阅读说明：本技术 一种变电站辐射检测装置 (Radiation detection device of transformer substation ) 是由 高雨 曹真 杜旭凯 张永峰 柳赛飞 王斐 于 2020-12-04 设计创作，主要内容包括：本发明一种变电站辐射检测装置,差分输入单元采用输入匹配网络接收辐射检测仪检测的变电站辐射信号,经共模滤波器滤波后进入差分放大器进一步抑制共模信号、对差模信号放大后输出,鉴频单元通过鉴频器对噪声信号的频率与变压器T3调制后信号频率进行谐振鉴频,频率相同时,输出电压为零,否则输出正或负电压,调制单元将接收的差分输入单元输出信号经限幅、谐频放大后作为调制信号加到变压器T3的初级线圈一端,接收的鉴频单元输出信号输出电压为零时,光电耦合器U1导通,-5V改变震荡器的震荡频率后作为载波信号加到变压器T3的初级线圈另一端,变压器T3调制后再经发射器传送到分析终端,实现在变压器T3调制后信号频率与噪声信号频率相同时进行调节。(The invention relates to a substation radiation detection device, wherein a differential input unit adopts an input matching network to receive substation radiation signals detected by a radiation detector, the substation radiation signals are filtered by a common mode filter and then enter a differential amplifier to further inhibit common mode signals, differential mode signals are amplified and then output, a frequency discrimination unit performs resonance frequency discrimination on the frequency of noise signals and the frequency of signals modulated by a transformer T3 through a frequency discriminator, the output voltage is zero when the frequency is the same, otherwise, positive or negative voltage is output, the modulation unit performs amplitude limiting and harmonic frequency amplification on the received differential input unit output signals, the signals are used as modulation signals and are added to one end of a primary coil of a transformer T3, when the received output voltage of the frequency discrimination unit output signals is zero, a photoelectric coupler U1 is conducted, 5V changes the oscillation frequency of an oscillator and then is used as a carrier signal and is added to the other end of the primary coil of the transformer T3, the transformer T3 modulates, the adjustment is realized when the signal frequency is the same as the noise signal frequency after the modulation of the transformer T3.)

1. A transformer substation radiation detection device comprises a differential input unit, a frequency discrimination unit and a modulation unit, and is characterized in that the differential input unit receives a transformer substation radiation signal detected by a radiation detector by adopting an input matching network, the transformer substation radiation signal is filtered by a common mode filter and then enters a differential amplifier to further inhibit common mode signals and amplify differential mode signals for output, the frequency discrimination unit carries out resonance frequency discrimination on the frequency of a noise signal and the frequency of a signal modulated by a transformer T3 through a frequency discriminator, the output voltage is zero when the frequencies are the same, otherwise, a positive or negative voltage is output, the modulation unit amplifies the received output signal of the differential input unit through amplitude limiting and harmonic frequency as a modulation signal and adds the modulation signal to one end of a primary coil of the transformer T3, when the output voltage of the received output signal of the frequency discrimination unit is zero, a photoelectric coupler U1 is conducted, 5V is added to an oscillator taking a triode Q3 as, the oscillation frequency of the oscillator is changed and then the signal is used as a carrier signal to be applied to the other end of the primary coil of the transformer T3, and the modulated signal is transmitted to the analysis terminal through the transmitter after being modulated by the transformer T3.

2. The substation radiation detection device according to claim 1, wherein the differential input unit comprises an electrolytic capacitor E1, an electrolytic capacitor E2, an inductor L1 and an inductor L3, wherein a positive electrode of the electrolytic capacitor E1 and an upper end of the inductor L1 are connected to a positive electrode of a substation radiation signal detected by the radiation detector, a lower end of the inductor L1, a negative electrode of the electrolytic capacitor E2 and a left end of the inductor L3 are connected to a negative electrode of a substation radiation signal detected by the radiation detector, a negative electrode of the electrolytic capacitor E1 is connected to a positive electrode of the electrolytic capacitor E2 and a left end of the inductor L2, a right end of the inductor L2 is connected to one end of a resistor R3 and one end of a resistor R1, a right end of the inductor L3 is connected to the other end of a resistor R3 and one end of a resistor R2, another end of the resistor R1 is connected to one end of a capacitor C9, one end of a resistor R4 and an inverting input end of an operational amplifier AR1, and another end of the resistor, The non-inverting input end of the operational amplifier AR1, the output end of the operational amplifier AR1 are respectively connected with the other end of the resistor R4, the anode of the diode D1 and the cathode of the diode D2, the cathode of the diode D1 is connected with a power supply +5V, the anode of the diode D2 is connected with a power supply-5V, and the output end of the operational amplifier AR1 is used for outputting signals by the differential input unit.

3. The substation radiation detection device according to claim 1, wherein the frequency discrimination unit comprises a transistor Q2, a base of the transistor Q2 is connected with a noise signal, an emitter of the transistor Q2 is connected with-5V, a collector of the transistor Q2 is respectively connected with one end of a capacitor C5, one end of a capacitor C7, one end of a primary coil of a transformer T4, the other end of the capacitor C5 is connected with a negative electrode of a varactor BD1, an anode of the varactor BD1, one end of a capacitor C6, and the other end of the primary coil of the transformer T4 are respectively connected with +6V, the other end of the capacitor C6 is connected with ground, one end of a secondary coil of a transformer T4 is respectively connected with one end of a capacitor C8 and an anode of a diode D5, a middle tap of the transformer T4 is respectively connected with the other end of a capacitor C7 and one end of an inductor L6, and the other end of a secondary coil of the transformer T, The cathode of the diode D6 and the cathode of the diode D5 are respectively connected to one end of the capacitor C9 and one end of the resistor R8, the other end of the capacitor C9 is respectively connected to the other end of the inductor L6 and one end of the capacitor C10, the other end of the capacitor C10 is respectively connected to the anode of the diode D6 and the other end of the resistor R8, and the other end of the inductor L6 is used as an output signal of the frequency discrimination unit.

4. The substation radiation detection device according to claim 1, wherein the modulation unit comprises a capacitor C2 and a resistor R10, one end of the capacitor C2 is connected to the output end of the operational amplifier AR1, the other end of the capacitor C2 is connected to one end of the resistor R5, one end of the ground resistor R6, and the base of the transistor Q1, the emitter of the transistor Q1 is connected to one end of the ground resistor R7 and one end of the ground capacitor C3, the collector of the transistor Q1 is connected to the anode of the diode D3, the cathode of the diode D4, one end of the capacitor C16, the other end of the primary winding of the transformer T2, the other end of the resistor R5, the cathode of the diode D3, the anode of the diode D4, the other end of the capacitor C16, one end of the primary winding of the transformer T2 is connected to the power supply +5V, the other end of the secondary winding of the transformer T2 is connected to the ground, and one end of, One end of a primary coil of a transformer T3, one end of a resistor R10 is connected with the other end of an inductor L6, the other end of a resistor R10 is respectively connected with one end of a grounded capacitor C11 and a pin 2 of a photocoupler U1, a pin 1 of a photocoupler U1 is connected with +1V of a power supply, a pin 4 of a photocoupler U1 is connected with-5V of the power supply, a pin 3 of a photocoupler U1 is respectively connected with the lower end of a crystal oscillator Y1 and the negative electrode of a varactor BD1, the upper end of the crystal oscillator Y1 is respectively connected with one end of a resistor R13, one end of a resistor R11, one end of a capacitor C12, the base of a triode Q3, the collector of a triode Q3 and one end of a resistor R12 are connected with +5V of the power supply, the other end of a resistor R12, the other end of a resistor R11 and the positive electrode of an electrolytic capacitor E8, the negative electrode of the electrolytic capacitor E8 is connected with the ground, and the emitter of, One end of a resistor R14, the anode of a varactor BD1, the other end of a resistor R13, the other end of a capacitor C13, the other end of a resistor R14 and the other end of a primary coil of a transformer T1 are connected to ground, the other end of a capacitor C14 is connected to one end of a primary coil of a transformer T1, the other end of a secondary coil of a transformer T1 is connected to ground, one end of a secondary coil of a transformer T1 is connected to the base of a triode Q4, the emitter of the triode Q4 is connected to one end of a ground resistor R15 and one end of a ground capacitor C15, the collector of the triode Q4 is connected to the other end of a capacitor C4 and the other end of the primary coil of a transformer T3, and the output of the secondary coil of the transformer.

Technical Field

The invention relates to the technical field of transformer substations, in particular to a transformer substation radiation detection device.

Background

Electromagnetic radiation generated by buses, switches, transformer capacitors, reactors and the like in the transformer substation is harmful to human bodies to a certain extent, so that the radiation values around the transformer substation are observed constantly, the electromagnetic radiation is collected and analyzed, and corresponding data of the influence of the electromagnetic radiation of the transformer substation on the environment can be obtained, so that measures and suggestions for preventing and treating environmental pollution are provided according to research results, and the purpose of preventing and treating electromagnetic radiation pollution is achieved.

The existing transformer substation electromagnetic radiation detection usually adopts electromagnetic radiation detection equipment arranged on a moving vehicle to detect electromagnetic radiation, collected data are transmitted to an analysis terminal through a wireless communication module to analyze the electromagnetic radiation data, but in the process that the collected data are transmitted to the analysis terminal by the wireless communication module, noise signals such as electromagnetic radiation, radio interference and noise can cause interference to the wireless communication module, and particularly when the working frequency band of the wireless communication module is the same as the frequency band of the noise signals, the communication quality can be seriously influenced.

Disclosure of Invention

In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a radiation detection device for a substation, which effectively solves the problem that the communication quality is seriously affected when the working frequency band of a wireless communication module is the same as the frequency band of a noise signal.

The technical scheme for solving the problem is that the differential input unit comprises a differential input unit, a frequency discrimination unit and a modulation unit, and is characterized in that the differential input unit receives a substation radiation signal detected by a radiation detector by adopting an input matching network, the substation radiation signal is filtered by a common mode filter and then enters a differential amplifier to further inhibit a common mode signal and amplify a differential mode signal for output, the frequency discrimination unit carries out resonance frequency discrimination on the frequency of a noise signal and the frequency of a signal modulated by a transformer T3 by a frequency discriminator, the output voltage is zero when the frequency is the same, otherwise, a positive or negative voltage is output, the modulation unit carries out amplitude limiting and harmonic frequency amplification on the received output signal of the differential input unit to be used as a modulation signal and adds the modulation signal to one end of a primary coil of the transformer T3, when the output voltage of the received output signal of the frequency discrimination unit is zero, a photoelectric coupler U1 is conducted, 5V, the oscillation frequency of the oscillator is changed and then the signal is used as a carrier signal to be applied to the other end of the primary coil of the transformer T3, and the modulated signal is transmitted to the analysis terminal through the transmitter after being modulated by the transformer T3.

The invention has the beneficial effects that: an input matching network is adopted to receive a substation radiation signal detected by a radiation detector, the substation radiation signal is filtered by a common mode filter, enters a differential amplifier to further inhibit the common mode signal and is output after amplifying a differential mode signal, the frequency discriminator is used for carrying out resonance frequency discrimination on the frequency of a noise signal and the frequency of the signal modulated by a transformer T3, the output voltage is zero when the frequencies are the same, otherwise, positive or negative voltage is output, the function of discriminating whether the frequency of the noise signal and the frequency of the signal modulated by a transformer T3 are the same is realized, the received differential input unit output signal is subjected to amplitude limiting and harmonic frequency amplification and is used as a modulation signal to be applied to one end of a primary coil of the transformer T3, when the received frequency discrimination unit output signal is zero, a photoelectric coupler U1 is conducted, 5V is applied to an oscillator taking a triode Q3 as a core, the oscillation frequency of the oscillator is changed and then is used as a carrier signal, the transformer T3 is modulated and then transmitted to the analysis terminal through the transmitter, so that the signal frequency and the noise signal frequency are adjusted when the transformer T3 is modulated, and the problem that the communication quality is seriously influenced when the working frequency band of the wireless communication module is the same as the frequency band of the noise signal is solved.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

In a first embodiment, a substation radiation detection device includes a differential input unit, a frequency discrimination unit, and a modulation unit, where the differential input unit receives a substation radiation signal detected by a radiation detector through an input matching network, the substation radiation signal is filtered by a common mode filter and then enters a differential amplifier to further suppress a common mode signal and amplify a differential mode signal for output, so as to improve the accuracy of the received signal, the frequency discrimination unit performs resonance frequency discrimination on the frequency of a noise signal and the frequency of a signal modulated by a transformer T3 through a frequency discriminator, when the frequencies are the same, the output voltage is zero, otherwise, a positive or negative voltage is output, specifically, the noise signal is applied to a base of a triode Q2, a collector of the triode Q2 is connected to a resonance circuit of the signal modulated by the transformer T3, specifically, the transformer T4 primary coil is composed of a capacitor C5, a varactor BD1, and a transformer T4 in series, and when the, the voltages rectified by the diodes D5 and D6 are the same, the right end of the inductor L6 has no voltage difference, the output voltage is zero, when the frequency of the noise signal is higher than the signal frequency modulated by the transformer T3, a positive voltage (a positive voltage larger than zero) is output, when the frequency of the noise signal is lower than the signal frequency modulated by the transformer T3, a negative voltage (a negative voltage smaller than zero) is output, the function of distinguishing whether the frequency of the noise signal is the same as the signal frequency modulated by the transformer T3 or not is realized, the modulation unit limits the amplitude of the received output signal of the differential input unit, amplifies the amplitude of the received output signal of the differential input unit by the modulation unit, and adds the amplified output signal as a modulation signal to one end of a primary coil of the transformer T3, when the output voltage of the received output signal of the frequency discrimination unit is zero, the photoelectric coupler U1 is conducted, 5V is added to an oscillator taking the triode, the transformer T3 is modulated and then transmitted to the analysis terminal through the transmitter, so that the signal frequency and the noise signal frequency are adjusted when the transformer T3 is modulated, and the problem that the communication quality is seriously influenced when the working frequency band of the wireless communication module is the same as the frequency band of the noise signal is solved.

In the second embodiment, on the basis of the first embodiment, the differential input unit receives the substation radiation signal detected by the radiation detector (for example, the substation radiation signal may be detected by using an input matching network composed of an inductor L1, an electrolytic capacitor E1, and an electrolytic capacitor E2) to filter input interference and impedance matching, and after filtering the common-mode signal by using a common-mode filter composed of an electrolytic capacitor E2, inductors L2 and L3, and a resistor R4, the common-mode signal enters an operational amplifier AR1, a resistor R1, a resistor R4, a resistor R2, and a differential amplifier composed of a capacitor C1 to further suppress the common-mode signal and amplify the differential-mode signal for output, wherein the capacitor C1 is a differential capacitor, so as to improve the accuracy of the received signal, and the differential input matching unit includes an electrolytic capacitor E1, an electrolytic capacitor E2, an inductor L1, an inductor L3, and an anode of the electrolytic capacitor E1 and an upper end of the inductor L1 are connected to an anode of the substation radiation signal detected by the radiation detector, the lower end of an inductor L1, the negative electrode of an electrolytic capacitor E2 and the left end of an inductor L3 are connected with the negative electrode of a substation radiation signal detected by a radiation detector, the negative electrode of the electrolytic capacitor E1 is respectively connected with the positive electrode of an electrolytic capacitor E2 and the left end of an inductor L2, the right end of an inductor L2 is respectively connected with one end of a resistor R3 and one end of a resistor R1, the right end of an inductor L3 is respectively connected with the other end of a resistor R3 and one end of a resistor R2, the other end of the resistor R1 is respectively connected with one end of a capacitor C1, one end of a resistor R4 and the inverting input end of an operational amplifier AR1, the other end of the resistor R2 is respectively connected with the other end of a capacitor C2 and the non-inverting input end of an operational amplifier AR1, the output end of the operational amplifier AR1 is respectively connected with the other end of a resistor R4, the positive electrode of a diode D1 and the negative electrode of a diode, the output of the operational amplifier AR1 is the differential input cell output signal.

In a third embodiment, on the basis of the first embodiment, the frequency discriminator of the frequency discriminator performs resonant frequency discrimination on the frequency of the noise signal and the frequency of the signal modulated by the transformer T3, when the frequency is the same, the output voltage is zero, otherwise, a positive or negative voltage is output, specifically, the noise signal (which can be measured by a noise tester) is applied to the base of the transistor Q2, the collector of the transistor Q2 is connected to a resonant circuit of the signal modulated by the transformer T3, specifically, the resonant circuit is composed of a capacitor C5, a varactor diode BD1 and a primary coil of the transformer T4, when the two signals are in resonance, that is, when the two signals have the same frequency, the voltages rectified by the diodes D5 and D6 are the same, the right end of the inductor L6 has no voltage difference, the output voltage is zero, when the frequency of the noise signal is higher than the frequency of the signal modulated by the transformer T3, the positive voltage (positive voltage greater than zero) is output, the circuit outputs negative voltage (negative voltage less than zero), realizes the function of distinguishing whether the frequency of a noise signal and the frequency of a signal modulated by a transformer T3 are the same or not, and comprises a triode Q2, wherein the base electrode of the triode Q2 is connected with the noise signal, the emitter electrode of the triode Q2 is connected with-5V of a power supply, the collector electrode of the triode Q2 is respectively connected with one end of a capacitor C5, one end of a capacitor C7 and one end of a primary coil of a transformer T4, the other end of the capacitor C5 is connected with the negative electrode of a varactor BD1, the positive electrode of the varactor BD1, one end of the capacitor C6 and the other end of the primary coil of the transformer T4 are respectively connected with +6V of the power supply, the other end of the capacitor C6 is connected with ground, one end of a secondary coil of the transformer T4 is respectively connected with one end of the capacitor C8 and the positive electrode of a diode D5, a middle tap of the transformer T4 is, The cathode of the diode D6 and the cathode of the diode D5 are respectively connected to one end of the capacitor C9 and one end of the resistor R8, the other end of the capacitor C9 is respectively connected to the other end of the inductor L6 and one end of the capacitor C10, the other end of the capacitor C10 is respectively connected to the anode of the diode D6 and the other end of the resistor R8, and the other end of the inductor L6 is used as an output signal of the frequency discrimination unit.

In a fourth embodiment, based on the first embodiment, after the differential input unit output signal received by the modulation unit is subjected to amplitude limiting by diodes D1 and D2 connected in series, the differential input unit output signal enters a transistor Q1, a transformer T2, a resistor R5-a resistor R7, a capacitor C2, a capacitor C3, a capacitor C16, a harmonic amplification circuit composed of diodes D2 and D4, and is subjected to harmonic amplification to be applied to one end of a primary coil of a transformer T3 as a modulation signal, a specific primary coil of the transformer T2 and a specific capacitor C16 form a harmonic network, the frequency is the operating frequency of the electromagnetic radiation frequency selector, the base bias resistors of the resistor R5 and the R6-bit transistor Q1, the diodes D3 and D4 perform amplitude limiting function to realize the frequency-selective amplification of the differential input unit output signal, when the received amplitude-limiting frequency discrimination unit output signal is zero, the input terminal of the coupler U1 generates a voltage difference, and the photocoupler U1 is turned on, an oscillator consisting of a triode Q3, a resistor R13-R15, a capacitor C12-a capacitor C15, a crystal oscillator Y1, a varactor BD1 and a transformer T1 is added with-5V, the oscillator changes the oscillation frequency of the oscillator and then is used as a carrier signal to be added to the other end of a primary coil of the transformer T3, the transformer T3 modulates the signal and then transmits the modulated signal to an analysis terminal through a transmitter, the adjustment is realized when the signal frequency modulated by the transformer T3 is the same as the noise signal frequency, the problem that the communication quality is seriously influenced when the working frequency band of a wireless communication module is the same as the frequency band of the noise signal is solved, the oscillator comprises a capacitor C2 and a resistor R10, one end of the capacitor C2 is connected with the output end of an operational amplifier AR1, the other end of the capacitor C2 is respectively connected with one end of the resistor R5, one end of a ground resistor R6 and the base of a triode Q1, the emitter of a triode Q1, the collector of the triode Q1 is respectively connected with the anode of the diode D3, the cathode of the diode D4, one end of the capacitor C16, the other end of the primary coil of the transformer T2, the other end of the resistor R5, the cathode of the diode D3, the anode of the diode D4, the other end of the capacitor C16, one end of the primary coil of the transformer T2 is connected with +5V of the power supply, the other end of the secondary coil of the transformer T2 is connected with the ground, one end of the secondary coil of the transformer T2 is connected with one end of the capacitor C4 and one end of the primary coil of the transformer T3, one end of the resistor R10 is connected with the other end of the inductor L6, the other end of the resistor R10 is respectively connected with one end of the ground capacitor C11 and the pin 2 of the photocoupler U1, the pin 1 of the photocoupler U1 is connected with the power supply +1V, the pin 4 of the photocoupler U1 is connected with the power supply, the upper end of the crystal oscillator Y1 is connected to one end of a resistor R13, one end of a resistor R11, one end of a capacitor C12 and the base of a triode Q3, the collector of the triode Q3 and one end of a resistor R12 are connected to +5V, the other end of the resistor R12, the other end of the resistor R11 and the anode of an electrolytic capacitor E8, the cathode of the electrolytic capacitor E8 is connected to ground, the emitter of the triode Q3 is connected to one end of a capacitor C12, one end of a capacitor C13, one end of a capacitor C14, one end of a resistor R14, the anode of a varactor BD 14, the other end of a resistor R14, the other end of a capacitor C14, the other end of a primary coil of a resistor R14 and the other end of a primary coil of a transformer T14, the other end of a secondary coil of the transformer T14 is connected to ground, one end of a secondary coil of the transformer T14 is connected to the base of the triode Q14 and one end of a resistor R14 are connected to, One end of a grounding capacitor C15, a collector of a triode Q4 is respectively connected with the other end of the capacitor C4 and the other end of a primary coil of a transformer T3, and a secondary coil of the transformer T3, which is modulated by a transformer T3, is output and then is transmitted to an analysis terminal through a transmitter.

When the invention is used, the differential input unit receives a substation radiation signal detected by a radiation detector by adopting an input matching network consisting of an inductor L1, an electrolytic capacitor E1 and an electrolytic capacitor E2, so as to filter input interference and impedance matching, common-mode signals are filtered by a common-mode filter and then enter a differential amplifier consisting of an operational amplifier AR1, a resistor R1, a resistor R4, a resistor R2 and a capacitor C1 to further inhibit the common-mode signals and amplify and output differential-mode signals, so that the precision of the received signals is improved, the frequency discrimination unit adds the received noise signals to the base of a triode Q2, the collector of the triode Q2 is connected with a resonance circuit of the signals modulated by a transformer T3, and particularly consists of a capacitor C5, a varactor diode BD1 and a primary coil of a transformer T4 which are connected in series, when the two signals are in resonance, namely, the voltages rectified by diodes D5 and D6 are the same when the two signals are in, the right end of the inductor L6 has no voltage difference, the output voltage is zero, when the frequency of the noise signal is higher than the signal frequency modulated by the transformer T3, a positive voltage (larger than zero positive voltage) is output, when the frequency of the noise signal is lower than the signal frequency modulated by the transformer T3, a negative voltage (smaller than zero negative voltage) is output, whether the frequency of the noise signal is the same as the signal frequency modulated by the transformer T3 or not is realized, the output signal of the differential input unit received by the modulation unit is subjected to amplitude limiting through diodes D1 and D2 which are connected in series, the output signal enters a harmonic frequency amplification circuit for harmonic frequency amplification and is applied to one end of a primary coil of the transformer T3 as a modulation signal after being subjected to frequency selection amplitude limiting amplification, when the output voltage of the received frequency discrimination unit is zero, the input end of a photoelectric coupler U1 generates a voltage difference, the photoelectric coupler U1 is conducted, and a voltage of, the oscillation frequency of the oscillator is changed and then is used as a carrier signal to be added to the other end of the primary coil of the transformer T3, the transformer T3 is modulated and then is transmitted to the analysis terminal through the transmitter, the signal frequency and the noise signal frequency after the modulation of the transformer T3 are the same to be adjusted, and the problem that the communication quality is seriously influenced when the working frequency band of the wireless communication module is the same as the frequency band of the noise signal is solved.