JPS5816029B2 - Thyristor Seiri Yuki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sirisk rectifier for high voltage static converters.

The thyrisk rectifier has a plurality of thyrisks connected in series, and each thyrisk is provided with a control device controlled by a control circuit of the entire rectifier, and the control circuit controls the entire static converter and controls its rectification operation. affected by the control system that controls it.

The control device is provided with a signal generator which generates an indication pulse when the voltage in the conduction direction applied to the appropriate sirisk reaches a certain value, unless the sirisk and its control device are defective or defective.

Such a silis rectifier is described, for example, in U.S. Pat.
No. 794908, the object of the present invention is to
With the aid of said indication pulses, it is to record which sirisks and how many of their control devices are good or bad, ensuring constant monitoring of the condition of the rectifier.

Means for this purpose are known, and generally they are based on glow lamps connected across the cyrisk, or on fairly primitive circuits ingenious for transmission between different voltage levels or for long distance transmission. It is something that

On the contrary, the present invention uses a selector that senses the instruction pulse with a storage element and sends it to a counter by a transmission device, the counter and selector being synchronized with each other by a control system connected together. This is what has been done.

The device according to the invention is constructed as described in the claims.

Compared to known devices, the present invention obtains detailed information about the status of the cyrisks and their control devices in a clear manner suitable for operation in unmanned conversion stations.

At the same time, the configuration of this device is simple.

In particular, for rectifiers, from high potential to ground potential 2
only one transmission channel is required.

Furthermore, some components already existing in the device rl sirisk circuit according to the invention can be utilized.

In other respects, the present invention will be described in further detail with reference to the accompanying drawings.

The present thyrisk rectifier consists of several thyrisks 13 to 1n connected in series, and the rectifier is included in a high-voltage stationary converter, forming a rectifier bridge with several similar rectifiers within the converter. .

One end of each rectifier is connected to the DC side of the rectifier bridge,
The other end is connected to the AC side of the bridge.

The control electrodes of each Cyrisk may be used, for example, in the aforementioned U.S. Pat.
As in No. 794,908, it is connected to a control device 1 with a detector in the form of a photodiode 11, which is influenced by a light pulse from a control circuit 22 for the entire rectifier.

This control circuit 22 is influenced by a control system of a stationary converter (not shown), which controls the photodiode 23 and the light guide 2.
4 to the control device 1 to ignite the cyrisk.

Each control device 1 is equipped with a signal generator in the form of a photodiode 12 which generates an indication pulse when the conduction voltage applied to the associated sirisk reaches a certain value.

The control device 1 receives a supply voltage derived from the anode-cathode voltage of the SIRISK and generates an indication pulse unless it is defective.

A defective cyrisk acts as a short circuit, with the 1
Since the voltage is almost zero, the control device of the defective cyrisk receives no voltage and therefore does not generate an indication pulse.

These indicator pulses are sent to a detector 2 via a light guide 2.

This detector consists of a photodiode and forms the input circuit of the storage circuit 3.

In the memory circuit the instruction pulses are stored during each period of operation of the non-device.

During each operating period the instruction pulses arrive at the memory circuit 3 quite randomly.

The memory circuit 3 comprises, for example, a bistable flip-flop provided for each detector and set to 1 by a signal from the detector 2.

The signal stored in the storage circuit 3 is sensed by the selector 4.

The selector 4 searches the memory circuit by stepping its input from one memory element (flip-flop) to the next at a constant speed in a predetermined order according to a series of signals received from the controller 5.

When the above series of signals is applied to the selector 4, the control device 5 generates a reset signal to stop sending signals to the selector 4, and sends the signal to the memory circuit 3 so that a new series of instruction pulses can be accumulated and recorded. Clear.

A pulse train controlled by the control device 5 is sent out from the selector 4, in which each different pulse and all pulse intervals caused by missing pulses correspond to the state of each of the sirisks 13 to 1n.

These pulses are sent to the counter 7 by the transmission device 6a.

A control device 9 is provided which is connected to the control device 5 of the selector 4 by a further transmission device 6b for synchronizing the counter 7.

In this way, the counter 7 records the pulse interval caused by a pulse or a missing pulse coming from the selector 4.

The counter 7 contains a signal corresponding to the total number of sirisks before the selector 4 senses the pulse and also has the characteristic of a down counter.

The signal corresponding to the total number of said risks is then subtracted by the pulses coming from the selector 4.

After scanning, the counter contains the number of defective cyrisks.

The result of the counter 7 can be used to record by means of a special indicator 20, for example in the form of a so-called numeric display tube, which displays the number of defective cyrisks.

Generates a warning signal when the number of defective Cyrisks reaches a certain number,
so that if the number approaches a dangerous number with respect to the strength of the psi-risk in question, an alarm or release signal will be emitted.
It is advantageously possible to obtain a multi-stage alarm or release device.

A storage device 8 for recording the position of the defective cyrisk is arranged in parallel with the counter 7 and is likewise controlled by a control device 9.

If the contents of a particular memory element of the memory circuit 3 indicate that no instruction pulse has been received, the memory device 8 records this fact and identifies the corresponding risk.

The output circuit 21 of the storage device may be in the form of a diagram with electric lights or signal flags.

The output circuit 21 is also designed, for example, as a recorder that periodically records the defective and damaged cycles in the rectifier.

The operation of counting the number of defective risks described above is summarized as follows.

The control device 5 is, for example, capable of detecting the end of each conduction period of the Sirisk rectifier and at this time sends a synchronization signal to the slave control device 9 and also resets the storage circuit 3 and the selector 4, thus The selector 4 starts scanning the contents of the memory circuit 3.

That is, the selector 4 rapidly outputs the memory elements corresponding to the respective si-risks in the memory circuit 3 one after another, and outputs the successive output results as a pulse train.

If the rectifier consists of 5 sirisks and the third sirisk is faulty, then the pulse train is [11
It becomes 0111.

This pulse train is sent to a counter 7 and a storage device 8 via a transmission device 6a;
is reset when the control device 9 receives a synchronization signal from the storage device 5.

Counter 7 counts the number of 01s from the received pulse train.

When the entire pulse train has been received and the number of "0"s has been counted, the contents of the counter 7 indicate the number of defective SI risks.

The memory device 8, like the memory device 3, has a memory element corresponding to each signal, and in this case, there are five elements, and each digit of the pulse train is stored.

When the entire pulse train has been received, the contents of each element of the storage device 8 will be ml, 1, 0, 1 . jJ, and the first and second
゜4.5 This indicates that the cyrisk is operating or the third cyrisk is malfunctioning.

Since the counter 7 and the memory circuit 8 are arranged in parallel, they can operate at their respective speeds, so that the circuit 20 always provides an up-to-date numerical display;
On the other hand, the circuit 21 is activated at an appropriate time, with a certain delay, e.g.
When the number of corrupted Sairisks increases, displays the distribution of total Sairisks and corrupted Sairisks.

Among the components shown in the figure, 2 to 5 may be suitably kept at the rectifier potential, ie the same potential as the cyrisks 13 to 10 and the control device 1.

Components 2 to 5 are therefore mounted on the rectifier chassis.

Furthermore, the other easily accessible components are kept at ground voltage, and the transmission devices 6a and 6b are suitably constructed as light guides for optical signal transmission.

In principle, the output circuits 20 and 21 can be placed anywhere, but in the case of an unmanned converter station they are installed in a main control station remote from the converter station, and the signals from 7 and 8 can be sent by telecommunications. It is suggested.

All components from 2 onwards are arranged as close to ground voltage as possible to simplify the connections between the components.

Components 2 through 5 are according to US Pat. No. 3,842,337.

As mentioned above, the pulses emerging from the detector 2 reach the storage circuit 3 arbitrarily according to the voltage applied to the respective sirisk 13-1n as the voltage increases across the rectifier after the conduction period.

To enable the pulses to be recorded and the state of the sirisk to be controlled, a memory circuit 3 is introduced so that the selector 4 can work at an appropriate speed.

Pulses are recorded after each conduction period of the Sirisk rectifier, but generally with sufficient certainty even if the selector 4 is operating at a somewhat slower speed, for example recording each period of operation of a stationary transducer or at a slower frequency. is obtained.

In this case, for example, the recording circuits 8 and 21 can be common to all rectifiers in the static positive converter.

It is also possible to completely exclude the storage device 3 and allow the selector 4 to directly select the detector 2.

This can be done in such a way that the detector 2 is read after each conduction period of the selector 4 or the Sirisk rectifier, and then proceeding to the next detector.

In this case, a number of readings corresponding to the same number of operating periods as the number of cyrisks in the rectifier would be required.

Even if this number reaches several hundred, the reading speed is completely satisfactory.

Moreover, this number can be reduced by several times if the detector 2 is controlled with an inhibit output signal, thus giving the selector 4 the necessary time to read.

This would cause detector 2 to take over the memory function from 3.

[Brief explanation of the drawing]

The attached figure shows a sirisk rectifier with a monitoring device according to the invention. DESCRIPTION OF SYMBOLS 1... Control device, 2... Detector, 3... Memory circuit, 4... Selector, 5... Control device, 6... Transmission device, 7... Counter, 8...・Recording storage device, 12・
...Signal generator, 13...Sirisk, 22...Control circuit.

Claims (1)

[Scope of Claims] 1. A thyristor rectifier for a high-voltage static converter including a plurality of thyristors 13-1n connected in series, each thyristor having a control device 1 connected between its anode, cathode and gate electrode. The control device 1 receives the ignition pulse from the control circuit 22 for the entire rectifier, supplies a gate current to the cyrisk, detects the voltage in the conduction direction of the cyrisk, and when the detected voltage reaches a predetermined value. In a device equipped with a signal generator 12 that generates an instruction pulse to the detector 2, the signal generator 12 receives the instruction pulses from each of the cyrisks irregularly sent from the detector 2 during each operation period of the rectifier, and a selector 4 that sends out pulse trains with different contents via the transmission line 6 in accordance with the operating state of the selector; a counter 7 that receives the pulse train from the selector 4 and counts the number of defective thyristors from this pulse train; A silice rectifier, characterized in that it comprises control devices 5 and 9 connected to a selector 4 and a counter 7 to synchronize the operations of the selector 4 and the counter 7.