CN111336913B - Transformer winding deformation live monitoring device - Google Patents
Transformer winding deformation live monitoring device Download PDFInfo
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- CN111336913B CN111336913B CN202010195493.4A CN202010195493A CN111336913B CN 111336913 B CN111336913 B CN 111336913B CN 202010195493 A CN202010195493 A CN 202010195493A CN 111336913 B CN111336913 B CN 111336913B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
Abstract
The invention relates to a transformer winding deformation live monitoring device which comprises a signal acquisition unit, a signal conditioning unit, a signal acquisition unit, a communication unit and a cloud server. The signal acquisition unit is used for acquiring input side voltage/current and output side voltage/current of the transformer; the signal conditioning unit is used for conditioning the acquired signals; the signal acquisition unit is used for synchronously acquiring the amplitude and the phase of the voltage/current at the input side of the transformer and the amplitude and the phase of the voltage/current at the output side; the communication unit is used for transmitting the collected signals; the cloud server is used for calculating to obtain the live-line operation equivalent impedance of the transformer based on the amplitude and the phase of the input side voltage/current and the amplitude and the phase of the output side voltage/current of the transformer, and obtaining the winding deformation condition of the transformer by comparing the live-line operation equivalent impedance of the transformer. The invention can carry out charged monitoring on the deformation state of the transformer winding, has small monitoring error and can ensure the safe operation of the transformer.
Description
Technical Field
The invention belongs to the technical field of power measurement, and particularly relates to a transformer winding deformation live monitoring device.
Background
The transformer is one of the key devices of the power transmission and transformation system, and the operation state of the transformer directly influences the reliability and safety of the power system. The winding is the core component of the transformer, and the state of the winding is directly related to the whole operation condition of the transformer. When the winding is physically displaced due to instantaneous electromotive force and heat, the winding is deformed when the physical dimension and lamination thereof are physically displaced. The deformation of the winding can cause the larger change of the electric field and the magnetic field of the transformer compared with the normal design, and can cause the increase of the impedance and the loss of the transformer, thereby causing the local overheating of the iron core of the transformer, the aging of an insulating layer, the oil quality change of the transformer, the standard exceeding of the color spectrum, and even causing the burning of the transformer.
At present, the deformation of a transformer winding is mainly measured by adopting a frequency response analysis method, and the main reference standard is as follows: a frequency response analysis method for the deformation of the windings of the DL/T911-2004 power transformer. The method mainly comprises the steps of detecting the amplitude-frequency response characteristics of each winding of the transformer, comparing the detection results longitudinally or transversely, and judging the winding deformation of the transformer possibly occurring according to the change degree of the amplitude-frequency response characteristics. The main principle is that the winding of the transformer can be regarded as a passive double-port network formed by distribution parameters such as linear resistance, inductance, capacitance and the like under the action of high-frequency voltage. If the winding is deformed, parameters such as distributed inductance and capacitance inside the winding are necessarily changed, so that the frequency response characteristic of the network is changed. The method is mainly used for characterizing the deformation condition of the winding of the transformer by detecting the change of the frequency response characteristic of the winding.
The main problems of the existing transformer winding deformation tester are as follows:
1. when the transformer winding deformation test of a frequency response analysis method is carried out, the transformer must exit from an operation state, namely an uncharged state, a voltage model with continuous frequency change is sent out through a test device to test the frequency response of the winding, the test method cannot be used for testing the charged transformer, most tests are not allowed to be powered off, and therefore the test cannot be finished;
2. the voltage signal applied to the transformer winding by the frequency response analysis method is very weak, generally in the range of several volts to dozens of volts, the excitation of the voltage to the transformer (especially a large-capacity transformer) is very weak, and because the response signal is very weak and is often expressed by dB (decibel), the signal-to-noise ratio is greatly reduced, and the measurement error is very large.
Disclosure of Invention
The invention aims to provide a transformer winding deformation electrification monitoring device which is small in error and can be used for testing the deformation condition of a transformer winding in an electrification manner.
In order to achieve the purpose, the invention adopts the technical scheme that:
a transformer winding deformation live monitoring device is used for carrying out live monitoring on the winding deformation condition of a transformer, and comprises:
the signal acquisition unit is connected with the transformer and is used for acquiring input side voltage, input side current, output side voltage and output side current of the transformer;
the signal acquisition unit is in communication connection with the signal acquisition unit and is used for synchronously acquiring the amplitude and the phase of the input side voltage, the amplitude and the phase of the input side current, the amplitude and the phase of the output side voltage and the amplitude and the phase of the output side current of the transformer by the input side voltage, the input side current, the output side voltage and the output side current of the transformer;
the cloud server is in communication connection with the signal acquisition unit and is used for calculating to obtain the live-line operation equivalent impedance of the transformer based on the amplitude and the phase of the input-side voltage, the amplitude and the phase of the input-side current, the amplitude and the phase of the output-side voltage and the amplitude and the phase of the output-side current of the transformer and comparing the live-line operation equivalent impedance of the transformer to obtain the winding deformation condition of the transformer.
Preferably, the transformer winding deformation electrification monitoring device further comprises a signal conditioning unit, wherein the signal conditioning unit is connected between the signal acquisition unit and the signal acquisition unit, and is used for conditioning the input side voltage, the input side current, the output side voltage and the output side current of the transformer acquired by the signal acquisition unit and then sending the conditioned voltage, the conditioned current and the conditioned current to the signal acquisition unit.
Preferably, the transformer winding deformation electrification monitoring device further comprises a communication unit, wherein the communication unit is connected between the signal acquisition unit and the cloud server and used for sending the amplitude and the phase of the input-side voltage, the amplitude and the phase of the input-side current, the amplitude and the phase of the output-side voltage and the amplitude and the phase of the output-side current of the transformer, which are acquired by the signal acquisition unit, to the cloud server.
Preferably, the signal acquisition unit includes:
the transformer input side voltage/current transformer is used for acquiring input side voltage and input side current of the transformer;
the transformer output side voltage/current transformer is used for acquiring the output side voltage and the output side current of the transformer.
Preferably, the signal acquisition unit includes:
the first signal acquisition card is used for acquiring the amplitude and the phase of the input side voltage of the transformer and the amplitude and the phase of the input side current of the transformer by the input side voltage and the input side current of the transformer;
the second signal acquisition card is used for acquiring the amplitude and the phase of the output side voltage of the transformer and the amplitude and the phase of the output side current of the transformer by the output side voltage and the output side current of the transformer;
the first time service module is connected with the first signal acquisition card and is used for carrying out clock synchronization on the first signal acquisition card;
and the second time service module is connected with the second signal acquisition card and is used for carrying out clock synchronization on the second signal acquisition card.
Preferably, the first time service module and the second time service module are both a GPS time service module or a beidou time service module.
Preferably, the signal conditioning unit includes:
the input side voltage/current signal conditioning module is used for conditioning the input side voltage and the input side current of the transformer acquired by the signal acquisition unit and then sending the conditioned input side voltage and input side current to the signal acquisition unit;
and the output side voltage/current signal conditioning module is used for conditioning the output side voltage and the output side current of the transformer acquired by the signal acquisition unit and then sending the conditioned output side voltage and output side current to the signal acquisition unit.
Preferably, the communication unit includes:
the first communication module is used for sending the amplitude and the phase of the input side voltage of the transformer and the amplitude and the phase of the input side current collected by the signal collection unit to the cloud server;
and the second communication module is used for sending the amplitude and the phase of the voltage at the output side of the transformer and the amplitude and the phase of the current at the output side, which are acquired by the signal acquisition unit, into the cloud server.
Preferably, the method for calculating the equivalent impedance of the transformer in the live operation by the cloud server comprises the following steps: calculating the total equivalent impedance of the passive linear dual-port network equivalent to the transformer and the passive linear single-port network equivalent to the load of the transformer according to the amplitude and the phase of the input-side voltage of the transformer and the amplitude and the phase of the input-side current, calculating the load equivalent impedance of the passive linear single-port network equivalent to the load of the transformer according to the amplitude and the phase of the output-side voltage of the transformer and the amplitude and the phase of the output-side current of the transformer, and further obtaining the equivalent impedance of the live operation of the transformer through the total equivalent impedance and the load equivalent impedance.
Preferably, the cloud server obtains the winding deformation condition of the transformer through longitudinal or transverse comparison.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention can carry out charged monitoring on the deformation state of the transformer winding, has small monitoring error and can ensure the safe operation of the transformer.
Drawings
Fig. 1 is a schematic diagram of a transformer winding deformation electrification monitoring device of the invention.
Fig. 2 is an equivalent model block diagram of a transformer and a load.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: as shown in fig. 1, a transformer winding deformation live monitoring device for live monitoring of winding deformation of a transformer includes a signal acquisition unit, a cloud server, and may further include a signal conditioning unit and a communication unit.
The signal acquisition unit is connected with the transformer and is used for acquiring input side voltage, input side current, output side voltage and output side current of the transformer. The signal acquisition unit comprises a transformer input side voltage/current transformer and a transformer output side voltage/current transformer. The transformer input side voltage/current transformer is used for acquiring input side voltage and input side current of the transformer; the transformer output side voltage/current transformer is used for acquiring the output side voltage and the output side current of the transformer.
The signal acquisition unit is in communication connection with the signal acquisition unit and is used for synchronously acquiring the amplitude and the phase of the input-side voltage, the amplitude and the phase of the input-side current, the amplitude and the phase of the output-side voltage and the amplitude and the phase of the output-side current of the transformer from the input-side voltage, the input-side current, the output-side voltage and the output-side current of the transformer. The signal acquisition unit comprises a first signal acquisition card, a second signal acquisition card, a first time service module and a second time service module. The first signal acquisition card is correspondingly connected with an input side voltage/current transformer in the signal acquisition unit and used for acquiring the amplitude and the phase of the input side voltage and the amplitude and the phase of the input side current of the transformer by the input side voltage and the input side current of the transformer. The second signal acquisition card is correspondingly connected with an output side voltage/current transformer in the signal acquisition unit and used for acquiring the amplitude and the phase of the output side voltage and the amplitude and the phase of the output side current of the transformer by the output side voltage and the output side current of the transformer. The first time service module is connected with the first signal acquisition card and used for carrying out clock synchronization on the first signal acquisition card. The second time service module is connected with the second signal acquisition card and used for carrying out clock synchronization on the second signal acquisition card. The first time service module and the second time service module are both a GPS time service module or a Beidou time service module. In this embodiment, the first time service module is a first GPS time service module connected to the first signal acquisition card, and the second time service module is a second GPS time service module connected to the second signal acquisition card. Through the application of the first time service module and the second time service module, synchronous sampling driving can be performed, the amplitude and the phase of voltage/current are guaranteed to be measured values at the same moment, and then strict synchronism of subsequent impedance calculation is guaranteed.
The signal conditioning unit is connected between the signal acquisition unit and is used for conditioning the input side voltage, the input side current, the output side voltage and the output side current of the transformer acquired by the signal acquisition unit and then sending the conditioned signals to the signal acquisition unit. The signal conditioning unit comprises an input side voltage/current signal conditioning module and an output side voltage/current signal conditioning module. And the input side voltage/current signal conditioning module is used for conditioning the input side voltage and the input side current of the transformer acquired by the signal acquisition unit and then sending the conditioned input side voltage and input side current to the signal acquisition unit. And the output side voltage/current signal conditioning module is used for conditioning the output side voltage and the output side current of the transformer acquired by the signal acquisition unit and then sending the conditioned output side voltage and output side current to the signal acquisition unit. A first signal acquisition card in the signal acquisition unit is connected with a voltage/current transformer on the input side of a transformer of the signal acquisition unit through a voltage/current signal conditioning module on the input side, and a second signal acquisition card in the signal acquisition unit is connected with a voltage/current transformer on the output side of the transformer of the signal acquisition unit through a voltage/current signal conditioning module on the output side.
The cloud server is in communication connection with the signal acquisition unit. The communication unit is connected between the signal acquisition unit and the cloud server and used for sending the amplitude and the phase of the input side voltage, the amplitude and the phase of the input side current, the amplitude and the phase of the output side voltage and the amplitude and the phase of the output side current of the transformer, which are acquired by the signal acquisition unit, into the cloud server. The communication unit includes a first communication module and a second communication module. The first communication module is used for transmitting the amplitude and the phase of the input side voltage of the transformer and the amplitude and the phase of the input side current acquired by the signal acquisition unit to the cloud server; the second communication module is used for sending the amplitude and the phase of the voltage at the output side of the transformer and the amplitude and the phase of the current at the output side, which are acquired by the signal acquisition unit, into the cloud server. The first communication module and the second communication module both adopt 4G communication modules.
The cloud server is used for calculating to obtain the live-line operation equivalent impedance of the transformer based on the amplitude and the phase of the input-side voltage of the transformer, the amplitude and the phase of the input-side current of the transformer, the amplitude and the phase of the output-side voltage and the amplitude and the phase of the output-side current of the transformer, obtaining the winding deformation condition of the transformer by comparing the live-line operation equivalent impedance of the transformer, and recording relevant data to establish a corresponding database.
As shown in fig. 2, the transformer may be equivalent to a passive linear dual-port network formed by distribution parameters such as linear resistance, inductance, and capacitance, and its impedance may be equivalent to:
Zt = Rt∠θ
the load of the live transformer under operation can be equivalent to a passive linear single-port network formed by distribution parameters such as linear resistance, inductance, capacitance and the like, and the impedance of the live transformer can be equivalent to:
Zr = Rr∠θ
based on this, the cloud server calculates the live-line operation equivalent impedance of the transformer by adopting an impedance method, and the specific method for calculating the live-line operation equivalent impedance of the transformer by the cloud server is as follows: the method comprises the steps of calculating the total equivalent impedance of a passive linear dual-port network equivalent to a transformer and a passive linear single-port network equivalent to a load of the transformer according to the amplitude and the phase of voltage on the input side of the transformer and the amplitude and the phase of current on the input side of the transformer, calculating the load equivalent impedance of the passive linear single-port network equivalent to the load of the transformer according to the amplitude and the phase of voltage on the output side of the transformer and the amplitude and the phase of current on the output side of the transformer, and further obtaining the equivalent impedance of live operation of the transformer through the total equivalent impedance and the load equivalent impedance.
And after calculating the equivalent impedance of the live operation of the transformer, the cloud server obtains the winding deformation condition of the transformer through longitudinal or transverse comparison.
The cloud server can select 1/5/10 minutes or custom time to save the data once when saving the data.
According to the scheme, the deformation state of the transformer winding can be monitored in a charged mode, the transformer can be used for measuring the deformation of the winding without power failure, monitoring data can be transmitted to the background cloud server in a wireless communication mode, and the current running state of the transformer can be analyzed through background software, so that the safe running of the transformer is ensured. The method is characterized in that the deformation of the transformer winding is measured under the condition of live operation, the operating voltage and current are rated operating conditions, voltage/current signals for calculation are high-energy signals, and the signal-to-noise ratio is far higher than that of a traditional frequency response method analysis and test method.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. The utility model provides a transformer winding warp electrified monitoring devices for carry out electrified monitoring to the winding deformation condition of transformer, its characterized in that: the transformer winding deformation live monitoring device comprises:
the signal acquisition unit is connected with the transformer and is used for acquiring input side voltage, input side current, output side voltage and output side current of the transformer;
the signal acquisition unit is in communication connection with the signal acquisition unit and is used for synchronously acquiring the amplitude and the phase of the input side voltage, the amplitude and the phase of the input side current, the amplitude and the phase of the output side voltage and the amplitude and the phase of the output side current of the transformer by the input side voltage, the input side current, the output side voltage and the output side current of the transformer;
the cloud server is in communication connection with the signal acquisition unit and is used for calculating to obtain the live-line operation equivalent impedance of the transformer based on the amplitude and the phase of the input-side voltage, the amplitude and the phase of the input-side current, the amplitude and the phase of the output-side voltage and the amplitude and the phase of the output-side current of the transformer and comparing the live-line operation equivalent impedance of the transformer to obtain the winding deformation condition of the transformer;
the method for calculating the equivalent impedance of the transformer in the live operation by the cloud server comprises the following steps: calculating the total equivalent impedance of the passive linear dual-port network equivalent to the transformer and the passive linear single-port network equivalent to the load of the transformer according to the amplitude and the phase of the input-side voltage of the transformer and the amplitude and the phase of the input-side current, calculating the load equivalent impedance of the passive linear single-port network equivalent to the load of the transformer according to the amplitude and the phase of the output-side voltage of the transformer and the amplitude and the phase of the output-side current of the transformer, and further obtaining the equivalent impedance of the live operation of the transformer through the total equivalent impedance and the load equivalent impedance.
2. The transformer winding deformation electrification monitoring device according to claim 1, wherein: the transformer winding deformation electrification monitoring device further comprises a signal conditioning unit, wherein the signal conditioning unit is connected between the signal acquisition unit and used for conditioning the input side voltage, the input side current, the output side voltage and the output side current of the transformer acquired by the signal acquisition unit and then sending the conditioned input side voltage, the input side current, the output side voltage and the output side current into the signal acquisition unit.
3. The transformer winding deformation electrification monitoring device according to claim 1, wherein: the transformer winding deformation electrification monitoring device further comprises a communication unit, wherein the communication unit is connected between the signal acquisition unit and the cloud server and used for sending the amplitude and the phase of the input side voltage, the amplitude and the phase of the input side current, the amplitude and the phase of the output side voltage and the amplitude and the phase of the output side current of the transformer, which are acquired by the signal acquisition unit, to the cloud server.
4. The transformer winding deformation electrification monitoring device according to claim 1, wherein: the signal acquisition unit includes:
the transformer input side voltage/current transformer is used for acquiring input side voltage and input side current of the transformer;
the transformer output side voltage/current transformer is used for acquiring the output side voltage and the output side current of the transformer.
5. The transformer winding deformation electrification monitoring device according to claim 1, wherein: the signal acquisition unit includes:
the first signal acquisition card is used for acquiring the amplitude and the phase of the input side voltage of the transformer and the amplitude and the phase of the input side current of the transformer by the input side voltage and the input side current of the transformer;
the second signal acquisition card is used for acquiring the amplitude and the phase of the output side voltage of the transformer and the amplitude and the phase of the output side current of the transformer by the output side voltage and the output side current of the transformer;
the first time service module is connected with the first signal acquisition card and is used for carrying out clock synchronization on the first signal acquisition card;
and the second time service module is connected with the second signal acquisition card and is used for carrying out clock synchronization on the second signal acquisition card.
6. The transformer winding deformation electrification monitoring device according to claim 5, wherein: the first time service module and the second time service module are both GPS time service modules or Beidou time service modules.
7. The transformer winding deformation electrification monitoring device according to claim 2, wherein: the signal conditioning unit includes:
the input side voltage/current signal conditioning module is used for conditioning the input side voltage and the input side current of the transformer acquired by the signal acquisition unit and then sending the conditioned input side voltage and input side current to the signal acquisition unit;
and the output side voltage/current signal conditioning module is used for conditioning the output side voltage and the output side current of the transformer acquired by the signal acquisition unit and then sending the conditioned output side voltage and output side current to the signal acquisition unit.
8. The transformer winding deformation electrification monitoring device according to claim 3, wherein: the communication unit includes:
the first communication module is used for sending the amplitude and the phase of the input side voltage of the transformer and the amplitude and the phase of the input side current collected by the signal collection unit to the cloud server;
and the second communication module is used for sending the amplitude and the phase of the voltage at the output side of the transformer and the amplitude and the phase of the current at the output side, which are acquired by the signal acquisition unit, into the cloud server.
9. The transformer winding deformation electrification monitoring device according to claim 1, wherein: and the cloud server obtains the winding deformation condition of the transformer through longitudinal or transverse comparison.
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