Resistance phasing method for medium-voltage distribution line looped network
A technology for power distribution lines and lines, which is applied to the phase angle between voltage and current, the measurement of grounding resistance, the measurement of electrical variables, etc., to achieve the effect of safe test method and less workload
Inactive Publication Date: 2010-12-22
XUANCHENG POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER +1
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Problems solved by technology
[0005] 1. Power substations, switching stations, main transformers, cable junction cabinets, etc. after new installation, relocation or overhaul, and when wiring groups and internal connections have been changed
[0006] 2. The power line is newly built, changed or changed, especially when the wiring of the cable line has been changed after the overhead line has been transformed into a cable line in recent years
As a result, the phasing of power distribution single-circuit lines can only be determined comprehensively through phasing tests on cables at each connecting section and inspection phasing of overhead lines.
Method used
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[0030] In this embodiment, a clamp-type grounding resistance meter is used to measure the phase-to-phase or phase-to-phase intermediate frequency ring network resistance.
[0031] The clamp-type grounding resistance meter, which is widely used at present, is used to measure the grounding resistance of any loop system. The instrument itself can generate a power supply potential, which can induce current in any loop system. Therefore, its measurement principle is briefly One is the whole circuit Ohm's law, which measures the loop resistance value of the loop system. There are two independent coils inside the instrument, one generates a high-frequency AC voltage e, and establishes a potential E in the measurement circuit, which is equivalent to a power transformer, which generates a total current I in the circuit, which is received by the other coil, and its function is equivalent to Electricity sensor, then measure the loop resistance of the loop: RLOOP=E / I=(e / i)×constant. The ...
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The invention discloses a resistance phasing method for a medium-voltage distribution line looped network, which is characterized by comprising the following steps: sequentially carrying out three-phase unbalanced short-circuit grounding on a three-phase impedance parameter-balanced line to be measured, which is isolated due to power outage, thus artificially causing the three-phase unbalance of impedance parameters of the line; and measuring with a mid-frequency electric quantity, and comparing the measurement of obviously different mid-frequency impedance data to determine the phase of a point to be phased in the line relative to the definite phase of a power. By using the method, the phasing of any point in a distribution single line can be completed in a short time without large quantities of line disconnecting operations and isolation power distribution equipment.
Description
technical field [0001] The invention relates to a line phasing method applied in a power distribution network, and is a test operation required in power production maintenance and construction. Background technique [0002] In the power supply system, optimizing the distribution network structure is an important means to save energy, reduce loss and improve power supply reliability. The three-phase phase of the industrial frequency power supply A, B, and C connected to the distribution network is the same, which is the premise of realizing "hand in hand", ring network, chain network power supply, and "dual power supply" and "multiple power supply" ring network power supply. is one of the prerequisites. [0003] With the vigorous advancement of the city's optimized power distribution network project, the current distribution network line has gradually realized the "hand in hand" ring network power supply through the switching station, ring network cabinet, section cabinet, a...
Claims
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IPC IPC(8): G01R25/00G01R27/20
Inventor 周刚王斌艾飞李永祥
Owner XUANCHENG POWER SUPPLY COMPANY OF STATE GRID ANHUI ELECTRIC POWER