CN112051448B - Intelligent multi-path voltage phase detector for transformer substation and control method thereof - Google Patents
Intelligent multi-path voltage phase detector for transformer substation and control method thereof Download PDFInfo
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- CN112051448B CN112051448B CN202011134023.3A CN202011134023A CN112051448B CN 112051448 B CN112051448 B CN 112051448B CN 202011134023 A CN202011134023 A CN 202011134023A CN 112051448 B CN112051448 B CN 112051448B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- G—PHYSICS
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention provides a control method of an intelligent multi-path voltage phase-checking instrument of a transformer substation, which comprises the following steps: setting a working mode, and calculating the fixed value of an overvoltage and undervoltage judging unit of the to-be-tested voltage loop; the method comprises the steps that an isolation sampling unit is used for carrying out isolation sampling on a reference voltage and a standby voltage; calculating the differential pressure of the reference voltage and the to-be-nucleated voltage, and performing intelligent fault diagnosis on the to-be-nucleated voltage loop through the differential pressure characteristic; and displaying the differential pressure waveform and the corresponding differential pressure effective value through a differential pressure waveform display unit. The invention further provides an intelligent multi-path voltage phase detector of the transformer substation. The intelligent multi-path voltage phase-checking instrument control method for the transformer substation can simultaneously check phases of secondary and three-phase voltage loops of the transformer substation, improves the phase-checking speed, and performs fault discrimination by using an overvoltage discrimination element and an undervoltage discrimination element; through the isolation sampling unit, the safety of on-site nuclear phase work of maintenance operators is effectively improved, the labor intensity of the maintenance operators is reduced, the production cost is saved, and the economic benefit of enterprises is improved.
Description
Technical Field
The invention relates to the technical field of power system detection, in particular to an intelligent multi-path voltage phase detector of a transformer substation and a control method thereof.
Background
The national power grid company takes a construction operation power grid as core business, bears basic life of guaranteeing safer, more economical, cleaner and sustainable power supply, aims to further strengthen safe and reliable operation of the power grid, carries out large-scale transformation aiming at transformer substations with long operation time and equipment aging in recent years, and often relates to primary transmission line migration and transformation of a secondary voltage loop in the transformation process, and nuclear phase work of the voltage secondary loop is needed in the power transmission process.
The existing method for nuclear phase operation of the secondary voltage loop of the transformer substation is to measure the effective value of the voltage difference between the reference voltage and the voltage to be nuclear by taking a universal meter as a tool, and judge whether the voltage loop to be nuclear has faults or not by measuring for a plurality of times and combining the working experience of technicians.
However, when the existing method is adopted for phase checking, the phase checking speed is low, the technical capability and working experience requirements of technicians are high, and if the experience of the technicians is insufficient, the problems of high misjudgment risk and the like exist; each phase of the secondary circuit of the voltage needs to be measured independently by using a voltmeter, and because of more cables in a protection screen and complex wiring of the secondary circuit, the workload is large, the working flow is complex, other secondary circuits are easy to touch by mistake, and the risks of measurement and judgment errors exist when the phase is checked by the traditional method. When the phase is checked, if the alternating voltage is wrongly adjusted to be a resistance, a short circuit occurs between the reference voltage loop and the voltage loop to be checked, so that the spare power automatic switching device can malfunction or burn out a voltage transformer, the spare power automatic switching device becomes malfunction of a transformer substation and the protection device is locked, and the related protection functions are changed to cause huge potential safety hazards for power grids and equipment. When the abnormal condition occurs in the measuring voltage loop, an maintainer needs to check each phase of the voltage secondary loop respectively and determine the abnormal reason of the voltage loop according to technical experience, so that the time for the maintainer to process faults is prolonged intangibly, and the working efficiency of the maintainer is reduced.
Therefore, it is urgent to develop a multi-path voltage phase-checking instrument capable of simplifying the transformer station voltage phase-checking work flow and reducing the working risk.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides an intelligent multi-path voltage phase detector for a transformer substation and a control method thereof.
The technical scheme of the invention is as follows:
the intelligent multi-path voltage phase detector control method for the transformer substation comprises the following steps:
setting a working mode, and calculating the fixed value of an overvoltage and undervoltage judging unit of the to-be-tested voltage loop;
the method comprises the steps that an isolation sampling unit is used for carrying out isolation sampling on a reference voltage and a standby voltage;
calculating the differential pressure of the reference voltage and the to-be-nucleated voltage, and performing intelligent fault diagnosis on the to-be-nucleated voltage loop through the differential pressure characteristic;
and displaying the differential pressure waveform and the corresponding differential pressure effective value through a differential pressure waveform display unit.
The further technical scheme of the invention is that the set working modes comprise three working modes, specifically:
a first mode, a same voltage class and a same power supply phase-locked mode;
the second mode, YD11 main transformer high-low voltage nuclear phase mode;
third mode, other core phase modes.
As a further technical scheme of the present invention, the third mode further includes setting a theoretical phase angle difference θ between the reference voltage and the phase voltage to be nucleated.
According to the further technical scheme, the overvoltage and undervoltage judging unit fixed value of the to-be-detected voltage loop is calculated; the method comprises the following steps: and calculating the fixed value of the overvoltage and undervoltage judging unit under the conditions of correct standby voltage loop, BC phase inversion, AB phase inversion, AC phase inversion and L phase inversion according to the set working mode.
According to the further technical scheme, the differential pressure of the reference voltage and the to-be-nucleated voltage is calculated, and intelligent fault diagnosis is carried out on the to-be-nucleated voltage loop through the differential pressure characteristic; the method specifically comprises the following steps:
judging whether the effective values of the three-phase voltage to be tested are all larger than a first set threshold value in a set working mode, and if not, outputting a corresponding phase loop voltage abnormal signal;
if yes, judging whether the effective value of the zero-phase voltage of the standby power voltage is smaller than a second set threshold value, and if not, outputting a zero-phase loop voltage abnormal signal;
if yes, judging whether the voltage difference effective value of the three-phase and zero-phase voltages is between the undervoltage fixed value of each phase and the overvoltage fixed value of each phase, and if not, outputting a corresponding phase loop voltage error signal;
if yes, judging that the waiting nuclear power voltage loop is correct.
As a further technical scheme of the invention, the first set threshold value is 30V, and the second set threshold value is 20V.
According to the technical scheme, the ABC three-phase undervoltage constant value of the first mode is 0V, the overvoltage constant value is 25V, and the L-phase overvoltage constant value is 15V;
according to the technical scheme, the ABC three-phase undervoltage constant value of the second mode is 18V, the overvoltage constant value is 42V, and the L-phase overvoltage constant value is 15V;
the method for calculating and setting the undervoltage and overvoltage constant values in the third mode is characterized by utilizing the phase angle difference theta set in the third mode and combining the formula:
The invention also provides an intelligent multi-path voltage phase detector of the transformer substation, which comprises:
the parameter setting unit is used for setting a working mode and calculating the fixed value of the overvoltage and undervoltage judging unit under different wiring conditions of the to-be-tested voltage loop;
the isolation sampling unit is used for carrying out isolation sampling on the reference voltage and the standby voltage;
the overvoltage and undervoltage judging unit is used for calculating the differential pressure between the reference voltage and the nucleated voltage and performing intelligent fault diagnosis on the circuit of the voltage to be nucleated through the differential pressure characteristics;
the differential pressure waveform display unit is used for displaying differential pressure waveforms and corresponding differential pressure effective values.
The beneficial effects of the invention are as follows:
the intelligent multi-path voltage phase-checking instrument control method for the transformer substation can simultaneously perform phase checking on a secondary three-phase voltage loop of the transformer substation, realize multi-path phase checking, simplify phase checking flow, improve phase checking speed, and effectively avoid the risk of misjudgment of the voltage phase checking caused by artificial factors such as experience deficiency by utilizing the overvoltage judging element and the undervoltage judging element to judge faults through the voltage waveform characteristics of different fault types of the voltage loop;
the intelligent multipath voltage phase checking instrument of the transformer substation effectively isolates the inside of the measuring instrument from the secondary voltage loop of the transformer substation through the isolating sampling unit, no matter the inside of the measuring instrument is connected in parallel or in series, the secondary voltage loop of the transformer substation can not be influenced, the safety of the on-site phase checking work of maintenance operators is effectively improved, the time for the maintenance operators to handle faults is reduced, the labor intensity of the maintenance operators is reduced, the production cost of enterprises is saved, and the economic benefit of the enterprises is improved.
Drawings
FIG. 1 is a flow chart of a control method of an intelligent multi-path voltage phase detector of a transformer substation;
FIG. 2 is a flow chart of an embodiment of the present invention;
FIG. 3 is a flow chart for discriminating fault types of intelligent multi-path voltage phase-checking instruments of a transformer substation;
FIG. 4a is a waveform characteristic diagram of a reference voltage when a nuclear voltage loop is correct during nuclear phase of uniform voltage class according to the invention;
FIG. 4b is a waveform characteristic diagram of the to-be-tested voltage when the to-be-tested voltage loop is correct during the unified voltage class phase test according to the invention;
FIG. 4c is a graph showing the waveform characteristics of the differential pressure when the nuclear voltage loop is correct during the nuclear phase of the unified voltage class according to the present invention;
FIG. 5a is a graph showing the waveform characteristics of a reference voltage when the phase of a nuclear voltage loop BC is reversed during the nuclear phase of the unified voltage class according to the present invention;
FIG. 5b is a diagram of the waveform characteristics of the standby voltage when the standby voltage loops BC are connected reversely during the unified voltage class phase inversion of the invention;
FIG. 5c is a graph showing the waveform characteristics of the differential pressure when the nuclear voltage loop BC is reversed during the nuclear phase of the unified voltage class according to the present invention;
FIG. 6a is a graph showing the waveform characteristics of a reference voltage when the phase of a nuclear voltage loop AB is reversed during nuclear phase of uniform voltage class according to the present invention;
FIG. 6b is a waveform characteristic diagram of the standby voltage when the standby voltage loop AB is connected reversely during the unified voltage class phase inversion of the invention;
FIG. 6c is a graph showing the waveform characteristics of the differential pressure when the nuclear voltage loop AB is inverted during the nuclear phase of the unified voltage class according to the present invention;
FIG. 7a is a graph of reference voltage waveform characteristics of a nuclear voltage loop AC phase reversal to be seen during nuclear phase of uniform voltage class in accordance with the present invention;
FIG. 7b is a diagram showing the waveform characteristics of the to-be-tested voltage when the AC of the to-be-tested voltage loop is reversed during the to-be-tested voltage loop phase of the unified voltage class;
FIG. 7c is a graph of differential pressure waveform characteristics of the unified voltage class nuclear phase of the present invention when the AC phase of the nuclear power voltage loop is reversed;
FIG. 8a is a waveform characteristic diagram of a reference voltage when a nuclear voltage loop is correct during nuclear phase of YD11 main transformer high and low voltages;
FIG. 8b is a waveform characteristic diagram of the to-be-nuclear power voltage when the to-be-nuclear power voltage circuit is correct during the high-low voltage nuclear phase of the YD11 main transformer of the invention;
FIG. 8c is a graph showing the waveform characteristics of the differential pressure when the nuclear voltage loop is correct during the nuclear phase of YD11 main transformer;
FIG. 9a is a waveform characteristic diagram of a reference voltage when a nuclear voltage loop BC is connected reversely during nuclear phase of YD11 main transformer high and low voltage of the invention;
FIG. 9b is a waveform characteristic diagram of the to-be-nuclear power voltage when the to-be-nuclear power voltage circuit BC is connected reversely when the YD11 main transformer is in a high-low voltage nuclear phase;
FIG. 9c is a graph showing the waveform characteristics of the differential pressure when the nuclear voltage loop BC is reversed during the nuclear phase of YD11 main transformer;
FIG. 10a is a waveform characteristic diagram of a reference voltage when the nuclear voltage loop AB is connected reversely during the nuclear phase of YD11 main transformer high and low voltage of the invention;
FIG. 10b is a waveform characteristic diagram of the to-be-nuclear power voltage circuit AB when the to-be-nuclear power voltage circuit AB is connected reversely during the high-low voltage nuclear phase of the YD11 main transformer of the invention;
FIG. 10c is a graph showing the waveform characteristics of the differential pressure when the nuclear voltage loop AB is connected reversely when the YD11 main transformer is in the high-low voltage nuclear phase;
FIG. 11a is a waveform characteristic diagram of a reference voltage when the AC phase of a nuclear voltage loop is reversed during nuclear phase of YD11 main transformer;
FIG. 11b is a waveform characteristic diagram of the to-be-nuclear power voltage loop AC phase inversion when the YD11 main transformer is in high-low voltage nuclear phase;
FIG. 11c is a graph showing the waveform characteristics of the differential pressure when the AC phase of the nuclear voltage loop is reversed during the nuclear phase of YD11 main transformer;
fig. 12 is a control structure diagram of the intelligent multi-path voltage phase detector of the transformer substation.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart of a control method of an intelligent multi-path voltage phase detector of a transformer substation according to the present invention; FIG. 2 is a flow chart of an embodiment of the present invention;
as shown in fig. 1 and 2, the intelligent multi-path voltage phase detector control method for the transformer substation comprises the following steps:
102, performing isolation sampling on a reference voltage and a standby voltage through an isolation sampling unit;
The invention provides an intelligent multi-path nuclear phase instrument for a transformer substation, which can realize simultaneous measurement of multi-path reference voltage and nuclear voltage to be tested, and can intelligently judge the fault type of a nuclear voltage loop to be tested by taking an overvoltage judging element and an undervoltage judging element as decision units through different differential pressure characteristics, so that the misjudgment of the nuclear phase caused by insufficient experience of technicians is effectively avoided, the working efficiency of the nuclear phase is greatly improved, in addition, the secondary voltage loop and a measuring instrument of the transformer substation are effectively isolated by using an isolation sampling element, and the malfunction risk brought to a transformer substation protection device by incorrect use of the instrument is avoided.
In the embodiment of the invention, the overvoltage and undervoltage judging unit can be completed by combining the analog-digital conversion unit with a processor with a logic judging function; the differential pressure waveform display can select other modules with display functions, such as a full-color display screen.
In the embodiment of the invention, the working modes are set, and the working modes comprise three working modes, specifically:
a first mode, a same voltage class and a same power supply phase-locked mode;
the second mode, YD11 main transformer high-low voltage nuclear phase mode;
third mode, other core phase modes.
The third mode further comprises setting a theoretical phase angle difference theta between the reference voltage and the phase voltage to be nucleated.
In step 103, calculating the fixed value of an overvoltage and undervoltage judging unit of the standby voltage loop; the method comprises the following steps: and calculating the fixed value of the overvoltage and undervoltage judging unit under the conditions of correct standby voltage loop, BC phase inversion, AB phase inversion, AC phase inversion and L phase inversion according to the set working mode.
In the embodiment of the invention, the mode setting element is used for setting the mode, the mode setting element is mainly used for carrying out mode setting, the mode setting element mainly comprises a nuclear phase mode of the same voltage level with the mode code of M01, a YD11 main transformer high-low voltage nuclear phase mode with the mode code of M02 and other nuclear phase modes with the mode code of M03, wherein the theoretical phase angle difference theta between the reference voltage and the voltage of the to-be-nuclear phase is required to be set after the M03 mode is determined, the fixed values of the overvoltage and undervoltage distinguishing elements under different conditions such as correct circuit of the to-be-nuclear voltage, reverse phase BC, reverse phase AB, reverse phase AC phase and L phase error are calculated through the parameter setting element, the sampling element is used for carrying out isolation sampling on the reference voltage and the to-be-nuclear voltage, differential pressure calculation is carried out in the instrument, the intelligent fault diagnosis of the to-be-nuclear voltage circuit is carried out through the differential pressure characteristic and the intelligent distinguishing element is formed by the overvoltage distinguishing element and the undervoltage distinguishing element, and the differential pressure waveform display element and the corresponding differential pressure effective value display are carried out, and the operation personnel can know the differential pressure condition of the different voltage circuits intuitively. The difference values and the effective values of the different fault types in the three modes are shown in table 1:
table 1 3 differential pressure amplitudes and effective values for different fault types in modes
Reference voltages of Ua, ub, uc modes M01 and M02, voltages to be verified of different fault types and corresponding differential voltage waveforms are shown in fig. 4 to 11.
Referring to fig. 3, in step 104, a differential pressure between a reference voltage and a voltage to be nucleated is calculated, and intelligent fault diagnosis is performed on a circuit of the voltage to be nucleated through the differential pressure characteristics; the method specifically comprises the following steps:
judging whether the effective values of the three-phase voltage to be tested are all larger than a first set threshold value in a set working mode, and if not, outputting a corresponding phase loop voltage abnormal signal;
if yes, judging whether the effective value of the zero-phase voltage of the standby power voltage is smaller than a second set threshold value, and if not, outputting a zero-phase loop voltage abnormal signal;
if yes, judging whether the voltage difference effective value of the three-phase and zero-phase voltages is between the undervoltage fixed value of each phase and the overvoltage fixed value of each phase, and if not, outputting a corresponding phase loop voltage error signal;
if yes, judging that the waiting nuclear power voltage loop is correct.
Wherein the first set threshold is 30V and the second set threshold is 20V.
In the embodiment of the invention, the ABC three-phase undervoltage constant value of the first mode is 0V, the overvoltage constant value is 25V, and the L-phase overvoltage constant value is 15V;
the ABC three-phase undervoltage constant value of the second mode is 18V, the overvoltage constant value is 42V, and the L-phase overvoltage constant value is 15V;
the undervoltage and overvoltage fixed value calculation and setting method of the third mode is to use the phase angle difference theta set in the third mode and combine the formula:
The fault type of the voltage loop to be tested can be obtained through logic judgment of the undervoltage and overvoltage judging element, fault alarm code information is displayed through digital transistor rotation, in addition, the differential pressure waveform display element can intuitively display differential pressure waveforms and effective values of each phase, and technicians can double confirm the fault information through the differential pressure waveforms and combining working experience.
The invention can realize the intelligent nuclear phase of the multi-path voltage in the transformer substation, effectively isolate the secondary voltage loop of the transformer from the instrument during the nuclear phase, and intelligently identify the fault type of the to-be-detected voltage loop through the waveform characteristics of the multi-path voltage difference.
The intelligent multi-path voltage phase-checking instrument control method for the transformer substation can simultaneously check phases of secondary and three-phase voltage loops of the transformer substation, realizes multi-path phase checking, simplifies phase checking flow, improves phase checking speed, and effectively avoids the risk of misjudgment of the voltage phase checking caused by artificial factors such as insufficient experience by utilizing the overvoltage judging element and the undervoltage judging element to judge faults through the voltage waveform characteristics of different fault types of the voltage loops;
the intelligent multipath voltage phase checking instrument of the transformer substation effectively isolates the inside of the measuring instrument from the secondary voltage loop of the transformer substation through the isolating sampling unit, no matter the inside of the measuring instrument is connected in parallel or in series, the secondary voltage loop of the transformer substation can not be influenced, the safety of the on-site phase checking work of maintenance operators is effectively improved, the time for the maintenance operators to handle faults is reduced, the labor intensity of the maintenance operators is reduced, the production cost of enterprises is saved, and the economic benefit of the enterprises is improved.
Referring to fig. 12, the present invention further provides an intelligent multi-path voltage phase detector of a transformer substation, including:
the parameter setting unit 201 is used for setting a working mode and calculating the fixed value of the overvoltage and undervoltage judging unit of the to-be-tested voltage loop;
the isolation sampling unit 202 is used for performing isolation sampling on the reference voltage and the standby voltage;
the overvoltage and undervoltage judging unit 203 is configured to calculate a differential pressure between the reference voltage and the nucleated voltage, and perform intelligent fault diagnosis on the circuit to be nucleated voltage through the differential pressure characteristic;
the differential pressure waveform display unit 204 is used for displaying differential pressure waveforms and corresponding differential pressure effective values.
Various variations and specific examples of the control method of the intelligent multi-path voltage phase-checking device of the transformer substation in the first embodiment are applicable to the intelligent multi-path voltage phase-checking device of the transformer substation in this embodiment, and those skilled in the art can clearly know the intelligent multi-path voltage phase-checking device of the transformer substation in this embodiment through the foregoing detailed description of the control method of the intelligent multi-path voltage phase-checking device of the transformer substation, so that the detailed description is omitted herein for brevity.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart 1 flowchart and/or block diagram 1 or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart 1 flowchart and/or block diagram 1 or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart 1 flowchart and/or block diagram 1 or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and a person skilled in the art may still make modifications and equivalents to the specific embodiments of the present invention with reference to the above embodiments, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as filed herewith.
Claims (5)
1. The intelligent multi-path voltage phase detector control method for the transformer substation is characterized by comprising the following steps of:
setting a working mode, and calculating the fixed value of an overvoltage and undervoltage judging unit of the to-be-tested voltage loop;
the method comprises the steps that an isolation sampling unit is used for carrying out isolation sampling on a reference voltage and a standby voltage;
calculating the differential pressure of the reference voltage and the to-be-nucleated voltage, and performing intelligent fault diagnosis on the to-be-nucleated voltage loop through the differential pressure characteristic;
displaying the differential pressure waveform and the corresponding differential pressure effective value through a differential pressure waveform display unit;
the set working modes comprise three working modes, and specifically comprise:
a first mode, a same voltage class and a same power supply phase-locked mode;
the second mode, YD11 main transformer high-low voltage nuclear phase mode;
a third mode, which further comprises setting a theoretical phase angle difference between the reference voltage and the phase voltage to be nucleated;
the overvoltage and undervoltage judging unit for calculating the overvoltage and undervoltage judging unit fixed value of the standby voltage loop; the method comprises the following steps: calculating the fixed value of the overvoltage and undervoltage judging unit under the conditions of correct standby voltage loop, BC phase inversion, AB phase inversion, AC phase inversion and L phase inversion according to the set working mode;
the differential pressure of the reference voltage and the to-be-nucleated voltage is calculated, and intelligent fault diagnosis is carried out on the to-be-nucleated voltage loop through the differential pressure characteristic; the method specifically comprises the following steps:
judging whether the effective values of the three-phase voltage to be tested are all larger than a first set threshold value in a set working mode, and if not, outputting a corresponding phase loop voltage abnormal signal;
if yes, judging whether the effective value of the zero-phase voltage of the standby power voltage is smaller than a second set threshold value, and if not, outputting a zero-phase loop voltage abnormal signal;
if yes, judging whether the voltage difference effective value of the three-phase and zero-phase voltages is between the undervoltage fixed value of each phase and the overvoltage fixed value of each phase, and if not, outputting a corresponding phase loop voltage error signal;
if yes, judging that the waiting nuclear power voltage loop is correct.
2. The method of claim 1, wherein the first set threshold is 30V and the second set threshold is 20V.
3. The method of claim 1, wherein the first mode ABC three phase under voltage set point is 0V, the over voltage set point is 25V, and the l phase over voltage set point is 15V.
4. The method of claim 1, wherein the second mode has an ABC three-phase under-voltage rating of 18V, an over-voltage rating of 42V, and an l-phase over-voltage rating of 15V.
5. The intelligent multi-path voltage phase nuclear meter of a transformer substation according to any one of claims 1-4, comprising:
the parameter setting unit is used for setting a working mode and calculating the fixed value of the overvoltage and undervoltage judging unit under different wiring conditions of the to-be-tested voltage loop;
the isolation sampling unit is used for carrying out isolation sampling on the reference voltage and the standby voltage;
the overvoltage and undervoltage judging unit is used for calculating the differential pressure between the reference voltage and the nucleated voltage and performing intelligent fault diagnosis on the circuit of the voltage to be nucleated through the differential pressure characteristics;
the differential pressure waveform display unit is used for displaying differential pressure waveforms and corresponding differential pressure effective values.
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| CN205786876U (en) * | 2016-06-27 | 2016-12-07 | 国网甘肃省电力公司白银供电公司 | A kind of general phase-difference type switch cabinet phasing device |
| CN207263834U (en) * | 2017-06-13 | 2018-04-20 | 徐州阳光送变电有限公司 | A kind of long-range nuclear phase instrument system |
| CN109655676A (en) * | 2018-11-29 | 2019-04-19 | 国网山东省电力公司日照供电公司 | A kind of method of electric power nuclear phase |
| CN109738714A (en) * | 2019-03-20 | 2019-05-10 | 国家电网有限公司 | The method and device of secondary nuclear phase |
| CN110514912A (en) * | 2019-09-10 | 2019-11-29 | 上海交通大学 | A kind of secondary voltage kernel phase system |
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