Signal generation unit and method for generating a data signal in a control unit of a power system device
A signal generation unit and power system technology, applied in electrical components, control/regulation systems, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as material migration and evaporation of contact components
Inactive Publication Date: 2012-02-15
ABB (SCHWEIZ) AG
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Problems solved by technology
As a result, sparks can be generated between the two contact elements of the contact, which can lead to migration of substances between the contact elements and evaporation caused by high temperatures
The negative effect of an inductive load on the relay contacts is more destructive in a DC circuit than in an AC circuit
Method used
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[0028] in figure 1 The conventional drive unit 1 shown in is intended for use with a tap changer. It includes: an electric motor 2 as a main component to drive the output drive shaft 4 via a gear unit 5; and a control unit 3 to monitor and control the operation of the motor 2 and thereby monitor and control the operation of the tap changer . in figure 1 The actual tap changer not shown in will be mechanically connected to the output drive shaft 4.
[0029] The control unit 3 receives control instructions from the advanced control system and sensor signals from the motor 2. The control commands and sensor signals are then processed by the control unit 3 to generate output signals. A small part of the output signal controls the voltage supply to the motor 2 so that the output drive shaft 4 rotates to a desired angle, and the tap changer moves to the desired position accordingly. These output signals are internal signals. The other main part of the output signal is used as measu...
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A signal generation unit and a method are provided for generating data signals in a control unit of a power system installation, wherein the control unit is in particular a tap changer drive unit. The signal generation unit includes: a signal relay (6) for alternately opening and closing at least one relay contact, thereby performing a switching operation between two different output voltages; and a protection circuit connected with the at least one relay contact Contacts are connected in parallel for protecting the at least one relay contact against overvoltage. The at least one relay contact corresponds to two relay output terminals (8). In order to allow the signal generating unit to be used for different AC or DC output voltages and to be able to withstand up to the maximum rated inductive load, the protection circuit comprises: a rectifier unit (12) connected in parallel to said two relay output terminals (8); a transistor switch (10), connected in parallel with the DC output of the rectifier unit (12), so that when the transistor switch is closed by the switch control unit, the DC output of the rectifier unit is short-circuited; and the switch control unit (11 ) for closing the transistor switch (10) before opening the at least one relay contact, and opening the transistor switch (10) after opening the at least one relay contact.
Description
Technical field [0001] The present invention relates to a signal generating unit and method for generating data signals in a control unit of power system equipment. In particular, the control unit is a tap-changer drive unit. Background technique [0002] Generally speaking, relays are widely known in the prior art. They are usually used to connect a load to a power source. For example, US 4,466,038 and US 6,621,668 B1 describe mechanical relays that apply AC power to the load, respectively. In order to suppress the arc discharge that occurs during the opening and closing of the relay contacts, a solid-state switch is connected in parallel with the relay. Before opening or closing the relay contacts, respectively, the solid state switch is closed; and after opening or closing the relay contacts, the solid state switch is opened. In contrast to relays that work as power switches, the present invention relates to signal relays. [0003] In the current high-voltage and medium-volta...
Claims
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IPC IPC(8): H01H9/54H02H7/055H02H9/04G05F1/147
CPCH01H9/542H01H9/0027G05F1/14
Inventor L·科诺维P·埃里克森
Owner ABB (SCHWEIZ) AG