Petersenova cívka s regulátorem REG-DP

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Operating Instructions for the Petersen-Coil Regulator

Vydal: EBERLE Controls GmbH

Strana 19 z 272

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This done setting the coil (in the grid's healthy state) inductive resistance that corresponds approximately the grid's capacitive resistance XC. In the past, the only controlled variable that was used regulate coil was the absolute value the zero sequence voltage UNE. (For more information, please see the chapter Current injection). Medium voltage grids should compensated much possible that only the residual current flows across the faulty section when earth fault occurs. Overcompensation and undercompensation are only recommended for special applications or overhead transmission grids with higher unbalance. But the load can still affect the zero sequence voltage and cause flicker. The main advantage this technique the ability continue operating the network dur- ing single pole-to-earth fault.1 The basics resonant earthing In medium and high voltage grids, Petersen coils are used compensate the capacitive current across the faulty section similarly large counter-flowing inductive current when a single phase-to-earth fault occurs.1 Definitions REG-DP/ REG-DPA Regulator for P-coil EOR-D Earth fault detection relay CI Current injection CIC Current injection controller ASC Arc suppression coil (Petersen coil, P-coil) 'UNE' Large index for primary quantities 'Une' Small index for secondary quantities HPCI High-power current injection (for regulation and location detection) 6. This why other techniques have used to regulate the coil. . 6. Although this was the obvious thing do, it doesn’t always achieve the desired result today's grids.2 The basics regulating P-coil Neutral point treatment with P-coil one the most important ways improving the voltage quality power grids.2. The increase power lines has balanced the grids and reduced the zero sequence voltage.Page 19 Applications 6