That would be Spellbinder.
A group of teenagers go on a school camp in the Blue Mountains in
Australia. While at the camp, Paul Reynolds accidentally goes into a
parallel universe. This other world is inhabited by a more hierarchic
and technologically different society, ruled by a group of people
known as Spellbinders. Paul meets a girl there named Riana, and they
The Spellbinders have discovered the power to create and manipulate
static electricity. They fly in gigantic copper-coloured machines that
utilise large rotating orange crystals, presumably creating some form
of magnetic levitation. The Spellbinders often use their power for
good, but some abuse this power and use their discoveries for
malevolence. One such malevolent Spellbinder is Ashka, who often
manages to hide her true nature. Common people are often "banished"
for their misdeeds, and sometimes Spellbinders are banished, also, if
they are proven to have done wrong.
There is tension from Paul's forays into the land of the Spellbinders
and his attempts to return to his own universe, and also from
conversations Paul has with his friends across the barrier between the
two universes. Paul and Riana's escapes also add tension, as do the
interactions between Spellbinders.
Paul is eventually able to travel back home, but he is forced to take
Riana with him in order to save her. Later, when Paul is able to take
Riana back home, the Spellbinder Ashka follows Paul as he later
returns home. Ashka seeks the unwitting help of Paul's father in
making her a new high-tech 'flying suit' to replace her power suit in
order to make her more powerful than the other Spellbinders.
However, Paul manages to expose her scheme and defeat Ashka, who is
returned as an outcast to the Spellbinder world, while Riana becomes
the new apprentice to Correon. In order to keep the Spellbinder world
safe from the more advanced people from "modern" world, the gateway
between the two universes is closed permanently.