In national standard

it is emphasized that the deviation of the amplitude of voltage in three-phase powersupply system

including 10 kV and the lowers

must be smaller than ±7%.As for long-distance radical distribution circuits that connect with heavy loads and have low power factor

voltage amplitude will be below the limit

9.3 kV.Kinds of measures can be taken to compensate voltage

such as installing series compensation and shunt compensating device

or adopting off-load-tap-changing transformer and on-load-tap-changing transformer.For the circuits at the end of which voltage amplitude drops much

it’ s necessary to adopt several measures simultaneously to satisfy the requirement of national standard.Taking a typical 10 kV radial distribution circuits for example

the paper adopts EMTP-ATP software to simulate the voltage compensation effect of series compensation device

shunt compensation device and transformer voltage regulation on the line during system steady operating.An effective integrated voltage-regulating scheme is presented to improve the voltage loss along the line.