Study on Noise Prediction Model and Control Schemes for Substation

Table 1

Lanchow 330 kV substation noise control plan.

Items	Constitution	Sound power level before noise reduction	Sound power level after noise reduction	Service condition
Plan A	Firewalls	Transformer 99 dBA; Reactor 85 dBA	Transformer 99 dBA; Reactor 85 dBA	Conventional design
Plan B	Plan A + reactor Box-in technique	Transformer 99 dBA; Reactor 85 dBA	Transformer 99 dBA; Reactor 70 dBA	HVDC station and substation have begun to practice
Plan C	Plan A + transformer Box-in technique	Transformer 99 dBA; Reactor 85 dBA	Transformer 84 dBA; Reactor 85 dBA	HVDC station has begun to practice, substation has not been applied
Plan D	Plan B + transformer Box-in technique	Transformer 99 dBA; Reactor 85 dBA	Transformer 84 dBA; Reactor 70 dBA	HVDC station has begun to practice, substation has not been applied

HVDC station: high voltage direct current transmission substation.