer to a vector processing unit through transfer interface or DMA.
The values of the analogical variables Ut (*~) and/or It (^ and of the digital variable DIt (-H-) acquired, taken over from the protection- filtering module (2), are multiplexed and amplified in specialized circuits 3A and 3B and stored in a memory circular buffer 3C whose size corresponds to the total number of acquired signals. The Ut ( ),
It(^) and DIt (Λ) signals are compared with the previous values Ut- 1
( rj ), It- 1 ~> ) and DIt- 1 ( -) stored before, through the signal comparator 3D. If a number among the analogical values acquired at moments t and t- 1 are equal (this number is called comparison factor and has a chosen value such as, for example, for a sampling speed of 1000 points/second the comparison factor could be 900), then the process under surveillance is considered without perturbations and the step-by-step value acquisition process continues endlessly. If,
however, the analogical values acquired at t and t- 1 have fewer common points than the value of the comparison factor (for a sampling speed of 1000 points/second the comparison factor is, for example, 900, so the values acquired at t and t- 1 have less than 900 common points), a perturbation is considered to have occurred at moment t and the analogical trigger 3E is also released for recording the wave form on RAM and HDD support and displaying it on monitor (4) through the graphic user interface GUI (5).
For digital signals DIt (Si), the modification of the signal value at moment t as compared with the value stored in buffer 3 C at t- 1 causes the digital trigger 3E release and the recording of the phenomena in the same way as the analogical signals. According to the invention, the system and the method also allow recording of events coming from an external trigger 3G which may be part of parallel equipment or may be released by an operator.
Process computer (4) has an analysis and comparison software and can perform the following: - data storage in RAM memory;
- data storage in HDD;
- event processing and analysis.
The man-machine interface GUI (5) provides the graphic display and therefore allows visualisation of the perturbation events that made necessary the entire system for surveillance and automatic digital recording of perturbations that occur during electrical systems operation.
According to the invention, the method for surveillance and automatic digital recording of perturbations that may occur during electrical systems operation provides that the analogical and/or digital signals that define at each moment the operation of the electrical system under surveillance should be taken over simultaneously and with adjustable frequency by the radial circuits made up of several transducers 1 A, interface devices for data collection and signal conditioning I B, acquisition modules and communication interfaces (2) consisting in normal surveillance inputs and/or special inputs with trigger for reading the data taken over, stored into a circular buffer 3C in two stages; in the first stage - pre-event - the permanent data are collected and stored in a memory area that will be rewritten at each new scanning cycle, representing a reference set of measures for the post- damage analysis, while the second stage records the perturbation in the operation of the electrical system throughout the occurrence of the unpredictable but effective event, having saved the data before joining the pre-event set of data for a variable time set by the user, the data being transmitted to a specialized computation processor (4) -based unit that may be any type of PC computation equipment, having an application software that performs the data acquisition, analysis and storage on the basis of specialized modules such as:
- the acquisition module that performs the simultaneous acquisition of binary and analogical variables, on the basis of an iterative cycling method that allows the reading of all variables with configurable frequency; release module, through which the variables obtained are compared with their values during the previous period of time; on the basis of a chosen proportionality-comparison factor, the recording of
the perturbation event starts automatically;
- the module for display and analysis of the perturbation signal, as well as the display of the whole installation electrical diagram, without interrupting the data acquisition and the recording of events, and
- the communication module that accomplishes, automatically or upon request, the simultaneous portability of data, of the entire useful information respectively, through an optical fibers network towards a monitoring station within a central computer that surveys the electrical system, or other UNIX or Macintosh operation systems, without affecting the possibility of activities in real time or interrupting the data acquisition and the recording of perturbations.
The transit from the first stage of recording pre-event permanent data on the surveyed electrical system, to the second stage of recording the perturbations is automatical, because the occurrence of perturbations in the operation of the electrical system under surveillance is perceived. The perturbations cause oscillations from the normal analogical or digital variables stored during the first stage or activate the existing electrical and/or technological protection devices in the system that operate according to the "OR" logic of event recording when the reference state, the analogical or binary signals suffer modifications, or by release of a software trigger signal by the application software, that can prolong the duration of data recording accordingly, treating them in the same way as normal signals, or manually, by an external device, such as a hardware trigger. All these can also activate the various devices generally included in the protection and signaling circuits of the electrical systems, such as horns, flashing lamps, etc.
Read data are stored in a circular buffer 3C whose size varies according to number of channels and the reading frequency, and are protected by a back-up system against tension drops in the supply circuits.
The system for surveillance and automatic recording of perturbations that may occur during electrical system operation, as described by the invention, is provided with two operation modes, of which one is the normal operation mode where the system is waiting to detect a perturbation in the electrical system under surveillance, and a the other a user configuration mode necessary for programming the important parameters such as the acquisition speed, memory allotment, etc. and for activating the auto-tests. Both operation modes are accessible locally, through a keyboard that may be attached or the connection of a PC portable computer, or at a distance through a network or modem.
BIBLIOGRAPHY
Patent W0 94 / 0721 1 (PCT / SE93 / 00747)
US PATENT 5,216,621
Claims
CLAIM
The method for surveillance and automatic digital recording of perturbations that may occur during electrical systems operation is characterized by the fact that the analogical and/or digital signals that define at each moment the operation of the electrical system under surveillance are taken over simultaneously and with adjustable frequency stored into a circular buffer (3C) in two stages; in the first stage - pre-event - the permanent data are collected and stored in a memory area that will be rewritten at each new scanning cycle, representing a reference set of measures for the post-damage analysis, while the second stage records the perturbation in the operation of the electrical system throughout the occurrence of the unpredictable but effective event, having saved the data before joining the pre-event set of data for a variable time set by the user. The transit from the first stage of recording pre-event permanent data on the surveyed electrical system, to the second stage of recording the perturbations is automatical, because the occurrence of perturbations in the operation of the electrical system under surveillance is perceived. The perturbations cause oscillations from the normal analogical or digital variables stored during the first stage or activate the existing electrical and/or technological protection devices in the system that operate according to the "OR" logic of event recording when the reference state, the analogical or binary signals suffer modifications, or by release of a software trigger signal by the application software, that can prolong the duration of data recording accordingly, treating them in the same way as normal signals, or manually, by an external device,
such as a hardware trigger. All these can also activate the various devices generally included in the protection and signaling circuits of the electrical systems, such as horns, flashing lamps etc.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RO9800580 | 1998-02-27 | ||
| RO98-00580 | 1998-02-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2000010018A2 true WO2000010018A2 (en) | 2000-02-24 |
| WO2000010018A3 WO2000010018A3 (en) | 2000-06-15 |
Family
ID=20106467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/RO1999/000004 WO2000010018A2 (en) | 1998-02-27 | 1999-03-01 | Method for the surveillance and automatic digital recording of electrical systems perturbations |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2000010018A2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9541586B2 (en) | 2014-11-24 | 2017-01-10 | Rockwell Automation Technologies, Inc. | Capture of power quality information at the time a device fails |
| US9568514B2 (en) | 2014-05-19 | 2017-02-14 | Rockwell Automation Technologies, Inc. | Power quality event localization by multiple indexes |
| WO2022148959A1 (en) * | 2021-01-06 | 2022-07-14 | Cloudfm Integrated Services Limited | Monitoring electrical parameters |
| CN117060405A (en) * | 2023-10-11 | 2023-11-14 | 广东鑫钻节能科技股份有限公司 | Electric energy quality control method, system, equipment and medium for digital energy oxygen station |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4589074A (en) * | 1983-08-31 | 1986-05-13 | The Boeing Company | Multiple channel power line monitor |
| US5216621A (en) * | 1991-02-28 | 1993-06-01 | Mehta Tech. Inc. | Line disturbance monitor and recorder system |
-
1999
- 1999-03-01 WO PCT/RO1999/000004 patent/WO2000010018A2/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4589074A (en) * | 1983-08-31 | 1986-05-13 | The Boeing Company | Multiple channel power line monitor |
| US5216621A (en) * | 1991-02-28 | 1993-06-01 | Mehta Tech. Inc. | Line disturbance monitor and recorder system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9568514B2 (en) | 2014-05-19 | 2017-02-14 | Rockwell Automation Technologies, Inc. | Power quality event localization by multiple indexes |
| US9541586B2 (en) | 2014-11-24 | 2017-01-10 | Rockwell Automation Technologies, Inc. | Capture of power quality information at the time a device fails |
| WO2022148959A1 (en) * | 2021-01-06 | 2022-07-14 | Cloudfm Integrated Services Limited | Monitoring electrical parameters |
| GB2603110B (en) * | 2021-01-06 | 2023-09-27 | Cloudfm Integrated Services Ltd | Monitoring electrical parameters |
| CN117060405A (en) * | 2023-10-11 | 2023-11-14 | 广东鑫钻节能科技股份有限公司 | Electric energy quality control method, system, equipment and medium for digital energy oxygen station |
| CN117060405B (en) * | 2023-10-11 | 2024-02-02 | 广东鑫钻节能科技股份有限公司 | Electric energy quality control method, system, equipment and medium for digital energy oxygen station |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000010018A3 (en) | 2000-06-15 |
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