CN204228819U - A kind of electrical network nuclear phase signal generator - Google Patents

Abstract

The utility model discloses a power grid nuclear phase signal generator, which comprises a waveform acquisition transmitter and a waveform receiving simulator; A transmitting unit, a triggering unit, a battery management voltage stabilizing unit, and a transmitting control unit; wherein, the sensing terminal, the limiting protection module unit, the filtering unit, the comparison shaping unit, and the FSK modulation transmitting unit are connected in sequence, and the limiting protection unit is also The trigger unit is connected to the battery voltage stabilizing unit; the battery management voltage stabilizing unit is also connected to the filter unit, the comparison and shaping unit, the modulation transmitting unit and the control unit; the control unit is also connected to the modulation transmitting unit. The utility model can still carry out phase nuclear auxiliary work in the case of power failure of the line, and solves the problem that the current phase nuclear instrument cannot complete the detection of the phase sequence of the power grid under the power failure of the power grid.

Description

A power grid nuclear phase signal generator

technical field

The utility model discloses a power grid nuclear phase signal generator, which relates to the technical field of power grid monitoring.

Background technique

A phase checker is an instrument used to check the phase of the power system, and can check the existence of the rated voltage. It is a portable device used to detect and indicate the correct phase relationship between two charged parts under the same rated voltage and frequency. The existing phase nuclear devices mainly include wired phase nuclear devices, wireless phase nuclear devices, and pointer type phase nuclear devices device and digital nuclear phase device.

The nuclear phase detectors in the prior art, such as the nuclear phase rod, are all under the operating voltage to perform the phase verification work of the high-voltage power line and distinguish the different phases of the three phases, which belong to the live test tool. The phase nuclear devices in the prior art, such as the sound nuclear phase device disclosed in the patent No. 201320539506.0, and a high-voltage phase nuclear device disclosed in the patent No. 201420034173.0, all need to be operated and used under electrified working conditions. Most of the nuclear phase detectors cannot complete the detection function of the phase sequence of the power grid under the power outage of the power grid.

The working voltage of the power grid is usually relatively high, and high-voltage live working is very dangerous, often causing serious personal injury to maintenance personnel. Even if protection is carried out by various insulation measures in the prior art, it is difficult to thoroughly avoid the hidden dangers that live work brings.

In the prior art, there is a lack of a device that can perform phase verification in the state of line power failure.

Utility model content

The technical problem to be solved by the utility model is: aiming at the defects of the prior art, to provide a power grid nuclear phase signal generator, specifically to provide a kind of nuclear phase auxiliary device which can be carried out under the power failure of the line.

The utility model adopts the following technical solutions for solving the above-mentioned technical problems:

A power grid nuclear phase signal generator, including a waveform acquisition transmitter and a waveform receiving simulator;

The waveform acquisition transmitter includes a sensing terminal, a limiter protection module unit, a transmission filter unit, a comparison shaping unit, a modulation transmission unit, a trigger unit, a battery management voltage stabilization unit, and a transmission control unit;

Wherein, the sensing terminal, the limit protection module unit, the filter unit, the comparison shaping unit, and the FSK modulation transmitting unit are connected in sequence, and the limit protection unit is also connected to the battery voltage stabilizing unit through the trigger unit;

The battery management voltage stabilizing unit is also connected to the filtering unit, the comparison and shaping unit, the modulation transmitting unit and the control unit respectively;

The control unit is also connected to the modulation and transmission unit;

The waveform simulation receiver includes a power management voltage stabilization unit, a receiving control unit, a demodulation receiving unit, a waveform generator, a receiving filter unit, a waveform driving unit, and an output terminal;

The demodulation receiving unit, the waveform generator, the receiving filter unit, the waveform driving unit, and the output terminal are connected in sequence;

The power management voltage stabilizing unit is respectively connected with the demodulation receiving unit, the waveform generator, the receiving filter unit, the waveform driving unit and the receiving control unit;

The receiving control unit is also connected to the demodulation receiving unit;

Place the waveform acquisition transmitter on the test point of the live line, and place the waveform receiving simulator on another measurement point of the uncharged line; the inductive terminal of the waveform acquisition transmitter obtains the voltage signal of the live test point by induction, the The voltage signal is firstly filtered by the transmitting filter unit to filter out the harmonic signal, and then the voltage signal enters the comparison shaping unit to convert the sine wave signal of the voltage signal into a square wave signal, and the square wave signal enters the modulating transmitting unit, and the modulating transmitting unit will The square wave signal is modulated into a carrier frequency signal in real time and transmitted;

The waveform simulation receiver receives the signal transmitted by the waveform acquisition transmitter through the demodulation receiving unit, and demodulates the received signal through the demodulation receiving unit. After the demodulated signal passes through the frequency and phase adjustable generator, the frequency and phase can be adjusted to generate The converter generates a sine wave signal with the same phase and frequency as the signal according to the demodulated signal. After the sine wave signal enters the receiving filter unit for filtering, it is amplified by the waveform drive unit and output to the uncharged circuit through the output terminal. in line.

As a further optimization scheme of the present invention, the modulation and transmitting unit adopts a frequency shift keying modulation method.

As a further optimization solution of the utility model, the sensing terminal adopts a metal probe sensor.

As a further optimization solution of the present invention, the transmitting filter unit adopts an active low-pass filter.

As a further optimization solution of the present invention, the comparison shaping unit adopts a hysteresis comparator.

As a further optimization solution of the present invention, the receiving filter unit adopts a third-order RC filter.

As a further optimization scheme of the utility model, the waveform driving unit adopts an OTL power amplifier circuit.

As a further optimization solution of the present invention, the waveform simulation receiver further includes a resistive coupling circuit, and the filter drive unit is connected to the output terminal through the resistive coupling circuit.

Compared with the prior art, the utility model adopts the above technical scheme and has the following technical effects: the utility model can still carry out nuclear phase auxiliary work in the case of a power outage of the line, and solves the problem that the current nuclear phase instrument cannot complete the power grid under the grid power failure. For the detection of phase sequence, the device is suitable for use in power outage lines such as overhead lines and cable lines in conjunction with a phase nuclear instrument.

Description of drawings

Fig. 1 is a schematic diagram of the signal waveform of the waveform acquisition transmitter in the utility model.

Fig. 2 is a schematic diagram of the module connection of the waveform acquisition transmitter in the utility model.

Fig. 3 is a schematic diagram of the signal waveform of the waveform simulation receiver in the present invention.

Fig. 4 is a schematic diagram of the module connection of the waveform simulation receiver in the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the technical scheme of the utility model is described in further detail:

The working principle of the present utility model is specifically as follows:

At both ends of the power outage line, one end is charged M line, the other end is not charged N line, the power frequency waveform acquisition transmitter is placed on the live end test point, and the waveform receiving simulator is placed on the other end uncharged measurement point, the waveform The acquisition transmitter senses the voltage signal on the charged M line through induction, and outputs a square wave signal with the same phase and frequency through the internal filtering, shaping, and zero-crossing comparison circuits, and directly modulates the wireless digital module configured by the MCU. The module direct mode transmits the phase information in real time. Since the configuration channel and demodulation mode of the wireless digital module of the waveform receiving simulator are the same as those of the transmitter, and it is in the real-time monitoring state, when the same carrier signal is received and successfully demodulated Finally, the frequency and phase adjustable generator is input in real time to realize real-time simulation of a sine wave signal with the same phase and frequency. After filtering, the input waveform drive unit is amplified, and finally outputs a 110V sine wave signal with the same frequency and phase through the resistance method. It is directly coupled to the uncharged N line to ensure that the analog output waveform and the induction signal waveform, that is, the M and N line phases maintain a real-time synchronous and consistent relationship, and realize the simulation task of the model.

In the utility model, the module connection schematic diagrams of the waveform acquisition transmitter and the module connection schematic diagrams of the waveform simulation receiver are shown in Fig. 2 and Fig. 4 respectively. The power grid nuclear phase signal generator includes a waveform acquisition transmitter and a waveform receiving simulator; the waveform acquisition transmitter includes an induction terminal, a limiter protection module unit, a transmission filter unit, a comparison shaping unit, a modulation transmission unit, and a trigger unit , a battery management voltage stabilizing unit, and a launch control unit; wherein, the sensing terminal, the limiter protection module unit, the filter unit, the comparison shaping unit, and the FSK modulation launch unit are connected in sequence, and the limiter protection unit is also connected to the battery through the trigger unit The voltage stabilizing unit is connected; the battery management voltage stabilizing unit is also connected to the filter unit, the comparison shaping unit, the modulation transmitting unit and the control unit; the control unit is also connected to the modulation transmitting unit; the waveform simulation receiver includes a power management Voltage stabilizing unit, receiving control unit, demodulation receiving unit, waveform generator, receiving filter unit, waveform drive unit, output terminal; said demodulation receiving unit, waveform generator, receiving filter unit, waveform drive unit, output terminal in sequence connected; the power management voltage stabilization unit is respectively connected with the demodulation receiving unit, waveform generator, receiving filter unit, waveform drive unit and receiving control unit; the receiving control unit is also connected with the demodulation receiving unit; the waveform acquisition and transmission The transmitter is placed on the test point of the live line, and the waveform receiving simulator is placed on the measurement point of another uncharged line; the inductive terminal of the waveform acquisition transmitter obtains the voltage signal of the live test point through induction, and the voltage signal first passes through The filtering of the transmitting filter unit filters out the harmonic signal, and then the voltage signal enters the comparison shaping unit to convert the sine wave signal of the voltage signal into a square wave signal, and the square wave signal enters the modulation transmitting unit, and the modulation transmitting unit converts the square wave signal in real time It is modulated into a carrier frequency signal and transmitted; the waveform simulation receiver receives the signal transmitted by the waveform acquisition transmitter through the demodulation receiving unit, and demodulates the received signal through the demodulation receiving unit. After the generator is tuned, the frequency and phase adjustable generator generates a sine wave signal with the same phase and frequency as the signal according to the demodulated signal. The sine wave signal enters the receiving filter unit for filtering, and then passes through the waveform drive unit Amplified, output to the uncharged line through the output terminal.

The waveform acquisition transmitter is mainly composed of: sensing terminal, limiter protection unit, filter unit, comparison shaping unit, FSK modulation transmission unit, trigger unit, battery management voltage stabilization unit, MCU controller. Its working principle is: under normal no-signal conditions, the phase waveform acquisition transmitter does not work and is in the shutdown state. When it comes into contact with the high-voltage signal of the power grid, a certain amplitude of the power grid voltage signal is sensed on the sensing terminal. , enter the next level reliably, when the amplitude of the sensing signal is greater than a certain value, the trigger unit circuit enables the battery management voltage regulator unit circuit, the whole circuit works, the MCU controller completes the configuration task of the straight-through working mode of the FSK modulation transmitting unit, and the sensing signal passes through the low-pass The filter unit adopts a zero-crossing comparison circuit to realize the conversion of sine wave to square wave, and the square wave signal is output to the modulation transmitting unit, and the carrier frequency signal is modulated in real time by FSK mode to achieve the real-time transmission of the waveform phase. When the waveform acquisition transmitter is working, the waveform diagrams of the corresponding power grid signal, modulation signal and transmission signal are shown in Figure 1. As a further optimization solution of the utility model, the sensing terminal adopts a metal probe sensor.

Among the various module components of the waveform acquisition transmitter:

Induction terminal: through the principle of electromagnetic induction, the metal probe is used to complete the reception of the original signal.

Limiting protection unit: due to different power grid voltage levels and different surrounding electric fields, the induction intensity changes greatly. In order to ensure that the receiving circuit is damaged due to excessive moving signals, a transient suppression diode with low junction capacitance parameters is used to complete the detection of the front-end induction signal amplitude. The limitation of the signal plays a role in protecting the back-end circuit without affecting the signal phase parameters.

Filtering unit: According to the actual grid situation, the instability of the induction signal, the grid fluctuation, and the grid harmonic arcing will cause the accuracy and stability of the phase detection. The utility model adopts an active low-pass filter, and the operational amplifier Realized with RC to filter out frequency signals above 0.5KHz to prevent various harmonic signals in the power grid from affecting the zero-crossing comparison unit. As a further optimization solution of the present invention, the transmitting filter unit adopts an active low-pass filter.

Comparing shaping unit: It mainly completes the zero-crossing detection function of the induction signal. The circuit uses a low-power integrated operational amplifier to realize the hysteresis comparator, and completes the conversion task of the induction signal from sine wave to square wave. As a further optimization solution of the present invention, the comparison shaping unit adopts a hysteresis comparator.

FSK modulation transmitter unit: In order to ensure that the phase information of the detected induction signal is transmitted to the receiving end in real time, and restore the original signal in real time, to ensure the minimum phase error between the two, this paper uses the SI4432 wireless module and initializes it under FSK modulation through MCU control. In the OOK direct mode, the sensing signal is filtered and converted into a square wave signal, and then directly input to the direct pin of the wireless module, and the real-time sensing signal is modulated and transmitted in real time. As a further optimization scheme of the present invention, the modulation and transmitting unit adopts a frequency shift keying modulation method.

Trigger unit: automatically turn on or off the waveform acquisition transmitter function under the presence or absence of the sensing signal, use a low-power comparator, judge the strength of the sensing signal, and start the power supply when the sensing signal amplitude is greater than the default setting threshold Start to work, otherwise turn off the power and complete the task of automatically switching on and off according to the induction signal.

Battery management voltage regulator unit: HT7133 low-power LDO voltage regulator chip is used to realize the voltage regulation function of the entire transmitter.

MCU controller: C8051F330 single-chip microcomputer is used to complete the configuration function of the communication mode of the SI4432 wireless module.

The waveform simulation receiver is mainly composed of a power management voltage stabilizing unit, an MCU controller, an FSK demodulation receiving unit, a square wave generator with adjustable frequency and phase, a filtering unit, a waveform driving unit, and an output terminal. Its working principle is: after power-on, the MCU controller initializes the wireless digital module, completes the direct mode configuration, and is in the real-time monitoring state. When the same carrier signal is received and successfully demodulated, the input frequency and phase adjustable generator , real-time simulation of a sine wave signal of the same phase and frequency, after filtering, the input waveform drive unit amplifies, and finally outputs a 110V sine wave signal of the same frequency and phase, which is directly coupled to the dead line through resistance. When the waveform simulation receiver is working, the corresponding grid signal, modulation signal and transmission signal waveform schematic diagram is shown in Figure 3.

Among the various module components of the waveform simulation receiver:

MCU controller: implemented by C8051F330 single-chip microcomputer, it is used to initialize and configure the wireless digital module.

FSK demodulation receiving unit: configure the FSK modulation transmitting unit in the waveform acquisition transmitter I to complete the real-time demodulation of the transmitted carrier signal and output a square wave to restore the modulated signal.

Frequency and phase adjustable square wave generator: complete the conversion from received square wave to sine wave, according to the power grid frequency range between 45Hz-65Hz, and the frequency spectrum of square wave signal, by filtering out 3, 5, 7 and other higher harmonics Components, you can get a sine wave, using a 3rd-order RC filter, through a first-stage adjustable phase-shifting operational amplifier circuit, through fine-tuning, to ensure that the output sine wave phase is consistent with the square wave phase, and realize the conversion output task from square wave to sine wave.

Waveform drive unit: complete the amplified output of the sine wave, use the OTL power amplifier circuit to amplify the input sine signal, output drive a non-inverting step-up transformer, boost the positive selection signal to a fixed 110V in-phase sine signal, and send it to the output through a resistor terminals.

As a further optimization solution of the present invention, the receiving filter unit adopts a third-order RC filter.

As a further optimization scheme of the utility model, the waveform driving unit adopts an OTL power amplifier circuit.

As a further optimization solution of the present invention, the waveform simulation receiver further includes a resistive coupling circuit, and the filter drive unit is connected to the output terminal through the resistive coupling circuit.

The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned embodiments. Make various changes below.

The above embodiments are only to illustrate the technical idea of the utility model, and cannot limit the protection scope of the utility model. All technical ideas proposed in accordance with the utility model and any changes made on the basis of the technical solutions all fall within the protection scope of the utility model.

Claims (8)

1. an electrical network nuclear phase signal generator, is characterized in that: comprise waveform acquisition transmitter and waveform reception simulator;

Described waveform acquisition transmitter comprises induction terminal, limited amplitude protection modular unit, launches filter unit, compares shaping unit, modulate emission unit, trigger element, battery management voltage regulation unit, emission controlling unit;

Wherein, described induction terminal, limited amplitude protection modular unit, filter unit, compare shaping unit, FSK modulate emission unit is connected successively, described limited amplitude protection unit is also connected with battery voltage regulation unit by trigger element;

Described battery management voltage regulation unit also respectively at filter unit, compare shaping unit, modulate emission unit is connected with control module;

Described control module is also connected with modulate emission unit;

Described waveform modelling receiver comprises power management voltage regulation unit, reception control unit, demodulation receiving element, waveform generator, the unit that accepts filter, drive waveform unit, lead-out terminal;

Described demodulation receiving element, waveform generator, the unit that accepts filter, drive waveform unit, lead-out terminal are connected successively;

Described power management voltage regulation unit is connected with reception control unit with demodulation receiving element, waveform generator, the unit that accepts filter, drive waveform unit respectively;

Described reception control unit is also connected with demodulation receiving element.

2. a kind of electrical network nuclear phase signal generator as claimed in claim 1, is characterized in that: described modulate emission unit adopts shift keying modulation mode.

3. a kind of electrical network nuclear phase signal generator as claimed in claim 1 or 2, is characterized in that: described induction terminal adopts metal probe inductor.

4. a kind of electrical network nuclear phase signal generator as claimed in claim 3, is characterized in that: described transmitting filter unit adopts active low-pass filter.

5. a kind of electrical network nuclear phase signal generator as claimed in claim 4, is characterized in that: the described shaping unit that compares adopts hysteresis comparator.

6. a kind of electrical network nuclear phase signal generator as claimed in claim 5, is characterized in that: described in the unit that accepts filter adopt three rank RC wave filters.

7. a kind of electrical network nuclear phase signal generator as claimed in claim 6, is characterized in that: described drive waveform unit adopts OTL power amplifier.

8. a kind of electrical network nuclear phase signal generator as claimed in claim 7, is characterized in that: described waveform modelling receiver also comprises resistively couple circuit, and described filtering driver element is connected with lead-out terminal by resistively couple circuit.