Abstract In a static converter which includes a delay angle control device, a control amplifier for controlling the delay angle control device, and an arrangement for blocking the converter. In order to provide for rapid starting of the converter a limiting member for limiting the delay angle of the converter so as to limit the direct voltage of the converter is controlled by the output signal of the blocking device over a switch delaying circuit. A transient order device is also connected to the input side of the control amplifier to increase the input signal of the amplifier and the transient order device is actuated by the blocking means for the DC transmission line connected to the converter. An under-voltage sensitive device actuated by the voltage in an AC network connected to the converter is connected in parallel to the blocking device, and the two parallel devices are connected to the limiting member and the transient order device by an OR gate.
In a static converter, the converter comprising a delay angle control device, a control amplifier to control the delay angle control device and a device for blocking the converter, means for rapid starting of the converter comprising two members actuated by the signal from said blocking device, the first of said members being a limiting member to limit the delay angle of the converter, corresponding to a limitation of the direct voltage of the converter, a switch-delaying holding circuit, said limiting device being controlled by the output signal of the blocking device over said switch-delaying holding circuit, the second member being a transient-order device connected to the input side of the control amplifier to increase the input signal of the amplifier and including means actuated by the output signal of the blocking device to actuate the transient order device when the blocking signal disappears.
Claim 2
Dependent Claim
144 words
In a static converter, the converter comprising a delay angle control device, a control amplifier to control the delay angle control device and a device for blocking the converter, means for rapid starting of the converter comprising two members actuated by the signal from said blocking device, the first of said members being a limiting member to limit the delay angle of the converter, corresponding to a limitation of the direct voltage of the converter, a switch-delaying holding circuit, said limiting device being controlled by the output signal of the blocking device over said switch-delaying holding circuit, the second member being a transient-order device connected to the input side of the control amplifier to increase the input signal of the amplifier and including means actuated by the output signal of the blocking device to actuate the transient order device when the blocking signal disappears.
Claim 3
Dependent Claim
24 words
In a static converter according to claim 1, said blocking device comprising a line-protection means for a DC transmission line connected to the converter.
Claim 4
Dependent Claim
54 words
In a static converter according to claim 2, an AC network connected to the converter and, in parallel with said line-protection means, an under-voltage sensitive device which is actuated by the voltage in said AC network and an OR gate connecting said under-voltage sensitive device and the line protection means to said two members.
Claim 5
Dependent Claim
23 words
In a static converter according to claim 3, said OR gate being provided with a third input for connection to a starting pulse.