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Numéro de publicationCN103675613 A
Type de publicationDemande
Numéro de demandeCN 201310534570
Date de publication26 mars 2014
Date de dépôt1 nov. 2013
Date de priorité1 nov. 2013
Autre référence de publicationCN103675613B
Numéro de publication201310534570.4, CN 103675613 A, CN 103675613A, CN 201310534570, CN-A-103675613, CN103675613 A, CN103675613A, CN201310534570, CN201310534570.4
Inventeurs陈雅云, 林建勤, 郭建钊, 苏祖礼, 李祖选, 许灵通, 关少锋
Déposant国家电网公司, 国网福建省电力有限公司, 国网福建省电力有限公司泉州供电公司
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes:  SIPO, Espacenet
Transformer station DC system movable type insulation supervision instrument
CN 103675613 A
Résumé
The invention discloses a transformer station DC system movable type insulation supervision instrument. The instrument comprises a supervision host, a data acquisition device and a movable type sensor, wherein the supervision host comprises a bridge circuit, a protection circuit, a low-frequency signal generator, an analog-to-digital conversion circuit, a microprocessor, an alarm device, a display device, a communication module and a photoelectric isolation device, and the data acquisition device comprises more than one set of a simulation selection switch, an amplifier, a band pass filter, a phase comparator, a filter, an analog-to-digital conversion circuit and a microprocessor which are connected. The transformer station DC system movable type insulation supervision instrument has a movable type characteristic, can simultaneously detect multiple loops, has high automation program degree adaptability, can perform supervision on a bridge of an original DC system of a transformer station, but can detect impedance of the original bridge, and can set an original circuit through setting a menu.
Revendications(6)  Langue du texte original : Chinois
1.一种变电站直流系统移动式绝缘监察仪,其特征在于:包括有监察主机,数据采集装置及移动式传感器,所述的监察主机包含有电桥电路、保护电路、超低频信号发生器、模数转换电路,微处理器、报警装置、显示装置、通讯模块、光电隔离装置,所述保护电路实现母线监测,在电桥电路检测到母线接地后,保护电路控制超低频信号发生器工作并同步输出同步信号到数据采集装置,所述的电桥电路包括有平衡桥检测电路及不平衡桥检测电路;保护电路通过触发控制超低频信号发生器与微处理器相连,电桥电路通过模数转换与微处理器相连,微处理器还与通讯模块、光电隔离装置、报警装置及显示装置相连,光电隔离装置通过串口连接数据采集装置; 所述的数据采集装置包含有一组以上的相连接的模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路及微处理器,所述的模拟选择开关通过移动式传感器获取感应电流信号,所述的监察主机控制超低频信号发生器工作同时输出同步信号到数据采集装置的相位比较器,在监察主机监测到母线接地后,主机向直流系统注入超低频信号源,数据采集将接收移动式传感器送来的感应电流经模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路送入微处理器进行处理,再通过微处理器的串行接口送入监察主机; 所述移动式传感器卡在母线的每个支路回路上,如果支路回路上有电阻接地,则装在该支路上的传感器产生感应电流,感应电流的大小与支路接地电阻的阻值成反比。 A mobile substation DC system insulation monitoring device, characterized by: including monitoring host, data acquisition devices and mobile sensors to monitor the host described contains a bridge circuit, protection circuits, ultra-low frequency signal generator, analog-digital conversion circuits, microprocessors, alarm devices, display devices, communication modules, optical isolation device, the protection circuits monitor the bus, after the bridge circuit detects the bus ground protection circuit control efforts and ultra-low frequency signal generator synchronized output synchronizing signal to the data acquisition means, said bridge circuit comprising a balanced bridge unbalance bridge detection circuit and detecting circuit; protection circuit is triggered by the control ultra-low frequency signal generator coupled to the microprocessor, the bridge circuit by modulo converter connected with the microprocessor, and the microprocessor further communication module, optical isolation means, connected to the alarm device and display device, the optical isolation device connected to the serial port via data acquisition device; data collection means comprises more than one group is connected to analog selector switch, amplifier, band pass filter, a phase comparator, filters, analog-digital conversion circuits and microprocessors, analog selector switch get the induced current signal by moving the sensor to monitor the host of the ultra-low frequency control signal generator output synchronization signal simultaneously to the phase comparator data acquisition device, in surveillance to monitor the bus ground after the host, the host system to the DC injection ultra low frequency signal source, data collection mobile sensor will receive the induced current sent through simulation selector switch, an amplifier, a bandpass filter, a phase comparator, a filter, analog-digital conversion circuit into the microprocessor for processing, and then sent to the host via the microprocessor monitoring the serial interface; the mobile sensor card bus Each branch back on the road, if there is resistance grounded branch back on the road, is inversely proportional to the resistance of the installed generating induced current, induced current size and branch grounding resistance in the branch road sensors.
2.根据权利要求1所述的一种变电站直流系统移动式绝缘监察仪,其特征在于:所述的电桥电路中平衡电桥电路与不平衡电桥电路的设定为:根据现场原有直流系统电源监测仪的原理进行设定,当原有变电站的电路为平衡电路时,若设备产生故障后电桥不能退出,当再投入变电站直流系统移动式绝缘监察仪时,先采用不平衡电路监测时,设定装置参数的修正值设定为O再投入测量,测出原设备上平衡桥上的电阻值,将测出的电阻值做修正值进行修正后,再选择平衡电路测量,监察仪在求取接地电阻时,CPU会根据设定的修正值来改变原计算公式中的系数,即可消除原平衡电路影响,使再投入的设备监测准确,不会产生误报;当原有变电站的电路为不平衡电路时,若原直流系统电源监测设备产生故障后,为防止两套不平衡电路工作的装置同时投入,引起的误检测或误报,需先将故障装置电源关闭后,同理采用上述不平衡电桥方法测量,进行数据修正,然后再投入不平衡电路运行, 由于不平衡电路监测,计算公式比较复杂,在对较大接地电阻时,计算精度较差,因此采取实验校准方法,将实验所得的数据列表存入寄存器,再按原设定修正值进行查表计算处理,消除原平衡电路对测量的精度影响,使再投入的设备监测准确,不会产生误报。 2. According to a mobile substation DC system insulation monitoring device according to claim 1, characterized in that: the balance of the bridge circuit is set in a bridge circuit and unbalanced bridge circuit is: according to the site of the original DC system power monitor principle set, when the circuit is balanced when the original substation circuit, the bridge can not exit if the equipment failure, when reinvested mobile substation DC system insulation monitoring device, first using unbalanced circuit While monitoring, setting device parameters correction value is set to O reinvested measure, measure the balance of the original equipment on the bridge resistance value, the resistance value will be measured correction value is corrected, and then select the balanced circuit measurement, monitoring When ground resistance meter strike, CPU will be set according to the correction value to change the original formula for calculating the coefficients, you can eliminate the impact of the original balance circuit, so reinvested accurate monitoring equipment does not produce false positives; when the original When the circuit is unbalanced circuit substation, if the original DC system power after monitoring equipment failure, to prevent two unbalanced circuit device while input error detection or cause false positives for the first post-fault system is turned off, with Management uses these methods to measure unbalanced bridge for data correction, and then put into unbalanced circuit operation, due to the unbalanced circuit monitoring, the formula is more complicated, when in the larger of the grounding resistance calculation accuracy is poor, so take the experimental calibration method, the experimental data obtained in the list into the register, then the value of the original set correction look-up table calculation process, eliminate the influence of the original balance of precision measuring circuit, so reinvested accurate monitoring equipment does not produce false positives.
3.根据权利要求2所述的一种变电站直流系统移动式绝缘监察仪,其特征在于:所述的移动式传感器为卡钳式移动传感器,所述的卡钳为强磁材料制成,且采用电磁屏蔽。 3. A mobile substation DC system insulation monitoring apparatus according to claim 2, wherein: said mobile sensor as the mobile sensor caliper, the caliper is made of magnetic material, and the use of electromagnetic shielded.
4.根据权利要求3所述的一种变电站直流系统移动式绝缘监察仪,其特征在于:所述的卡钳为配置有不同尺寸与形状的卡钳式检测探头。 The claim of a mobile substation DC system insulation monitoring device 3, characterized in that: the caliper is configured with a different size and shape detection probe caliper.
5.根据权利要求4所述的一种变电站直流系统移动式绝缘监察仪,其特征在于:所述的数据采集装置中的放大器为采用低噪声、低漂移、低功耗、高隔离度的运算放大器与数据放大器。 5. According to a mobile substation DC system insulation monitoring device according to claim 4, wherein: data acquisition device according to the amplifier for low noise, low drift, low power consumption, high isolation operation Amplifier and Data amplifier.
6.根据权利要求5所述的一种变电站直流系统移动式绝缘监察仪,其特征在于:所述的监察主机的微处理器的工作流程为:在对移动式绝缘监察仪进行正确参数设置后,监察装置正常投入运行,实时进行母线电压及母线对地绝缘检测, 当直流母线采集的运行电压与装置设置超压或欠压定值进行比较,超出设置定值后时,则发出“母线超压”或“母线欠压”报警,点亮驱动主机装置面板“超压报警”或“欠压报警”指示灯,同时接通“超欠压报警”硬接点, 然后根据设定的电桥,检测母线对地绝缘情况,当检测母线对地电阻值小于设置绝缘电阻定值时,则发出“绝缘报警”,点亮驱动主机装置面板“绝缘报警”指示灯,同时接通“绝缘报警”硬接点, 在检测母线接地后,主机CPU控制超低频信号发生器向母线注入超低频交流信号,同时发出同步信号至数据采集装置的相位对比器, 数据采集将接收移动式传感器送来的感应电流经模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路送入微处理器进行处理,再通过微处理器的串行接口送入监察主机,监察主机逐路巡检支路采样信息,所述近信息包括幅值及相位,与装置设定的支路接地门限值进行比较,从而判断出接地支路和接地阻值,在检测到有支路发生接地后,发出“支路报警”,点亮驱动主机装置面板“支路报警”指示灯,同时接通“支路报警”硬接点,如果在对所有支路全部巡检一遍,未发现接地支路,则重新返回起始点进行母线检测,重复上述工作, 在上述设备报警后,CPU同时控制通信模块,通过485、232等通信方式将报警及动作信息上传远方监控系统。 6. According to a mobile substation DC system insulation monitoring device according to claim 5, wherein: the monitoring workflow host microprocessor to: after insulation monitoring device for mobile correct parameter settings monitoring device normally put into operation, real-time bus voltage and bus-ground insulation testing, when the operating voltage and the device is set over voltage or under voltage DC bus acquisition value is compared to the given time value is exceeded, then issued a "super bus pressure "or" bus undervoltage "alarm, lighting drive host device Panel" overpressure alarm "or" undervoltage alarm "indicator, while on" super-voltage alarm, "Yingjie point, and then set the bridge, detects the bus ground insulation, when detecting bus to ground resistance values less than the set value of insulation resistance is issued "Insulation Alarm", highlight the drive host device panel "Insulation warning" indicator, while on "insulation alarm" hard contact after the bus ground detection, control over the host CPU bus frequency signal generator to inject ultra-low frequency AC signal, also issued a phase contrast signal to synchronize the data acquisition device, data collection mobile sensor will receive the induced current sent through analog selector switch, amplifier, band pass filter, a phase comparator, filters, analog to digital conversion circuitry into the microprocessor for processing, and then into the monitoring host via the serial interface microprocessor to monitor a host-by-channel data logging support Road sampling information, the recent information, including amplitude and phase, and device settings branch grounding threshold are compared to determine the ground and the ground slip resistance, detects a slip occurs in the ground, the issue "branch Alarm", highlight the drive host device panel "branch alarm" indicator, while on "branch Alarm" Yingjie point, if at all branches of all inspection again found no ground slip, re return to the starting point were the bus detection, repeating the above work, after said alarm device, CPU while controlling the communication module, communication by 485,232, etc. and the alarm information is uploaded remote operation monitoring system.
Description  Langue du texte original : Chinois

变电站直流系统移动式绝缘监察仪 Mobile substation DC system insulation monitoring device

技术领域 FIELD

[0001] 本发明涉及一种绝缘监察仪,特别是一种变电站直流系统移动式绝缘监察仪。 [0001] The present invention relates to an insulation monitoring device, particularly a mobile substation DC system insulation monitoring device.

[0002] [0002]

背景技术 BACKGROUND

[0003]目前国内的直流电源绝缘监测装置都为固定式的,只能装在某一变电站工作,如果绝缘监察装置发生设备故障,在排除监测装置故障期间,此时变电站直流电源失去绝缘监察装置工作,给直流电源安全运行带来隐患。 [0003] Currently the DC power supply insulation monitoring devices are fixed, and can only be installed in a substation work, if the insulation monitoring device equipment failure, the exclusion of the monitoring device failure during this time losing power substation DC insulation monitoring device work to the safe operation of the DC power supply and security. 为保证电力系统安全运行,必须及时换上一套通用直流绝缘监测设备,进行直流系统绝缘监察。 To ensure the safe operation of the power system must be promptly put a common DC insulation monitoring device, the DC system insulation monitoring.

发明内容 SUMMARY

[0004] 本发明的目的在于克服现有技术的不足之处,而提供一种适用各种直流系统、便于应急时投入使用,从而能及时、有效地保证直流系统的正常运行的变电站直流系统移动式绝缘监察仪。 [0004] The present invention is to overcome the deficiencies of the prior art, and provide a variety of DC systems suitable for easy use in case of emergency, in order to be able to promptly and effectively to ensure the normal operation of the current system of substation DC system for mobile Insulation monitoring device.

[0005] 一种变电站直流系统移动式绝缘监察仪,包括有监察主机,数据采集装置及移动式传感器,所述的监察主机包含有电桥电路、保护电路、超低频信号发生器、模数转换电路,微处理器、报警装置、显示装置、通讯模块、光电隔离装置,所述保护电路实现母线监测,在电桥电路检测到母线接地后,保护电路控制超低频信号发生器工作并同步输出同步信号到数据采集装置,所述的电桥电路包括有平衡桥检测电路及不平衡桥检测电路;保护电路通过触发控制超低频信号发生器与微处理器相连,电桥电路通过模数转换与微处理器相连,微处理器还与通讯模块、光电隔离装置、报警装置及显示装置相连,光电隔离装置通过串口连接数据采集装置; [0005] A mobile substation DC system insulation monitoring device, including monitoring host, data acquisition devices and mobile sensors to monitor the host described contains a bridge circuit, protection circuits, ultra-low frequency signal generator, analog to digital conversion circuits, microprocessors, alarm devices, display devices, communication modules, optical isolation device, the protection circuits monitor the bus, after the bridge circuit detects the bus ground to protect the ultra-low frequency signal generator circuit control and synchronize output synchronous work signal to the data acquisition device, wherein the bridge circuit comprises a balanced bridge circuit and the detection bridge unbalance detecting circuit; protection circuit is triggered by super-low frequency control signal generator connected with the microprocessor, the bridge circuit through the analog to digital conversion and Microsystem a processor connected to the microprocessor and communication module also, optical isolators, alarm devices and display devices connected to optical isolation device via a serial connection data acquisition device;

所述的数据采集装置包含有一组以上的相连接的模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路及微处理器,所述的模拟选择开关通过移动式传感器获取感应电流信号,所述的监察主机控制超低频信号发生器工作同时输出同步信号到数据采集装置的相位比较器,在监察主机监测到母线接地后,主机向直流系统注入超低频信号源,数据采集将接收移动式传感器送来的感应电流经模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路送入微处理器进行处理,再通过微处理器的串行接口送入监察主机; Data collection means comprises an analog selection switch is connected to more than one group, the amplifier, band pass filter, a phase comparator, a filter, analog-digital conversion circuit and the microprocessor, the analog selection switch mobile Get induced current sensor signal, the host of the monitor control work at the same ultra-low frequency signal generator output sync signal to the data acquisition phase comparator means, in surveillance to monitor the bus ground after the host, the host system to the DC injection ultra low frequency signal source, The receiving mobile data acquisition sensor induced current sent through the analog selector switch, an amplifier, a bandpass filter, a phase comparator, a filter, analog-digital conversion circuit into the microprocessor for processing, and then through a serial microprocessor host interface into the monitor;

所述移动式传感器卡在母线的每个支路回路上,如果支路回路上有电阻接地,则装在该支路上的传感器产生感应电流,感应电流的大小与支路接地电阻的阻值成反比。 The mobile sensor card in the bus on the way back to each branch, the branch back on the road if there is resistance to ground, then mounted in the branch road sensor generates induced current, induced current size and slip into a grounding resistor inversely.

[0006] 本发明的变电站直流系统移动式绝缘监察仪,可实现对直流系统线线接地,支路接地查找,过欠压检测,并根据检测结果提供报警信息输出及显示装置显示,同时还可将数据通过通信接口电路传送给上位机由于本发明配备了两个电桥,因此可以使用在不同的变电站直流系统中,由于在数据采集装置中采用了相位比较器,其能消除支路回路上的对地电容对测量接地电阻精确度的影响,同时也可以克服母线上非同步交流信号干扰。 [0006] The present invention substation DC system insulation monitoring mobile device, can be realized on the DC system grounding wire line, branch grounding find, over-voltage detection, and provide alarm outputs and display means for displaying information, while also based on test results The data is transmitted via the communication interface circuit to the host computer as a result of the present invention is equipped with two bridges, and therefore can be used in different substation DC system, because the data acquisition device with a phase comparator, which can eliminate the slip back on the road The impact to ground resistance capacitance measurement accuracy of, but can also be overcome asynchronous AC signal interference on the bus. 由于采用了移动式传感器,因此多个变电站只要采用一套的移动式绝缘检测仪设备,这样可以节省大量设备费用。 As a result of the movement sensor, so long as the use of a multiple substations insulation tester mobile device, so you can save a lot of equipment costs.

[0007] 所述的电桥电路中平衡电桥电路与不平衡电桥电路的设定为:根据现场原有直流系统电源监测仪的原理进行设定,当原有变电站的电路为平衡电路时,若设备产生故障后电桥不能退出,当再投入变电站直流系统移动式绝缘监察仪时,先采用不平衡电路监测时,设定装置参数的修正值设定为O再投入测量,测出原设备上平衡桥上的电阻值,将测出的电阻值做修正值进行修正后,再选择平衡电路测量,监察仪在求取接地电阻时,CPU会根据设定的修正值来改变原计算公式中的系数,即可消除原平衡电路影响,使再投入的设备监测准确,不会产生误报;当原有变电站的电路为不平衡电路时,若原直流系统电源监测设备产生故障后,为防止两套不平衡电路工作的装置同时投入,引起的误检测或误报,需先将故障装置电源关闭后,同理采用上述不平衡电桥方法测量,进行数据修正,然后再投入不平衡电路运行。 Bridge circuit [0007] in the balanced bridge circuit and the unbalance of the bridge circuit is set to: according to the site of the original DC power supply monitor system principles set, when the circuit is balanced circuit existing substation after equipment failure if the bridge can not quit, when reinvested mobile substation DC system insulation monitoring device, first using unbalanced circuit monitoring, setting device parameters correction value is set to O reinvested measure, measure the original balancing the resistance value of the bridge device, the measured resistance value to make the correction value is corrected, and then select the balance circuit measuring, monitoring instrument at the time of obtaining the grounding resistance, CPU based on the correction value set to change the original formula The coefficients can eliminate the impact of the original balance circuit, so reinvested accurate monitoring equipment does not produce false positives; when the existing substation circuit is unbalanced circuit, if the original DC system power after monitoring equipment failure, to prevent two devices at the same time put unbalanced circuit, false detection or false alarm caused by the need to first fault device is turned off, the same way using the above method to measure unbalanced bridge for data correction, and then put into unbalanced circuit operation . 由于不平衡电路监测,计算公式比较复杂,在对较大接地电阻时,计算精度较差,因此采取实验校准方法,将实验所得的数据列表存入寄存器,再按原设定修正值进行查表计算处理,消除原平衡电路对测量的精度影响,使再投入的设备监测准确,不会产生误报。 Due to unbalanced circuit monitoring, the formula is more complicated, when in the larger of the grounding resistance calculation accuracy is poor, so take the experimental calibration method, the experimental data obtained in the list into the register, then the original set value correction look-up table calculation process, eliminating the impact of the original balance of the accuracy of the measurement circuit, so reinvested accurate monitoring equipment does not produce false positives.

[0008] 所述的移动式传感器为卡钳式移动传感器,所述的卡钳为强磁材料制成,且采用电磁屏蔽。 [0008] The mobile sensor is a movement sensor caliper, the caliper is made of magnetic material, and the use of electromagnetic shielding.

[0009] 所述的卡钳为配置有不同尺寸与形状的卡钳式检测探头。 [0009] The caliper is configured with a different size and shape detecting probe calliper.

[0010] 所述的数据采集装置中的放大器为采用低噪声、低漂移、低功耗、高隔离度的运算放大器与数据放大器。 Data acquisition device [0010], wherein the amplifier is a low noise, low drift, low power, high isolation amplifier operational amplifier and data.

[0011] 所述的监察主机的微处理器的工作流程为:在对移动式绝缘监察仪进行正确参数设置后,监察装置正常投入运行,实时进行母线电压及母线对地绝缘检测。 Workflow monitoring host [0011] wherein the microprocessor is: In mobile insulation monitoring device for proper parameter setting, monitoring devices normally put into operation, real-time bus voltage and bus to ground insulation test. 当直流母线采集的运行电压与装置设置超压或欠压定值进行比较,超出设置定值后时,则发出“母线超压”或“母线欠压”报警,点亮驱动主机装置面板“超压报警”或“欠压报警”指示灯,同时接通“超欠压报警”硬接点。 When the operating voltage and the device is disposed over voltage or under voltage DC bus acquisition value is compared to the given value is exceeded, then issued a "bus overpressure" or "bus undervoltage" alarm, lighting drive host device panel "super pressure alarm "or" undervoltage alarm "indicator, while on" super undervoltage alarm "Yingjie point. 然后根据设定的电桥,检测母线对地绝缘情况,当检测母线对地电阻值小于设置绝缘电阻定值时,则发出“绝缘报警”,点亮驱动主机装置面板“绝缘报警”指示灯,同时接通“绝缘报警”硬接点。 Then according to the bridge set to detect the insulation bus, when detecting bus to ground resistance values less than the set value of insulation resistance is issued "Insulation Alarm", highlight the drive host device panel "Insulation warning" indicator, Meanwhile on "Insulation Alarm" Yingjie point. 在检测母线接地后,主机CPU控制超低频信号发生器向母线注入超低频交流信号,同时发出同步信号至数据采集装置的相位对比器。 After detecting bus ground, control over the host CPU bus frequency signal generator to inject ultra-low frequency AC signal, also issued a phase contrast signal synchronized to the data acquisition device. 数据采集将接收移动式传感器送来的感应电流经模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路送入微处理器进行处理,再通过微处理器的串行接口送入监察主机,监察主机逐路巡检支路采样信息(包括幅值及相位),与装置设定的支路接地门限值进行比较,从而判断出接地支路和接地阻值,在检测到有支路发生接地后,发出“支路报警”,点亮驱动主机装置面板“支路报警”指示灯,同时接通“支路报警”硬接点,如果在对所有支路全部巡检一遍,未发现接地支路,则重新返回起始点进行母线检测,重复上述工作。 The receiving mobile data acquisition sensor induced current sent through the analog selector switch, an amplifier, a bandpass filter, a phase comparator, a filter, analog-digital conversion circuit into the microprocessor for processing, and then through a serial microprocessor interface into the monitoring host, host-by-channel data logging monitor branch sampling information (including amplitude and phase), and device settings branch grounding threshold are compared to determine the ground and the ground slip resistance, in detects a ground slip issued after "branch Alarm", highlight the drive host device panel "branch alarm" indicator, while on "branch Alarm" Yingjie point, if at all branches of all inspection again, not found grounded branch, then return to the starting point of the bus were detected, repeat the above work. 在上述设备报警后,CPU同时控制通信模块,通过485、232等通信方式将报警及动作信息上传远方监控系统。 After the above-mentioned equipment alarms, CPU while controlling the communication module by 485,232 other means of communication and action information is uploaded to the remote alarm monitoring system.

[0012] 综上所述的,本发明相比现有技术如下优点: [0012] In summary, the present invention compared to the prior art the following advantages:

本发明的变电站直流系统移动式绝缘监测仪,具有移动式特点,又能同时检测多个回路,且自动化程序度适应性强,又能在变电站原有的直流系统的电桥进行监检,但检测出原来电桥的阻抗,通过设定菜单对原有电路设定,屏蔽正常运行时检测出原有系统的平衡桥,使用设备恢复正常的运行界面,可以把这套的设备作为多个变电站的备用设备。 Substation DC system of the invention mobile IMS with mobile features, but also simultaneously detect multiple loops, and the degree of adaptability and automation program, but also in the original bridge substation DC system's supervisory inspection, but detect the impedance of the original bridge, through the setup menu is set to the original circuit, shielding the normal operation of the existing system of balancing the bridge, using the device detects the normal operation of the interface, the device can be set as a multiple substations spare equipment. 本发明的变电站直流系统移动式绝缘监察仪的应用提高了电网运行的安全性与可靠性,经济与社会效益明显:多个变电站只要采用一套的移动式绝缘检测仪设备,这样可以节省大量设备费用;由于设备自动化程度高,移动方便,大大提高了变电站排除直流系统绝缘故障的效率,大大节省了因排除绝缘故障而造成的供电损失。 Substation DC system insulation monitoring device mobile application of the present invention to improve the power grid security and reliability, economic and social benefits obvious: more than just the use of a substation insulation tester mobile device, so you can save a lot of equipment costs; due to the high degree of automation equipment, easy to move, greatly improving the substation DC system insulation faults exclude efficiency, saving the power loss due to rule out an insulation fault caused. 同时也有效避免监察装置损坏期间变电站(特别是无人值守站)运行人员必须到站定时巡测,节省了人力的投入。 But also effectively avoid damage during the monitoring of substation equipment (especially unattended stations) must run timing patrol station, saving human input.

附图说明 Brief Description

[0013] 图1是本发明变电站直流系统移动式绝缘监察仪的电路构成。 [0013] The present invention Figure 1 is a mobile substation DC system insulation monitoring instrument circuit.

[0014] 图2是监察主机微处理器的工作流程图。 [0014] FIG. 2 is a flowchart of monitoring the host microprocessor.

具体实施方式 DETAILED DESCRIPTION

[0015] 下面结合实施例对本发明进行更详细的描述。 [0015] below with reference to embodiments of the present invention will be described in more detail.

[0016] 实施例1 [0016] Example 1

一种变电站直流系统移动式绝缘监察仪,包括有监察主机,数据采集装置及移动式传感器,所述的监察主机包含有电桥电路、保护电路、超低频信号发生器、模数转换电路,微处理器、报警装置、显示装置、通讯模块、光电隔离装置,所述保护电路实现母线监测,在电桥电路检测到母线接地后,保护电路控制超低频信号发生器工作并同步输出同步信号到数据采集装置,所述的电桥电路包括有平衡桥检测电路及不平衡桥检测电路;保护电路通过触发控制超低频信号发生器与微处理器相连,电桥电路通过模数转换与微处理器相连,微处理器还与通讯模块、光电隔离装置、报警装置及显示装置相连,光电隔离通过串口连接数据采集装置; Mobile Substations DC system insulation monitoring device, including monitoring host, data acquisition devices and mobile sensors to monitor the host described contains a bridge circuit, protection circuits, ultra-low frequency signal generator, analog-to-digital conversion circuits, micro processor, alarm devices, display devices, communication modules, optical isolation device, the protection circuits monitor the bus, after the bridge circuit detects the bus ground to protect the ultra-low frequency signal generator circuit control work and synchronization signals to synchronize the output data collecting means comprises a bridge circuit according to a balanced bridge unbalance bridge detection circuit and detecting circuit; protection circuit is triggered by super-low frequency control signal generator connected with the microprocessor, the bridge circuit is connected through analog to digital converter and a microprocessor The microprocessor also with the communication module, optical isolators, alarm devices and display device connected via opto-isolated serial port data acquisition device;

所述的数据采集装置包含有一组以上的相连接的模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路及微处理器,所述的模拟选择开关通过移动式传感器获取感应电流信号,所述的监察主机控制超低频信号发生器工作同时输出同步信号到数据采集装置的相位比较器,在监察主机监测到母线接地后,主机向直流系统注入超低频信号源,数据采集将接收移动式传感器送来的感应电流经模拟选择开关,放大器、带通滤波器、相位比较器、滤波器、模数转换电路送入微处理器进行处理,再通过微处理器的串行接口送入监察主机; Data collection means comprises an analog selection switch is connected to more than one group, the amplifier, band pass filter, a phase comparator, a filter, analog-digital conversion circuit and the microprocessor, the analog selection switch mobile Get induced current sensor signal, the host of the monitor control work at the same ultra-low frequency signal generator output sync signal to the data acquisition phase comparator means, in surveillance to monitor the bus ground after the host, the host system to the DC injection ultra low frequency signal source, The receiving mobile data acquisition sensor induced current sent through the analog selector switch, an amplifier, a bandpass filter, a phase comparator, a filter, analog-digital conversion circuit into the microprocessor for processing, and then through a serial microprocessor host interface into the monitor;

所述移动式传感器卡在母线的每个支路回路上,如果支路回路上有电阻接地,则装在该支路上的传感器产生感应电流,感应电流的大小与支路接地电阻的阻值成反比。 The mobile sensor card in the bus on the way back to each branch, the branch back on the road if there is resistance to ground, then mounted in the branch road sensor generates induced current, induced current size and slip into a grounding resistor inversely.

[0017] 所述的电桥电路中平衡电桥电路与不平衡电桥电路的设定为:根据现场原有直流系统电源监测仪的原理进行设定,当原有变电站的电路为平衡电路时,若设备产生故障后电桥不能退出,当再投入变电站直流系统移动式绝缘监察仪时,先采用不平衡电路监测时,设定装置参数的修正值设定为O再投入测量,测出原设备上平衡桥上的电阻值,将测出的电阻值做修正值进行修正后,再选择平衡电路测量,监察仪在求取接地电阻时,CPU会根据设定的修正值来改变原计算公式中的系数,即可消除原平衡电路影响,使再投入的设备监测准确,不会产生误报;当原有变电站的电路为不平衡电路时,若原直流系统电源监测设备产生故障后,为防止两套不平衡电路工作的装置同时投入,引起的误检测或误报,需先将故障装置电源关闭后,同理采用上述不平衡电桥方法测量,进行数据修正,然后再投入不平衡电路运行。 Bridge circuit [0017] in the balanced bridge circuit and the unbalance of the bridge circuit is set to: according to the site of the original DC power supply monitor system principles set, when the circuit is balanced circuit existing substation after equipment failure if the bridge can not quit, when reinvested mobile substation DC system insulation monitoring device, first using unbalanced circuit monitoring, setting device parameters correction value is set to O reinvested measure, measure the original balancing the resistance value of the bridge device, the measured resistance value to make the correction value is corrected, and then select the balance circuit measuring, monitoring instrument at the time of obtaining the grounding resistance, CPU based on the correction value set to change the original formula The coefficients can eliminate the impact of the original balance circuit, so reinvested accurate monitoring equipment does not produce false positives; when the existing substation circuit is unbalanced circuit, if the original DC system power after monitoring equipment failure, to prevent two devices at the same time put unbalanced circuit, false detection or false alarm caused by the need to first fault device is turned off, the same way using the above method to measure unbalanced bridge for data correction, and then put into unbalanced circuit operation . 由于不平衡电路监测,计算公式比较复杂,在对较大接地电阻时,计算精度较差,因此采取实验校准方法,将实验所得的数据列表存入寄存器,再按原设定修正值进行查表计算处理,消除原平衡电路对测量的精度影响,使再投入的设备监测准确,不会产生误报。 Due to unbalanced circuit monitoring, the formula is more complicated, when in the larger of the grounding resistance calculation accuracy is poor, so take the experimental calibration method, the experimental data obtained in the list into the register, then the original set value correction look-up table calculation process, eliminating the impact of the original balance of the accuracy of the measurement circuit, so reinvested accurate monitoring equipment does not produce false positives. 所述的移动式传感器为卡钳式移动传感器,所述的卡钳为强磁材料制成,且采用电磁屏蔽。 Said mobile sensor as the mobile sensor caliper, the caliper is made of magnetic material, and the use of electromagnetic shielding. 所述的卡钳为配置有不同尺寸与形状的卡钳式检测探头。 Said caliper is configured with a different size and shape detecting probe calliper.

[0018] 所述的数据采集装置采用低噪声、低漂移、低功耗、高隔离度的运算放大器与数据放大器,高精度的A/D转换器,功能较强的单片微处理器,构成窄带滤波器,相位比较器,精粗信号转换器,并进行信息与数据处理,测量值自动校正,通过设计新的抗干扰能力强、灵敏度高的线路与新的信号处理方法,提高探测仪的灵敏度与抗干扰能力。 Data acquisition device [0018] described the use of low noise, low drift, low power, high isolation amplifier operational amplifier and data, high-precision A / D converters, more powerful single-chip microprocessor, constitute narrowband filter, a phase comparator, VCDs and DVDs signal converters, and information and data processing, automatic calibration measurements, by designing a new and strong anti-interference ability, high sensitivity line with the new signal processing methods to improve sondes sensitivity and anti-jamming capability. 如果支路回路上有电阻接地,则装在该支路上的传感器产生感应电流,感应电流的大小与支路接地电阻的阻值成反比。 If there is resistance grounded branch back on the road, then installed in the branch circuit is inversely proportional to the resistance of the sensor to generate induced current, induced current size and branch grounding resistance. 感应电流信号经模拟选择开关、放大、带通滤波、相位比较、滤波、A/D转换、送CPU进行数据处理,再通过RS485接口送入主机。 Induced current signal by the analog selector switch, zoom, band-pass filter, a phase comparator, filtering, A / D conversion, sent to the CPU for data processing, and then sent to the host via the RS485 interface. 主机一方面控制信号采集模块有秩序地采集各支路传感信号,另一方面又接收信号采集模块送来的数据。 Host hand control signal acquisition module orderly acquisition sensor signals of each branch, on the other hand receives the signal acquisition module data sent. 信号采集模块中的相位比较器,其作用是消除支路回路上的对地电容对测量接地电阻精确度的影响,同时也可以克服母线上非同步交流信号干扰。 Signal acquisition module phase comparator, whose role is to eliminate the influence of the slip road back to earth ground resistance capacitance measurement accuracy, but also can overcome asynchronous AC signal interference on the bus. 主机接收到的数据经处理后,一方面送液晶显示器显示与输出报警,另一方面将数据通过通信接口电路传送给上位机。 Host receives data after treatment, on the one hand to send the LCD display and an alarm, on the other hand the data to the host computer via the communication interface circuits.

[0019] 本实施例未述部分与现有技术相同。 [0019] The present embodiment is not the same as said portion of the prior art.

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Classifications
Classification internationaleG01R31/02, G01R19/25, G01R31/12
Événements juridiques
DateCodeÉvénementDescription
15 oct. 2014C10Entry into substantive examination
18 juil. 2017GR01