What Are High-Voltage Supply with High-Voltage Metering and High-Voltage Supply with Low-Voltage Metering
I. Definitions and Working Principles
(1) High-Voltage Supply with High-Voltage Metering
Refers to high-voltage power supply with metering on the high-voltage side. The energy metering device is directly installed on the high-voltage side of the power system, suitable for dedicated transformer users receiving high-voltage supply such as 10kV.
Principle: Current transformers (CT) and voltage transformers (PT) convert the high current and voltage of the high-voltage line into low-voltage, low-signal levels compatible with the electricity meter, enabling precise measurement.
(2) High-Supply Low-Metering
Refers to high-voltage supply with low-voltage side metering. After high-voltage transmission, the metering device is installed on the low-voltage side of the user's distribution room. Suitable for high-voltage supply scenarios.
Principle: After voltage reduction via a transformer, only the low-voltage side current is measured using a CT. Combined with a fixed low-voltage side voltage value, this calculates energy consumption without requiring a PT.
II. Applicable Scenarios
(1) High-Supply High-Metering
Primarily suited for large factories and enterprises with high electricity consumption and stringent metering accuracy requirements. It supports line loss accounting and grid dispatch optimization. Applicable only to industrial and mining enterprises with stable loads, high load factors, and continuous three-shift production. Not suitable for rural users or non-continuous production enterprises.
(2) High-Supply Low-Metering
Targeted at small-to-medium enterprises and residential areas with lower electricity consumption. Requires step-down power supply at the user end and moderate metering accuracy. Widely adopted in such scenarios due to simple installation, low cost, and ease of operation.
III. Comparative Analysis of Advantages and Disadvantages
(1) High-Voltage Supply with High-Voltage Metering
Advantages: High metering accuracy accurately reflects energy consumption on high-voltage lines, reducing errors caused by losses and providing reliable data for grid management; Strong controllability simplifies management processes, effectively prevents electricity theft, and safeguards the rights of power suppliers.
Disadvantages: High installation and maintenance costs with stringent requirements for equipment precision; Incompatible with tiered pricing structures, making it unsuitable for scenarios requiring separate metering; Difficulties in matching CTs with loads may cause measurement distortion or equipment damage; PT secondary voltage drops are highly susceptible to environmental factors, impacting measurement accuracy.
(2) High-Supply Low-Metering
Advantages: Cost-effective with low equipment investment and operational costs, offering high value for money; Suitable for small-to-medium-sized scenarios without complex high-voltage metering configurations; Devices located on the low-voltage side enable safer and more convenient maintenance.
Disadvantages: Metric errors occur, as transformer operational losses are not included in metering; Limited accuracy fails to meet high-precision metering requirements; Weak anti-theft capabilities, as metering devices are positioned at the user end, increasing electricity theft risks.
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