CN105067851A - Signal generating device for power system energized test instrument calibration - Google Patents
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Abstract
本发明公开了一种用于电力系统带电测试仪器校验用的信号发生装置，包括信号发生器、参考信号功率放大器、测试信号功率放大器、选择开关、参考电压输出通道、参考电流输出通道、测试电流输出通道、参考电压采样反馈电路、参考电流采样反馈电路以及测试电流采样反馈电路。本发明的有益效果在于：本发明的信号发生装置能够模拟产生各类现场设备的电压、电流以及相位信号，有效地对容性设备进行相对介损测量，对金属氧化物避雷器进行阻性电流测量以及对变压器铁芯接地电流的测量，保证现场测试数据的可靠性。
The invention discloses a signal generating device used for calibration of a live test instrument in a power system, comprising a signal generator, a reference signal power amplifier, a test signal power amplifier, a selection switch, a reference voltage output channel, a reference current output channel, a test A current output channel, a reference voltage sampling feedback circuit, a reference current sampling feedback circuit and a test current sampling feedback circuit. The beneficial effects of the present invention are: the signal generating device of the present invention can simulate and generate voltage, current and phase signals of various field devices, effectively measure relative dielectric loss of capacitive devices, and measure resistive current of metal oxide arresters And the measurement of the ground current of the transformer iron core ensures the reliability of the field test data.
Description
技术领域technical field
本发明涉及信号发生器技术领域，尤其涉及一种用于电力系统带电测试仪器校验用的信号发生装置。The invention relates to the technical field of signal generators, in particular to a signal generating device used for checking live test instruments in electric power systems.
背景技术Background technique
为了保证电力系统的安全可靠地运行，电力系统中的各类高压电器设备都需要定期进行性能检测，传统的检测试验都是在停电下进行的，这样会对电网的供电带来损失，已不能满足广大电力用户的需求。因此，不停电试验的需求越来越迫切。近年来国内也逐渐开展了各类电器设备的不停电试验项目，其中容性设备的相对介损测量、金属氧化物避雷器的阻性电流测量、变压器铁芯接地电流的测量是其中开展较早的试验项目，各仪器生产厂家也推出了各自的产品，但目前产品性能指标参差不齐，相关试验的行业标准缺乏，因此如何对这类仪器进行有效的鉴定和检验，保证现场测试数据的可靠性，是目前迫切需要解决的问题。In order to ensure the safe and reliable operation of the power system, all kinds of high-voltage electrical equipment in the power system need regular performance testing. The traditional testing tests are all carried out under power outages, which will cause losses to the power supply of the power grid. To meet the needs of the majority of power users. Therefore, the demand for uninterrupted power test is more and more urgent. In recent years, non-stop test projects for various electrical equipment have been gradually carried out in China. Among them, the measurement of relative dielectric loss of capacitive equipment, the measurement of resistive current of metal oxide arresters, and the measurement of ground current of transformer core are the earliest ones. For test items, various instrument manufacturers have also launched their own products, but the current product performance indicators are uneven, and the industry standards for relevant tests are lacking. Therefore, how to effectively identify and inspect such instruments to ensure the reliability of on-site test data , is an urgent problem to be solved.
这几类带电测试仪器通常有两种校验模式：绝对法以及相对法，其中，绝对法是以现场母线上的电压互感器二次电压信号作为参考信号，测试设备的电流信号作为测试信号。相对法是以同一母线下的一台容性设备的电流信号作为参考信号，去测量另一台容性设备的电流信号。因此，对带电测试仪器进行校验用的模拟信号发生器也需要具备以上两种不同的校验模式。These types of live test instruments usually have two calibration modes: absolute method and relative method. Among them, the absolute method uses the secondary voltage signal of the voltage transformer on the field bus as the reference signal, and the current signal of the test equipment as the test signal. The relative method uses the current signal of a capacitive device under the same bus as a reference signal to measure the current signal of another capacitive device. Therefore, the analog signal generator used for calibrating live test instruments also needs to have the above two different calibrating modes.
为此，申请人经过有益的探索和研究，找到了解决上述问题的办法，下面将要介绍的技术方案便是在这种背景下产生的。For this reason, the applicant has found a solution to the above-mentioned problems through beneficial exploration and research, and the technical solutions to be introduced below are generated under this background.
发明内容Contents of the invention
本发明的目的在于：提供一种用于电力系统带电测试仪器校验用的信号发生装置。The object of the present invention is to provide a signal generating device used for calibration of live test equipment in electric power system.
本发明所解决的技术问题可以采用以下技术方案来实现：The technical problem solved by the present invention can adopt following technical scheme to realize:
一种用于电力系统带电测试仪器校验用的信号发生装置，包括A signal generating device used for calibration of live test instruments in power systems, comprising
一可产生参考信号和测试信号的信号发生器，所述信号发生器具有一参考信号发生输出端、一测试信号发生输出端以及一反馈信号输入端；A signal generator capable of generating reference signals and test signals, the signal generator has a reference signal generation output end, a test signal generation output end and a feedback signal input end;
一参考信号功率放大器，所述参考信号功率放大器具有一参考信号放大输入端和一参考信号放大输出端，所述参考信号功率放大器的参考信号放大输入端与所述信号发生器的参考信号发生输出端连接；A reference signal power amplifier, the reference signal power amplifier has a reference signal amplifying input end and a reference signal amplifying output end, the reference signal amplifying input end of the reference signal power amplifier and the reference signal generating output of the signal generator terminal connection;
一测试信号功率放大器，所述测试信号功率放大器具有一测试信号放大输入端和一测试信号放大输出端，所述测试信号功率放大器的测试信号放大输入端与所述信号发生器的测试信号发生输出端连接；A test signal power amplifier, the test signal power amplifier has a test signal amplification input end and a test signal amplification output end, the test signal amplification input end of the test signal power amplifier and the test signal generation output of the signal generator terminal connection;
一选择开关，所述选择开关具有一输入端和可切换的第一输出端和第二输出端，所述选择开关的输入端与所述参考信号功率放大器的参考信号放大输出端连接；A selection switch, the selection switch has an input terminal and a switchable first output terminal and a second output terminal, the input terminal of the selection switch is connected to the reference signal amplification output terminal of the reference signal power amplifier;
一参考电压输出通道，所述参考电压输出通道具有一电压输入端和一电压输出端，所述参考电压输出通道的电压输入端与所述选择开关的第一输出端连接；A reference voltage output channel, the reference voltage output channel has a voltage input terminal and a voltage output terminal, the voltage input terminal of the reference voltage output channel is connected to the first output terminal of the selection switch;
一参考电流输出通道，所述参考电流输出通道具有一电流输入端和一电流输出端，所述参考电流输出通道的电流输入端与所述选择开关的第二输出端连接；A reference current output channel, the reference current output channel has a current input end and a current output end, the current input end of the reference current output channel is connected to the second output end of the selection switch;
一测试电流输出通道，所述测试电流输出通道具有一电流输入端和一电流输出端，所述测试电流输出通道的电流输入端与所述测试信号功率放大器的测试信号放大输出端连接；A test current output channel, the test current output channel has a current input end and a current output end, the current input end of the test current output channel is connected to the test signal amplification output end of the test signal power amplifier;
一参考电压采样反馈电路，所述参考电压采样反馈电路具有一参考电压采集端、一参考电压输出端和一参考电压反馈端，所述参考电压采样反馈电路的参考电压采集端与所述参考电压输出通道的电压输出端连接，其参考电压输出端作为所述信号发生装置的参考电压输出端，其参考电压反馈端与所述信号发生器的反馈信号输入端连接；A reference voltage sampling feedback circuit, the reference voltage sampling feedback circuit has a reference voltage acquisition end, a reference voltage output end and a reference voltage feedback end, the reference voltage acquisition end of the reference voltage sampling feedback circuit is connected to the reference voltage The voltage output terminal of the output channel is connected, and its reference voltage output terminal is used as the reference voltage output terminal of the signal generating device, and its reference voltage feedback terminal is connected to the feedback signal input terminal of the signal generator;
一参考电流采样反馈电路，所述参考电流采样反馈电路具有一参考电流采集端、一参考电流输出端和一参考电流反馈端，所述参考电流采样反馈电路的参考电流采集端与所述参考电流输出通道的电流输出端连接，其参考电流输出端作为所述信号发生装置的参考电流输出端，其参考电流反馈端与所述信号发生器的反馈信号输入端连接；以及A reference current sampling feedback circuit, the reference current sampling feedback circuit has a reference current acquisition end, a reference current output end and a reference current feedback end, the reference current acquisition end of the reference current sampling feedback circuit is connected to the reference current The current output terminal of the output channel is connected, its reference current output terminal is used as the reference current output terminal of the signal generating device, and its reference current feedback terminal is connected to the feedback signal input terminal of the signal generator; and
一测试电流采样反馈电路，所述测试电流反馈电路具有一测试电流采集端、一测试电流输出端和一测试电流反馈端，所述测试电流采样反馈电路的测试电流采集端与所述测试电流输出通道的电流输出端连接，其测试电流输出端作为所述信号发生装置的测试电流输出端，其测试电流反馈端与所述信号发生器的反馈信号输入端连接。A test current sampling feedback circuit, the test current feedback circuit has a test current acquisition end, a test current output end and a test current feedback end, the test current acquisition end of the test current sampling feedback circuit is connected to the test current output The current output terminal of the channel is connected, the test current output terminal is used as the test current output terminal of the signal generating device, and the test current feedback terminal is connected to the feedback signal input terminal of the signal generator.
在本发明的一个优选实施例中，所述信号发生器包括：In a preferred embodiment of the present invention, the signal generator includes:
一用于负责接收外接串口的设置参数并根据所述设备参数合成参考信号和测试信号的第一单片机，所述第一单片机具有第一、第二、第三信号输出端；A first single-chip microcomputer responsible for receiving setting parameters of an external serial port and synthesizing a reference signal and a test signal according to the device parameters, the first single-chip microcomputer has first, second, and third signal output terminals;
一第二单片机，所述第二单片机具有第一、第二信号输入端和第一、第二信号输出端，所述第二单片机的第一信号输入端与所述第一单片机的第一信号输出端；A second single-chip microcomputer, the second single-chip microcomputer has first and second signal input terminals and first and second signal output terminals, the first signal input terminal of the second single-chip microcomputer is connected with the first signal of the first single-chip microcomputer output terminal;
一倍频器，所述倍频器具有第一、第二调频输入端和调频输出端，所述倍频器的第一、第二调频输入端分别与第一单片机的第二信号输出端和第二单片机的第一信号输出端连接，所述倍频器的调频输出端与第二单片机的第二信号输入端连接；A frequency multiplier, the frequency multiplier has first and second frequency modulation input terminals and frequency modulation output terminals, the first and second frequency modulation input terminals of the frequency multiplier are respectively connected to the second signal output terminal and the second signal output terminal of the first single-chip microcomputer The first signal output end of the second single-chip microcomputer is connected, and the frequency modulation output end of the frequency multiplier is connected with the second signal input end of the second single-chip microcomputer;
第一数模转换器，所述第一数模转换器具有信号转换输入端和第一、第二信号转换输出端，所述第一数模转换器的信号转换输入端与第二单片机的第二信号输出端连接；The first digital-to-analog converter, the first digital-to-analog converter has a signal conversion input terminal and first and second signal conversion output terminals, the signal conversion input terminal of the first digital-to-analog converter is connected to the second single-chip microcomputer Two signal output terminals are connected;
第一、第二乘法器，所述第一、第二乘法器分别具有第一、第二调幅输入端和调幅输出端，所述第一、第二乘法器的第一调幅输入端分别与第一数模转换器的第一、第二信号转换输出端连接，所述第一、第二乘法器的调幅输出端分别作为所述信号发生器的参考信号发生输出端和测试信号发生输出端；First and second multipliers, the first and second multipliers have first and second AM input terminals and AM output terminals respectively, the first AM input terminals of the first and second multipliers are connected to the first AM input terminals respectively The first and second signal conversion output ends of a digital-to-analog converter are connected, and the amplitude modulation output ends of the first and second multipliers are respectively used as the reference signal generation output end and the test signal generation output end of the signal generator;
第二数模转换器，所述第二数模转换器具有信号转换输入端和信号转换输出端，所述第二数模转换器的信号转换输入端与第一单片机的第三信号输出端连接；The second digital-to-analog converter, the second digital-to-analog converter has a signal conversion input terminal and a signal conversion output terminal, and the signal conversion input terminal of the second digital-to-analog converter is connected to the third signal output terminal of the first single-chip microcomputer ;
一运算放大器，所述运算放大器具有第一、第二运算输入端和第一、第二运算输出端，所述运算放大器的第一运算输入端与第二数模转换器的信号转换输出端连接，所述运算放大器的第一、第二运算输出端与第一、第二乘法器的第二调幅输入端连接；以及An operational amplifier, the operational amplifier has first and second operational input terminals and first and second operational output terminals, the first operational input terminal of the operational amplifier is connected to the signal conversion output terminal of the second digital-to-analog converter , the first and second operational output terminals of the operational amplifier are connected to the second amplitude modulation input terminals of the first and second multipliers; and
一反馈电路，所述反馈电路具有一反馈信号输入端和一反馈信号输出端，所述反馈电路的反馈信号输入端作为所述信号发生器的反馈信号输入端，所述反馈信号输出端与所述运算放大器的第二运算输入端连接。A feedback circuit, the feedback circuit has a feedback signal input terminal and a feedback signal output terminal, the feedback signal input terminal of the feedback circuit is used as the feedback signal input terminal of the signal generator, and the feedback signal output terminal is connected to the feedback signal output terminal The second operational input terminal of the operational amplifier is connected.
由于采用了如上的技术方案，本发明的有益效果在于：本发明的信号发生装置能够模拟产生各类现场设备的电压、电流以及相位信号，有效地对容性设备进行相对介损测量，对金属氧化物避雷器进行阻性电流测量以及对变压器铁芯接地电流的测量，保证现场测试数据的可靠性。Due to the adoption of the above technical solution, the beneficial effect of the present invention is that the signal generating device of the present invention can simulate and generate voltage, current and phase signals of various field devices, effectively measure the relative dielectric loss of capacitive devices, and Oxide arresters are used to measure resistive current and ground current of transformer iron core to ensure the reliability of on-site test data.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1是本发明的流程框图。Fig. 1 is a flowchart of the present invention.
图2是本发明的信号发生器的结构示意图。Fig. 2 is a schematic structural diagram of the signal generator of the present invention.
具体实施方式Detailed ways
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体图示，进一步阐述本发明。In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
参见图1，图中给出的是一种用于电力系统带电测试仪器校验用的信号发生装置，包括信号发生器100、参考信号功率放大器200、测试信号功率放大器300、选择开关400、参考电压输出通道510、参考电流输出通道520、测试电流输出通道530、参考电压采样反馈电路610、参考电流采样反馈电路620以及测试电流采样反馈电路630。Referring to Fig. 1, what is shown in the figure is a kind of signal generating device used for the verification of live test equipment in power system, including signal generator 100, reference signal power amplifier 200, test signal power amplifier 300, selection switch 400, reference The voltage output channel 510 , the reference current output channel 520 , the test current output channel 530 , the reference voltage sampling feedback circuit 610 , the reference current sampling feedback circuit 620 and the test current sampling feedback circuit 630 .
信号发生器100可产生参考信号和测试信号，参见图2，信号发生器100包括第一、第二单片机110a、110b、倍频器120、第一、第二数模转换器130a、130b、第一、第二乘法器140a、140b、运算放大器150以及反馈电路160。The signal generator 100 can generate reference signals and test signals. Referring to FIG. 1. The second multipliers 140 a , 140 b , the operational amplifier 150 and the feedback circuit 160 .
第一单片机110a具有第一、第二、第三信号输出端111a、112a以及113a。第二单片机110b具有第一、第二信号输入端111b、112b和第一、第二信号输出端113b、114b。第二单片机110b的第一信号输入端111a与第一单片机110a的第一信号输出端111a。The first single-chip microcomputer 110a has first, second and third signal output terminals 111a, 112a and 113a. The second single-chip microcomputer 110b has first and second signal input terminals 111b and 112b and first and second signal output terminals 113b and 114b. The first signal input end 111a of the second single-chip microcomputer 110b is connected with the first signal output end 111a of the first single-chip microcomputer 110a.
倍频器120具有第一、第二调频输入端121、122和调频输出端123，倍频器120的第一、第二调频输入端121、122分别与第一单片机110a的第二信号输出端112a和第二单片机110b的第一信号输出端111b连接，倍频器120的调频输出端123与第二单片机110b的第二信号输入端112b连接。The frequency multiplier 120 has first and second frequency modulation input terminals 121, 122 and frequency modulation output terminals 123, and the first and second frequency modulation input terminals 121 and 122 of the frequency multiplier 120 are connected to the second signal output terminal of the first single-chip microcomputer 110a respectively. 112a is connected to the first signal output terminal 111b of the second single-chip microcomputer 110b, and the frequency modulation output terminal 123 of the frequency multiplier 120 is connected to the second signal input terminal 112b of the second single-chip microcomputer 110b.
第一数模转换器130a具有信号转换输入端131a和第一、第二信号转换输出端132a、133a，第一数模转换器130a的信号转换输入端131a与第二单片机110b的第二信号输出端114b连接。The first digital-to-analog converter 130a has a signal conversion input terminal 131a and first and second signal conversion output terminals 132a, 133a. Terminal 114b is connected.
第一、第二乘法器140a、140b分别具有第一、第二调幅输入端141a、142a、141b、142b和调幅输出端143a、143b，第一、第二乘法器140a、140b的第一调幅输入端141a、141b分别与第一数模转换器130a的第一、第二信号转换输出端132a、133a连接，第一、第二乘法器140a、140b的调幅输出端143a、143b分别作为信号发生器100的参考信号发生输出端101和测试信号发生输出端102。The first and second multipliers 140a and 140b respectively have first and second amplitude modulation input terminals 141a, 142a, 141b and 142b and amplitude modulation output terminals 143a and 143b. Terminals 141a, 141b are respectively connected with the first and second signal conversion output terminals 132a and 133a of the first digital-to-analog converter 130a, and the amplitude modulation output terminals 143a and 143b of the first and second multipliers 140a and 140b are respectively used as signal generators The reference signal generation output terminal 101 of 100 and the test signal generation output terminal 102 .
第二数模转换器130b具有信号转换输入端131b和信号转换输出端132b，第二数模转换器130b的信号转换输入端131b与第一单片机110a的第三信号输出端113a连接。The second digital-to-analog converter 130b has a signal conversion input terminal 131b and a signal conversion output terminal 132b, and the signal conversion input terminal 131b of the second digital-to-analog converter 130b is connected to the third signal output terminal 113a of the first single-chip microcomputer 110a.
运算放大器150具有第一、第二运算输入端151、152和第一、第二运算输出端153、154，运算放大器150的第一运算输入端151与第二数模转换器130b的信号转换输出端132b连接，运算放大器150的第一、第二运算输出端153、154与第一、第二乘法器140a、140b的第二调幅输入端142a、142b连接。The operational amplifier 150 has first and second operational input terminals 151, 152 and first and second operational output terminals 153 and 154, the first operational input terminal 151 of the operational amplifier 150 and the signal conversion output of the second digital to analog converter 130b The first and second operational output terminals 153 and 154 of the operational amplifier 150 are connected to the second amplitude modulation input terminals 142a and 142b of the first and second multipliers 140a and 140b.
反馈电路160具有一反馈信号输入端161和一反馈信号输出端162，反馈电路160的反馈信号输入端161作为信号发生器100的反馈信号输入端103，反馈电路160的反馈信号输出端162与运算放大器150的第二运算输入端152连接。Feedback circuit 160 has a feedback signal input end 161 and a feedback signal output end 162, the feedback signal input end 161 of feedback circuit 160 is used as the feedback signal input end 103 of signal generator 100, the feedback signal output end 162 of feedback circuit 160 and operation A second operational input 152 of the amplifier 150 is connected.
第一单片机110a用于负责接收外接串口的设置参数，并且根据该设备参数合成参考信号和测试信号，该参考信号和测试信号为波形数据(含有基波及各次谐波)，每个周期等分为1000个数据，然后将参考信号和测试信号的波形数据发送至第二单片机110b，第二单片机110b将参考信号和测试信号更具设定的时间同步输出到第一数模转换器130a中，那么第一数模转换器130a输出两路合成的模拟信号，一路作为参考信号，另一路作为测试信号。The first single-chip microcomputer 110a is used to be responsible for receiving the setting parameters of the external serial port, and synthesize a reference signal and a test signal according to the device parameters. The reference signal and the test signal are waveform data (containing fundamental waves and harmonics), and each cycle is divided For 1000 data, then the waveform data of the reference signal and the test signal are sent to the second single-chip microcomputer 110b, and the second single-chip microcomputer 110b outputs the reference signal and the test signal more synchronously to the first digital-to-analog converter 130a, Then the first digital-to-analog converter 130a outputs two synthesized analog signals, one as a reference signal and the other as a test signal.
采用第一、第二乘法器140a、140b作为调幅器，用于调节第二数模转换器130b的输出电压，这样就可以调节输出信号的幅度大小。The first and second multipliers 140a and 140b are used as amplitude modulators for adjusting the output voltage of the second digital-to-analog converter 130b, so that the amplitude of the output signal can be adjusted.
利用第二单片机110b的定时器产生一个标准的50Hz的基准信号，输入到倍频器120，倍频器120的倍频系数由第一单片机110a的分频器来设定。通过设定不同分频系数，使得倍频器120输出不同的扫频信号，第二单片机110b根据这个扫频信号逐个将波形数据输出至第一数模转换器130a，这样就可以达到信号频率调节的功能。The timer of the second single-chip microcomputer 110b is used to generate a standard 50Hz reference signal, which is input to the frequency multiplier 120, and the frequency multiplication coefficient of the frequency multiplier 120 is set by the frequency divider of the first single-chip microcomputer 110a. By setting different frequency division coefficients, the frequency multiplier 120 outputs different frequency sweep signals, and the second single-chip microcomputer 110b outputs the waveform data to the first digital-to-analog converter 130a one by one according to the frequency sweep signals, so that signal frequency adjustment can be achieved function.
信号发生器100最终输出的参考信号及测试信号通过电压电流采样，输入到反馈电路160，采用运算放大器150将反馈信号与第二数模转换器130b输出的调幅基准信号进行误差比较，并将运算放大器150的输出信号接到第一、第二乘法器140a、140b的调幅输入，这样就形成了输出与基准信号的闭环，保证输出信号的幅值保持恒定。The reference signal and test signal finally output by the signal generator 100 are sampled by voltage and current, and then input to the feedback circuit 160. The operational amplifier 150 is used to compare the feedback signal with the amplitude modulation reference signal output by the second digital-to-analog converter 130b for error comparison, and calculate The output signal of the amplifier 150 is connected to the amplitude modulation input of the first and second multipliers 140a, 140b, thus forming a closed loop between the output and the reference signal to ensure that the amplitude of the output signal remains constant.
参考信号功率放大器200具有一参考信号放大输入端210和一参考信号放大输出端220，参考信号功率放大器200的参考信号放大输入端210与信号发生器100的参考信号发生输出端101连接。因为信号发生器100输出的参考信号的输出能够推动标准表的负载，所以需要将参考信号进行功率放大，参考信号功率放大器200的最大输出电流可达10A，参考信号功率放大器200可以驱动后级的电压、电流输出变压器。The reference signal power amplifier 200 has a reference signal amplifying input end 210 and a reference signal amplifying output end 220 , the reference signal amplifying input end 210 of the reference signal power amplifier 200 is connected to the reference signal generating output end 101 of the signal generator 100 . Because the output of the reference signal output by the signal generator 100 can push the load of the standard meter, it is necessary to amplify the power of the reference signal. The maximum output current of the reference signal power amplifier 200 can reach 10A, and the reference signal power amplifier 200 can drive the power of the subsequent stage. Voltage and current output transformers.
测试信号功率放大器300具有一测试信号放大输入端310和一测试信号放大输出端320，测试信号功率放大器300的测试信号放大输入端310与信号发生器100的测试信号发生输出端102连接。因为信号发生器100输出的测试信号的输出能够推动标准表和测试表的负载，所以需要将测试信号进行功率放大，测试信号功率放大器300的最大输出电流可达10A，测试信号功率放大器300可以驱动后级的电压、电流输出变压器。The test signal power amplifier 300 has a test signal amplifying input end 310 and a test signal amplifying output end 320 , the test signal amplifying input end 310 of the test signal power amplifier 300 is connected to the test signal generating output end 102 of the signal generator 100 . Because the output of the test signal output by the signal generator 100 can push the load of the standard meter and the test meter, it is necessary to amplify the power of the test signal. The maximum output current of the test signal power amplifier 300 can reach 10A, and the test signal power amplifier 300 can drive The voltage and current output transformer of the latter stage.
选择开关400具有一输入端410和可相互切换的第一输出端420和第二输出端430，选择开关400的输入端410与参考信号功率放大器200的参考信号放大输出端220连接。可以通过选择开关400选择不同的校验模式。The selection switch 400 has an input terminal 410 and mutually switchable first output terminal 420 and second output terminal 430 , the input terminal 410 of the selection switch 400 is connected to the reference signal amplification output terminal 220 of the reference signal power amplifier 200 . Different verification modes can be selected through the selection switch 400 .
参考电压输出通道510具有一电压输入端511和一电压输出端512，参考电压输出通道510的电压输入端511与选择开关400的第一输出端420连接。参考电压输出通道510主要由一个电压输出变压器及一组档位切换继电器组成，根据输出电压大小不同，切换不同的输出档位。The reference voltage output channel 510 has a voltage input terminal 511 and a voltage output terminal 512 , the voltage input terminal 511 of the reference voltage output channel 510 is connected to the first output terminal 420 of the selection switch 400 . The reference voltage output channel 510 is mainly composed of a voltage output transformer and a set of gear switching relays, which switch between different output gears according to different output voltages.
参考电流输出通道520具有一电流输入端521和一电流输出端522，参考电流输出通道520的电流输入端521与选择开关400的第二输出端430连接。参考电流输出通道520主要由一个电流输出变压器及一组档位切换继电器组成，根据输出电流大小不同，切换不同的输出档位。The reference current output channel 520 has a current input terminal 521 and a current output terminal 522 , and the current input terminal 521 of the reference current output channel 520 is connected to the second output terminal 430 of the selection switch 400 . The reference current output channel 520 is mainly composed of a current output transformer and a set of gear switching relays, which switch between different output gears according to the magnitude of the output current.
测试电流输出通道530具有一电流输入端531和一电流输出端532，测试电流输出通道530的电流输入端531与测试信号功率放大器300的测试信号放大输出端320连接。测试电流输出通道530主要由一个电流输出变压器及一组档位切换继电器组成，根据输出电流大小不同，切换不同的输出档位。The test current output channel 530 has a current input terminal 531 and a current output terminal 532 , and the current input terminal 531 of the test current output channel 530 is connected to the test signal amplification output terminal 320 of the test signal power amplifier 300 . The test current output channel 530 is mainly composed of a current output transformer and a set of gear switching relays, which switch between different output gears according to the magnitude of the output current.
参考电压采样反馈电路610具有一参考电压采集端611、一参考电压输出端612和一参考电压反馈端613，参考电压采样反馈电路610的参考电压采集端611与参考电压输出通道510的电压输出端512连接，其参考电压输出端612作为本发明的信号发生装置的参考电压输出端，其参考电压反馈端613与信号发生器100的反馈信号输入端103连接。参考电压采样反馈电路610采样的是电阻分压网络及运算放大器实现，根据不同的档位用不同的分压比得到归一的反馈电压。The reference voltage sampling feedback circuit 610 has a reference voltage acquisition end 611, a reference voltage output end 612 and a reference voltage feedback end 613, the reference voltage acquisition end 611 of the reference voltage sampling feedback circuit 610 and the voltage output end of the reference voltage output channel 510 512 connection, its reference voltage output terminal 612 is used as the reference voltage output terminal of the signal generating device of the present invention, and its reference voltage feedback terminal 613 is connected to the feedback signal input terminal 103 of the signal generator 100 . The sampling of the reference voltage sampling feedback circuit 610 is realized by a resistor voltage divider network and an operational amplifier, and a normalized feedback voltage is obtained by using different voltage divider ratios according to different gear positions.
参考电流采样反馈电路620具有一参考电流采集端621、一参考电流输出端622和一参考电流反馈端623，参考电流采样反馈电路620的参考电流采集端621与参考电流输出通道520的电流输出端522连接，其参考电流输出端622作为本发明的信号发生装置的参考电流输出端，其参考电流反馈端623与信号发生器100的反馈信号输入端103连接。参考电流采样反馈电路620采样的是电流互感器及运算放大器实现，根据不同的档位用不同的电流比得到归一的反馈电压。The reference current sampling feedback circuit 620 has a reference current acquisition end 621, a reference current output end 622 and a reference current feedback end 623, the reference current acquisition end 621 of the reference current sampling feedback circuit 620 and the current output end of the reference current output channel 520 522 connection, its reference current output terminal 622 is used as the reference current output terminal of the signal generating device of the present invention, and its reference current feedback terminal 623 is connected to the feedback signal input terminal 103 of the signal generator 100 . The sampling of the reference current sampling feedback circuit 620 is realized by a current transformer and an operational amplifier, and a normalized feedback voltage is obtained by using different current ratios according to different gear positions.
测试电流采样反馈电路630具有一测试电流采集端631、一测试电流输出端632和一测试电流反馈端633，测试电流采样反馈电路630的测试电流采集端631与测试电流输出通道530的电流输出端532连接，其测试电流输出端作为本发明的信号发生装置的测试电流输出端，其测试电流反馈端633与信号发生器100的反馈信号输入端103连接。测试电流采样反馈电路630采样的是电流互感器及运算放大器实现，根据不同的档位用不同的电流比得到归一的反馈电压。The test current sampling feedback circuit 630 has a test current acquisition end 631, a test current output end 632 and a test current feedback end 633, the test current acquisition end 631 of the test current sampling feedback circuit 630 and the current output end of the test current output channel 530 532, the test current output terminal is used as the test current output terminal of the signal generating device of the present invention, and the test current feedback terminal 633 is connected to the feedback signal input terminal 103 of the signal generator 100. The test current sampling feedback circuit 630 samples current transformers and operational amplifiers, and uses different current ratios to obtain normalized feedback voltages according to different gear positions.
本发明的信号发生装置能够模拟产生各类现场设备的电压、电流以及相位信号，有效地对容性设备进行相对介损测量，对金属氧化物避雷器进行阻性电流测量以及对变压器铁芯接地电流的测量，保证现场测试数据的可靠性。The signal generating device of the present invention can simulate and generate voltage, current and phase signals of various field devices, effectively measure the relative dielectric loss of capacitive devices, measure the resistive current of metal oxide arresters and measure the grounding current of transformer cores. The measurement ensures the reliability of field test data.
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.
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