WO2019100805A1 - 一种保护压板电位便捷测量装置 - Google Patents

一种保护压板电位便捷测量装置 Download PDF

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WO2019100805A1
WO2019100805A1 PCT/CN2018/103991 CN2018103991W WO2019100805A1 WO 2019100805 A1 WO2019100805 A1 WO 2019100805A1 CN 2018103991 W CN2018103991 W CN 2018103991W WO 2019100805 A1 WO2019100805 A1 WO 2019100805A1
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test
potential
pressure plate
signal conditioning
protection
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PCT/CN2018/103991
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English (en)
French (fr)
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金木坤
江海
杨钦泽
童凯
韩建波
刘小冰
黄绍伦
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中国南方电网有限责任公司超高压输电公司天生桥局
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Publication of WO2019100805A1 publication Critical patent/WO2019100805A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques

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  • the invention relates to a power device measuring device, in particular to a convenient testing device for protecting a pressure plate potential, which is used for detecting the voltage of the two ends of the protective platen to be grounded during the switching operation of the substation operator.
  • the secondary equipment operation is mainly to protect the operation of the pressure plate.
  • the protection pressure plate is also often called the protection contig. It is an important bridge and link for the protection device in the substation to contact the external wiring, which is related to the protection work and Whether the action exit works normally.
  • protection function pressure plate According to the position of the secondary circuit of the protection platen access protection device, it can be divided into two types: protection function pressure plate and outlet pressure plate.
  • the function pressure plate is mainly to realize some functions of the protection device, such as main protection, distance protection, zero sequence protection, differential protection, etc., and is a "switch" of these functions. Therefore, there is voltage on both sides, and the signal is sent to the protection device after the connection, and the corresponding function is activated. In order to ensure the anti-interference ability, the substation now uses more 110VDC strong point function pressure plate.
  • the outlet pressure plate determines the result of the protection action. According to the different objects of the protection action outlet, it can be divided into the trip outlet pressure plate and the starting pressure plate.
  • the tripping outlet pressure plate directly acts on the switch or other switches in the jump; the starting pressure plate is used as other protection opening and opening, such as failure to start the pressure plate, and the lock is prepared from the pressure plate. Therefore, if there is voltage on both sides before the input, the input will trip. In general, a negative voltage is always present (the circuit breaker trip circuit is complete) and a positive voltage is connected in series to protect the node. In the protection action, the node is closed and a positive voltage is sent to the pressure plate. If the pressure plate is put in, the positive power is turned on by the pressure plate, and the protection device trips.
  • the substation operator needs to detect the ground potential at both ends of the protection platen beforehand for subsequent operations.
  • the strong voltage plate is generally 110VDC.
  • the substation operator generally uses a multimeter to detect the potential of the protection platen. Because one person needs to hold two positive and negative multimeter pens, the other person holds the multimeter to cooperate, and the detection of the lower end of the platen needs to be carried out separately. In the implementation process, the memory potential value is required twice, and the two potential values are compared. There are obvious drawbacks in this way. First, there are more operators; second, the operation process is not convenient; third, the test values depend on human memory, and it is inevitable that there is a possibility of misjudgment. For areas where substation safety requirements are very high, the consequences of human error are very serious.
  • the present invention proposes a convenient test device for protecting the platen potential that can be completed by a single person, thereby reducing the number of operators, simplifying the test process, and maintaining the potential indication value of the lower end portion of the test protection platen. Effectively avoid the dependence on the judgment of human memory output.
  • the utility model relates to a convenient measuring device for protecting the pressure of the pressure plate, which can simultaneously detect the potential of the lower end portions of the pressure plate and the potential of the two ends of the pressure plate under a single operation, including: the main body of the device and three test external devices arranged at the front part of the device body a terminal, one of the test external terminals is connected to a test clip by a wire body, the test clip is for connecting to a ground potential, and the other two test external terminals are respectively connected by a wire body for a potential to contact the lower end portion of the protection platen Test pen.
  • the main body of the device comprises two built-in and independent signal conditioning circuits, and the signal conditioning circuit comprises a voltage-ratio switching circuit sequentially connected in series, a Sallen-Key active low-pass filter, a ⁇ - ⁇ type high-precision ADC, and two signal conditioning circuits.
  • the ⁇ - ⁇ high-precision ADC is connected to a processor, such as a 32-bit ARM microcontroller, the processor is connected to a display, and the ⁇ - ⁇ high-precision ADC of the two signal conditioning circuits is also provided with a common high precision. Voltage reference source.
  • the voltage-ratio circuit can ensure that the optimal matching analog voltage is achieved by adaptively adjusting the ratio under different relative potentials, and input to the high-precision ADC through the low-pass filter; the design features of the two independent conditioning front ends are: protection The potential value of the lower end of the platen can maintain the best detection accuracy at full scale; a common voltage reference source is designed to maintain the same voltage reference value for two independent ADCs, which can be affected by temperature changes. Maintain consistency while saving costs.
  • the single-chip microcomputer in the device displays the potential value to the screen of the device after processing the data, and provides an intuitive judgment of the operating personnel.
  • the back of the device adopts a magnet, and the main body of the device can be adsorbed on the metal body near the protection platen by magnetic force during the test, so that the operator does not need to hold it.
  • test clip is pluggable, one end is a wire body, and is directly connected to the main body of the device, and the other end is a metal clamping portion, which is connected to the ground potential, so that the ground potential is obtained without an operator. Handheld.
  • the above device is powered by a built-in lithium battery and is provided with a 5 VDC charging interface.
  • the invention has the following advantages and beneficial effects: 1.
  • the improvement of the hand-held mode and the clamping mode completely realizes single-person operation; 2. It does not need to separately test the lower end of the protection platen, and fully realizes Convenient operation; 3, the test results are visually displayed, the potential of the upper and lower ends of the protection platen does not need to rely on memory judgment, avoiding human error; 4, the improvement of the circuit structure, compared with the prior art requires two separate multimeter detection It not only maintains high-precision testing, but also realizes the advantages of saving device cost, reducing device size, and reducing device weight.
  • FIG. 1 is a schematic structural view of a simple device for protecting a platen potential according to the present invention.
  • FIG. 2 is an internal circuit diagram of a simple device for protecting a platen potential according to the present invention.
  • 10-device body 20-display; 30-magnet; 40-protection plate lower end test pen; 50-test clip; 60-protection plate end test pen; 70-charge power socket; 11-protection plate lower end external Terminal interface; 12-ground potential external terminal interface; 13-protection plate end external terminal interface; 14-first signal conditioning circuit; 141-first voltage ratio circuit; 142-first channel Sallen-Key active low Pass filter; 143-first ⁇ - ⁇ type high precision ADC; 15-second signal conditioning circuit; 151-second voltage variable analog mode circuit; 152-second Sallen-Key active low pass filter ; 153 - second way ⁇ - ⁇ type high precision ADC; 16-ARM microcontroller; 17 - high precision voltage reference.
  • a convenient measuring device for protecting a platen potential includes a device body 10, and a front surface of the device body 10 is provided with a display screen 20 for providing an operator to visually observe the potential difference between the protective platen and the lower end portion and the ground potential. .
  • the magnet body 30 is provided on the back surface of the apparatus main body 10 for adsorbing the apparatus main body in use on the metal body in the vicinity of the protective platen.
  • the front part of the apparatus main body 10 is provided with three external terminal interfaces: an external terminal interface 11 for protecting the lower end portion of the pressure plate, an external terminal connection terminal 12 for ground potential, and an external terminal interface 13 for protecting the end portion of the pressure plate.
  • the external terminal interface 11 of the lower end of the protection platen is connected through the wire body for connecting the lower end of the protection platen test pen 40, the ground potential external terminal interface 12 is connected to the ground potential test clamp 50 through the wire body, and the external terminal interface 13 of the protection platen is passed through the line.
  • the body is used to connect the end test pen 60 on the protective platen.
  • the operator directly clamps the ground potential test clip 50 on the ground potential metal body to form a potential reference point; thereafter, the left and right hands respectively hold the test pen 40 and the test pen 60, respectively contacting the lower end portion of the protection platen to obtain the potential thereof. .
  • a 5 VDC charging power socket 70 is provided at the rear of the apparatus main body 10 for charging the lithium battery built in the apparatus main body 10.
  • the internal circuit of the device body 10 includes a first signal conditioning circuit 14 connected to the external terminal interface 11 at the lower end of the protection platen, and a second signal conditioning circuit 15 connected to the external terminal interface 13 at the end of the platen.
  • a signal conditioning circuit 14 includes a first pass voltage ratio circuit 141, a first pass Sallen-Key active low pass filter 142, and a first pass ⁇ - ⁇ type high precision ADC 143.
  • the second signal conditioning circuit 15 includes a second voltage variable analog mode circuit 151, a second way Sallen-Key active low pass filter 152, and a second path ⁇ - ⁇ type high precision ADC 153, which are sequentially connected in series, the first path
  • the - ⁇ type high precision ADC 143 is connected in common to the second ⁇ - ⁇ type high precision ADC 153 to a 32-bit ARM microcontroller 16, and the ARM microcontroller 16 is connected to the display 20.
  • a common high-precision voltage reference source 17 is also provided between the first ⁇ - ⁇ type high precision ADC 143 and the second ⁇ - ⁇ type high precision ADC 153.
  • the shared high-precision voltage reference source 17 maintains the same voltage reference for two independent ADCs, which is consistent with temperature variations and provides cost savings.
  • the first signal conditioning circuit 14 and the second signal conditioning circuit 15 are independent of each other, and the optimum measurement accuracy can be realized by adaptively adjusting the ratio according to the respective input voltage values.
  • the improvement of the hand-held mode, the clamping mode and the circuit structure of the device can greatly simplify the operation mode of the prior art substation that needs to be double-operated with the multimeter to measure the potential of the lower end of the pressure plate before the input of the protection platen, and realizes the operation mode.
  • Single and single convenient operation the advantages of visual display results.

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  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

公开了一种保护压板电位便捷测量装置，包括装置主体、设置于装置主体前部的三个测试外接端子，其中一个测试外接端子连接一测试夹，另外两个测试外接端子分别连接电位测试笔，装置主体包括两路信号调理电路，两路信号调理电路分别与连有电位测试笔的测试外接端子连接，信号调理电路包括串接的电压变比切换电路、Sallen-Key有源低通滤波器及Σ-Δ型高精度ADC，两个Σ-Δ型高精度ADC共同连接于一处理器，处理器连接一显示屏，两个电压变比切换电路均与连接测试夹的测试外接端子电连接。实现了单人便捷操作；检测结果直观显示；对电路结构的改进，既保持了高精度的测试，又减小了装置体积及重量，节约了器件成本。

Description

一种保护压板电位便捷测量装置 技术领域
本发明涉及一种电力设备测量装置，具体涉及一种保护压板电位便捷测试装置，用于变电站运行人员倒闸操作过程中检测即将投入保护压板的两端对地电压。
背景技术
在变电站运行人员的日常操作中，二次设备操作主要为保护压板的操作，保护压板也常称为保护连片，是变电站中保护装置联系外部接线的重要桥梁和纽带，关系到保护的工作和动作出口是否正常发挥作用。
根据保护压板接入保护装置二次回路的位置不同，可分为保护功能压板和出口压板两类。
功能压板主要是实现保护装置的某些功能，如主保护、距离保护、零序保护、纵差保护等的投入和退出，是这些某一功能的“开关”。因此，两侧均有电压，连接后即将信号送至保护装置，启动相应功能。为了保证抗干扰能力，现在变电站采用得更多的是110VDC的强点功能压板。
出口压板决定了保护动作的结果，根据保护动作出口作用的对象不同，可分为跳闸出口压板和启动压板。跳闸出口压板直接作用于本开关或联跳其他开关；启动压板作为其他保护开入使用，如失灵启动压板、闭锁备自投压板等。因此，在投入之前如果两侧均有电压，投入即会跳闸。一般来说，负电压一直存在(断路器跳闸回路完整)，正电压串联保护节点。在保护动作，节点闭合，将正电压送至压板，若压板投入，则通过压板将正电源接通，保护装置跳闸。
上述倒闸操作过程中，出于安全的考虑，变电站运行人员需要预先对保护压板两端对地电位进行检测，方可进行后续操作。
对于功能压板，需要检测保护压板两端有等同电位后才投入压板(强电压板一般为110VDC)。
对于跳闸出口压板，需要测量保护压板两端对地非相异极性电位后才能投入压板，出口压板的两端对地电位会存在四种可能的情况：
压板上端部对地电位+110VDC，下端部对地电位+110VDC，此时保护有出 口，跳闸回路不通；
压板上端部对地电位0V，下端部对地电位0V，此时跳闸回路断线不通；
压板上端部对地电位-110VDC，下端部对地电位0V，此时保护没有出口；
压板上端部对地电位-110VDC，下端部对地电位+110VDC，此时保护有出口。
现有技术中，变电站运行人员一般采用万用表对保护压板的电位进行检测。因为需要一个人操持正负两根万用表表笔，另一人手持万用表配合，同时对于压板上下端部的检测，需要分别进行，实施过程中还需要两次记忆电位值，并对两次电位值对比。这样的方式存在明显的弊端，一是操作人员较多；二是操作过程不便捷；三是前后测试值要依赖人为记忆，难免存在误判的可能。对于变电站安全要求非常高的领域，人为失误带来的后果非常严重。
发明专利内容
有鉴于此，本发明提出了一种可单人单次完成的保护压板电位便捷测试装置，以减少操作人员的数量、简化测试过程，同时可保持测试保护压板上下端部的电位示值，能有效避免对人为记忆输出判断的依赖。
为实现上述目标，本发明提供如下技术方案：
一种保护压板电位便捷测量装置，可单人单次操作下同时检测保护压板上下两端部对地的电位以及压板两端电位，包括：装置主体、设置于装置主体前部的三个测试外接端子，其中一个测试外接端子通过线体连接一测试夹，所述测试夹用于与地电位连接，所述另外两个测试外接端子分别通过线体连接用于与保护压板上下端部接触的电位测试笔。
装置主体包括两路内置且独立的信号调理电路，信号调理电路包括依次串接的电压变比切换电路、Sallen-Key有源低通滤波器、Σ-Δ型高精度ADC，两路信号调理电路的Σ-Δ型高精度ADC共同连接于一个处理器，如32位ARM单片机，处理器连接一显示屏，两路信号调理电路的Σ-Δ型高精度ADC之间还设置有一共用的高精度电压基准源。电压变比电路能保证不同的相对电位下，通过自适应调节变比达到最佳匹配的模拟电压，经低通滤波器后输入至高精度ADC；两路独立的调理前端的设计特点在于，对保护压板上下端部电位值能在全量程下保持最佳的检测精度；一个共用的电压基准源的设计特点在于，对两路独立的ADC 能够保持相同的电压参考值，其受温度变化的影响能保持一致性，同时节省成本。装置内的单片机经处理数据后将电位值显示至装置的屏幕上，提供运行人员直观判断。
进一步地，为了实现单人操作，上述装置背部采用磁铁，可在测试过程中利用磁性将装置主体吸附在保护压板附近的金属体上，因此无须操作人员手持。
进一步地，为了实现单人操作，上述测试夹是可插拔的，一端是线体，直接与装置主体相连，另一端是金属夹持部分，与地电位相连，因此地电位的获取无须操作人员手持。
进一步地，为了实现现场测试的便携性，上述装置采用内置锂电池供电，并设有5VDC的充电接口。
本发明与现有技术相比，具有以下优点与有益效果：1、对手持方式和夹持方式的改进，完全实现了单人操作；2、不需要对保护压板上下端部分别测试，完全实现了便捷操作；3、检测结果直观显示，保护压板的上下端部电位无需依赖记忆判断，避免了人为失误；4、对电路结构的改进，与现有技术需要用两个单独的万用表检测相比，既保持了高精度的测试，又实现了节约器件成本、减少装置体积、减轻装置重量等优点。
附图说明
图1为本发明保护压板电位简易装置的结构示意图。
图2为本发明保护压板电位简易装置的内部电路图。
图中各附图标记为：
10-装置主体；20-显示屏；30-磁铁；40-保护压板下端部测试笔；50-测试夹；60-保护压板上端部测试笔；70-充电电源插口；11-保护压板下端部外接端子接口；12-地电位外接端子接口；13-保护压板上端部外接端子接口；14-第一信号调理电路；141-第一路电压变比电路；142-第一路Sallen-Key有源低通滤波器；143-第一路Σ-Δ型高精度ADC；15-第二信号调理电路；151-第二路电压变比模电路；152-第二路Sallen-Key有源低通滤波器；153-第二路Σ-Δ型高精度ADC；16-ARM单片机；17-高精度电压基准源。
具体实施方式
下面结合附图和具体实施方式对本发明的内容做进一步详细说明。
结合参照图1，一种保护压板电位便捷测量装置，包括装置主体10，装置主体10的正面设置有显示屏20，用于提供给操作人员直观观察保护压板上、下端部与地电位的电位差。
装置主体10的背面设有四个磁铁30，用于将使用中的装置主体吸附在保护压板附近的金属体上。
装置主体10的前部设有三个外接端子接口：保护压板下端部外接端子接口11、地电位外接端子接口12、保护压板上端部外接端子接口13。保护压板下端部外接端子接口11通过线体用于连接保护压板下端部测试笔40、地电位外接端子接口12通过线体用于连接地电位测试夹50、保护压板上端部外接端子接口13通过线体用于连接保护压板上端部测试笔60。其中，测试时操作人员将地电位测试夹50直接夹持在地电位金属体上形成电位参考点；其后，左右手各手持测试笔40、测试笔60，分别接触保护压板上下端部获取其电位。
装置主体10尾部设有一个5VDC充电电源插口70，用于给装置主体10内置的锂电池充电。
如图2所示，装置主体10的内部电路中包含连接于保护压板下端部外接端子接口11的第一信号调理电路14，连接于压板上端部外接端子接口13的第二信号调理电路15，第一信号调理电路14包括依次串接的第一路电压变比电路141、第一路Sallen-Key有源低通滤波器142、第一路Σ-Δ型高精度ADC143。第二信号调理电路15包括依次串接的第二路电压变比模电路151、第二路Sallen-Key有源低通滤波器152、第二路Σ-Δ型高精度ADC153，第一路Σ-Δ型高精度ADC143与第二路Σ-Δ型高精度ADC153共同连接于一32位ARM单片机16，ARM单片机16连接于显示屏20。
在第一路Σ-Δ型高精度ADC143与第二路Σ-Δ型高精度ADC153之间还设置有一共用的高精度电压基准源17。共用的高精度电压基准源17，对两路独立的ADC能够保持相同的电压参考值，其受温度变化的影响能保持一致性，同时节省成本。
第一信号调理电路14与第二信号调理电路15各自独立，可以根据各自的输 入电压值配合程序自适应调整变比实现最佳的测量精度。
本装置在手持方式、夹持方式和电路结构上的改进，可以大大简化现有技术中变电站在投入保护压板前需要双人配合使用万用表分别两次测量保护压板上下端部电位的操作方式，实现了单人单次便捷操作，检测结果直观显示的优点。
以上结合附图和实施方式对本发明进行了展开描述，该描述不具有限制性，附图所示也只是本发明构成的实施例，本发明的技术方案并不局限于此。本领域的普通技术人员应该能够理解，在不脱离本发明设计思想的情况下，本发明的实际实施还会有某些细节上的变化。所以，只要符合本发明的宗旨，这些变化均包括在本发明的保护范围之内。

Claims (6)

  1. 一种保护压板电位便捷测量装置，其特征在于：包括装置主体、设置于装置主体前部的三个测试外接端子，所述其中一个测试外接端子通过线体连接一测试夹，所述测试夹用于连接地电位，所述另外两个测试外接端子分别通过线体连接用于与保护压板上下端部接触的电位测试笔，所述装置主体包括两路内置且独立的信号调理电路，所述信号调理电路分别与连有电位测试笔的测试外接端子连接，所述信号调理电路包括依次串接的电压变比切换电路、Sallen-Key有源低通滤波器及Σ-Δ型高精度ADC，所述两路信号调理电路的Σ-Δ型高精度ADC共同连接于一处理器，所述处理器连接一显示屏，所述两路信号调理电路的电压变比切换电路分别与连接有测试夹的测试外接端子电连接。
  2. 根据权利要求1所述的保护压板电位便捷测量装置，其特征在于：所述两路信号调理电路的Σ-Δ型高精度ADC之间还设置有一共用的高精度电压基准源。
  3. 根据权利要求1所述的保护压板电位便捷测量装置，其特征在于：所述处理器为一32位ARM单片机。
  4. 根据权利要求1所述的保护压板电位便捷测量装置，其特征在于：所述测试夹为可插拔测试夹，与地电位相连的一端为金属夹持部分。
  5. 根据权利要求1所述的保护压板电位便捷测量装置，其特征在于：所述装置主体背面设置有磁铁。
  6. 根据权利要求1所述的保护压板电位便捷测量装置，其特征在于：所述装置主体采用内置锂电池供电，并设有5VDC的充电接口。
PCT/CN2018/103991 2017-11-23 2018-09-04 一种保护压板电位便捷测量装置 WO2019100805A1 (zh)

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