CN105449655B - A kind of Current Transformer Secondary open-circuit-protection method and device - Google Patents
A kind of Current Transformer Secondary open-circuit-protection method and device Download PDFInfo
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- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 2
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- 238000012544 monitoring process Methods 0.000 description 4
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- 238000013024 troubleshooting Methods 0.000 description 3
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Abstract
本发明公开了一种电流互感器二次开路保护方法及装置，所述方法是监测电流互感器二次侧回路电压，当二次侧开路，电压会变得很大，将电流互感器二次侧回路短接起来，并提醒工作人员设备损害，该装置包括外壳、驱动机构、传动机构和短接机构，所述驱动机构由继电器、电动伸缩杆和连接插头组成，所述连接插头将所述继电器连接到电流互感器二次侧，所述继电器与电动伸缩杆连接，所述驱动机构包括底座，所述底座通过支架设置传动杆，所述短接机构包括铜板，所述铜板下方设置插头，所述铜板用绝缘材料包裹。本发明运用了继电器控制电路的技术，当电压变化时，继电器启动伸缩杆推动传动杆将短接插头插入二次侧回路端子，将二次侧回路短接。
The invention discloses a secondary open-circuit protection method and device for a current transformer. The method monitors the secondary side circuit voltage of the current transformer. When the secondary side is open, the voltage becomes very large, and the secondary The side circuit is short-circuited and reminds the staff of equipment damage. The device includes a casing, a drive mechanism, a transmission mechanism and a short-circuit mechanism. The drive mechanism is composed of a relay, an electric telescopic rod and a connecting plug. The connecting plug connects the The relay is connected to the secondary side of the current transformer, the relay is connected to the electric telescopic rod, the driving mechanism includes a base, the base is provided with a transmission rod through a bracket, the shorting mechanism includes a copper plate, and a plug is arranged under the copper plate, The copper plate is wrapped with insulating material. The invention uses the technology of the relay control circuit. When the voltage changes, the relay activates the telescopic rod to push the transmission rod to insert the short-circuit plug into the secondary side circuit terminal to short-circuit the secondary side circuit.
Description
技术领域technical field
本发明涉及电流互感器开路保护技术领域，具体涉及一种电流互感器二次开路保护方法及装置。The invention relates to the technical field of current transformer open-circuit protection, in particular to a method and device for secondary open-circuit protection of a current transformer.
背景技术Background technique
在变电站里，变电站用高电压电流互感器其二次回路严禁开路，一旦二次断线或者接触不好造成开路，将根据变比及负荷情况在断线处产生高电压，可高达上万伏，会造成二次绝缘击穿，烧坏二次线、端子排，甚至会烧坏电流互感器或者造成人生伤害；因此，能有效防止电流互感器二次回路开路且安装方便可靠的开路保护装置很有必要。而现有的保护装置多为采用具有非线性电阻特性的金属氧化物器件、放电管和空气间隙等装置组成的设备来防止过电压进行保护，但其存在着通流容量小，若电流互感器长时间开路，很有可能会被损坏；采用间隙保护，因为二次过电压的作用，会使间隙两端产生间歇性电弧，极为容易烧毁设备。公开号为102709901A的发明公开了一种电流互感器过压保护方法和装置，所述方法是采集电流互感器二次侧的电流信号；将采集到的电流信号转换为电压信号与预先设定的保护值进行对比，判断所述电流互感器二次侧是否为开路；当转换后的电压信号大于所述预先设定的保护值时，短接所述电流互感器二次回路，当转换后的电压信号不大于所述预先设定的保护值时，恢复所述电流互感器的正常连接状态；所述装置包括采样单元、主控单元、限压保护电路和开路保护动作元件，所述开路保护动作元件的输出端子连接于所述电流互感器的输出端子之间，该发明采用智能方式进行控制，同时采用机械开关完成开路保护，避免了现有技术下电子元器件的发热对整个电路造成的影响。公开号为103762557A的发明公开了一种电流互感器的防开路保护器及其方法，涉及涉及一种电器元件的附属装置，特别是属于一种电流互感器的防开路保护装置。其特征在于，包括检测装置、通讯模块、控制装置、开路保护模块和电源模块，所述的通讯模块具有延时装置和通讯装置；且分别通过延时芯片和北斗芯片实现，其中，延时芯片连接电源选择开关和北斗芯片，北斗芯片连接天线模块。其方法包括如下步骤：准备工作、供电和通讯功能检测、被保护电流互感器二次回路电流检测、开路保护和通讯、故障排除后的保护回路检测。该发明具有故障检测及时迅速、有效保护电流互感器、安全可靠的积极效果。但两个发明都是结构复杂，操作麻烦，不利于推广。In the substation, the secondary circuit of the high-voltage current transformer used in the substation is strictly prohibited from being open. Once the secondary circuit is disconnected or the contact is not good, a high voltage will be generated at the disconnection according to the transformation ratio and load conditions, which can be as high as tens of thousands of volts. , will cause secondary insulation breakdown, burn out the secondary line, terminal block, and even burn out the current transformer or cause personal injury; therefore, it can effectively prevent the open circuit of the secondary circuit of the current transformer and is an open circuit protection device that is easy to install and reliable necessary. Most of the existing protection devices are composed of metal oxide devices with non-linear resistance characteristics, discharge tubes and air gaps to prevent overvoltage for protection, but they have a small current capacity. If the current transformer If the circuit is open for a long time, it is likely to be damaged; if the gap protection is used, because of the secondary overvoltage, intermittent arcs will be generated at both ends of the gap, which is extremely easy to burn the equipment. The invention with the publication number of 102709901A discloses a current transformer overvoltage protection method and device, the method is to collect the current signal on the secondary side of the current transformer; convert the collected current signal into a voltage signal and a preset The protection value is compared to judge whether the secondary side of the current transformer is an open circuit; when the converted voltage signal is greater than the preset protection value, the secondary circuit of the current transformer is short-circuited, and when the converted When the voltage signal is not greater than the preset protection value, the normal connection state of the current transformer is restored; the device includes a sampling unit, a main control unit, a voltage limiting protection circuit and an open circuit protection action element, and the open circuit protection The output terminal of the action element is connected between the output terminals of the current transformer. The invention uses an intelligent method for control, and at the same time uses a mechanical switch to complete the open circuit protection, which avoids the damage caused by the heating of the electronic components in the prior art to the entire circuit. influences. The invention with the publication number of 103762557A discloses an anti-open circuit protector for a current transformer and its method, relates to an accessory device of an electrical component, and in particular belongs to an anti-open circuit protection device for a current transformer. It is characterized in that it includes a detection device, a communication module, a control device, an open circuit protection module and a power module, and the communication module has a delay device and a communication device; and is respectively implemented by a delay chip and a Beidou chip, wherein the delay chip Connect the power selection switch and the Beidou chip, and the Beidou chip is connected to the antenna module. The method comprises the following steps: preparatory work, power supply and communication function detection, secondary circuit current detection of the protected current transformer, open circuit protection and communication, protection circuit detection after troubleshooting. The invention has the positive effects of timely and rapid fault detection, effective protection of current transformers, and safety and reliability. But both inventions are all complicated in structure, troublesome to operate, are unfavorable for promotion.
发明内容Contents of the invention
本发明所要解决的问题是提供一种结构简单、反应较快的电流互感器二次开路保护方法及装置。The problem to be solved by the present invention is to provide a secondary open-circuit protection method and device for a current transformer with simple structure and fast response.
一种电流互感器二次开路保护方法，通过电流互感器二次开路保护装置对电流互感器二次侧回路电压进行实时监测，当该电压稳定或者短暂波动，视为正常，当电流互感器二次侧回路电压升高并延时过长，则通过电流互感器二次开路保护装置短接电流互感器二次侧端子。A secondary open-circuit protection method for a current transformer, which monitors the secondary side circuit voltage of the current transformer in real time through the secondary open-circuit protection device of the current transformer. When the voltage is stable or fluctuates briefly, it is considered normal. If the voltage of the secondary side circuit rises and the delay is too long, the secondary side terminals of the current transformer are shorted by the secondary open circuit protection device of the current transformer.
所述的电压短暂波动指电压大小不超过安全电压5秒，所述电压升高并延时过长指电压大小超过安全电压5秒。The short-term voltage fluctuation means that the voltage does not exceed the safe voltage for 5 seconds, and the voltage rises and delays for too long means that the voltage exceeds the safe voltage for 5 seconds.
所述电流互感器二次开路保护装置通过声音报警器和报警灯提醒周边工作人员设备出现故障，所述电流互感器二次开路保护装置通过信号发射器提醒监控中心工作人员设备出现故障，所述电流互感器二次开路保护装置通过复位按钮解除装置对电流互感器二次侧的短接状态。The secondary open-circuit protection device of the current transformer reminds the surrounding staff that the equipment fails through the sound alarm and the alarm light, and the secondary open-circuit protection device of the current transformer reminds the staff of the monitoring center that the equipment fails through the signal transmitter. The secondary open circuit protection device of the current transformer releases the short circuit state of the device to the secondary side of the current transformer through the reset button.
一种电流互感器二次开路保护装置，包括外壳、驱动机构、传动机构和短接机构，所述驱动机构由继电器、电动伸缩杆和连接插头组成，所述连接插头将所述继电器连接到电流互感器二次侧，所述继电器与电动伸缩杆连接，所述驱动机构包括底座，所述底座通过支架设置传动杆，所述传动杆一端与电动伸缩杆连接，所述传动杆另一端与所述短接机构连接，所述短接机构包括铜板，所述铜板下方设置插头，所述铜板用绝缘材料包裹。A secondary open-circuit protection device for a current transformer, comprising a casing, a driving mechanism, a transmission mechanism and a short-circuit mechanism, the driving mechanism is composed of a relay, an electric telescopic rod and a connecting plug, and the connecting plug connects the relay to the current On the secondary side of the transformer, the relay is connected to the electric telescopic rod, the driving mechanism includes a base, the base is provided with a transmission rod through a bracket, one end of the transmission rod is connected to the electric telescopic rod, and the other end of the transmission rod is connected to the The short-circuit mechanism is connected, and the short-circuit mechanism includes a copper plate, a plug is arranged under the copper plate, and the copper plate is wrapped with an insulating material.
所述继电器为中间继电器。The relay is an intermediate relay.
所述外壳下方设置声音报警器。A sound alarm is arranged below the shell.
所述外壳下方设置三个报警灯。Three warning lamps are arranged below the shell.
所述外壳上方设置信号发射器。A signal transmitter is arranged above the casing.
所述插头为六个插头，与端子排的端子插孔对应配合。The plugs are six plugs correspondingly matched with the terminal jacks of the terminal row.
所述外壳下方设置复位按钮，所述复位按钮与所述电动伸缩杆连接。A reset button is arranged under the shell, and the reset button is connected with the electric telescopic rod.
本发明的有益效果是：本发明的保护方法，通过电流互感器二次开路保护装置对电流互感器二次侧回路电压进行实时监测，当该电压稳定或者短暂波动，视为正常，当电流互感器二次侧回路电压升高并延时过长，则通过电流互感器二次开路保护装置短接电流互感器二次侧端子。所述的电压短暂波动指电压大小不超过安全电压5秒，所述电压升高并延时过长指电压大小超过安全电压5秒。电流互感器不为开路时，二次侧电压一般很小在几十伏一下，一旦二次侧开路，因为磁动势原因电压会变得很大，所以将电流互感器二次侧端口短接即可取消二次侧开路，起到保护电路和电流互感器的作用，通知工作人员设备损坏，及时维护修理，排除故障后可手动复位，确保了维修工作的及时性和安全性。采用一个继电器控制，设备简单，不需要复杂的接线，继电器设置一个较小的值，采取延时监测可以防止二次侧电流波动而引起装置开启，短接二次侧端口，只有电压升高，且维持一定时间不下降，才会启动继电器，保护开路的二次侧电路。The beneficial effects of the present invention are: the protection method of the present invention monitors the secondary side circuit voltage of the current transformer in real time through the secondary open circuit protection device of the current transformer. When the voltage is stable or temporarily fluctuates, it is regarded as normal. If the secondary side circuit voltage of the transformer rises and the delay is too long, the secondary side terminal of the current transformer is shorted through the secondary open circuit protection device of the current transformer. The short-term voltage fluctuation means that the voltage does not exceed the safe voltage for 5 seconds, and the voltage rises and delays for too long means that the voltage exceeds the safe voltage for 5 seconds. When the current transformer is not open circuit, the voltage on the secondary side is generally small at tens of volts. Once the secondary side is open circuited, the voltage will become very large due to the magnetomotive force, so the secondary side port of the current transformer is shorted. It can cancel the open circuit of the secondary side, protect the circuit and current transformer, notify the staff of equipment damage, timely maintain and repair, and manually reset after troubleshooting, ensuring the timeliness and safety of maintenance work. Using a relay control, the equipment is simple and does not require complicated wiring. The relay is set to a small value, and the delay monitoring can prevent the secondary side current fluctuation from causing the device to open. Short the secondary side port, only the voltage rises. And maintain a certain period of time without falling, the relay will be activated to protect the open secondary side circuit.
所述电流互感器二次开路保护装置通过声音报警器和报警灯提醒周边工作人员设备出现故障，所述电流互感器二次开路保护装置通过信号发射器提醒监控中心工作人员设备出现故障，所述电流互感器二次开路保护装置通过复位按钮解除装置对电流互感器二次侧的短接状态。能够及时提醒工作人员设备出现故障，可以快速对设备进行维修，故障排除后，可一键将二次侧的短路接触，是设备进行正常运行。The secondary open-circuit protection device of the current transformer reminds the surrounding staff that the equipment fails through the sound alarm and the alarm light, and the secondary open-circuit protection device of the current transformer reminds the staff of the monitoring center that the equipment fails through the signal transmitter. The secondary open circuit protection device of the current transformer releases the short circuit state of the device to the secondary side of the current transformer through the reset button. It can remind the staff of equipment failure in time, and can quickly repair the equipment. After the fault is eliminated, the short circuit of the secondary side can be contacted with one button, so that the equipment can operate normally.
本发明装置包括外壳、驱动机构、传动机构和短接机构，所述驱动机构由继电器、电动伸缩杆和连接插头组成，所述连接插头将所述继电器连接到电流互感器二次侧，所述继电器与电动伸缩杆连接，所述驱动机构包括底座，所述底座通过支架设置传动杆，所述传动杆一端与电动伸缩杆连接，所述传动杆另一端与所述短接机构连接，所述短接机构包括铜板，所述铜板下方设置插头，所述铜板用绝缘材料包裹。连接插头接到电流互感器二次侧与继电器一起时刻监控电压的变化，一旦发生二次侧短路，继电器便启动电动伸缩杆，利用杠杆原理，将传动杆一侧顶起，支架设置在传动杆中间，则传动杆另一侧的短接插头便会向下插入端子排的端子插孔内，将电流互感器二次侧短接起来，对二次侧开路起到了保护作用。The device of the present invention includes a casing, a driving mechanism, a transmission mechanism and a short-circuit mechanism. The driving mechanism is composed of a relay, an electric telescopic rod and a connecting plug, and the connecting plug connects the relay to the secondary side of the current transformer. The relay is connected with the electric telescopic rod, the driving mechanism includes a base, the base is provided with a transmission rod through a bracket, one end of the transmission rod is connected with the electric telescopic rod, the other end of the transmission rod is connected with the short-circuit mechanism, and the The short-circuit mechanism includes a copper plate, a plug is arranged under the copper plate, and the copper plate is wrapped with an insulating material. The connecting plug is connected to the secondary side of the current transformer and the relay monitors the voltage change at all times. Once a short circuit occurs on the secondary side, the relay will activate the electric telescopic rod. Using the principle of leverage, one side of the transmission rod is lifted up, and the bracket is set on the transmission rod. In the middle, the short-circuit plug on the other side of the transmission rod will be inserted downward into the terminal jack of the terminal block, and the secondary side of the current transformer will be short-circuited to protect the secondary side from being open.
所述继电器为中间继电器。中间继电器具有防潮、防尘、功耗小、温升低等优点，且拥有较大的触点数量和触电容量，自带精度较高的延时装置，满足本发明的需求，无需在外接延时电路，就能做到精确判断二次侧电路是否开路的问题。The relay is an intermediate relay. The intermediate relay has the advantages of moisture-proof, dust-proof, low power consumption, low temperature rise, etc., and has a large number of contacts and electric shock capacity, and has a high-precision delay device to meet the needs of the present invention. When the circuit is used, it can accurately determine whether the secondary side circuit is open.
所述外壳下方设置声音报警器。当二次侧开路时，声音报警器动作可以提醒周边的工作人员注意，避免了危险的发生，且能让工作人员较快反应，投入到维修当中。A sound alarm is arranged below the shell. When the secondary side is open, the sound alarm can remind the surrounding staff to pay attention, avoid danger, and allow the staff to respond quickly and invest in maintenance.
所述外壳下方设置三个报警指示灯。三个报警指示灯分别反映电路互感器二次侧的三条回路，不同的回路开路，对应的报警指示灯便会亮起，对工作人员的维修提供了帮助，使得检修工作更加容易完成。Three warning indicator lights are arranged below the shell. The three alarm indicator lights respectively reflect the three circuits on the secondary side of the circuit transformer. If different circuits are open, the corresponding alarm indicator lights will light up, which provides assistance to the maintenance staff and makes the maintenance work easier to complete.
所述外壳上方设置信号发射器。倘若保护装置以及监测设备周边没有工作人员在场，那么开路之后可能不会被快速发现，那么故障就不能被快速排除，信号发射器可以在继电器动作以后将发生开路的信号发射到监控中心，提醒工作人员二次侧开路，提高了工作的效率性。A signal transmitter is arranged above the casing. If there is no staff present around the protection device and monitoring equipment, the open circuit may not be quickly discovered, and the fault cannot be quickly eliminated. The signal transmitter can transmit the signal of the open circuit to the monitoring center after the relay operates to remind the work The secondary side of the personnel is open, which improves the efficiency of work.
所述插头为六个插头，与端子排的端子插孔对应配合。六个插头可将电流互感器二次侧六个端口全部短接，解决二次侧开路的问题，避免了电压过大烧毁二次回路设备以及电流互感器。The plugs are six plugs correspondingly matched with the terminal jacks of the terminal row. The six plugs can short-circuit all the six ports on the secondary side of the current transformer, solving the problem of open circuit on the secondary side, and avoiding the burning of the secondary circuit equipment and the current transformer due to excessive voltage.
所述外壳下方设置复位按钮，所述复位按钮与所述电动伸缩杆连接。本装置在工作人员排除故障以后无法自动复位，添加一个复位按钮，与电动伸缩杆连接，设备正常后按下复位按钮，伸缩杆缩回，带动铜板上的插头离开端子排的端子插孔，使得二次侧回路设备可以正常工作。本发明设备简单，操作简单，对二次侧开路判断精准，迅速保护，能有效解决电流互感器二次侧开路引起的各种事故。A reset button is arranged under the shell, and the reset button is connected with the electric telescopic rod. This device cannot be reset automatically after the staff eliminates the fault. Add a reset button and connect it to the electric telescopic rod. The secondary side circuit equipment can work normally. The invention has simple equipment, simple operation, accurate judgment on the open circuit of the secondary side, rapid protection, and can effectively solve various accidents caused by the open circuit of the secondary side of the current transformer.
附图说明Description of drawings
下面结合附图对本发明作进一步描述：The present invention will be further described below in conjunction with accompanying drawing:
图1是本发明电流互感器二次开路保护装置的结构示意图。Fig. 1 is a schematic structural diagram of a secondary open-circuit protection device for a current transformer of the present invention.
图2是本发明装置内部的结构示意图。Fig. 2 is a schematic diagram of the internal structure of the device of the present invention.
具体实施方式Detailed ways
实施例一Embodiment one
如图1和图2所示：本发明的保护方法，通过电流互感器二次开路保护装置对电流互感器二次侧回路电压进行实时监测，当该电压稳定或者短暂波动，视为正常，当电流互感器二次侧回路电压升高并延时过长，则通过电流互感器二次开路保护装置短接电流互感器二次侧端子。所述的电压短暂波动为电压大小不超过安全电压5秒，所述电压升高并延时过长为电压大小超过安全电压5秒。电流互感器不为开路时，二次侧电压一般很小在几十伏一下，一旦二次侧开路，因为磁动势原因电压会变得很大，所以将电流互感器二次侧端口短接即可取消二次侧开路，起到保护电路和电流互感器的作用，通知工作人员设备损坏，及时维护修理，排除故障后可手动复位，确保了维修工作的及时性和安全性。采用一个继电器控制，设备简单，不需要复杂的接线，继电器设置一个较小的值，采取延时监测可以防止二次侧电流波动而引起装置开启，短接二次侧端口，只有电压升高，且维持一定时间不下降，才会启动继电器，保护开路的二次侧电路。所述电流互感器二次开路保护装置通过声音报警器和报警灯提醒周边工作人员设备出现故障，所述电流互感器二次开路保护装置通过信号发射器提醒监控中心工作人员设备出现故障，所述电流互感器二次开路保护装置通过复位按钮解除装置对电流互感器二次侧的短接状态。能够及时提醒工作人员设备出现故障，可以快速对设备进行维修，故障排除后，可一键将二次侧的短路接触，是设备进行正常运行。本发明还提供了一种基于上述方法的电流互感器二次开路保护装置，包括外壳9、驱动机构、传动机构和短接机构，所述驱动机构由继电器2、电动伸缩杆12和连接插头8组成，所述连接插头8将所述继电器2连接到电流互感器二次侧，所述继电器2与电动伸缩杆12连接，所述驱动机构包括底座2，所述底座2通过支架11设置传动杆3，所述传动杆3一端与电动伸缩杆12连接，所述传动杆3另一端与所述短接机构连接，所述短接机构包括铜板1，所述铜板1下方设置插头13，所述铜板1用绝缘材料包裹。连接插头8接到电流互感器二次侧与继电器4一起时刻监控电压的变化，一旦发生二次侧短路，继电器4便启动电动伸缩杆12，利用杠杆原理，将传动杆3一侧顶起，支架11设置在传动杆3中间，则传动杆3另一侧的短接插头便会向下插入端子排15的端子插孔14内，将电流互感器二次侧短接起来，对二次侧开路起到了保护作用。 所述继电器4为中间继电器。中间继电器具有防潮、防尘、功耗小、温升低等优点，且拥有较大的触点数量和触电容量，自带精度较高的延时装置，满足本发明的需求，无需在外接延时电路，就能做到精确判断二次侧电路是否开路的问题。所述外壳9下方设置声音报警器5。当二次侧开路时，声音报警器5动作可以提醒周边的工作人员注意，避免了危险的发生，且能让工作人员较快反应，投入到维修当中。所述插头13为六个插头，与端子排15的端子插孔14对应配合。六个插头可将电流互感器二次侧六个端口全部短接，解决二次侧开路的问题，避免了电压过大烧毁二次回路设备以及电流互感器。As shown in Figures 1 and 2: the protection method of the present invention monitors the secondary side circuit voltage of the current transformer in real time through the secondary open circuit protection device of the current transformer. When the voltage is stable or fluctuates briefly, it is considered normal. If the voltage of the secondary side circuit of the current transformer rises and the delay is too long, the secondary side terminals of the current transformer are shorted by the secondary open circuit protection device of the current transformer. The brief fluctuation of the voltage means that the voltage does not exceed the safe voltage for 5 seconds, and the voltage rises and delays too long means that the voltage exceeds the safe voltage for 5 seconds. When the current transformer is not open circuit, the voltage on the secondary side is generally small at tens of volts. Once the secondary side is open circuited, the voltage will become very large due to the magnetomotive force, so the secondary side port of the current transformer is shorted. It can cancel the open circuit of the secondary side, protect the circuit and current transformer, notify the staff of equipment damage, timely maintain and repair, and manually reset after troubleshooting, ensuring the timeliness and safety of maintenance work. Using a relay control, the equipment is simple and does not require complicated wiring. The relay is set to a small value, and the delay monitoring can prevent the secondary side current fluctuation from causing the device to open. Short the secondary side port, only the voltage rises. And maintain a certain period of time without falling, the relay will be activated to protect the open secondary side circuit. The secondary open-circuit protection device of the current transformer reminds the surrounding staff that the equipment fails through the sound alarm and the alarm light, and the secondary open-circuit protection device of the current transformer reminds the staff of the monitoring center that the equipment fails through the signal transmitter. The secondary open circuit protection device of the current transformer releases the short circuit state of the device to the secondary side of the current transformer through the reset button. It can remind the staff of equipment failure in time, and can quickly repair the equipment. After the fault is eliminated, the short circuit of the secondary side can be contacted with one button, so that the equipment can operate normally. The present invention also provides a secondary open-circuit protection device for current transformers based on the above method, including a housing 9, a drive mechanism, a transmission mechanism and a short-circuit mechanism. The drive mechanism consists of a relay 2, an electric telescopic rod 12 and a connecting plug 8 Composition, the connecting plug 8 connects the relay 2 to the secondary side of the current transformer, the relay 2 is connected to the electric telescopic rod 12, the driving mechanism includes a base 2, and the base 2 is provided with a transmission rod through a bracket 11 3. One end of the transmission rod 3 is connected to the electric telescopic rod 12, and the other end of the transmission rod 3 is connected to the short-circuit mechanism. The short-circuit mechanism includes a copper plate 1, and a plug 13 is arranged under the copper plate 1. The copper plate 1 is wrapped with insulating material. The connecting plug 8 is connected to the secondary side of the current transformer and the relay 4 monitors the change of the voltage at all times. Once a short circuit occurs on the secondary side, the relay 4 will activate the electric telescopic rod 12, and use the principle of leverage to lift up one side of the transmission rod 3. The bracket 11 is set in the middle of the transmission rod 3, then the shorting plug on the other side of the transmission rod 3 will be inserted downward into the terminal jack 14 of the terminal block 15, and the secondary side of the current transformer will be short-circuited. The open circuit acts as a protection. The relay 4 is an intermediate relay. The intermediate relay has the advantages of moisture-proof, dust-proof, low power consumption, low temperature rise, etc., and has a large number of contacts and electric shock capacity, and has a high-precision delay device to meet the needs of the present invention. When the circuit is used, it can accurately determine whether the secondary side circuit is open. A sound alarm 5 is arranged below the shell 9 . When the secondary side is open, the action of the sound alarm 5 can remind the surrounding staff to pay attention, avoid danger, and allow the staff to respond quickly and put it into maintenance. The plugs 13 are six plugs corresponding to the terminal sockets 14 of the terminal row 15 . The six plugs can short-circuit all the six ports on the secondary side of the current transformer, solving the problem of open circuit on the secondary side, and avoiding the burning of the secondary circuit equipment and the current transformer due to excessive voltage.
实施例二Embodiment two
如图1和图2所示：本发明还提供了一种基于上述方法的电流互感器二次开路保护装置，包括外壳9、驱动机构、传动机构和短接机构，所述驱动机构由继电器2、电动伸缩杆12和连接插头8组成，所述连接插头8将所述继电器2连接到电流互感器二次侧，所述继电器2与电动伸缩杆12连接，所述驱动机构包括底座2，所述底座2通过支架11设置传动杆3，所述传动杆3一端与电动伸缩杆12连接，所述传动杆3另一端与所述短接机构连接，所述短接机构包括铜板1，所述铜板1下方设置插头13，所述铜板1用绝缘材料包裹。连接插头8接到电流互感器二次侧与继电器4一起时刻监控电压的变化，一旦发生二次侧短路，继电器4便启动电动伸缩杆12，利用杠杆原理，将传动杆3一侧顶起，支架11设置在传动杆3中间，则传动杆3另一侧的短接插头便会向下插入端子排15的端子插孔14内，将电流互感器二次侧短接起来，对二次侧开路起到了保护作用。所述外壳9下方设置三个报警指示灯7。三个报警指示灯7分别反映电路互感器二次侧的三条回路，不同的回路开路，对应的报警指示灯7便会亮起，对工作人员的维修提供了帮助，使得检修工作更加容易完成。所述插头13为六个插头，与端子排15的端子插孔14一一相对。六个插头可将电流互感器二次侧六个端口全部短接，解决二次侧开路的问题，避免了电压过大烧毁二次回路设备以及电流互感器。As shown in Fig. 1 and Fig. 2: the present invention also provides a kind of current transformer secondary open circuit protection device based on above-mentioned method, comprises shell 9, driving mechanism, transmission mechanism and short-circuiting mechanism, and described driving mechanism is controlled by relay 2 , an electric telescopic rod 12 and a connecting plug 8, the connecting plug 8 connects the relay 2 to the secondary side of the current transformer, the relay 2 is connected to the electric telescopic rod 12, the driving mechanism includes a base 2, the The base 2 is provided with a transmission rod 3 through a bracket 11, one end of the transmission rod 3 is connected with the electric telescopic rod 12, and the other end of the transmission rod 3 is connected with the short-circuit mechanism, the short-circuit mechanism includes a copper plate 1, the A plug 13 is arranged under the copper plate 1, and the copper plate 1 is wrapped with an insulating material. The connecting plug 8 is connected to the secondary side of the current transformer and the relay 4 monitors the change of the voltage at all times. Once a short circuit occurs on the secondary side, the relay 4 will activate the electric telescopic rod 12, and use the principle of leverage to lift up one side of the transmission rod 3. The bracket 11 is set in the middle of the transmission rod 3, then the shorting plug on the other side of the transmission rod 3 will be inserted downward into the terminal jack 14 of the terminal block 15, and the secondary side of the current transformer will be short-circuited. The open circuit acts as a protection. Three warning indicator lights 7 are arranged below the shell 9 . The three alarm indicator lights 7 respectively reflect the three circuits on the secondary side of the circuit transformer. If different circuits are open, the corresponding alarm indicator lights 7 will light up, which helps the maintenance of the staff and makes the maintenance work easier to complete. The plugs 13 are six plugs, which are opposite to the terminal sockets 14 of the terminal row 15 one by one. The six plugs can short-circuit all the six ports on the secondary side of the current transformer, solving the problem of open circuit on the secondary side, and avoiding the burning of the secondary circuit equipment and the current transformer due to excessive voltage.
实施例三Embodiment three
如图1和图2所示：本发明还提供了一种基于上述方法的电流互感器二次开路保护装置，包括外壳9、驱动机构、传动机构和短接机构，所述驱动机构由继电器2、电动伸缩杆12和连接插头8组成，所述连接插头8将所述继电器2连接到电流互感器二次侧，所述继电器2与电动伸缩杆12连接，所述驱动机构包括底座2，所述底座2通过支架11设置传动杆3，所述传动杆3一端与电动伸缩杆12连接，所述传动杆3另一端与所述短接机构连接，所述短接机构包括铜板1，所述铜板1下方设置插头13，所述铜板1用绝缘材料包裹。连接插头8接到电流互感器二次侧与继电器4一起时刻监控电压的变化，一旦发生二次侧短路，继电器4便启动电动伸缩杆12，利用杠杆原理，将传动杆3一侧顶起，支架11设置在传动杆3中间，则传动杆3另一侧的短接插头便会向下插入端子排15的端子插孔14内，将电流互感器二次侧短接起来，对二次侧开路起到了保护作用。所述外壳9上方设置信号发射器10。倘若保护装置以及监测设备周边没有工作人员在场，那么开路之后可能不会被快速发现，那么故障就不能被快速排除，信号发射器10可以在继电器4动作以后将发生开路的信号发射到监控中心，提醒工作人员二次侧开路，提高了工作的效率性。所述插头13为六个插头，与端子排15的端子插孔14对应配合。六个插头可将电流互感器二次侧六个端口全部短接，解决二次侧开路的问题，避免了电压过大烧毁二次回路设备以及电流互感器。所述外壳9下方设置复位按钮6，所述复位按钮6与所述电动伸缩杆12连接。本装置在工作人员排除故障以后无法自动复位，添加一个复位按钮6，与电动伸缩杆12连接，设备正常后按下复位按钮6，伸缩杆缩回，带动铜板1上的插头13离开端子排15的端子插孔14，使得二次侧回路设备可以正常工作。As shown in Fig. 1 and Fig. 2: the present invention also provides a kind of current transformer secondary open circuit protection device based on above-mentioned method, comprises shell 9, driving mechanism, transmission mechanism and short-circuiting mechanism, and described driving mechanism is controlled by relay 2 , an electric telescopic rod 12 and a connecting plug 8, the connecting plug 8 connects the relay 2 to the secondary side of the current transformer, the relay 2 is connected to the electric telescopic rod 12, the driving mechanism includes a base 2, the The base 2 is provided with a transmission rod 3 through a bracket 11, one end of the transmission rod 3 is connected with the electric telescopic rod 12, and the other end of the transmission rod 3 is connected with the short-circuit mechanism, the short-circuit mechanism includes a copper plate 1, the A plug 13 is arranged under the copper plate 1, and the copper plate 1 is wrapped with an insulating material. The connecting plug 8 is connected to the secondary side of the current transformer and the relay 4 monitors the change of the voltage at all times. Once a short circuit occurs on the secondary side, the relay 4 will activate the electric telescopic rod 12, and use the principle of leverage to lift up one side of the transmission rod 3. The bracket 11 is set in the middle of the transmission rod 3, then the shorting plug on the other side of the transmission rod 3 will be inserted downward into the terminal jack 14 of the terminal block 15, and the secondary side of the current transformer will be short-circuited. The open circuit acts as a protection. A signal transmitter 10 is arranged above the casing 9 . If there is no staff present around the protection device and the monitoring equipment, then the open circuit may not be quickly discovered, and the fault cannot be quickly eliminated. The signal transmitter 10 can transmit the signal of the open circuit to the monitoring center after the relay 4 is activated. Remind the staff that the secondary side is open, which improves the efficiency of work. The plugs 13 are six plugs corresponding to the terminal sockets 14 of the terminal row 15 . The six plugs can short-circuit all the six ports on the secondary side of the current transformer, solving the problem of open circuit on the secondary side, and avoiding the burning of the secondary circuit equipment and the current transformer due to excessive voltage. A reset button 6 is arranged below the housing 9 , and the reset button 6 is connected to the electric telescopic rod 12 . This device cannot be automatically reset after the staff eliminates the fault. Add a reset button 6 to connect with the electric telescopic rod 12. After the device is normal, press the reset button 6, and the telescopic rod retracts, driving the plug 13 on the copper plate 1 to leave the terminal block 15 The terminal jack 14, so that the secondary side circuit equipment can work normally.
Claims (8)
- A kind of 1. Current Transformer Secondary open-circuit-protection method, it is characterised in that：It is filled by Current Transformer Secondary open-circuit-protection Put and Current Transformer Secondary side loop voltage monitored in real time, when the voltage stabilization or brief fluctuations, be considered as it is normal, when Current Transformer Secondary side loop voltage raise and be delayed it is long, then pass through second open circuit protector of current mutual inductor short circuit electricity The secondary side terminal of current transformer；The second open circuit protector of current mutual inductor includes shell, driving mechanism, transmission mechanism and short circuit mechanism, the drive Motivation structure is made of relay, electric telescopic rod and connection plug, and it is mutual that the relay is connected to electric current by the connection plug Sensor secondary side, the relay are connected with electric telescopic rod, and the driving mechanism includes pedestal, and the pedestal is set up by branch Drive link is put, described drive link one end is connected with electric telescopic rod, and the drive link other end is connected with the short circuit mechanism, institute Stating short circuit mechanism includes copper coin, and plug, the copper coin wrapped with insulation are set below the copper coin；The voltage brief fluctuations refer to voltage swing and are no more than safe voltage 5 seconds, and the voltage raises and the long finger electricity that is delayed Size is pressed to be more than safe voltage 5 seconds.
- 2. Current Transformer Secondary open-circuit-protection method as described in claim 1, it is characterised in that：The current transformer two Secondary open-circuit protecting device reminds periphery staff's equipment to break down by voice guard and alarm lamp, the Current Mutual Inductance Device second open circuit protector reminds monitoring center staff equipment to break down by signal projector, the Current Mutual Inductance Device second open circuit protector releases short circuit state of the device to Current Transformer Secondary side by reset button.
- 3. Current Transformer Secondary open-circuit-protection method as described in claim 1, it is characterised in that：The relay is centre Relay.
- 4. Current Transformer Secondary open-circuit-protection method as described in claim 1, it is characterised in that：It is set below the shell Voice guard.
- 5. Current Transformer Secondary open-circuit-protection method as described in claim 1, it is characterised in that：It is set below the shell Three alarm lamps.
- 6. Current Transformer Secondary open-circuit-protection method as described in claim 1, it is characterised in that：It is set above the shell Signal projector.
- 7. Current Transformer Secondary open-circuit-protection method as described in claim 1, it is characterised in that：The plug is inserted for six Head, the terminal jacks corresponding matching with terminal block.
- 8. Current Transformer Secondary open-circuit-protection method as described in claim 1, it is characterised in that：It is set below the shell Reset button, the reset button are connected with the electric telescopic rod.
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| CN103956714A (en) * | 2014-04-24 | 2014-07-30 | 合肥沃华电气技术有限公司 | High-sensitivity multifunctional CT open circuit protection device |
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| CN105449655A (en) | 2016-03-30 |
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