CN113721181A - Self-shunt excitation PT slow-fusing fault judgment method - Google Patents
Self-shunt excitation PT slow-fusing fault judgment method Download PDFInfo
- Publication number
- CN113721181A CN113721181A CN202110893548.3A CN202110893548A CN113721181A CN 113721181 A CN113721181 A CN 113721181A CN 202110893548 A CN202110893548 A CN 202110893548A CN 113721181 A CN113721181 A CN 113721181A
- Authority
- CN
- China
- Prior art keywords
- voltage
- judgment
- signal
- module
- slow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/74—Testing of fuses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a self-shunt PT slow-fusing fault judgment method. The method comprises the following steps: acquiring data of each terminal voltage of the monitoring equipment, comparing the data of each terminal voltage, comparing the data with a preset threshold value to obtain a judgment result, sending a judgment signal by combining with an OR gate logic module for analysis, and outputting the obtained analysis signal from a signal outlet by combining with an AND gate logic module for delay module linkage. The invention has the advantages that: the invention rebuilds the logic, the terminal voltage of the standby channel is added with the comparison voltage, and the terminal voltage of the standby channel and the synchronous voltage of the channel are combined to form an OR gate, two groups of comparison voltage fixed values can be respectively and independently set, the method can judge the fault more quickly and accurately, and the fault judgment can be adjusted more flexibly according to the fault judgment. A delay module is added at an outlet, so that the overvoltage accident of a generator or a system caused by the mistaken forced excitation of an excitation system is effectively avoided, and the reliability of fault judgment is improved. The invention can quickly and accurately position the fault, saves the fault processing time, and has strong adaptability and wide application range.
Description
Technical Field
The invention relates to the technical field of judgment of generator excitation systems, in particular to a self-shunt excitation PT slow-fusing fault judgment method.
Background
The excitation system of the generator is a power supply for supplying the excitation current of the generator and a system of accessory equipment thereof, generally comprises an excitation power unit and an excitation regulator, and is combined with a voltage transformer to carry out real-time excitation regulation.
Firstly, the method comprises the following steps: the excitation power unit provides excitation current for the rotor of the synchronous generator;
II, secondly: the excitation regulator controls the output of the excitation power unit according to the input signal and a given regulation criterion;
thirdly, the method comprises the following steps: the voltage transformer (PT) is an important approach for inputting a voltage signal into the excitation regulator.
And a safety is arranged on a loop of the voltage transformer and used for isolating an internal fault of the voltage transformer or a short-circuit fault between the voltage transformer and an external connecting wire.
However, in the actual operation of the generator, the fuse of the voltage transformer is slowly fused, so that the excitation regulator judges that the voltage signal is lost, at this time, the excitation system controls the excitation power unit to continuously increase the excitation to improve the supply of the excitation current to the rotor of the synchronous generator in order to maintain the constant terminal voltage, and the continuous increase of the excitation can cause the VHz limiter (limit of the ratio of the voltage to the frequency) or the OEL limiter (over-excitation limit) to act and even cause the generator trip accident.
In the existing excitation regulation judging logic, two faults of channel voltage loss and PT disconnection are judged only through a single judging basis, and the condition that a fuse of a voltage transformer PT is slowly fused cannot be judged quickly and accurately because the judged fixed value cannot be adjusted.
In summary, a more reasonable and accurate determination scheme for determining the disconnection of the voltage transformer needs to be provided for the problem of slow fuse of the voltage transformer.
Disclosure of Invention
The invention aims to overcome the defects of judgment logic of an excitation system of the existing generator and provides a self-shunt excitation PT slow-fusing fault judgment method which is more reasonable in design, more accurate and flexible in judgment and higher in fault judgment reliability.
In order to solve the technical problems, the invention adopts the technical scheme that:
a self-shunt PT slow fuse fault determination method, the method comprising:
s1: the acquisition module simultaneously acquires the voltage of the end of the operating channel, the voltage of the end of the standby channel and the synchronous voltage, acquires the voltage of the end of the operating channel, acquires the voltage of the end of the standby channel for detecting the voltage of the operating channel in the unit, and acquires the synchronous voltage for detecting the voltage of the operating standby channel in the unit, and the synchronous voltage is the synchronous voltage of the excitation system;
s2: comparing the obtained standby channel terminal voltage with the obtained operation channel terminal voltage by a first judgment module to obtain a first voltage difference value, comparing the first voltage difference value with a first threshold value to obtain a first judgment result, comparing the obtained synchronous voltage with the obtained operation channel terminal voltage by a second judgment module to obtain a second voltage difference value, and comparing the second voltage difference value with a second threshold value to obtain a second judgment result;
s3: the OR gate logic module receives the first judgment result and the second judgment result and sends a pre-judgment signal to the AND gate logic module according to the first judgment result and the second judgment result;
s4: the processor simultaneously transmits the excitation input signal and the excitation system signal to the AND gate logic module, and the AND gate logic module carries out logic judgment according to the received prejudgment signal, the excitation input signal and the excitation system signal to output an analysis signal;
s5: the analysis signal is sent to the delay module, and the delay module sends the analysis signal to the signal output outlet when continuously receiving the analysis signal according to the preset delay value.
Preferably, when the voltage at the end of the standby channel and the voltage at the end of the operating channel are obtained to be high, the first judgment module compares the voltage at the end of the standby channel and the voltage at the end of the operating channel to obtain a first voltage difference value which is a positive value, and when the first voltage difference value exceeds a first threshold value, the first judgment result is obtained to judge that the fuse of the voltage transformer is in slow fusing.
Preferably, when the obtained synchronous voltage is higher than the obtained voltage at the end of the operating channel, the second judgment module compares the obtained synchronous voltage with the obtained voltage at the end of the operating channel to obtain a second voltage difference value which is a positive value, and when the second voltage difference value exceeds a second threshold, the obtained second judgment result is to judge the fuse wire breakage of the voltage transformer.
Preferably, when the obtained synchronous voltage and the obtained operating channel terminal voltage are low, the second judgment module compares the obtained synchronous voltage with the obtained operating channel terminal voltage to obtain a second voltage difference value which is a negative value, and when the second voltage difference value exceeds a second threshold value, the obtained second judgment result is that the channel voltage is lost.
Preferably, the first threshold is a preset voltage difference amplitude of 3% -5%, and the second threshold is a preset voltage difference amplitude of 3% -5%.
Preferably, the and gate logic module combines the prejudgment signal output by the or gate logic module with the excitation input signal and the excitation system signal, and sends the slow melting signal acquired by the voltage transformer to the delay module.
Preferably, the delay module continuously receives a normal signal of the voltage transformer, and the analysis signal is output as a continuous normal working signal.
Preferably, the delay module continuously receives a fuse slow fusing signal of the voltage transformer when exceeding a preset delay value, and the analysis signal is a PT fusing signal.
Preferably, the preset delay value of the delay module is 2 s.
Preferably, the signal output outlet is a voltage transformer status output outlet.
Compared with the prior art, the invention has the following gain effects:
1. the invention applies that the newly built logic is added with the terminal voltage of the standby channel in combination with the terminal voltage of the channel and the synchronous voltage to form an OR gate, two groups of comparison voltage fixed values can be respectively and independently set, and the logic of the judgment method judges and detects the slow-melting fault of the voltage transformer by comparing the terminal voltage or the terminal voltage of the main and standby channels of the excitation system with the synchronous voltage.
2. According to the invention, the delay module is added at the outlet, so that the condition that the voltage transformer is judged to be slowly molten by mistake under the condition of accidental shaking during sampling of the voltage transformer is avoided, the overvoltage accident of a generator or a system caused by the mistaken forced excitation of an excitation system is effectively avoided, and the reliability of fault judgment is improved.
3. The invention can monitor the working state of the fuse of the terminal voltage transformer in real time in the operation process of the large-scale generator set, can quickly and accurately position the fault under the fault condition, saves time for fault processing of operators, avoids fault expansion, effectively ensures the operation safety of equipment, can comprehensively and effectively monitor various abnormal conditions at the generator terminal, improves the operation safety of the generator set, and has strong adaptability and wide application range.
Drawings
FIG. 1 is a logic diagram of fuse slow-fusing determination for a voltage transformer according to the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
To further clarify the objects, features and functions of the present invention, a review board will be provided by referring to the following description of the preferred embodiments in conjunction with the accompanying drawings:
referring to fig. 1, the present invention is a self-shunt PT slow fusing fault determining method, including:
s1: the acquisition module simultaneously acquires the voltage of the terminal of the operating channel, the voltage of the terminal of the standby channel and the synchronous voltage,
acquiring an operating channel terminal voltage, acquiring a standby channel terminal voltage for detecting the voltage of a channel in an operating state in a unit, and acquiring a synchronous voltage for detecting the voltage of the standby channel in the operating state in the unit, wherein the synchronous voltage is the synchronous voltage of an excitation system;
s2: comparing the obtained standby channel terminal voltage with the obtained operation channel terminal voltage by a first judgment module to obtain a first voltage difference value, comparing the first voltage difference value with a first threshold value to obtain a first judgment result, comparing the obtained synchronous voltage with the obtained operation channel terminal voltage by a second judgment module to obtain a second voltage difference value, and comparing the second voltage difference value with a second threshold value to obtain a second judgment result;
s3: the OR gate logic module receives the first judgment result and the second judgment result and sends a pre-judgment signal to the AND gate logic module according to the first judgment result and the second judgment result;
s4: the processor simultaneously transmits the excitation input signal and the excitation system signal to the AND gate logic module, and the AND gate logic module carries out logic judgment according to the received prejudgment signal, the excitation input signal and the excitation system signal to output an analysis signal;
s5: the analysis signal is sent to the delay module, and the delay module sends the analysis signal to the signal output outlet when continuously receiving the analysis signal according to the preset delay value.
In this embodiment, when the voltage at the end of the standby channel and the voltage at the end of the operating channel are obtained and high, the first determining module compares the voltage at the end of the standby channel and the voltage at the end of the operating channel to obtain a first voltage difference value, which is a positive value, and when the first voltage difference value exceeds a first threshold value, the first determining module determines that the fuse of the voltage transformer is in slow fusing.
In this embodiment, when the obtained synchronous voltage is higher than the obtained voltage at the end of the operating channel, the second determining module compares the obtained synchronous voltage with the obtained voltage at the end of the operating channel to obtain a second voltage difference value, which is a positive value, and when the second voltage difference value exceeds a second threshold, the obtained second determining result is to determine disconnection of the fuse of the voltage transformer.
In this embodiment, when the obtained synchronization voltage and the obtained operating channel terminal voltage are low, the second determining module compares the obtained synchronization voltage and the obtained operating channel terminal voltage to obtain a second voltage difference value, which is a negative value, and when the second voltage difference value exceeds a second threshold, the obtained second determining result is determined as the channel voltage loss.
In this embodiment, the first threshold is a preset voltage difference amplitude of 3% to 5%, and the second threshold is a preset voltage difference amplitude of 3% to 5%.
In this embodiment, the and gate logic module combines the prejudgment signal output by the or gate logic module with the excitation input signal and the excitation system signal, and sends the slow melting signal acquired by the voltage transformer to the delay module.
In this embodiment, the delay module continuously receives a normal signal of the voltage transformer, and the analysis signal is output as a continuous normal working signal.
In this embodiment, the delay module continuously receives a fuse slow fusing signal of the voltage transformer when exceeding a preset delay value, and the analysis signal is a PT fusing signal.
In this embodiment, the preset delay value of the delay module is 2 s.
In this embodiment, the signal output outlet is a voltage transformer status output outlet.
Example 1:
in this embodiment, the obtaining module obtains the voltage at the end of the standby channel, the voltage at the end of the operating channel, and the synchronous voltage of the excitation system at the same time.
Firstly, the first judgment module compares the acquired standby channel terminal voltage with the acquired operating channel terminal voltage, and when the acquired standby channel terminal voltage and the acquired operating channel terminal voltage are high but the first voltage difference value does not exceed a first threshold value (3% -5% of voltage difference amplitude), the first judgment module judges that the motor works normally and does not output signals to the OR gate logic module.
And then, the second judgment module compares the obtained synchronous voltage with the obtained voltage at the end of the operating channel, and judges that the motor works normally and does not output a signal to the OR gate logic module when the obtained synchronous voltage is high or the obtained synchronous voltage is low at the end of the operating channel but the second voltage difference value does not exceed a second threshold value (3-5% of voltage difference amplitude).
The OR gate logic module does not receive the signal output by the first judgment module or the second judgment module, does not act, and the excitation system keeps the original excitation control mode to carry out excitation regulation.
Example 2:
in this embodiment, the obtaining module obtains the voltage at the end of the standby channel, the voltage at the end of the operating channel, and the synchronous voltage of the excitation system at the same time.
Firstly, a first judgment module compares the voltage at the end of the acquired standby channel with the voltage at the end of the acquired operation channel, when the voltage at the end of the acquired standby channel is high and the voltage at the end of the acquired operation channel is high, a first voltage difference value obtained by subtraction is a positive value, and when the first voltage difference value exceeds a first threshold value (3% -5% of voltage difference amplitude), the first judgment module obtains a first judgment result and judges that the fuse wire of the voltage transformer is in slow melting, and outputs a pre-judgment slow melting signal to an OR gate logic module.
And then, the second judgment module compares the obtained synchronous voltage with the obtained voltage at the end of the operating channel, and judges that the motor works normally and does not output a signal to the OR gate logic module when the obtained synchronous voltage is high or the obtained synchronous voltage is low at the end of the operating channel but the second voltage difference value does not exceed a second threshold value (3-5% of voltage difference amplitude).
When the OR gate logic module receives a signal of a first judgment result, a corresponding pre-judgment signal is transmitted to the AND gate logic module, meanwhile, the processor sends an excitation input signal and an excitation system signal to the AND gate logic module, when the AND gate logic module simultaneously receives the three signals, the AND gate logic module analyzes the signals and then sends an analysis signal to the delay module, when the delay module continuously receives the same analysis signal within the time of a preset delay value of 2s, the delay module outputs the analyzed slow-melting signal of the voltage transformer to the signal output port, the PT measurement data of the generator is activated to be invalid, and when the PT is locked and disconnected, partial functions in the excitation system are closed.
Example 3:
in this embodiment, the obtaining module obtains the voltage at the end of the standby channel, the voltage at the end of the operating channel, and the synchronous voltage of the excitation system at the same time.
Firstly, the first judgment module compares the acquired standby channel terminal voltage with the acquired operating channel terminal voltage, and when the acquired standby channel terminal voltage and the acquired operating channel terminal voltage are high but the first voltage difference value does not exceed a first threshold value (3% -5% of voltage difference amplitude), the first judgment module judges that the motor works normally and does not output signals to the OR gate logic module.
And then, the second judgment module compares the obtained synchronous voltage with the obtained operating channel terminal voltage, when the obtained synchronous voltage is low in voltage of the obtained operating channel terminal, the obtained difference value of the second voltage is a negative value, and when the difference value of the second voltage exceeds a second threshold (3% -5% of voltage difference amplitude), the second judgment module obtains a second judgment result and judges that the channel voltage is lost, and outputs a pre-judgment channel voltage loss signal to the OR gate logic module.
When the OR gate logic module receives a signal of a second judgment result, a corresponding pre-judgment signal is transmitted to the AND gate logic module, meanwhile, the processor sends an excitation input signal and an excitation system signal to the AND gate logic module, when the AND gate logic module simultaneously receives the three signals, the AND gate logic module analyzes the three signals and then sends an analysis signal to the delay module, when the delay module continuously receives the same analysis signal within the time of a preset delay value of 2s, the delay module outputs the analyzed voltage loss signal to the signal output outlet, the excitation system adopts an excitation control mode of magnetization increasing regulation according to the received voltage loss signal, and the excitation regulator performs system excitation regulation processing on the excitation power unit to maintain the voltage at the generator terminal to be constant.
Example 4:
in this embodiment, the obtaining module obtains the voltage at the end of the standby channel, the voltage at the end of the operating channel, and the synchronous voltage of the excitation system at the same time.
Firstly, a first judgment module compares the voltage at the end of the acquired standby channel with the voltage at the end of the acquired operation channel, when the voltage at the end of the acquired standby channel is high and the voltage at the end of the acquired operation channel is high, a first voltage difference value obtained by subtraction is a positive value, and when the first voltage difference value exceeds a first threshold value (3% -5% of voltage difference amplitude), the first judgment module obtains a first judgment result and judges that the fuse wire of the voltage transformer is in slow melting, and outputs a pre-judgment slow melting signal to an OR gate logic module.
And then, the second judgment module compares the obtained synchronous voltage with the obtained operating channel terminal voltage, when the obtained synchronous voltage is low in voltage of the obtained operating channel terminal, the obtained difference value of the second voltage is a negative value, and when the difference value of the second voltage exceeds a second threshold (3% -5% of voltage difference amplitude), the second judgment module obtains a second judgment result and judges that the channel voltage is lost, and outputs a pre-judgment channel voltage loss signal to the OR gate logic module.
When the OR gate logic module receives signals of the first judgment result and the second judgment result, corresponding pre-judgment signals are transmitted to the AND gate logic module, meanwhile, the processor sends excitation input signals and excitation system signals to the AND gate logic module, when the signals are simultaneously received by the AND gate logic module, the AND gate logic module analyzes the signals and then sends analysis signals to the delay module, when the delay module continuously receives the pre-judgment slow melting signals within the time of a preset delay value of 2s, the delay module outputs the analyzed voltage transformer slow melting signals to the signal output port, PT measurement data of the generator are activated to be invalid, and when PT disconnection is locked, partial functions in the excitation system are closed.
Example 5:
in this embodiment, the obtaining module obtains the voltage at the end of the standby channel, the voltage at the end of the operating channel, and the synchronous voltage of the excitation system at the same time.
Firstly, the first judgment module compares the acquired standby channel terminal voltage with the acquired operating channel terminal voltage, and when the acquired standby channel terminal voltage and the acquired operating channel terminal voltage are high but the first voltage difference value does not exceed a first threshold value (3% -5% of voltage difference amplitude), the first judgment module judges that the motor works normally and does not output signals to the OR gate logic module.
And then, the second judgment module compares the obtained synchronous voltage with the obtained voltage at the end of the operation channel, when the obtained synchronous voltage is high, the obtained synchronous voltage is subtracted from the obtained voltage at the end of the operation channel to obtain a second voltage difference value which is a positive value, and when the second voltage difference value exceeds a second threshold (3% -5% of voltage difference amplitude), the second judgment module obtains a second judgment result which is used for judging the fuse wire breakage of the voltage transformer and outputs a pre-judgment PT wire breakage signal to the OR gate logic module.
When the OR gate logic module receives a signal of a second judgment result, a corresponding pre-judgment signal is transmitted to the AND gate logic module, meanwhile, the processor sends an excitation input signal and an excitation system signal to the AND gate logic module, when the conditions that the AND gate logic module receives the three signals simultaneously are met, the AND gate logic module analyzes the three signals and then sends an analysis signal to the delay module, and when the delay module continuously receives the same analysis signal within the time of a preset delay value of 2s, the delay module outputs the analyzed PT disconnection signal to a signal output outlet and sends an alarm signal.
Example 6:
in this embodiment, the obtaining module obtains the voltage at the end of the standby channel, the voltage at the end of the operating channel, and the synchronous voltage of the excitation system at the same time.
Firstly, a first judgment module compares the voltage at the end of the acquired standby channel with the voltage at the end of the acquired operation channel, when the voltage at the end of the acquired standby channel is high and the voltage at the end of the acquired operation channel is high, a first voltage difference value obtained by subtraction is a positive value, and when the first voltage difference value exceeds a first threshold value (3% -5% of voltage difference amplitude), the first judgment module obtains a first judgment result and judges that the fuse wire of the voltage transformer is in slow melting, and outputs a pre-judgment slow melting signal to an OR gate logic module.
And then, the second judgment module compares the obtained synchronous voltage with the obtained voltage at the end of the operation channel, when the obtained synchronous voltage is high, the obtained synchronous voltage is subtracted from the obtained voltage at the end of the operation channel to obtain a second voltage difference value which is a positive value, and when the second voltage difference value exceeds a second threshold (3% -5% of voltage difference amplitude), the second judgment module obtains a second judgment result which is used for judging the fuse wire breakage of the voltage transformer and outputs a pre-judgment PT wire breakage signal to the OR gate logic module.
When the OR gate logic module receives signals of the first judgment result and the second judgment result, corresponding pre-judgment signals are transmitted to the AND gate logic module, meanwhile, the processor sends an excitation input signal and an excitation system signal to the AND gate logic module, when the conditions that the AND gate logic module receives the three signals at the same time are met, the AND gate logic module analyzes the three signals and then sends an analysis signal to the delay module, when the delay module continuously receives the same analysis signal within the time of a preset delay value of 2s, the delay module outputs the analyzed slow melting signal of the voltage transformer to the signal output port, the PT measurement data of the generator is activated to be invalid, and when the PT disconnection is locked, partial functions in the excitation system are closed.
In the invention, when the terminal voltage of the standby channel is higher than the terminal voltage of the operating channel, the difference value exceeds a set value (preset to be 3-5%), or the synchronous voltage of the channel is higher than the terminal voltage of the operating channel, the difference value exceeds the set value (preset to be 3-5%), the standby channel passes through an AND gate outlet and a delay module (preset to be 2s), and the standby channel passes through an external PT disconnection interface. A delay module is added in front of an outlet, so that the condition that PT slow melting is judged by mistake under the condition that PT sampling is jittered is avoided, and the reliability of fault judgment is improved.
The setting values of the first threshold and the second threshold are set according to a rule, the difference between the starting value of the limiter and the rated pole voltage per unit (100%) is not exceeded VHz, and a 2-3% margin is reserved. If the VHz limiter is set to 106%, then the first and second thresholds should be set to 4% -5%.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A self-shunt PT slow fuse fault judgment method is characterized by comprising the following steps:
s1: the acquisition module simultaneously acquires the voltage of the terminal of the operating channel, the voltage of the terminal of the standby channel and the synchronous voltage,
obtaining the terminal voltage of the operating channel to detect the voltage of the channel in the operating state,
obtaining the terminal voltage of the standby channel to detect the voltage of the standby channel in the running state in the unit,
acquiring synchronous voltage which is the synchronous voltage of an excitation system;
s2: comparing the obtained standby channel terminal voltage with the obtained operating channel terminal voltage by a first judgment module to obtain a first voltage difference value, comparing the first voltage difference value with a first threshold value to obtain a first judgment result,
comparing the obtained synchronous voltage with the obtained voltage at the end of the operating channel by a second judgment module to obtain a second voltage difference value, and comparing the second voltage difference value with a second threshold value to obtain a second judgment result;
s3: the OR gate logic module receives the first judgment result and the second judgment result and sends a pre-judgment signal to the AND gate logic module according to the first judgment result and the second judgment result;
s4: the processor simultaneously transmits the excitation input signal and the excitation system signal to the AND gate logic module, and the AND gate logic module carries out logic judgment according to the received prejudgment signal, the excitation input signal and the excitation system signal to output an analysis signal;
s5: the analysis signal is sent to the delay module, and the delay module sends the analysis signal to the signal output outlet when continuously receiving the analysis signal according to the preset delay value.
2. The self-shunt-excited PT slow-fusing fault judgment method as claimed in claim 1, wherein when the obtained standby channel terminal voltage and the obtained operating channel terminal voltage are high, the first judgment module compares the obtained standby channel terminal voltage with the obtained operating channel terminal voltage to obtain a first voltage difference value which is a positive value, and the first voltage difference value exceeds a first threshold, and obtains a first judgment result as judgment that the fuse of the voltage transformer is slow-fusing.
3. The self-shunt-excited PT slow-fusing fault judgment method as claimed in claim 1, wherein when the obtained synchronous voltage is higher than the obtained voltage at the end of the operating channel, the second judgment module compares the obtained synchronous voltage with the obtained voltage at the end of the operating channel to obtain a second voltage difference value, which is a positive value, and the second voltage difference value exceeds a second threshold, and obtains a second judgment result as a judgment of a fuse wire breakage of the voltage transformer.
4. The self-shunt PT slow fusing fault determination method of claim 1, wherein when the obtained synchronous voltage and the obtained operating channel terminal voltage are low, the second determination module compares the obtained synchronous voltage and the obtained operating channel terminal voltage to obtain a second voltage difference value, which is a negative value, and the second voltage difference value exceeds a second threshold, the second determination result is obtained and is determined as a channel voltage loss.
5. The self-shunt-excited PT slow fusing fault determination method as claimed in claims 1-4, wherein the first threshold is a preset voltage difference amplitude of 3% -5%, and the second threshold is a preset voltage difference amplitude of 3% -5%.
6. The self-shunt excitation PT slow fusing fault judgment method according to claim 1, wherein the AND gate logic module combines a pre-judgment signal output by the OR gate logic module with an excitation input signal and an excitation system signal, and sends a slow fusing signal acquired by a voltage transformer to the delay module.
7. The self-shunt PT slow fusing fault determination method of claim 1, wherein the delay module continuously receives a normal signal of a voltage transformer, and the analysis signal is output as a continuous normal operation signal.
8. The self-shunt PT slow fusing fault determination method of claim 1, wherein the delay module continuously receives a fuse slow fusing signal of a voltage transformer beyond a preset delay value, and the analysis signal is a PT fusing signal.
9. The self-shunt PT slow fuse fault determination method according to one of claims 1, 7 or 8, characterized in that the preset delay value of the delay module is 2 s.
10. The self-shunt PT slow fusing fault determination method of claim 1, wherein the signal output outlet is a voltage transformer status output outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110893548.3A CN113721181A (en) | 2021-08-04 | 2021-08-04 | Self-shunt excitation PT slow-fusing fault judgment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110893548.3A CN113721181A (en) | 2021-08-04 | 2021-08-04 | Self-shunt excitation PT slow-fusing fault judgment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113721181A true CN113721181A (en) | 2021-11-30 |
Family
ID=78674893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110893548.3A Pending CN113721181A (en) | 2021-08-04 | 2021-08-04 | Self-shunt excitation PT slow-fusing fault judgment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113721181A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115061534A (en) * | 2022-05-09 | 2022-09-16 | 厉雷刚 | Clock-free asynchronous circuit, method, apparatus and medium for synchronous data output |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541469A (en) * | 2019-01-09 | 2019-03-29 | 中国长江电力股份有限公司 | A kind of generator excited system PT broken string method of discrimination |
| CN111650542A (en) * | 2020-07-07 | 2020-09-11 | 国电大渡河瀑布沟发电有限公司 | Detection device and method for preventing slow fusing of generator set terminal voltage transformer fuse |
| CN112595995A (en) * | 2019-09-16 | 2021-04-02 | 天津睿信创和电气有限公司 | PT (potential Transformer) disconnection fault detection unit of automatic excitation device and working method thereof |
| CN112881906A (en) * | 2021-01-04 | 2021-06-01 | 国家能源集团国源电力有限公司 | Fault judgment method and device and control terminal |
-
2021
- 2021-08-04 CN CN202110893548.3A patent/CN113721181A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541469A (en) * | 2019-01-09 | 2019-03-29 | 中国长江电力股份有限公司 | A kind of generator excited system PT broken string method of discrimination |
| CN112595995A (en) * | 2019-09-16 | 2021-04-02 | 天津睿信创和电气有限公司 | PT (potential Transformer) disconnection fault detection unit of automatic excitation device and working method thereof |
| CN111650542A (en) * | 2020-07-07 | 2020-09-11 | 国电大渡河瀑布沟发电有限公司 | Detection device and method for preventing slow fusing of generator set terminal voltage transformer fuse |
| CN112881906A (en) * | 2021-01-04 | 2021-06-01 | 国家能源集团国源电力有限公司 | Fault judgment method and device and control terminal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115061534A (en) * | 2022-05-09 | 2022-09-16 | 厉雷刚 | Clock-free asynchronous circuit, method, apparatus and medium for synchronous data output |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN87103164A (en) | The solid state instantaneous trip apparatus of current limiting circuit breaker | |
| CN110190588A (en) | Breaker intelligent monitoring and protective module | |
| CN104599901B (en) | Detection circuit used for contactor | |
| CN212989624U (en) | Self-checking circuit suitable for direct current injection type rotor ground protection measurement loop | |
| CN101803136A (en) | Differential protection method, system and device | |
| CN113721181A (en) | Self-shunt excitation PT slow-fusing fault judgment method | |
| CN106640691A (en) | Device and method for water pump fault testing and protecting | |
| CN109347060B (en) | A kind of differential error protection control method of aviation power system | |
| CN114563733A (en) | Alternating current leakage detection system and method supporting power supply mode conversion and vehicle | |
| CN110112703A (en) | Protect circuit | |
| CN111628526B (en) | Grid-connected control method based on multiple buses and multiple contactors | |
| CN111693820A (en) | Fault point detection device and method for mine power transmission cable | |
| CN112290516A (en) | Overvoltage protection system, method and device based on bus and outgoing line polarity characteristics | |
| CN113589023A (en) | Method and device for rapidly detecting single set of abnormal alternating current measurement of redundant system | |
| CN208723536U (en) | A kind of electromotor integrated protection system for extractive equipment | |
| CN106340954A (en) | Method for identifying line breaking of power supply line and switching to standby power supply | |
| JP2012199393A (en) | Distribution cable for solar cell module and large scale solar power generation system and solar power generation apparatus that use the distribution cable | |
| CN115534677A (en) | Short-circuit protection method for high-voltage circuit | |
| CN212540592U (en) | Remote control device for fault recording equipment | |
| CN114355104A (en) | Low-current grounding line selection method, system and device | |
| CN210041312U (en) | Over-voltage and under-voltage protection circuit | |
| CN209072381U (en) | Excitation system | |
| CN113147477A (en) | Management system for power distribution unit of high-power direct-current charger | |
| CN208224401U (en) | Connect the connection circuit of equipment | |
| CN111181249A (en) | Multi-power-supply parallel synchronization method, control power supply, electric control device and purifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |