CN106680753A - DC current transformer accuracy level test method, system and apparatus - Google Patents

Abstract

The embodiment of the present application discloses a DC current transformer accuracy level testing method, system and device. The satellite positioning information is obtained by controlling the host computer, and the satellite positioning information is processed to obtain a synchronous pulse signal; according to the synchronous pulse signal, the standard DC current transformer is collected. The standard current signal or standard voltage signal output by the current transformer, obtain the actual current signal or actual voltage signal output by the measured DC current transformer collected by the wireless terminal, and calculate the error between the standard current signal and the actual current signal, or the standard The error between the voltage signal and the actual voltage signal, according to the error, the accuracy level of the measured DC current transformer is obtained; this application is based on wireless communication technology, and the actual current signal or actual voltage signal output by the measured DC current transformer is passed through The wireless transmission method is sent to the control host, and is suitable for testing the accuracy level of the DC current transformer in the DC converter station.

Description

Method, system and device for testing accuracy level of DC current transformer

technical field

The present application relates to the technical field of accuracy testing of DC current transformers, in particular to a method, system and device for testing accuracy levels of DC current transformers.

Background technique

In order to control and protect the DC transmission system and ensure the safe and stable operation of the DC transmission system, it is necessary to measure some quantities including the DC current. At present, the current of the DC transmission system is usually measured by the DC current transformer in the DC transmission system. In order to ensure the accuracy of the measurement results of the DC current transformer, it is particularly important to test the accuracy of the DC current transformer.

In the existing DC current transformer accuracy level test method, a standard DC current transformer is usually provided, and a calibrator is connected to the secondary side of the measured DC current transformer and the standard DC current transformer, and the DC current source is The primary side of the tested DC current transformer and standard DC current transformer supplies current, and the actual current signal of the secondary side of the tested DC current transformer and the standard current signal of the secondary side of the standard DC current transformer are input into the calibrator , the error between the standard current signal and the actual current signal is measured by the calibrator, and the accuracy level of the measured DC current transformer is analyzed according to the error.

In a DC converter station, the DC current transformer to be tested is set in the DC field and is usually transmitted to the protection control room through optical fiber or a secondary circuit. In the field test, the standard DC current transformer is usually set in the DC field and is close to the primary side of the tested DC current transformer. However, since the secondary side of the tested DC current transformer is in the protection control room, the distance The DC field is far away. If the secondary side of the measured DC current transformer and the secondary side of the standard DC current transformer are connected to the calibrator together, a long optical fiber needs to be used, and the wiring is cumbersome, which is not easy in the field test. Therefore, the existing test method for the accuracy level of the DC current transformer is not suitable for testing the accuracy level of the DC current transformer in the DC converter station.

Contents of the invention

This application provides a DC current transformer accuracy level test method, system and device to solve the problem that the existing DC current transformer accuracy level test method is not suitable for the accuracy of the DC current transformer in the DC converter station. Questions for degree level testing.

In the first aspect, the present application provides a method for testing the accuracy level of a DC current transformer. The method includes: controlling the host computer to obtain satellite positioning information, processing the satellite positioning information, and obtaining a synchronous pulse signal;

The control host collects the standard current signal or the standard voltage signal output by the standard DC current transformer according to the synchronous pulse signal, and obtains the actual current signal or the actual voltage signal output by the measured DC current transformer, wherein the actual current signal or The actual voltage signal is collected by the wireless terminal and sent to the control host through wireless transmission, and the acquisition process of the wireless terminal and the control host is synchronized;

The control host calculates the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal, and obtains the measured DC current transformer according to the error level of accuracy.

In combination with the first aspect, in the first possible implementation of the first aspect, the control host collects the standard voltage signal output by the standard DC current transformer according to the synchronous pulse signal, including:

Under the trigger of the synchronous pulse signal, the control host collects the standard analog current signal or the standard analog voltage signal output by the standard DC current transformer;

The control host decomposes the standard analog current signal or the standard analog voltage signal by wavelet transform to obtain the standard analog voltage signal in the lowest frequency band;

The control host converts the standard analog voltage signal in the lowest frequency band into a standard digital voltage signal;

The control host performs finite-length unit impulse response band-pass filtering on the standard digital voltage signal to obtain the standard voltage signal.

In a second aspect, the present application provides another method for testing the accuracy level of a DC current transformer, which includes:

The wireless terminal acquires satellite positioning information, processes the satellite positioning information, and obtains a synchronous pulse signal;

According to the synchronous pulse signal, the wireless terminal collects the actual current signal or the actual voltage signal output by the measured DC current transformer, and sends the actual current signal or the actual voltage signal to the control host through wireless transmission, so that the control host Calculate the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal, and obtain the accuracy level of the measured DC current transformer according to the error, wherein , the standard current signal or standard voltage signal is collected by a control host, and the control host is synchronized with the collection process of the wireless terminal.

In combination with the second aspect, in the first possible implementation of the second aspect, the wireless terminal collects the actual voltage signal output by the measured DC current transformer according to the synchronization pulse signal, including:

Under the trigger of the synchronization pulse signal, the wireless terminal collects the actual analog current signal or the actual analog voltage signal output by the measured DC current transformer;

The wireless terminal decomposes the actual analog current signal or the actual analog voltage signal by wavelet transform to obtain the actual analog voltage signal in the lowest frequency band;

The wireless terminal converts the actual analog voltage signal in the lowest frequency band into an actual digital voltage signal;

The wireless terminal performs finite-length unit impulse response band-pass filtering on the actual digital voltage signal to obtain the actual voltage signal.

In combination with the second aspect, in a second possible implementation of the second aspect, the wireless terminal collects the actual current signal output by the measured DC current transformer according to the synchronous pulse signal, including:

Under the trigger of the synchronization pulse signal, the wireless terminal collects the actual digital current signal output by the measured DC current transformer;

The wireless terminal performs finite-length unit impulse response band-pass filtering on the actual digital current signal to obtain the actual current signal.

In a third aspect, the present application provides a DC current transformer accuracy level test system, the system includes: a DC current source, a standard DC current transformer, a control host and a wireless terminal, and the DC current source is connected to the A standard DC current transformer is connected to the primary side of the tested DC current transformer, the control host is connected to the secondary side of the standard DC current transformer, and the wireless terminal is connected to the tested DC current transformer. Secondary side connection;

The DC current source is used to provide primary current for the standard DC current transformer and the tested DC current transformer;

The standard DC current transformer is used to output a standard current signal or a standard voltage signal;

The control host is used to obtain satellite positioning information, and process the satellite positioning information to obtain a synchronous pulse signal; collect a standard current signal or a standard voltage signal output by a standard DC current transformer according to the synchronous pulse signal, and obtain An actual current signal or an actual voltage signal output by the measured DC current transformer; calculating an error between the standard current signal and the actual current signal, or an error between the standard voltage signal and the actual voltage signal; According to the error, the accuracy level of the measured DC current transformer is obtained;

The wireless terminal is used to obtain satellite positioning information, and process the satellite positioning information to obtain a synchronous pulse signal; according to the synchronous pulse signal, collect an actual current signal or an actual voltage signal output by the measured DC current transformer; The actual current signal or the actual voltage signal is sent to a control host through wireless transmission, wherein the control host is synchronized with the collection process of the wireless terminal.

In the fourth aspect, the present application provides a DC current transformer accuracy level testing device, which is used to implement the DC current transformer accuracy level testing method provided in the first aspect, and the device includes:

The satellite synchronization unit of the control host is used to obtain satellite positioning information, process the satellite positioning information, and obtain a synchronous pulse signal;

A standard quantity acquisition unit, configured to acquire a standard current signal or a standard voltage signal output by a standard DC current transformer according to the synchronous pulse signal;

The wireless data receiving unit is used to obtain the actual current signal or the actual voltage signal output by the DC current transformer under test;

a test analysis unit, configured to calculate the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal, and obtain the measured Accuracy class of DC current transformers.

In the fifth aspect, the present application provides another DC current transformer accuracy level testing device, which is used to implement the DC current transformer accuracy level testing method provided in the second aspect, and the device includes:

The wireless terminal satellite synchronization unit is used to obtain satellite positioning information, process the satellite positioning information, and obtain a synchronization pulse signal;

An actual quantity acquisition unit, configured to acquire an actual current signal or an actual voltage signal output by the measured DC current transformer according to the synchronous pulse signal;

The wireless data sending unit is used to send the actual current signal or the actual voltage signal to the control host, so that the control host can calculate the error between the standard current signal and the actual current signal, or the standard voltage signal and the actual voltage The error between the signals, according to the error, the accuracy level of the tested DC current transformer is obtained.

It can be seen from the above technical solutions that the embodiments of the present invention provide a DC current transformer accuracy level testing method, system and device. In the method, the control host acquires satellite positioning information, processes the satellite positioning information, and obtains a synchronous pulse signal; According to the synchronous pulse signal, the control host collects the standard current signal or standard voltage signal output by the standard DC current transformer, and obtains the actual current signal or actual voltage signal output by the measured DC current transformer, wherein the actual current signal or actual voltage signal is determined by The wireless terminal is collected and sent to the control host through wireless transmission. The acquisition process of the wireless terminal and the control host is synchronized; the control host calculates the error between the standard current signal and the actual current signal, or the difference between the standard voltage signal and the actual voltage signal. According to the error, the accuracy level of the measured DC current transformer is obtained; this application is based on wireless communication technology, and the actual current signal or actual voltage signal output by the measured DC current transformer is sent to the control host through wireless transmission. , to effectively solve the problem that in the DC converter station, since the secondary side of the measured DC current transformer is in the protection control room and far away from the DC field, if the secondary side of the measured DC current transformer is connected to the standard DC current transformer The secondary side of the secondary side is connected to the calibrator together, which needs to use a long optical fiber, the wiring is more cumbersome, and it is not easy to operate in the field test. It is suitable for the accuracy level of the DC current transformer in the DC converter station. test.

Description of drawings

In order to illustrate the technical solution of the present application more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, on the premise of not paying creative labor, Additional drawings can also be derived from these drawings.

FIG. 1 is a schematic diagram of a DC current transformer accuracy level test system provided by an embodiment of the present application;

Fig. 2 is a flow chart of a method for testing the accuracy level of a DC current transformer provided in the embodiment of the present application;

Fig. 3 is the flow chart of the method for controlling the host computer to collect the standard current signal or the standard voltage signal output by the standard DC current transformer provided by the embodiment of the present application;

FIG. 4 is a flow chart of another DC current transformer accuracy level testing method provided in the embodiment of the present application;

5 is a flow chart of a method for a wireless terminal to collect an actual current signal or an actual voltage signal output by a measured DC current transformer provided in an embodiment of the present application;

6 is a flow chart of another method for collecting the actual current signal output by the measured DC current transformer by the wireless terminal provided by the embodiment of the present application;

FIG. 7 is a block diagram of the control host of the DC current transformer accuracy level test system provided by the embodiment of the present application;

FIG. 8 is a structural block diagram of a wireless terminal of the DC current transformer accuracy level testing system provided by the embodiment of the present application.

Illustration: 1-DC current source; 2-standard DC current transformer; 3-control host; 4-wireless terminal; 5-tested DC current transformer; 31-standard quantity acquisition unit; 32-control host satellite synchronization unit; 33-wireless data receiving unit; 34-test analysis unit; 41-actual quantity acquisition unit; 42-wireless terminal satellite synchronization unit; 43-wireless data sending unit.

detailed description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

At present, in the DC converter station, since the standard DC current transformer is set in the DC field and is close to the primary side of the tested DC current transformer, the secondary side of the tested DC current transformer is in the protection control room. The DC field is far away. If the secondary side of the measured DC current transformer and the secondary side of the standard DC current transformer are connected to the calibrator together, a long optical fiber needs to be used, and the wiring is cumbersome, which is not easy in the field test. In this regard, embodiments of the present invention provide a method, system and device for testing accuracy levels of DC current transformers, which are suitable for testing the accuracy levels of DC current transformers in DC converter stations.

Please refer to Figure 1, which is a schematic structural diagram of a DC current transformer accuracy level test system shown in an embodiment of the present invention. Using the DC current transformer accuracy level test system, the DC current transformer under test can be tested. The accuracy class of the current transformer is tested.

The DC current transformer accuracy level test system includes: DC current source 1, standard DC current transformer 2, control host 3 and wireless terminal 4, DC current source 1 and standard DC current transformer 2, and the measured DC current The primary side of the transformer 5 is connected, the control host 3 is connected to the secondary side of the standard DC current transformer 2 , and the wireless terminal 4 is connected to the secondary side of the measured DC current transformer 5 .

The standard DC current transformer can be an analog output type transformer, and the measured DC current transformer can be an analog output type transformer or a digital output type transformer.

The wireless terminal 4 is provided with an analog quantity interface and a digital quantity interface, which can meet the test of current transformers of different output types.

Both the control host 3 and the wireless terminal 4 are powered by a 220V AC power supply.

When the system is working, the DC current source 1 provides primary current to the standard DC current transformer 2 and the measured DC current transformer 5 . The standard DC current transformer 2 outputs a standard current signal or a standard voltage signal, so as to compare the standard current signal with the actual current signal output by the measured DC current transformer 5, or compare the standard voltage signal with the output of the measured DC current transformer 5 The actual voltage signal is compared; the control host 3 obtains satellite positioning information, processes the satellite positioning information, and obtains a synchronous pulse signal; according to the synchronous pulse signal, collects the standard current signal or standard voltage signal output by the standard DC current transformer 2, and obtains The actual current signal or actual voltage signal output by the measured DC current transformer 5; calculate the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal; according to the error, test the measured DC Accuracy class of current transformer 5. The wireless terminal 4 is used to obtain satellite positioning information, process the satellite positioning information, and obtain a synchronous pulse signal; collect the actual current signal or actual voltage signal output by the measured DC current transformer 5 according to the synchronous pulse signal; through wireless transmission, The actual current signal or the actual voltage signal is sent to the control host 3, wherein the control host 3 and the wireless terminal 4 are synchronized in the acquisition process.

The DC current transformer accuracy level test system provided in this embodiment, based on wireless communication technology, sends the actual current signal or actual voltage signal output by the measured DC current transformer to the control host through wireless transmission, effectively solving the problem of the DC current transformer. In the converter station, since the secondary side of the measured DC current transformer is in the protection control room and far away from the DC field, if the secondary side of the measured DC current transformer and the secondary side of the standard DC current transformer are Connecting to the calibrator requires the use of long optical fibers, cumbersome wiring, and difficult operation in field tests. It is suitable for testing the accuracy level of DC current transformers in DC converter stations.

Please refer to FIG. 2 , which is a flow chart of a method for testing the accuracy level of a DC current transformer provided by an embodiment of the present invention. The method includes:

Step S11, the control host acquires satellite positioning information, processes the satellite positioning information, and obtains a synchronous pulse signal. The control host can receive Beidou satellite positioning information through the Beidou satellite antenna, and process it through the high-precision Beidou satellite timing board inside the control host to obtain synchronous pulse signals, and can also obtain synchronous pulse signals through GPS satellites.

Step S12, the control host collects the standard current signal or the standard voltage signal output by the standard DC current transformer according to the synchronous pulse signal, and obtains the actual current signal or the actual voltage signal output by the measured DC current transformer, wherein the actual current signal or the actual The voltage signal is collected by the wireless terminal and sent to the control host through wireless transmission, and the acquisition process of the wireless terminal and the control host is synchronized.

Please refer to Figure 3. According to the synchronous pulse signal, the control host collects the standard voltage signal output by the standard DC current transformer, which may include:

Step S121 , the control host, under the trigger of the synchronous pulse signal, collects the standard analog current signal or the standard analog voltage signal output by the standard DC current transformer.

Step S122, the control host decomposes the standard analog current signal or the standard analog voltage signal by wavelet transform to obtain the standard analog voltage signal in the lowest frequency band. In this step, the standard analog current signal or the standard analog voltage signal is converted into a standard analog voltage signal in the lowest frequency band through a high-precision resistor.

Step S123, the control host converts the standard analog voltage signal in the lowest frequency band into a standard digital voltage signal. This step is realized by an analog-to-digital converter.

Step S124, the control host performs finite-length unit impulse response band-pass filtering on the standard digital voltage signal to obtain a standard voltage signal.

Among them, the control host decomposes the standard analog current signal or the standard analog voltage signal by wavelet transform to obtain the standard analog voltage signal in the lowest frequency band, so that the standard analog voltage signal can be converted into a high-precision standard digital voltage signal. The analog-to-digital converter can be composed of several converters with different sampling frequencies, which are consistent with the sampling rate of the measured DC current transformer, and can realize acquisition at multiple sampling frequencies.

For example, the sampling frequency of the digital quantity of the DC current transformer under test is 10kHz, and the DC quantity is obtained by using the wavelet coefficient with the frequency band of the DC component. Carry out 9-level wavelet decomposition, select the frequency band where the DC component is located, and obtain the DC component from the a0 wavelet coefficients with a frequency range of 0 to 20 Hz. Specifically, after summing all discrete signals and then performing an average, it can be calculated. Calibrate the DC component A1 of the transformer; since the sampling frequency of the digital quantity of the measured DC current transformer is 10kHz, the A/D acquisition and conversion frequency of the analog quantity of the standard DC current transformer is 10kHz, and the filtering process is performed using db4 The wavelet decomposes the secondary discrete signal of the standard DC current transformer into a 9-layer wavelet, selects the frequency band where the DC component is located, and obtains the DC component from the a0 wavelet coefficient with a frequency range of 0-20Hz. Specifically, after summing all the discrete signals, Carry out the average value, thus the DC component A2 of the DC current transformer under test can be calculated, and finally the ratio error of the DC current transformer under test can be calculated.

Step S13, the control host calculates the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal, and obtains the accuracy level of the measured DC current transformer according to the error.

Among them, set the rated primary current of the DC current transformer under test as In, and test the DC current transformer under test at any point within the range of (0.1In-1.2In), or test these test points: 0.1In, 0.2In In, 0.5In, 0.8In, 1.0In, 1.2In are tested, if the measured error meets the requirements, the tested DC current transformer has passed the test. When testing the rise and fall variation of the tested DC current transformer, the primary current of the tested DC current transformer rises to 1.2In, and then drops to any test point within the measurement range, the value between the rising value and the falling value The error variation should not be greater than 1/3 of the error limit corresponding to its accuracy level. When testing the short-term stability of the DC current transformer under test, the error change of the DC current transformer under test should not exceed 1/3 of the error limit corresponding to its accuracy level under the rated current. For example, in the field test of a 0.2-level DC current transformer, the fluctuation variation and short-term stability should not be greater than 1/3 of 0.2.

The DC current transformer accuracy level test method provided in this embodiment uses the control host to obtain satellite positioning information, processes the satellite positioning information, and obtains a synchronous pulse signal; the control host collects the output of the standard DC current transformer according to the synchronous pulse signal Standard current signal or standard voltage signal to obtain the actual current signal or actual voltage signal output by the tested DC current transformer, wherein the actual current signal or actual voltage signal is collected by the test slave wireless terminal and sent to The control host, the test slave wireless terminal and the acquisition process of the control host are synchronized; the control host calculates the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal, and according to the error, the measured The accuracy level of the DC current transformer, this method is based on wireless communication technology, the actual current signal or the actual voltage signal output by the measured DC current transformer is sent to the control host through wireless transmission, effectively solving the problem in the DC converter station. , since the secondary side of the tested DC current transformer is in the protection control room and far away from the DC field, if the secondary side of the tested DC current transformer and the secondary side of the standard DC current transformer are connected together for calibration The instrument needs to use a long optical fiber, the wiring is cumbersome, and it is not easy to operate in the field test. It is suitable for testing the accuracy level of the DC current transformer in the DC converter station.

Please refer to Fig. 4, which is a flow chart of another DC current transformer accuracy level testing method provided by an embodiment of the present invention, the method includes:

Step S21, the wireless terminal acquires satellite positioning information, processes the satellite positioning information, and obtains a synchronous pulse signal.

Step S22, the wireless terminal collects the actual current signal or the actual voltage signal output by the measured DC current transformer according to the synchronous pulse signal, and sends the actual current signal or the actual voltage signal to the control host through wireless transmission, so that the control host calculates The error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal, according to the error, the accuracy level of the measured DC current transformer is obtained, where the standard current signal is collected by the control host , the control host and the acquisition process of the wireless terminal are synchronized.

The wireless terminal can make full use of the characteristics of strong real-time performance and rich I/O port configuration of field programmable gate array (English: Field-Programmable GateArray, abbreviation: FPGA), and complete the process by controlling the physical layer (English: PhysicalLaye, abbreviation: PHY) chip. Receive the sampling value data of the tested DC current transformer IEC61850-9 protocol (English: Sample Value, abbreviation: SV), and adaptively receive the sampling value data conforming to the standard FT3 of IEC60044-8 or FT3 conforming to the national grid standard. For digital source signals, according to the synchronization pulse from the satellite synchronization unit of the wireless terminal, the arrival time of the packet header is accurately recorded, and the PowerPC obtains the data received by the FPGA through the dual-port RAM technology, and through the Ethernet physical interface, with the help of TCP/ IP protocol, which submits sampled messages with precise time stamps to the test and analysis unit of the control host.

Please refer to Figure 5. If the DC current transformer under test is an analog output transformer, the wireless terminal collects the actual current signal or actual voltage signal output by the DC current transformer under test according to the synchronous pulse signal, including:

S221. The wireless terminal collects an actual analog current signal or an actual analog voltage signal output by the measured DC current transformer under the trigger of the synchronous pulse signal.

S222. The wireless terminal decomposes the actual analog current signal or the actual analog voltage signal by wavelet transform to obtain the actual analog voltage signal in the lowest frequency band.

S223. The wireless terminal converts the actual analog voltage signal in the lowest frequency band into an actual digital voltage signal. This step is realized by an analog-to-digital converter.

S224. The wireless terminal performs finite-length unit impulse response bandpass filtering on the actual digital voltage signal to obtain the actual voltage signal.

Please refer to Figure 6. If the DC current transformer under test is a digital output transformer, the wireless terminal collects the actual current signal output by the DC current transformer under test according to the synchronization signal, including:

S225. The wireless terminal collects an actual digital current signal output by the measured DC current transformer under the trigger of the synchronization signal.

S226. The wireless terminal performs finite-length unit impulse response bandpass filtering on the actual digital current signal to obtain the actual current signal.

In the method for testing the accuracy level of a DC current transformer provided in this embodiment, the wireless terminal obtains satellite positioning information, processes the satellite positioning information, and obtains a synchronous pulse signal; the wireless terminal collects the output data of the measured DC current transformer according to the synchronous pulse signal The actual current signal or actual voltage signal, through wireless transmission, sends the actual current signal or actual voltage signal to the control host, so that the control host can calculate the error between the standard current signal and the actual current signal, or the standard voltage signal and the actual voltage The error between the signals, according to the error, the accuracy level of the measured DC current transformer is obtained. Among them, the standard current signal is collected by the control host, and the acquisition process of the control host and the wireless terminal is synchronized. This method is based on wireless communication technology. The actual current signal or actual voltage signal output by the measured DC current transformer is sent to the control host through wireless transmission, which effectively solves the problem that in the DC converter station, since the secondary side of the measured DC current transformer is in the protection control room, It is far away from the DC field. If the secondary side of the measured DC current transformer and the secondary side of the standard DC current transformer are connected to the calibrator together, a long optical fiber needs to be used, and the wiring is cumbersome. In the field test The problem of difficult operation is suitable for testing the accuracy level of DC current transformers in DC converter stations.

Please refer to Fig. 7, a DC current transformer accuracy level test device provided by an embodiment of the present invention is used to implement the above DC current transformer accuracy level test method, the device includes:

The control host satellite synchronization unit 31 is used to obtain satellite positioning information, process the satellite positioning information, and obtain a synchronous pulse signal;

The standard quantity acquisition unit 32 is used to collect the standard current signal or the standard voltage signal output by the standard DC current transformer according to the synchronous pulse signal;

A wireless data receiving unit 33, configured to obtain an actual current signal or an actual voltage signal output by the measured DC current transformer;

The test analysis unit 34 is used to calculate the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal, and obtain the accuracy level of the tested DC current transformer according to the error.

Please refer to Fig. 8, another DC current transformer accuracy level test device provided in the embodiment of the present invention is used to implement the above-mentioned another DC current transformer accuracy level test method, the device includes:

The wireless terminal satellite synchronization unit 41 is used to obtain satellite positioning information, process the satellite positioning information, and obtain a synchronous pulse signal;

The actual quantity acquisition unit 42 is used to acquire the actual current signal or the actual voltage signal output by the measured DC current transformer according to the synchronous pulse signal;

The wireless data sending unit 43 is used to send the actual current signal or the actual voltage signal to the control host, so that the control host can calculate the error between the standard current signal and the actual current signal, or the error between the standard voltage signal and the actual voltage signal , according to the error, the accuracy level of the measured DC current transformer is obtained.

In specific implementation, the present invention also provides a computer storage medium, wherein the computer storage medium can store a program, and when the program is executed, it can include the parts in each embodiment of the DC current transformer accuracy level test method provided by the present invention or all steps. The storage medium can be a magnetic disk, an optical disk, a read-only memory (English: read-only memory, abbreviated: ROM), or a random access memory (English: random access memory, abbreviated: RAM).

Those skilled in the art can clearly understand that the technologies in the embodiments of the present invention can be implemented by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the essence of the technical solutions in the embodiments of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM , magnetic disk, optical disk, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods of various embodiments or some parts of the embodiments of the present invention.

For the same and similar parts among the various embodiments in this specification, refer to each other. In particular, for the embodiment of the DC current transformer accuracy level testing device provided by the present invention, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant details, please refer to the description in the method embodiment.

The above embodiments of the present invention are not intended to limit the protection scope of the present invention.

Claims (8)

1. a kind of DC current transformer class of accuracy method of testing, it is characterised in that methods described includes：

Control main frame obtains satellite positioning information, and the satellite positioning information is processed, and obtains synchronization pulse；

Control main frame gathers the standard current signal or mark of the output of standard DC current transformer according to the synchronization pulse Quasi- voltage signal, obtains the actual current signal or actual voltage signal of the output of measured DC transformer, wherein, the reality Border current signal or actual voltage signal are collected by wireless terminal, and are sent to the control master by wireless transmission method Machine, the wireless terminal is synchronous with the gatherer process of the control main frame；

Control main frame calculates the error between the standard current signal and the actual current signal, or normal voltage letter Number with the error between the actual voltage signal, according to the error, obtain the accurate of the measured DC transformer Degree grade.

2. the method for claim 1, it is characterised in that control main frame gathers standard according to the synchronization pulse The standard voltage signal of DC current transformer output, including：

Control main frame gathers the master die analog quantity of standard DC current transformer output under the triggering of the synchronization pulse Current signal or master die analog quantity voltage signal；

The master die analog quantity current signal or master die analog quantity voltage signal are carried out wavelet transformation decomposition by control main frame, are obtained The master die analog quantity voltage signal of peak low band；

The master die analog quantity voltage signal of the peak low band is converted to standard digital amount voltage signal by control main frame；

Control main frame has carried out limit for length's unit impulse response bandpass filtering treatment to the standard digital amount voltage signal, obtains institute State standard voltage signal.

3. a kind of DC current transformer class of accuracy method of testing, it is characterised in that methods described includes：

Wireless terminal obtains satellite positioning information, and the satellite positioning information is processed, and obtains synchronization pulse；

Wireless terminal gathers the actual current signal or reality of the output of measured DC transformer according to the synchronization pulse Border voltage signal, by wireless transmission method, the actual current signal or actual voltage signal is sent to control main frame, with Control main frame is set to calculate the error between standard current signal and the actual current signal, or standard voltage signal and the reality Error between the voltage signal of border, according to the error, obtains the class of accuracy of the measured DC transformer, its In, the standard current signal or standard voltage signal are collected by control main frame, the control main frame and the wireless end The gatherer process synchronization at end.

4. method as claimed in claim 3, it is characterised in that wireless terminal is gathered tested according to the synchronization pulse The actual voltage signal of DC current transformer output, including：

Wireless terminal gathers the realistic simulation amount of measured DC transformer output under the triggering of the synchronization pulse Current signal or realistic simulation amount voltage signal；

The realistic simulation amount current signal or realistic simulation amount voltage signal are carried out wavelet transformation decomposition by wireless terminal, are obtained The realistic simulation amount voltage signal of peak low band；

The realistic simulation amount voltage signal of the peak low band is converted into real figure amount voltage signal by wireless terminal；

Wireless terminal has carried out limit for length's unit impulse response bandpass filtering treatment to the real figure amount voltage signal, obtains institute State actual voltage signal.

5. method as claimed in claim 3, it is characterised in that wireless terminal is gathered tested according to the synchronization pulse The actual current signal of DC current transformer output, including：

Wireless terminal gathers the real figure amount of measured DC transformer output under the triggering of the synchronization pulse Current signal；

Wireless terminal has carried out limit for length's unit impulse response bandpass filtering treatment to the real figure amount current signal, obtains institute State actual current signal.

6. a kind of DC current transformer class of accuracy test system, it is characterised in that include：DC current source, standard straight Stream current transformer, control main frame and wireless terminal, the DC current source respectively with the standard DC current transformer, with And the primary side connection of measured DC transformer, the secondary side of the control main frame and the standard DC current transformer Connection, the wireless terminal is connected with the secondary side of the measured DC transformer；

The DC current source, for being that the standard DC current transformer and the measured DC transformer provide one Primary current；

The standard DC current transformer, for outputting standard current signal or standard voltage signal；

The control main frame, for obtaining satellite positioning information, is processed the satellite positioning information, obtains lock-out pulse Signal；According to the synchronization pulse, the standard current signal or normal voltage of the output of standard DC current transformer are gathered Signal, obtains the actual current signal or actual voltage signal of the output of measured DC transformer；Calculate the normalized current Mistake between error between signal and the actual current signal, or the standard voltage signal and the actual voltage signal Difference；According to the error, the class of accuracy of the measured DC transformer is obtained；

The wireless terminal, for obtaining satellite positioning information, is processed the satellite positioning information, obtains lock-out pulse Signal；According to the synchronization pulse, the actual current signal or virtual voltage of the output of measured DC transformer are gathered Signal；By wireless transmission method, the actual current signal or actual voltage signal are sent to control main frame, wherein, institute State control main frame synchronous with the gatherer process of the wireless terminal.

7. a kind of DC current transformer class of accuracy test device, it is characterised in that include：

Control main frame satellite synchronization unit, for obtaining satellite positioning information, is processed the satellite positioning information, is obtained Synchronization pulse；

Standard volume collecting unit, for according to the synchronization pulse, gathering the standard of standard DC current transformer output Current signal or standard voltage signal；

Wireless data receiving unit, for obtaining the actual current signal or virtual voltage letter of the output of measured DC transformer Number；

Test analysis unit is for calculating the error between the standard current signal and the actual current signal or described Error between standard voltage signal and the actual voltage signal, according to the error, obtains the measured DC mutual The class of accuracy of sensor.

8. a kind of DC current transformer class of accuracy test device, it is characterised in that include：

Wireless terminal satellite synchronization unit, for obtaining satellite positioning information, is processed the satellite positioning information, is obtained Synchronization pulse；

Actual amount collecting unit, for according to the synchronization pulse, gathering the reality of measured DC transformer output Current signal or actual voltage signal；

Wireless data transmission unit, for the actual current signal or actual voltage signal to be sent to control main frame, so that Control main frame calculates the error between standard current signal and the actual current signal, or standard voltage signal and the reality Error between voltage signal, according to the error, obtains the class of accuracy of the measured DC transformer.