CN111624398A - Distribution line loss acquisition module and system - Google Patents

Abstract

The invention is suitable for the field of electric power technology, and provides a distribution line loss acquisition module, which includes a microprocessor; a metering unit communicates with the microprocessor, and is provided with a voltage and current sampling signal input interface and a pulse output interface, which are used for For measuring active power value, reactive power, active energy and reactive energy, and measuring active power rms, voltage and current rms, line frequency and zero-crossing interruption; storage unit, communicates with microprocessor, is used for data analysis storage; and a power supply unit for supplying power to the above components, the beneficial effects of the present invention are: the line loss acquisition module is installed in the distribution automation terminal, and the module used for providing the power information required for line loss calculation can be monitored in real time. The power data is uploaded and uploaded without modifying the entire grid construction framework, which can effectively improve the level of line loss management, reduce line losses, and promote the economic operation of the entire power grid.

Description

A distribution line loss acquisition module and system

technical field

The invention relates to the field of electric power technology, in particular to a distribution line loss collection module and system.

Background technique

Electricity is the center of the development of the energy industry. As a convenient and high-quality secondary energy, electric energy has been widely used in various fields of national production.

The voltage level is 10kV and above, the current and voltage transformers are used to obtain the corresponding current and voltage data from the high-voltage equipment, and the current and voltage data are imported into the electric energy metering device composed of the electric energy meter through the secondary line. However, in practical applications, the problem of negative line loss still occurs. The reason is that measurement is a system, including current transformers, voltage transformers, secondary circuits, energy meters, and the power acquisition terminals behind. Most of the problems are It is not caused by individual equipment, but the problem of system coordination, because electric energy measurement is a comprehensive error.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a distribution line loss collection module and system, which aims to solve the problems of inaccurate measurement and comprehensive errors in the existing electric energy measurement device.

The embodiment of the present invention is implemented in this way, a distribution line loss collection module, including:

microprocessor;

The metering unit communicates with the microprocessor, and is provided with a voltage and current sampling signal input interface and a pulse output interface, which are used to measure the active power value, reactive power, active energy and reactive energy, and measure the effective value of active power , RMS voltage and current, line frequency and zero-crossing interruption;

a storage unit, in communication with the microprocessor, for storing data; and

A power supply unit for supplying power to the above components.

As a further solution of the present invention: a clock circuit is further provided in the microprocessor for associating time with the stored data.

As a further solution of the present invention: the power supply unit includes:

mains power supply to provide a wide range of power supply; and

The clock backup power supply is used to provide power to the clock circuit in the event of a mains power failure.

As a further solution of the present invention: an output module is also included, and the output module at least includes several indicator lights for indicating the running state, the power state, the active power and the reactive power.

Another object of the embodiments of the present invention is to provide a distribution line loss collection system, which includes an FTU system, and also includes the distribution line loss collection module in communication with the FTU system.

As a further solution of the present invention: the FTU system communicates with the distribution line loss acquisition module through a communication module.

As a further solution of the present invention, a lightning protection device is also arranged in the communication module.

Compared with the prior art, the beneficial effects of the present invention are: the line loss acquisition module is installed in the distribution automation terminal, and the module used for providing the power information required for the line loss calculation can monitor the power data in real time and upload it, without the need for Modifying the entire power grid construction framework can effectively improve the level of line loss management, reduce line losses, and promote the economic operation of the entire power grid.

Description of drawings

FIG. 1 is a schematic structural diagram of a distribution line loss acquisition module.

FIG. 2 is a schematic structural diagram of a distribution line loss collection system.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

As shown in FIG. 1, a structural diagram of a distribution line loss acquisition module provided by an embodiment of the present invention includes a microprocessor, a metering unit, a storage unit, and a power supply unit, and the metering unit communicates with the microprocessor, There are voltage and current sampling signal input interfaces and pulse output interfaces on it, which are used to measure active power value, reactive power, active energy and reactive energy, as well as measure active power RMS, voltage and current RMS, line frequency and The zero-crossing is interrupted; the storage unit communicates with the microprocessor, and is used for storing data; the power supply unit is used for supplying power to the above components.

The metering unit has a built-in domestic HT7038 chip with high precision and high reliability. HT7038 can measure active power, reactive power, active energy, and reactive energy, and can provide 3 independent channels of active power and RMS, voltage and current RMS, Line frequency, zero-crossing interruption, etc., can realize a flexible anti-theft scheme; and supports all-digital gain, phase and offset correction, active and reactive energy pulses are output from PF and QF pins respectively. The metering unit communicates with the microprocessor via serial SPI. The microprocessor can read the operating parameters of the metering unit in real time through the SPI port, and record the event when an abnormality occurs.

Due to the many functions of the line loss acquisition module and the complex implementation, a large amount of data will be generated during operation. The real-time monitoring of voltage, current, power, power factor, parameters, calibration parameters, remote signaling, and telemetry data are stored in the EEPROM Storage; such as December historical power data, event record data, frozen volume data, etc., stored in the FLASH chip. Because the line loss acquisition module monitors a lot of data, the selected memory chip must have a large capacity, high reliability, long storage time, and low power consumption. It is preferable to use 24C512 low-power serial memory chip, use I2C interface to communicate with the microprocessor, its standby current and working current are 1μA and 1mA respectively, the storage capacity can reach 64kB bytes, 100,000 times of erasing and writing, and data retention time over 200 years.

As shown in FIG. 1 , as a preferred embodiment of the present invention, the microprocessor is further provided with a clock circuit for associating time with the stored data.

As shown in FIG. 1 , as a preferred embodiment of the present invention, the power supply unit includes a main power supply and a clock backup power supply, and the main power supply is used to provide a wide range of power supply; the clock backup power supply is used in the main power supply Provides power to the clock circuit in the event of a failure.

Due to the requirement of accurate timing, the power supply of the line loss acquisition module is divided into two parts. The main power supply is preferably an isolated switching power supply, which can not only ensure a wide range of power supply, but also enable the external power supply and microprocessor power supply. Electrical isolation can ensure that the interference of the external power supply will not cause damage to the core part of the microprocessor, especially the stored data; the other part is provided by the clock backup power supply when the main power supply is invalid to meet the To meet the needs of the clock circuit of the line loss acquisition module, the clock backup power supply does not need to be replaced during the life cycle of the line loss acquisition module, and the correct working time of the internal clock circuit should be maintained for not less than 5 years after a power failure.

As shown in FIG. 1 , as a preferred embodiment of the present invention, the output module at least includes several indicator lights for indicating the running state, the power state, active power and reactive power.

Indicator lights should use bright, long-life LEDs as indicators. For example, in one case of this embodiment:

1) Active energy pulse indicator: red; usually off, flashes when measuring active energy.

2) Reactive energy pulse indicator: red; usually off, flashing when measuring reactive energy.

3) Working power indicator: red; it is always on when the working power is powered, and off when there is no power.

4) Running indicator light: green; normally, the flashing frequency is 1Hz.

Among them, the active energy pulse indicator is used to indicate the user's power consumption, the pulse output is used for meter calibration and measurement, and the power pulse output circuit and multi-function port output circuit can be realized by ordinary I/O plus optocoupler isolation.

As shown in FIG. 2, an embodiment of the present invention further provides a distribution line loss collection system, including an FTU system, and also includes the distribution line loss collection module that communicates with the FTU system; the FTU system communicates with the FTU system through the communication module. The power distribution line loss acquisition module communicates; the communication module is also provided with a lightning protection device.

In this embodiment, RS232 or RS485 transmission is used as the communication module to add a lightning protection device to the RS485 bus interface. The RS485 interface chip used is the HM3085 chip, which is isolated from the single-chip microcomputer system through the optocoupler, so as to prevent the entire system from being damaged when struck by lightning. Connected, the FTU system uses the DL/T634.5101-2002 protocol to issue command information, and the line loss acquisition module receives the information matching its own address, and then packs the response information and its check code to the FTU system.

When the power-on detection analog port detects that the FTU system is powered, the line loss collection and collection runs at full speed, communicates with the metering chip HT7038 through the SPI port, and reads the running status of the meter in real time, such as real-time voltage, current value, power, power factor, etc. , and judge whether it is within the normal working range. If there is an abnormality, read the information of the clock circuit, and then store these data in the memory chip 24LC512 through I2C communication. When the line loss acquisition module receives the RS485/RS232 communication channel, the format is sent The command data of DL/T634.5101-2002 is analyzed by the line loss acquisition module through the protocol, and the data in 24C512 is read through I2C communication. After packaging, it is uploaded through the RS485/RS232 communication channel. After the power supply of the FTU system disappears, the power supply is switched to the clock backup Power on, turn off the internal high-speed clock, start the low-speed clock, turn off peripheral functions, and enter a low-power working state.

The above embodiments of the present invention provide a distribution line loss collection module, and a distribution line loss collection system based on the module. The line loss collection module is installed in a distribution automation terminal and is used to provide a line loss calculation method. The module of power demand information can monitor and upload power data in real time without modifying the entire grid construction framework, which can effectively improve the level of line loss management, reduce line losses, and promote the economic operation of the entire power grid.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (7)

1. a power distribution line loss acquisition module, is characterized in that, comprises: microprocessor; The metering unit communicates with the microprocessor, and is provided with a voltage and current sampling signal input interface and a pulse output interface, which are used to measure the active power value, reactive power, active energy and reactive energy, and measure the effective value of active power , RMS voltage and current, line frequency and zero-crossing interruption; a storage unit, in communication with the microprocessor, for storing data; and A power supply unit for supplying power to the above components. 2 . The power distribution line loss acquisition module according to claim 1 , wherein the microprocessor is further provided with a clock circuit for correlating time for the saved data. 3 . 3. A power distribution line loss acquisition module according to claim 2, wherein the power supply unit comprises: mains power supply to provide a wide range of power supply; and The clock backup power supply is used to provide power to the clock circuit in the event of a mains power failure. 4. A distribution line loss acquisition module according to claim 1, 2 or 3, characterized in that it further comprises an output module, the output module at least includes a module for indicating running state, power supply state, active power and no power. Several indicator lights for power. 5 . A distribution line loss collection system, comprising an FTU system, characterized in that, further comprising a distribution line loss collection module according to any one of claims 1 to 4 that communicates with the FTU system. 6 . 6 . The distribution line loss collection system according to claim 5 , wherein the FTU system communicates with the distribution line loss collection module through a communication module. 7 . 7 . The power distribution line loss collection system according to claim 6 , wherein the communication module is further provided with a lightning protection device. 8 .

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