CN104777405A - Passive voltage transformer secondary circuit N600 multipoint grounding finder and operation method thereof - Google Patents
Passive voltage transformer secondary circuit N600 multipoint grounding finder and operation method thereof Download PDFInfo
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Abstract
一种无源式电压互感器二次回路N600多点接地查找仪，包括N600端子连接线、接地线、接线柱O、接线柱O1、刀闸S、避雷器、电压表V、电流表A、刀闸S1、滑动变阻器R，查找仪设置在面板上，所述面板为EPE泡沫板，所述EPE泡沫板设有若干凿孔，将N600端子连接线、接地线、刀闸S、避雷器、电压表V、电流表A、刀闸S1、滑动变阻器R通过凿孔固定在面板上。本发明设置在面板上，内部结构和查找原理直观，若发生故障，排查难度比较小，造价比较低；本发明制作所用的材料常见，成本低廉，适合大规模生产应用。
A passive voltage transformer secondary circuit N600 multi-point grounding finder, including N600 terminal connection wire, ground wire, terminal O, terminal O1, knife switch S, lightning arrester, voltmeter V, ammeter A, knife switch S1, the sliding rheostat R, the finder is set on the panel, the panel is an EPE foam board, and the EPE foam board is provided with a number of drilling holes, the N600 terminal connection wire, ground wire, knife switch S, lightning arrester, voltmeter V , ammeter A, knife switch S1, and sliding rheostat R are fixed on the panel through holes. The invention is arranged on the panel, and the internal structure and search principle are intuitive. If a fault occurs, the difficulty of troubleshooting is relatively small, and the cost is relatively low; the materials used in the manufacture of the invention are common and low in cost, and are suitable for large-scale production and application.
Description
技术领域technical field
本发明涉及一种无源式电压互感器二次回路N600多点接地查找仪及其运行方法，属于电力系统检测设备技术领域。The invention relates to a passive voltage transformer secondary circuit N600 multi-point grounding finder and an operation method thereof, belonging to the technical field of power system detection equipment.
背景技术Background technique
变电站母线PT将一次的高电压按一定变比缩小为低等级的二次电压，然后接至电压并列屏，再从电压并列屏引出多条支路供保护、测控及计量仪表等装置。为保证人身及设备的安全，国家电网安规和国家电网公司十八项反措要求，电压互感器二次回路N600支路必须有且仅有一个接地点。若电压互感器二次回路N600支路存在多个接地点，则存在继电保护装置误动或拒动的风险。The substation busbar PT reduces the primary high voltage to a low-level secondary voltage according to a certain transformation ratio, and then connects it to the voltage parallel panel, and then leads multiple branches from the voltage parallel panel for protection, measurement and control, and metering devices. In order to ensure the safety of people and equipment, the State Grid Safety Regulations and the State Grid Corporation's eighteen countermeasures require that the N600 branch of the secondary circuit of the voltage transformer must have one and only one grounding point. If there are multiple grounding points in the N600 branch of the secondary circuit of the voltage transformer, there is a risk of the relay protection device malfunctioning or refusing to operate.
目前，常用的查找多点接地的方法是在变电站投运前解开接地点摇回路绝缘进行查找，对于已投运的变电站没有简易的查找方法，只能依据图纸逐屏逐地进行查找，耗时耗力，而且准确率难以保证。At present, the commonly used method to search for multi-point grounding is to untie the insulation of the grounding point and shake the circuit before the substation is put into operation. Time-consuming and labor-intensive, and accuracy is difficult to guarantee.
市场上有厂家研制出有源式电压互感器二次回路N600多点接地查找仪，它的工作原理是向回路注入一个低频直流电流信号，然后通过分流法来判断电压互感器二次回路N600的接地情况。经调查，向回路注入电流会使保护装置异常，有可能带来更大的安全隐患，会对运行的保护设备造成干扰，影响其正常运行，造成保护设备的误动作或拒动。Some manufacturers in the market have developed the active voltage transformer secondary circuit N600 multi-point grounding finder. Its working principle is to inject a low-frequency DC current signal into the circuit, and then use the shunt method to judge the voltage transformer secondary circuit N600. ground condition. After investigation, injecting current into the circuit will make the protection device abnormal, which may bring greater safety hazards, interfere with the running protection equipment, affect its normal operation, and cause the protection equipment to malfunction or refuse to operate.
市场上现有的多点接地故障检测装置主要利用数字电子技术实现查找功能，使用时，内部结构和查找原理不直观，若仪器发生故障，排查难度比较大，且该装置中包含有钳形电流互感器、检测器控制器、运算放大器、AD转换器、同步发射模块、同步接收模块等，造价比较高。The existing multi-point ground fault detection devices on the market mainly use digital electronic technology to realize the search function. When using it, the internal structure and search principle are not intuitive. If the instrument fails, it is difficult to troubleshoot. Transformers, detector controllers, operational amplifiers, AD converters, synchronous transmitting modules, synchronous receiving modules, etc., are relatively expensive.
中国专利文献CN202649370U公开了一种PT二次回路多点接地在线监测仪。该监测仪由PT二次回路的主控室一点接地连接线、避雷器F、毫安表A、小刀闸K以及滑线变阻器R组成；所述主控室一点接地连接线接在PT二次回路的主控室零相N600和二次等电位地网B之间；所述毫安表A、小刀闸K和滑线变阻器R依次串联后与所述主控室一点接地连接线并联；所述避雷器F接在主控室零相N600和二次等电位地网B之间。但是，该专利存在以下缺点：在毫安表A精度不高或故障时，不能确保查找的准确性。Chinese patent document CN202649370U discloses a PT secondary circuit multi-point grounding online monitor. The monitor is composed of one-point grounding connection line of the main control room of the PT secondary circuit, lightning arrester F, mA meter A, small knife switch K and sliding wire rheostat R; the one-point grounding connection line of the main control room is connected to the PT secondary circuit between the zero-phase N600 in the main control room and the secondary equipotential ground grid B; the milliampere meter A, the small knife switch K and the sliding wire rheostat R are connected in parallel with the one-point ground connection line in the main control room; The lightning arrester F is connected between the zero-phase N600 in the main control room and the secondary equipotential ground network B. However, this patent has the following disadvantages: when the accuracy of the milliampere meter A is not high or fails, the accuracy of the search cannot be guaranteed.
发明内容Contents of the invention
针对现有技术的不足，本发明公开了一种无源式电压互感器二次回路N600多点接地查找仪；Aiming at the deficiencies of the prior art, the present invention discloses a passive voltage transformer secondary circuit N600 multi-point grounding finder;
本发明还公开了上述查找仪的运行方法；The invention also discloses the operation method of the above-mentioned finder;
本发明增加了电压监视，若无源式电压互感器二次回路N600一点接地，则滑线变阻器R两端的电压会随着滑线变阻器R的电阻值的变化而变化，若N600存在多点接地，则滑线变阻器R相当于被其他接地点短路，两端的电压基本不变；在电流表A精度不高或故障时，确保查找的准确性；同时，从刀闸S1外接电流表校验电流表A的精度，从刀闸S外接电压表校验电压表V的精度。The invention adds voltage monitoring. If the secondary circuit N600 of the passive voltage transformer is grounded at one point, the voltage at both ends of the sliding wire rheostat R will change with the change of the resistance value of the sliding wire rheostat R. If N600 has multi-point grounding , then the sliding wire rheostat R is equivalent to being short-circuited by other grounding points, and the voltage at both ends remains basically unchanged; when the accuracy of ammeter A is not high or fails, ensure the accuracy of the search; Accuracy, the accuracy of the voltmeter V is verified by an external voltmeter from the switch S.
本发明为一种耗资少、操作简单、安全可靠的无源式查找仪，通过测量系统中的某些电量来判断N600的接地情况，避免了给变电站带来其他安全隐患。The invention is a passive finder with low cost, simple operation, safety and reliability, which judges the grounding condition of the N600 by measuring certain electric quantities in the system, and avoids other hidden dangers to the substation.
本发明的技术方案为：Technical scheme of the present invention is:
一种无源式电压互感器二次回路N600多点接地查找仪，包括N600端子连接线、接地线、接线柱O、接线柱O1、刀闸S、避雷器、电压表V、电流表A、刀闸S1、滑动变阻器R，所述接线柱O设置在电压互感器二次回路N600一端，所述接线柱O1设置在二次等电位地网一端，所述N600端子连接线活动连接所述接线柱O，所述接地线活动连接所述接线柱O1，所述刀闸S接在电压互感器二次回路N600与二次等电位地网之间，所述避雷器接在电压互感器二次回路N600与二次等电位地网之间，所述电压表V接在电压互感器二次回路N600与二次等电位地网之间，所述电流表A、所述刀闸S1、所述滑动变阻器R依次串联后与所述刀闸S并联，所述查找仪设置在面板上。A passive voltage transformer secondary circuit N600 multi-point grounding finder, including N600 terminal connection wire, ground wire, terminal O, terminal O1, knife switch S, lightning arrester, voltmeter V, ammeter A, knife switch S1, sliding rheostat R, the terminal O is set at one end of the secondary circuit N600 of the voltage transformer, the terminal O1 is set at one end of the secondary equipotential ground network, and the connecting line of the N600 terminal is movably connected to the terminal O , the ground wire is movably connected to the terminal O1, the switch S is connected between the voltage transformer secondary circuit N600 and the secondary equipotential ground network, and the lightning arrester is connected between the voltage transformer secondary circuit N600 and the secondary equipotential ground network. Between the secondary equipotential ground network, the voltmeter V is connected between the voltage transformer secondary circuit N600 and the secondary equipotential ground network, the ammeter A, the knife switch S1, and the sliding rheostat R are sequentially After being connected in series, it is connected in parallel with the switch S, and the finder is set on the panel.
根据本发明优选的，所述面板为EPE泡沫板，所述EPE泡沫板设有若干凿孔，所述刀闸S、所述避雷器、所述电压表V、所述电流表A、所述刀闸S1、所述滑动变阻器R通过所述凿孔固定在所述面板上，所述面板上固定设置有所述接线柱O及所述接线柱O1。Preferably according to the present invention, the panel is an EPE foam board, and the EPE foam board is provided with a number of holes, the knife switch S, the lightning arrester, the voltmeter V, the ammeter A, the knife switch S1. The sliding rheostat R is fixed on the panel through the hole, and the terminal O and the terminal O1 are fixedly arranged on the panel.
此处设计的优势在于，该查找仪内部结构和查找原理直观，若发生故障，排查难度比较小，造价比较低。The advantage of the design here is that the internal structure and search principle of the finder are intuitive, and if a fault occurs, the difficulty of troubleshooting is relatively small and the cost is relatively low.
根据本发明优选的，所述接线柱O、所述接线柱O1、所述刀闸S、所述避雷器、所述电压表V、所述电流表A、所述刀闸S1、所述滑动变阻器R通过端子排连接。Preferably according to the present invention, the terminal O, the terminal O1, the knife switch S, the lightning arrester, the voltmeter V, the ammeter A, the knife switch S1, the sliding rheostat R Connection via terminal block.
此处设计的优势在于，接线柱O、接线柱O1、刀闸S、避雷器、电压表V、电流表A、刀闸S1、滑动变阻器R通过端子排连接，使连接更紧固，方便查线，避免挤压和断线。The advantage of the design here is that terminal O, terminal O1, knife switch S, lightning arrester, voltmeter V, ammeter A, knife switch S1, and sliding rheostat R are connected through terminal blocks, which makes the connection more secure and facilitates line inspection. Avoid pinching and breaking wires.
根据本发明优选的，所述接地线、所述N600端子连接线均为电流试验线，所述接地线、所述N600端子连接线的线径均为4mm，耐压均为3kV，流经最大电流均为50A。Preferably according to the present invention, the grounding wire and the N600 terminal connecting wire are both current test wires, the wire diameters of the grounding wire and the N600 terminal connecting wire are both 4mm, the withstand voltage is 3kV, and the maximum The current is 50A.
根据本发明优选的，所述接线柱O、所述接线柱O1、所述刀闸S及所述刀闸S1均为保护压板。Preferably, according to the present invention, the terminal O, the terminal O1, the knife switch S and the knife switch S1 are all protective pressure plates.
此处设计的优势在于，保护压板具有导通性和开断性，并且体积轻、价格便宜。The advantage of the design here is that the protective pressure plate has continuity and breakability, and it is light in size and cheap in price.
根据本发明优选的，所述刀闸S及所述刀闸S1的额定电压均为220V，所述刀闸S及所述刀闸S1的额定电流均为24A。Preferably, according to the present invention, the rated voltage of the knife switch S and the knife switch S1 are both 220V, and the rated current of the knife switch S and the knife switch S1 are both 24A.
根据本发明优选的，所述电流表A为数字式电流表，所述电流表A的精度为0.5％，所述电流表A的量程0-200mA。Preferably according to the present invention, the ammeter A is a digital ammeter, the accuracy of the ammeter A is 0.5%, and the range of the ammeter A is 0-200mA.
根据本发明优选的，所述电压表V为指针式电压表，所述电压表V的精度为2.5％，所述电压表V的量程为0-10V。Preferably according to the present invention, the voltmeter V is a pointer voltmeter, the accuracy of the voltmeter V is 2.5%, and the range of the voltmeter V is 0-10V.
根据本发明优选的，所述滑动变阻器R为磁盘可调变阻器，所述滑动变阻器R的阻值范围为0-20Ω。Preferably, according to the present invention, the sliding rheostat R is a disk adjustable rheostat, and the resistance value of the sliding rheostat R ranges from 0-20Ω.
此处设计的优势在于，所述磁盘可调变阻器具有以下优点：表面采用经过氧化绝缘处理的康铜丝，密绕于瓷管上，连接可靠；圆盘式结构容易固定于面板上；价格便宜。The advantage of the design here is that the disk adjustable rheostat has the following advantages: the surface is made of constantan wire that has been oxidized and insulated, tightly wound on the porcelain tube, and the connection is reliable; the disc structure is easy to fix on the panel; the price is cheap .
上述查找仪的运行方法，具体步骤包括：The operation method of the above-mentioned finder, the specific steps include:
(1)将所述N600端子连接线连接所述接线柱O，将所述接地线连接所述接线柱O1，将所述接地线接地，将所述N600端子连接线接N600端子；合上所述刀闸S，解开所述主控室一点接地连接线；(1) Connect the connecting wire of the N600 terminal to the terminal O, connect the grounding wire to the terminal O1, connect the grounding wire to the ground, connect the connecting wire of the N600 terminal to the N600 terminal; close the Said knife switch S, untied one point ground connection wire of said main control room;
(2)调整所述滑动变阻器R，使所述滑动变阻器R电阻值为0，合上所述刀闸S1，断开所述刀闸S，记录所述电压表V及所述电流表A的读数；(2) Adjust the sliding rheostat R so that the resistance value of the sliding rheostat R is 0, close the knife switch S 1 , disconnect the knife switch S, and record the values of the voltmeter V and the ammeter A reading;
(3)不断增加所述滑动变阻器R电阻值，并实时记录所述电压表V及所述电流表A的读数，得到一组电压值和一组电流值；(3) continuously increase the resistance value of the sliding rheostat R, and record the readings of the voltmeter V and the ammeter A in real time to obtain a set of voltage values and a set of current values;
(4)对比、分析步骤(3)记录的一组电压值和一组电流值,若该组电流值发生改变，该组电压值基本不发生改变，则判定PT二次回路N600存在两点或多点接地；若该组电流值不发生改变，该组电压值发生改变，则判定PT二次回路N600只有一点接地。(4) Compare and analyze a set of voltage values and a set of current values recorded in step (3). If the set of current values changes and the set of voltage values basically does not change, it is determined that there are two points or Multi-point grounding; if the current value of the group does not change, but the voltage value of the group changes, it is determined that the PT secondary circuit N600 is only grounded at one point.
本发明的有益效果为：The beneficial effects of the present invention are:
1、所述查找仪设置在面板上，内部结构和查找原理直观，若发生故障，排查难度比较小，造价比较低；1. The searcher is set on the panel, and the internal structure and search principle are intuitive. If a fault occurs, the difficulty of troubleshooting is relatively small, and the cost is relatively low;
2、无源式N600多点接地查找仪在10分钟内判断是否存在多点接地，如不存在，则无需查找回路，如存在多余接地，可利用钳形电流表配合查找，大大缩短了查找时间；2. The passive N600 multi-point grounding finder can judge whether there is a multi-point grounding within 10 minutes. If there is no multi-point grounding, there is no need to search for the loop. If there is a redundant grounding, you can use the clamp ammeter to cooperate with the search, which greatly shortens the search time;
3、无源式N600多点接地查找仪的使用提高了查找N600回路多点接地准确性，消除了已投运变电站由于N600多点接地引起保护不正确动作的安全隐患；3. The use of passive N600 multi-point grounding finder improves the accuracy of finding N600 loop multi-point grounding, and eliminates the potential safety hazard of incorrect protection action caused by N600 multi-point grounding in substations that have been put into operation;
4、本发明种耗资少、操作简单、实用性强、安全可靠，通过测量系统中的某些电量来判断N600的接地情况，避免了给变电站带来其他安全隐患；4. The invention has the advantages of low cost, simple operation, strong practicability, safety and reliability, and judges the grounding condition of the N600 by measuring certain electric quantities in the system, avoiding other potential safety hazards to the substation;
5、本发明制作所用的材料常见，成本低廉，适合大规模生产应用。5. The materials used in the manufacture of the present invention are common, low in cost, and suitable for large-scale production and application.
附图说明Description of drawings
图1为实施例1中本发明设置在面板上正面各器件分布图；Fig. 1 is the distribution diagram of each device on the front side of the panel according to the present invention in embodiment 1;
图2为实施例1中本发明设置在面板上反面各器件分布图；Fig. 2 is the distribution diagram of each device arranged on the reverse side of the panel in the present invention in embodiment 1;
图1、图2中，各器件按照图中标注的距离分布，结构合理美观整齐。In Figure 1 and Figure 2, each device is distributed according to the distance marked in the figure, and the structure is reasonable, beautiful and tidy.
图3为本发明的电路原理图。Fig. 3 is a schematic circuit diagram of the present invention.
具体实施方式Detailed ways
下面结合说明书附图和实施例对本发明作进一步限定，但不限于此。The present invention will be further limited below in conjunction with the accompanying drawings and embodiments, but not limited thereto.
实施例1Example 1
一种无源式电压互感器二次回路N600多点接地查找仪，包括N600端子连接线、接地线、接线柱O、接线柱O1、刀闸S、避雷器、电压表V、电流表A、刀闸S1、滑动变阻器R，所述接线柱O设置在电压互感器二次回路N600一端，所述接线柱O1设置在二次等电位地网一端，所述N600端子连接线活动连接所述接线柱O，所述接地线活动连接所述接线柱O1，所述刀闸S接在电压互感器二次回路N600与二次等电位地网之间，所述避雷器接在电压互感器二次回路N600与二次等电位地网之间，所述电压表V接在电压互感器二次回路N600与二次等电位地网之间，所述电流表A、所述刀闸S1、所述滑动变阻器R依次串联后与所述刀闸S并联，所述查找仪设置在面板上。A passive voltage transformer secondary circuit N600 multi-point grounding finder, including N600 terminal connection wire, ground wire, terminal O, terminal O1, knife switch S, lightning arrester, voltmeter V, ammeter A, knife switch S1, sliding rheostat R, the terminal O is set at one end of the secondary circuit N600 of the voltage transformer, the terminal O1 is set at one end of the secondary equipotential ground network, and the connecting line of the N600 terminal is movably connected to the terminal O , the ground wire is movably connected to the terminal O1, the switch S is connected between the voltage transformer secondary circuit N600 and the secondary equipotential ground network, and the lightning arrester is connected between the voltage transformer secondary circuit N600 and the secondary equipotential ground network. Between the secondary equipotential ground network, the voltmeter V is connected between the voltage transformer secondary circuit N600 and the secondary equipotential ground network, the ammeter A, the knife switch S1, and the sliding rheostat R are sequentially After being connected in series, it is connected in parallel with the switch S, and the finder is set on the panel.
所述面板为EPE泡沫板，所述EPE泡沫板设有若干凿孔，所述刀闸S、所述避雷器、所述电压表V、所述电流表A、所述刀闸S1、所述滑动变阻器R通过所述凿孔固定在所述面板上，所述面板上固定设置有所述接线柱O及所述接线柱O1。The panel is an EPE foam board, and the EPE foam board is provided with a number of drilled holes, the knife switch S, the lightning arrester, the voltmeter V, the ammeter A, the knife switch S1, the sliding rheostat R is fixed on the panel through the hole, and the terminal O and the terminal O1 are fixedly arranged on the panel.
此处设计的优势在于，该查找仪内部结构和查找原理直观，若发生故障，排查难度比较小，造价比较低。The advantage of the design here is that the internal structure and search principle of the finder are intuitive, and if a fault occurs, the difficulty of troubleshooting is relatively small and the cost is relatively low.
所述接线柱O、所述接线柱O1、所述刀闸S、所述避雷器、所述电压表V、所述电流表A、所述刀闸S1、所述滑动变阻器R通过端子排连接。The terminal O, the terminal O1, the switch S, the arrester, the voltmeter V, the ammeter A, the switch S1, and the sliding rheostat R are connected through a terminal block.
此处设计的优势在于，接线柱O、接线柱O1、刀闸S、避雷器、电压表V、电流表A、刀闸S1、滑动变阻器R通过端子排连接，使连接更紧固，方便查线，避免挤压和断线。The advantage of the design here is that terminal O, terminal O1, knife switch S, lightning arrester, voltmeter V, ammeter A, knife switch S1, and sliding rheostat R are connected through terminal blocks, which makes the connection more secure and facilitates line inspection. Avoid pinching and breaking wires.
所述接地线、所述N600端子连接线均为电流试验线，所述接地线、所述N600端子连接线的线径均为4mm，耐压均为3kV，流经最大电流均为50A。The grounding wire and the N600 terminal connecting wire are current test wires, the diameter of the grounding wire and the N600 terminal connecting wire are both 4mm, the withstand voltage is 3kV, and the maximum current flowing through them is 50A.
实施例2Example 2
根据实施例1所述查找仪，其区别在于，所述接线柱O、所述接线柱O1、所述刀闸S及所述刀闸S1均为保护压板。According to the finder described in Embodiment 1, the difference is that the terminal O, the terminal O1, the knife switch S and the knife switch S1 are all protective pressure plates.
此处设计的优势在于，保护压板具有导通性和开断性，并且体积轻、价格便宜。The advantage of the design here is that the protective pressure plate has continuity and breakability, and it is light in size and cheap in price.
实施例3Example 3
根据实施例1所述一种无源式电压互感器二次回路N600多点接地查找仪，其区别在于，所述刀闸S及所述刀闸S1的额定电压均为220V，所述刀闸S及所述刀闸S1的额定电流均为24A。According to the passive voltage transformer secondary circuit N600 multi-point grounding finder described in Embodiment 1, the difference is that the rated voltages of the knife switch S and the knife switch S1 are both 220V, and the knife switch The rated currents of S and the switch S1 are both 24A.
实施例4Example 4
根据实施例1所述一种无源式电压互感器二次回路N600多点接地查找仪，其区别在于，所述电流表A为数字式电流表，所述电流表A的精度为0.5％，所述电流表A的量程0-200mA。According to a passive voltage transformer secondary circuit N600 multi-point grounding finder described in Embodiment 1, the difference is that the ammeter A is a digital ammeter, the accuracy of the ammeter A is 0.5%, and the ammeter The range of A is 0-200mA.
实施例5Example 5
根据实施例1所述一种无源式电压互感器二次回路N600多点接地查找仪，其区别在于，所述电压表V为指针式电压表，所述电压表V的精度为2.5％，所述电压表V的量程为0-10V。According to a passive voltage transformer secondary circuit N600 multi-point grounding finder described in Embodiment 1, the difference is that the voltmeter V is a pointer voltmeter, and the accuracy of the voltmeter V is 2.5%. The range of the voltmeter V is 0-10V.
实施例6Example 6
根据实施例1所述一种无源式电压互感器二次回路N600多点接地查找仪，其区别在于，所述滑动变阻器R为磁盘可调变阻器，所述滑动变阻器R的阻值范围为0-20Ω。According to the passive voltage transformer secondary circuit N600 multi-point grounding finder described in Embodiment 1, the difference is that the sliding rheostat R is a disk adjustable rheostat, and the resistance range of the sliding rheostat R is 0 -20Ω.
此处设计的优势在于，所述磁盘可调变阻器具有以下优点：表面采用经过氧化绝缘处理的康铜丝，密绕于瓷管上，连接可靠；圆盘式结构容易固定于面板上；价格便宜。The advantage of the design here is that the disk adjustable rheostat has the following advantages: the surface is made of constantan wire that has been oxidized and insulated, tightly wound on the porcelain tube, and the connection is reliable; the disc structure is easy to fix on the panel; the price is cheap .
实施例7Example 7
上述实施例1-6任一所述查找仪的运行方法，具体步骤包括：The operation method of the finder described in any one of the above-mentioned embodiments 1-6, the specific steps include:
(1)将所述N600端子连接线连接所述接线柱O，将所述接地线连接所述接线柱O1，将所述接地线接地，将所述N600端子连接线接N600端子；合上所述刀闸S，解开所述主控室一点接地连接线；(1) Connect the connecting wire of the N600 terminal to the terminal O, connect the grounding wire to the terminal O1, connect the grounding wire to the ground, connect the connecting wire of the N600 terminal to the N600 terminal; close the Said knife switch S, untied one point ground connection wire of said main control room;
(2)调整所述滑动变阻器R，使所述滑动变阻器R电阻值为0，合上所述刀闸S1，断开所述刀闸S，记录所述电压表V及所述电流表A的读数；(2) Adjust the sliding rheostat R so that the resistance value of the sliding rheostat R is 0, close the knife switch S 1 , disconnect the knife switch S, and record the values of the voltmeter V and the ammeter A reading;
(3)不断增加所述滑动变阻器R电阻值，并实时记录所述电压表V及所述电流表A的读数，得到一组电压值和一组电流值；(3) continuously increase the resistance value of the sliding rheostat R, and record the readings of the voltmeter V and the ammeter A in real time to obtain a set of voltage values and a set of current values;
(4)对比、分析步骤(3)记录的一组电压值和一组电流值,若该组电流值发生改变，该组电压值基本不发生改变，则判定PT二次回路N600存在两点或多点接地；若该组电流值不发生改变，该组电压值发生改变，则判定PT二次回路N600只有一点接地。(4) Compare and analyze a set of voltage values and a set of current values recorded in step (3). If the set of current values changes and the set of voltage values basically does not change, it is determined that there are two points or Multi-point grounding; if the current value of the group does not change, but the voltage value of the group changes, it is determined that the PT secondary circuit N600 is only grounded at one point.
现场验证：在新范庄站(该站已基建完毕，但2014年无投运计划)进行模拟试验。将35kV范郑线312间隔柜的N600接地，在110kV电压并列及备自投柜处，将本发明的所述接地线接地，将所述N600端子连接线接N600端子，合上刀闸S，解下110kV电压并列及备自投柜处N600一点接地连接线，测试时，合上刀闸S1，断开刀闸S，将滑线变阻器R由0Ω调到20Ω，电流值由36mA变为了4mA，电压表示数基本保持不变，此时说明除110kV电压并列及备自投柜一点接地外还存在其它接地点；拆开35kV范郑线312间隔柜二次回路处的接地线，将滑线变阻器R由0Ω调到20Ω，电压值由7mV变为71mV,电流值基本不变，此时说明不存在多点接地。On-site verification: a simulation test is carried out at Xinfanzhuang Station (the infrastructure construction of which has been completed, but there is no plan to put it into operation in 2014). Ground the N600 of the 312 partition cabinet of the 35kV Fanzheng line, and ground the ground wire of the present invention at the 110kV voltage parallel and self-injection cabinet, connect the N600 terminal connecting wire to the N600 terminal, close the knife switch S, Untie the 110kV voltage parallel and the N600 one-point grounding cable at the self-transfer cabinet. During the test, close the switch S1, disconnect the switch S, adjust the sliding wire rheostat R from 0Ω to 20Ω, and the current value changes from 36mA to 4mA , the number of voltage indications basically remains unchanged. At this time, there are other grounding points besides the parallel 110kV voltage and one point grounding of the standby self-injection cabinet; disassemble the grounding wire at the secondary circuit of the 312 partition cabinet of the 35kV Fanzheng line, and slide the wire The rheostat R is adjusted from 0Ω to 20Ω, the voltage value is changed from 7mV to 71mV, and the current value is basically unchanged, which means that there is no multi-point grounding.
Claims (10)
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