CN208588777U - A kind of device for measuring transformer running parameter - Google Patents
A kind of device for measuring transformer running parameter Download PDFInfo
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- CN208588777U CN208588777U CN201820383470.4U CN201820383470U CN208588777U CN 208588777 U CN208588777 U CN 208588777U CN 201820383470 U CN201820383470 U CN 201820383470U CN 208588777 U CN208588777 U CN 208588777U
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Abstract
The utility model provides a kind of device for measuring transformer running parameter, and described device includes: reference voltage measuring unit, is used to acquire the secondary side voltage signal of bus-bar potential transformer；End shield voltage measurement unit is used to acquire the end shield voltage of the bushing shell for transformer；Transient overvoltage measuring unit is used to acquire transient overvoltage signal；Data transmission unit is used to carry out data transmission between data processing unit and three voltage measurement units；Data processing unit is used to that the data that three voltage measurement units acquire to be shown, analyzed and be calculated；Alarm unit is used for the utility model under the premise of accurately measuring overvoltage signal based on Transformer Bushing Tap characteristic to realize electric power netting safe running, the accuracy of dielectric loss measurement is realized by accurate measuring basis voltage signal.
Description
Technical field
The utility model relates to power measurement technical fields, and are used for measuring transformer work more particularly, to one kind
Make the device of parameter.
Background technique
The dielectric loss measurement of bushing shell for transformer usually requires the benchmark for selecting busbar voltage as phase measurement.Traditional
Processing mode is the secondary side voltage signal of bus PT to be supplied directly to detection system, and major defect is that field wiring is multiple
Miscellaneous, reference voltage signal is in the transmit process of long range vulnerable to the influence of the interference of electromagnetic field, it is possible to lead to dielectric loss measurement knot
Fruit distortion, therefore it is significant for the dielectric loss of accurate measuring transformer casing how accurately to acquire reference voltage signal.
In addition, the main reason for overvoltage is electric network fault and insulation generation defect, the over-voltage monitoring side based on bottom shielding of bushing characteristic
Method is studied more at present, and overvoltage signal acquisition methods mainly have an indirect type and two kinds of direct-type: indirect methods are by wearing
Core type current transformer measures bottom shielding of bushing tap current, and thus electric current obtains overvoltage signal indirectly, and this method does not change
Sleeve body electrical structure, securely and reliably, but since over-voltage waveform diversity makes bottom shielding of bushing tap current frequency distribution
Range is wider, and current transformer band designs are more difficult, and measurement effect is not good enough；Direct-type method passes through external voltage sensor
With capacitive apparatus divider in series to obtain voltage signal, this method principle is simple, but there is with making capacitive apparatus
The grave danger that line disconnects, therefore this method is difficult to promote, and therefore, how to be based on Transformer Bushing Tap characteristic and accurately measured electricity
Under the premise of pressure signal is to realize electric power netting safe running, by accurate measuring basis voltage signal to realize dielectric loss measurement
Accuracy becomes the utility model problem urgently to be resolved.
Utility model content
In order to solve existing for background technique how based on Transformer Bushing Tap characteristic accurately measure overvoltage signal with
Under the premise of realizing electric power netting safe running, the accuracy of dielectric loss measurement is realized by accurate measuring basis voltage signal
Technical problem, the present invention provide a kind of device for measuring transformer running parameter, and described device includes:
Reference voltage measuring unit is located at the bus-bar potential transformer secondary side of transformer, for acquiring the bus
The secondary side current signal In is simultaneously converted to the two of bus-bar potential transformer by the secondary side current signal In of voltage transformer
Secondary side voltage signal Un calculates first fundamental wave phase of the secondary side voltage signal Un relative to ac working power supply Us
Ph(n-s)；
End shield voltage measurement unit is grounded with the end shield of bushing shell for transformer and couples, for acquiring the transformer set
The end shield electric current Ix of pipe, and the end shield electric current Ix is converted to the end shield voltage Ux of bushing shell for transformer, calculate the end shield electricity
Press second fundamental wave phase Ph of the Ux relative to ac working power supply Us(x-s)；
Sampling resistor is installed on Transformer Bushing Tap ground line, for making the mistake by Transformer Bushing Tap
Voltage signal is transformed to current signal；
Transient overvoltage measuring unit, it is in parallel with sampling resistor, the current signal of sampling resistor is flowed through simultaneously for acquiring
It exports after being converted into overvoltage signal to data processing unit；
Data transmission unit, one end are connect with data processing unit, the other end and reference voltage measuring unit, end shield electricity
Pressure measuring unit is connected with transient overvoltage measuring unit, for the acquisition instructions of the data processing unit to be sent to benchmark
Voltage measurement unit, end shield voltage measurement unit or transient overvoltage measuring unit, and by first fundamental wave phase Ph(n-s)From base
Quasi- voltage measurement unit is transferred to data processing unit, by second fundamental wave phase Ph(x-s)It is transferred to from end shield voltage measurement unit
Transient overvoltage signal is transferred to data processing unit from transient overvoltage measuring unit by data processing unit；
Data processing unit is used to generate acquisition instructions to control reference voltage measuring unit, end shield voltage measurement list
Member and transient overvoltage measuring unit acquire data, the waveform for the overvoltage signal that display transient overvoltage measuring unit is exported
And according to the received first fundamental wave phase Ph of institute(n-s)With second fundamental wave phase Ph(x-s)Determine that Transformer Bushing Tap electric current is believed
Number third phase potential difference Ph of the Ix relative to busbar voltage Un, and determine that bushing shell for transformer medium damages according to the third phase potential difference Ph
Consume Tan δ.
Anti- open-circuit-protection unit, it is in parallel with sampling resistor, for preventing open circuit.
Further, the data transmission unit is local communication bus.
Further, the data processing unit is according to the received first fundamental wave phase Ph of institute(n-s)With second fundamental wave phase
Ph(x-s)Determine calculation formula of the Transformer Bushing Tap current signal Ix relative to the third phase potential difference Ph of busbar voltage Un are as follows:
Ph=Ph(x-s)-Ph(n-s)
Further, the data processing unit determines bushing shell for transformer dielectric loss according to the third phase potential difference Ph
The calculation formula of Tan δ are as follows:
Tan δ=Tan (pi/2-Ph)
Further, the data processing unit generates acquisition instructions to control reference voltage measuring unit and end shield voltage
Measuring unit synchronous acquisition.
Further, the secondary side current signal In is converted to mother by sensor by the reference voltage measuring unit
The secondary side voltage signal Un of line voltage mutual inductor simultaneously carries out fast Fourier transform to the secondary side voltage signal Un to obtain
First fundamental wave phase Ph (n-s) of the secondary side voltage signal Un relative to ac working power supply Us, the end shield voltage are surveyed
It measures unit and the end shield electric current Ix is converted to by the end shield voltage Ux of bushing shell for transformer by sensor and to the end shield voltage
Fast Fourier transform is carried out to obtain second fundamental wave phase Ph (x- of the end shield voltage Ux relative to ac working power supply Us
s)。
Further, the reference voltage measuring unit includes 3 Measurement channels, measuring transformer 3 can be nested simultaneously
The reference voltage signal of pipe, the transient overvoltage measuring unit also include 3 Measurement channels, and the 3 of energy while measuring transformer
The transient overvoltage signal of phase bottom shielding of bushing.
Further, the overvoltage signal of the transient overvoltage measuring unit acquisition includes Lightning Over-voltage signal and behaviour
Make overvoltage signal.
Further, multiple reference voltage measuring units and transient overvoltage measuring unit can be set in described device, with
The reference voltage signal and transient overvoltage signal of more transformers are measured simultaneously.
By technical solution provided by the utility model, using the high-power sampling resistor of high-precision from bushing shell for transformer
Overvoltage signal acquisition is carried out on end shield ground line, and has installed anti-open-circuit-protection unit additional, so as to acquire wider measurement frequency band
Overvoltage signal, can effectively restore the waveform of lightning surge and switching overvoltage, provide foundation for crash analysis, improve
The safety of operation of power networks, at the same by acquisition reference voltage signal with calculate after bottom shielding of bushing voltage signal relative to exchanging
The phase difference of working power, and the mode of phase bit comparison is carried out in data processing unit to determine the medium of bushing shell for transformer
Loss, reduce is influenced dielectric loss measurement result accuracy by the interference of electromagnetic field in reference voltage signal transmit process, is increased
The safety for having added acquisition reference voltage signal, improves the accuracy of dielectric loss measurement.
Detailed description of the invention
By reference to the following drawings, the illustrative embodiments of the utility model can be more fully understood by:
Fig. 1 is the structure chart of the device of the measuring transformer running parameter of specific embodiment of the present invention；
Fig. 2 is the device acquisition transient overvoltage of the measuring transformer running parameter of specific embodiment of the present invention
Schematic diagram；
Fig. 3 is that the phase measurement of the device for measuring transformer running parameter of specific embodiment of the present invention is former
Reason figure.
Specific embodiment
The illustrative embodiments of the utility model are introduced referring now to the drawings, however, the utility model can use many
Different forms is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be in order at large and complete
Open the utility model entirely, and the scope of the utility model is sufficiently conveyed to person of ordinary skill in the field.For
The term in illustrative embodiments being illustrated in the accompanying drawings not is the restriction to the utility model.In the accompanying drawings, identical
Cells/elements use identical appended drawing reference.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the structure chart of the device of the measuring transformer running parameter of specific embodiment of the present invention.Such as Fig. 1 institute
Show, the device 100 of measuring transformer running parameter described in the utility model includes:
Reference voltage measuring unit 101 is located at the bus-bar potential transformer secondary side of transformer, for acquiring the mother
The secondary side current signal In is simultaneously converted to bus-bar potential transformer by the secondary side current signal In of line voltage mutual inductor
Secondary side voltage signal Un calculates first fundamental wave phase of the secondary side voltage signal Un relative to ac working power supply Us
Ph(n-s)；
End shield voltage measurement unit 102 is grounded with the end shield of bushing shell for transformer and couples, for acquiring the transformer
The end shield electric current Ix of casing, and the end shield electric current Ix is converted to the end shield voltage Ux of bushing shell for transformer, calculate the end shield
Second fundamental wave phase Ph of the voltage Ux relative to ac working power supply Us(x-s)；
Sampling resistor 103 is installed on Transformer Bushing Tap ground line, for making by Transformer Bushing Tap
Overvoltage signal is transformed to current signal；
Transient overvoltage measuring unit 104, it is in parallel with sampling resistor, for acquiring the current signal for flowing through sampling resistor
And it exports after being converted into overvoltage signal to data processing unit；
Data transmission unit 105, one end is connect with data processing unit, the other end and reference voltage measuring unit, end
Screen voltage measurement unit is connected with transient overvoltage measuring unit, for being sent to the acquisition instructions of the data processing unit
Reference voltage measuring unit, end shield voltage measurement unit or transient overvoltage measuring unit, and by first fundamental wave phase Ph(n-s)
It is transferred to data processing unit from reference voltage measuring unit, by second fundamental wave phase Ph(x-s)It is passed from end shield voltage measurement unit
It is defeated by data processing unit and transient overvoltage signal is transferred to data processing unit from transient overvoltage measuring unit；
Data processing unit 106 is used to generate acquisition instructions to control reference voltage measuring unit, end shield voltage measurement
Unit and transient overvoltage measuring unit acquire data, the wave for the overvoltage signal that display transient overvoltage measuring unit is exported
Shape and according to the received first fundamental wave phase Ph of institute(n-s)With second fundamental wave phase Ph(x-s)Determine Transformer Bushing Tap electric current
Third phase potential difference Ph of the signal Ix relative to busbar voltage Un, and bushing shell for transformer dielectric loss is determined according to third phase potential difference Ph
Tanδ；
Anti- open-circuit-protection unit 107, in parallel with sampling resistor 103, for preventing open circuit.
Fig. 2 is the device acquisition transient overvoltage of the measuring transformer running parameter of specific embodiment of the present invention
Schematic diagram.As shown in Fig. 2, sampling resistor 103 is installed on Transformer Bushing Tap ground line, transient overvoltage measuring unit
104 and anti-open-circuit-protection unit 107 it is in parallel with sampling resistor 103 respectively, transient overvoltage measuring unit 104 acquire overvoltage
Signal is sent to data transmission unit 105.
Preferably, the data transmission unit 105 is local communication bus.
Fig. 3 is that the phase measurement of the device for measuring transformer running parameter of specific embodiment of the present invention is former
Reason figure.As shown in figure 3, the secondary voltage signal Un of bus-bar potential transformer PT is transformed to current signal In by resistance R, by pacifying
Reference voltage monitoring unit (LC1) measurement near PT secondary sample screen, the end shield current signal Ix of bushing shell for transformer is then
It is measured by end shield voltage monitoring unit (LC2), under the control of data processing unit, two location measurement units LC1's and LC2
Signal acquiring system starts simultaneously, synchronizes and is carried out at sampling and fast Fourier transform to the analog voltage signal of sensor output
Reason, obtains fundamental phase Ph of the input signal Un and Ux relative to 220Vac working power Us(n-s)And Ph(x-s).Data processing list
Member need to only read the corresponding phase measurement of LC1, LC2 by local communication bus, can calculate Transformer Bushing Tap
Phase difference Ph of the current signal Ix relative to busbar voltage Un, to obtain its dielectric loss Tan δ.Wherein, the data processing
Unit 106 is according to the received first fundamental wave phase Ph of institute(n-s)With second fundamental wave phase Ph(x-s)Determine Transformer Bushing Tap electricity
Flow calculation formula of the signal Ix relative to the third phase potential difference Ph of busbar voltage Un are as follows:
Ph=Ph(x-s)-Ph(n-s)
The data processing unit 106 determines the meter of bushing shell for transformer dielectric loss Tan δ according to the third phase potential difference Ph
Calculate formula are as follows:
Tan δ=Tan (pi/2-Ph)
Preferably, the data processing unit 106 generates acquisition instructions to control reference voltage measuring unit and end shield electricity
Press measuring unit synchronous acquisition.
Preferably, the reference voltage measuring unit 101 is converted to the secondary side current signal In by sensor
The secondary side voltage signal Un of bus-bar potential transformer simultaneously carries out fast Fourier transform to the secondary side voltage signal Un to obtain
First fundamental wave phase Ph (n-s) to the secondary side voltage signal Un relative to ac working power supply Us, the end shield voltage
The end shield electric current Ix by sensor is converted to the end shield voltage Ux of bushing shell for transformer and to end shield electricity by measuring unit
Pressure carries out fast Fourier transform to obtain second fundamental wave phase Ph (x- of the end shield voltage Ux relative to ac working power supply Us
s)。
Preferably, the reference voltage measuring unit 101 includes 3 Measurement channels, measuring transformer 3 can be nested simultaneously
The reference voltage signal of pipe, the transient overvoltage measuring unit 104 also include 3 Measurement channels, energy while measuring transformer
3 phase bottom shielding of bushing transient overvoltage signal.
Preferably, the overvoltage signal that the transient overvoltage measuring unit 104 acquires include Lightning Over-voltage signal and
Switching overvoltage signal.
Preferably, multiple reference voltage measuring units 101 and transient overvoltage measuring unit can be set in described device
104, to measure the reference voltage signal and transient overvoltage signal of more transformers simultaneously.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (6)
1. a kind of device for measuring transformer running parameter, which is characterized in that described device includes:
Reference voltage measuring unit is located at the bus-bar potential transformer secondary side of transformer, for acquiring the busbar voltage
The secondary side current signal In of mutual inductor and the secondary side that the secondary side current signal In is converted to bus-bar potential transformer
Voltage signal Un calculates first fundamental wave phase Ph of the secondary side voltage signal Un relative to ac working power supply Us(n-s)；
End shield voltage measurement unit is grounded with the end shield of bushing shell for transformer and couples, for acquiring the bushing shell for transformer
End shield electric current Ix, and the end shield electric current Ix is converted to the end shield voltage Ux of bushing shell for transformer, calculate the end shield voltage Ux
Second fundamental wave phase Ph relative to ac working power supply Us(x-s)；
Sampling resistor is installed on Transformer Bushing Tap ground line, for making the overvoltage by Transformer Bushing Tap
Signal is transformed to current signal；
Transient overvoltage measuring unit, it is in parallel with sampling resistor, for acquire flow through sampling resistor current signal and by its
It exports after being converted to overvoltage signal to data processing unit；
Data transmission unit, one end are connect with data processing unit, and the other end and reference voltage measuring unit, end shield voltage are surveyed
Amount unit is connected with transient overvoltage measuring unit, for the acquisition instructions of the data processing unit to be sent to reference voltage
Measuring unit, end shield voltage measurement unit or transient overvoltage measuring unit, and by first fundamental wave phase Ph(n-s)From benchmark electricity
Pressure measuring unit is transferred to data processing unit, by second fundamental wave phase Ph(x-s)Data are transferred to from end shield voltage measurement unit
Transient overvoltage signal is transferred to data processing unit from transient overvoltage measuring unit by processing unit；
Data processing unit, be used to generate acquisition instructions with control reference voltage measuring unit, end shield voltage measurement unit and
Transient overvoltage measuring unit acquires data, the waveform of overvoltage signal that display transient overvoltage measuring unit is exported and
According to the received first fundamental wave phase Ph of institute(n-s)With second fundamental wave phase Ph(x-s)Determine Transformer Bushing Tap current signal Ix
Bushing shell for transformer dielectric loss is determined relative to the third phase potential difference Ph of busbar voltage Un, and according to the third phase potential difference Ph
Tanδ；
Anti- open-circuit-protection unit, it is in parallel with sampling resistor, for preventing open circuit.
2. the apparatus according to claim 1, which is characterized in that the data transmission unit is local communication bus.
3. the apparatus according to claim 1, which is characterized in that the data processing unit generates acquisition instructions to control base
Quasi- voltage measurement unit and end shield voltage measurement unit synchronous acquisition.
4. the apparatus according to claim 1, which is characterized in that the reference voltage measuring unit includes 3 Measurement channels,
The reference voltage signal of 3 phase casings of energy while measuring transformer, the transient overvoltage measuring unit also include that 3 measurements are logical
Road, the transient overvoltage signal of energy while 3 phase bottom shielding of bushing of measuring transformer.
5. the apparatus according to claim 1, which is characterized in that the overvoltage letter of the transient overvoltage measuring unit acquisition
Number include Lightning Over-voltage signal and switching overvoltage signal.
6. the apparatus according to claim 1, which is characterized in that multiple reference voltage measuring units can be arranged in described device
With transient overvoltage measuring unit, to measure the reference voltage signal and transient overvoltage signal of more transformers simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820383470.4U CN208588777U (en) | 2018-03-21 | 2018-03-21 | A kind of device for measuring transformer running parameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820383470.4U CN208588777U (en) | 2018-03-21 | 2018-03-21 | A kind of device for measuring transformer running parameter |
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| Publication Number | Publication Date |
|---|---|
| CN208588777U true CN208588777U (en) | 2019-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820383470.4U Active CN208588777U (en) | 2018-03-21 | 2018-03-21 | A kind of device for measuring transformer running parameter |
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