CN111999569A - A current transformer transformation ratio detection device and detection method thereof - Google Patents

Abstract

The invention discloses a current transformer transformation ratio detection device and a detection method thereof, which belong to the technical field of electric power systems. The current transformer transformation ratio detection device comprises a host, a slave and a terminal; the host is used for receiving the current transformer sent by the terminal. Change ratio detection request, collect the current on the primary side of the current transformer, and collect the current on the secondary side of the current transformer at the same time through the slave machine, and calculate the current transformer transformation ratio according to the current on the primary side and the secondary side of the current transformer; It is used to collect the current of the secondary side of the current transformer according to the instructions issued by the host and report it to the host; the terminal is used to receive the primary current of the current transformer, the current of the secondary side and the transformation ratio of the current transformer reported by the host and output and display it. The invention can obtain and display the transformation ratio of the current transformer quickly, reliably and in real time, and the device is convenient to carry, flexible and simple to operate.

Description

A current transformer transformation ratio detection device and detection method thereof

technical field

The invention relates to a current transformer transformation ratio detection device and a detection method thereof, belonging to the technical field of electric power systems.

Background technique

With the rapid development of power technology, it is very necessary to be able to detect accurate and reliable current transformer transformation ratios in real time; in the prior art, the detection device is mainly measured manually, and the current clamp is used to measure the current. The current value on both sides of the transformer is calculated, and the actual transformation ratio value of the current transformer is obtained. In the actual detection process, the current flowing through the current transformer is changing in real time. The current value on both sides of the current transformer is manually read, and the measured current value has a delay, that is, the current at the same time cannot be read. The current value on both sides of the transformer is not read at the same time, resulting in misjudgment and inaccuracy of the transformation ratio of the current transformer, additional calculations are required, and the transformation ratio of the current transformer cannot be expressed intuitively; The position of the traditional detection device is fixed when used, and the detection personnel are often faced with different working environments, and it is inconvenient to operate when reading and acquiring data.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a current transformer transformation ratio detection device and a detection method thereof, which can obtain and display the current transformer transformation ratio quickly, reliably and in real time.

To achieve the above object, the present invention adopts the following technical solutions to realize:

In a first aspect, the present invention provides a current transformer transformation ratio detection device, including a host, a slave and a terminal;

The host is used to receive the current transformer transformation ratio detection request issued by the terminal, collect the current of the primary side of the current transformer, and collect the current of the secondary side of the current transformer at the same time through the slave, and according to the current of the primary side of the current transformer, The secondary side current calculates the transformation ratio of the current transformer;

The slave is used to collect the secondary side current of the current transformer according to the instruction issued by the host and report it to the host;

The terminal is used for receiving the primary side current, secondary side current and current transformer transformation ratio of the current transformer reported by the host and outputting and displaying.

Further, the terminal includes a terminal CPU and a data bus interface, a Bluetooth communication unit and an LCD display unit connected with the terminal CPU, and the terminal CPU communicates with the host through a data bus interface, and the data bus interface includes An image electronic LCD interface adapted to the LCD display unit and a Bluetooth interface adapted to the Bluetooth communication unit.

Further, the terminal, the host and the slave are respectively configured with their own JTAG interfaces, and the host is respectively connected to the terminal and the slave through the JTAG interface for communication and connection for performing internal communication tests.

Further, the terminal, the host, and the slave are respectively equipped with their own power supply units, and the power supply units include a battery, a battery capacity detection unit for detecting remaining power, and a battery conversion unit for battery and external power conversion.

Further, the master and the slave are respectively equipped with their own signal acquisition units, and the signal acquisition unit includes a signal collector, an open-loop coil and a signal acquisition and processing chip; the signal collector can collect current mutual inductance through the open-loop coil. The primary side/secondary side current of the device is collected, and the collected current signal is transmitted to the signal acquisition and processing chip for signal processing.

In a second aspect, the present invention provides a method for detecting the transformation ratio of a current transformer, the method comprising the following steps:

The terminal establishes a communication link with the host;

The terminal sends a current transformer ratio detection request to the host, collects the primary current of the current transformer through the host, and obtains the secondary current of the current transformer at the same time from the slave through the host;

The terminal receives the primary side current, secondary side current and current transformer transformation ratio of the current transformer reported by the host and outputs and displays, and the current transformer transformation ratio is the host according to the current transformer primary side current and the current transformer The transformation ratio of the current transformer obtained by the secondary side current calculation.

Further, the method for establishing a communication link between the terminal and the host includes the following steps:

Perform Bluetooth pairing between the terminal and the host according to the preset Bluetooth matching information: If the pairing is unsuccessful, the current Bluetooth matching information will be erased, and the Bluetooth pairing will be performed again according to the following steps:

(a) Reconfigure the Bluetooth matching information of the terminal;

(b) The terminal sends a test command to the host, so that the host automatically sends the test command to the slave after receiving the test command;

(c) The terminal receives the Bluetooth matching status of the master and the slave returned by the master. If the matching is passed, it indicates that the communication link has been established; otherwise, it returns to step (a).

Further, the method also includes:

According to the received current transformer transformation ratio, the abnormal transformation ratio of the current transformer is judged, and the change of the transformation ratio in the abnormal state of the current transformer is obtained.

In a third aspect, the present invention provides a terminal, including a processor and a storage medium;

the storage medium is used for storing instructions;

The processor is adapted to operate in accordance with the instructions to perform the steps of the method of any one of the second aspects.

In a fourth aspect, the present invention provides a computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the steps of any one of the methods in the second aspect are implemented.

Compared with the prior art, the beneficial effects achieved by the present invention:

The current transformer transformation ratio detection device and its detection method provided by the present invention receive the primary side current, secondary side current and current transformer transformation ratio of the current transformer reported by the host through the terminal and output and display it, which can be fast, reliable and real-time. Obtain and display the current transformer transformation ratio at the same time;

The terminal, the host and the slave of the detection device are easy to carry, flexible and simple to operate, reliable and safe; wherein, the terminal realizes the movable remote control, the adaptability of the working environment is stronger, and the operation is more convenient.

Description of drawings

1 is a system block diagram of a current transformer transformation ratio detection device provided in Embodiment 1 of the present invention;

Fig. 2 is the structural block diagram of the terminal in Fig. 1;

Fig. 3 is the structural block diagram of the host computer and the slave machine in Fig. 1;

4 is a flowchart of a current mutual inductance transformation ratio detection method provided in Embodiment 2 of the present invention;

Fig. 5 is the working flow chart of the terminal in Fig. 4;

Fig. 6 is the working flow chart of the host computer in Fig. 4;

FIG. 7 is a working flow chart of the slave in FIG. 4 .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

Example 1:

FIG. 1 is a system block diagram of a current transformer (CT) transformation ratio detection device provided by an embodiment of the present invention. It can be known that the current transformer transformation ratio detection device includes a terminal, a host, and a slave; wherein, the host and the slave are connected through Bluetooth V4 .0 transmission protocol is used to transmit data and instructions, and data and instructions are transmitted between the terminal and the host through the Bluetooth V4.0 transmission protocol.

When in use, the acquisition lines of the master and the slave respectively clamp the primary side coil and the secondary side coil of the current transformer to obtain the corresponding primary side current and secondary side current data of the current transformer. The host of the current transformer transformation ratio detection device is used to receive the current transformer transformation ratio detection request issued by the terminal, collect the current data of the primary side of the current transformer, and collect the current data of the secondary side of the current transformer at the same time through the slave machine. And calculate the transformation ratio of the current transformer according to the current data of the primary side and the current data of the secondary side of the current transformer; the slave is used to collect the current data of the secondary side of the current transformer according to the instructions issued by the host and report it to the host; the terminal is used to receive the host. The reported current data of the primary side of the current transformer, the current data of the secondary side and the transformation ratio of the current transformer are output and displayed.

As shown in FIG. 2 , the terminal of the current transformer ratio detection device provided by the present invention includes a terminal CPU, a data bus interface, a Bluetooth communication unit, a power supply unit, a real-time clock unit, a key processing unit, an LCD display unit and a JTAG. The power supply unit of the terminal includes a battery, a battery capacity detection unit for detecting remaining power, and a battery conversion unit for battery and external power conversion; specifically, the battery of the terminal is connected to the terminal CPU through the battery capacity detection unit, and the power The conversion unit is connected with the terminal CPU and provides two options of power supply and battery supply. The data bus interface, the bluetooth communication unit, the real-time clock unit and the key processing unit of the above-mentioned terminal are respectively connected with the terminal CPU; The terminal CPU communicates with the host through the data bus interface to realize communication data interaction; it also communicates with the host through the JTAG interface, which can be used for communication testing between the terminal and the host.

As shown in FIG. 3 , the host and the slave of the current transformer ratio detection device provided by the present invention include the same structure and hardware, and specifically include a host/slave CPU, a power supply unit, a data bus interface, a signal acquisition unit, and a real-time clock. unit, key processing unit, LED display unit and JTAG. Wherein, the power supply unit of the master/slave includes a battery, a battery capacity detection unit for detecting the remaining power, and a battery conversion unit for converting the battery and the external power source.

The battery of the host/slave is connected with the host/slave CPU through the battery capacity detection unit, and the power conversion unit is connected with the host/slave CPU and provides two options of power supply and battery power. The data bus interface, bluetooth communication unit, real-time clock unit, key processing unit, and LED display unit of the above-mentioned host/slave are respectively connected with the host/slave CPU, wherein the data bus interface of the host/slave includes a FLASH interface, and The Bluetooth interface adapted to the Bluetooth communication unit; the CPU of the host computer communicates with the Bluetooth interface adapted to the Bluetooth communication unit of the terminal and the slave respectively through the Bluetooth interface adapted to the Bluetooth communication unit to realize mutual communication and data exchange.

The master and the slave are respectively equipped with their own signal acquisition units. The signal acquisition unit includes a signal collector, an open-loop coil and a signal acquisition and processing chip; wherein, the signal collector can collect the primary side/secondary side of the current transformer through the open-loop coil. The collected current signal is transmitted to the signal acquisition and processing chip for signal processing. After signal processing, the primary side current data and the secondary side current data are obtained respectively, and sent to the respective CPUs.

When working, the master and the slave are used in combination, and the acquisition lines of the master and the slave are respectively clamped on the wires on both sides of the current transformer through the open-loop coil. The terminal sends a request command to the host to obtain the transformation ratio of the current transformer, and sends the request command to the slave through the host, and the host and the slave collect the current data on both sides of the current transformer according to the received request command. The master and the slave transmit data through its Bluetooth communication unit. Specifically, the slave's Bluetooth communication unit transmits the measured secondary side current data to the host's processor through the master's Bluetooth communication unit. The data refers to the attached data. A digital signal with a time parameter; the processor of the host calls the data in the data archive, and the secondary side current data detected by the slave machine and the secondary side current data detected by the host machine and the secondary side current data detected by the slave machine are at the same time once. The side current data is calculated and processed to obtain the transformation ratio value of the two, and the primary side current data, the secondary side current data and the obtained transformation ratio value are uploaded to the terminal for display.

Among them, the Bluetooth communication unit can use the HC-08 of Guangzhou Huicheng Information Technology, a data transmission module based on the Bluetooth Specification V4.0BLE Bluetooth protocol; its wireless working frequency band is 2.4GHz ISM, the modulation method is GFSK, and the maximum transmit power of the module is 4dBm. The receiving sensitivity is -93dBm, and the ultra-long distance communication of 80 meters can be realized in an open environment.

The host and the slave of the current transformer ratio detection device provided by the embodiment of the present invention further include a casing assembly; the casing assembly includes a left casing, a right casing handle, a handle and a central axis; the upper part of the right casing handle is The right casing part, the lower part is the handle part; the left casing and the right casing are both arc-shaped hollow structures, and the left and right iron cores and their wires of the open-loop coil are respectively fixed on the left casing and the right casing. In the cavity; the bottom right end of the left casing overlaps with the left end of the middle part of the right casing handle, the central axis passes through the overlapping part of the two, and the right casing handle can be rotated relative to the left casing, so that the right casing part and the The left shell is closed into a ring or the top is separated; when the right shell part and the left shell are closed into a loop, the open-loop coil is closed into a loop; when the right shell part and the top of the left shell are separated, the open-loop coil is opened; the upper end of the handle It has a U-shaped groove; the lower end of the left casing is fixed in the U-shaped groove, and the middle part of the handle of the right casing is located in the U-shaped groove; when the handle part is pressed, the right casing part rotates, and its top is separated from the top of the left casing; The handle part is lifted, the right housing part is rotated, and its top end is closed with the left housing into a ring.

The host and the slave of the current transformer ratio detection device also include a reset assembly; the reset assembly includes a fixing rod and a torsion spring; the fixing rod is arranged inside the handle of the right case, at its middle position, and is connected to the front and rear of the handle of the right case. The surface is vertical; the torsion spring is sleeved on the fixed rod, and has a first support arm and a second support arm; the end of the first support arm abuts on the outer wall of the central shaft; the inside of the handle has a gear plate, and the second support arm The end of the gear rests against the left side of the gear plate; press the handle, the second arm compresses toward the first arm, release the handle, the second arm resets, and drives the handle to lift to its original position, wherein, There is a limit hole in the middle of the handle of the right shell; the hole of the limit hole is perpendicular to the front surface of the handle of the right shell; the fixing rod is arranged in the limit hole, and the first support arm and the second support arm extend from the hole wall of the limit hole The hollowed-out part extends into the inside of the handle of the right case.

The current transformer transformation ratio detection device provided by the present invention has the terminal, the host and the slave all portable terminal equipment, the structure design is compact, the volume is novel, and the planning is reasonable; in the application detection process in the power system field, the terminal has strong mobility. , Can adapt to different environments, ensure safety, and detect current data at the same time, with high reliability, simple operation, and can quickly and real-time obtain the transformation ratio on both sides of the current transformer.

It should be noted that the terminal in the embodiment of the present invention may be a mobile handheld terminal or other fixed remote terminal.

Embodiment 2:

As shown in Figures 4, 5, 6 and 7, an embodiment of the present invention further provides a method for detecting the transformation ratio of a current transformer, including the following steps:

Step 1: Establish a communication link with the host, which may specifically include the following steps:

Perform Bluetooth pairing between the terminal and the host according to the preset Bluetooth matching information: if the Bluetooth pairing is successful, it indicates that the communication link has been established; otherwise, erase the current Bluetooth matching information, and perform the Bluetooth pairing again according to the following steps:

(a) Reconfigure the Bluetooth matching information of the terminal;

Check whether the Bluetooth matching information configuration item in the terminal menu is correct. If it is not correct, the Bluetooth matching information can be reconfigured through the key processing unit of the terminal.

(b) Send the test command for Bluetooth pairing to the host, so that the host automatically sends the same test command to the slave after receiving the test command;

(c) Receive the matching status of the master and the slave fed back by the master. If the matching is passed, it indicates that the communication link has been established; otherwise, return to step (a).

Step 2: send a current transformer ratio detection request to the host, collect the current data of the primary side of the current transformer through the host, and obtain the current data of the secondary side of the current transformer at the same time from the slave through the host;

Among them, the slave collects the secondary side current signal through the signal collector, performs numerical processing, obtains the secondary side current data, and reports the processed data to the master through the Bluetooth communication unit of the slave; the master collects and communicates with the slave through the signal collector. The primary side current signal at the same time of the collected secondary side current data is processed numerically to obtain the primary side current data and the processed data and the secondary side current data reported by the slave, and then the host computer based on the primary side current data and secondary side current data. The secondary side current data is calculated by the current transformer transformation ratio, and the current transformer transformation ratio is obtained, and the primary side current data, the secondary side current data and the current transformer transformation ratio are reported to the terminal together through the Bluetooth communication unit of the host.

Step 3: Receive the primary side current data, secondary side current data and current transformer transformation ratio reported by the host and output and display; it can be seen that the terminal can simultaneously display the current transformer primary side current data, secondary side current data and The transformation ratio of the current transformer; the transformation ratio of the current transformer is the transformation ratio of the current transformer calculated and obtained by the host according to the primary side current of the current transformer and the secondary side current of the current transformer.

In the above method, it is also possible to judge the abnormal transformation ratio of the current transformer according to the received transformation ratio of the current transformer, and obtain the change of the transformation ratio in the abnormal state of the current transformer. If the CT is normal, the terminal does not issue an instruction to obtain current data, and the host and slave collect and report the data by themselves; when the CT is abnormal, the terminal can issue an abnormal current transformer ratio command to the host, and send the command to the slave through the host. Send the command, the host acquires the primary side current data according to the abnormal command, and receives the secondary side current data collected by the slave according to the abnormal command, and then the host computer calculates the current transformer transformation ratio according to the primary side current data and the secondary side current data, and Report the primary side current data, the secondary side current data and the current transformer transformation ratio to the terminal, so as to ensure that the terminal can effectively detect the change of the current transformer transformation ratio in real time.

It should be noted that, the method for detecting the transformation ratio of the current transformer provided in this embodiment may be performed by a movable handheld terminal, and may also be performed by a fixed remote terminal.

Embodiment three:

The embodiment of the present invention also provides a terminal, including a processor and a storage medium;

the storage medium is used to store instructions;

The processor is configured to operate according to the stored instruction to execute the steps of the method for detecting the transformation ratio of the current transformer in the second embodiment.

Embodiment 4:

The present invention provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the steps of the current transformer ratio detection method in the second embodiment.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowcharts and/or block diagrams, and combinations of flows and/or blocks in the flowcharts and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in one or more of the flowcharts and/or one or more blocks of the block diagrams.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions An apparatus implements the functions specified in one or more of the flowcharts and/or one or more blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A current transformer transformation ratio detection device is characterized by comprising a host, a slave and a terminal;

the host is used for receiving a current transformer transformation ratio detection request issued by the terminal, collecting primary side current of the current transformer, collecting secondary side current of the current transformer at the same time through the slave, and calculating the transformation ratio of the current transformer according to the primary side current and the secondary side current of the current transformer;

the slave computer is used for collecting the current of the secondary side of the current transformer according to the instruction issued by the host computer and reporting the current to the host computer;

and the terminal is used for receiving the primary side current, the secondary side current and the transformation ratio of the current transformer reported by the host and outputting and displaying the current transformer.

2. The current transformer transformation ratio detection device according to claim 1, wherein the terminal comprises a terminal CPU, and a data bus interface, a Bluetooth communication unit and an LCD display unit which are connected with the terminal CPU, the terminal CPU is in communication connection with the host through the data bus interface, and the data bus interface comprises an image electronic LCD interface matched with the LCD display unit and a Bluetooth interface matched with the Bluetooth communication unit.

3. The apparatus according to claim 1, wherein the terminal, the master and the slave are respectively configured with a JTAG interface, and the master is communicatively connected to the terminal and the slave through the JTAG interface for performing an internal communication test.

4. The apparatus according to claim 1, wherein the terminal, the master and the slave are respectively provided with a power supply unit, and the power supply unit comprises a battery, a battery capacity detection unit for detecting a remaining power, and a battery conversion unit for converting the battery and an external power supply.

5. The current transformer transformation ratio detection device according to claim 1, wherein the host and the slave are respectively configured with respective signal acquisition units, and the signal acquisition units comprise a signal collector, an open-loop coil and a signal acquisition processing chip; the signal collector can collect the primary side/secondary side current of the current transformer through the open-loop coil and transmit the collected current signal to the signal collecting and processing chip for signal processing.

6. A current transformer transformation ratio detection method is characterized by comprising the following steps:

the terminal and the host establish a communication link;

the terminal issues a current transformer transformation ratio detection request to the host, collects primary side current of the current transformer through the host, and obtains secondary side current of the current transformer from the slave at the same moment through the host;

the terminal receives the primary side current and the secondary side current of the current transformer and the transformation ratio of the current transformer reported by the host computer and outputs and displays the transformation ratio, wherein the transformation ratio of the current transformer is obtained by the host computer according to the primary side current and the secondary side current of the current transformer.

7. The method for detecting the transformation ratio of the current transformer according to claim 6, wherein the method for the terminal to establish the communication link with the host comprises the following steps:

according to preset Bluetooth matching information, carrying out Bluetooth pairing on the terminal and the host: if the pairing is unsuccessful, erasing the current Bluetooth matching information, and performing Bluetooth pairing again according to the following steps:

(a) reconfiguring Bluetooth matching information of the terminal;

(b) the terminal issues a test instruction for carrying out Bluetooth pairing to the host machine, so that the host machine automatically issues the test instruction to the slave machine after receiving the test instruction;

(c) the terminal receives the Bluetooth matching state of the host and the slave fed back by the host, and if the Bluetooth matching state passes, the communication link is established; otherwise, returning to the step (a).

8. The method for detecting the transformation ratio of the current transformer according to claim 6, further comprising:

and carrying out abnormal judgment on the transformation ratio of the current transformer according to the received transformation ratio of the current transformer, and acquiring the change of the transformation ratio of the current transformer in an abnormal state.

9. A terminal comprising a processor and a storage medium;

the storage medium is used for storing instructions;

the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 6 to 8.

10. Computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 6 to 8.

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