CN105571795B - A kind of GIS principal faults diagnostic system and method - Google Patents
A kind of GIS principal faults diagnostic system and method Download PDFInfo
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Abstract
本发明公开了一种GIS漏气故障诊断系统及方法，系统包括温度传感器、气压传感器、分布电容测量模块、信号调理电路、AD采样器、控制器和报警模块，温度传感器、气压传感器和分布电容测量模块分别采集环境温度信号、气室内气压信号以及气室导电杆与外壳之间的分布电容信号并传送给信号调理电路，AD采样器采样经过信号调理的信号并传送给控制器，控制器根据接收到的信号判断GIS气室是否漏气，并根据判断结果控制报警模块工作。本发明克服了现有GIS气室漏气故障诊断技术存在的缺陷，消除了环境温度对GIS气室漏气故障诊断的干扰。
The invention discloses a GIS air leakage fault diagnosis system and method. The system includes a temperature sensor, an air pressure sensor, a distributed capacitance measurement module, a signal conditioning circuit, an AD sampler, a controller and an alarm module, a temperature sensor, an air pressure sensor and a distributed capacitance The measurement module separately collects the ambient temperature signal, the air pressure signal in the air chamber and the distributed capacitance signal between the conductive rod of the air chamber and the shell and transmits it to the signal conditioning circuit. The AD sampler samples the signal conditioned signal and transmits it to the controller. The controller according to The received signal judges whether the GIS air chamber is leaking, and controls the alarm module to work according to the judgment result. The invention overcomes the defects existing in the existing GIS air chamber leakage fault diagnosis technology, and eliminates the interference of ambient temperature on the GIS air chamber air leakage fault diagnosis.
Description
技术领域technical field
本发明属于智能变电站技术领域，特别涉及了一种GIS漏气故障诊断系统及方法。The invention belongs to the technical field of intelligent substations, and in particular relates to a GIS air leakage fault diagnosis system and method.
背景技术Background technique
气体绝缘组合电器(Gas Insulated Switchgear，简称GIS)是把变电所里各种电气设备除变压器外全部组合装配在一个封闭的金属外壳里，GIS气室内充有一定压强的SF6气体，以实现导体对外壳、相间以及断口间的可靠绝缘。因而GIS具有结构紧凑、运行可靠性高和安装方便等优点。Gas Insulated Switchgear (GIS for short) is to combine and assemble all kinds of electrical equipment in the substation except the transformer in a closed metal shell, and the GIS gas chamber is filled with SF 6 gas at a certain pressure to realize Reliable insulation of conductors to shells, between phases and between fractures. Therefore, GIS has the advantages of compact structure, high operational reliability and convenient installation.
GIS气室一般装有气体压力传感器，当有气体泄漏时，GIS气室压强减小，一般情况下是可以判别漏气故障的。但是根据气体状态方程，导致一定体积的气室SF6压强变化因素中除了漏气还有温度。此外GIS导电杆与外壳为同轴结构，二者之间存在分布电容，且电解质为SF6气体，若气室漏气SF6气压减小，SF6的介电常数改变，因此可以基于分布电容的变化实现气室漏气故障的监测。实际上气体的介电常数不但与压力有关，温度也是影响其介电常数的重要因数。The GIS gas chamber is generally equipped with a gas pressure sensor. When there is a gas leak, the pressure of the GIS gas chamber will decrease. Generally, the gas leakage fault can be judged. However, according to the gas state equation, in addition to air leakage and temperature, the factors causing the pressure change of a certain volume of gas chamber SF 6 are also temperature. In addition, the GIS conductive rod and the shell are coaxial structures, there is distributed capacitance between them, and the electrolyte is SF 6 gas, if the gas chamber leaks, the SF 6 pressure decreases, and the dielectric constant of SF 6 changes, so it can be based on the distributed capacitance The change realizes the monitoring of gas chamber leakage fault. In fact, the dielectric constant of gas is not only related to pressure, but temperature is also an important factor affecting its dielectric constant.
现实中，一年内各季度的温差很大，特别是个别地区一天内的气温变化很大，这将影响GIS气室漏气的监测的准确性和灵敏性。为此需要一种可消除气温变化的GIS气室漏气故障检测方法。In reality, there are large temperature differences between seasons in a year, especially in individual areas within a day, which will affect the accuracy and sensitivity of GIS air chamber leakage monitoring. Therefore, a GIS gas chamber air leakage fault detection method that can eliminate air temperature changes is needed.
发明内容Contents of the invention
为了解决上述背景技术提出的技术问题，本发明旨在提供一种GIS漏气故障诊断系统及方法，克服现有GIS气室漏气故障诊断技术存在的缺陷，消除环境温度对GIS气室漏气故障诊断的干扰。In order to solve the technical problems proposed by the above-mentioned background technology, the present invention aims to provide a GIS air leakage fault diagnosis system and method, which overcomes the defects in the existing GIS air chamber air leakage fault diagnosis technology, and eliminates the influence of ambient temperature on the GIS air chamber air leakage. interference with fault diagnosis.
为了实现上述技术目的，本发明的技术方案为：In order to realize above-mentioned technical purpose, technical scheme of the present invention is:
一种GIS漏气故障诊断系统，包括温度传感器、气压传感器、分布电容测量模块、信号调理电路、AD采样器、控制器和报警模块，所述气压传感器和分布电容测量模块设置在GIS气室内，温度传感器、气压传感器、分布电容测量模块的输出端分别与信号调理电路的输入端相连，AD采样器的输入端连接信号调理电路的输出端，控制器分别连接AD采样器的输出端和报警模块；所述温度传感器、气压传感器和分布电容测量模块分别采集环境温度信号、气室内气压信号以及气室导电杆与外壳之间的分布电容信号并传送给信号调理电路，AD采样器采样经过信号调理的信号并传送给控制器，控制器根据接收到的信号判断GIS气室是否漏气，并根据判断结果控制报警模块工作。A GIS air leakage fault diagnosis system, comprising a temperature sensor, an air pressure sensor, a distributed capacitance measurement module, a signal conditioning circuit, an AD sampler, a controller and an alarm module, the air pressure sensor and the distributed capacitance measurement module are arranged in the GIS air chamber, The output terminals of the temperature sensor, air pressure sensor and distributed capacitance measurement module are respectively connected to the input terminal of the signal conditioning circuit, the input terminal of the AD sampler is connected to the output terminal of the signal conditioning circuit, and the controller is respectively connected to the output terminal of the AD sampler and the alarm module The temperature sensor, the air pressure sensor and the distributed capacitance measurement module collect the ambient temperature signal, the air pressure signal in the gas chamber and the distributed capacitance signal between the conductive rod of the gas chamber and the shell respectively and transmit it to the signal conditioning circuit, and the AD sampler samples through signal conditioning The signal is transmitted to the controller, and the controller judges whether the GIS air chamber is leaking according to the received signal, and controls the alarm module to work according to the judgment result.
进一步地，所述信号调理电路包括放大电路和滤波电路，放大电路的输入端连接温度传感器、气压传感器和分布电容测量模块的输出端，放大电路的输出端连接滤波电路的输入端，滤波电路的输出端连接AD采样器的输入端。Further, the signal conditioning circuit includes an amplifying circuit and a filtering circuit, the input end of the amplifying circuit is connected to the output end of the temperature sensor, the air pressure sensor and the distributed capacitance measurement module, the output end of the amplifying circuit is connected to the input end of the filtering circuit, and the input end of the filtering circuit The output terminal is connected to the input terminal of the AD sampler.
进一步地，所述报警模块包括分别与控制器相连的LED和蜂鸣器。Further, the alarm module includes an LED and a buzzer respectively connected to the controller.
进一步地，所述控制器采用ARM处理器。Further, the controller adopts an ARM processor.
本发明还包括一种GIS漏气故障诊断方法，包括以下步骤：The present invention also includes a GIS air leakage fault diagnosis method, comprising the following steps:
(1)测量常温t0下GIS气室的压强P0以及气室导电杆与外壳之间的分布电容C0的数值，并保存；(1) Measure the pressure P0 of the GIS gas chamber at normal temperature t0 and the value of the distributed capacitance C0 between the conductive rod of the gas chamber and the shell, and save it;
(2)测取当前时刻温度t下GIS气室的压强P和气室导电杆与外壳之间的分布电容C；(2) Measure the pressure P of the GIS gas chamber at the current moment temperature t and the distributed capacitance C between the conductive rod of the gas chamber and the shell;
(3)计算气室压强的理论值：P0×t/t0，计算气室导电杆与外壳之间的分布电容的理论值：kc×C0，其中系数kc为：(3) Calculate the theoretical value of the gas chamber pressure: P 0 ×t/t 0 , calculate the theoretical value of the distributed capacitance between the conductive rod of the gas chamber and the shell: k c ×C 0 , where the coefficient k c is:
式(1)中，k为波尔斯曼常数，k＝1.38×10-23J/K，α为GIS气室内SF6气体分子半径；In the formula (1), k is Bollsmann's constant, k=1.38×10 -23 J/K, α is the molecular radius of SF 6 gas in the GIS gas chamber;
(4)若P-P0×t/t0<0，且C-kc×C0<0，则判断气室漏气；若P-P0×t/t0＝0，且C-kc×C0＝0，则判断气室未漏气。(4) If PP 0 ×t/t 0 <0, and Ck c ×C 0 <0, it is judged that the gas chamber leaks; if PP 0 ×t/t 0 =0, and Ck c ×C 0 =0, Then it is judged that the air chamber is not leaking.
采用上述技术方案带来的有益效果：The beneficial effect brought by adopting the above-mentioned technical scheme:
本发明根据温度对气室SF6气体压强和介电常数的影响，计算出时测温度下气室未故障的对应的压强和分布电容，然后与实测的气室压强和分布电容值作对比，实现气室漏气故障判别。本发明可消除GIS运行时气温变化对气室漏气故障识别的影响，有压强和分布电容两个特征量，提高故障判别的准确性。According to the influence of temperature on the gas chamber SF6 gas pressure and dielectric constant, the present invention calculates the corresponding pressure and distributed capacitance of the unfailed gas chamber at the measured temperature, and then compares it with the measured gas chamber pressure and distributed capacitance value, Realize air chamber leak fault discrimination. The invention can eliminate the influence of the air temperature change on the air leakage fault identification of the air chamber when the GIS is running, has two characteristic quantities of pressure and distributed capacitance, and improves the accuracy of fault discrimination.
附图说明Description of drawings
图1是本发明的系统组成框图；Fig. 1 is a system composition block diagram of the present invention;
图2是本发明的方法流程图。Fig. 2 is a flow chart of the method of the present invention.
具体实施方式Detailed ways
以下将结合附图，对本发明的技术方案进行详细说明。The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
如图1所示本发明的系统组成框图，一种GIS漏气故障诊断系统，包括温度传感器、气压传感器、分布电容测量模块、信号调理电路、AD采样器、控制器和报警模块，所述气压传感器和分布电容测量模块设置在GIS气室内，温度传感器、气压传感器、分布电容测量模块的输出端分别与信号调理电路的输入端相连，AD采样器的输入端连接信号调理电路的输出端，控制器分别连接AD采样器的输出端和报警模块；所述温度传感器、气压传感器和分布电容测量模块分别采集环境温度信号、气室内气压信号以及气室导电杆与外壳之间的分布电容信号并传送给信号调理电路，AD采样器采样经过信号调理的信号并传送给控制器，控制器根据接收到的信号判断GIS气室是否漏气，并根据判断结果控制报警模块工作。System composition block diagram of the present invention as shown in Figure 1, a kind of GIS air leakage fault diagnosis system, comprises temperature sensor, air pressure sensor, distributed capacitance measurement module, signal conditioning circuit, AD sampler, controller and alarm module, described air pressure The sensor and the distributed capacitance measurement module are set in the GIS gas chamber, the output terminals of the temperature sensor, the air pressure sensor, and the distributed capacitance measurement module are respectively connected to the input terminal of the signal conditioning circuit, and the input terminal of the AD sampler is connected to the output terminal of the signal conditioning circuit. The sensor is respectively connected to the output terminal of the AD sampler and the alarm module; the temperature sensor, the air pressure sensor and the distributed capacitance measurement module respectively collect the ambient temperature signal, the air pressure signal in the gas chamber, and the distributed capacitance signal between the conductive rod of the gas chamber and the shell and transmit the For the signal conditioning circuit, the AD sampler samples the conditioned signal and sends it to the controller. The controller judges whether the GIS air chamber is leaking according to the received signal, and controls the alarm module to work according to the judgment result.
在本实施例中，信号调理电路包括放大电路和滤波电路，放大电路的输入端连接温度传感器、气压传感器和分布电容测量模块的输出端，放大电路的输出端连接滤波电路的输入端，滤波电路的输出端连接AD采样器的输入端。In this embodiment, the signal conditioning circuit includes an amplifying circuit and a filtering circuit, the input end of the amplifying circuit is connected to the output end of the temperature sensor, the air pressure sensor and the distributed capacitance measurement module, the output end of the amplifying circuit is connected to the input end of the filtering circuit, and the filtering circuit The output terminal of the AD sampler is connected to the input terminal.
在本实施例中，报警模块包括分别与控制器相连的LED和蜂鸣器，当控制器判断GIS气室漏气时，驱动LED闪烁、蜂鸣器鸣叫。In this embodiment, the alarm module includes an LED and a buzzer respectively connected to the controller. When the controller judges that the GIS air chamber is leaking, it drives the LED to flash and the buzzer to sound.
在本实施例中，所述控制器采用ARM处理器。In this embodiment, the controller uses an ARM processor.
本发明还包括一种GIS漏气故障诊断方法，如图2所示，包括以下步骤：The present invention also includes a GIS air leakage fault diagnosis method, as shown in Figure 2, comprising the following steps:
(1)测量常温t0下GIS气室的压强P0以及气室导电杆与外壳之间的分布电容C0的数值，并保存；(1) Measure the pressure P0 of the GIS gas chamber at normal temperature t0 and the value of the distributed capacitance C0 between the conductive rod of the gas chamber and the shell, and save it;
(2)测取当前时刻温度t下GIS气室的压强P和气室导电杆与外壳之间的分布电容C；(2) Measure the pressure P of the GIS gas chamber at the current moment temperature t and the distributed capacitance C between the conductive rod of the gas chamber and the shell;
(3)计算气室压强的理论值：P0×t/t0，计算室导电杆与外壳之间的分布电容的理论值：kc×C0，其中系数kc为：(3) Calculate the theoretical value of the air chamber pressure: P 0 ×t/t 0 , and calculate the theoretical value of the distributed capacitance between the conductive rod and the shell of the calculation chamber: k c ×C 0 , where the coefficient k c is:
式(1)中，k为波尔斯曼常数，k＝1.38×10-23J/K，α为GIS气室内SF6气体分子半径；In the formula (1), k is Bollsmann's constant, k=1.38×10 -23 J/K, α is the molecular radius of SF 6 gas in the GIS gas chamber;
(4)若P-P0×t/t0<0，且C-kc×C0<0，则判断气室漏气；若P-P0×t/t0＝0，且C-kc×C0＝0，则判断气室未漏气。(4) If PP 0 ×t/t 0 <0, and Ck c ×C 0 <0, it is judged that the gas chamber leaks; if PP 0 ×t/t 0 =0, and Ck c ×C 0 =0, Then it is judged that the air chamber is not leaking.
以上实施例仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明保护范围之内。The above embodiments are only to illustrate the technical ideas of the present invention, and can not limit the protection scope of the present invention with this. All technical ideas proposed in accordance with the present invention, any changes made on the basis of technical solutions, all fall within the protection scope of the present invention. Inside.
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