WO2015085955A1 - 一种多路局部放电信号并行连接方法及装置 - Google Patents

一种多路局部放电信号并行连接方法及装置 Download PDF

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WO2015085955A1
WO2015085955A1 PCT/CN2014/093788 CN2014093788W WO2015085955A1 WO 2015085955 A1 WO2015085955 A1 WO 2015085955A1 CN 2014093788 W CN2014093788 W CN 2014093788W WO 2015085955 A1 WO2015085955 A1 WO 2015085955A1
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signal
partial discharge
signals
sub
self
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PCT/CN2014/093788
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English (en)
French (fr)
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胡岳
江秀臣
盛戈皞
曹灵钰
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上海交通大学
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Priority to US14/654,571 priority Critical patent/US9979423B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0483—Transmitters with multiple parallel paths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion

Definitions

  • the invention belongs to the technical field of signal control, and in particular relates to a parallel connection method and device for multiple partial discharge signals.
  • the multi-channel high-frequency pulse signals are connected in parallel on one transmission bus for transmission, and at any interface that is incorporated into the transmission bus, the transmission of the integrated signal to the transmission bus needs to be realized, and no Loss of transmission of other signals on the transmission bus to the transmission line.
  • Option A Circulator. As shown in FIG. 1, the signal in the circulator can only be along the first port 1 ⁇ the second port 2, the second port 2 ⁇ the third port 3, the third port 3 ⁇ the fourth port 4, the fourth port 4 ⁇ The direction of a port 1 is transmitted, so that the circulator can realize one-way transmission of signals.
  • scheme A The disadvantage of scheme A is that the occlusion of the reverse signal by the circulator is achieved by absorbing the signal energy, and for the non-selected transmission signal in the multiplexed signal, that is, other UHF signals transmitted by the parallel connection branch in the signal bus.
  • the signal isolation circuit in the unidirectional transmission circuit based on the circulator When it passes through the signal isolation circuit in the unidirectional transmission circuit based on the circulator, a large amount of signal energy is attenuated, resulting in signal loss, and the signal energy is attenuated by 50%.
  • Option B Switching circuit.
  • the switch circuit can achieve isolation of multiple partial discharge signals to a certain extent. When the switch is closed, the signal can pass and is bidirectional. When the switch is off, the signal cannot pass.
  • scheme B The disadvantage of scheme B is that the general switch circuit cannot realize the self-trigger closing and off of the signal to control the switch, so the self-trigger unidirectional transmission cannot be realized.
  • the object of the present invention is to provide a multi-channel partial discharge signal parallel connection method and device, thereby realizing self-trigger one-way transmission and isolation of signals, thereby realizing multi-channel partial discharge signals (including partial discharge).
  • the method for parallel connection of multiple partial discharge signals according to the present invention includes the following steps:
  • Step 1.1 receiving sensing signals input by a plurality of sensors, wherein the sensing signals include a partial discharge UHF signal, an ultrasonic signal, and a high frequency current signal;
  • Step 1.2 Perform preprocessing on each of the sensing signals, including amplification and filtering, to obtain an amplified and filtered signal;
  • Step 1.3 The amplified and filtered signal is isolated by a self-trigger switch, so that the signal can be self-triggered and transmitted in one direction;
  • Step 1.4 output the signal after each path is isolated
  • the isolating and filtering the amplified and filtered signal includes the following steps:
  • Step 1.3.1 dividing the amplified and filtered signal into a first sub-signal and a second sub-signal;
  • Step 1.3.2A If the first sub-signal is a partial discharge UHF signal, the first sub-signal is subjected to a delay time after a set delay time, and the first sub-signal after the delay transmission is divided into multiple Each frequency band signal group, after each group of signals is delayed, combined and combined by the signal synthesizer and then amplified; then outputted by the self-trigger switch, or then outputted by the self-trigger switch, and then the signal output by the self-trigger switch is detected. ;
  • the first sub-signal is a high-frequency current signal or an ultrasonic signal
  • the first sub-signal can be directly output through the self-trigger switch with or without delay
  • Step 1.3.2B comparing the second sub-signal with a reference level to implement automatic detection of the signal, and converting the second sub-signal into a driving signal of the switch;
  • Step 1.3.3 Broaden the drive signal of the switch to a set time width to drive the self-trigger switch on and off.
  • the delayed transmission of the partial discharge UHF signal is implemented by a surface acoustic wave delay line group, and the delayed transmission of the high frequency current signal and the ultrasonic signal is implemented by an emitter follower circuit.
  • the signal frequency band of the partial discharge UHF signal delayed transmission is 400 MHz to 500 MHz, 700 MHz to 800 MHz, and 1100 MHz to 1200 MHz.
  • the reference level is an adjustable reference level.
  • the driving signal of the switch is a square wave signal with a constant voltage and a pulse width consistent with the received sensing signal.
  • a multi-channel partial discharge signal parallel connection device includes the following devices:
  • a signal input interface configured to receive sensing signals input by the plurality of sensors, wherein the sensing signals include a partial discharge UHF signal, an ultrasonic signal, and a high frequency current signal;
  • a signal amplifying circuit configured to perform pre-processing on each of the sensing signals, including amplification and filtering, to obtain an amplified and filtered signal;
  • a signal isolation circuit configured to perform isolation processing on the amplified and filtered signal, so that the signal can be self-triggered and unidirectionally transmitted;
  • a signal output interface for outputting signals after isolation processing.
  • the signal isolation circuit comprises:
  • a signal separation circuit configured to divide the amplified and filtered signal into a first sub-signal and a second sub-signal
  • a partial discharge UHF signal delay circuit configured to: when the first sub-signal is a partial discharge UHF signal, delay the transmission of the first sub-signal by a set delay time;
  • the first sub-signal is a high-frequency current signal or an ultrasonic signal
  • the first sub-signal is directly output through the self-triggering switch after being delayed by the emitter-level following circuit or without delay;
  • a signal synthesizing circuit configured to combine and amplify the plurality of frequency band signals divided by the first sub-signal delayed by the partial discharge UHF signal delay circuit, and then transmit the signals to the self-trigger switch output;
  • a reference voltage circuit for providing a reference level
  • a high speed comparison circuit for comparing the second sub-signal with the reference level to implement automatic detection of the signal, and converting the second sub-signal into a driving signal of the switch;
  • a monostable trigger circuit for widening the driving signal of the switch to a set time width to drive the opening and closing of the self-triggering switch.
  • the delayed transmission of the partial discharge UHF signal is implemented by a surface acoustic wave delay line group.
  • the signal frequency band of the partial discharge UHF signal delayed transmission is 400 MHz to 500 MHz, 700 MHz to 800 MHz, and 1100 MHz to 1200 MHz.
  • the reference level is an adjustable reference level.
  • the driving signal of the switch is a square wave signal with a constant voltage and a pulse width consistent with the received sensing signal.
  • the present invention has the following beneficial effects:
  • the invention receives the signals input by the plurality of sensors, and performs amplification processing on each of the signals to obtain an amplified signal, and then detects the special high-frequency signal therein, and then isolates the amplified signal to enable the signal to be Self-triggered one-way transmission, and finally the signals that have been isolated and processed are completely output.
  • the invention amplifies and isolates the multi-channel signals, so that the signals can self-trigger one-way transmission and isolation, thereby realizing the interference-free parallel connection of the multi-channel partial discharge UHF signals, further avoiding the signal loss during the transmission signal process. .
  • one data acquisition device can simultaneously monitor a plurality of signals, thereby realizing the same data acquisition and acquisition.
  • the data collection is carried out, and synchronous online monitoring of multiple power devices is realized at a low cost, and the insulation defects of the power equipment are found in time to improve the operation safety of the equipment.
  • FIG. 1 is a schematic diagram of signal transmission of a circulator in the prior art
  • FIG. 2 is a flowchart of a method for parallel connection of multiple partial discharge signals according to an embodiment of the present invention
  • FIG. 3 is a flowchart of an isolation signal isolation process according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a multi-channel partial discharge signal parallel connection device according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a signal isolation circuit according to an embodiment of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 2 is a flowchart of a method for parallel connection of multiple partial discharge signals according to an embodiment of the present invention.
  • the method includes the following steps:
  • Step S201 Receive signals of a plurality of sensor inputs.
  • the sensor comprises a partial discharge UHF sensor, an ultrasonic sensor, and a high frequency current sensor respectively, respectively generating an ultra high frequency sensing signal, an ultrasonic signal, and a high frequency current signal, that is, the step may specifically be: receiving a plurality of local UHF sensor inputs.
  • Step S202 Perform preprocessing on each signal, including amplification and filtering, to obtain an amplified and filtered signal.
  • preprocessing on each signal, including amplification and filtering, to obtain an amplified and filtered signal.
  • Step S203 Performing isolation processing on the amplified and filtered signal.
  • FIG. 3 is a flowchart of an isolation signal isolation process according to an embodiment of the present invention, and performing the isolation processing on the amplified and filtered signal includes the following steps:
  • Step S301 Dividing the amplified signal into a first sub-signal and a second sub-signal.
  • Step S302 If the first sub-signal is a partial discharge UHF signal, the first sub-signal is subjected to delay transmission after a set delay time, and the first sub-signal after the delay transmission is divided into multiple frequency bands.
  • the signal group, after each group of signals is delayed, combined and combined by the signal synthesizer and then amplified; then outputted by the self-trigger switch, or then outputted by the self-trigger switch, and then the signal output by the self-trigger switch is detected;
  • the delay time is greater than or equal to the sum of the self-trigger switch control circuit and the self-trigger switch operation time, and the delay time of the partial discharge UHF signal is realized by the surface acoustic wave delay line group, and the partial discharge of the delayed transmission is extremely high.
  • the frequency signal band is 400MHz to 500MHz, 700MHz to 800MHz, 1100MHz to 1200MHz, and the delay time is 100ns.
  • the surface acoustic wave delay line group can filter the signal because of the frequency selection characteristic.
  • Step S303 comparing the second sub-signal with the reference level to realize automatic detection of the signal, and converting the second sub-signal into a driving signal of the switch, for example, the driving signal of the switch may be a square wave.
  • the reference level is an adjustable reference level that has been set, and can be adjusted according to a specific situation when the setting is performed, and the second sub-signal is compared with the reference level to realize automatic detection of the signal, performing level conversion, and transforming.
  • a drive signal for a switch whose voltage is constant and whose pulse width is consistent with the input signal.
  • Step S304 widen the driving signal of the switch to a set time width to drive the opening and closing of the self-triggering switch.
  • Step S204 Output the signals after the isolation processing of each channel.
  • the partial discharge UHF signal passes a certain time delay, and the transmission reaches the self-trigger switch just after the second sub-signal starts the switch, thereby ensuring that the partial discharge UHF signal completely passes the self-trigger switch and realizes the signal.
  • the self-trigger unidirectional transmission realizes the interference-free parallel connection of the multi-channel partial discharge UHF signals, thereby avoiding the loss during signal transmission.
  • the multi-channel partial discharge signal parallel connection method receives a signal input by a plurality of sensors, and performs pre-processing on each of the signals to obtain an amplified signal, and The amplified signal is isolated, so that the signal can be self-triggered for one-way transmission, and finally the signals that have been isolated by each channel are completely output.
  • the invention can perform self-trigger unidirectional transmission and isolation by amplifying and isolating the multi-channel partial discharge signals, thereby realizing the interference-free parallel connection of the multi-channel partial discharge UHF signals, further The loss of the signal during the transmission of the signal is avoided.
  • the multi-channel partial discharge signal parallel connection method because the parallel discharge of the partial discharge UHF detection signal is transmitted to the signal bus, a data acquisition device can simultaneously monitor a plurality of signals, thereby realizing the same set of data acquisition devices Perform data collection to achieve simultaneous online monitoring of multiple power devices at a lower cost, and When it finds insulation defects of power equipment, it improves the safety of equipment operation.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the embodiment of the present invention further provides a multi-channel partial discharge signal parallel connection device, as shown in FIG. 4, which is a schematic diagram of a multi-channel partial discharge signal parallel connection device according to an embodiment of the present invention. .
  • the multi-channel partial discharge signal parallel connection device comprises the following sub-devices:
  • the signal input interface 401 is configured to receive signals input by multiple sensors.
  • the sensor comprises a partial discharge UHF sensor, an ultrasonic sensor, and a high frequency current sensor, respectively receiving a partial discharge UHF sensing signal, an ultrasonic signal, and a high frequency current signal, that is, the signal input interface 401 is specifically configured to receive a plurality of partial discharges.
  • the high-frequency sensor inputs a partial discharge UHF sensing signal, a plurality of ultrasonic sensor input ultrasonic sensing signals, and a plurality of high-frequency current sensor input high-frequency current sensing signals.
  • the signal input interface 401 preferably includes a radio frequency signal interface coupled to the partial discharge UHF sensor with a frequency range of greater than 300 MHz to less than 1.5 GHz.
  • the signal amplifying circuit 402 is configured to perform pre-processing on each of the signals, including amplification, filtering, and the like, to obtain an amplified and filtered signal.
  • the signal amplifying circuit 402 is preferably a low noise amplifier having an amplification gain of 20 dB or more and a frequency response range of more than 300 MHz to less than 3 GHz.
  • the signal isolation circuit 403 is configured to perform isolation processing on the amplified and filtered signal, so that the signal can be self-triggered and transmitted in one direction. Wherein, for the partial discharge UHF signal, the signal can be detected by the detector after passing through the self-trigger switch in the signal isolation circuit 403.
  • FIG. 5 is a schematic diagram of a signal isolation circuit according to an embodiment of the present invention.
  • the signal isolation circuit 403 includes:
  • a signal separation circuit 501 configured to divide the amplified signal into a first sub-signal and a second sub-signal
  • the partial discharge UHF signal delay circuit 502 is configured to: when the first sub-signal is a partial discharge UHF signal, delay the transmission of the first sub-signal through a set delay time.
  • the shot following circuit 508 is configured to delay the first sub-signal and output the self-trigger switch when the first sub-signal is a high-frequency current signal or an ultrasonic signal.
  • the emitter follower circuit 508 can be omitted, that is, the high frequency current signal and the ultrasonic signal are directly output through the self-trigger switch without delay.
  • the partial discharge UHF signal delay circuit 502 is a surface acoustic wave delay line group, and the partial discharge UHF signal frequency band of the delayed transmission is 400 MHz to 500 MHz, 700 MHz to 800 MHz, 1100 MHz to 1200 MHz, and the delay time is 100 ns.
  • the partial discharge UHF signal delay circuit 502 has a delay time greater than or equal to the self-trigger switch control circuit and The sum of the self-triggering switch action times.
  • a signal synthesizing circuit 507 configured to combine and combine the plurality of frequency band signals divided by the first sub-signal delayed by the partial discharge UHF signal delay circuit, and then transmit the signals to the output of the self-trigger switch 506;
  • the signal output from the trigger switch 506 is subjected to a detection process.
  • the reference voltage circuit 503 is for providing a reference level.
  • the reference level is a set adjustable reference level, which is provided by the reference voltage circuit 503.
  • the reference level can be adjusted according to a specific situation to adjust to generate a required reference level. until.
  • the high speed comparison circuit 504 is configured to compare the second sub-signal with a reference level provided by the reference voltage circuit 503 to implement automatic detection of the signal, and convert the second sub-signal into a drive signal of the switch, such as a square wave signal.
  • the second sub-signal is compared with the reference level to realize automatic detection of the signal, and level-converted, and converted into a driving signal of a switch whose voltage is constant and whose pulse width is consistent with the input signal.
  • the monostable trigger circuit 505 is configured to widen the driving signal of the switch to a set time width to drive the opening and closing of the self-triggering switch 506.
  • the monostable trigger circuit 505 is a monostable trigger circuit based on the 555 timer, and the transient steady-state time is less than 1 us.
  • the action time of the self-trigger switch 506 is less than 10 ns.
  • the signal output interface 404 is configured to output the signals after the isolation processing.
  • Signal output interface 404 may preferably correspond to a radio frequency signal interface having a frequency response ranging from greater than 300 MHz to less than 1.5 GHz.
  • the partial discharge UHF signal passes through the partial discharge UHF signal delay circuit 502 for a certain time delay, and just after the second sub-signal starts the switch, the transmission reaches the self-trigger switch, thereby ensuring the UHF signal integrity.
  • the self-triggering switch the self-trigger unidirectional transmission of the signal is realized, and the interference-free parallel connection of the multi-channel partial discharge UHF signal is realized, thereby avoiding the loss during signal transmission.
  • the multi-channel signal parallel connection device receives the signals input by the plurality of sensors, performs pre-processing on each of the signals, and obtains an amplified signal, and the amplification is performed.
  • the signal is isolated, so that the signal can self-trigger one-way transmission, and finally the signal after isolation is completely output.
  • the invention can realize the self-trigger unidirectional transmission and isolation by amplifying and isolating the multi-channel signals, thereby realizing the interference-free parallel connection of the multi-channel partial discharge signals, further avoiding the transmission signal process. The loss of the signal.
  • the multi-channel partial discharge signal parallel connection device transmits the partial discharge detection signals in parallel Into the signal bus, a data acquisition device can simultaneously monitor multiple signals, thereby realizing data acquisition through the same set of data acquisition devices, realizing synchronous online monitoring of multiple power devices at a lower cost, and timely discovering power devices. Insulation defects improve the safety of equipment operation.

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Abstract

一种多路局部放电信号并行连接方法，包括：接收多个传感器输入的信号（S201）；对每个信号进行预处理，得到放大滤波后的信号（S202）；将放大滤波后的信号进行隔离处理（S203），使信号能够自触发单向传输，其中特高频局部放电信号的延时传输采用声表面波延迟线组实现；将各路经过隔离处理后的信号输出（S204）。该方法通过对多路信号进行放大隔离处理，使得信号能够自触发单向传输及隔离，进而实现多路局部放电信号的无干扰并行连接，进一步避免了传输信号过程中信号的损耗。同时，由于并行连接的局部放电检测信号都传入到信号总线，一个数据采集装置同时监测多个信号，从而实现了通过同一套数据采集装置进行数据采集，降低了成本。还提供一种多路局部放电信号并行连接装置。

Description

一种多路局部放电信号并行连接方法及装置 技术领域
本发明属于信号控制技术领域，特别是涉及一种多路局部放电信号并行连接方法及装置。
背景技术
在局部放电信号检测中，多路特高频脉冲信号并行连接在一路传输总线上进行传输，在任意一路并入传输总线的接口处，需要实现该路并入信号向传输总线的传输，同时无损耗地隔断传输总线上其他信号向该路传输线的传输。
在现有技术中，通常采用如下两种方案(方案A、方案B)实现信号隔离及自触发开关：
方案A：环行器。如图1所示，在环行器中信号只可以沿第一端口1→第二端口2，第二端口2→第三端口3，第三端口3→第四端口4，第四端口4→第一端口1的方向进行传输，从而环行器能够实现信号的单向传输。
方案A的缺点是：环行器对反向信号的隔断是通过吸收信号能量实现的，对于多路传输信号中的非选择传输信号，即信号总线中并行连接支路传输过来的其他特高频信号，其在通过基于环行器的单向传输电路中的信号隔离电路时会产生大量的信号能量衰减，造成信号损耗，信号能量衰减了50％。
方案B：开关电路。开关电路可以在一定程度上实现多路局部放电信号的隔离，其在开关闭合时信号可以通过，且是双向的，在开关断开时，则信号不能通过。
方案B的缺点是：一般的开关电路不能实现信号的自触发闭合和关断来控制开关，所以不能实现自触发单向传输。
发明内容
针对现有技术中的缺陷，本发明的目的是提供一种多路局部放电信号并行连接方法及装置，从而实现信号的自触发单向传输及隔离，进而实现多路局部放电信号(含局部放电特高频信号、超声信号、高频电流信号)的无干扰并行连接，避免信号传输过程中的损耗。
根据本发明提供的多路局部放电信号并行连接方法，包括如下步骤：
步骤1.1：接收多个传感器输入的传感信号，其中，所述传感信号包括局部放电特高频信号、超声信号、高频电流信号；
步骤1.2：对每个所述传感信号进行预处理，包括放大和滤波，得到放大滤波后的信号；
步骤1.3：将所述放大滤波后的信号通过自触发开关进行隔离处理，使信号能够自触发单向传输；
步骤1.4：将各路经过隔离处理后的信号输出；
其中，将所述放大滤波后的信号进行隔离处理包括如下步骤：
步骤1.3.1：将所述放大滤波后的信号分为第一子信号与第二子信号；
步骤1.3.2A：若所述第一子信号是局部放电特高频信号，则将第一子信号经过设定的延时时间来进行延时传输，延时传输后的第一子信号分成多个频段信号组，各组信号经过延时后，通过信号合成器进行组合合并后再放大；然后通过自触发开关输出、或者然后通过自触发开关输出后再将自触发开关输出的信号进行检波处理；
若所述第一子信号是高频电流信号或者超声信号，则将第一子信号可经延时或者不经延时直接通过自触发开关输出；
步骤1.3.2B：所述第二子信号与参考电平进行比较实现信号的自动检测，并将所述第二子信号转变为开关的驱动信号；
步骤1.3.3：将所述开关的驱动信号展宽到设定的时间宽度以驱动自触发开关的开启与关闭。
优选地，所述局部放电特高频信号的延时传输采用声表面波延迟线组实现，高频电流信号及超声信号的延时传输通过射级跟随电路实现。
优选地，局部放电特高频信号延时传输的信号频段为400MHz～500MHz，700MHz～800MHz，1100MHz～1200MHz。
优选地，所述参考电平为可调参考电平。
优选地，所述开关的驱动信号为电压恒定、脉宽与接收的传感信号一致的方波信号。
根据本发明提供的多路局部放电信号并行连接装置，包括如下装置：
信号输入接口，用于接收多个传感器输入的传感信号，其中，所述传感信号包括局部放电特高频信号、超声信号、高频电流信号；
信号放大电路，用于对每个所述传感信号进行预处理，包括放大和滤波，得到放大滤波后的信号；
信号隔离电路，用于将所述放大滤波后的信号进行隔离处理，使信号能够自触发单向传输；
信号输出接口，用于将各路经过隔离处理后的信号输出。
其中，所述信号隔离电路包括：
信号分离电路，用于将所述放大滤波后的信号分为第一子信号与第二子信号；
局部放电特高频信号延时电路，用于当所述第一子信号为局部放电特高频信号时，将所述第一子信号经过设定的延时时间来进行延时传输；
当所述第一子信号为高频电流信号或者超声信号时，第一子信号经射级跟随电路延时后或者不经延时直接通过自触发开关输出；
信号合成电路，用于将经所述局部放电特高频信号延时电路延时传输后的第一子信号分成的多个频段信号进行组合合并后放大，进而传输给自触发开关输出；
参考电压电路，用于提供参考电平；
高速比较电路，用于将所述第二子信号与所述参考电平进行比较实现信号的自动检测，并将所述第二子信号转变为开关的驱动信号；
单稳态触发电路，用于将所述开关的驱动信号展宽到设定的时间宽度以驱动自触发开关的开启与关闭。
优选地，所述局部放电特高频信号的延时传输采用声表面波延迟线组实现。
优选地，局部放电特高频信号延时传输的信号频段为400MHz～500MHz，700MHz～800MHz，1100MHz～1200MHz。
优选地，所述参考电平为可调参考电平。
优选地，所述开关的驱动信号为电压恒定、脉宽与接收的传感信号一致的方波信号。
与现有技术相比，本发明具有如下的有益效果：
本发明通过接收多个传感器输入的信号，并对每个所述信号进行放大处理，得到放大信号，对于其中的特高频信号再进行检波，然后将所述放大信号进行隔离处理，使信号能够自触发单向传输，最后将各路经过隔离处理后的信号完整地输出。本发明通过对多路信号进行放大隔离处理，使得信号能够自触发单向传输及隔离，进而实现多路局部放电特高频信号的无干扰并行连接，进一步地避免了传输信号过程中信号的损耗。
同时，在本发明中，由于并行连接的局部放电特高频检测信号都传入到信号总线，一个数据采集装置可以同时监测多个信号，从而实现了通过同一套数据采集装 置进行数据采集，达到了以较低的成本实现多个电力设备的同步在线监测，及时发现电力设备的绝缘缺陷，提高设备运行安全的目的。
附图说明
通过阅读参照以下附图对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更明显：
图1为现有技术中环行器信号传输示意图；
图2为本发明实施例提供的一种多路局部放电信号并行连接方法的流程图；
图3为本发明实施例提供的一种将放大信号隔离处理的流程图；
图4为本发明实施例提供的一种多路局部放电信号并行连接装置的示意图；
图5为本发明实施例提供的一种信号隔离电路的示意图。
具体实施方式
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明，但不以任何形式限制本发明。应当指出的是，对本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进。这些都属于本发明的保护范围。
实施例一：
图2为本发明实施例提供的一种多路局部放电信号并行连接方法的流程图。
如图2所示，该方法包括如下步骤：
步骤S201：接收多个传感器输入的信号。
传感器包括局部放电特高频传感器、超声传感器、高频电流传感器，分别产生特高频传感信号、超声信号、高频电流信号，即本步骤可以具体为：接收多个局部特高频传感器输入的特高频传感信号、多个超声传感器输入的超声传感信号、多个高频电流传感器输入的高频电流传感信号。
步骤S202：对每个信号进行预处理，包括放大、滤波处理，得到放大滤波后的信号。其中，在局部放电特高频信号的预处理中还需进行检波这个降频处理。
步骤S203：将放大滤波后的信号进行隔离处理。
进一步地，为了避免信号传输过程中多个信号之间相互干扰，将放大滤波后的信号进行隔离处理，从而使信号能够自触发单向传输。具体隔离过程参见图3所示，图3为本发明实施例提供的一种将放大信号隔离处理的流程图，将所述放大滤波后的信号进行隔离处理包括如下步骤：
步骤S301：将放大信号分为第一子信号与第二子信号。
步骤S302：若所述第一子信号是局部放电特高频信号，则将第一子信号经过设定的延时时间来进行延时传输，延时传输后的第一子信号分成多个频段信号组，各组信号经过延时后，通过信号合成器进行组合合并后再放大；然后通过自触发开关输出、或者然后通过自触发开关输出后再将自触发开关输出的信号进行检波处理；
具体地，延时时间大于或者等于自触发开关控制电路及自触发开关动作时间之和，局部放电特高频信号的延时时间采用声表面波延迟线组实现，延时传输的局部放电特高频信号频段为400MHz～500MHz，700MHz～800MHz，1100MHz～1200MHz，延时时间100ns。声表面波延时线组，因具有选频特性，可以完成对信号的滤波。
步骤S303：第二子信号与参考电平进行比较实现信号的自动检测，并将第二子信号转变为开关的驱动信号，例如开关的驱动信号可以是方波。
具体地，参考电平是已设定的可调参考电平，设定的时候可以根据具体情况进行调节，第二子信号与参考电平进行比较实现信号的自动检测，进行电平转换，转变为电压恒定、脉宽与所述输入信号一致的开关的驱动信号。
步骤S304：将开关的驱动信号展宽到设定的时间宽度以驱动自触发开关的开启与关闭。
步骤S204：将各路经过隔离处理后的信号输出。
此时，局部放电特高频信号经过一定时间的延时，恰好在第二子信号启动开关后传输到达自触发开关，从而保证了局部放电特高频信号完整地通过自触发开关，实现了信号的自触发单向传输，进而实现多路局部放电特高频信号的无干扰并行连接，避免了信号传输过程中的损耗。
由以上技术方案可见，本发明实施例提供的该多路局部放电信号并行连接方法，通过接收多个传感器输入的信号，并对每个所述信号进行放大等预处理，得到放大信号，在将所述放大信号进行隔离处理，使信号能够自触发单向传输，最后将各路经过隔离处理后的信号完整地输出。本发明与现有技术相比，通过对多路局部放电信号进行放大隔离处理，使得信号能够自触发单向传输及隔离，进而实现多路局部放电特高频信号的无干扰并行连接，进一步地避免了传输信号过程中信号的损耗。
同时，该多路局部放电信号并行连接方法，由于并行连接的局部放电特高频检测信号都传入到信号总线，一个数据采集装置可以同时监测多个信号，从而实现了通过同一套数据采集装置进行数据采集，以较低的成本实现对多个电力设备的同步在线监测，及 时发现电力设备的绝缘缺陷，提高设备运行安全的目的。
实施例二：
在实施例一的基础上，本发明实施例还提供了一种多路局部放电信号并行连接装置，如图4所示，为本发明实施例提供的一种多路局部放电信号并行连接装置示意图。
所述多路局部放电信号并行连接装置包括如下子装置：
信号输入接口401，用于接收多个传感器输入的信号。
传感器包括局部放电特高频传感器、超声传感器、高频电流传感器，分别接收局部放电特高频传感信号、超声信号、高频电流信号，即信号输入接口401具体用于接收多个局部放电特高频传感器输入的局部放电特高频传感信号、多个超声传感器输入的超声传感信号、多个高频电流传感器输入的高频电流传感信号。
信号输入接口401优选地包括射频信号接口，连接局部放电特高频传感器，频率影响范围为大于300MHz到小于1.5GHz。
信号放大电路402，用于对每个所述信号进行预处理，包括放大、滤波等处理，得到放大滤波后的信号。信号放大电路402优选地为低噪放大器，放大增益大于等于20dB，频率响应范围为大于300MHz到小于3GHz。
信号隔离电路403，用于将所述放大滤波后的信号进行隔离处理，使信号能够自触发单向传输。其中，对于局部放电特高频信号，信号经过信号隔离电路403中自触发开关之后可以经过检波器进行检波处理。
为了避免信号传输过程中多个信号之间相互干扰，将放大滤波后的信号由信号隔离电路403来进行隔离处理。如图5所示，图5为本发明实施例提供的一种信号隔离电路的示意图，信号隔离电路403包括：
信号分离电路501，用于将放大信号分为第一子信号与第二子信号；
局部放电特高频信号延时电路502，用于当所述第一子信号为局部放电特高频信号时，将第一子信号经过设定的延时时间来进行延时传输。
射级跟随电路508，用于当所述第一子信号为高频电流信号或者超声信号时，将第一子信号延时后通过自触发开关输出。而在变化例中，射级跟随电路508可以省略，即高频电流信号及超声信号不经延时直接通过自触发开关输出。
具体地，局部放电特高频信号延时电路502为声表面波延迟线组，延时传输的局部放电特高频信号频段为400MHz～500MHz，700MHz～800MHz，1100MHz～1200MHz，延时时间100ns。局部放电特高频信号延时电路502延时时间大于或等于自触发开关控制电路及 自触发开关动作时间之和。
信号合成电路507，用于将经所述局部放电特高频信号延时电路延时传输后的第一子信号分成的多个频段信号进行组合合并后放大，进而传输给自触发开关506输出；在优选例中，将自触发开关506输出的信号再进行检波处理。
参考电压电路503，用于提供参考电平。
具体地，参考电平是已设定的可调参考电平，由参考电压电路503提供，参考电压电路503设定参考电平的时候可以根据具体情况进行调节，调节到产生需要的参考电平为止。
高速比较电路504，用于将第二子信号与参考电压电路503提供的参考电平进行比较实现信号的自动检测，并将第二子信号转变为开关的驱动信号，例如方波信号。
具体地，第二子信号与参考电平进行比较实现信号的自动检测，并进行电平转换，转变为电压恒定、脉宽与所述输入信号一致的开关的驱动信号。
单稳态触发电路505，用于将开关的驱动信号展宽到设定的时间宽度以驱动自触发开关506的开启与关闭。
其中，单稳态触发电路505是基于555定时器构成的单稳态触发电路，暂稳态时间小于1us。自触发开关506的动作时间小于10ns。
信号输出接口404，用于将各路经过隔离处理后的信号输出。
信号输出接口404可以优选地相应为射频信号接口，其频率响应范围为大于300MHz到小于1.5GHz。
此时，局部放电特高频信号经过局部放电特高频信号延时电路502的一定时间的延时，恰好在第二子信号启动开关后传输到达自触发开关，从而保证了特高频信号完整地通过自触发开关，实现了信号的自触发单向传输，进而实现多路局部放电特高频信号的无干扰并行连接，避免了信号传输过程中的损耗。
由以上技术方案可见，本发明实施例提供的该多路信号并行连接装置，通过接收多个传感器输入的信号，并对每个所述信号进行放大等预处理，得到放大信号，将所述放大信号进行隔离处理，使信号能够自触发单向传输，最后将各路经过隔离处理后的信号完整地输出。本发明与现有技术相比，通过对多路信号进行放大隔离处理，使得信号能够自触发单向传输及隔离，进而实现多路局部放电信号的无干扰并行连接，进一步地避免了传输信号过程中信号的损耗。
同时，该多路局部放电信号并行连接装置，由于并行连接的局部放电检测信号都传 入到信号总线，一个数据采集装置可以同时监测多个信号，从而实现了通过同一套数据采集装置进行数据采集，以较低的成本实现对多个电力设备的同步在线监测，及时发现电力设备的绝缘缺陷，提高设备运行安全的目的。
以上对本发明的具体实施例进行了描述。需要理解的是，本发明并不局限于上述特定实施方式，本领域技术人员可以在权利要求的范围内做出各种变形或修改，这并不影响本发明的实质内容。

Claims (10)

  1. 一种多路局部放电信号并行连接方法，其特征在于，包括如下步骤：
    步骤1.1：接收多个传感器输入的传感信号，其中，所述传感信号包括局部放电特高频信号、超声信号、高频电流信号；
    步骤1.2：对每个所述传感信号进行预处理，包括放大和滤波，得到放大滤波后的信号；
    步骤1.3：将所述放大滤波后的信号通过自触发开关进行隔离处理，使信号能够自触发单向传输；
    步骤1.4：将各路经过隔离处理后的信号输出；
    其中，将所述放大滤波后的信号进行隔离处理包括如下步骤：
    步骤1.3.1：将所述放大滤波后的信号分为第一子信号与第二子信号；
    步骤1.3.2A：若所述第一子信号是局部放电特高频信号，则将第一子信号经过设定的延时时间来进行延时传输，延时传输后的第一子信号分成多个频段信号组，各组信号经过延时后，通过信号合成器进行组合合并后再放大；然后通过自触发开关输出、或者然后通过自触发开关输出后再将自触发开关输出的信号进行检波处理；
    若所述第一子信号是高频电流信号或者超声信号，则将第一子信号经延时或者不经延时直接通过自触发开关输出；
    步骤1.3.2B：所述第二子信号与参考电平进行比较实现信号的自动检测，并将所述第二子信号转变为开关的驱动信号；
    步骤1.3.3：将所述开关的驱动信号展宽到设定的时间宽度以驱动自触发开关的开启与关闭。
  2. 根据权利要求1所述的多路局部放电信号并行连接方法，其特征在于，所述局部放电特高频信号的延时传输采用声表面波延迟线组实现，高频电流信号及超声信号的延时传输通过射级跟随电路实现。
  3. 根据权利要求2所述的多路局部放电信号并行连接方法，其特征在于，局部放电特高频信号延时传输的信号频段为400MHz～500MHz，700MHz～800MHz，1100MHz～1200MHz。
  4. 根据权利要求1所述的多路局部放电信号并行连接方法，其特征在于，所述参考电平为可调参考电平。
  5. 根据权利要求1所述的多路局部放电信号并行连接方法，其特征在于，所述开 关的驱动信号为电压恒定、脉宽与接收的传感信号一致的方波信号。
  6. 一种多路局部放电信号并行连接装置，其特征在于，包括如下装置：
    信号输入接口，用于接收多个传感器输入的传感信号，其中，所述传感信号包括局部放电特高频信号、超声信号、高频电流信号；
    信号放大电路，用于对每个所述传感信号进行预处理，包括放大和滤波，得到放大滤波后的信号；
    信号隔离电路，用于将所述放大滤波后的信号进行隔离处理，使信号能够自触发单向传输；
    信号输出接口，用于将各路经过隔离处理后的信号输出。
    其中，所述信号隔离电路包括：
    信号分离电路，用于将所述放大滤波后的信号分为第一子信号与第二子信号；
    局部放电特高频信号延时电路，用于当所述第一子信号为局部放电特高频信号时，将所述第一子信号经过设定的延时时间来进行延时传输；
    当所述第一子信号为高频电流信号或者超声信号时，第一子信号经射级跟随电路延时后或者不经延时直接通过自触发开关输出；
    信号合成电路，用于将经所述局部放电特高频信号延时电路延时传输后的第一子信号分成的多个频段信号进行组合合并后放大，进而传输给自触发开关输出；
    参考电压电路，用于提供参考电平；
    高速比较电路，用于将所述第二子信号与所述参考电平进行比较实现信号的自动检测，并将所述第二子信号转变为开关的驱动信号；
    单稳态触发电路，用于将所述开关的驱动信号展宽到设定的时间宽度以驱动自触发开关的开启与关闭。
  7. 根据权利要求6所述的多路局部放电信号并行连接装置，其特征在于，所述局部放电特高频信号的延时传输采用声表面波延迟线组实现。
  8. 根据权利要求7所述的多路局部放电信号并行连接装置，其特征在于，局部放电特高频信号延时传输的信号频段为400MHz～500MHz，700MHz～800MHz，1100MHz～1200MHz。
  9. 根据权利要求6所述的多路局部放电信号并行连接装置，其特征在于，所述参考电平为可调参考电平。
  10. 根据权利要求6所述的多路局部放电信号并行连接装置，其特征在于，所述 开关的驱动信号为电压恒定、脉宽与接收的传感信号一致的方波信号。
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