CN106771645A - Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system - Google Patents
Capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system Download PDFInfo
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Abstract
The invention discloses a kind of capacitance type potential transformer dielectric loss and capacitance on-line monitoring method and monitoring system, bus PT secondary voltages are obtained by voltage/current monitoring device, capacitance type potential transformer secondary voltage, piezoelectricity capacitance current in capacitance type potential transformer, voltage transformer intermediate transformer primary current, and calculated the data is activation of acquisition to data processing equipment, obtain capacitance type potential transformer high-voltage capacitance dielectric loss value, high-tension electricity capacity, middle voltage capacitance dielectric loss value, middle piezoelectricity capacity, so as to realize the automatic on-line monitoring to capacitance type potential transformer dielectric loss and capacitance, explicit physical meaning, measurement result is accurate, be conducive to that the abort situation of capacitance type potential transformer is accurately judged and positioned.Simultaneously, it is to avoid dismounting capacitance type potential transformer high pressure lead, the workload of in-site measurement is reduced, and all test jobs can be carried out in the case where not having a power failure, and power system normal power supply is not influenceed.
Description
Technical Field
The invention relates to the technical field of power equipment performance monitoring, in particular to an on-line monitoring method and a monitoring system for dielectric loss and capacitance of a capacitor voltage transformer.
Background
Both voltage transformers and transformers are used to transform the voltage on the line. However, the purpose of voltage transformation by the transformer is to transmit electric energy, and the purpose of voltage transformation by the voltage transformer is mainly to supply power to the measuring instrument and the relay protection device. In recent years, Capacitor Voltage Transformers (CVTs) are increasingly used in power systems, but the capacitance change and the Voltage division ratio change caused by insulation aging problems of the Capacitor Voltage transformers during use directly affect the accuracy of measurement of measuring instruments and the stability of operation of relay protection devices, the fairness of measurement and the safety of equipment.
Electric power industry standard DL/T596 "preventive test procedure for Electrical Equipment": the capacitance value and the dielectric loss tangent (tan) of the capacitor voltage transformer are periodically tested. On one hand, the regular test rules may not find out the fault defect in time when no fault occurs, so that the equipment is damaged or the hidden trouble of the fault is left; on the other hand, unnecessary maintenance may be performed, increasing costs. Therefore, the method has important significance for on-line monitoring of the capacitor voltage transformer, timely prediction and diagnosis of faults, and guarantee of normal operation of electrical equipment, improvement of reliability of a power grid, reduction of operation cost and protection of safety of equipment and operators.
The current measuring method of the capacitor voltage transformer mainly comprises a high-voltage capacitor bridge method, a dielectric loss instrument-based measuring method and an online monitoring method. The high-voltage capacitance bridge method is to utilize bridge balance to measure capacitance value, and has the advantages of simple method, easy realization and relatively high precision, but because the high-voltage capacitance bridge method is an analog method, the high-voltage capacitance bridge method is easily interfered by external electromagnetic field in a test site, so that the bridge cannot be balanced, and the measurement error is relatively large. After that, the improved methods of the high-voltage capacitance bridge method, such as the shielding method, the phase-shifting method, etc., are proposed, but the problem of large measurement error still cannot be solved. The high-voltage bridge, the step-up transformer and the standard capacitor are integrated into a whole based on a dielectric loss instrument measuring method, and the test can be independently completed without other external equipment.
Disclosure of Invention
The invention aims to solve the technical problems of on-line and accurate monitoring of dielectric loss and capacitance of a capacitor voltage transformer and further reduction of on-site measurement workload, and aims to provide an on-line monitoring method and a monitoring system for dielectric loss and capacitance of the capacitor voltage transformer, which solve the problems of large measurement workload, influence on normal power supply of a power system, inaccurate measurement, large error, inaccurate fault location and ambiguous physical meaning of the current measurement method.
The invention is realized by the following technical scheme:
the capacitance voltage transformer dielectric loss and capacitance online monitoring method comprises the following steps:
A. monitoring signals of bus PT secondary voltage, capacitor voltage transformer secondary voltage, voltage capacitor current in a voltage transformer and primary current of a capacitor voltage transformer intermediate transformer;
B. carrying out Fourier analysis on signals of bus PT secondary voltage, capacitor voltage transformer medium-voltage capacitor current and medium-voltage capacitor current to obtain the amplitude, frequency and phase of the signals, wherein the phase angle of bus PT secondary voltage fundamental wave component is defined asThe amplitude is defined as Uz1The phase angle of the fundamental component of the secondary voltage of the capacitor voltage transformer is defined asThe amplitude is defined as Uz2The phase angle of the fundamental component of the medium-voltage capacitive current of the voltage transformer is defined asThe amplitude is defined as Ic2The phase angle of the primary current fundamental component of the intermediate transformer of the capacitor voltage transformer is defined asThe amplitude is defined as Ib；
C. Calculating the vectors of the high-voltage capacitor voltage, the high-voltage capacitor current and the medium-voltage capacitor voltage of the voltage transformer according to the formula 1Obtaining the amplitude, frequency and phase of the signal, wherein the fundamental wave phase angle of the voltage of the high-voltage capacitor of the voltage transformer is defined asAmplitude definitionIs Uc1The fundamental phase angle of the high-voltage capacitor current is defined asThe amplitude is defined as Ic1, and the fundamental phase of the medium-voltage capacitor voltage is defined asThe amplitude is defined as Uc2The formula 1 specifically includes:
wherein, L is inductance value and K of compensating reactor of capacitor voltage transformer1To actual transformation ratio of bus PT, K2The actual transformation ratio of the intermediate transformer of the capacitor voltage transformer is obtained;
D. calculating the dielectric loss value tan of the voltage transformer according to the formula 2xAnd a capacitance CxEquation 2 specifically includes:
when x is 1, calculating to obtain a dielectric loss value tan of the high-voltage capacitor of the capacitor voltage transformer1And high-voltage capacitance C of capacitor voltage transformer1(ii) a When x is 2, calculating to obtain the dielectric loss value tan of the medium voltage capacitor of the capacitor voltage transformer2And medium voltage capacitance C of capacitor voltage transformer2；
E. And transmitting the dielectric loss and the capacitance of the capacitor voltage transformer to a local server through a switch.
In particular, said step B is: carrying out Fourier analysis on signals of bus PT secondary voltage, capacitor voltage transformer medium-voltage capacitor current and medium-voltage capacitor current to obtain the amplitude, frequency and phase of the signals, wherein the bus PT secondary voltage is subjected to fundamental wave divisionThe phase angle of the quantity is defined asThe amplitude is defined as Uz1The phase angle of the fundamental component of the secondary voltage of the capacitor voltage transformer is defined asThe amplitude is defined as Uz2The phase angle of the fundamental component of the medium-voltage capacitive current of the voltage transformer is defined asThe amplitude is defined as Ic2The phase angle of the primary current fundamental component of the intermediate transformer of the capacitor voltage transformer is defined asThe amplitude is defined as IbCorrecting the phase of the fundamental wave component of the PT secondary voltage of the bus according to the formula 3 to obtain the corrected phase angle of the fundamental wave component of the PT secondary voltage of the busCorrecting the phase of the secondary voltage fundamental component of the capacitor voltage transformer according to a formula 4 to obtain the corrected phase angle of the secondary voltage fundamental component of the capacitor voltage transformerThe formula 3 and the formula 4 are specifically:
wherein,the phase error value for the period calibration of the bus PT can be obtained by performing an error test on the bus PT,the phase error value for periodic calibration of the voltage transformer to be tested can be obtained by performing error test on the voltage transformer to be tested.
In particular, the capacitance voltage transformer dielectric loss and capacitance online monitoring method further comprises a step F,
F. and the weather station sends the weather data to the local server through the switch.
The capacitance voltage transformer dielectric loss and capacitance on-line monitoring system comprises a voltage/current monitoring device, a data processing device, a clock synchronization device, a switch and a local server, wherein,
the voltage/current monitoring device is electrically connected with the bus PT and the capacitor voltage transformer and is used for obtaining a secondary voltage signal and a current signal of the bus PT and a secondary voltage signal and a current signal of the capacitor voltage transformer and sending the secondary voltage signal and the current signal to the data processing device;
the data processing device is connected with the voltage/current monitoring device through an optical fiber and is used for analyzing and calculating voltage and current signals sent by the voltage/current monitoring device to obtain dielectric loss and capacitance of the capacitive voltage transformer;
the clock synchronization device is connected with the voltage/current monitoring device and the data processing device through optical fibers and is used for providing a synchronization clock for the voltage/current monitoring device and the data processing device;
the local server is connected with the data processing device through the switch, is externally connected with the remote server through a network, and is used for transmitting the monitored dielectric loss and capacitance information of the capacitor voltage transformer to the remote server.
Particularly, the voltage/current monitoring device comprises a voltage acquisition module, a current acquisition module, a signal processing module, an A/D conversion module, a CPU and an I/O interface module.
In particular, the voltage acquisition module adopts a 0.01-level high-precision non-inductive platinum resistor.
Particularly, the current acquisition module adopts a 0.02-level passive zero-flux current transformer which adopts a core-through multi-turn mode.
In particular, the communication between the local server and the switch adopts IEC61850-9-2LE protocol.
Particularly, the capacitance voltage transformer dielectric loss and capacitance online monitoring system further comprises a weather station, and the weather station is electrically connected with the switch.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the capacitance voltage transformer dielectric loss and capacitance online monitoring method and the monitoring system can realize automatic online monitoring of the capacitance voltage transformer high-voltage capacitance, the medium-voltage capacitance dielectric loss and capacitance, have definite physical significance and accurate measurement result, avoid disassembling and assembling a high-voltage primary lead wire of the capacitance voltage transformer, reduce the workload of field measurement, can be carried out under the condition of no power failure in all test works, and do not influence the normal power supply of a power system. Meanwhile, the weather station installed on site can monitor environmental parameters including temperature, and provides important reference for researching dielectric loss and change rule between capacitance and the environmental parameters of the capacitor voltage transformer. Meanwhile, the local server and the switch are communicated by adopting an IEC61850-9-2LE protocol, and information can be shared and exchanged with intelligent equipment of the intelligent substation supporting the IEC61850-9-2LE protocol.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a circuit structure block diagram of an on-line dielectric loss and capacitance monitoring system for a capacitor voltage transformer according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of an on-line monitoring method for dielectric loss and capacitance of a capacitor voltage transformer according to embodiment 2 of the present invention.
Fig. 3 is a schematic diagram of a capacitor voltage transformer circuit provided in embodiment 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, fig. 1 is a circuit structure block diagram of an on-line dielectric loss and capacitance monitoring system for a capacitor voltage transformer according to embodiment 1 of the present invention.
The capacitance voltage transformer dielectric loss and capacitance on-line monitoring system comprises a voltage/current monitoring device, a data processing device, a clock synchronization device, a switch and a local server.
The voltage/current monitoring device is electrically connected with the bus PT and the voltage transformer, obtains a secondary voltage signal and a current signal of the bus PT and a secondary voltage signal and a current signal of the capacitor voltage transformer, and sends the secondary voltage signal and the current signal to the data processing device, and specifically comprises a voltage acquisition module, a current acquisition module, a signal processing module, an A/D conversion module, a CPU and an I/O interface module. The voltage acquisition module adopts a 0.01-level high-precision non-inductive platinum resistor to acquire bus PT secondary voltage Uz1And each phase of the bus PT and the capacitor voltage transformer is respectively connected with a non-inductive platinum resistor in parallel for voltage division, and all the non-inductive platinum resistors have the same temperature coefficient, so that the voltage acquisition module is not influenced by temperature change and has high measurement accuracy. The current is adoptedThe collection module adopts a 0.02-level passive zero-flux current transformer to collect medium-voltage capacitor current of the capacitor voltage transformer and primary current of the intermediate transformer of the capacitor voltage transformer, the current transformer adopts a core-through multi-turn mode to improve the intensity of induced current, and a shielding shell and a shielding cable are adopted, so that the current collection module is high in anti-interference capability, high in safety and reliability and high in measurement accuracy. By adopting the voltage acquisition module and the current acquisition module, more accurate voltage and current values can be acquired, so that the dielectric loss and capacitance value of the voltage transformer obtained by calculating the acquired voltage and current values are accurate, the measurement result of the monitoring device is accurate, and faults can be timely and accurately found. The signal processing module is electrically connected with the voltage acquisition module and the current acquisition module, conditions the acquired voltage and current signals into a level range which can be received by the A/D conversion module, and sends the level range to the A/D conversion module, and meanwhile, the signal processing module plays roles of isolation and protection. The A/D conversion module is electrically connected with the signal processing module, converts the analog signals sent by the signal processing module into digital signals and sends the digital signals to the CPU. The CPU is electrically connected with the A/D conversion module, packages the digital signals into messages meeting the national network FT3, converts the digital electric signals into optical signals through the I/O interface module, and sends the messages to the data processing device.
The data processing device is connected with the voltage/current monitoring device through optical fibers, analyzes and calculates voltage and current signals sent by the voltage/current monitoring device to obtain dielectric loss and capacitance of the voltage transformer, and particularly adopts a CPU.
The clock synchronization device is connected with the voltage/current monitoring device and the data processing device through optical fibers, provides a synchronization clock for the voltage/current monitoring device and the data processing device, ensures that data processed by the data processing device and the current/voltage monitoring device are parameters at the same moment, and particularly adopts an FPGA.
The local server is connected with the data processing device through the switch, monitoring information is uploaded to the local server, meanwhile, the server can be uploaded to a user through a network, and the user further monitors the operation data of the capacitive voltage transformer through an interactive interface. The monitoring information includes: the transformer comprises a bus PT secondary voltage, a capacitor voltage transformer medium-voltage capacitor current, a capacitor voltage transformer intermediate transformer primary current, a capacitor voltage transformer high-voltage capacitor voltage, a high-voltage capacitor current and medium-voltage capacitor voltage, a capacitor voltage transformer high-voltage capacitor dielectric loss value and capacitance, and a medium-voltage capacitor dielectric loss value and capacitance.
A preferred implementation of this embodiment is that the capacitance voltage transformer dielectric loss and capacitance online monitoring system further includes a weather station, the weather station is electrically connected with the switch, monitors weather data such as temperature, humidity, wind speed, rainfall and illuminance in the station in real time, and uploads the weather data to the local server through the switch, so that the server can further study the capacitance voltage transformer dielectric loss and capacitance change rule under different weather conditions.
The capacitance voltage transformer dielectric loss and capacitance online monitoring system adopts a typical digital substation architecture, the data format of communication between the local server and the switch adopts an IEC61850-9-2LE protocol, and information sharing and exchange can be realized with intelligent equipment of an intelligent substation supporting the IEC61850-9-2LE protocol.
Example 2
The embodiment discloses an on-line monitoring method for dielectric loss and capacitance of a capacitor voltage transformer.
Fig. 2 is a flowchart of an on-line monitoring method for dielectric loss and capacitance of a capacitor voltage transformer according to embodiment 2 of the present invention.
The method for monitoring the dielectric loss and the capacitance of the capacitive voltage transformer on line specifically comprises the following steps:
s101, monitoring bus PT secondary voltage, capacitor voltage transformer medium-voltage capacitor current and capacitor voltage transformer intermediate transformer primary current.
As shown in fig. 3, fig. 3 is a schematic diagram of a capacitor voltage transformer circuit provided in embodiment 2 of the present invention.
Wherein, C1Is a high-voltage capacitor of a capacitor voltage transformer, C2The voltage transformer is a medium-voltage capacitor of a capacitor voltage transformer, T1 is a same-phase bus PT, T2 is a middle transformer of the capacitor voltage transformer, and L is a compensation reactor of the capacitor voltage transformer. The voltage/current monitoring device voltage acquisition module acquires bus PT secondary voltage, capacitor voltage transformer medium voltage capacitor current and capacitor voltage transformer intermediate transformer primary current signals, converts the acquired analog quantity signals into digital quantity signals, and transmits the digital quantity signals to the data processing device through optical fibers in an FT3 format. The voltage acquisition module is adopted, particularly, the 0.01-level high-precision non-inductive platinum resistor is adopted to acquire the bus PT secondary voltage and the capacitor voltage transformer secondary voltage, all the non-inductive platinum resistors have the same temperature coefficient, the oscillation is small, the stability is good, and therefore the voltage value acquired by the voltage acquisition module is stable and accurate; adopt current acquisition module, concrete adoption 0.02 level passive zero magnetic flux current transformer gathers capacitance voltage transformer middling pressure electric capacity current and capacitance voltage transformer intermediate transformer primary current, current transformer adopts the mode of punching multiturn to improve induced current intensity to adopt shielding shell and shielded cable, the interference killing feature is strong, and fail safe nature is high, and measurement accuracy is high, so the current numerical value that current acquisition module gathered is stable, accurate. Meanwhile, the A/D conversion module performs on-site digital processing on the voltage and current signals acquired by the voltage acquisition module and the current acquisition module, converts the analog quantity signals into digital quantity signals and transmits the digital quantity signals to the data processing device, so that the analog quantity signals are prevented from being influenced by electromagnetic interference in the transmission process, and the measurement precision of the whole device is further improved.
S102, carrying out Fourier analysis on signals of the secondary voltage of the bus PT, the secondary voltage of the capacitor voltage transformer, the medium-voltage capacitor current of the capacitor voltage transformer and the medium-voltage capacitor current to obtain the amplitude, the frequency and the phase of the signals.
And the data processing device performs Fourier analysis on signals of the secondary voltage of the bus PT, the secondary voltage of the voltage transformer, the medium-voltage capacitor current of the voltage transformer and the primary current of the intermediate transformer of the voltage transformer to obtain the amplitude, the frequency and the phase of the signals. Wherein the phase angle of the fundamental component of the secondary voltage of the bus PT is defined asThe amplitude is defined as Uz1The phase angle of the fundamental component of the secondary voltage of the capacitor voltage transformer is defined asThe amplitude is defined as Uz2The phase angle of the fundamental component of the medium-voltage capacitive current of the voltage transformer is defined asThe amplitude is defined as Ic2The phase angle of the primary current fundamental component of the intermediate transformer of the capacitor voltage transformer is defined asThe amplitude is defined as Ib. Compared with the traditional FFT, the Fourier analysis algorithm is not limited by the fact that the signal frequency is required to be integral multiple of the frequency resolution, has good spectrum analysis characteristics, and can effectively inhibit spectrum leakage; in the multi-spectral line range of the energy center, the phase invariance of the signal initial phase is realized, the phase measurement precision can be obviously improved, and the measurement precision of the whole device is further improved.
S103, calculating vectors of the high-voltage capacitor voltage, the high-voltage capacitor current and the medium-voltage capacitor voltage of the voltage transformer according to the formula 1The amplitude, frequency and phase of the signal are obtained.
Obtaining a formula 1 according to a schematic diagram of a capacitor voltage transformer circuit shown in fig. 3, where the formula 1 is specifically:
the data processing device calculates the vector of the high-voltage capacitor voltage, the high-voltage capacitor current and the medium-voltage capacitor voltage of the voltage transformer according to the formula 1Wherein,is a vector of the secondary voltage of the bus PT,Is the vector of the secondary voltage of the capacitor voltage transformer,Is the vector of the medium voltage capacitance current of the voltage transformer,Is the vector of the primary current of the intermediate transformer of the voltage transformer, L is the inductance value of the compensating reactor of the voltage transformer, K1To actual transformation ratio of bus PT, K2Is the actual transformation ratio of the intermediate transformer of the voltage transformer, obtained by calculation in step S102, L, K1、K2Can be measured by a factory test, L is measured by a full-automatic capacitance and inductance tester when the voltage transformer is delivered from a factory, K1、K2The voltage transformer voltage-current transformation ratio is measured by a transformer volt-ampere transformation ratio comprehensive transformer tester when the bus PT and the voltage transformer are delivered. According to the vector of the high-voltage capacitor voltage, the high-voltage capacitor current and the medium-voltage capacitor voltage of the voltage transformerThe amplitude, frequency and phase of the signal are obtained. Wherein, the fundamental wave phase angle of the voltage of the high-voltage capacitor of the voltage transformer is defined asThe amplitude is defined as Uc1The fundamental phase angle of the high-voltage capacitor current is defined asThe amplitude is defined as Ic1, and the fundamental phase of the medium-voltage capacitor voltage is defined asThe amplitude is defined as Uc2。
S104, calculating a capacitance dielectric loss value tan of the capacitance voltage transformer according to a formula 2xAnd a capacitance Cx。
The data processing device calculates the capacitance dielectric loss value tan of the capacitance voltage transformer according to the formula 2xAnd a capacitance CxEquation 2 specifically includes:
when the value of x is 1, obtaining the dielectric loss value tan of the high-voltage capacitor of the voltage transformerx1And high-voltage capacitance C of voltage transformer1，When the value of x is 2, obtaining the dielectric loss value tan of the medium-voltage capacitor of the voltage transformerx2And medium voltage capacitance C of voltage transformer2，Wherein,for flowing a voltage acrossThe phase angle of the fundamental component of the current of the high-voltage capacitor of the inductor,is the phase angle of the fundamental component of the current flowing through the medium-voltage capacitor of the voltage transformer,is the phase angle of the voltage fundamental component at the high-voltage capacitor end of the voltage transformer,is the phase angle, U, of the fundamental component of the voltage across the medium-voltage capacitor of a voltage transformerc1Is the voltage fundamental component amplitude, U, of the high-voltage capacitor of the voltage transformerc2The amplitude of the voltage fundamental wave component of the medium-voltage capacitor of the voltage transformer is Ic1, the amplitude of the current fundamental wave component of the high-voltage capacitor of the voltage transformer is Ic2, and the amplitude of the current fundamental wave component of the medium-voltage capacitor of the voltage transformer is Ic 2. Wherein,Ic1、Uc1、Uc2as calculated in the step S103, it is obtained,Ic2obtained by calculation in step S102.
And S105, transmitting the dielectric loss value and the capacitance of the capacitor voltage transformer to a local server through a switch.
The data processing device converts the dielectric loss value tan of the high-voltage capacitor of the capacitor voltage transformer through the switch1And a capacitance C1Medium-voltage capacitance dielectric loss value tan of capacitance voltage transformer2And a capacitance C2And uploading the monitoring information to a local server, simultaneously uploading the monitoring information to a user through a network, and further remotely monitoring the operation data of the capacitive voltage transformer through an interactive interface by the user. The monitoring information can also comprise bus PT secondary voltage Uz1Secondary voltage U of capacitor voltage mutual inductorz2Capacitor voltage transformer medium voltageCapacitance current Ic2 and primary current I of intermediate transformer of capacitor voltage transformerb。
In the embodiment, dielectric loss and capacitance of the high-voltage capacitor and the low-voltage capacitor of the voltage transformer are obtained only by monitoring the secondary voltage U of the bus PTz1Secondary voltage U of voltage mutual inductorz2A medium-voltage capacitor current Ic2 of the voltage transformer and a primary current I of an intermediate transformer of the voltage transformerbThe primary voltage and current of the capacitor voltage transformer do not need to be monitored, so that a high-voltage primary lead wire is prevented from being disassembled and assembled, the workload of field measurement is reduced, all test works can be carried out under the condition of no power outage, and the normal power supply of a power system is not influenced.
In the prior art, a high-voltage capacitor and a medium-voltage capacitor are regarded as an equivalent series capacitor for monitoring a capacitive voltage transformer, and dielectric loss and capacitance of the equivalent series capacitor are calculated. Meanwhile, due to the existence of the intermediate transformer, the currents flowing through the high-voltage capacitor and the medium-voltage capacitor are not equal, and the evaluation of the dielectric loss of the capacitor by only using one current as a reference is inaccurate. In the embodiment, dielectric loss and capacitance of the high-voltage capacitor and the low-voltage capacitor of the capacitor voltage transformer are respectively calculated, the physical significance is clear, the calculation is accurate, and the capacitor with the overlarge dielectric loss is obtained, so that the fault position of the capacitor voltage transformer is accurately judged and positioned.
Since the primary and secondary voltages of the bus PT have a phase difference, a preferred implementation manner of this embodiment is that in step S102, fourier analysis is performed on the primary and secondary voltages of the bus PT and the capacitor voltage transformer to obtain the phases of the signals, and then the phase of the fundamental component of the primary voltage of the bus PT is corrected according to formula 3 to obtain the phase angle of the fundamental component of the primary voltage of the bus PT after correctionAccording to formula 4 for capacitanceCorrecting the phase of the secondary voltage fundamental component of the voltage transformer to obtain the corrected phase angle of the secondary voltage fundamental component of the capacitor voltage transformerThe formula 3 and the formula 4 are specifically:
wherein,the phase error value for the period calibration of the bus PT can be obtained by performing an error test on the bus PT,
wherein,the phase error value for the periodic calibration of the bus PT can be obtained by carrying out error test on the bus PT;the phase error value for periodic calibration of the voltage transformer to be tested can be obtained by carrying out error test on the voltage transformer to be tested;is the phase angle of the fundamental component of the secondary voltage on bus PT,the phase angle of the fundamental component of the secondary voltage of the capacitive voltage transformer can be obtained through step S102. Corrected phase angle of fundamental component of secondary voltage of bus PTAnd the corrected phase angle of the secondary voltage fundamental component of the capacitor voltage transformerThe calculation is performed next step S103 and S104.
A preferred implementation manner of this embodiment is that the method for on-line monitoring dielectric loss and capacitance of the capacitor voltage transformer further includes step S106,
and S106, sending the meteorological data to a local server through a switch.
The weather station monitors weather data such as temperature, humidity, wind speed, rainfall and illuminance in the station in real time, and uploads the weather data to the local server through the switch, so that the server can further research dielectric loss and capacitance change rules of the capacitor voltage transformer under different weather conditions.
It should be noted that the clock synchronization device provides a clock synchronization signal for the data processing device and the current/voltage monitoring device, and ensures that the data processed by the data processing device and the current/voltage monitoring device are parameters at the same time, and the synchronization error is less than 0.1 us.
According to the technical scheme, bus PT secondary voltage, capacitor voltage transformer medium-voltage capacitor current and capacitor voltage transformer intermediate transformer primary current are obtained through the voltage/current monitoring device, obtained data are sent to the data processing device to be calculated, and a capacitor voltage transformer high-voltage capacitor dielectric loss value, a capacitor voltage transformer high-voltage capacitance, a capacitor voltage transformer medium-voltage capacitor dielectric loss value and a capacitor voltage transformer medium-voltage capacitance are obtained, so that the capacitor voltage transformer dielectric loss and capacitance automatic online monitoring is achieved, the measurement result is accurate, and accurate judgment and positioning of the fault position of the capacitor voltage transformer are facilitated. Meanwhile, the high-voltage primary lead of the capacitor voltage transformer is prevented from being disassembled and assembled, the workload of field measurement is reduced, all test works can be carried out under the condition of no power outage, and the normal power supply of a power system is not influenced. The online monitoring system adopts a typical framework of a digital substation, adopts an IEC61850-9-2LE protocol as a data format, can realize information sharing and exchange with intelligent equipment of the intelligent substation supporting the IEC61850-9-2LE protocol, and has good popularization and application prospects. Meanwhile, the weather station installed on site can monitor environmental parameters including temperature, and provides important reference for researching dielectric loss and change rule between capacitance and the environmental parameters of the capacitor voltage transformer.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The capacitance voltage transformer dielectric loss and capacitance online monitoring method is characterized by comprising the following steps:
A. monitoring signals of bus PT secondary voltage, capacitor voltage transformer secondary voltage, voltage capacitor current in a voltage transformer and primary current of a capacitor voltage transformer intermediate transformer;
B. carrying out Fourier analysis on signals of the secondary voltage of the bus PT, the secondary voltage of the capacitor voltage transformer, the medium-voltage capacitor current of the capacitor voltage transformer and the medium-voltage capacitor current to obtain the amplitude and frequency of the signalsRatio and phase, wherein the phase angle of the fundamental component of the secondary voltage on the bus line PT is defined asThe amplitude is defined as Uz1The phase angle of the fundamental component of the secondary voltage of the capacitor voltage transformer is defined asThe amplitude is defined as Uz2The phase angle of the fundamental component of the medium-voltage capacitive current of the voltage transformer is defined asThe amplitude is defined as Ic2The phase angle of the primary current fundamental component of the intermediate transformer of the capacitor voltage transformer is defined asThe amplitude is defined as Ib；
C. Calculating the vectors of the high-voltage capacitor voltage, the high-voltage capacitor current and the medium-voltage capacitor voltage of the voltage transformer according to the formula 1Obtaining the amplitude, frequency and phase of the signal, wherein the fundamental wave phase angle of the voltage of the high-voltage capacitor of the voltage transformer is defined asThe amplitude is defined as Uc1The fundamental phase angle of the high-voltage capacitor current is defined asThe amplitude is defined as Ic1, and the fundamental phase of the medium-voltage capacitor voltage is defined asThe amplitude is defined as Uc2The formula 1 specifically includes:
wherein, L is inductance value and K of compensating reactor of capacitor voltage transformer1To actual transformation ratio of bus PT, K2The actual transformation ratio of the intermediate transformer of the capacitor voltage transformer is obtained;
D. calculating the dielectric loss value tan of the voltage transformer according to the formula 2xAnd a capacitance CxEquation 2 specifically includes:
when x is 1, calculating to obtain a dielectric loss value tan of the high-voltage capacitor of the capacitor voltage transformer1And high-voltage capacitance C of capacitor voltage transformer1(ii) a When x is 2, calculating to obtain the dielectric loss value tan of the medium voltage capacitor of the capacitor voltage transformer2And medium voltage capacitance C of capacitor voltage transformer2；
E. And transmitting the dielectric loss and the capacitance of the capacitor voltage transformer to a local server through a switch.
2. The on-line monitoring method for dielectric loss and capacitance of the capacitor voltage transformer according to claim 1, wherein the step B comprises: carrying out Fourier analysis on signals of bus PT secondary voltage, capacitor voltage transformer medium-voltage capacitor current and medium-voltage capacitor current to obtain the amplitude, frequency and phase of the signals, wherein the phase angle of bus PT secondary voltage fundamental wave component is defined asThe amplitude is defined as Uz1The phase angle of the fundamental component of the secondary voltage of the capacitor voltage transformer is defined asThe amplitude is defined as Uz2The phase angle of the fundamental component of the medium-voltage capacitive current of the voltage transformer is defined asThe amplitude is defined as Ic2The phase angle of the primary current fundamental component of the intermediate transformer of the capacitor voltage transformer is defined asThe amplitude is defined as IbOf fundamental component of secondary voltage of bus PT according to equation 3The phase is corrected to obtain the phase angle of the fundamental wave component of the secondary voltage of the bus PT after correctionCorrecting the phase of the secondary voltage fundamental component of the capacitor voltage transformer according to a formula 4 to obtain the corrected phase angle of the secondary voltage fundamental component of the capacitor voltage transformerThe formula 3 and the formula 4 are specifically:
wherein,the phase error value for the period calibration of the bus PT can be obtained by performing an error test on the bus PT,the phase error value for periodic calibration of the voltage transformer to be tested can be obtained by performing error test on the voltage transformer to be tested.
3. The on-line monitoring method for dielectric loss and capacitance of the capacitor voltage transformer according to claim 1 or 2, further comprising step F,
F. and the weather station sends the weather data to the local server through the switch.
4. A system for realizing the on-line monitoring method of dielectric loss and capacitance of the capacitor voltage transformer according to any one of claims 1 to 3, comprising a voltage/current monitoring device, a data processing device, a clock synchronization device, a switch and a local server, wherein,
the voltage/current monitoring device is electrically connected with the bus PT and the capacitor voltage transformer and is used for obtaining a secondary voltage signal and a current signal of the bus PT and a secondary voltage signal and a current signal of the capacitor voltage transformer and sending the secondary voltage signal and the current signal to the data processing device;
the data processing device is connected with the voltage/current monitoring device through an optical fiber and is used for analyzing and calculating voltage and current signals sent by the voltage/current monitoring device to obtain dielectric loss and capacitance of the capacitive voltage transformer;
the clock synchronization device is connected with the voltage/current monitoring device and the data processing device through optical fibers and is used for providing a synchronization clock for the voltage/current monitoring device and the data processing device;
the local server is connected with the data processing device through the switch, is externally connected with the remote server through a network, and is used for transmitting the monitored dielectric loss and capacitance information of the capacitor voltage transformer to the remote server.
5. The on-line monitoring system for dielectric loss and capacitance of the capacitor voltage transformer of claim 4, wherein the voltage/current monitoring device comprises a voltage acquisition module, a current acquisition module, a signal processing module, an A/D conversion module, a CPU and an I/O interface module.
6. The on-line monitoring system for dielectric loss and capacitance of the capacitor voltage transformer of claim 4, wherein the voltage acquisition module adopts a 0.01-level high-precision non-inductive platinum resistor.
7. The on-line dielectric loss and capacitance monitoring system of the capacitor voltage transformer of claim 4, wherein the current collection module is a 0.02-level passive zero-flux current transformer, and the current transformer is a feed-through multi-turn current transformer.
8. The on-line dielectric loss and capacitance monitoring system for the capacitor voltage transformer according to claim 4, wherein the communication between the local server and the switch adopts IEC61850-9-2LE protocol.
9. The on-line dielectric loss and capacitance monitoring system of the capacitor voltage transformer as claimed in any one of claims 4 to 8, further comprising a weather station, wherein the weather station is electrically connected with the switch.
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