CN103441725A - System for monitoring and controlling grounding currents of transformer core - Google Patents
System for monitoring and controlling grounding currents of transformer core Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
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Abstract
本发明公开了一种变压器铁芯接地电流监测和控制系统,它包括变压器、电流采集单元、单片机、控制模块,变压器与电流采集单元连接,所述单片机有两个接口模块,分别与电流采集单元、控制模块连,所述控制模块包括电机、转动装置和可调电阻,所述电流采集单元的两个电流输入端分别与两个熔断器上端连接,所述熔断器设置在变压器铁芯接地线和变压器加件接地线上,可调电阻的两个输出端分别连接在两个熔断器的下端,本发明所检测的电流大于存入单片机中的额定值时,单片机会自动控制控制电路对可调电阻进行调节,直到变压器铁芯电流小于单片机中储存的额定电流为止,减轻了操作者的工作负担,减少设备两次检测之间因电流过大对用电用户的用电造成的影响。
The invention discloses a transformer iron core grounding current monitoring and control system, which includes a transformer, a current acquisition unit, a single-chip microcomputer, and a control module. , a control module, the control module includes a motor, a rotating device and an adjustable resistor, the two current input terminals of the current acquisition unit are respectively connected to the upper ends of two fuses, and the fuses are arranged on the ground wire of the transformer core and the grounding line of the transformer plus part, the two output terminals of the adjustable resistor are respectively connected to the lower ends of the two fuses. When the current detected by the present invention is greater than the rated value stored in the microcontroller, the microcontroller automatically controls the control circuit to Adjust the resistance to adjust until the transformer core current is less than the rated current stored in the single-chip microcomputer, which reduces the workload of the operator and reduces the impact of the excessive current on the power consumption of the power user between the two detections of the equipment.
Description
the
技术领域:Technical field:
本发明涉及一种接地电流监测及控制装置,特别是涉及一种变压器铁芯接地电流监测和控制系统。 The invention relates to a grounding current monitoring and control device, in particular to a transformer iron core grounding current monitoring and control system.
背景技术:Background technique:
国家电网规定110KV等级变压器每年检测一次,220KV等级以上的变压器每年检测两次,要求运行中变压器铁芯电流不大于0.1A,每年带电测试的时候,操作者都是使用普通的钳形电流表测量变压器铁心接地扁铁的电流值,并记录。这种方法的弊端是普通电流钳测量准确度低,容易受干扰,两次预防性检测时间间隔长,突发的接地电流超限故障很难发现。 State Grid stipulates that 110KV level transformers should be tested once a year, and transformers with 220KV level and above should be tested twice a year. It is required that the transformer core current during operation should not exceed 0.1A. During the live test every year, the operator uses an ordinary clamp ammeter to measure the transformer. The current value of the iron core grounded flat iron, and record. The disadvantages of this method are that ordinary current clamps have low measurement accuracy, are susceptible to interference, and the time interval between two preventive inspections is long, making it difficult to find sudden ground current overrun faults.
在检测时,当变压器铁芯接地电流值超过规定的0.1A时,操作者通常是断开铁芯接地线,串联上可调电阻和电流表,手动调节电阻,观察电流表数值直到低于0.1A,再将可调电阻更换为固定阻值的大功率电阻,去掉电流表,回复接地引线,等待大修处理。这种方法的弊端是临时处理过程复杂,时间长,串联电阻电路不具备防水功能,大修及检测周期长,在等待大修期间不能确保变压器铁芯电流不会再次超过0.1A。 During detection, when the transformer core ground current value exceeds the specified 0.1A, the operator usually disconnects the core ground wire, connects an adjustable resistor and ammeter in series, manually adjusts the resistance, and observes the value of the ammeter until it is lower than 0.1A. Then replace the adjustable resistor with a high-power resistor with fixed resistance, remove the ammeter, restore the grounding lead, and wait for overhaul. The disadvantage of this method is that the temporary processing process is complicated and takes a long time, the series resistance circuit does not have waterproof function, the overhaul and inspection cycle is long, and it cannot be guaranteed that the transformer core current will not exceed 0.1A again during the waiting period for overhaul.
the
发明内容:Invention content:
本发明所要解决的技术问题是:克服现有技术的不足,提供一种简单实用,能够实时检测及控制变压器铁芯接地电流的变压器铁芯接地电流监测和控制系统。 The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a simple and practical transformer core ground current monitoring and control system capable of real-time detection and control of the transformer core ground current.
本发明的技术方案是:一种变压器铁芯接地电流监测和控制系统,包括变压器、电流采集单元、单片机、控制模块,其中:变压器与电流采集单元连接,所述单片机有两个接口模块,分别与电流采集单元、控制模块连,所述控制模块包括电机、转动装置和可调电阻。 The technical solution of the present invention is: a transformer core grounding current monitoring and control system, including a transformer, a current acquisition unit, a single-chip microcomputer, and a control module, wherein: the transformer is connected to the current collection unit, and the single-chip microcomputer has two interface modules, respectively It is connected with the current acquisition unit and the control module, and the control module includes a motor, a rotating device and an adjustable resistance.
所述电流采集单元的两个电流输入端分别与两个熔断器上端连接,所述熔断器设置在变压器铁芯接地线和变压器加件接地线上,可调电阻的两个输出端分别连接在两个熔断器的下端。所述单片机通过通讯模块及电力APN专网与控制中心的计算机连接。所述电流采集单元与变压器和单片机之间的连接导线均为2芯带屏蔽线,且单片机、通讯模块、电流采集单元、控制模块外面设置有防水防电磁设施。所述单片机与电流采集单元之间通过RS485接口连接,并提供24V电压。 The two current input terminals of the current acquisition unit are respectively connected to the upper ends of two fuses, the fuses are arranged on the transformer core ground wire and the transformer add-on ground wire, and the two output terminals of the adjustable resistor are respectively connected to the The lower end of the two fuses. The single-chip microcomputer is connected with the computer of the control center through the communication module and the electric power APN private network. The connecting wires between the current acquisition unit, the transformer and the single-chip microcomputer are 2-core shielded wires, and the single-chip microcomputer, the communication module, the current collection unit, and the control module are provided with waterproof and anti-electromagnetic facilities. The single-chip microcomputer is connected with the current acquisition unit through the RS485 interface, and provides 24V voltage.
本发明的有益效果是: The beneficial effects of the present invention are:
1、本发明所检测的电流大于存入控制电路的额定值时,通过电力APN专网以GPRS无线传输方式,把数据发送到控制中心的计算机,提醒操作者对设备进行及时维修,且以电力APN专网传输数据保障了通讯数据的准确与安全。 1. When the current detected by the present invention is greater than the rated value stored in the control circuit, the data is sent to the computer in the control center through the power APN private network in the form of GPRS wireless transmission, and the operator is reminded to maintain the equipment in time. APN private network transmission data guarantees the accuracy and security of communication data.
2、本发明所检测的电流大于存入单片机中的额定值时,单片机会自动控制控制电路对可调电阻进行调节,直到变压器铁芯电流小于单片机中储存的额定电流为止,减轻了操作者的工作负担,减少设备两次检测之间因电流过大,对用电用户的用电造成影响。 2. When the current detected by the present invention is greater than the rated value stored in the single-chip microcomputer, the single-chip microcomputer automatically controls the control circuit to adjust the adjustable resistance until the transformer core current is less than the rated current stored in the single-chip microcomputer. Work burden, reduce the impact on the power consumption of power users due to excessive current between two detections of equipment.
3、本发明系统的安装不改变原有电力设备的接线、接地模式,不会对一次系统造成任何干扰和影响,且采用电磁屏蔽外壳,防止变压器产生的磁场对设备的检测及控制精度造成影响。 3. The installation of the system of the present invention does not change the wiring and grounding mode of the original power equipment, and will not cause any interference or influence on the primary system, and the electromagnetic shielding shell is used to prevent the magnetic field generated by the transformer from affecting the detection and control accuracy of the equipment .
4、本发明设置有熔断器,变压器铁芯接地线和变压器加件接地线上的电流超过一定值时会自动熔断,切断原有接地线,并把电流自动控制装置连接到变压器铁芯和变压器加件接地线中,实现了操作的自动化。 4. The present invention is equipped with a fuse. When the current on the ground wire of the transformer core and the ground wire of the transformer add-on exceeds a certain value, it will automatically fuse, cut off the original ground wire, and connect the automatic current control device to the transformer core and the transformer. In the addition of the ground wire, the automation of the operation is realized.
5、本发明简单实用,能够实时检测及控制变压器铁芯接地电流,其适用范围广,方便操作者的操作,节省人力物力,易于推广实施。 5. The invention is simple and practical, can detect and control the ground current of the transformer iron core in real time, has a wide application range, is convenient for operators to operate, saves manpower and material resources, and is easy to popularize and implement.
附图说明:Description of drawings:
图1为变压器铁芯接地电流监测和控制系统连接示意图。 Figure 1 is a connection schematic diagram of the transformer core ground current monitoring and control system.
具体实施方式:Detailed ways:
实施例:参见图1,图中,1-变压器铁芯接地线,2-变压器夹板接地线,3-熔断器,4-电流采集单元,5-单片机,6-通讯模块,7-电机,8-可调电阻,9-控制中心计算机,10-变压器,11-防水、防电磁箱。 Embodiment: See Figure 1, in the figure, 1-transformer core ground wire, 2-transformer splint ground wire, 3-fuse, 4-current acquisition unit, 5-single-chip microcomputer, 6-communication module, 7-motor, 8 -Adjustable resistance, 9-Control center computer, 10-Transformer, 11-Waterproof, anti-electromagnetic box.
变压器铁芯接地电流监测和控制系统:它包括变压器10、电流采集单元4、单片机5、控制模块,其中:变压器10与电流采集单元4连接,单片机5有两个接口模块,分别与电流采集单元4、控制模块连,控制模块包括电机7、转动装置和可调电阻8。
Transformer core grounding current monitoring and control system: it includes a
电流采集单元4的两个电流输入端分别与两个熔断器3上端连接,熔断器3设置在变压器铁芯接地线1和变压器加件接地线2上,可调电阻8的两个输出端分别连接在两个熔断器3的下端。
The two current input ends of the current acquisition unit 4 are respectively connected to the upper ends of two fuses 3, the fuses 3 are set on the transformer
单片机5通过通讯模块6及电力APN专网与控制中心的计算机连接。 The single-chip microcomputer 5 is connected with the computer of the control center through the communication module 6 and the electric power APN private network.
电流采集单元4与变压器10和单片机5之间的连接导线均为2芯带屏蔽线,且单片机5、通讯模块6、电流采集单元4、控制模块外面设置有防水防电磁设施。
The connecting wires between the current collection unit 4, the
单片机5与电流采集单元4之间通过RS485接口连接,并提供24V电压。 The single-chip microcomputer 5 is connected with the current acquisition unit 4 through the RS485 interface, and provides 24V voltage.
使用时,变压器铁芯接地线1和变压器加件接地线2上熔断器3的上端分别与电流采集单元4的两个电流输入口连接,电流采集单元4把检测到的电信号经过调整发送到单片机5中,单片机5根据存入的额定值与输入电信号值进行比较,如果输入电信号值小于存入的额定值,则设备继续运行,如果输入电信号值大于存入的额定值,则单片机5通过电力APN专网以GPRS无线传输方式,把输入电信号值发送到控制中心的计算机上,同时自动控制电机7对可调电阻8进行调节,直到变压器铁芯电流小于单片机5中储存的额定电流为止。
When in use, the upper ends of the fuse 3 on the transformer
以上所述,仅是本发明的较佳实施例而已,并非对本发明作任何形式上的限制,凡是依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰,均仍属于本发明技术方案的范围内。 The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to within the scope of the technical solutions of the present invention.
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CN105042465A (en) * | 2015-06-02 | 2015-11-11 | 绵阳科耀电子科技有限公司 | LED automobile headlamp capable of dynamically adjusting light color temperature |
CN106199164A (en) * | 2016-06-28 | 2016-12-07 | 国网河南桐柏县供电公司 | A kind of measuring method of transformer iron core grounding current |
CN106546631A (en) * | 2016-10-26 | 2017-03-29 | 陈汝霖 | A kind of condom electric-examination instrument |
CN107176118A (en) * | 2017-05-22 | 2017-09-19 | 芜湖博康机电有限公司 | A kind of vehicle switch assembly acted on anti-electric current counterattack |
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CN107176118A (en) * | 2017-05-22 | 2017-09-19 | 芜湖博康机电有限公司 | A kind of vehicle switch assembly acted on anti-electric current counterattack |
CN114655682A (en) * | 2021-11-30 | 2022-06-24 | 国网江苏省电力有限公司盐城供电分公司 | Transformer core feeding and assembly structure |
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