A fault detection method and device for a demagnetization circuit jumper of an excitation system

Abstract

The present invention discloses a fault detection method and device for a demagnetization circuit jumper of an excitation system, wherein the method comprises: a detection circuit comprises an excitation regulator, a current transformer, a jumper circuit, a rectifier and energy storage circuit, a comparison circuit and a signal output circuit, and specific detection steps are: connecting the current transformer in series to the jumper circuit; the current transformer collects the current passing through the demagnetization circuit jumper and outputs the secondary side current; the secondary side current of the current transformer is input into the rectifier and energy storage circuit to obtain a detection voltage; the detection voltage is compared with a voltage reference value through a comparison circuit to output a comparison result; if the comparison result is abnormal, an abnormal signal is sent to the excitation regulator through the signal output circuit; and a logical judgment is performed in the excitation regulator to judge whether the demagnetization circuit jumper is faulty.

Description

Technical Field

[0001] The present invention relates to the technical field of demagnetization circuit jumper detection in an excitation system, and in particular to a fault detection method and device for a demagnetization circuit jumper in an excitation system. Background Art

[0002] The excitation system is the core part of the synchronous generator, which plays a vital role in the safe and stable operation of the generator and the quality of the entire power grid system. When the generator fails, such as a three-phase short circuit at the machine end, a loss of step due to demagnetization or low excitation, or incorrect quasi-synchronization, a negative magnetic field current will be induced in the rotor winding, thereby generating an overvoltage. If there is no release circuit for this energy, the induced voltage will rise rapidly and reach several times the withstand voltage test voltage of the rotor winding, seriously threatening the safety of the rotor and the equipment connected to the rotor.

[0003] As the capacity of generator sets continues to increase, the rotor voltage level and current are further improved. After a fault occurs, the magnetic field current induced in the rotor winding also increases, which puts higher requirements on the reliability of the excitation system demagnetization device. In the generator excitation system, nonlinear resistors or linear resistors and thyristor demagnetization circuit jumpers are used to demagnetize the rotor and protect the rotor from overvoltage. Rotor overvoltage not only has forward overvoltage but also reverse overvoltage, so the demagnetization circuit jumper thyristor includes two thyristors, one of which is used for demagnetization and reverse overvoltage, and the other is used for forward overvoltage. When the generator rotor has a forward overvoltage, the excitation system issues a command to trigger the forward thyristor connected between the positive and negative poles of the generator rotor, connect the nonlinear or linear resistor to the generator rotor, and absorb the excessive induced voltage and energy in the rotor. When the generator rotor has a reverse overvoltage or the excitation system demagnetizes, the reverse thyristor is triggered, and the nonlinear or linear resistor is connected to the generator rotor to absorb the excessive energy in the rotor. It is the reliable action of the demagnetization circuit jumper of the excitation system that can ensure the safe operation of the generator.

[0004] In view of the importance of the demagnetization circuit jumper, it is necessary to frequently or in real time test the working performance of the demagnetization circuit jumper. In the generator excitation system, the demagnetization circuit jumper can be used for demagnetization and rotor overvoltage protection. In the self-parallel excitation system of large steam turbine generators, a standard demagnetization circuit jumper linear demagnetization scheme is generally adopted, including a magnetic field circuit breaker installed on the DC side of the power rectifier bridge of the excitation system, a demagnetization circuit jumper and a linear demagnetization resistor, etc. Since the demagnetization circuit is in the high-voltage part of the generator, the existing related technology cannot perform real-time working detection of the demagnetization circuit jumper. It can only be carried out by professional maintenance personnel of the power plant during the shutdown and maintenance of the generator. In addition, the inspection process is cumbersome and special detection instruments are required, which makes the detection cost of the demagnetization circuit jumper high, the detection is difficult and the detection is time-consuming. Summary of the invention

[0005] In order to overcome the technical defects of high detection cost, great detection difficulty and long detection time of the demagnetization circuit jumper in the above-mentioned prior art, the present invention provides a fault detection method and device for the demagnetization circuit jumper of the excitation system.

[0006] In order to solve the above problems, the present invention is implemented according to the following technical solutions:

[0007] In a first aspect, the present invention discloses a fault detection method for a jumper in a demagnetization circuit of an excitation system. The detection circuit includes an excitation regulator, a current transformer, a jumper circuit, a rectification and energy storage circuit, a comparison circuit, and a signal output circuit. The specific detection steps are as follows:

[0008] Step S1: Connect the current transformer in series to the jumper loop;

[0009] Step S2: The current transformer collects the current passing through the demagnetization circuit jumper and outputs the secondary side current;

[0010] Step S3: inputting the secondary side current of the current transformer into the rectification and energy storage circuit to obtain a detection voltage;

[0011] Step S4: comparing the detected voltage with the voltage reference value through a comparison circuit to output a comparison result;

[0012] Step S5: If the comparison result is abnormal, an abnormal signal is sent to the excitation regulator through the signal output circuit;

[0013] Step S6: Perform a logical judgment in the excitation regulator to determine whether the demagnetization circuit jumper is faulty.

[0014] As an optional implementation, in the first aspect of the embodiment of the present invention, the current transformer collects the current passing through the demagnetization circuit jumper and outputs the secondary side current, specifically including:

[0015] The jumper circuit includes a nonlinear resistor GB, a forward and reverse thyristor V1, a forward and reverse thyristor V2, a current transformer CT and a generator rotor L; wherein the current transformer is a common electromagnetic through-core current transformer;

[0016] When the jumper is demagnetized normally, the current flowing through the current transformer is direct current;

[0017] If direct current passes through the primary side of the current transformer, the current transformer will enter a magnetic saturation state and no continuous current will be generated on the secondary side;

[0018] When the jumper fails, the current flowing through the current transformer is pulsating DC or AC;

[0019] If a pulsating current or alternating current passes through the primary side of the current transformer, the current transformer will not enter a magnetic saturation state, and current will be generated on the secondary side;

[0020] Get the current generated by the secondary side of the current transformer.

[0021] As an optional implementation manner, in the first aspect of the embodiment of the present invention, the inputting the secondary side current of the current transformer into the rectification and energy storage circuit to obtain the detection voltage specifically includes:

[0022] The rectification and energy storage circuit includes a rectification bridge circuit and an RC energy storage circuit, and the rectification circuit is connected to an access point on the secondary side of the current transformer;

[0023] The rectifier bridge circuit includes a diode D1, a diode D2, a diode D3 and a diode D4, the rectifier bridge circuit and the RC energy storage circuit are directly provided with a diode D5, and the RC energy storage circuit includes a resistor R and a capacitor C;

[0024] The forward thyristor and reverse thyristor in the circuit can be converted into a positive current with the same direction through the rectifier bridge circuit.

[0025] The voltage across the energy storage detection capacitor C is measured to obtain the detection voltage.

[0026] As an optional implementation, in the first aspect of the embodiment of the present invention, the comparing circuit compares the detection voltage with the voltage reference value to output a comparison result, specifically including:

[0027] Obtaining a preset voltage reference value;

[0028] Electrically isolate the excitation regulator and detection circuit;

[0029] The detection voltage is compared with the voltage reference value through a comparison circuit;

[0030] Get the comparison result information output by the comparison circuit.

[0031] As an optional implementation, in the first aspect of the embodiment of the present invention, the logic judgment is performed in the excitation regulator to determine whether the demagnetization circuit jumper is faulty, specifically including the following sub-steps:

[0032] The excitation regulator executes a decision logic based on the comparison result information;

[0033] The abnormal signal from the signal output circuit is collected an average of 6 times in one cycle;

[0034] If a total of 60 abnormal signals from the signal output circuit are detected within 10 consecutive cycles, it is considered that the de-excitation circuit jumper is faulty;

[0035] If the number of abnormal signals detected from the signal output circuit is less than 60 within 10 consecutive cycles, it is considered that the demagnetization circuit jumper is faulty, and the demagnetization circuit jumper is considered to be operating normally.

[0036] In a second aspect, a fault detection device for a jumper in a demagnetization circuit of an excitation system, wherein the detection circuit includes an excitation regulator, a current transformer, a jumper circuit, a rectification and energy storage circuit, a comparison circuit, and a signal output circuit, specifically including:

[0037] A detection preparation module M1 is used to connect the current transformer in series to the jumper circuit;

[0038] The current collection module M2 is used to enable the current transformer to collect the current passing through the demagnetization circuit jumper and output the secondary side current;

[0039] The voltage acquisition module M3 is used to input the secondary side current of the current transformer into the rectification and energy storage circuit to obtain the detection voltage;

[0040] The voltage comparison module M4 is used to compare the detection voltage with the voltage reference value through a comparison loop to output a comparison result;

[0041] The abnormal output module M5 is used to send an abnormal signal to the excitation regulator through the signal output circuit if the comparison result is abnormal;

[0042] The logic judgment module M6 is used to perform logic judgment in the excitation regulator to determine whether the demagnetization circuit jumper is faulty.

[0043] As an optional implementation, in the second aspect of the embodiment of the present invention, the current acquisition module specifically includes:

[0044] The jumper circuit includes a nonlinear resistor GB, a forward and reverse thyristor V1, a forward and reverse thyristor V2, a current transformer CT and a generator rotor L; wherein the current transformer is a common electromagnetic through-core current transformer;

[0045] When the jumper is demagnetized normally, the current flowing through the current transformer is direct current;

[0046] If direct current passes through the primary side of the current transformer, the current transformer will enter a magnetic saturation state and no continuous current will be generated on the secondary side;

[0047] When the jumper fails, the current flowing through the current transformer is pulsating DC or AC;

[0048] If a pulsating current or alternating current passes through the primary side of the current transformer, the current transformer will not enter a magnetic saturation state, and current will be generated on the secondary side;

[0049] Get the current generated by the secondary side of the current transformer.

[0050] As an optional implementation, in the second aspect of the embodiment of the present invention, the voltage acquisition module specifically includes:

[0051] The rectification and energy storage circuit includes a rectification bridge circuit and an RC energy storage circuit, and the rectification circuit is connected to an access point on the secondary side of the current transformer;

[0052] The rectifier bridge circuit includes a diode D1, a diode D2, a diode D3 and a diode D4, the rectifier bridge circuit and the RC energy storage circuit are directly provided with a diode D5, and the RC energy storage circuit includes a resistor R and a capacitor C;

[0053] The forward thyristor and reverse thyristor in the circuit can be converted into a positive current with the same direction through the rectifier bridge circuit.

[0054] The voltage across the energy storage detection capacitor C is measured to obtain the detection voltage.

[0055] As an optional implementation, in the second aspect of the embodiment of the present invention, the comparing circuit compares the detection voltage with the voltage reference value to output a comparison result, specifically including:

[0056] Obtaining a preset voltage reference value;

[0057] Electrically isolate the excitation regulator and the ratio detection circuit;

[0058] The detection voltage is compared with the voltage reference value through a comparison circuit;

[0059] Get the comparison result information output by the comparison circuit.

[0060] As an optional implementation, in the second aspect of the embodiment of the present invention, when the logic judgment module is running, it specifically includes the following sub-steps:

[0061] The excitation regulator executes a decision logic based on the comparison result information;

[0062] The abnormal signal from the signal output circuit is collected an average of 6 times in one cycle;

[0063] If a total of 60 abnormal signals from the signal output circuit are detected within 10 consecutive cycles, it is considered that the de-excitation circuit jumper is faulty;

[0064] If the number of abnormal signals detected from the signal output circuit is less than 60 within 10 consecutive cycles, it is considered that the demagnetization circuit jumper is faulty, and the demagnetization circuit jumper is considered to be operating normally.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] The present invention creatively adds a current transformer to collect the current passing through the demagnetization circuit jumper, collects the electric energy generated by the secondary side of the current transformer through the rectification and energy storage circuit, and sends the electric energy to the excitation regulator after distinguishing the transient or continuous state through the comparison circuit and the signal output circuit. The excitation regulator performs a logical judgment inside the excitation regulator to obtain a detection result of whether the working state of the demagnetization circuit jumper is normal or not. The method disclosed by the present invention can accurately judge the state of the demagnetization circuit jumper, realize the online fault detection of the demagnetization circuit jumper, greatly reduce the detection difficulty, and do not need to use a dedicated measuring instrument, which can effectively save the hardware cost in the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0068] Figure 1 It is a flow chart of a fault detection method for a demagnetization circuit jumper of an excitation system according to the present invention;

[0069] Figure 2 It is a schematic diagram of the installation of the current transformer and the jumper circuit of the present invention;

[0070] Figure 3 is a schematic diagram of the rectification and energy storage circuit of the present invention;

[0071] Figure 4 is a schematic diagram of a comparison circuit and a signal output circuit of the present invention;

[0072] Figure 5 The present invention is a schematic structural diagram of a fault detection device for a demagnetization circuit jumper of an excitation system. DETAILED DESCRIPTION

[0073] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0074] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0075] The access device and the server can be directly or indirectly connected through wired or wireless communication. The access device can be a terminal or a server. The target application is running on the access device. The target application is an application that can initiate data requests to the server, such as social applications, payment applications, game applications, etc. The server can be an application server that provides services for the target application, or a proxy server that is different from the application server corresponding to the target application. The server is used to identify whether each access device is a malicious device and intercept data messages from malicious devices. When the server is a proxy server, the proxy server forwards data messages that do not belong to malicious devices to the application server. The terminal can be a desktop terminal or a mobile terminal, and the mobile terminal can be a smart phone, a tablet computer, a laptop, a desktop computer, a smart speaker, a smart watch, etc., but is not limited to this. The server and the server can be independent physical servers, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and basic cloud computing services such as big data and artificial intelligence platforms.

[0076] Example 1

[0077] like Figures 1 to 4 As shown, in the first aspect, the present invention discloses a fault detection method for a jumper in a demagnetization circuit of an excitation system, wherein the detection circuit comprises an excitation regulator, a current transformer, a jumper circuit, a rectification and energy storage circuit, a comparison circuit and a signal output circuit, and the specific detection steps are as follows:

[0078] Step S1: Connect the current transformer in series to the jumper loop;

[0079] Step S2: The current transformer collects the current passing through the demagnetization circuit jumper and outputs the secondary side current;

[0080] Step S3: inputting the secondary side current of the current transformer into the rectification and energy storage circuit to obtain a detection voltage;

[0081] Step S4: comparing the detected voltage with the voltage reference value through a comparison circuit to output a comparison result;

[0082] Step S5: If the comparison result is abnormal, an abnormal signal is sent to the excitation regulator through the signal output circuit;

[0083] Step S6: Perform a logical judgment in the excitation regulator to determine whether the demagnetization circuit jumper is faulty.

[0084] like Figure 2 As shown, as an optional implementation, in the first aspect of the embodiment of the present invention, the current transformer collects the current passing through the demagnetization circuit jumper and outputs the secondary side current, specifically including:

[0085] The jumper circuit includes a nonlinear resistor GB, a forward and reverse thyristor V1, a forward and reverse thyristor V2, a current transformer CT and a generator rotor L; wherein the current transformer is a common electromagnetic through-core current transformer;

[0086] When the jumper is demagnetized normally, the current flowing through the current transformer is direct current;

[0087] If direct current passes through the primary side of the current transformer, the current transformer will enter a magnetic saturation state and no continuous current will be generated on the secondary side;

[0088] When the jumper fails, the current flowing through the current transformer is pulsating DC or AC;

[0089] If a pulsating current or alternating current passes through the primary side of the current transformer, the current transformer will not enter a magnetic saturation state, and current will be generated on the secondary side;

[0090] Get the current generated by the secondary side of the current transformer.

[0091] like Figure 3 As shown, as an optional implementation, in the first aspect of the embodiment of the present invention, the inputting of the secondary side current of the current transformer into the rectification and energy storage circuit to obtain the detection voltage specifically includes:

[0092] The rectification and energy storage circuit includes a rectification bridge circuit and an RC energy storage circuit, and the rectification circuit is connected to an access point on the secondary side of the current transformer;

[0093] The rectifier bridge circuit includes a diode D1, a diode D2, a diode D3 and a diode D4, the rectifier bridge circuit and the RC energy storage circuit are directly provided with a diode D5, and the RC energy storage circuit includes a resistor R and a capacitor C;

[0094] The forward thyristor and reverse thyristor in the circuit can be converted into a positive current with the same direction through the rectifier bridge circuit.

[0095] The voltage across the energy storage detection capacitor C is measured to obtain the detection voltage.

[0096] Among them, the comparison circuit and the signal output circuit are as follows Figure 4 As shown, as an optional implementation, in the first aspect of the embodiment of the present invention, the comparison circuit compares the detection voltage with the voltage reference value to output a comparison result, specifically including:

[0097] Obtaining a preset voltage reference value;

[0098] Electrically isolate the excitation regulator and detection circuit;

[0099] The detection voltage is compared with the voltage reference value through a comparison circuit;

[0100] Get the comparison result information output by the comparison circuit.

[0101] As an optional implementation, in the first aspect of the embodiment of the present invention, the logic judgment is performed in the excitation regulator to determine whether the demagnetization circuit jumper is faulty, specifically including the following sub-steps:

[0102] The excitation regulator executes a decision logic based on the comparison result information;

[0103] The abnormal signal from the signal output circuit is collected an average of 6 times in one cycle;

[0104] If a total of 60 abnormal signals from the signal output circuit are detected within 10 consecutive cycles, it is considered that the de-excitation circuit jumper is faulty;

[0105] If the number of abnormal signals detected from the signal output circuit is less than 60 within 10 consecutive cycles, it is considered that the demagnetization circuit jumper is faulty, and the demagnetization circuit jumper is considered to be operating normally.

[0106] Compared with the prior art, the present invention also has the following advantages:

[0107] 1. Current transformers are safe and reliable and are widely used in power systems. Compared with other current measuring devices, such as Hall current sensors, they are more reliable and stable.

[0108] 2. It can realize online fault detection of jumpers and monitor jumper loading in real time, while avoiding the complicated manual jumper detection process.

[0109] 3. Fault diagnosis is performed based on the existing microcomputer excitation regulation of the excitation system, without the need for dedicated measuring instruments, thus saving hardware costs.

[0110] The present invention creatively adds a current transformer to collect the current passing through the demagnetization circuit jumper, collects the electric energy generated by the secondary side of the current transformer through the rectification and energy storage circuit, and sends the electric energy to the excitation regulator after distinguishing the transient or continuous state through the comparison circuit and the signal output circuit. The excitation regulator performs a logical judgment inside the excitation regulator to obtain a detection result of whether the working state of the demagnetization circuit jumper is normal or not. The method disclosed by the present invention can accurately judge the state of the demagnetization circuit jumper, realize the online fault detection of the demagnetization circuit jumper, greatly reduce the detection difficulty, and do not need to use a dedicated measuring instrument, which can effectively save the hardware cost in the detection process.

[0111] For other steps of the fault detection method for the demagnetization circuit jumper of the excitation system described in this embodiment, refer to the prior art.

[0112] Example 2

[0113] like Figure 2 As shown, in the second aspect, a fault detection device for a jumper in a demagnetization circuit of an excitation system, the detection circuit includes an excitation regulator, a current transformer, a jumper circuit, a rectification and energy storage circuit, a comparison circuit and a signal output circuit, specifically including:

[0114] A detection preparation module M1 is used to connect the current transformer in series to the jumper circuit;

[0115] The current collection module M2 is used to enable the current transformer to collect the current passing through the demagnetization circuit jumper and output the secondary side current;

[0116] The voltage acquisition module M3 is used to input the secondary side current of the current transformer into the rectification and energy storage circuit to obtain the detection voltage;

[0117] The voltage comparison module M4 is used to compare the detection voltage with the voltage reference value through a comparison loop to output a comparison result;

[0118] The abnormal output module M5 is used to send an abnormal signal to the excitation regulator through the signal output circuit if the comparison result is abnormal;

[0119] The logic judgment module M6 is used to perform logic judgment in the excitation regulator to determine whether the demagnetization circuit jumper is faulty.

[0120] As an optional implementation, in the second aspect of the embodiment of the present invention, the current acquisition module specifically includes:

[0121] The jumper circuit includes a nonlinear resistor GB, a forward and reverse thyristor V1, a forward and reverse thyristor V2, a current transformer CT and a generator rotor L; wherein the current transformer is a common electromagnetic through-core current transformer;

[0122] When the jumper is demagnetized normally, the current flowing through the current transformer is direct current;

[0123] If direct current passes through the primary side of the current transformer, the current transformer will enter a magnetic saturation state and no continuous current will be generated on the secondary side;

[0124] When the jumper fails, the current flowing through the current transformer is pulsating DC or AC;

[0125] If a pulsating current or alternating current passes through the primary side of the current transformer, the current transformer will not enter a magnetic saturation state, and current will be generated on the secondary side;

[0126] Get the current generated by the secondary side of the current transformer.

[0127] As an optional implementation, in the second aspect of the embodiment of the present invention, the voltage acquisition module specifically includes:

[0128] The rectification and energy storage circuit includes a rectification bridge circuit and an RC energy storage circuit, and the rectification circuit is connected to an access point on the secondary side of the current transformer;

[0129] The rectifier bridge circuit includes a diode D1, a diode D2, a diode D3 and a diode D4, the rectifier bridge circuit and the RC energy storage circuit are directly provided with a diode D5, and the RC energy storage circuit includes a resistor R and a capacitor C;

[0130] The forward thyristor and reverse thyristor in the circuit can be converted into a positive current with the same direction through the rectifier bridge circuit.

[0131] The voltage across the energy storage detection capacitor C is measured to obtain the detection voltage.

[0132] As an optional implementation, in the second aspect of the embodiment of the present invention, the comparing circuit compares the detection voltage with the voltage reference value to output a comparison result, specifically including:

[0133] Obtaining a preset voltage reference value;

[0134] Electrically isolate the excitation regulator and the ratio detection circuit;

[0135] The detection voltage is compared with the voltage reference value through a comparison circuit;

[0136] Get the comparison result information output by the comparison circuit.

[0137] As an optional implementation, in the second aspect of the embodiment of the present invention, when the logic judgment module is running, it specifically includes the following sub-steps:

[0138] The excitation regulator executes a decision logic based on the comparison result information;

[0139] The abnormal signal from the signal output circuit is collected an average of 6 times in one cycle;

[0140] If a total of 60 abnormal signals from the signal output circuit are detected within 10 consecutive cycles, it is considered that the de-excitation circuit jumper is faulty;

[0141] If the number of abnormal signals detected from the signal output circuit is less than 60 within 10 consecutive cycles, it is considered that the demagnetization circuit jumper is faulty, and the demagnetization circuit jumper is considered to be operating normally.

[0142] When in operation, the fault detection device for the demagnetization circuit jumper of the excitation system disclosed in this embodiment can run all the steps of the fault detection method for the demagnetization circuit jumper of the excitation system described in Example 1 to achieve the same technical effect of reducing the detection difficulty and hardware cost of the demagnetization circuit jumper.

[0143] For other structures of the fault detection device for the demagnetization circuit jumper of the excitation system described in this embodiment, refer to the prior art.

[0144] Example 3

[0145] The present invention also discloses an electronic device, at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor. When the at least one processor executes the instructions, the following steps are specifically implemented: a current transformer is connected in series to a jumper circuit; the current transformer collects the current passing through the demagnetization circuit jumper and outputs the secondary side current; the secondary side current of the current transformer is input into a rectification and energy storage circuit to obtain a detection voltage; the detection voltage is compared with a voltage reference value through a comparison circuit to output a comparison result; if the comparison result is abnormal, an abnormal signal is sent to an excitation regulator through a signal output circuit; and a logical judgment is performed in the excitation regulator to determine whether the demagnetization circuit jumper is faulty.

[0146] Example 4

[0147] The present invention also discloses a storage medium storing a computer program. When the computer program is executed by a processor, the following steps are specifically implemented: a current transformer is connected in series to a jumper loop; the current transformer collects the current passing through the demagnetization loop jumper and outputs the secondary current; the secondary current of the current transformer is input into a rectification and energy storage loop to obtain a detection voltage; the detection voltage is compared with a voltage reference value through a comparison loop to output a comparison result; if the comparison result is abnormal, an abnormal signal is sent to an excitation regulator through a signal output loop; and a logical judgment is performed in the excitation regulator to determine whether the demagnetization loop jumper is faulty.

[0148] The present disclosure may be a method, an apparatus, a system and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for executing various aspects of the present disclosure.

[0149] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0150] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0151] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, Java, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0152] Various aspects of the present disclosure are described herein with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer-readable program instructions.

[0153] These computer-readable program instructions can be provided to a processing unit of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processing unit of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0154] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operating steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0155] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to multiple embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a part of a module, program segment or instruction, and a part of the above-mentioned module, program segment or instruction includes one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of special hardware and computer instructions.

[0156] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A fault detection method for a demagnetization circuit jumper of an excitation system, characterized in that: The detection circuit includes an excitation regulator, a current transformer, a jumper circuit, a rectification and energy storage circuit, a comparison circuit and a signal output circuit. The specific detection steps are as follows: Connect the current transformer in series to the jumper loop; The current transformer collects the current passing through the demagnetization circuit jumper and outputs the secondary current, including: The jumper circuit includes a nonlinear resistor GB, a reverse thyristor V1, a forward thyristor V2, a current transformer CT and a generator rotor L; wherein the current transformer is a common electromagnetic through-core current transformer; When the jumper is demagnetized normally, the current flowing through the current transformer is direct current; If direct current passes through the primary side of the current transformer, the current transformer will enter a magnetic saturation state and no continuous current will be generated on the secondary side; When the jumper fails, the current flowing through the current transformer is pulsating DC or AC; If a pulsating current or alternating current passes through the primary side of the current transformer, the current transformer will not enter a magnetic saturation state, and current will be generated on the secondary side; Obtain the current generated by the secondary side of the current transformer; Input the secondary side current of the current transformer into the rectification and energy storage circuit to obtain the detection voltage; The detection voltage is compared with the voltage reference value through a comparison circuit to output a comparison result; If the comparison result is abnormal, an abnormal signal is sent to the excitation regulator through the signal output circuit; A logical judgment is performed in the excitation regulator to determine whether the demagnetization circuit jumper is faulty, which specifically includes the following sub-steps: The excitation regulator executes a decision logic based on the comparison result information; The abnormal signal from the signal output circuit is collected an average of 6 times in one cycle; If a total of 60 abnormal signals from the signal output circuit are detected within 10 consecutive cycles, it is considered that the de-excitation circuit jumper is faulty; If the number of abnormal signals detected from the signal output circuit is less than 60 within 10 consecutive cycles, it is considered that the demagnetization circuit jumper is operating normally.

2. The fault detection method for the demagnetization circuit jumper of the excitation system according to claim 1 is characterized in that: The comparison circuit compares the detection voltage with the voltage reference value to output a comparison result, specifically including: Obtaining a preset voltage reference value; Electrically isolate the excitation regulator and detection circuit; The detection voltage is compared with the voltage reference value through a comparison circuit; Get the comparison result information output by the comparison circuit.

3. A fault detection device for a demagnetization circuit jumper of an excitation system, characterized in that: The detection circuit includes an excitation regulator, a current transformer, a jumper circuit, a rectification and energy storage circuit, a comparison circuit and a signal output circuit, specifically including: A detection preparation module, used for connecting the current transformer in series to the jumper loop; The current acquisition module is used to enable the current transformer to collect the current passing through the demagnetization circuit jumper and output the secondary side current, specifically including: The jumper circuit includes a nonlinear resistor GB, a reverse thyristor V1, a forward thyristor V2, a current transformer CT and a generator rotor L; wherein the current transformer is a common electromagnetic through-core current transformer; When the jumper is demagnetized normally, the current flowing through the current transformer is direct current; If direct current passes through the primary side of the current transformer, the current transformer will enter a magnetic saturation state and no continuous current will be generated on the secondary side; When the jumper fails, the current flowing through the current transformer is pulsating DC or AC; If a pulsating current or alternating current passes through the primary side of the current transformer, the current transformer will not enter a magnetic saturation state, and current will be generated on the secondary side; Obtain the current generated by the secondary side of the current transformer; The voltage acquisition module is used to input the secondary side current of the current transformer into the rectification and energy storage circuit to obtain the detection voltage; A voltage comparison module, used for comparing the detection voltage with the voltage reference value through a comparison loop to output a comparison result; The abnormal output module is used to send an abnormal signal to the excitation regulator through the signal output circuit if the comparison result is abnormal; The logic judgment module is used to perform logic judgment in the excitation regulator to determine whether the demagnetization circuit jumper is faulty. When the logic judgment module is running, it specifically includes the following sub-steps: The excitation regulator executes a decision logic based on the comparison result information; The abnormal signal from the signal output circuit is collected an average of 6 times in one cycle; If a total of 60 abnormal signals from the signal output circuit are detected within 10 consecutive cycles, it is considered that the de-excitation circuit jumper is faulty; If the number of abnormal signals detected from the signal output circuit is less than 60 within 10 consecutive cycles, it is considered that the demagnetization circuit jumper is operating normally.

4. The fault detection device for the demagnetization circuit jumper of the excitation system according to claim 3, characterized in that: The comparison circuit compares the detection voltage with the voltage reference value to output a comparison result, specifically including: Obtaining a preset voltage reference value; Electrically isolate the excitation regulator and the ratio detection circuit; The detection voltage is compared with the voltage reference value through a comparison circuit; Get the comparison result information output by the comparison circuit.

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