CN114089182A - Transformer fault early warning tripping method and device based on secondary wave recording - Google Patents
Transformer fault early warning tripping method and device based on secondary wave recording Download PDFInfo
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- CN114089182A CN114089182A CN202111383767.3A CN202111383767A CN114089182A CN 114089182 A CN114089182 A CN 114089182A CN 202111383767 A CN202111383767 A CN 202111383767A CN 114089182 A CN114089182 A CN 114089182A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The application discloses a transformer fault early warning tripping method and device based on secondary wave recording, wherein the method comprises the following steps: extracting a secondary protection voltage waveform through a secondary protection screen cabinet; comparing the secondary protection voltage waveform with the voltage waveform in normal operation; if the voltage drops by more than 5% and the voltage value of a certain phase is lower than the voltage values of other two phases by more than 5%, starting a fault recording signal; starting a fault recording signal, and judging whether the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of a preset numerical value, wherein the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of the preset numerical value, and then judging whether a short circuit occurs between the main transformer and the protection screen cabinet sends a tripping signal to the switch. Through the mode, the short-circuit fault between the main transformer cakes can be rapidly judged and the tripping signal is sent out.
Description
Technical Field
The application relates to the technical field of wave recording faults, in particular to a transformer fault early warning tripping method and device based on secondary wave recording.
Background
Power transformers are critical devices of the power grid which are subjected to lightning strike over-voltage attacks from the line side during transformer operation. Lightning waves often cause short-circuit faults among the coils at the head end of the transformer, and the events frequently occur in recent years in the range of a southern power grid. And then, short circuit between the blocks can be caused, so that serious faults inside the transformer are caused, and finally tripping is caused.
The existing main transformer protection mainly comprises differential protection and light and heavy gas protection. Wherein, the light and heavy gas protection is usually slow in response, and can not effectively remove the main transformer fault and prevent the fault from further development. The differential protection is sensitive, but the voltage value of the inter-cake short circuit fault caused by lightning overvoltage is reduced due to the fact that a plurality of cakes are short-circuited, but the short circuit ring still has large impedance and small short circuit current which cannot reach the setting value of 0.5Ie of the differential protection action, and the differential protection action is tripped only when the inter-cake short circuit causes inter-turn short circuit. Therefore, the existing differential protection can not effectively remove the short circuit fault between the cakes in advance.
Disclosure of Invention
The application provides a transformer fault early warning tripping method and device based on secondary wave recording, and aims to solve the problem that in the prior art, inter-cake short circuit caused by factors such as lightning wave invasion cannot be detected.
In order to solve the technical problem, the application provides a transformer fault early warning tripping method based on secondary wave recording, which comprises the following steps: extracting a secondary protection voltage waveform through a secondary protection screen cabinet; comparing the secondary protection voltage waveform with the voltage waveform in normal operation; if the voltage drops by more than 5% and the voltage value of a certain phase is lower than the voltage values of other two phases by more than 5%, starting a fault recording signal; starting a fault recording signal, and judging whether the discharge quantity of an optical fiber measurement bureau embedded in the transformer is increased beyond a preset value, if so, judging that a short circuit occurs between the cakes in the main transformer, and sending a tripping signal to the switch by the protection screen cabinet.
Optionally, when the protection screen cabinet sends a trip signal to the switch, the protection screen cabinet further includes: and sending an alarm signal to the production monitoring command system.
Optionally, extracting a secondary protection voltage waveform through a secondary protection screen cabinet includes: and extracting a oscillogram of the three-phase protection recording through a secondary protection screen cabinet, and reading a voltage amplitude effective value of the waveform.
Optionally, the inside pre-buried optical fiber measurement partial discharge of transformer has the increase that exceeds preset numerical value, then judges that main transformer is inside to take place the short circuit between the cake, include: and if the optical fiber measurement local discharge quantity pre-buried in the transformer is increased by more than 50%, judging that the short circuit between the cakes occurs in the main transformer.
In order to solve the technical problem, the application provides a transformer fault early warning trip gear based on secondary record ripples, includes: the waveform acquisition module is used for extracting a secondary protection voltage waveform through the secondary protection screen cabinet; the waveform comparison module is used for comparing the secondary protection voltage waveform with the voltage waveform in normal operation; the fault recording module is used for starting a fault recording signal when the voltage drops by more than 5% and a certain phase voltage value is lower than other two-phase voltage values by more than 5%; and the tripping signal module is used for starting a fault recording signal, and judging whether the volume of the optical fiber measurement local embedded in the transformer is increased beyond a preset value, so that the inter-cake short circuit occurs in the main transformer, and the protection screen cabinet sends a tripping signal to the switch.
Optionally, the method further comprises: and the alarm signal module is used for sending an alarm signal to the production monitoring command system when the protective screen cabinet sends a tripping signal to the switch.
Optionally, the waveform obtaining module is further configured to: and extracting a oscillogram of the three-phase protection recording through a secondary protection screen cabinet, and reading a voltage amplitude effective value of the waveform.
Optionally, the trip signal module is further configured to: and if the optical fiber measurement local discharge quantity pre-buried in the transformer is increased by more than 50%, judging that the short circuit between the cakes occurs in the main transformer.
In order to solve the technical problem, the present application provides an electronic device, which includes a memory and a processor, where the memory is connected to the processor, and the memory stores a computer program, and the computer program is executed by the processor to implement the transformer fault early warning trip method based on secondary wave recording.
In order to solve the above technical problem, the present application provides a computer-readable storage medium storing a computer program, where the computer program is executed to implement the above secondary wave recording-based transformer fault early warning trip method.
The application provides a transformer fault early warning tripping method and device based on secondary wave recording, wherein the method comprises the following steps: extracting a secondary protection voltage waveform through a secondary protection screen cabinet; comparing the secondary protection voltage waveform with the voltage waveform in normal operation; if the voltage drops by more than 5% and the voltage value of a certain phase is lower than the voltage values of other two phases by more than 5%, starting a fault recording signal; starting a fault recording signal, and judging whether the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of a preset numerical value, wherein the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of the preset numerical value, and then judging whether a short circuit occurs between the main transformer and the protection screen cabinet sends a tripping signal to the switch. Through the mode, the short-circuit fault between the main transformer cakes can be rapidly judged and the tripping signal is sent out.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a secondary recording-based transformer fault early warning tripping method according to the present application;
fig. 2 is a system schematic diagram of another embodiment of the transformer fault early warning tripping system based on secondary wave recording;
FIG. 3 is a schematic flow chart diagram illustrating another embodiment of a secondary recording based transformer fault pre-warning trip system according to the present application;
fig. 4 is a schematic structural diagram of an embodiment of a transformer fault early warning tripping device based on secondary wave recording according to the present application;
FIG. 5 is a schematic structural diagram of an embodiment of an electronic device of the present application;
FIG. 6 is a schematic structural diagram of an embodiment of a computer-readable storage medium of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present application, the transformer fault early warning trip method and apparatus based on secondary wave recording provided by the present application are further described in detail below with reference to the accompanying drawings and the detailed description.
The fault recording is a scheduling end network fault diagnosis system based on fault recording information. The fault recorder is used for a power system, can automatically and accurately record the change conditions of various electrical quantities in the processes before and after a fault when the system has the fault, and has important functions of analyzing and comparing the electrical quantities, analyzing and processing the fault, judging whether protection acts correctly or not and improving the safe operation level of the power system.
The application provides a transformer fault early warning tripping method based on secondary wave recording. Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a transformer fault early warning trip method based on secondary wave recording according to the present application,
in this embodiment, the transformer fault early warning trip method based on secondary wave recording may include steps S110 to S140, and each step is specifically as follows:
s110: and extracting the secondary protection voltage waveform through the secondary protection screen cabinet.
And extracting a oscillogram of the three-phase protection recording through a secondary protection screen cabinet, and reading a voltage amplitude effective value of the waveform.
S120: the secondary protection voltage waveform is compared to the voltage waveform during normal operation.
S130: and if the voltage drops by more than 5% and the voltage value of a certain phase is lower than the voltage values of other two phases by more than 5%, starting a fault recording signal.
S140: starting a fault recording signal, and judging whether the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of a preset numerical value, wherein the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of the preset numerical value, and then judging whether a short circuit occurs between the main transformer and the protection screen cabinet sends a tripping signal to the switch.
Specifically, the preset value can be set to 50%, and when the optical fiber measurement release amount pre-buried in the transformer is increased by more than 50%, the occurrence of inter-cake short circuit in the main transformer is judged.
In some embodiments, the protection cabinet, while sending the trip signal to the switch, further includes: and sending an alarm signal to the production monitoring command system to remind operators of paying attention.
For the following description, please refer to fig. 2-3 by way of example, fig. 2 is a system schematic diagram of another embodiment of the transformer fault early warning tripping system based on secondary wave recording according to the present application, and fig. 3 is a flow schematic diagram of another embodiment of the transformer fault early warning tripping system based on secondary wave recording according to the present application.
Firstly, extracting voltage waveform according to a protection wave recording signal in a secondary protection screen cabinet of the transformer, and comparing the voltage waveform with the voltage waveform in normal operation.
If the voltage of the high-voltage side or the low-voltage side drops by more than 5% and the value of a certain phase voltage is lower than that of other two phases by more than 5%, for example, the A, B, C three-phase voltage of the low-voltage side of 10kV of the normally operated main transformer is 6.05kV, the phase voltage of A, B at the fault time is 5.71kV, and the C-phase voltage is unchanged. Therefore, the A, B phase voltage has a change rate of 6.8% compared with normal operation and a change rate of 6.8% compared with the C phase voltage, both of which are greater than 5%, and the fault recording signal is started.
Meanwhile, the quantity of the ultra-high frequency measurement local discharge in the embedded optical fiber or the oil tank in the transformer is obviously increased by over 50 percent. And judging that a short circuit occurs between the cakes in the main transformer, sending a tripping signal to the high-low voltage side switch by the protection screen cabinet, and sending an alarm signal to a production monitoring command system to remind operators to pay attention.
Based on the above-mentioned transformer fault early warning tripping method based on secondary recording, the present application provides a transformer fault early warning tripping device based on secondary recording, please refer to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of the transformer fault early warning tripping device based on secondary recording, in this embodiment, the transformer fault early warning tripping device based on secondary recording may include:
a waveform obtaining module 410, configured to extract a secondary protection voltage waveform through a secondary protection screen cabinet;
a waveform comparison module 420 for comparing the secondary protection voltage waveform with a voltage waveform during normal operation;
the fault recording module 430 is configured to start a fault recording signal when the voltage drop exceeds 5% and a voltage value of a certain phase is lower than voltage values of other two phases by more than 5%;
and the tripping signal module 440 is used for starting a fault recording signal, and judging whether the volume of the optical fiber measurement bureau embedded in the transformer is increased beyond a preset value, so that the inter-cake short circuit is generated in the main transformer, and the protection screen cabinet sends a tripping signal to the switch.
Optionally, the transformer fault early warning trip gear based on secondary wave recording may further include:
and the alarm signal module is used for sending an alarm signal to the production monitoring command system when the protective screen cabinet sends a tripping signal to the switch.
Optionally, the waveform obtaining module 410 is further configured to: and extracting a oscillogram of the three-phase protection recording through a secondary protection screen cabinet, and reading a voltage amplitude effective value of the waveform.
Optionally, the trip signal module 440 is further configured to: and if the optical fiber measurement local discharge quantity pre-buried in the transformer is increased by more than 50%, judging that the short circuit between the cakes occurs in the main transformer.
Based on the transformer fault early warning tripping method based on secondary wave recording, the application also provides an electronic device, as shown in fig. 5, and fig. 5 is a schematic structural diagram of an embodiment of the electronic device. The electronic device 500 may comprise a memory 51 and a processor 52, the memory 51 being connected to the processor 52, the memory 51 having stored thereon a computer program, which when executed by the processor 52, implements the method of any of the embodiments described above. The steps and principles thereof have been described in detail in the above method and will not be described in detail herein.
In the present embodiment, the processor 52 may also be referred to as a Central Processing Unit (CPU). Processor 52 may be an integrated circuit chip having signal processing capabilities. The processor 52 may also be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Based on the transformer fault early warning tripping method based on secondary wave recording, the application also provides a computer readable storage medium. Referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of a computer-readable storage medium according to the present application. The computer-readable storage medium 600 has stored thereon a computer program 61, which computer program 61, when being executed by a processor, carries out the method of any of the above embodiments. The steps and principles thereof have been described in detail in the above method and will not be described in detail herein.
Further, the computer-readable storage medium 600 may also be various media that can store program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic tape, or an optical disk.
The application provides a transformer fault early warning tripping method and device based on secondary wave recording, wherein the method comprises the following steps: extracting a secondary protection voltage waveform through a secondary protection screen cabinet; comparing the secondary protection voltage waveform with the voltage waveform in normal operation; if the voltage drops by more than 5% and the voltage value of a certain phase is lower than the voltage values of other two phases by more than 5%, starting a fault recording signal; starting a fault recording signal, and judging whether the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of a preset numerical value, wherein the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of the preset numerical value, and then judging whether a short circuit occurs between the main transformer and the protection screen cabinet sends a tripping signal to the switch. Through the mode, the short-circuit fault between the main transformer cakes can be rapidly judged and the tripping signal is sent out.
It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. In addition, for convenience of description, only a part of structures related to the present application, not all of the structures, are shown in the drawings. The step numbers used herein are also for convenience of description only and are not intended as limitations on the order in which the steps are performed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A transformer fault early warning tripping method based on secondary wave recording is characterized by comprising the following steps:
extracting a secondary protection voltage waveform through a secondary protection screen cabinet;
comparing the secondary protection voltage waveform with a voltage waveform during normal operation;
if the voltage drops by more than 5% and the voltage value of a certain phase is lower than the voltage values of other two phases by more than 5%, starting a fault recording signal;
starting a fault recording signal, and judging whether the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of a preset numerical value, wherein the amplification of the optical fiber measurement local quantity pre-embedded in the transformer exceeds the increase of the preset numerical value, and then judging whether a short circuit occurs between the main transformer and the protection screen cabinet sends a tripping signal to the switch.
2. The secondary wave recording based transformer fault early warning tripping method according to claim 1, wherein the protection screen cabinet sends a tripping signal to the switch, and the method further comprises the following steps:
and sending an alarm signal to the production monitoring command system.
3. The secondary recording based transformer fault pre-warning tripping method of claim 2, wherein the extracting of the secondary protection voltage waveform by the secondary protection screen cabinet comprises:
and extracting a oscillogram of the three-phase protection recording through a secondary protection screen cabinet, and reading a voltage amplitude effective value of the waveform.
4. The secondary wave recording based transformer fault early warning tripping method according to claim 3, wherein if the optical fiber measurement release quantity pre-embedded in the transformer increases beyond a preset value, it is determined that inter-cake short circuit occurs in the main transformer, comprising:
and if the optical fiber measurement local discharge quantity pre-buried in the transformer is increased by more than 50%, judging that the short circuit between the cakes occurs in the main transformer.
5. The utility model provides a transformer fault early warning trip gear based on secondary recording, its characterized in that includes:
the waveform acquisition module is used for extracting a secondary protection voltage waveform through the secondary protection screen cabinet;
the waveform comparison module is used for comparing the secondary protection voltage waveform with a voltage waveform in normal operation;
the fault recording module is used for starting a fault recording signal when the voltage drops by more than 5% and a certain phase voltage value is lower than other two-phase voltage values by more than 5%;
and the tripping signal module is used for starting a fault recording signal, and judging whether the volume of the optical fiber measurement local embedded in the transformer is increased beyond a preset value, so that the inter-cake short circuit occurs in the main transformer, and the protection screen cabinet sends a tripping signal to the switch.
6. The transformer fault early warning tripping device based on secondary wave recording of claim 5, further comprising:
and the alarm signal module is used for sending an alarm signal to the production monitoring command system when the protective screen cabinet sends a tripping signal to the switch.
7. The secondary recording based transformer fault pre-warning trip unit of claim 6, wherein the waveform acquisition module is further configured to:
and extracting a oscillogram of the three-phase protection recording through a secondary protection screen cabinet, and reading a voltage amplitude effective value of the waveform.
8. The secondary recording based transformer fault pre-warning trip unit of claim 7, wherein the trip signal module is further configured to:
and if the optical fiber measurement local discharge quantity pre-buried in the transformer is increased by more than 50%, judging that the short circuit between the cakes occurs in the main transformer.
9. An electronic device, comprising a memory and a processor, wherein the memory is connected to the processor, and the memory stores a computer program, and the computer program is executed by the processor to implement the secondary recording-based transformer fault pre-warning tripping method according to any one of claims 1 to 4.
10. A computer-readable storage medium, wherein a computer program is stored, and when executed, the computer program implements the secondary recording-based transformer fault pre-warning tripping method according to any one of claims 1 to 4.
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| CN117761584A (en) * | 2024-02-22 | 2024-03-26 | 保定华创电气有限公司 | Fault detection method and device for power transformer, electronic equipment and medium |
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| Publication number | Publication date |
|---|---|
| CN114089182B (en) | 2023-08-18 |
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