WO2011144052A1 - 一种浪涌保护器件保护性能测评方法及装置 - Google Patents

一种浪涌保护器件保护性能测评方法及装置 Download PDF

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Publication number
WO2011144052A1
WO2011144052A1 PCT/CN2011/074375 CN2011074375W WO2011144052A1 WO 2011144052 A1 WO2011144052 A1 WO 2011144052A1 CN 2011074375 W CN2011074375 W CN 2011074375W WO 2011144052 A1 WO2011144052 A1 WO 2011144052A1
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Prior art keywords
surge
protection device
surge protection
current
oscilloscope
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PCT/CN2011/074375
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English (en)
French (fr)
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肖勇军
倪冬兵
许李园
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中兴通讯股份有限公司
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Publication of WO2011144052A1 publication Critical patent/WO2011144052A1/zh

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3271Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
    • G01R31/3272Apparatus, systems or circuits therefor

Definitions

  • the invention relates to a surge protection performance evaluation technology, in particular to a surge protection device protection performance evaluation method and device. Background technique
  • Lightning is a common weather phenomenon in nature.
  • Equipment especially outdoor equipment or equipment with outdoor signal lines, usually need to take surge protection measures on their power ports and signal ports, such as: Add surge protection devices in front of power ports and signal ports (SPD, Surge Protection) Device ).
  • SPD Surge Protection
  • the evaluation of surge protection performance is carried out through tests, that is, the surge immunity test is carried out.
  • the surge immunity test can be based on IEC 61000-4-5 Electromagnetic compatibility (EMC)- Part 4- 5 Testing and measurement techniques - Surge immunity test, when the surge protection measures can pass the relevant standards, the surge protection scheme is considered to be effective. Otherwise, the surge protection scheme can be considered invalid.
  • EMC Electromagnetic compatibility
  • the existing surge protection performance measurement method is a qualitative evaluation method, that is, for the evaluation method, there are only “effective” and “invalid” points, and there is no quantitative evaluation method. In other words, for a protection device or circuit, how much attenuation can be caused by external disturbance surges, there is no quantitative indicator to characterize.
  • the main object of the present invention is to provide a method and device for evaluating the protection performance of a surge device to achieve quantitative evaluation of the protection performance of the surge protection device.
  • the invention provides a method for evaluating the protection performance of a surge protection device, and setting a surge protector
  • the attenuation degree Dec of the device is a ratio of the sum of the surge currents before the surge protection device (Area) to the sum of the surge currents after the surge protection device C 2 (Area);
  • the method also includes:
  • the oscilloscope is used to detect the surge current before the surge protection device and the surge current after the surge protection device.
  • the method further includes: calling the oscilloscope Within the area function, get the ( ⁇ (Area) and ( 2 (Area).
  • the method before calling the area function in the oscilloscope, the method further comprises: calling an absolute value function in the oscilloscope to obtain an absolute value of the inrush current before and after flowing through the surge protection device ( ⁇ and ( 2 .
  • the present invention also provides a surge protection device protection performance evaluation device, the device comprising: a detection module and a surge protection device;
  • the detecting module is configured to record the inrush current before and after flowing through the surge protection device until the surge is discharged, and calculate the attenuation degree of the surge protection device Dec;
  • the Dec is a ratio indicating a sum of surge currents before the surge protection device (Area) and a sum of surge currents after the surge protection device C 2 (Area).
  • the device further includes a protected device for surge protection by the surge protection device; and/or,
  • a surge signal generator for generating a surge signal.
  • the device further includes:
  • the detecting module further includes: a first current sensing coil, a second current sensing coil, an oscilloscope, and a calculation module; wherein
  • a first current induction coil for sensing a surge current in front of the surge protection device
  • a second current induction coil for sensing a surge current after the surge protection device
  • An oscilloscope configured to detect a current induced by the first current induction coil and the second current induction coil, and send the detected current to the calculation module;
  • the calculation module is configured to calculate the attenuation of the surge protection device after receiving the current sent by the oscilloscope.
  • two channels of one of the oscilloscopes simultaneously detect currents induced by the first current induction coil and the second current induction coil.
  • the coupling/decoupling network is integrated with the surge signal generator.
  • the apparatus further includes an inspection device for verifying whether the protected device is normal.
  • the method and device for evaluating the performance of a surge protection device pre-set the attenuation degree of the surge protection device Dec.
  • the surge current before and after flowing through the surge protection device is recorded until the surge is released.
  • FIG. 1 is a schematic structural view of a device for monitoring performance of a surge protection device according to the present invention
  • FIG. 2 is a schematic structural view of a device for monitoring performance of a surge protection device according to the present invention
  • FIG. 3 is a schematic diagram of a method for evaluating protection performance of a surge protection device according to the present invention
  • FIG. 4 is a block diagram of a test circuit for evaluating the protection performance of a surge protection device according to an embodiment of the present invention.
  • the device for evaluating the protection performance of the surge protection device of the present invention is shown in FIG. 1 and includes: a detection module 11 and a surge protection device 12;
  • the detecting module 11 is configured to record the inrush current flowing before and after the surge protection device 12 until the surge is discharged, and calculate the attenuation degree of the surge protection device 12 according to the set attenuation degree Dec; the surge protection device 12, Used for surge protection of protected equipment;
  • the surge protection device 12 is the object of the evaluation performance of the present invention.
  • the Dec is the ratio of the sum of the surge currents before the surge protection device (Area) to the sum of the surge currents after the surge protection device C 2 (Area), and the Z3 ⁇ 4 C is expressed by the formula:
  • the apparatus may further include:
  • the protected device 13 is used for surge protection by the surge protection device 12;
  • a surge signal generator 14 for generating a surge signal
  • the surge signal generator 14 can generate: 1.2/50 ⁇ + 8 / 20 ⁇ combined wave, or
  • coupling / decoupling network 15 for coupling the surge signal generated by the surge signal generator 14 to the surge protection device 12 and the protected device 13 so as to be protected Other devices connected to the device 13 are protected;
  • the coupling/decoupling network 15 and the surge signal generator 14 can be integrated.
  • the detecting module 11 may further include: a first current sensing coil 111, a second current sensing coil 112, an oscilloscope 113, and a calculation module 114;
  • the first current sensing coil 111 is configured to sense a surge current before the surge protection device 12; here, the first current induction coil 111 is placed in the surge signal generator 15, the coupling/decoupling network Between the network 16 and the surge protection device 12;
  • the second current sensing coil 112 is configured to sense a surge current after the surge protection device 12; here, the second current induction coil 112 is placed on the surge protection device 12 and the protected device
  • the oscilloscope 113 is configured to detect the current induced by the first current sensing coil 111 and the second current sensing coil 112, and send the detected current to the calculation module 114;
  • the oscilloscope 113 is a high-bandwidth oscilloscope, and the response frequency of the oscilloscope 113 is higher than the frequency of the surge signal; the two current channels of one oscilloscope can be used to simultaneously detect the first current induction coil 111 and the second current induction coil 112. Current.
  • the calculation module 114 is configured to receive the current sent by the oscilloscope 113, according to the set attenuation
  • Z3 ⁇ 4 C calculates the spring reduction complex of the surge protection device 12.
  • the device may further comprise:
  • the present invention also provides a method for evaluating the protection performance of a surge protection device. As shown in FIG. 3, the method includes the following steps:
  • Step 301 Setting the attenuation of the surge protection device z3 ⁇ 4 c is the ratio of the sum C of the inrush current before the surge protection device to the sum of the inrush current after the surge protection device C 2 (Area), after Step 302 is performed; wherein, the formula is expressed as: C ⁇ Area "j; where C (A represents the sum of the inrush currents before the surge protection device, C 2 04r ⁇ ) represents the surge protection device The sum of the inrush currents.
  • the physical meaning of the two is the sum of the absolute values of the currents in the sample time, that is, the energy;
  • the basis for setting the attenuation degree Dec is: The surge current after the surge protection device directly enters the protected device, thereby affecting the protected device, and the smaller the surge current value after the surge protection device is, The smaller the impact on the protected equipment, the more the surge is generated, so the ratio of the sum of the surge current after the surge protection device to the sum of the surge currents before the surge protection device To determine the protection performance of the surge protection device.
  • Step 302 When a surge occurs, record the inrush current flowing before and after the surge protection device until the surge is discharged;
  • the surge current before and after flowing through the surge protection device is the sum of the current generated by the entire surge and the bleed process, when the oscilloscope is used to detect the surge current and the surge protection device before the surge protection device
  • the inrush current is current
  • it is the area enclosed by the current curve and the time axis in the oscilloscope.
  • it can be calculated by calling the Area function in the oscilloscope.
  • the Area function is called to calculate the area, the current decays very fast with time.
  • the statistical time is about 5 times of the half-peak time of the surge.
  • Step 303 Calculate the attenuation degree of the surge protection device Dec;
  • the surge protection is considered when the attenuation z3 ⁇ 4 c is less than or equal to 0.3. Device protection performance is effective.
  • FIG. 4 is a test circuit block diagram of the protection performance evaluation of the surge protection device of the embodiment.
  • This embodiment is mainly for a single-phase AC power port, such as AC220V, for surge test, according to the requirements of the IEC61000-4-5 standard, the AC power port surge
  • the signal generator waveform is 1.2/ 50 ⁇ + 8 / 20 ⁇ combined wave
  • the coupling capacitor in the coupling/decoupling network is selected (common mode), or 18 (differential mode)
  • the power supply decoupling inductance is 1.5mH.
  • the surge protection device is the object to be evaluated.
  • the YD40K320EH single-phase AC power supply lightning arrester is selected as the object to be evaluated.
  • an oscilloscope with a bandwidth of 10 MHz or more, such as LeCroy's WaveSurfer 64Xs-A, can be used with a bandwidth of 600 MHz.
  • the purpose of using an oscilloscope is to sample the sum of the absolute values of the current over a period of time, rather than the transient current at a certain point in time.
  • the surge signal generator voltage waveform is 1.2/50 ⁇ , 50 ⁇ is the voltage half-peak time, considering that the signal attenuation is almost exponentially decayed, the current decays rapidly and oscillates near the OA, and eventually tends to zero, therefore,
  • the current sampling time can be selected as 200 ⁇ .
  • the surge signal generator and the coupling/decoupling network are specified in the relevant standards and should be strictly implemented in accordance with the standards. In the specific operation process, there are corresponding instruments and equipment to complete the corresponding functions, only need to connect the relevant equipment, cables and ports as required.
  • the input is the port before the protection, and is connected to the surge signal generator and the coupling/decoupling network.
  • the output is the protected port and is connected to the protected device.
  • the protection ground/3 ⁇ 4 of the surge protection device is connected to the protection ground of the surge signal generator, the protective ground of the coupling/decoupling network, and both connected to the earth.
  • the input side cable and the output side cable of the surge protection device need to be placed naturally, and they cannot be stacked or bundled together to avoid mutual coupling.
  • the two channels of one oscilloscope can be used to simultaneously detect the ⁇ and ⁇ induced by the two induction coils, and the entire surge venting process can be dynamically monitored by the oscilloscope.
  • the absolute value function in the oscilloscope By calling the absolute value function in the oscilloscope, the corresponding absolute values C ⁇ and C 2 of ⁇ and / 2 are obtained, and then the sum of C ⁇ and C 2 in the sampling time is obtained by calling the area function in the oscilloscope ( ⁇ 4 / ⁇ ), C 2 ⁇ Area) , that is, energy.
  • the protection performance of the surge protection device is considered to be effective.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Description

一种浪涌保护器件保护性能测评方法及装置 技术领域
本发明涉及浪涌保护性能测评技术, 尤其涉及一种浪涌保护器件保护 性能测评方法及装置。 背景技术
雷电是自然界中常见的一种天气现象。 设备, 尤其是户外设备或带户 外信号线的设备, 通常都需要在其电源端口、 信号端口釆取浪涌保护措施, 比如: 在电源端口、 信号端口前增加浪涌保护器件(SPD, Surge Protection Device )。 目前, 一般, 测评浪涌保护性能是通过试验进行, 即: 进行浪涌 抗 4尤性试险, 举个例子来说, 可以依据 《IEC 61000-4-5 Electromagnetic compatibility (EMC)- Part 4-5 Testing and measurement techniques - Surge immunity test》标准试验, 当浪涌保护措施能通过相关标准要求时, 则认为 该浪涌保护方案是有效的, 否则, 可认为该浪涌保护方案是无效的。
然而, 现有的浪涌保护性能测评方法是一种定性的测评方法, 也就是 说, 对于测评方法, 只有 "有效" 和 "无效" 之分, 而无一个定量的测评 分析方法。 换句话说, 对于一个保护器件或电路, 其对外界的干扰浪涌能 起到多大的衰减, 则没有一个定量的指标来表征。 发明内容
有鉴于此, 本发明的主要目的在于提供一种浪涌器件保护性能测评方 法及装置, 以实现对浪涌保护器件保护性能的定量测评。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供了一种浪涌保护器件保护性能测评方法, 设置浪涌保护器 件的衰减度 Dec为表示浪涌保护器件前的浪涌电流的总和 (Area)与浪涌保 护器件后的浪涌电流的总和 C2 (Area)之比;
该方法还包括:
当浪涌发生时, 记录流经浪涌保护器件前后的浪涌电流, 直至浪涌泄 t;
计算所述浪涌保护器件的衰减度 Dec。
上述方案中, 釆用示波器探测浪涌保护器件前的浪涌电流及浪涌保护 器件后的浪涌电流, 所述计算所述浪涌保护器件的衰减度 Dec之前, 该方法 进一步包括: 调用示波器内的面积函数, 获得所述(^ (Area)及( 2 (Area)。
上述方案中, 在调用示波器内的面积函数之前, 该方法进一步包括: 调用示波器内的绝对值函数, 获得流经浪涌保护器件前后的浪涌电流 的绝对值 (^及( 2
本发明还提供了一种浪涌保护器件保护性能测评装置, 该装置包括: 检测模块及浪涌保护器件; 其中,
检测模块, 用于记录流经浪涌保护器件前后的浪涌电流, 直至浪涌泄 放, 并计算浪涌保护器件的衰减度 Dec ;
浪涌保护器件, 用于对被保护设备进行浪涌保护;
所述 Dec为表示浪涌保护器件前的浪涌电流的总和 (Area)与浪涌保护 器件后的浪涌电流的总和 C2 (Area)之比。
上述方案中, 该装置进一步包括被保护设备, 用于被浪涌保护器件进 行浪涌保护; 和 /或,
浪涌信号发生器, 用于产生浪涌信号。
上述方案中, 该装置进一步包括:
耦合 /去耦网络, 用于将浪涌信号发生器产生的浪涌信号全部耦合到浪 涌保护器件及被保护设备上。 上述方案中, 所述检测模块进一步包括: 第一电流感应线圈、 第二电 流感应线圈、 示波器、 以及计算模块; 其中,
第一电流感应线圈, 用于感应浪涌保护器件前的浪涌电流;
第二电流感应线圈, 用于感应浪涌保护器件后的浪涌电流;
示波器, 用于探测第一电流感应线圈与第二电流感应线圈感应的电流, 并将探测到的电流发送给计算模块;
计算模块, 用于收到示波器发送的电流后, 计算浪涌保护器件的衰减 复 Dec。
上述方案中, 一个所述示波器的两个通道同时分别探测所述第一电流 感应线圈与所述第二电流感应线圈感应的电流。
上述方案中, 所述耦合 /去耦网络与所述浪涌信号发生器集成在一起。 上述方案中, 该装置进一步包括检验设备, 用于检验被保护设备是否 正常。
本发明提供的浪涌保护器件性能测评的方法及装置, 预先设置浪涌保 护器件的衰减度 Dec , 在浪涌发生时, 记录流经浪涌保护器件前后的浪涌电 流, 直至浪涌泄放, 根据设置的衰减度 Dec , 计算所述浪涌保护器件的衰减 复 Dec , 衰减度 Z¾C越小, 对被保护设备的保护性能就越好, 如此, 能实现 对浪涌保护器件保护性能的定量测评, 进而能更好的测评各个浪涌保护器 件。 附图说明
图 1为本发明浪涌保护器件保护性能测评的装置结构示意图; 图 2为本发明浪涌保护器件保护性能测评的具体的装置结构示意图; 图 3为本发明浪涌保护器件保护性能测评的方法流程示意图; 图 4为本发明实施例浪涌保护器件保护性能测评的测试电路框图。 具体实施方式 下面结合附图及具体实施例对本发明再作进一步详细的说明。
本发明浪涌保护器件保护性能测评的装置如图 1 所示, 包括: 检测模 块 11及浪涌保护器件 12; 其中,
检测模块 11 , 用于记录流经浪涌保护器件 12前后的浪涌电流, 直至浪 涌泄放, 并根据设置的衰减度 Dec计算浪涌保护器件 12的衰减度 Dec ; 浪涌保护器件 12, 用于对被保护设备进行浪涌保护;
这里, 浪涌保护器件 12是本发明被测评保护性能的对象;
所述 Dec为浪涌保护器件前的浪涌电流的总和 (Area)与浪涌保护器件 后的浪涌电流的总和 C2 (Area)之比, 所述 Z¾C用公式表达, 则为:
^ C (Area)
Dec = ^j r
C^Area) ° 其中, 如图 2所示, 该装置还可以进一步包括:
被保护设备 13, 用于被浪涌保护器件 12进行浪涌保护;
浪涌信号发生器 14, 用于产生浪涌信号;
这里, 所述浪涌信号发生器 14可以产生: 1.2/50^ + 8 / 20^组合波、 或
ΙΟ / 700/β电压波形等; 耦合 /去耦网络 15 , 用于将浪涌信号发生器 14产生的浪涌信号全部耦 合到浪涌保护器件 12及被保护设备 13之上, 以便对被保护设备 13连接的 其它设备进行保护;
这里, 一般,耦合 /去耦网络 15与浪涌信号发生器 14可以集成在一起。 所述检测模块 11 , 还可以进一步包括: 第一电流感应线圈 111、 第二电 流感应线圈 112、 示波器 113、 以及计算模块 114; 其中,
第一电流感应线圈 111 , 用于感应浪涌保护器件 12前的浪涌电流; 这里, 第一电流感应线圈 111放置在浪涌信号发生器 15、 耦合 /去耦网 络 16与浪涌保护器件 12之间;
第二电流感应线圈 112, 用于感应浪涌保护器件 12后的浪涌电流; 这里, 第二电流感应线圈 112, 放置于浪涌保护器件 12与被保护设备
13之间;
示波器 113 , 用于探测第一电流感应线圈 111与第二电流感应线圈 112 感应的电流, 并将探测到的电流发送给计算模块 114;
这里, 一般, 示波器 113为高带宽示波器, 示波器 113的响应频率高 于浪涌信号的频率; 可釆用一个示波器的两个通道同时分别探测第一电流 感应线圈 111与第二电流感应线圈 112感应的电流。
计算模块 114, 用于收到示波器 113发送的电流后, 根据设置的衰减度
C计算浪涌保护器件 12的泉减复 Dec。
该装置还可以进一步包括:
检验设备, 用于检验被保护设备是否正常。
基于上述装置, 本发明还提供了一种浪涌保护器件保护性能测评的方 法, 如图 3所示, 包括以下步骤:
步骤 301 : 设置浪涌保护器件的衰减度 z¾c为浪涌保护器件前的浪涌电 流的总和 C (Area)与浪涌保护器件后的浪涌电流的总和 C2 (Area)之比, 之后 执行步骤 302; 其中, 所述用公式表达, 则为: C^Area"j; 这里, C (A 表 示浪涌保护器件前的浪涌电流的总和, C204r^)表示浪涌保护器件后的浪涌 电流的总和。 二者的物理意义为釆样时间内的电流绝对值的总和, 即为能 量;
这里,设置衰减度 Dec的依据为: 浪涌保护器件后的浪涌电流会直接进 入被保护设备, 进而影响被保护设备, 浪涌保护器件后的浪涌电流值越小, 对被保护设备的影响也就越小, 而且, 浪涌的发生是一个过程, 因此, 可 以通过浪涌保护器件后的浪涌电流的总和与浪涌保护器件前的浪涌电流的 总和的比值来判断浪涌保护器件的保护性能。
步骤 302: 当浪涌发生时, 记录流经浪涌保护器件前后的浪涌电流, 直 至浪涌泄放;
这里, 所述流经浪涌保护器件前后的浪涌电流为整个浪涌产生、 及泄 放过程的电流总和, 当釆用示波器探测浪涌保护器件前的浪涌电流及浪涌 保护器件后的浪涌电流时, 即为示波器中电流曲线与时间轴围成的面积, 具体地, 可通过调用示波器中的 Area函数, 计算获得; 在调用 Area函数计 算面积时, 由于电流随时间的衰减非常快, 通常统计时间取浪涌半波峰时 间的 5倍左右。
步骤 303: 计算所述浪涌保护器件的衰减度 Dec;
本步骤中, Z¾C越小, 说明浪涌衰减得越多, 对被保护设备的保护性能 就越好, 反之则差, 一般, 认为当衰减度 z¾c小于等于 0.3时, 认为该浪涌 保护器件保护性能有效。
图 4为实施例浪涌保护器件保护性能测评的测试电路框图, 本实施例 主要针对单相交流电源端口,如 AC220V ,进行浪涌测试,根据 IEC61000-4-5 标准要求, 交流电源端口浪涌信号发生器波形为 1.2/ 50^ + 8 / 20^组合波,耦 合 /去耦网络中的耦合电容选取 (共模)、 或 18 (差模), 电源去耦电 感选取 1.5mH。 浪涌保护器件为待评估的对象, 如选取 YD40K320EH单相 交流电源防雷器作为待评估的对象, 该防雷器的各个标准参数包括: 电压 Un = 220V , 放电电流 /„ = 20M @ 8 / 20/tt , 最大通流容量 / = 40M @ , 响应时间 ί≤25ws
需要监测两路电流信号, 分别是浪涌保护器件之前的浪涌电流和浪涌 保护器件之后的浪涌电流, 分别记为 ^和 。 由于浪涌泄放为/ F级脉冲信 号, 因此, 可釆用带宽在 10MHz以上的示波器, 如 LeCroy的 WaveSurfer 64Xs-A, 带宽为 600MHz。 釆用示波器的目的是为了釆样一段时间内的电 流绝对值总和, 而不是某一时刻的瞬态电流值。 由于浪涌信号发生器电压 波形为 1.2/50^ , 50^为电压半峰值时间, 考虑到信号的衰减几乎是按照 指数衰减, 电流迅速衰减并在 OA附近振荡, 并最终趋于 0, 因此, 电流的 釆样时间可选用 200 ^。 本实施例中, 浪涌信号发生器和耦合 /去耦网络在相关标准中均有具体 规定, 应按照标准严格执行。 在具体操作过程中, 均有相应的仪器设备来 完成相应的功能, 只需要将相关设备、 线缆、 端口按要求连接好即可。
在浪涌保护器件连接时, 应注意浪涌保护器件的输入端和输出端连接 是否正确, 避免出现反接的情况。 输入端是没有保护之前的端口, 与浪涌 信号发生器、 耦合 /去耦网络相连。 输出端是保护之后的端口, 与被保护设 备相连。
浪涌保护器件中保护地/¾与浪涌信号发生器的保护地 、 耦合 /去耦 网络的保护地 相连, 并都连接至大地。 浪涌保护器件输入端侧线缆与输出端侧线缆需要自然摆放, 不能将其 堆放或捆扎在一起, 以免造成相互之间的耦合。
在电源端口进行浪涌试验的过程中, 可使用一个示波器的两个通道同 时分别探测两个感应线圈感应的 ^和^, 通过示波器动态监测整个浪涌泄 放过程。 通过调用示波器内的绝对值函数, 从而获取 Λ、 /2的对应的绝对 值 C\、 C2 , 再通过调用示波器内的面积函数获取 C\、 C2在釆样时间内的总 和(^ 4/^)、 C2 {Area) , 即能量。
浪涌泄放后, 釆用预先设置的衰减度 )ec , 即:
^ C (Area)
Dec二 ^ j r
C Area) 计算该浪涌保护器件的衰减度 )ec , Dec越小, 说明浪涌衰减得越多, 对被保护设备的保护性能就越好, 反之则差, 一般, 认为当 £^小于等于
0.3时, 认为该浪涌保护器件保护性能有效。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围, 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种浪涌保护器件保护性能测评方法, 其特征在于, 设置浪涌保护 器件的衰减度 Dec为浪涌保护器件前的浪涌电流的总和 C\ (Area)与浪涌保护 器件后的浪涌电流的总和 C2 (Area)之比;
该方法还包括:
当浪涌发生时, 记录流经浪涌保护器件前后的浪涌电流, 直至浪涌泄 放;
计算所述浪涌保护器件的衰减度 Dec。
2、 根据权利要求 1所述的方法, 其特征在于, 釆用示波器探测浪涌保 护器件前的浪涌电流及浪涌保护器件后的浪涌电流, 所述计算所述浪涌保 护器件的衰减度 Dec之前, 该方法进一步包括: 调用示波器内的面积函数, 获得所述 C, (Area)及 C2 (A rea)。
3、 根据权利要求 2所述的方法, 其特征在于, 在调用示波器内的面积 函数之前, 该方法进一步包括:
调用示波器内的绝对值函数, 获得流经浪涌保护器件前后的浪涌电流 的绝对值 (^及( 2
4、 一种浪涌保护器件保护性能测评装置, 其特征在于, 该装置包括: 检测模块及浪涌保护器件; 其中,
检测模块, 用于记录流经浪涌保护器件前后的浪涌电流, 直至浪涌泄 放, 并计算浪涌保护器件的衰减度 Dec ;
浪涌保护器件, 用于对被保护设备进行浪涌保护;
所述 Dec为浪涌保护器件前的浪涌电流的总和 C\ (Area)与浪涌保护器件 后的浪涌电流的总和 C2 (Area)之比。
5、 根据权利要求 4所述的装置, 其特征在于, 该装置进一步包括被保 护设备, 用于被浪涌保护器件进行浪涌保护; 和 /或, 浪涌信号发生器, 用于产生浪涌信号。
6、 根据权利要求 5所述的装置, 其特征在于, 该装置进一步包括: 耦合 /去耦网络, 用于将浪涌信号发生器产生的浪涌信号全部耦合到浪 涌保护器件及被保护设备上。
7、 根据权利要求 4、 5或 6所述的装置, 其特征在于, 所述检测模块 进一步包括: 第一电流感应线圈、 第二电流感应线圈、 示波器、 以及计算 模块; 其中,
第一电流感应线圈, 用于感应浪涌保护器件前的浪涌电流;
第二电流感应线圈, 用于感应浪涌保护器件后的浪涌电流;
示波器, 用于探测第一电流感应线圈与第二电流感应线圈感应的电流, 并将探测到的电流发送给计算模块;
计算模块, 用于收到示波器发送的电流后, 计算浪涌保护器件的衰减 复 Dec。
8、 根据权利要求 7所述的装置, 其特征在于, 一个所述示波器的两个 通道同时分别探测所述第一电流感应线圈与所述第二电流感应线圈感应的 电流。
9、 根据权利要求 6所述的装置, 其特征在于, 所述耦合 /去耦网络与所 述浪涌信号发生器集成在一起。
10、 根据权利要求 5或 6所述的装置, 其特征在于, 该装置进一步包 括检验设备, 用于检验被保护设备是否正常。
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