CN203133266U - Digital testing and evaluation platform used for optical-fiber-type current transformer - Google Patents

Abstract

The invention discloses a digital test and evaluation platform for fiber optic current transformers, which belongs to the test field. The digital test and evaluation platform includes a standard current transformer, a fiber optic current transformer to be tested, a power supply component, a data reading component and a digital current transformer accuracy calibrator; the primary current output terminal of the power supply component and the The standard current transformer and the primary current input terminal of the fiber optic current transformer to be tested are connected correspondingly; the signal output terminal of the fiber optic current transformer to be tested is connected to the signal input terminal of the data reading component; the signal output terminal of the data reading component is connected to the digital current transformer The data signal input end of the transformer accuracy calibrator is connected; the clock signal output end of the digital current transformer accuracy calibrator is connected with the clock signal input end of the data reading component. It solves the problem of the accuracy test of the all-fiber current transformer, and provides a method for the test work of similar equipment in the future. It can be widely used in the testing field of all fiber optic current transformers.

Description

Digital test and evaluation platform for fiber optic current transformer

technical field

The utility model belongs to the testing field, in particular to a testing device for an optical fiber current transformer.

Background technique

Traditional CTs (current transformers) are widely used, while all-fiber current transformers are used for the first time in the 220 kV power grid in the city where the applicant is located.

All-fiber current transformers are used for the first time in 220 kV XX smart substation. In the 220 kV outlet bin, the neutral point of the main transformer high and medium voltage side, the high voltage side gap, the main transformer 110 kV bin, the 110 kV feeder bin, the 110 kV subsection, the main transformer 35 kV bin, the grounding transformer high/ All fiber optic current transformers are used on the low voltage side.

How to ensure the accuracy of current sampling, build a test platform different from the traditional CT accuracy test, and ensure that the tested all-fiber current transformer meets the requirements in terms of stability and accuracy is a very urgent task.

Utility model content

The technical problem to be solved by the utility model is to provide a digital test and evaluation platform for fiber optic current transformers, which solves the problem of accuracy testing of all fiber optic current transformers, and provides a method for testing similar equipment in the future .

The technical scheme of the utility model is to provide a digital test and evaluation platform for fiber optic current transformers, which is characterized by:

The digital test evaluation platform includes a standard current transformer, a fiber-optic current transformer to be tested, a power supply component, a data reading component and a digital current transformer accuracy calibrator; wherein,

The primary current output terminal of the power supply component is connected to the primary current input terminal of the standard current transformer and the optical fiber current transformer to be tested respectively;

The signal output end of the optical fiber current transformer to be tested is correspondingly connected with the signal input end of the data reading component;

The signal output end of the data reading component is correspondingly connected to the data signal input end of the digital current transformer accuracy calibrator;

The clock signal output end of the digital current transformer accuracy calibrator is correspondingly connected to the clock signal input end of the data reading component.

Specifically, the power supply assembly is composed of a voltage regulator, a power supply control box and a step-up transformer connected in sequence, and the primary current output terminal of the step-up transformer is connected to the standard current transformer and the fiber-optic current transformer to be tested. The primary current input terminals are respectively connected correspondingly.

The data reading component is composed of a first electrical unit, a second electrical unit and a merging unit, and the output signals of the optical fiber current transformer to be tested pass through the first electrical unit in the optical fiber current transformer to be tested. 1. The second sensitive ring is correspondingly connected with the signal input ends of the first and second electric units in turn, and the signal output ends of the first and second electric units are sequentially connected with the first and second signal input ends of the merging unit corresponding connection.

The data signal input/output ports between the optical fiber current transformer to be tested, the data reading component and the digital current transformer accuracy calibrator are respectively connected via optical fibers.

The analog output port of the standard current transformer is correspondingly connected with the analog input port of the digital current transformer accuracy calibrator.

The standard current transformer, the optical fiber current transformer to be tested, the power supply component, the data reading component and the grounding end of the digital current transformer accuracy calibrator are connected to the common ground.

Compared with the prior art, the utility model has the advantages of:

1. It uses the existing conventional test units and instruments to build a digital test and evaluation platform for all-fiber current transformers for the first time, providing a method for future testing of similar equipment;

2. The platform adopts a unified clock synchronization signal, which is convenient for unified test base point and timing control;

3. The data transmission of the test platform is based on the digital communication mode, with high precision and uniform signal format, which is convenient for information exchange with other digital systems.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

In Fig. 1, the digital test and evaluation platform for fiber optic current transformer described in the utility model is composed of at least a standard current transformer, a fiber optic current transformer to be tested, a power supply component, a data reading component and a digital Current transformer accuracy calibrator constitutes.

Wherein: the primary current output terminal of the power supply component is connected to the primary current input terminal of the standard current transformer and the optical fiber current transformer to be tested respectively, and the signal output terminal of the optical fiber current transformer to be tested is connected to the data The signal input end of the reading component is connected correspondingly, the signal output end of the data reading component is connected correspondingly with the data signal input end of the digital current transformer accuracy calibrator, and the digital current transformer accuracy calibrator The clock signal output end of the tester is correspondingly connected with the clock signal input end of the data reading component.

Specifically, the power supply assembly is composed of a voltage regulator, a power supply control box and a step-up transformer connected in sequence, and the primary current output terminal of the step-up transformer is connected to the standard current transformer and the fiber-optic current transformer to be tested. The primary current input terminals are respectively connected correspondingly.

The data reading component is composed of a first electrical unit, a second electrical unit and a merging unit, and the output signals of the optical fiber current transformer to be tested pass through the first electrical unit in the optical fiber current transformer to be tested. 1. The second sensitive ring is correspondingly connected with the signal input ends of the first and second electric units in turn, and the signal output ends of the first and second electric units are sequentially connected with the first and second signal input ends of the merging unit corresponding connection.

Further, the data signal input/output ports between the optical fiber current transformer to be tested, the data reading component and the digital current transformer accuracy calibrator are respectively connected via optical fibers.

The analog output port of the standard current transformer is correspondingly connected with the analog input port of the digital current transformer accuracy calibrator.

The standard current transformer, the optical fiber current transformer to be tested, the power supply component, the data reading component and the grounding end of the digital current transformer accuracy calibrator are connected to the common ground.

In the figure, in order to show the difference, the connections of conventional copper wires are represented by thin solid lines, the connections of optical fibers are represented by dotted lines, the connections of primary circuits are represented by thick solid lines, and the clock synchronization signals are represented by thin dotted lines.

It can be seen from the figure that the output optical signal of the fiber-optic current transformer to be tested is output through the first and second sensitive rings (represented by sensitive ring 1 and sensitive ring 2 in the figure), and is transmitted to the first and second electrical signals through optical fibers. The unit (represented by electrical unit 1 and electrical unit 2 in the figure, which is actually an optical signal switch), is transmitted from the first and second electrical units to the first and second optical signal acquisition inputs of the merging unit (model NS3261) via optical fiber. Ports (R1, T1 and R2, T2), and then transmitted to the second parameter extraction port of the digital current transformer accuracy calibrator through optical fiber; the clock synchronization port of the merging unit and the digital current transformer accuracy calibrator The clock signal synchronization port of the standard current transformer is connected correspondingly; the analog output signal of the standard current transformer is transmitted to the first parameter extraction port of the digital current transformer accuracy calibrator through the standard resistance and the A/D converter; the first, the second The data from the two-parameter extraction port is sent to the calculation module (actually the main CPU for calculation) for corresponding comparison, calculation and recording, display and graphic output.

Since the voltage regulator, the power control box and the step-up transformer are all prior art, the specific controllable method of their wiring is no longer described here.

Since this drawing adopts the standard icon and marking method in the industry, those skilled in the art should be able to fully understand its meaning and the connection relationship between various modules and components, and fully understand the problem-solving ideas of this technical solution and technical ideas.

In the actual test, the specific test steps are as follows:

(1) Test the forward swing method to ensure that the all-fiber-optic current transformer under test forms a path;

(2) Build a standard current transformer test platform;

(3) Build a digital test and evaluation platform, in which the measured current value needs to be collected from the merging unit or the SV optical switch through the optical fiber;

(4) Boost the flow and start the test.

In the actual test process, through the test, it can be found that when the primary equipment passes 20% or 100% of the rated current, the output signal waveform of the all-fiber current transformer is relatively flat without glitches. At the same time, the reverse polarity of the sensitive ring can also be checked through testing, which can also be reflected in the graph.

Since the utility model adopts a fully digital test platform structure, a digital test and evaluation platform of an all-fiber-optic current transformer is constructed, which provides a method for testing similar equipment in the future; the platform adopts a unified clock synchronization signal, which is convenient for unified testing Base point and timing control; the data transmission of the entire test platform is based on digital communication mode, with high precision and uniform signal format, which is convenient for information exchange with other digital systems.

The utility model can be widely used in the testing field of all optical fiber current transformers.

Claims (6)

1. A digital test and evaluation platform for fiber optic current transformers, characterized in that: The digital test evaluation platform includes a standard current transformer, a fiber-optic current transformer to be tested, a power supply component, a data reading component and a digital current transformer accuracy calibrator; wherein, The primary current output terminal of the power supply component is connected to the primary current input terminal of the standard current transformer and the optical fiber current transformer to be tested respectively; The signal output end of the optical fiber current transformer to be tested is correspondingly connected with the signal input end of the data reading component; The signal output end of the data reading component is correspondingly connected to the data signal input end of the digital current transformer accuracy calibrator; The clock signal output end of the digital current transformer accuracy calibrator is correspondingly connected to the clock signal input end of the data reading component. 2. According to the digital test evaluation platform for fiber optic current transformer according to claim 1, it is characterized in that the described power supply assembly is composed of a voltage regulator, a power control box and a step-up transformer connected in sequence, and its step-up The primary current output terminal of the voltage transformer is correspondingly connected with the primary current input terminals of the standard current transformer and the optical fiber current transformer to be tested. 3. according to claim 1, is used for the digitization test evaluation platform of fiber-optic current transformer, it is characterized in that described data reading assembly is made of first electrical unit, second electrical unit and merging unit, and its The output signal of the fiber optic current transformer to be tested passes through the first and second sensitive rings in the fiber optic current transformer to be tested, and is sequentially connected to the signal input terminals of the first and second electrical units. 1. The signal output end of the second electrical unit is connected to the first and second signal input ends of the merging unit in sequence. 4. according to claim 1 or 3 described digital test and evaluation platforms for optical fiber current transformers, it is characterized in that said optical fiber current transformers to be tested, data reading components and digital current transformer accuracy calibration The data signal input/output ports between test instruments are respectively connected through optical fibers. 5. according to claim 1, is used for the digitized test evaluation platform of fiber-optic current transformer, it is characterized in that the analog quantity output port of described standard current transformer, and the precision calibrator of digital current transformer Corresponding connection of the analog input port. 6. The digital test and evaluation platform for fiber optic current transformers according to claim 1, characterized in that said standard current transformers, fiber optic current transformers to be tested, power supply components, data reading components and digital The ground terminal of the type current transformer accuracy calibrator is connected to the common ground.

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