To disable hyper links in comment section of Wordpress need to follow below two steps.
1. Open functions.php in the theme which you are using.
2. Place the below code in functions.php and save it.
add_filter('comment_text', 'wp_filter_nohtml_kses');
add_filter('comment_text_rss', 'wp_filter_nohtml_kses');
add_filter('comment_excerpt', 'wp_filter_nohtml_kses');
