• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a computer system and method for detecting inter-circuit faults in a generator stator (12). The computer system (20) includes: a sampler for sampling phase voltages and phase currents of a generator stator (12); a plurality of predefined program blocks (29) for activating an inter-circuit error detection program (30) based on the sampled phase voltages (40) and phase currents (42); a level detection program block for detecting a plurality of differences between the sampled phase voltages (40) in response to the activated inter-circuit error detection program (30); and a comparison logic element for comparing each of the differences of the sampled phase voltages (40) in response to the activated inter-circuit error detection program (30) and determining an inter-circuit error within at least one phase of the generator stator (12) based on the differences. The computer system may also include a negative sequence voltage program block for detecting DC link faults in a generator stator (12).
    公开号:CH706968B1
    申请号:CH01538/13
    申请日:2013-09-09
    公开日:2017-07-14
    发明作者:Som Shantanu；Ashiono Bukhala Zeeky
    申请人:Gen Electric；
    IPC主号:
    专利说明:

    description
    Background of the Invention The invention described herein relates generally to a multi-circuit generator stator, and more particularly to a computer system and computer-aided method for detecting generator stator inter-circuit faults.
    The current market competition for higher power generators has challenged original equipment manufacturers to develop generators of ever increasing power density. This is achieved by improving the cooling processes of the generators and by introducing parallel circuits in each phase. In order to ensure reliable operation and better availability of these units, manufacturers are required to provide, through applicable international codes and standards, field protection systems that ensure isolation of the unit in the event of an internal fault.
    For example, current protection systems provide stator ground fault protection through 100% stator ground fault detection (64TN), third harmonic stator ground fault detection (27TN), neutral overvoltage detection (59N), and auxiliary overvoltage detection (59X).
    The present invention has for its object to provide a computer system and a computer-aided method that allow reliable detection of inter-circuit errors in generators.
    Brief Description of the Invention The invention relates to a computer system and a computer aided method for detecting inter-circuit faults in a generator stator. The computer system includes: a sampler for sampling phase voltages and phase currents of a generator; a plurality of predefined program blocks for activating a DC link error detection program when an error within the generator stator is detected based on the sampled phase voltages and phase currents; a level detection program block for detecting a plurality of differences between the sampled phase voltages in response to the activated inter-circuit error detection program; and a comparison logic element to compare each of the differences in the sampled phase voltages in response to the activated DC link error detection program and to determine an inter-circuit error within at least one phase of the generator stator based on the differences.
    The computer system may also include a negative sequence overvoltage program block to determine a negative sequence voltage based on the sampled phase voltages and to determine whether the negative sequence voltage exceeds a threshold.
    The level detection program block of the above-mentioned computer system may also include: comparing the sampled phase voltages and determining whether an imbalance between the sampled phase voltages is within a predefined limit.
    The plurality of predefined program blocks of the above-mentioned computer system may include a directional element to determine whether an error is present in the generator stator based on the sampled phase voltages and phase currents.
    The plurality of predefined program blocks of the above-mentioned computer system may include a ground fault desensitizer for determining whether an error is a ground fault based on the sampled phase voltages.
    The plurality of predefined program blocks of the above-mentioned computer system may include a phase error desensitizer for determining whether an error is a phase error based on the sampled phase voltages.
    The function of the computer system or method may be based on a computer program having program code stored in at least one computer readable medium and, when executed, causing the computer system to perform a computer aided method of detecting inter-circuit errors in a generator stator to perform, wherein the steps to the computer-aided method include: sampling phase voltages of the generator stator; Sensing phase currents of the generator stator; Activating an inter-circuit fault detection program when an error within the generator stator is detected based on the sampled phase voltages and phase currents; Determining a plurality of differences between the sampled phase voltages in response to the activation; and comparing each of the differences of the sampled phase voltages in response to the activation and determining an interconnect error within at least one phase of the generator stator based on the differences.
    The computer program may further include the steps of: determining a negative sequence voltage based on the sampled phase voltages and determining whether the negative sequence voltage exceeds a threshold.
    Each of the above-mentioned computer programs may also include the steps of: comparing the sampled phase voltages and determining if an imbalance between the sampled phase voltages is within a predefined limit.
    Further, in the aforementioned computer program, comparing each of the differences in the sampled phase voltages may be achieved in response to determining that the balance between the sampled phase voltages is within the predefined limit.
    Each of the above-mentioned computer programs may further include filtering by means of a timer block to ensure the isolation of a generator under persistent intermediate circuit failure.
    In each of the above-mentioned computer programs, the activation of the intermediate circuit fault detection program may further include the step of determining, based on the sampled phase voltages and the current, whether an error is present in the generator stator.
    In any of the above-mentioned computer programs, the activation of the intermediate circuit fault detection program may further include the step of determining whether an error is a ground fault based on the sampled phase voltages.
    In each of the above-mentioned computer programs, the activation of the intermediate circuit fault detection program may further include the step of determining, based on the sampled phase voltages, whether an error is a phase error.
    The invention further relates to a computer aided method for detecting inter-circuit faults in a generator stator, the method comprising the steps of: sampling phase voltages of the generator stator; sampling phase currents of the generator stator; activating an inter-circuit failure detector if based on the sampled phase voltages and phase currents determine an error within the generator stator; Determining a plurality of differences between the sampled phase voltages (preferably phase effective voltages) in response to the activation; and comparing each of the differences of the sampled phase voltages in response to the activation and determining an interconnect error within at least one phase of the generator stator based on the differences.
    The computerized method may include the steps of determining a negative sequence voltage based on the sampled phase voltages and determining whether the negative sequence voltage exceeds a threshold.
    The above-mentioned computerized method may further include the steps of: comparing the sampled phase voltages and determining if an imbalance between the sampled phase voltages is within a predefined limit.
    In the above-mentioned computerized method, the activation of the intermediate circuit fault detection program may further include the step of determining whether an error is present in the generator stator based on the sampled phase voltages and the current.
    In the above-mentioned computerized method, the activation of the intermediate circuit fault detection program may further include the step of determining whether an error is a ground fault based on the sampled phase voltages.
    In the above-mentioned computerized method, the activation of the intermediate circuit fault detection program may further include the step of determining, based on the sampled phase voltages, whether an error is a phase error.
    Brief Description of the Drawings These and other features of this invention will become more apparent from the following detailed description of the various embodiments of the invention, taken in conjunction with the accompanying drawings, which illustrate various embodiments of the invention.
    Fig. 1 shows a circuit diagram of the phases of the windings for a multi-circuit generator stator according to an embodiment of the invention.
    Fig. 2 illustratively shows an environment for detecting inter-circuit faults in a generator stator according to an embodiment of the invention.
    3 is a block diagram of a system for detecting inter-circuit faults in a generator stator according to embodiments of the invention.
    4 shows a flow chart of a method for detecting inter-circuit faults in a generator stator according to embodiments of the invention.
    5 shows a flow chart of a method for detecting inter-circuit faults in a generator stator according to embodiments of the invention.
    It should be noted that the drawings of the description are not necessarily to scale. The drawings are merely illustrative of typical aspects of the invention and therefore should not be taken as limiting the scope of the description. In the drawings, like reference numerals designate like elements.
    Detailed Description of the Invention As mentioned above, the invention described herein relates generally to a multi-circuit generator stator, and more particularly to a system for detecting generator stator inter-circuit faults.
    The current competition in the market for higher power generators has led OEMs to develop higher power density generators. This is achieved by improving the cooling processes of the generators and by introducing parallel circuits in each phase. To ensure reliable operation and better availability of these units, manufacturers are required to provide protection systems through applicable international standards and network codes on-site to ensure isolation of a unit in the event of an internal fault.
    For example, current protection systems provide stator ground fault protection through 100% stator ground fault detection (64TN), third harmonic / harmonic stator ground fault detection (27TN), neutral overvoltage detection (59N), and auxiliary overvoltage detection (59X). However, none of the current protection systems provide the capability of detecting an inter-circuit fault in a multi-circuit generator stator.
    With reference to Fig. 1, a circuit diagram of the phases 2, 4, 6 of the winding 1 for a generator stator 12 (Fig. 2) according to embodiments of the invention is illustrated. As shown, leads T1 and T4 form the first phase 2, leads T2 and T5 form the second phase 4, and leads T3 and T6 form the third phase 6. Between each pair of leads for each phase are multiple circuits. An inter-circuit error is an error that occurs between the circuits of one phase. For example, between the third-phase leads T3 and T6, there are circuits 7A, 7B and IC, and an inter-circuit fault would be a fault occurring between the circuits 7A and 7B. In a variation, inter-circuit failure may occur between the circuits 7B and 7C or between the circuits 7A and 7C. Intermediate circuit faults of this type, which are not detected and / or not isolated, can cause serious damage to generator stators.
    Aspects of the invention provide a computer system and a computer aided method for detecting inter-circuit faults in a generator stator. The computer system includes: a sampler for sampling phase voltages and phase currents of a generator; a plurality of predefined blocks for activating an inter-circuit error detection program based on the sampled phase voltages and phase currents when an error is detected in the generator stator; a level detection block for detecting a plurality of differences between the sampled phase voltages in response to the activated inter-circuit error detection program; and a compare logic device to compare each of the differences in the sampled phase voltages in response to the enabled intermediate circuit fault detection program and to determine an inter-circuit error within at least one phase of the generator stator based on the differences. The computer system may also include a negative sequence voltage block to detect a phase voltage imbalance in a generator stator. The technical effect of such a computer system is based on the ability to detect inter-circuit errors in a generator stator. The intermediate circuit fault detection program can be used in existing and any future generator protection relays.
    Referring now to Figure 2, an environment 10 for detecting inter-circuit faults on a generator stator 12 in accordance with embodiments of the invention is illustrated below. As such, the environment 10 includes a computer system 20 that is capable of performing a method described herein to detect inter-circuit failure in a generator stator 12. Specifically, the computer system 20 is illustrated with an Inter-Circuit Fault Detection (IC-FD) program 30 that enables the computer system 20 to detect inter-circuit failure in a generator stator 12 by performing a computer-implemented method described herein. In addition, predefined program blocks 29 which activate the IC-FD program 30, as described below, are shown in the computer system 20.
    The computer system 20 includes, as shown: a processing component 22 (eg, one or more processors), a memory component 24 (eg, a memory hierarchy), an input / output (i / o) component 26 (eg, one or more I / O interfaces and / or devices), and a data communication path 28. Generally, the processing component 22 executes program code, eg the predefined program blocks 29 and / or the IC-FD program 30, which are permanently stored at least partially in the memory component 24. During execution of the program code, the processing component 22 is able to process data, which may result in reading and / or writing of transformed data from or to the memory component 24 and / or I / O component 26 to be further processed. The path 28 provides a communication link between each of the components in the computer system 20. The I / O component 26 may include one or more input-output devices that allow a user to interactively control the computer system 20 and / or one or more data communication devices to enable a system user by any means Data exchange connection element with the computer system 20 to exchange data. In addition, the predefined program blocks 29 and / or the IC-FD program 30 may store the data, e.g. sampled phase voltages 40 and / or sampled outer conductor currents 42, using any arbitrary solution (e.g., store, retrieve, generate, manipulate, organize, reproduce, and the like).
    In any event, computer system 20 may include one or more general-purpose computer industrial products (e.g., computing devices) capable of having program code installed thereon, e.g. the predefined program blocks 29 and / or the IC-FD program 30, execute. As used herein, it is understood that the term "program code" means any combination of commands based on any language, code or notation, and that a computing device capable of providing data to cause to perform a special operation either directly or after any combination of the following steps: (a) conversion to another language, code or notation; (b) reproduction in the form of another material; and / or (c) decompression. In that regard, the predefined program blocks 29 and / or the IC-FD program 30 may be embodied as any combination of system software and / or application software and / or firmware application program codes.
    In addition, the predefined program blocks 29 and / or the IC-FD program 30 can be realized by means of a set of modules 32. In this case, a module 32 may cause the computer system 20 to perform a set of tasks used by the predefined program blocks 29 and / or the IC FD program 30, and may be independent of other portions of the predefined program blocks 29 and / or the IC-FD program 30 to be developed and / or carried out separately. As used herein, the term "component" means any configuration of hardware, with or without software, that performs the functionality described in connection therewith using any solution, while the term "module" means program code which causes a computer system 20 to perform the steps described in connection therewith using any solution. When a module is permanently stored in a memory component 24 of a computer system 20 having a processing component 22, it is an integral part of a component that performs the steps. Independently, it is understood that two or more components, modules, and / or systems may share their respective hardware and / or software and / or firmware in part / total. It is further understood that some of the functionality discussed herein may not be performed, or that additional functionality may be integrated with the computer system 20.
    When the computer system 20 includes multiple computing devices, only a portion of the predefined program blocks 29 and / or the IC FD program 30 (eg, one or more modules 32) may be permanently stored on each computing device. However, it will be understood that the computer system 20, the predefined program blocks 29, and / or the IC-FD program 30 merely represent different possible equivalent computer systems capable of performing a method as described herein. As such, the functionality provided by the computer system 20, the predefined program blocks 29, and / or the IC FD program 30 may, in other embodiments, be performed, at least in part, by one or more computing devices including any combination of hardware general and / or special purposes and has or does not have program code. In each embodiment, the hardware, firmware and, if present, the program code may be generated by standard techniques.
    Irrespective of this, when the computer system 20 includes a plurality of computing devices, the computing devices may exchange data via any type of data exchange connection element. Further, while performing a method described herein, the computer system 20 may communicate with one or more other computer systems using any data communications link. In any case, the data exchange connector may include any combination of a variety of types of optical fibers, wired and / or wireless connectors; include any combination of one or more types of networks; and / or any combination of multiple types of transmission techniques and protocols.
    As discussed herein, the predefined program blocks 29 and the IC-FD program 30 allow the computer system 20 to detect inter-circuit errors in a generator stator 12. If an inter-circuit fault is detected, computer system 20 will generate an IC FD trigger signal 50 as shown in FIG. Such a trigger signal can be used to isolate the generator stator 12 and turn off.
    Referring now to Figure 3, there is shown a block diagram of a computer system for detecting inter-circuit faults in a generator stator 12 (Figure 2) according to embodiments of the invention. FIGS. 4 and 5 illustrate a flow chart of a computerized method for detecting inter-circuit faults by means of the computer system shown in FIG.
    In step S1, a sampler samples phase voltages 40 (Va, Vb, Vc) for each phase of the generator stator 12 (Figure 2). In step S2, the sampler samples phase currents 42 (Ia, Ib, Ic) for each phase of the generator stator 12 (FIG. 2).
    Moreover, it is understood that the phase voltages 40 and the phase currents 42 of the generator stator 12 can be sampled by any currently known or future developed sampling technique.
    Several predefined program blocks 29 are provided for activating an inter-circuit error detection (IC-FD) program 30 (i.e., a procedure) based on these sampled phase voltages 40 and phase currents 42. As shown in Fig. 3, the IC FD program 30 includes a level detection program block 34, a compare logic 70, and a negative sequence program block 35. In addition, the IC FD program 30 includes an OR gate 80. The features of the IC FD program 30 will be explained below.
    The plurality of predefined program blocks 29 activate the IC FD program 30 based on the sampled phase voltages 40 and phase currents 42 only in special situations. For example, in decision block D1, the direction of the error is detected by means of the directional element 52. That the directional element 52 determines whether the fault is inside or outside the generator. If the error is not within the generator ("N"), director 52 continues to determine in decision block D1 if there is an error within the generator. Once the directional element 52 determines in decision block D2 that an error is present within the generator ("Y"), a ground fault desensitizer 54 determines, based on the sampled phase voltages 40, whether the error is a ground fault. The parameter threshold for determining whether an error is a ground fault can be set by a user. For example, if a sampled phase voltage 40 is rated less than or equal to about twenty percent (20%), the error from the predefined program blocks 29 may be considered a ground fault ("Y"). In this case, the ground fault desensitizer 54 will continue to determine whether there is a ground fault in decision block D2.
    If the ground fault desensitizer 54 determines that a ground fault is not present ("N"), a phase error desensitizer 56 determines in decision block D3 based on the sampled phase voltages 40 whether the fault is a phase error. The parameter threshold for determining whether an error is a phase error can be set by a user. For example, if it is judged that any two of the sampled phase voltages 40 are less than about sixty percent (60%), the error may be considered as a phase error. The IC-FD program 30 is activated (S3) only if the error is not a phase error ("N"). The predefined program blocks (director 52, ground fault desensitizer 54, and phase error desensitizer 56) thus prevent the IC FD program 30 from being activated unless the fault is within the generator stator 12 (FIG. 2) Error is not a ground fault and the fault is not a phase error. The pre-defined program block 29 may also be provided with a user program block 58 to prevent the IC FD program 30 from being activated. The user program block 58 is a user configurable program block that, when selected, prevents the IC FD program 30 from being activated. The user program block 58, together with the predefined program blocks, the director 52, the ground fault desensitizer 54 and the phase error desensitizer 56, prevents activation of the IC FD program 30.
    When the IC FD program 30 is activated, the level detection 36 of the level detection program block 34 in decision program block S4 determines the differences between each of the sampled quadrature-averaged (QMW) phase voltages 40. As shown in Figure 3, the sampled voltages pass through For example, with respect to the level detection 36, X is the difference between the sampled phase effective voltage Va and the sampled phase effective voltage Vb. Y is the difference between the sampled phase effective voltage Vb and the sampled phase effective voltage Vc. Z is the difference between the sampled phase effective voltage Vc and the sampled phase effective voltage Va. The level detection program block 34 also includes an imbalance desensitizer 38 that does not allow the compare logic 70 to expire when the imbalances of the sampled phase voltages Va, Vb, Vc are within limits that can be adjusted by the user. For example, compare logic 70 (S5) is only started if the imbalance in decision program block D4 is not within a predefined limit set by the user ("N"). Usually, an imbalance limit of + 10% can be set to allow phase load imbalance. The imbalance desensitizer 38 may include multiple relays.
    In step S5, these differences (X, Y, Z) of the sampled phase-effective voltages 40 are compared by the comparison logic 70. Based on the differences (X, Y, Z), compare logic 70 determines, via OR gate 80, whether an inter-circuit fault is within at least one phase of generator stator 12 (Figure 2). That the A phase 72 would logically be H "1" if an inter-circuit fault lies within the T1-T4 phase 2 (i.e., the sampled phase effective voltage Va). When the logic high state of the A phase 72 is reached, an A phase detector 73 (i.e., a memory flag for registering an A-phase intermediate circuit error event) is set high. The logic of the A-phase picker 73 may be programmed as a trend parameter that could be checked during the diagnosis of an inter-circuit fault event for a pick-up event. The B-phase 74 would logically be H "1" if an inter-circuit error is within the T2-T5 phase 4 (i.e., the sampled phase-effective voltage Vb). When the B phase logical high state 74 is reached, a B phase detector 75 (i.e., a B phase intermediate circuit fault event registration flag) is set high. The logic of the B-phase picker 75 may be programmed as a trend parameter that could be checked during the diagnosis of an inter-circuit fault event for a pick-up event.
    The C-phase 76 would logically be H "1" if an inter-circuit error is within the T3-T6 phase 6 (i.e., the sampled phase-effective voltage Vc). When the C-phase logical H state 76 is reached, a C-phase receiver 77 (i.e., a C-phase intermediate circuit fault event registration flag) is set high. The logic of the C-phase picker 77 may be programmed as a trend parameter that could be checked during the diagnosis of an inter-circuit fault event for a pick-up event. The compare logic 70 may also include a delay 78 (i.e., timer program blocks) for each phase 72, 74, 76 to insure isolation of the generator under persistent inter-circuit failure.
    In addition to the level detection program block 34 and the comparison logic 70, a parallel counter system overvoltage (59_2) program block 35 is provided. The negative sequence program block 35 receives the sampled voltages 40. The negative sequence program block 35 receives sampled phase voltages 40 via star or delta circuit voltage converter terminals. The sampled phase voltages 40 are processed in the negative sequence program block 35 to obtain a negative sequence voltage (V_2). The negative sequence voltage (V_2) is compared with a user settable threshold to detect an overvoltage condition (59_2). The negative sequence overvoltage detection by the negative sequence program block 35 is used to detect a loss of one or two phases, or an asymmetric voltage condition corresponding to an intermediate circuit fault condition. In step S6, the negative sequence voltages are determined. If the negative sequence voltage exceeds a user adjustable threshold (i.e., a pickup value) for a preselected delay 78, an IC FD signal is generated in step S7. If an intermediate circuit fault is detected in any of the phases by a combination of the level detection 34 and the comparison logic 70 or the negative sequence program block 35, an IC FD trigger signal 50 is generated in step S8 which can be used to isolate and destroy the generator unit Net to take.
    While aspects of the invention are shown and described herein with reference to a computerized method and computer system for detecting inter-circuit faults in a generator stator 12 (FIG. 2), it will be understood that they additionally enable a variety of alternative embodiments. The computerized method relies upon program code stored on at least one computer readable medium and, when executed, causes a computer system 20 to perform the method of detecting inter-circuit errors in a generator stator 12 (FIG. 2). Accordingly, the computer readable medium includes program code, e.g. the predefined program blocks 29 and / or the IC-FD program 30 (FIG. 2), which performs a method described here partially or completely. It should be understood that the term "computer-readable medium" includes one or more types of material means of expression currently known or developed in the future by which a computer device may obtain, reproduce or otherwise transmit a copy of the program code can be. For example, the computer readable medium may include: one or more portable industrially manufactured storage articles: one or more memory / storage components of a computing device; Paper; and / or the like.
    The terminology used herein is merely for the convenience of explanation of specific embodiments and is not intended to limit the description. As used herein, the singular forms of indefinite or definite articles are intended to include the plural forms as well, unless the contrary expressly implies otherwise. It is further understood that the terms "based on," "include," "comprise," and / or "include" used in this specification specify the presence of named features, integers, steps, operations, operations, elements, and / or components but do not exclude the presence or addition of other features, integers, steps, operations, operations, elements, components and / or groups thereof.
    The present description uses examples to describe the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, for example, make and use any devices and systems, and any methods associated therewith perform. The patentable scope of the invention is defined by the claims, and may include other examples of skill in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
    Aspects of the invention provide a computer system and a computer aided method for detecting inter-circuit faults in a generator stator. The computer system includes: a sampler for sampling phase voltages and phase currents of a generator stator; a plurality of predefined blocks for activating an inter-circuit error detection program based on the sampled phase voltages and phase currents when an error is detected in the generator stator; a level detection program block for detecting a plurality of differences between the sampled phase voltages in response to the activated inter-circuit error detection program; and a comparison logic element for comparing each of the differences in the sampled phase voltages in response to the activated inter-circuit error detection program and for determining an inter-circuit error within at least one phase of the generator stator based on the differences. The
    The computer system may also include a negative sequence voltage program block for detecting intermediate circuit faults in a generator stator.
    REFERENCE SIGNS LIST 1 winding 2, 4, 6 phases 7A, 7B, 7C circuits 10 environment 12 generator stator 20 computer system 22 processing component 24 memory component 26 I / O component 28 data communication path 29 predefined program blocks 30 intermediate circuit error detection program 32 modules 34 level detection program block 35 negative sequence program block 36 Level Detection 40 Scanned Phase Voltages 42 Scanned External Conductor Currents 50 IC FD Trigger Signal 52 Directed Member 54 Ground Desensitizer 56 Phase Error Desensitizer 58 User Program Block 70 Comparison Logic 72 A Phase 73 A Phase Pickup 74 B Phase 75 B Phase Pickup 76 C Phase 77 C Phase pickup 78 Preset delay 80 OR gate
    权利要求:
    Claims (10)
    [1]
    claims
    A computer system (20) including: a sampler for sampling phase voltages and phase currents of a generator stator (12); a plurality of predefined program blocks (29) for activating an intermediate circuit fault detection program (30) when an error is detected within the generator stator (12) based on the sampled phase voltages (40) and phase currents (42); a level detection program block (34) for detecting a plurality of differences between the sampled phase voltages (40) in response to the activated inter-circuit error detection program (30); and a comparison logic element (70) forming part of the intermediate circuit fault detection program (30) for comparing each of the differences of the sampled phase voltages (40) in response to the activated intermediate circuit fault detection program (30) and one based on the differences Intermediate circuit error within at least one phase of the generator stator (12) to determine.
    [2]
    The computer system (20) of claim 1, further comprising a negative sequence overvoltage program block (35) to determine a negative sequence voltage based on the sampled phase voltages (40) and to determine whether the negative sequence voltage exceeds a threshold.
    [3]
    The computer system (20) of claim 1 or 2, wherein the level detection program block (34) further comprises: comparing the sampled phase voltages (40) and determining if an imbalance between the sampled phase voltages (40) is within a predefined limit.
    [4]
    The computer system (20) of any one of claims 1 to 3, wherein the plurality of predefined program blocks (29) include: a directed member (52) for determining, based on the sampled phase voltages (40) and phase currents (42) an error is present in the generator stator (12) and / or a ground fault desensitizer (54) to determine, based on the sampled phase voltages (40), whether an error is a ground fault, and / or a phase error desensitizer (54 56) to determine, based on the sampled phase voltages (40), whether an error is a phase error.
    [5]
    A computerized method based on program code stored in at least one computer readable medium which, when executed, causes a computer system (20) to perform a method of detecting inter-circuit failures in a generator stator (12), the method comprising the steps of: sensing phase voltages (40) of the generator stator (12); Sampling phase currents (42) of the generator stator (12); Activating an intermediate circuit fault detection program (30) when an error within the generator stator (12) is determined based on the sampled phase voltages (40) and phase currents (42); Determining a plurality of differences between the sampled phase voltages (40) in response to the activation; and comparing each of the differences of the sampled phase voltages (40) in response to the activation and determining an inter-circuit error within at least one phase of the generator stator (12) based on the differences.
    [6]
    The computerized method of claim 7, further comprising at least one of: determining a negative sequence voltage based on the sampled phase voltages (40) and determining whether the negative sequence voltage exceeds a threshold; Comparing the sampled phase voltages (40) and determining if an imbalance between the sampled phase voltages (40) is within a predefined limit; Filtering by means of a timer program block to ensure the isolation of a generator under a persistent intermediate circuit fault.
    [7]
    The computerized method of claim 5 or 6, wherein comparing each of the differences in the sampled phase voltages (40) is further in response to determining that the balance between the sampled phase voltages (40) is within the predefined limit.
    [8]
    The computerized method of any one of claims 6 and 7, wherein the activation of the intermediate circuit fault detection program (30) further comprises at least one of the steps of: determining, based on the sampled phase voltages (40) and the sampled phase current (42) whether an error is present in the generator stator (12); Determining, based on the sampled phase voltages (40), whether an error is a ground fault. Determining, based on the sampled phase voltages (40), whether an error is a phase error.
    [9]
    The computerized method of any one of claims 6 to 8, further comprising at least one of: determining a negative sequence voltage based on the sampled phase voltages (40) and determining whether the negative sequence voltage exceeds a threshold; Comparing the sampled phase voltages (40) and determining if an imbalance between the sampled phase voltages (40) is within a predefined limit.
    [10]
    The computerized method of any one of claims 6 to 9, wherein the activation of the intermediate circuit fault detection program (30) further includes at least one of the steps of: determining, based on the sampled phase voltages (40) and the sampled phase current (42) whether an error is present in the generator stator (12); Determining, based on the sampled phase voltages (40), whether an error is a ground error, determining, based on the sampled phase voltages (40), whether an error is a phase error.
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    同族专利:
    公开号 | 公开日
    JP2014055952A|2014-03-27|
    JP6411720B2|2018-10-24|
    US20140074413A1|2014-03-13|
    CH706968A2|2014-03-14|
    DE102013109546A1|2014-03-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4964058A|1988-10-13|1990-10-16|Square D Company|Power management and automation system|
    JP4508211B2|2007-05-16|2010-07-21|国立大学法人名古屋大学|Electrical equipment winding diagnosis system|
    JP5300349B2|2008-07-03|2013-09-25|三菱電機株式会社|Motor control device and motor ground fault detection method|
    US8140291B2|2009-02-03|2012-03-20|General Electric Company|Stator turn fault detection apparatus and method for induction machine|
    US20120109546A1|2010-10-29|2012-05-03|General Electric Company|Identification of rotor broken bar in presence of load pulsation|
    US8803461B2|2010-12-22|2014-08-12|Arvind Kumar Tiwari|System and method for synchronous machine health monitoring|
    WO2013004285A1|2011-07-04|2013-01-10|Abb Research Ltd|System for detecting internal winding faults of a synchronous generator, computer program product and method|DE102016201127A1|2016-01-27|2017-07-27|Robert Bosch Gmbh|Method for detecting a fault in a generator unit|
    US10256761B2|2016-08-31|2019-04-09|Intel Corporation|Monitoring health of electrical equipment|
    CN113311333A|2021-05-26|2021-08-27|北京航空航天大学|High-speed blower stator online fault diagnosis system and method|
    法律状态:
    2017-03-15| NV| New agent|Representative=s name: GENERAL ELECTRIC TECHNOLOGY GMBH GLOBAL PATENT, CH |
    2021-04-30| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    US13/613,721|US20140074413A1|2012-09-13|2012-09-13|Detection of generator stator inter-circuit faults|
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