CN210071891U - Transformer substation current loop simulation calibrator - Google Patents
Transformer substation current loop simulation calibrator Download PDFInfo
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- CN210071891U CN210071891U CN201920503590.8U CN201920503590U CN210071891U CN 210071891 U CN210071891 U CN 210071891U CN 201920503590 U CN201920503590 U CN 201920503590U CN 210071891 U CN210071891 U CN 210071891U
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Abstract
The utility model discloses a transformer substation's current loop emulation check gauge, including transformer, phase comparator, low pass filter, voltage controlled oscillator, treater and three power amplifier, the elementary and the commercial power connection of transformer, the secondary of transformer is connected with the first input of phase comparator, the output and the low pass filter of phase comparator are connected, low pass filter's output and voltage controlled oscillator's input are connected, voltage controlled oscillator's output is connected with the second input of phase comparator and the input of treater respectively, the output of treater is connected with three power amplifier's input respectively. The utility model discloses can export three phase current as test current, can follow the frequency and the phase place of electric wire netting simultaneously, the utility model discloses can convenience of customers test, promote efficiency of software testing. The utility model discloses can wide application in electric power test instrument field.
Description
Technical Field
The utility model belongs to the technical field of the electric power test instrument and specifically relates to a transformer substation's current loop emulation check gauge.
Background
With the popularization of typical design of transformer substations, electrical equipment with the voltage level of 110KV and above adopts a multi-interval GIS assembly mode at present, and relay protection adopts a centralized control mode. In order to enable relay protection, data monitoring, and the like to stably operate, calibration of a current secondary circuit becomes a critical operation. The conventional current loop verification method has shown many disadvantages, and the technology is yet to be innovated and improved.
At present, in domestic current loop check tests, a large current generator is mainly used for conducting through-flow on a primary side of a current transformer, then a clamp meter is used for monitoring current on a secondary side of the current transformer or a protection measurement and control device is used for checking the amplitude of sampled current so as to determine the transformation ratio of the current transformer and check the correctness of a current secondary loop.
Because the power supply system mostly adopts a three-phase alternating current transmission mode, the traditional test method can only realize through current of a single current transformer at each time, and the phase relation of three-phase current of a power secondary circuit cannot be verified.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims to provide a: the high-efficiency transformer substation current loop simulation calibrator is provided.
The utility model adopts the technical proposal that:
the utility model provides a transformer substation's current loop emulation check gauge, includes transformer, phase comparator, low pass filter, voltage controlled oscillator, treater and three power amplifier, the elementary and the commercial power connection of transformer, the secondary of transformer is connected with the first input of phase comparator, the output and the low pass filter of phase comparator are connected, low pass filter's output and voltage controlled oscillator's input are connected, voltage controlled oscillator's output is connected with the second input of phase comparator and the input of treater respectively, the output of treater is connected with three power amplifier's input respectively.
And further, the system also comprises a display screen, and the input end of the display screen is connected with the output end of the processor.
Further, the system also comprises an input panel, and the output end of the input panel is connected with the input end of the processor.
Further, the processor comprises a DA unit, and the processor is connected with the input end of the power amplifier through the DA unit.
Further, the power amplifier includes a plurality of power transistors connected in parallel.
The utility model has the advantages that: the utility model discloses can export three phase current as test current to add the following circuit who comprises phase comparator, low pass filter and voltage controlled oscillator, it can follow the frequency and the phase place of electric wire netting, make the user when the test, can regard as reference voltage with the commercial power, greatly reduced the trouble of user's test, promoted efficiency of software testing.
Drawings
Fig. 1 is a block diagram of a transformer substation current loop simulation calibrator according to an embodiment of the present invention;
fig. 2 is the utility model relates to a transformer substation's current loop emulation check gauge's schematic structure diagram of a specific embodiment.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments.
Referring to fig. 1, the present embodiment discloses a transformer substation current loop simulation calibrator, including transformer, phase comparator, low pass filter, voltage controlled oscillator, treater and three power amplifier, the elementary and the commercial power of transformer are connected, the secondary of transformer is connected with the first input of phase comparator, the output of phase comparator is connected with low pass filter, low pass filter's output is connected with voltage controlled oscillator's input, voltage controlled oscillator's output is connected with the second input of phase comparator and the input of treater respectively, the output of treater is connected with three power amplifier's input respectively.
In which the primary of the transformer is connected to the live and neutral lines of the mains, and after the voltage has passed to the secondary, the voltage is reduced, which is then fed to a phase comparator as a reference voltage.
The phase comparator is used for comparing the output phase of the voltage-controlled oscillator with the phase of the reference voltage. The phase comparator returns the result of its comparison in the form of a voltage value to the voltage-controlled oscillator via a low-pass filter, thus forming a feedback loop. The output phase and frequency of the voltage-controlled oscillator are consistent with the reference voltage, so that the purpose of tracking the voltage of the power grid is achieved. The voltage-controlled oscillator is an oscillating circuit with output frequency corresponding to input control voltage, the frequency is an oscillator of a function of input signal voltage, and the working state of the oscillator or the element parameters of an oscillating circuit are controlled by the input control voltage to form the voltage-controlled oscillator.
And the processor is used for processing the signals output by the voltage-controlled oscillator and then outputting three sine wave signals with the phase difference of 120 degrees so as to drive the three power amplifiers to generate three-phase currents.
And the power amplifier is used for amplifying the amplitude of the signal output by the processor. The power supply of the power amplifier can be obtained by rectifying, filtering and regulating the voltage of a power grid. The power amplifier can be composed of a plurality of power tubes connected in parallel, and the grid electrodes or the base electrodes of the power tubes are controlled by the output end of the processor.
Referring to fig. 2, as a preferred embodiment, a display screen 102 is further included, an input of which is connected to the output of the processor. The display is connected with the processor through a serial port and used for displaying instrument parameters and an operation interface.
Referring to fig. 2, as a preferred embodiment, an input panel 103 is further included, the output of which is connected to the input of the processor. The input panel includes a plurality of operation buttons including a power key and the like. In addition, four output holes 101 are included on the front face of the instrument, including three live wire and neutral wire interfaces for three-phase current.
As a preferred embodiment, the processor comprises a DA unit, and the processor is connected with the input end of the power amplifier through the DA unit. The DA unit processes the digital signal of the processor into an analog signal and outputs the analog signal.
As a preferred embodiment, the power amplifier comprises a plurality of power transistors connected in parallel. The present embodiment can boost the output power.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (5)
1. The utility model provides a transformer substation's current loop emulation check gauge which characterized in that: including transformer, phase comparator, low pass filter, voltage controlled oscillator, treater and three power amplifier, the elementary and the commercial power connection of transformer, the secondary of transformer is connected with the first input of phase comparator, the output and the low pass filter of phase comparator are connected, low pass filter's output is connected with voltage controlled oscillator's input, voltage controlled oscillator's output is connected with the second input of phase comparator and the input of treater respectively, the output of treater is connected with three power amplifier's input respectively.
2. The transformer substation current loop simulation calibrator according to claim 1, wherein: the intelligent control system further comprises a display screen, and the input end of the display screen is connected with the output end of the processor.
3. The transformer substation current loop simulation calibrator according to claim 1, wherein: the system also comprises an input panel, wherein the output end of the input panel is connected with the input end of the processor.
4. The transformer substation current loop simulation calibrator according to claim 1, wherein: the processor comprises a DA unit, and is connected with the input end of the power amplifier through the DA unit.
5. The transformer substation current loop simulation calibrator according to claim 1, wherein: the power amplifier includes a plurality of power transistors connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920503590.8U CN210071891U (en) | 2019-04-12 | 2019-04-12 | Transformer substation current loop simulation calibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920503590.8U CN210071891U (en) | 2019-04-12 | 2019-04-12 | Transformer substation current loop simulation calibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210071891U true CN210071891U (en) | 2020-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920503590.8U Active CN210071891U (en) | 2019-04-12 | 2019-04-12 | Transformer substation current loop simulation calibrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210071891U (en) |
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2019
- 2019-04-12 CN CN201920503590.8U patent/CN210071891U/en active Active
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