CN216526006U - Wireless phasor measurement device based on electric energy chip and constant-temperature crystal oscillator - Google Patents

Abstract

The utility model relates to a wireless phasor measurement device based on an electric energy chip and a constant-temperature crystal oscillator, which comprises a primary reference end and a secondary handheld measurement end, wherein the primary reference end is connected with the secondary handheld measurement end; the primary reference end and the secondary handheld measuring end respectively comprise an electric signal acquisition module, an electric signal processing module, a DAC (digital-to-analog converter) module, a processor, a time synchronization module, a constant-temperature crystal oscillator and a communication module; the electric signal acquisition module of the primary reference end is used for acquiring electric signals of a primary loop of the transformer substation, and the electric signal acquisition module of the secondary handheld measuring end is used for acquiring electric signals of a secondary loop of the transformer substation and respectively transmitting the electric signals to the respective electric signal processing modules; the processor counts time through a constant temperature crystal oscillator; the processor controls the DAC module to generate a reference signal; the electric signal processing module obtains the phase difference between the reference signal and the electric signal. The utility model collects the electric signals of the primary loop and the secondary loop, obtains the phase difference between the current electric signal and the reference signal according to the crystal oscillator of the equipment and the electric energy chip, and judges the wiring correctness according to the phase difference.

Description

Wireless phasor measurement device based on electric energy chip and constant-temperature crystal oscillator

Technical Field

The utility model relates to a wireless phasor measurement device based on an electric energy chip and a constant-temperature crystal oscillator, and belongs to the technical field of transformer substation line detection.

Background

In an electric power system, faults such as open circuit of wiring, error of transformation ratio, error of polarity and the like of a secondary alternating current loop may occur after new construction or operation, maintenance and overhaul, and the faults may cause electric power metering error, relay protection device misoperation and even equipment explosion, thereby generating huge economic loss or personal injury accidents. Therefore, the secondary alternating current loop needs to be detected to avoid wiring errors.

Conventional secondary ac loop tests are performed by multiple personnel using a volt-ampere phase meter in conjunction with an intercom. During working, a plurality of working personnel respectively detect the corresponding nodes of the primary loop and the secondary loop through the measuring equipment, and wiring is carried out according to the measuring result. Since the primary and secondary circuits are often far apart, a worker is required to ask and answer through a communication device. The method highly depends on engineering experience of testing personnel, and is low in efficiency and accuracy.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems, the utility model provides a wireless phasor measurement device based on an electric energy chip and a constant-temperature crystal oscillator.

The technical scheme of the utility model is as follows:

a wireless phasor measurement device based on an electric energy chip and a constant-temperature crystal oscillator comprises a primary reference end and a secondary handheld measurement end; the primary reference end and the secondary handheld measuring end respectively comprise an electric signal acquisition module, an electric signal processing module, a DAC module, a processor, a time synchronization module, a constant-temperature crystal oscillator and a communication module; the electric signal acquisition module of the primary reference end is used for acquiring electric signals of a primary loop of the transformer substation, and the electric signal acquisition module of the secondary handheld measuring end is used for acquiring electric signals of a secondary loop of the transformer substation and transmitting the electric signals to respective electric signal processing modules; the primary reference end and the secondary handheld measuring end carry out time synchronization through respective time synchronization modules and transmit time synchronization results to the processor, and the processor is used for timing through the constant-temperature crystal oscillator; the processor controls the DAC module to generate a reference signal, and the reference signal is input into the electric signal processing module; the reference signal is a three-phase sinusoidal signal; the electric signal processing module obtains the phase difference between the reference signal and the electric signal; and the primary reference end transmits the phase difference to the secondary handheld measuring end through a communication module.

Further, the electric signal processing module is an ADE7880 electric energy chip; the electric signal acquisition module comprises a three-phase voltage transformer, a three-phase current transformer, a voltage signal conditioning circuit, a current signal conditioning circuit and a bidirectional analog switch; the three-phase voltage transformer is used for acquiring voltage signals of three-phase power, and the three-phase current transformer is used for acquiring current signals of the three-phase power; the voltage signal conditioning circuit conditions the voltage signal to a specific amplitude interval and then transmits the voltage signal to the bidirectional analog switch; the current signal conditioning circuit conditions the current signal to a specific amplitude interval and then transmits the current signal to the bidirectional analog switch; the processor controls the bidirectional analog switch to input a voltage signal or a current signal into the ADE7880 electric energy chip through a three-phase voltage signal channel; and the reference signal is input into the ADE7880 electric energy chip through a three-phase current signal channel.

Further, the frequency of the reference signal is 50 Hz.

Further, the primary reference end and the secondary handheld measuring end both comprise display screens.

The utility model has the following beneficial effects:

1. the device collects the electric signals of the primary circuit and the secondary circuit of the transformer substation through the primary reference end and the secondary handheld measuring end respectively, shares data through the communication module, and judges the wiring correctness according to the two electric signals.

2. The device clocks a primary reference end and a secondary handheld terminal before use, and clocks a secondary reference end and a secondary handheld measuring end after time synchronization, the primary reference end and the secondary handheld measuring end are clocked by respective constant temperature crystal oscillators, a processor controls a DAC module to generate a reference signal according to the constant temperature crystal oscillator timing, and an electric signal processing module acquires the phase difference of an electric signal according to the reference signal.

And 3, the reference signal generated by the DAC module is 50Hz, and is equal to the three-phase frequency of the transformer substation, so that the difficulty of data processing is reduced.

Drawings

FIG. 1 is a block diagram of the present invention.

Detailed Description

The utility model is described in detail below with reference to the figures and the specific embodiments.

Referring to fig. 1, a wireless phasor measurement apparatus based on an electric energy chip and a constant temperature crystal oscillator includes a primary reference terminal and a secondary handheld measurement terminal; the primary reference end and the secondary handheld measuring end respectively comprise an electric signal acquisition module, an electric signal processing module, a DAC module, a processor, a time synchronization module, a constant-temperature crystal oscillator and a communication module; the electric signal acquisition module of the primary reference end is used for acquiring electric signals of a primary loop of the transformer substation, and the electric signal acquisition module of the secondary handheld measuring end is used for acquiring electric signals of a secondary loop of the transformer substation and transmitting the electric signals to respective electric signal processing modules; the electric signal is a voltage signal or a current signal of three-phase electricity.

The primary reference end and the secondary handheld measuring end carry out time synchronization through respective time synchronization modules and transmit time synchronization results to the processor, and the processor is used for timing through the constant-temperature crystal oscillator; the processor controls the DAC module to generate a reference signal, and the reference signal is input into the electric signal processing module; the reference signal is a three-phase sinusoidal signal; the processor generates a reference signal according to the timing of the constant-temperature crystal oscillator, and the difference between the crystal oscillator error and the reference signal frequency is very large, so that the crystal oscillator is used as the timing standard, and the accuracy is sufficient. The processor can be a single chip microcomputer, and in the embodiment, the processor is an STM32F4 single chip microcomputer. Some singlechips are provided with built-in crystal oscillator, but the built-in crystal oscillator receives external environment influence great, like temperature variation, consequently uses the precision that constant temperature crystal oscillator can improve equipment.

The electric signal processing module obtains the phase difference between the reference signal and the electric signal; and the primary reference end transmits the phase difference to the secondary handheld measuring end through a communication module. The phase difference between each phase of the three-phase power is 120 degrees, and if the phase difference measured by the primary loop and the secondary loop is the same, the wiring is correct.

In at least one embodiment, the electrical signal processing module is an ADE7880 power chip; the electric signal acquisition module comprises a three-phase voltage transformer, a three-phase current transformer, a voltage signal conditioning circuit, a current signal conditioning circuit and a bidirectional analog switch; the three-phase voltage transformer is used for acquiring voltage signals of three-phase power, and the three-phase current transformer is used for acquiring current signals of the three-phase power; the voltage signal conditioning circuit conditions the voltage signal to a specific amplitude interval and then transmits the voltage signal to the bidirectional analog switch; and the current signal conditioning circuit conditions the current signal to a specific amplitude interval and then transmits the current signal to the bidirectional analog switch. Because the three-phase power in the primary loop and the secondary loop is too high, amplitude modulation is needed, and in the embodiment, the voltage signal and the current signal are in a range of +/-0.5V in amplitude.

The processor controls the bidirectional analog switch to input a voltage signal or a current signal into the ADE7880 electric energy chip through a three-phase voltage signal channel; and the reference signal is input into the ADE7880 electric energy chip through a three-phase current signal channel.

In at least one embodiment, the frequency of the reference signal is 50 Hz. The frequency of the three-phase power of the transformer substation is 50Hz, and the calculated amount of signal processing is reduced by adopting the reference signal with the same frequency.

In at least one embodiment, the primary reference terminal and the secondary handheld measurement terminal each include a display screen. The detection result is displayed through the display screen, and the method is more visual and efficient.

Referring to fig. 1, the working principle of the present invention is as follows:

before the time synchronization device is used, the primary reference end and the secondary handheld measuring end are subjected to time synchronization, the primary reference end and the secondary handheld measuring end after the time synchronization are timed through a crystal oscillator, the same reference signal is generated, and the phase difference between the two reference signals is 0.

When the transformer substation is used, a 380V construction power supply in a primary loop of a high-voltage side is connected, the whole transformer substation runs at low voltage, and operation risks are reduced. Acquiring an electric signal of a specific node of a primary loop of the transformer substation through a primary reference end, and acquiring an electric signal of a specific node of a secondary loop of the transformer substation through a secondary handheld measuring end, wherein the electric signal is a voltage signal or a current signal; when collecting current signals, three phases of the primary loop and the secondary loop need to be grounded or connected with a high-power resistor in series to generate required current. The processor controls the bidirectional analog switch to select to detect the voltage signal or the current signal. The primary reference end transmits the acquired phase difference of the primary loop to the secondary handheld measuring end through the communication module, an operator checks the phase difference of the primary loop and the secondary loop through the secondary handheld measuring end, and if the phase difference is equal, wiring is correct.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the specification and the drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.

Claims (4)

1. A wireless phasor measurement device based on an electric energy chip and a constant-temperature crystal oscillator is characterized by comprising a primary reference end and a secondary handheld measurement end; the primary reference end and the secondary handheld measuring end respectively comprise an electric signal acquisition module, an electric signal processing module, a DAC module, a processor, a time synchronization module, a constant-temperature crystal oscillator and a communication module; the electric signal acquisition module of the primary reference end is used for acquiring electric signals of a primary loop of the transformer substation, and the electric signal acquisition module of the secondary handheld measuring end is used for acquiring electric signals of a secondary loop of the transformer substation and transmitting the electric signals to respective electric signal processing modules; the primary reference end and the secondary handheld measuring end carry out time synchronization through respective time synchronization modules and transmit time synchronization results to the processor, and the processor is used for timing through the constant-temperature crystal oscillator; the processor controls the DAC module to generate a reference signal, and the reference signal is input into the electric signal processing module; the reference signal is a three-phase sinusoidal signal; the electric signal processing module obtains the phase difference between the reference signal and the electric signal; and the primary reference end transmits the phase difference to the secondary handheld measuring end through a communication module.

2. The wireless phasor measurement device according to claim 1, wherein the electrical signal processing module is an ADE7880 electrical energy chip; the electric signal acquisition module comprises a three-phase voltage transformer, a three-phase current transformer, a voltage signal conditioning circuit, a current signal conditioning circuit and a bidirectional analog switch; the three-phase voltage transformer is used for acquiring voltage signals of three-phase power, and the three-phase current transformer is used for acquiring current signals of the three-phase power; the voltage signal conditioning circuit conditions the voltage signal to a specific amplitude interval and then transmits the voltage signal to the bidirectional analog switch; the current signal conditioning circuit conditions the current signal to a specific amplitude interval and then transmits the current signal to the bidirectional analog switch; the processor controls the bidirectional analog switch to input a voltage signal or a current signal into the ADE7880 electric energy chip through a three-phase voltage signal channel; and the reference signal is input into the ADE7880 electric energy chip through a three-phase current signal channel.

3. The wireless phasor measurement device according to claim 1, wherein the frequency of the reference signal is 50 Hz.

4. The wireless phasor measurement device according to claim 1, wherein the primary reference terminal and the secondary handheld measurement terminal each include a display screen.

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