TWI454713B - Wireless measurement device, detection module - Google Patents

Description

Wireless measuring device, detecting module

The invention relates to a measuring device, in particular to a measuring device for wirelessly measuring the phase and voltage of a three-phase power signal.

Referring to Figure 1, there is a power line group for transmitting three-phase power signals. The power line group includes a first to a third power line L1, L2, L3, and the phases of the three power signals respectively transmitted by the first to third power lines L1, L2, and L3 are θ degrees, θ + 120 degrees, respectively. And θ + 240 degrees.

If the Taipower wants to connect the first to third transmission ports of a device (not shown) to the first to third power lines L1, L2, and L3, it is necessary to confirm the connected transmission port and the power line L1. The phases of the power signals transmitted by both L2 and L3 are the same, but the power lines L1, L2, and L3 are underground, so that the phase of each power line L1, L2, and L3 cannot be confirmed visually. The power lines L1, L2, and L3 are high-voltage power lines, which are easy to cause danger by measuring the difference by direct contact.

Based on the above, the following problems will arise:

1. If the contact measurement of all three buried power lines L1, L2, and L3 is performed to confirm the phase, it will cause inconvenience, time and labor, and danger.

2. If the device is connected to the power lines L1, L2, and L3 whose phases are inconsistent, there is a danger of short-circuiting during parallel supply operation.

Accordingly, it is a first object of the present invention to provide a wireless measuring device that solves the above problems.

Therefore, the wireless measuring device of the present invention comprises a satellite module, a wireless sensing module and a detecting module. The satellite module is configured to receive a satellite signal with time information and output a pulse signal having the time information.

The wireless sensing module is configured to sequentially sense a first to third power signals transmitted by the first to third power lines to generate a first to third changes that follow the waveforms of the first to third power signals. Inductive signal.

The detection module includes: a zero-crossing detection circuit electrically connected to the wireless sensing module for receiving the first to third sensing signals output by the wireless sensing module, and utilizing the received first to The third sensing signal sequentially outputs a first to third zero-crossing signal, and the voltages of the first to third zero-crossing signals are switched between a first level and a second level; and a time difference operation The unit is electrically connected to the satellite module to receive the pulse signal, and presets a reference time according to the time information, and electrically connects the zero-crossing detection circuit to receive the first to third zero-crossing signals, and Detecting, at the time when the voltage of the first to third zero-crossing signals after the reference time is switched from the first second level to the first level, as the first to third time, respectively, and The first to third time are respectively subtracted from the reference time to obtain first to third time differences, wherein the first to third time differences are respectively related to the first to third power signals Three phases.

Preferably, the detection module further includes: a phase operation unit pre-stores frequency information of each of the first to third power signals, and electrically connects the time difference operation unit to receive the first to third time differences, and The first to third time differences are respectively calculated with the frequency information of the first to third power signals to obtain first to third phases of the first to third power signals.

A second object of the invention is to provide a wireless measuring device that can solve the above problems and further indicate the amplitude of the power signals.

Therefore, the wireless measuring device of the present invention comprises a satellite module, a wireless sensing module and a detecting module.

The satellite module is configured to receive a satellite signal with time information and output a pulse signal having the time information.

The wireless sensing module is configured to sequentially sense a first to third power signals transmitted by the first to third power lines to generate a first to third changes that follow the waveforms of the first to third power signals. Inductive signal.

The detection module includes: a zero-crossing detection circuit electrically connected to the wireless sensing module for receiving the first to third sensing signals output by the wireless sensing module, and utilizing the received first to The third sensing signal sequentially outputs a first to third zero-crossing signal, and the voltages of the first to third zero-crossing signals are switched between a first level and a second level; a time difference operation unit And electrically connecting the satellite module to receive the pulse signal, and preset a reference time according to the time information, and electrically connecting the zero-crossing detection circuit to receive the first to third zero-crossing signals, and detecting Measuring the voltage of the first to third zero crossover signals after the reference time from The first time when the second level is switched to the first level is taken as the first to third time, respectively, and the first to third time are respectively subtracted from the reference time to obtain the first to the first a time difference, wherein the first to third time differences are respectively related to the first to third phases of the first to third power signals; and a voltage detecting circuit connected to the voltage follower to receive the first Up to the third sensing signal, and sequentially generating a first to third digital code that changes in proportion to the amplitude change of the first to third sensing signals, respectively.

A third object of the present invention is to provide a wireless measuring device that can solve the above problems and is more usable in a sheltered environment.

Therefore, the wireless measurement device of the present invention comprises a satellite module, a synchronization module, a wireless sensing module and a detection module.

The satellite module is configured to receive a satellite signal with time information and output a pulse signal having the time information.

The synchronization module is electrically connected to the satellite module to receive the pulse signal, and one of the received pulse signals is used as an initialization signal, and starts to oscillate when receiving the initialization signal to generate a preset frequency. A synchronization signal substantially the same as a frequency of the pulse signal, and comparing the synchronization signal and the pulse signal to obtain a compensation time difference.

The wireless sensing module is configured to sequentially sense a first to third power signals transmitted by the first to third power lines to generate a first to third changes that follow the waveforms of the first to third power signals. Inductive signal.

The detection module includes: a zero-crossing detection circuit electrically connected to the wireless sensing module for receiving the first to third sensing signals output by the wireless sensing module, and outputting the first to third sensing signals sequentially a first to third zero-crossing signal, wherein the voltages of the first to third zero-crossing signals are switched between a first level and a second level; and a time difference computing unit electrically connecting the satellite module Receiving the pulse signal, and preset a reference time according to the time information, and electrically connecting the zero-crossing detection circuit to receive the first to third zero-crossing signals, and detecting after the reference time The time points at which the voltages of the first to third zero-crossing signals are switched from the first one of the second levels to the first level are respectively taken as the first to third times, and the first to third times are respectively The reference time is subtracted to obtain a first to a third time difference, wherein the first to third time differences are respectively related to the first to third phases of the first to third power signals. Preferably, the detecting module further includes a voltage detecting circuit connected to the voltage follower to receive the first to third sensing signals, and sequentially generating a first to third proportional follower A digital code that changes in amplitude of the first to third inductive signals.

The fourth object of the invention is to provide a detection module.

The detection module includes: a zero-crossing detection circuit electrically connected to the wireless sensing module for receiving the first to third sensing signals output by the wireless sensing module, and using the received The first to third inductive signals sequentially output a first to third zero crossover signal, and the voltages of the first to third zero crossover signals are each at a first level and one Switching between the second level; and a time difference computing unit electrically connecting the satellite module to receive the pulse signal, and preset a reference time according to the time information, and electrically connecting the zero-crossing detection circuit to receive the First to third zero-crossing signals, and detecting a time point at which the voltages of the first to third zero-crossing signals after the reference time are switched from the first second level to the first level Taking the first to third times respectively, and subtracting the reference time from the first to third time, respectively, to obtain first to third time differences, wherein the first to third time differences are respectively related to the first time First to third phases of the first to third power signals.

Preferably, the detection module further includes: a phase operation unit pre-stores frequency information of each of the first to third power signals, and electrically connects the time difference operation unit to receive the first to third time differences, and The first to third time differences are respectively calculated with the frequency information of the first to third power signals to obtain first to third phases of the first to third power signals.

The invention has the effect of measuring the phase and amplitude of the first to third power signals without directly contacting the first to third power lines.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of FIG.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2 and FIG. 3, the first preferred embodiment of the wireless measuring device DET of the present invention comprises a satellite module SATM, a wireless sensing module SM and a detecting module DETM.

The satellite module SATM is configured to receive a satellite signal with time information and output a pulse signal having the time information.

The wireless sensing module SM is configured to sequentially sense a first to third power signals transmitted by the first to third power lines L1, L2, and L3 to generate a waveform that changes according to the waveforms of the first to third power signals. A first to third sensing signal.

The wireless sensing module SM includes an antenna 11 , a capacitor 12 , and a voltage follower 13 . The antenna 11 is configured to sense the first to third power signals, and respectively generate a first to third induced currents, and the magnitudes and phases of the first to third induced currents are respectively related to the first to the third The size and phase of the three power signals. The capacitor 12 has a first end electrically connected to the antenna 11 for receiving the first to third induced currents, and a grounded second end, and the capacitor 12 is charged by the first to third induced currents respectively Correspondingly, generating first to third induced voltages from the first ends thereof, wherein the magnitudes and phases of the first to third induced voltages are related to the sizes and phases of the first to third power signals.

The voltage follower 13 is electrically connected to the first end of the capacitor 12 to receive the first to third induced voltages, and correspondingly generate the first to third sensing signals respectively, and the first to the third The magnitude and phase of the three inductive signals are related to the magnitude and phase of the first to third induced voltages, respectively.

The detection module DETM includes a zero-crossing detection circuit 2, a time difference operation unit 3, and a phase operation unit 4.

The zero-crossing detection circuit 2 is electrically connected to the wireless sensing module SM for receiving the first to third sensing signals output by the wireless sensing module (SM), and outputs one of the first to third sensing signals received one by one. The first to third zero-crossing signals, and the voltages of the first to third zero-crossing signals are switched between a first level and a second level.

In the preferred embodiment, the zero-crossing detection circuit 2 includes an operational amplifier OP2 and a resistor R.

The operational amplifier OP2 has an inverting input terminal (-) electrically connected to the voltage follower 13 to receive the first to third inductive signals, a grounded non-inverting input terminal (+), and a The output of the first to third zero crossover signals.

The resistor R is electrically coupled between the inverting input terminal (-) of the operational amplifier and the output terminal.

The voltages of the first, second, and third zero-crossing signals respectively have the first level when the amplitudes of the first, second, and third sensing signals are greater than the ground potential, as shown in FIG. 4, and The first, second, and third sensing signals have the second level when the amplitude of the first, second, and third sensing signals is less than the ground potential.

The time difference computing unit 3 is electrically connected to the satellite module SATM to receive each pulse wave signal, and takes one time of the received one of the pulse wave signals as the reference time, and electrically connects the zero-crossing detecting circuit 2 Receiving the first to third zero-crossing signals, and after the reference time, switching the voltages of the first to third zero-crossing signals from the first one of the second levels to one of the first levels The first to third times t1, t2, and t3 are respectively subtracted from the reference time tref to obtain first to third time differences Δt1=t1 indicating first to third phases of the first to third power signals, respectively. -tref, Δt2=t2-tref, Δt3=t3-tref.

The phase operation unit 4 prestores the frequency information of each of the first to third power signals, and electrically connects the time difference operation unit 3 to receive the first to third time differences, and the first to third time difference Δt1 And Δt2 and Δt3 respectively calculate frequency information f of the first to third power signals to obtain first to third phases of the first to third power signals.

The first embodiment of the phase operation unit 4 operates the first to third phases P ₁ , P ₂ , P ₃ as follows: P ₁ = 360° - Δ t 1 × f × 360°, P ₂ = 360° - △ t 2 × f × 360 °, P 3 = 360 ° - △ t 3 × f × 360 °, wherein the frequency information f in Taiwan to 60Hz.

Referring to FIG. 5, for example, since the first to third power signals are separated by a phase angle of 120 degrees, the first to third power signals can be respectively represented as Asin(ω t+θ), Asin (ω t + θ + 120 °) and Asin (ω t + θ + 240 °) three sine wave signals, and the amplitude of the first, second, and third induced voltage (or inductive signal) are sequentially followed by proportional The amplitudes of the first, second, and third power signals vary, so that FIG. 5 can also be used to indicate amplitude changes of the first, second, and third induced voltages (or inductive signals), wherein the parameter A represents the power signals. The voltage value, the parameter ω = 2 π × f = 2 π × 60 = 120 π.

Assume that when the reference time tref=0 is received, 0 minutes and 2.083 milliseconds are received. After the pulse signal, the voltages of the first to third zero-crossing signals are switched from the first second level to the first to third times t1, t2, and t3 of the first level. T1=0°0 minutes 16.667 milliseconds, t2=0 points 0 minutes 11.111 milliseconds, and t3=0 hours 0 minutes 5.555 milliseconds, the first to third time t1, t2, t3 minus the reference time tref=0 0 minutes 2.083 msec, to obtain the first to third time difference Δt1=16.667-2.083=14.584 msec, Δt2=11.111-2.083=9.028 msec, Δt3=5.555-2.083=3.472 msec, then the first to third phase P1 = 360 ° - Δt1 × 60 × 360 ° = 45 °, P2 = 360 ° - Δt2 × 60 × 360 ° = 165 ° and P3 = 360 ° - Δt3 × 60 × 360 ° = 285 °.

The second embodiment of the phase operation unit 4 operates the first to third phases P1, P2, and P3 as follows: P ₁ = - Δ t 1 × f × 360°, P ₂ = - Δ t 2 × f × 360°, P ₃ = - Δ t 3 × f × 360°.

Following the above example, the phases P1 of the first to third power signals are - Δt1 × 60 × 360 ° = -315 °, P2 = - Δt2 × 60 × 360 ° = -195 ° and P3 = - Δt3 × 60 × 360 ° = -75 °.

The third embodiment of the phase operation unit 4 operates the first to third phases P1, P2, P3 as follows: P ₁ = ( t 1 - t 1) × f × 360°, P ₂ = ( t 1- t 2) × f × 360°, P ₃ = ( t 1 - t 3) × f × 360°.

Following the above example, the first to third phases P1 = 0, P2 = 120, and P3 = 240.

Referring to FIG. 6, the wireless measuring devices DET1 and DET2 of the two first preferred embodiments are used to explain how each power line L1, L2, L3 located at a second location is from the first location. Which of the first to third power lines L1, L2, and L3 (known as R, T, and S lines, respectively) extends.

The first location is, for example, a power distribution room, and the first power line L1 at the first location is known as an R line, the second power line L2 is known as a T line, and the third power line L3 is known as an S line. However, since the R, T, and S lines extend from the first location to the second location via the underground, it is not known that the first to third power lines L1, L2, and L3 correspond to R, respectively. Which of the T and S lines may occur, for example, if the S line is mistaken as the R line, resulting in a short circuit.

However, the phase P1, P2, P3 of the power signals transmitted by the power lines L1, L2, L3 are measured by the wireless measuring device DET1 at the first location, and the reference time tref and the same The information of the phases P1, P2, and P3 is transmitted to the second location, and the wireless measurement device DET2 located at the second location is based on the phases P1', P2', P3' recorded by the reference time tref Receiving the phase P1, P2, and P3 from the first location, it can be known that the first and second locations have the same two phases P1=P1', P2=P2', and P3, respectively. The power lines L1, L2, and L3 of =P3' are the same, and there is no misconnection.

For example, the phase P2′=θ° obtained by the second power line L2 located at the second location is measured, and the phase of the S line of the first location is θ°=P2′, and the second location is located at the second location. The second power line L2 is the S line.

However, it is worth noting that the two phase operation units 4 of the two wireless measuring devices DET1 and DET2 must all adopt the same implementation manner to obtain a correct judgment result based on the same comparison reference.

Further, since the phases P1, P2, and P3 of the first to third power lines L1, L2, and L3 are calculated by using the first to third time differences Δt1, Δt2, and Δt3, they may be via the Comparing the first to third time differences Δt1, Δt2, Δt3 measured by the two wireless measuring devices DET1, DET2, and generating the second location having the same first time difference Δt1 as the first location The power line L1 is determined to be the first power line L1. Similarly, the second and third power lines L2 and L3 may be the second and third power lines L2 and L3 of the first location.

For example, the second time difference obtained by measuring the second power line L2 located at the second location is 2 milliseconds, and the time difference of the S line quantity of the first location is also 2 milliseconds, and the second location is The second power line L2 is an S line.

Referring to FIG. 8, the second preferred embodiment of the wireless measuring device DET differs from the first preferred embodiment in that it further includes a voltage detecting circuit VDEC.

The voltage detecting circuit VDEC is electrically connected to the voltage follower 13 to receive the first to third sensing signals, and sequentially generates first to third amplitude changes that follow the first to third sensing signals, respectively. And the changing digit code.

The voltage detecting circuit VDEC includes an amplifier 5 and an analog-to-digital converter 6.

The amplifier 5 is electrically connected to the voltage follower 13 to receive the first to third sensing signals, and the first to third sensing signals are amplified by a predetermined ratio.

The analog-to-digital converter 6 is electrically connected to the amplifier 5 to receive the amplified first to third inductive signals and analog-to-digital conversion to obtain the first to third digit codes.

Since each digit code is larger, it represents that each of the amplified inductive signals corresponding thereto is larger, and each of the amplified inductive signals is proportional to the amplitude of each of the inductive signals from which it is derived, and the inductive signal is The amplitude of the digital signal is positively correlated with the amplitude of the power signal sensed by the wireless sensing module SM. Therefore, when the digital code is larger, the voltage representing the power signal is higher, and special attention must be paid to safety.

Referring to FIG. 9 to FIG. 11, the third preferred embodiment of the wireless measuring device DET of the present invention differs from the second preferred embodiment (see FIG. 8) in that: 1. The third preferred embodiment further includes a The synchronization module SYNM; and 2. The time difference operation unit 3' is electrically connected to the synchronization module SYNM to receive a synchronization signal and a compensation time difference, and accordingly generate the reference time.

The synchronization module SYNM is electrically connected to the satellite module SATM to receive the pulse signal, and one of the received pulse signals is used as an initialization signal, and starts to oscillate upon receiving the initialization signal to generate a pre- A synchronization signal having a frequency substantially the same as a frequency of the pulse signal is set, and the synchronization signal and the pulse signal are compared to obtain the compensation time difference. In more detail, the compensation time difference is related to a time difference from a first time when the initialization signal is received to a second time when the synchronization signal is started.

The synchronization module SYNM includes an oscillator 31 and a compensation operator 32.

The oscillator 31 is electrically connected to the satellite module SATM and used to generate the synchronization signal, and the voltage of the synchronization signal is switched between a first level and a second level. However, since the oscillator 31 starts to oscillate when the pulse signal is received to generate the synchronization signal, the preset frequency of the synchronization signal is substantially equal to the frequency of the pulse signal, but as shown in FIG. The compensation time difference δ will still occur for the above reasons.

The compensation operator 32 is electrically connected to the oscillator 31 to receive the clock signal, and is electrically connected to the satellite module SATM to receive each pulse signal, and stores the time when one of the pulse signals is received as a reference time. Tb, and storing the first time after the reference time is switched from the first level to the second level, and switching the switching time ts to the reference time tb. To generate the compensation time difference δ=ts-tb.

The time difference computing unit 3' is electrically connected to the synchronization module SYNM to receive the compensation time difference and the synchronization signal, and preset a reference time according to a time information of the synchronization signal and the compensation time difference, and more specifically, the time difference The transport unit 3' is a switching time ts' (ie, the time information) for switching the synchronization signal from the first level to the second level, minus the compensation time difference δ to generate the reference time tref=ts' - δ, and the first to third time differences are obtained based on the same manner as the third preferred embodiment.

The effect of the third preferred embodiment over the first and second preferred embodiments is that the synchronization signal can be generated in an environment where satellite signals are received, and in an environment where satellite signals are not received (for example, indoors). Using the synchronization signal and the compensation time difference to obtain the reference time tref substantially equivalent to the first and second preferred embodiments, the first to the first to third phases can be similarly calculated. A third time difference.

In summary, the above embodiment has the following advantages:

1. The first to third preferred embodiments are capable of measuring the first to third phases of the first to third power signals without direct contact.

2. The second preferred embodiment is also capable of measuring the amplitude (i.e., voltage) of the first to third power signals without direct contact, thereby ensuring safety.

3. The oscillator 31 of the third preferred embodiment can generate the synchronization signal for replacing the satellite signal, so that the first to third phases and voltages can be obtained even in a closed environment, so The object of the invention is achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

L1. . . First power line

L2. . . Second power line

L3. . . Third power line

SATM. . . Satellite module

SM. . . Wireless sensor module

11. . . antenna

12. . . capacitance

13. . . Voltage follower

DETM. . . Detection module

2. . . Zero crossover detection circuit

OP2. . . Operational Amplifier

R. . . resistance

3. . . Time difference unit

3’. . . Time difference unit

SYNM. . . Synchronization module

31. . . Oscillator

32. . . Compensation operator

4. . . Phase arithmetic unit

VDEC. . . Voltage detection circuit

5. . . Amplifier

6. . . Analog digital converter

Figure 1 is a schematic view showing a first to third power line;

Figure 2 is a schematic view showing a first preferred embodiment of the wireless measuring device of the present invention;

3 is a signal diagram illustrating the relationship between a first to third inductive signals of the first preferred embodiment;

4 is a signal diagram showing the relationship between each inductive signal of the first preferred embodiment and a corresponding zero-crossing signal;

Figure 5 is a signal diagram showing a first to a third time difference from a reference time and a first to a third time;

6 is a schematic diagram showing a manner of confirming the first to third power lines by using the wireless measuring devices of the first preferred embodiment;

7 is a schematic diagram showing another manner of confirming the first to third power lines by using the wireless measuring devices of the first preferred embodiment;

Figure 8 is a schematic view showing a second preferred embodiment of the wireless measuring device of the present invention;

Figure 9 is a schematic view showing a third preferred embodiment of the wireless measuring device of the present invention;

FIG. 10 is a signal diagram illustrating the relationship between a reference time, a switching time, and a compensation time difference in the third preferred embodiment; and

FIG. 11 is a signal diagram illustrating the fourth preferred embodiment calculating the reference time based on a switching time, the compensation time difference, and the first time.

L1. . . First power line

L2. . . Second power line

L3. . . Third power line

SATM. . . Satellite module

SM. . . Wireless sensor module

11. . . antenna

12. . . capacitance

13. . . Voltage follower

DETM. . . Detection module

2. . . Zero crossover detection circuit

OP2. . . Operational Amplifier

R. . . resistance

3. . . Time difference unit

4. . . Phase arithmetic unit

VDEC. . . Voltage detection circuit

5. . . Amplifier

6. . . Analog digital converter

Claims (24)

A wireless measuring device comprises: a satellite module for receiving a satellite signal with time information, and outputting a pulse signal having the time information; and a wireless sensing module for sensing the first a first to third power signals transmitted by the first to third power lines to generate a first to third sensing signals that change in accordance with the waveforms of the first to third power signals; and a detecting module, including a zero-crossing detection circuit electrically connected to the wireless sensing module for receiving the first to third sensing signals output by the wireless sensing module, and outputting the first to third sensing signals received one by one First to third zero-crossing signals, and the voltages of the first to third zero-crossing signals are switched between a first level and a second level; and a time difference computing unit electrically connecting the satellite modes The group receives the pulse wave signal, and presets a reference time according to the time information, and electrically connects the zero-crossover detecting circuit to receive the first to third zero-crossing signals, and detects after the reference time The first to third zero crossover signals Pressing the time point from the first second level to the first level as the first to third time, respectively, and subtracting the reference time from the first to third time respectively to obtain the first to a third time difference, wherein the first to third time differences are respectively related to the first to third phases of the first to third power signals. The wireless measuring device according to claim 1, wherein the detecting module further comprises: a phase operation unit pre-stores frequency information of each of the first to third power signals, and electrically connects the time difference operation unit to receive the first to third time differences, and respectively respectively, the first to third time differences The frequency information of the first to third power signals is calculated to obtain first to third phases of the first to third power signals. The wireless measuring device according to claim 2, wherein the first phase P ₁ , the second phase P ₂ and the third phase P ₃ are calculated as follows: P ₁ =360°-Δ t 1 × f × 360°, P ₂ = 360° - △ t 2 × f × 360°, P ₃ = 360° - △ t 3 × f × 360°, where f is the frequency information, parameter Δt1~△t3 These are the first to third time differences, respectively. The wireless measuring device according to claim 2, wherein the first phase P ₁ , the second phase P ₂ and the third phase P ₃ are calculated as follows: P ₁ =−Δ t 1× f ×360°, P ₂ =−Δ t 2× f ×360°, P ₃ =−△ t 3× f ×360°, where f is the frequency information, and the parameters Δt1~Δt3 are the first to A third time difference. The wireless measuring device according to claim 2, wherein the first phase P ₁ , the second phase P ₂ and the third phase P ₃ are calculated as follows: P ₁ = (Δ t 1-Δ t 1) × f × 360°, P ₂ = (Δ t 1-Δ t 2) × f × 360°, P ₃ = (Δ t 1-Δ t 3) × f × 360°, where f is the The frequency information, the parameters Δt1~Δt3 are the first to third time differences respectively. The wireless measuring device of claim 1, wherein the wireless sensing module comprises: an antenna for sensing the first to third power signals, and correspondingly generating a first to third Inducing current, and the magnitude and phase of the first to third induced currents are respectively related to the size and phase of the first to third power signals; and a capacitor having an electrical connection to the antenna to receive the first to third a first end of the induced current, and a grounded second end, and the capacitor is charged by the first to third induced currents to respectively generate first to third induced voltages from the first end thereof, and the first The magnitude and phase of the third induced voltage are related to the magnitude and phase of the first to third power signals; and a voltage follower is electrically connected to the first end of the capacitor to receive the first to third induced voltages And respectively generating the first to third sensing signals correspondingly, and the sizes and phases of the first to third sensing signals are respectively related to the magnitude and phase of the first to third sensing voltages. The wireless measuring device according to claim 1, wherein the zero-crossing detecting circuit comprises: an operational amplifier having an electrical connection to the voltage follower to receive the first to third inductive signals An inverting input terminal, a grounded non-inverting input terminal, and an output terminal for providing the first to third zero-crossing signals; and a resistor electrically connected to the inverting input terminal of the operational amplifier and the output Between the ends. The wireless measuring device according to claim 1, wherein the detecting module further comprises: a voltage detecting circuit connected to the voltage follower to receive the first to third sensing signals, and according to This sequentially generates a first to third digital code which is changed in proportion to the amplitude change of the first to third inductive signals, respectively. The wireless measuring device according to claim 8, wherein the voltage detecting circuit comprises: an amplifier electrically connected to the voltage follower to receive the first to third sensing signals, and the first to the third The three sensing signals are amplified according to a preset ratio; and an analog-to-digital converter is electrically connected to the amplifier to receive the amplified first to third sensing signals, and analog-to-digital conversion is performed to obtain the first to The third digit code. The wireless measuring device according to claim 1, wherein the first level is a high voltage level and the second level is a low voltage level. The wireless measuring device according to claim 1, wherein the satellite signal has one pulse wave signal per second, and the time difference computing unit uses one time of the received one of the pulse wave signals as the Reference time. A wireless measuring device comprises: a satellite module for receiving a satellite signal with time information, and outputting a pulse signal having the time information; and a synchronization module electrically connecting the satellite module Receiving the pulse signal, and receiving the pulse signal as one of the initialization signals, and starting to oscillate when receiving the initialization signal, to generate a frequency whose preset frequency is substantially the same as the pulse signal a synchronization signal, and a compensation time difference is obtained for the synchronization signal and the pulse signal; a wireless sensing module is configured to sequentially sense a first to third power signals transmitted by the first to third power lines, a first to third inductive signal that changes in accordance with a waveform of the first to third power signals; and a detecting module comprising: a zero-crossing detecting circuit electrically connected to the wireless sensing module Receiving the first to third inductive signals outputted by the first to third inductive signals, and sequentially outputting the first to third zero crossover signals by using the received first to third inductive signals, and the first to third zero The voltage of the signal is switched between a first level and a second level; and a time difference computing unit electrically connects the satellite module to receive the pulse signal, and presets a reference time according to the time information. And electrically connecting the zero-crossing detection circuit to receive the first to third zero-crossing signals, and detecting the voltages of the first to third zero-crossing signals after the reference time from the first one The time points at which the two levels are switched to the first level are respectively taken as the first to third times, and the first to third times are respectively subtracted from the reference time to obtain the first to third time differences, wherein The first to third time differences are respectively related to the first to third phases of the first to third power signals. The wireless measuring device according to claim 12, wherein the detecting module further comprises: a phase computing unit pre-storing frequency information of each of the first to third power signals, and electrically connecting the The time difference operation unit receives the first to third time differences, and operates the first to third time difference respectively with the frequency information of the first to third power signals to obtain the first to third power signals. The first to third phases. The wireless measuring device according to claim 13, wherein the first phase P ₁ , the second phase P ₂ and the third phase P ₃ are calculated as follows: P ₁ =360°-Δ t 1 × f × 360°, P ₂ = 360° - △ t 2 × f × 360°, P ₃ = 360° - △ t 3 × f × 360°, where f is the frequency information, parameter Δt1~△t3 These are the first to third time differences, respectively. The wireless measuring device according to claim 13, wherein the first phase P ₁ , the second phase P ₂ and the third phase P ₃ are calculated as follows: P ₁ =−Δ t 1× f ×360°, P ₂ =−Δ t 2× f ×360°, P ₃ =−△ t 3× f ×360°, where f is the frequency information, and the parameters Δt1~Δt3 are the first to A third time difference. The wireless measuring device according to claim 13, wherein the first phase P ₁ , the second phase P ₂ and the third phase P ₃ are calculated as follows: P ₁ = (Δ t 1-Δ t 1) × f × 360 ° , P 2 = (△ t 1- △ t 2) × f × 360 °, P 3 = (△ t 1- △ t 3) × f × 360 °, wherein, f for The frequency information, the parameters Δt1~Δt3 are the first to third time differences respectively. The wireless measuring device of claim 12, wherein the wireless sensing module comprises: an antenna for sensing the first to third power signals, and correspondingly generating a first to third Inducing current, and the magnitude and phase of the first to third induced currents are respectively related to the size and phase of the first to third power signals; and a capacitor having an electrical connection to the antenna to receive the first to third a first end of the induced current, and a grounded second end, and the capacitor is charged by the first to third induced currents to respectively generate first to third induced voltages from the first end thereof, and the first The magnitude and phase of the third induced voltage are related to the large of the first to third power signals And a voltage follower, electrically connected to the first end of the capacitor to receive the first to third induced voltages, and correspondingly generating the first to third sensing signals respectively, and The magnitude and phase of the first to third inductive signals are related to the magnitude and phase of the first to third induced voltages, respectively. The wireless measuring device of claim 12, wherein the zero-crossing detecting circuit comprises: an operational amplifier having an electrical connection to the voltage follower to receive the first to third inductive signals An inverting input terminal, a grounded non-inverting input terminal, and an output terminal for providing the first to third zero-crossing signals; and a resistor electrically connected to the inverting input terminal of the operational amplifier and the output Between the ends. The wireless measuring device according to claim 12, wherein the detecting module further comprises: a voltage detecting circuit connected to the voltage follower to receive the first to third sensing signals, and according to This sequentially generates a first to third digital code which is changed in proportion to the amplitude change of the first to third inductive signals, respectively. The wireless measuring device according to claim 19, wherein the voltage detecting circuit comprises: an amplifier electrically connected to the voltage follower to receive the first to third sensing signals, and the first to the third The three sensing signals are amplified by a preset ratio And an analog-to-digital converter electrically connected to the amplifier to receive the amplified first to third inductive signals and analog to digital conversion to obtain the first to third digit codes. The wireless measuring device according to claim 12, wherein the satellite signal has one pulse wave signal per second, and the time difference computing unit uses one time of receiving one of the pulse wave signals as the Reference time. The wireless measuring device according to claim 12, wherein the first level is a high voltage level and the second level is a low voltage level. A detection module includes: a zero-crossing detection circuit electrically connected to a wireless sensing module for receiving a first to third sensing signals output by the wireless sensing module, and utilizing the received first to The third sensing signal sequentially outputs a first to third zero-crossing signal, and the voltages of the first to third zero-crossing signals are switched between a first level and a second level; and a time difference operation The unit is electrically connected to a satellite module to receive a pulse wave signal having a time information, and preset a reference time according to the time information, and electrically connect the zero crossover detecting circuit to receive the first to third zeros Transmitting the signal, and detecting the time when the voltage of the first to third zero crossover signals after the reference time is switched from the first second level to the first level, respectively as the first to a third time, and subtracting the reference time from the first to third time respectively to obtain a first to a third time difference, wherein the first to third time differences are respectively related to the wireless sense The first to third phases of the first to third power signals sensed by the module. The detection module of claim 23, further comprising a phase operation unit for pre-storing frequency information of each of the first to third power signals, and electrically connecting the time difference operation unit to receive the first a first to third time difference, and calculating the first to third time difference respectively with the frequency information of the first to third third power signals to obtain first to third phases of the first to third power signals .