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High-voltage electric energy metering device

A metering device and high-voltage electric energy technology, which is applied in the field of substation metering, can solve problems such as calculation errors, system errors, and digital electric energy meters that are afraid of errors, and achieve the effects of improving detection accuracy, improving measurement accuracy, and ensuring reliability

Pending Publication Date: 2021-03-26
STATE GRID HUBEI MARKETING SERVICE CENT (MEASUREMENT CENT)
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] However, due to the existence of links such as errors in voltage transformers and current transformers, conversion errors in merging units, error codes in the transmission process, and calculation errors in digital energy meters, the electric energy metering system in digital substations will produce certain System error, so it is necessary to calibrate the power error of the digital substation

Method used

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Embodiment 1

[0031] Such as figure 1 As shown, a high-voltage electric energy metering device of the present invention, three-phase voltage transformer, standard voltage transformer, three-phase current transformer, standard current transformer, first signal processing module, second signal processing module, first combined unit, a second merging unit, a GPS receiving module, a photoelectric converter, an electro-optical converter and an FPGA chip.

[0032] The three-phase voltage transformer converts the high voltage on the primary side of the power grid into a low voltage, and transmits it to its secondary side, which is measured by the secondary side measuring instrument. The three-phase current transformer converts the large current on the primary side of the power grid into a small current, and transmits it to the secondary side, which is measured by the secondary side measuring instrument. Since the three-phase voltage transformer and the three-phase current transformer must ensure ...

Embodiment 2

[0045] On the basis of Embodiment 1, in this embodiment, since the standard signal output by the standard voltage transformer is 100V, and the standard signal output by the standard current transformer is 4A, in order to facilitate the first signal processing module and the second signal processing module to perform Preprocessing, therefore, it is necessary to process the output signals of the standard voltage transformer and the standard current transformer so that the signal voltage input to the FPGA chip is 2.5V.

[0046] Such as figure 2 As shown, the first signal processing module includes a first resistor divider circuit, a first impedance matching circuit, a first gain adjustment circuit, a first differential amplifier circuit, a first differential filter circuit and a first A / D conversion circuit connected in sequence The second signal processing module includes a second resistance voltage divider circuit, a second impedance matching circuit, a second gain adjustment ...

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Abstract

The invention provides a high-voltage electric energy metering device; standard signals are provided for detection signals of a three-phase voltage transformer and a three-phase current transformer byarranging a standard voltage transformer and a standard current transformer, and a ratio difference and an angular difference between the detection signals of the three-phase voltage transformer andthe three-phase current transformer and the standard signals are calculated, so that errors of the three-phase voltage transformer and the three-phase current transformer are obtained, and the measurement precision of the system is improved; a GPS receiving module is arranged to be used for synchronizing a first merging unit, a second merging unit, a first signal processing module and a second signal processing module, synchronous sampling of all channels is achieved, and the error detection precision is improved.

Description

technical field [0001] The invention relates to the technical field of substation metering, in particular to a high-voltage electric energy metering device. Background technique [0002] With the rapid development of substation automation and network communication technology, and the promulgation and implementation of the IEC61850 standard system, traditional substations have gradually transitioned to digital substations. The electric energy technology of the digital substation realizes the transformation from analog to full digital in the collection, and transmits it through the optical fiber line, and transmits it to the digital electric energy meter through point-to-point or Ethernet, which provides a data source for the electric energy metering system in the digital substation. Digital substation electric energy metering system. [0003] However, due to the errors of voltage transformers and current transformers, the conversion error of the merging unit, the fear of err...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R22/06G01R35/04G01R19/25
CPCG01R19/25G01R22/06G01R22/061G01R35/04
Inventor 鄢烈奇唐登平明东岳姚鹏李俊王尚鹏夏天李君庞博郑欣汪司珂王信王琪汪应春余鹤
Owner STATE GRID HUBEI MARKETING SERVICE CENT (MEASUREMENT CENT)
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