Default Value for Text Field

Hi

How i can set default value for a text field, i configured to set placeholder though now need to set default value for text field. Please help!

array(

            "name" => "adverts_person",

            "type" => "adverts_field_text",

            "order" => 10,

            "label" => __( "Contact Person", "adverts" ),

            "is_required" => true,

			"placeholder" => "SBACC",

			"set_value" => "SBACCCCC",

            "validator" => array( 

                array( "name" => "is_required"),

            )

https://ww.wp.xz.cn/plugins/wpadverts/