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公开(公告)号：DE69423749T2
公开(公告)日：2000-11-09
申请号：DE69423749
申请日：1994-01-31
Applicant: ABB AB VAESTERAAS
Inventor： PAULSSON LARS , AENGQUIST LENNART
Abstract: PCT No. PCT/SE94/00072 Sec. 371 Date Oct. 24, 1994 Sec. 102(e) Date Oct. 24, 1994 PCT Filed Jan. 31, 1994 PCT Pub. No. WO94/22279 PCT Pub. Date Sep. 29, 1994An arc furnace (1) has an electrode (13) and connection members (14) for connection to a power-supply network (20) for supplying an arc (16) at the electrode with current. The furnace is provided with a voltage-pulse generating member (3) adapted, in connection with an interruption in the arc, to supply voltage pulses to the furnace for striking the arc.
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公开(公告)号：DE69704602D1
公开(公告)日：2001-05-23
申请号：DE69704602
申请日：1997-06-09
Applicant: ABB AB VAESTERAAS
Inventor： HASLER JEAN-PHILIPPE , JOHANSSON THOMAS , AENGQUIST LENNART
Abstract: A device for compensation of the reactive power consumption of an industrial load, preferably an electric arc furnace or a plant for rolling of metallic materials, supplied from a three-phase (a, b, c) electric ac network, comprises a first compensation device for controllable consumption of reactive power and a second compensation device for generation of reactive power. The first compensation device comprises an inductor connected in series with a semiconductor connection controllable in dependence on a control order ( alpha ref) supplied thereto. Control equipment is supplied with measured values of voltage (Ua, Ub, Uc) and current (Ia, Ib, Ic), respectively, at the load. The control equipment comprises devices for determination of the instantaneous consumption of active and reactive power by the load, and a control device which forms the control signal to the first compensation device in dependence on the consumption of reactive power and active power by the load.
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公开(公告)号：DE69704602T2
公开(公告)日：2001-11-22
申请号：DE69704602
申请日：1997-06-09
Applicant: ABB AB VAESTERAAS
Inventor： HASLER JEAN-PHILIPPE , JOHANSSON THOMAS , AENGQUIST LENNART
Abstract: A device for compensation of the reactive power consumption of an industrial load, preferably an electric arc furnace or a plant for rolling of metallic materials, supplied from a three-phase (a, b, c) electric ac network, comprises a first compensation device for controllable consumption of reactive power and a second compensation device for generation of reactive power. The first compensation device comprises an inductor connected in series with a semiconductor connection controllable in dependence on a control order ( alpha ref) supplied thereto. Control equipment is supplied with measured values of voltage (Ua, Ub, Uc) and current (Ia, Ib, Ic), respectively, at the load. The control equipment comprises devices for determination of the instantaneous consumption of active and reactive power by the load, and a control device which forms the control signal to the first compensation device in dependence on the consumption of reactive power and active power by the load.
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公开(公告)号：DE69423749D1
公开(公告)日：2000-05-04
申请号：DE69423749
申请日：1994-01-31
Applicant: ABB AB VAESTERAAS
Inventor： PAULSSON LARS , AENGQUIST LENNART
Abstract: PCT No. PCT/SE94/00072 Sec. 371 Date Oct. 24, 1994 Sec. 102(e) Date Oct. 24, 1994 PCT Filed Jan. 31, 1994 PCT Pub. No. WO94/22279 PCT Pub. Date Sep. 29, 1994An arc furnace (1) has an electrode (13) and connection members (14) for connection to a power-supply network (20) for supplying an arc (16) at the electrode with current. The furnace is provided with a voltage-pulse generating member (3) adapted, in connection with an interruption in the arc, to supply voltage pulses to the furnace for striking the arc.
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