CN104009460A - Lighting protection device for power transmission line monitoring system - Google Patents
Lighting protection device for power transmission line monitoring system Download PDFInfo
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Abstract
本发明公开了输电线路监测系统的防雷设备，包括直流电正向传输线、直流电负向传输线、初级防护电路及次级防护电路，初级防护电路包括第一压敏电阻、第二压敏电阻、第三压敏电阻及多个并联的气体放电管，第二压敏电阻与第三压敏电阻构成的串联支路两端及第一压敏电阻两端均分别与直流电正向传输线和直流电负向传输线连接，初级防护电路中多个并联的气体放电管构成的并联支路一端连接在第二压敏电阻与第三压敏电阻之间的线路上，其另一端接地。次级防护电路包括第四压敏电阻、瞬态电压抑制二极管及多个并联的气体放电管。本发明能通过初级防护电路泄放掉大部分的雷电流，再通过次级防护电路进一步降低残压以保护输电线路监测系统。
The invention discloses lightning protection equipment for a power transmission line monitoring system, which includes a direct current positive transmission line, a direct current negative transmission line, a primary protection circuit and a secondary protection circuit. The primary protection circuit includes a first varistor, a second varistor, and a second varistor. Three piezoresistors and a plurality of gas discharge tubes connected in parallel, the two ends of the series branch formed by the second piezoresistor and the third piezoresistor and the two ends of the first piezoresistor are respectively connected to the DC positive transmission line and the DC negative The transmission line is connected, and one end of the parallel branch composed of multiple parallel gas discharge tubes in the primary protection circuit is connected to the line between the second varistor and the third varistor, and the other end is grounded. The secondary protection circuit includes a fourth varistor, a transient voltage suppression diode and a plurality of gas discharge tubes connected in parallel. The invention can discharge most of the lightning current through the primary protection circuit, and then further reduce the residual voltage through the secondary protection circuit to protect the transmission line monitoring system.
Description
技术领域 technical field
本发明涉及电力设备维护领域，具体是输电线路监测系统的防雷设备。 The invention relates to the field of electric equipment maintenance, in particular to the lightning protection equipment of the power transmission line monitoring system.
背景技术 Background technique
输电线路是电网的重要组成部分，它不仅是输送和分配电能的载体，还能将几个电网连接起来形成电力系统。输电线路故障是电网故障的诱因，一旦电力线路的某一部位发生问题，则会产生连锁反应，影响整个电网系统的运行，所以输电线路的安全运行是电网安全运行的保障，输电线路的保护是电力设施保护的重点工作之一。 The transmission line is an important part of the power grid. It is not only a carrier for the transmission and distribution of electrical energy, but also connects several power grids to form a power system. Transmission line failure is the cause of power grid failure. Once a problem occurs in a certain part of the power line, it will cause a chain reaction and affect the operation of the entire power grid system. Therefore, the safe operation of the transmission line is the guarantee for the safe operation of the power grid. The protection of the transmission line is One of the key tasks of power facility protection.
为了便于对输电线路进行维护，现有输电线路通常配备有大量监测系统，如输电线路导线温度监测系统、输电线路杆塔倾斜监测系统、输电线路覆冰预警监测系统、输电线路防盗报警监测系统等，通过这些监测系统可有效的对输电线路故障段进行预警。然而，输电线路的监测系统普遍设置在户外，易遭受雷击而导致内部的电路会产生瞬态的过电压或过电流，这会影响输电线路监测系统的性能，甚至会对监测系统造成不可恢复性的损坏。 In order to facilitate the maintenance of transmission lines, the existing transmission lines are usually equipped with a large number of monitoring systems, such as transmission line conductor temperature monitoring system, transmission line tower tilt monitoring system, transmission line icing early warning monitoring system, transmission line anti-theft alarm monitoring system, etc. These monitoring systems can effectively give early warning to the transmission line fault section. However, the monitoring system of the transmission line is generally installed outdoors, and it is vulnerable to lightning strikes, which will cause transient overvoltage or overcurrent in the internal circuit, which will affect the performance of the transmission line monitoring system, and even cause non-recoverability of the monitoring system. damage.
发明内容 Contents of the invention
本发明的目的在于克服现有输电线路的监测系统易受雷击损坏的问题，提供了输电线路监测系统的防雷设备，其不仅能吸收过电压和过电流，还能吸收残压，进而能降低输电线路监测系统损坏的机率。 The purpose of the present invention is to overcome the problem that the monitoring system of the existing transmission line is easily damaged by lightning, and provide a lightning protection device for the monitoring system of the transmission line, which can not only absorb overvoltage and overcurrent, but also absorb residual voltage, thereby reducing The probability of damage to the transmission line monitoring system.
本发明解决上述问题主要通过以下技术方案实现：输电线路监测系统的防雷设备，包括直流电正向传输线、直流电负向传输线、初级防护电路及次级防护电路，所述初级防护电路包括第一压敏电阻、第二压敏电阻、第三压敏电阻及多个并联的气体放电管，所述第二压敏电阻与第三压敏电阻串联，第二压敏电阻与第三压敏电阻构成的串联支路两端及第一压敏电阻两端均分别与直流电正向传输线和直流电负向传输线连接，初级防护电路中多个并联的气体放电管构成的并联支路一端连接在第二压敏电阻与第三压敏电阻之间的线路上，其另一端接地；所述次级防护电路包括第四压敏电阻、瞬态电压抑制二极管及多个并联的气体放电管，所述第四压敏电阻与瞬态电压抑制二极管并联，第四压敏电阻与瞬态电压抑制二极管构成的并联支路两端分别与直流电正向传输线和直流电负向传输线连接，次级防护电路中多个并联的气体放电管构成的并联支路一端与直流电负向传输线连接，其另一端接地。其中，压敏电阻是一种限压型保护器件，利用压敏电阻的非线性特性，当过电压出现在压敏电阻的两极间，压敏电阻可以将电压钳位到一个相对固定的电压值，从而实现对后级电路的保护。气体放电管是一种开关型保护器件，当两极间电压足够大时，极间间隙将放电击穿，由原来的绝缘状态转化为导电状态。瞬态电压抑制二极管是一种限压保护器件，作用与压敏电阻类似，其也是利用器件的非线性特性将过电压钳位到一个较低的电压值实现对后级电路的保护。本发明应用时用于输电线路监测系统的直流接口处，初级防护电路和次级防护电路在电源至输电线路监测系统之间的线路上依次设置。 The present invention solves the above problems mainly through the following technical solutions: the lightning protection equipment of the transmission line monitoring system includes a DC positive transmission line, a DC negative transmission line, a primary protection circuit and a secondary protection circuit. The primary protection circuit includes a first voltage A varistor, a second varistor, a third varistor and a plurality of gas discharge tubes connected in parallel, the second varistor is connected in series with the third varistor, and the second varistor and the third varistor form a Both ends of the series branch and the two ends of the first piezoresistor are respectively connected to the DC positive transmission line and the DC negative transmission line, and one end of the parallel branch composed of multiple parallel gas discharge tubes in the primary protection circuit is connected to the second voltage On the line between the varistor and the third varistor, the other end of which is grounded; the secondary protection circuit includes a fourth varistor, a transient voltage suppression diode and a plurality of gas discharge tubes connected in parallel, and the fourth The varistor is connected in parallel with the transient voltage suppression diode, and the two ends of the parallel branch composed of the fourth varistor and the transient voltage suppression diode are respectively connected with the DC positive transmission line and the DC negative transmission line, and multiple parallel connections in the secondary protection circuit One end of the parallel branch formed by the gas discharge tube is connected to the DC negative transmission line, and the other end is grounded. Among them, the varistor is a voltage-limiting protection device. Using the nonlinear characteristics of the varistor, when an overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value. , so as to realize the protection of the subsequent stage circuit. The gas discharge tube is a switch-type protective device. When the voltage between the two electrodes is large enough, the gap between the electrodes will break down the discharge, and the original insulating state will be converted into a conductive state. The transient voltage suppression diode is a voltage limiting protection device, which is similar to a varistor. It also uses the nonlinear characteristics of the device to clamp the overvoltage to a lower voltage value to protect the subsequent circuit. When the present invention is applied to the DC interface of the transmission line monitoring system, the primary protection circuit and the secondary protection circuit are sequentially arranged on the line between the power supply and the transmission line monitoring system.
进一步的，输电线路监测系统的防雷设备，还包括设置在初级防护电路与次级防护电路之间的退耦电路。本发明应用时退耦电路起到延时作用，能提升防护性能。 Further, the lightning protection equipment of the transmission line monitoring system also includes a decoupling circuit arranged between the primary protection circuit and the secondary protection circuit. When the present invention is applied, the decoupling circuit plays a time-delay function and can improve the protection performance.
进一步的，所述退耦电路为初级防护电路与次级防护电路之间的直流电正向传输线和直流电负向传输线构成的馈电线。本发明的退耦电路由直流电正向传输线和直流电负向传输线构成，采用导线构成的馈电线作用类似于电感，但其性能优于电感，其能克服在监测系统供电电流大时空心电感的体积过大而无法在电路上实现的问题。 Further, the decoupling circuit is a feeder composed of a DC positive transmission line and a DC negative transmission line between the primary protection circuit and the secondary protection circuit. The decoupling circuit of the present invention is composed of a direct current positive transmission line and a direct current negative transmission line. The feed line composed of wires is similar to an inductance, but its performance is better than that of an inductance. It can overcome the volume of the air-core inductance when the power supply current of the monitoring system is large. Problems that are too large to implement on a circuit.
进一步的，所述初级防护电路中压敏电阻的数量为两个。 Further, the number of varistors in the primary protection circuit is two.
进一步的，所述初级防护电路和次级防护电路两者气体放电管的数量均为两个。 Further, both the primary protection circuit and the secondary protection circuit have two gas discharge tubes.
进一步的，输电线路监测系统的防雷设备，还包括第一熔断器FU1和第二熔断器FU2，所述第一熔断器FU1串接在初级防护电路前置线路的直流电正向传输线1上，第二熔断器FU2串接在初级防护电路前置线路的直流电负向传输线2上。如此，在本发明的初级防护电路和次级防护电路损坏时，熔断器熔断，能进一步避免过电流对输电线路监测系统造成的损坏。 Further, the lightning protection equipment of the transmission line monitoring system also includes a first fuse FU1 and a second fuse FU2, and the first fuse FU1 is connected in series on the DC forward transmission line 1 of the front-end line of the primary protection circuit, The second fuse FU2 is connected in series with the direct current negative transmission line 2 of the front line of the primary protection circuit. In this way, when the primary protection circuit and the secondary protection circuit of the present invention are damaged, the fuse is blown, which can further avoid damage to the transmission line monitoring system caused by overcurrent.
综上所述，本发明具有以下有益效果：本发明包括初级防护电路和次级防护电路，其中，初级防护电路包括第一压敏电阻、第二压敏电阻、第三压敏电阻及多个并联的气体放电管，次级防护电路包括第四压敏电阻、瞬态电压抑制二极管及多个并联的气体放电管，初级防护电路采用压敏电阻与气体放电管结合的方式进行共模保护，次级防护电路采用第四压敏电阻与瞬态电压抑制二极管并联进行差模防护，采用多个气体放电管并联进行共模保护，本发明遭受雷击时，大部分的过电压和过电流通过初级防护电路的气体放电管进行泄放，次级防护电路再将输出残压进一步降低，如此，能达到保护输电线路监测系统的目的，降低输电线路监测系统损坏的机率。 In summary, the present invention has the following beneficial effects: the present invention includes a primary protection circuit and a secondary protection circuit, wherein the primary protection circuit includes a first varistor, a second varistor, a third varistor and a plurality of Parallel connection of gas discharge tubes, the secondary protection circuit includes a fourth varistor, transient voltage suppression diode and multiple parallel gas discharge tubes, the primary protection circuit uses a combination of varistors and gas discharge tubes for common mode protection, The secondary protection circuit uses the fourth varistor in parallel with the transient voltage suppression diode for differential mode protection, and multiple gas discharge tubes in parallel for common mode protection. When the invention is struck by lightning, most of the overvoltage and overcurrent pass through the primary The gas discharge tube of the protection circuit is discharged, and the secondary protection circuit further reduces the output residual voltage. In this way, the purpose of protecting the transmission line monitoring system can be achieved and the probability of damage to the transmission line monitoring system can be reduced.
附图说明 Description of drawings
图1为本发明一个具体实施例的电路原理图。 Fig. 1 is a schematic circuit diagram of a specific embodiment of the present invention.
附图中附图标记所对应的名称为：1、直流电正向传输线，2、直流电负向传输线，FU1、第一熔断器，FU2、第二熔断器，Rv1、第一压敏电阻，Rv2、第二压敏电阻，Rv3、第三压敏电阻，Rv4、第四压敏电阻，TVS1、瞬态电压抑制二极管，G1、第一气体放电管，G2、第二气体放电管，G3、第三气体放电管，G4、第四气体放电管。 The names corresponding to the reference signs in the drawings are: 1. DC positive transmission line, 2. DC negative transmission line, FU1, first fuse, FU2, second fuse, Rv1, first varistor, Rv2, The second varistor, Rv3, the third varistor, Rv4, the fourth varistor, TVS1, transient voltage suppression diode, G1, the first gas discharge tube, G2, the second gas discharge tube, G3, the third Gas discharge tube, G4, the fourth gas discharge tube.
具体实施方式 Detailed ways
下面结合实施例及附图，对本发明做进一步地的详细说明，但本发明的实施方式不限于此。 The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.
实施例1： Example 1:
如图1所示，输电线路监测系统的防雷设备，包括直流电正向传输线1、直流电负向传输线2、初级防护电路及次级防护电路，其中，初级防护电路包括第一压敏电阻Rv1、第二压敏电阻Rv2、第三压敏电阻Rv3及多个并联的气体放电管，第一压敏电阻Rv1两端分别与直流电正向传输线1和直流电负向传输线2连接，第二压敏电阻Rv2与第三压敏电阻Rv3串联，第二压敏电阻Rv2与第三压敏电阻Rv3构成的串联支路两端分别与直流电正向传输线1和直流电负向传输线2连接。本实施例中初级防护电路的气体放电管的数量均优选为两个，初级防护电路中两个气体放电管分别为第一气体放电管G1和第二气体放电管G2，第一气体放电管G1与第二气体放电管G2并联构成的并联支路一端连接在第二压敏电阻Rv2与第三压敏电阻Rv3之间的线路上，其另一端接地。次级防护电路包括第四压敏电阻Rv4、瞬态电压抑制二极管TVS1及多个并联的气体放电管，第四压敏电阻Rv4与瞬态电压抑制二极管TVS1并联，第四压敏电阻Rv4与瞬态电压抑制二极管TVS1构成的并联支路两端分别与直流电正向传输线1和直流电负向传输线2连接。本实施例中次级防护电路的气体放电管的数量也优选为两个，次级防护电路的两个气体放电管分别为第三气体放电管G3和第四气体放电管G4，第三气体放电管G3和第四气体放电管G4并联构成的并联支路一端与直流电负向传输线2连接，其另一端接地。本实施例中第四压敏电阻Rv4与瞬态电压抑制二极管TVS1并联及第三气体放电管G3与第四气体放电管G4并联构成多个并联支路，能达到降低残压和增大流通能力的目的。 As shown in Figure 1, the lightning protection equipment of the transmission line monitoring system includes a DC positive transmission line 1, a DC negative transmission line 2, a primary protection circuit and a secondary protection circuit, wherein the primary protection circuit includes a first varistor Rv1, The second piezoresistor Rv2, the third piezoresistor Rv3 and a plurality of gas discharge tubes connected in parallel, the two ends of the first piezoresistor Rv1 are respectively connected to the DC positive transmission line 1 and the DC negative transmission line 2, and the second piezoresistor Rv2 is connected in series with the third piezoresistor Rv3, and both ends of the series branch formed by the second piezoresistor Rv2 and the third piezoresistor Rv3 are respectively connected to the DC positive transmission line 1 and the DC negative transmission line 2. The number of gas discharge tubes in the primary protection circuit in this embodiment is preferably two, and the two gas discharge tubes in the primary protection circuit are respectively the first gas discharge tube G1 and the second gas discharge tube G2, and the first gas discharge tube G1 One end of the parallel branch formed by parallel connection with the second gas discharge tube G2 is connected to the line between the second piezoresistor Rv2 and the third piezoresistor Rv3, and the other end thereof is grounded. The secondary protection circuit includes a fourth varistor Rv4, a transient voltage suppression diode TVS1 and a plurality of gas discharge tubes connected in parallel, the fourth varistor Rv4 is connected in parallel with the transient voltage suppression diode TVS1, and the fourth varistor Rv4 is connected in parallel with the transient voltage suppression diode TVS1. The two ends of the parallel branch formed by the state voltage suppression diode TVS1 are respectively connected with the positive direct current transmission line 1 and the negative direct current transmission line 2 . The quantity of the gas discharge tube of the secondary protection circuit in the present embodiment is also preferably two, and the two gas discharge tubes of the secondary protection circuit are respectively the third gas discharge tube G3 and the fourth gas discharge tube G4, and the third gas discharge tube G3 One end of the parallel branch formed by the parallel connection of the tube G3 and the fourth gas discharge tube G4 is connected to the DC negative transmission line 2, and the other end is grounded. In this embodiment, the fourth varistor Rv4 is connected in parallel with the transient voltage suppression diode TVS1 and the third gas discharge tube G3 is connected in parallel with the fourth gas discharge tube G4 to form multiple parallel branches, which can reduce the residual voltage and increase the flow capacity the goal of.
本实施例中直流电正向传输线1和直流电负向传输线2为输电线路监测系统的直流接口与电源之间的线路，其中，初级防护电路和次级防护电路由电源至输电线路监测系统依次设置。本实施例应用时，大部分雷电流通过初级防护电路的第一压敏电阻Rv1和第三压敏电阻Rv3、或经过第二压敏电阻Rv2后，再经过第一气体放电管G1或第二气体放电管G2泄放掉，经过初级防护电路泄放后剩余的雷电流的一部分再经过第四压敏电阻Rv4或瞬态电压抑制二极管TVS1后，再经过第三气体放电管G3或第四气体放电管G4泄放掉。如此，本实施例在初级防护电路泄放大部分雷电流后再由次级防护电路进一步降低残压，以对输电线路监测系统进行保护。 In this embodiment, the DC positive transmission line 1 and the DC negative transmission line 2 are the lines between the DC interface of the transmission line monitoring system and the power supply, wherein the primary protection circuit and the secondary protection circuit are arranged sequentially from the power supply to the transmission line monitoring system. When this embodiment is applied, most of the lightning current passes through the first varistor Rv1 and the third varistor Rv3 of the primary protection circuit, or passes through the second varistor Rv2, and then passes through the first gas discharge tube G1 or the second The gas discharge tube G2 is discharged, and part of the remaining lightning current after the discharge of the primary protection circuit passes through the fourth varistor Rv4 or the transient voltage suppression diode TVS1, and then passes through the third gas discharge tube G3 or the fourth gas discharge tube. The discharge tube G4 is discharged. In this way, in this embodiment, after the primary protection circuit discharges most of the lightning current, the secondary protection circuit further reduces the residual voltage to protect the transmission line monitoring system.
实施例2： Example 2:
本实施例在实施例1的基础上做出了如下进一步限定：本实施例还包括设置在初级防护电路与次级防护电路之间的退耦电路，其中，退耦电路为初级防护电路与次级防护电路之间的直流电正向传输线1和直流电负向传输线2构成的馈电线。 This embodiment makes the following further limitations on the basis of Embodiment 1: this embodiment also includes a decoupling circuit arranged between the primary protection circuit and the secondary protection circuit, wherein the decoupling circuit is the primary protection circuit and the secondary protection circuit. The DC positive transmission line 1 and the DC negative transmission line 2 between the level protection circuits constitute the feeder.
实施例3： Example 3:
本实施例在实施例1或实施例2的基础上做出了如下进一步限定：本实施例还包括两个熔断器，分别为第一熔断器FU1和第二熔断器FU2，其中，第一熔断器FU1串接在初级防护电路前置线路的直流电正向传输线1上，第二熔断器FU2串接在初级防护电路前置线路的直流电负向传输线2上。本实用例在出现过电流或短路时，第一熔断器FU1或第二熔断器FU2熔断，能进一步保证输电线路监测系统的安全性。 This embodiment makes the following further limitations on the basis of Embodiment 1 or Embodiment 2: This embodiment also includes two fuses, namely the first fuse FU1 and the second fuse FU2, wherein the first fuse The fuse FU1 is serially connected to the DC positive transmission line 1 of the front line of the primary protection circuit, and the second fuse FU2 is connected in series to the DC negative transmission line 2 of the front line of the primary protection circuit. In this practical example, when an overcurrent or a short circuit occurs, the first fuse FU1 or the second fuse FU2 will be blown, which can further ensure the safety of the transmission line monitoring system.
如上所述，可较好的实现本发明。 As described above, the present invention can be preferably carried out. the
Claims (5)
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| CN108376979A (en) * | 2018-04-16 | 2018-08-07 | 淮阴师范学院 | A kind of laser diode electrostatic surge protection device |
| CN109245080A (en) * | 2018-10-29 | 2019-01-18 | 广州海格通信集团股份有限公司 | A kind of military equipment and subsystem 220V AC power source input port protection circuit |
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| CN112186724A (en) * | 2019-10-23 | 2021-01-05 | 四川电安智能科技有限公司 | Protective device based on overvoltage absorption energy storage |
| CN113394888A (en) * | 2021-06-29 | 2021-09-14 | 上海电机学院 | Online energy-taking power supply device based on power transmission line |
| CN113889995A (en) * | 2021-10-09 | 2022-01-04 | 富芯微电子有限公司 | Automobile instantaneous high-voltage protection sensing circuit |
| CN114465218A (en) * | 2022-01-17 | 2022-05-10 | 世格流体控制（上海）有限公司 | Overcurrent protection device and explosion-proof solenoid valve integrated with same |
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