CN-122017439-A - Merging unit for metering and metering system

CN122017439ACN 122017439 ACN122017439 ACN 122017439ACN-122017439-A

Abstract

The invention discloses a metering merging unit and a metering system, and relates to the technical field of electric power metering, wherein the metering merging unit comprises a case provided with a plurality of slots for being connected with a metering board card, a main control board arranged in the case and at least one metering board card; the main control board is respectively connected with the hot plug connectors and used for detecting the board card in-place state of each slot and executing initialization operation or removal operation according to the board card in-place state, the metering board card and the slots can be arranged in a pluggable manner, the hot plug connectors are provided with a plurality of pins with different lengths, the pins with the longest length are grounded pins, when the slots are connected with the metering board card, the metering board card establishes an electric connection path with the main control board through the pins, and the metering board card is used for receiving analog signals, processing the analog signals and outputting the analog signals to the main control board through the pins. The invention aims to improve the precision, reliability and operation and maintenance efficiency of a merging unit for metering.

Inventors

SONG BINGRUI
Zheng Zeyao
MA JIN
ZHAO TING
LI JUN
SHEN QIANG
MIAO YUFEI
WANG HONGMEI
LI SUXIA
Zang Yunxuan
SHI KAIYU
NIE XIAOLONG
YAN YAKUN
WANG XIAOFENG
HAN YING
WANG YUANYUAN
ZHANG HAIZHOU
NIU JIAHUI
YANG ZEBIN
MA QIANG

Assignees

国网山西省电力有限公司长治供电分公司

Dates

Publication Date: 20260512
Application Date: 20260416

Claims (10)

1. A metering merging unit, characterized in that it comprises: the device comprises a case, wherein a plurality of slots for accessing a metering board card are formed in the case, and a hot plug connector is correspondingly connected to each slot in the case; The main control board is arranged in the case and is electrically connected with the hot plug connectors respectively; The main control board is used for being in communication connection with external equipment, detecting the board card in-place state of each slot, and executing initialization operation or removal operation according to the board card in-place state; At least one metering board card, wherein the metering board card and the slot are arranged in a pluggable manner; The hot plug connector is provided with a plurality of pins with different lengths, the longest pin in the pins is a grounding pin, and under the condition that the slot is connected with the metering board card, the metering board card establishes an electric connection path with the main control board through the pins; The metering board card is used for receiving the analog signals output by the external sensor, processing the analog signals and outputting the processed analog signals to the main control board through a plurality of pins on the hot plug connector.
2. The metering combination unit of claim 1, wherein the metering board card comprises: the input interface is used for accessing analog signals output by the external sensor; The signal conditioning circuit is electrically connected with the input interface and is used for receiving the analog signal and outputting a corresponding preprocessing signal after performing signal preprocessing on the analog signal; the analog-to-digital converter is electrically connected with the signal conditioning circuit and is used for carrying out analog-to-digital conversion on the preprocessing signal and then outputting a corresponding digital signal; The signal processing unit is electrically connected with the analog-to-digital converter; the signal processing unit is used for controlling the sampling time sequence of the analog-to-digital converter, carrying out error compensation processing on the digital signal, packaging the digital signal subjected to the error compensation processing into a digital message according to a preset protocol, and outputting the digital message to the main control board through a plurality of pins on the hot plug connector.
3. The metering combination unit of claim 2, wherein the signal processing unit comprises: the clock synchronization module is used for receiving an external pulse reference signal, performing signal processing on the pulse reference signal and then outputting a corresponding local sampling clock signal; The sampling control module is electrically connected with the clock synchronization module and is used for outputting a corresponding sampling control signal to the analog-to-digital converter according to the local sampling clock signal so as to control the sampling time sequence of the analog-to-digital converter; the error compensation module is electrically connected with the analog-to-digital converter and is used for receiving external correction parameters and carrying out error compensation processing on the digital signals according to the external correction parameters; The message framing module is electrically connected with the error compensation module and is used for packaging the digital signals subjected to error compensation processing into digital messages according to a preset protocol and outputting the digital messages to the main control board.
4. A metering combining unit as claimed in claim 3, wherein the signal processing unit further comprises: the self-checking control module is respectively and electrically connected with the analog-to-digital converter and the error compensation module; A first input end of the switching circuit is used for being connected with an external sensor, a second input end of the switching circuit is used for being connected with an internal reference voltage, an output end of the switching circuit is electrically connected with an input end of the analog-to-digital converter, the switching circuit is used for conducting the electric connection between the first input end and the output end or conducting the electric connection between the second input end and the output end; the analog-to-digital converter is used for sampling the internal reference voltage and outputting a corresponding sampling signal to the self-checking control module under the condition that the change-over switch circuit is used for conducting the electrical connection between the second input end and the output end; the self-checking control module is used for comparing the sampling signal with a preset sampling value and outputting a corresponding error comparison result to the error compensation module so that the error compensation module performs error compensation processing on the digital signal according to external correction parameters and the error comparison result.
5. The metering combination unit of claim 2, wherein the metering board further comprises: The storage module is electrically connected with the signal processing unit and is used for storing at least one of identity information, production information and external correction parameters of the metering board card.
6. The metering combination unit of claim 2, wherein the metering board further comprises: The digital temperature sensor is electrically connected with the signal processing unit; The digital temperature sensor is used for detecting the temperature of the metering board card and outputting a corresponding temperature detection signal to the signal processing unit.
7. The metering combination unit of claim 1, further comprising a status indicator light electrically connected to the main control board, the main control board being configured to control the status indicator light to operate/stop according to the board card in-place status.
8. The metering combination unit according to any one of claims 1 to 7, further comprising a communication bus through which the main control board and the metering board card are communicatively connected; the main control board is used for detecting the board card in-place state of each slot through the communication bus and executing initialization operation or removal operation according to the board card in-place state.
9. The metering combining unit according to any one of claims 1 to 7, further comprising: the reference voltage source is electrically connected with the metering board card; The reference voltage source is used for providing an internal reference voltage to the metering board card.
10. A metering system comprising the metering combination unit according to any one of claims 1 to 9, and an external device; The external equipment is in communication connection with the main control board of the metering merging unit and is used for sending external correction parameters to the main control board under the condition of receiving an external trigger signal so that the main control board outputs the external correction parameters to the metering board card.

Description

Merging unit for metering and metering system Technical Field The invention relates to the technical field of electric power metering, in particular to a metering merging unit and a metering system. Background In the construction of intelligent transformer stations and digital power grids, a metering Merging Unit (MU) is used as core equipment of a process layer, and is used for synchronously collecting and digitizing analog signals output by an electronic transformer and transmitting the analog signals to a spacer layer and a station control layer according to a standard protocol (such as IEC 61850-9-2 LE), so that the intelligent transformer station control system is a data source for realizing accurate metering, state monitoring and intelligent control of electric energy. However, the existing merging units commonly adopt an integrated architecture of a front-end sampling channel shared by functions of metering, protection, measurement and control, and the like, so that a metering loop is easily protected or the metering loop is easily interfered by large dynamic signals, switching noise, and the like, and the severe requirement of power transaction on high-precision metering is difficult to meet. Most notably, conventional merging units lack the ability to modularize and independently operate. When the metering function needs to be calibrated, upgraded or fails, the whole machine is required to be cut off and shut down, so that the continuity of key services such as protection, measurement and control is interrupted, and the operation and maintenance efficiency is obviously reduced. Disclosure of Invention The invention mainly aims to provide a metering merging unit and a metering system, which aim to improve the precision, reliability and operation and maintenance efficiency of the metering merging unit. In order to achieve the above object, the present invention provides a metering merging unit, including: the device comprises a case, wherein a plurality of slots for accessing a metering board card are formed in the case, and a hot plug connector is correspondingly connected to each slot in the case; The main control board is arranged in the case and is electrically connected with the hot plug connectors respectively; The main control board is used for being in communication connection with external equipment, detecting the board card in-place state of each slot, and executing initialization operation or removal operation according to the board card in-place state; At least one metering board card, wherein the metering board card and the slot are arranged in a pluggable manner; The hot plug connector is provided with a plurality of pins with different lengths, the longest pin in the pins is a grounding pin, and under the condition that the slot is connected with the metering board card, the metering board card establishes an electric connection path with the main control board through the pins; The metering board card is used for receiving the analog signals output by the external sensor, processing the analog signals and outputting the processed analog signals to the main control board through a plurality of pins on the hot plug connector. In one embodiment, the metering board card includes: the input interface is used for accessing analog signals output by the external sensor; The signal conditioning circuit is electrically connected with the input interface and is used for receiving the analog signal and outputting a corresponding preprocessing signal after performing signal preprocessing on the analog signal; the analog-to-digital converter is electrically connected with the signal conditioning circuit and is used for carrying out analog-to-digital conversion on the preprocessing signal and then outputting a corresponding digital signal; The signal processing unit is electrically connected with the analog-to-digital converter; the signal processing unit is used for controlling the sampling time sequence of the analog-to-digital converter, carrying out error compensation processing on the digital signal, packaging the digital signal subjected to the error compensation processing into a digital message according to a preset protocol, and outputting the digital message to the main control board through a plurality of pins on the hot plug connector. In an embodiment, the signal processing unit comprises: the clock synchronization module is used for receiving an external pulse reference signal, performing signal processing on the pulse reference signal and then outputting a corresponding local sampling clock signal; The sampling control module is electrically connected with the clock synchronization module and is used for outputting a corresponding sampling control signal to the analog-to-digital converter according to the local sampling clock signal so as to control the sampling time sequence of the analog-to-digital converter; the error compensation module is electrically connected with the analog-to