JPS6338715Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thyristor valve device in which a DC high voltage circuit is opened and closed using a large number of thyristors.

Recently, thyristor valves are used to open and close DC high-voltage power supplies by connecting a large number of thyristors (100 to several 100 pieces) in series to obtain the required high DC withstand voltage. is often used. If the gates of a large number of these thyristors are not fired at the same time, the thyristors that have delayed firing will suffer dielectric breakdown due to overvoltage, so a gate transformer formed in a so-called through CT type is generally used. This gate transformer consists of a large number of annular cores wrapped with secondary coils and one turn of the primary coil passed through them, which are sealed in the same tank together with an insulating medium such as insulating oil or SF ₆ gas. There is a device that is configured so that an ignition pulse is applied to the coil from an external pulse generator, but since there are a large number of annular cores (100 to several 100), the ignition device becomes large, and thyristor valve devices using this are also used. There is a problem of inevitably increasing the size. In order to improve this, there is a method in which multiple secondary coils are wound around a ring-shaped core to form a gate transformer, but this results in variations in the output from each secondary coil and a delay in ignition. The problem is that it is easy to occur. In addition, a large number of thyristors are divided into a plurality of blocks, and the gate of each thyristor of the block is connected from a second gate transformer in which a primary coil of one turn is connected to the secondary side of a first gate transformer that outputs an output for each block. Although some devices are configured to output at the same time, there is a problem in that the output tends to vary between blocks and simultaneous firing cannot be fully expected. Furthermore, when a thyristor valve incorporates a large number of thyristors and their protection circuits, the thyristors are divided into multiple blocks and stacked in stacks to ensure insulation strength against high DC voltages. ,
If a failure occurs due to an external surge, each block must be removed and inspected.
In particular, when removing the lower stacked blocks, it is necessary to remove all the upper blocks, which poses a maintenance problem in that inspection and repair are time-consuming and complicated.

The present invention has been developed in view of the above-mentioned points, and its purpose is to provide a gate transformer that can be constructed in a small and compact size by preventing variations in the output of the gate transformer, and that can be easily inspected and maintained. It is about providing.

In order to achieve the above object, the present invention consists of unitizing thyristors, housing a plurality of them in a horizontally elongated box, and arranging through-hole CT type gate transformers of the same number as the units in the box in a horizontal manner. It is constructed by making it modular and stacking it up and down.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a thyristor unit in which a thyristor and its protection circuit are mounted on a substrate. As shown in the circuit diagram in Figure 1, this is done by connecting the gate of thyristor Th ₁ to input terminal G ₁ via diode D ₁ for blocking reverse current.
In addition, the cathodes are connected to the input terminal L ₁ , and a resistor R ₁ and a capacitor C ₁ are inserted in parallel between the gate and cathode of the thyristor Th ₁ , the anode is connected to the connection terminal A 1, and the cathode is connected to the connection terminal A ₁ . K ₁
A snubber circuit with a resistor R ₂ and a capacitor C ₂ connected in series, a surge absorber Z ₁ , and a display circuit with a resistor R ₃ and a light emitting diode LED ₁ connected in series are connected between the anode and cathode. When the thyristor Th ₁ is not fired with a voltage applied between the connection terminals A ₁ and K ₁ , the light emitting diode of the above display circuit
LED ₁ is now lit. and,
As shown in FIG. 2, the thyristor Th ₁ and its protection circuit and display circuit are mounted on one side of a printed circuit board 2 made of glass epoxy resin, etc. The ends) are attached to the rectangular front plate 3 by screws or the like to a mounting piece _3a , which is formed by bending the short side end of the front plate 3 into an L-shaped cross section, and a handle 4 is attached to the center of the front plate 3. Install the
A terminal block 5 having connection terminals A ₁ and K ₁ is attached to the lower part in the longitudinal direction, the light emitting diode LED ₁ is attached to the upper part in the longitudinal direction, and mounting holes 3 _b are bored at the upper and lower ends in the longitudinal direction. is. Input terminals G ₁ and L ₁ are attached to the rear end (left end in the figure) of the board 2 via support fittings 27 . This is arranged so that its connecting portion formed by a so-called plug-in male connector projects rearward from the rear end of the board 2. Reference numeral 6 denotes a thyristor module which accommodates and arranges the thyristor unit 1 and a plurality of through-hole CT type gate transformers, which will be explained with reference to FIGS. 3 and 4.
7 is a box made of board material in the shape of an oblong box, with front and rear sides,
The top and bottom, left and right sides are each opened in the shape of a window. Regarding the front and rear surfaces and both left and right sides, the upper surface shown in Figure 3 A is referred to as the rear surface, the lower surface is the front surface, the left and right sides are referred to as the left and right sides, and the upper and lower surfaces shown in Figure 3 B are referred to as the upper and lower surfaces. . A plurality of guide rails 9 are arranged in the front and back of the box 7, extending in the front-rear direction and slidably holding the upper and lower edges of the board 2 on a horizontally suspended support stand 8. However, the substrates 2 of the thyristor units 1, 1, . . . (eight in this example) are housed in this so that they can be inserted and removed. A terminal board 10 made of an insulating material is erected at the rear of the guide rails 9, 9, . . . via a support fitting 11,
The female connectors G ₂ , L ₂ are attached to this so as to face the input terminals G ₁ , L ₁ consisting of male connectors attached to the rear end of the board 2 of the thyristor units 1, 1 . By inserting the board 2 along the guide rail 9, the input terminals G ₁ and L ₁ of the male connector are connected to the female connector G ₂ ,
It is inserted into L ₂ , making it a so-called plug-in connection. Also, in the rear part of the box 7, the number of thyristor units accommodated is the same as that of the thyristor units 1 (8 in this example).
) gate transformers 12, 12, . . . are arranged side by side. This gate transformer 12 is made by winding a secondary coil around an annular iron core and molding it by resin molding to form a through CT type.A rod-shaped conductive material is integrally molded concentrically with an insulating resin such as polyurethane resin. The primary conductor _12a is passed through and its axial ends project laterally from both left and right side surfaces of the box 7, and a cross-sectional circle is formed on the projecting end surface around the circumference of a disc made of a conductive material such as aluminum material. A shield plate 13 with a shaped ring attached thereto is attached. Reference numeral 14 denotes a side plate cover which is attached to the box 7 by screws so as to cover both the left and right sides of the box 7, and is made of plate material and has a dish-like shape, and its corners are rounded into an arc shape. The primary conductor _12a is formed at the upper and lower ends of the box 7 through a bush 15 made of an insulating material with a relatively high dielectric constant such as a phenolic resin material. A box 7 and a hollow are formed on the seat _7a and attached with screws or the like, so that heat inside the box 7 can be dissipated smoothly. Reference numeral 16 denotes a mounting base made of insulating material attached to the upper and lower front surfaces of the case 7, to which the front plate 3 of the thyristor unit 1 can be removably mounted with screws 17 through the mounting holes _3b . ing. Reference numerals 18, 19, and 20 denote upper and lower covers and rear covers made of wire mesh, punched plates, etc., which cover the openings on the upper, lower, and rear surfaces of the case 7 and are attached using screws or the like. Reference numeral 21 denotes mounting fittings attached to the upper and lower surfaces of the case 7 by screws or the like at the left and right ends, and bolt holes 21 _a for attaching the insulators 22 are bored therein. The insulator 22 has a cylindrical shape made of epoxy resin or the like and is molded with embedded metal fittings provided with screw holes in its upper and lower end surfaces.

Thyristor module 6 configured in this way
A thyristor valve device is formed by stacking a plurality of layers vertically via insulators 22. This will be explained with reference to FIG. 23 is an insulating stand provided at the bottom of the cabinet (not shown). 24 is insulation stand 2
3. A shield plate attached to the top with screws etc.
It is formed by attaching round rods etc. around the periphery of a rectangular plate. And the above shield plate 2
4, the thyristor module 6 located in the lower stage
, the insulators 22 are fastened to the upper and lower mounting brackets 21 through the bolt holes 21 _a to the screw holes of the embedded brackets, and the insulators 22 on the lower surface of the box 7 are attached with bolts, and then the following steps are taken: The insulator 22 is attached to the mounting bracket 21 on the upper surface of the thyristor module 6 located in the step, and the mounting bracket 21 on the lower surface is attached to the thyristor module 6.
The insulator 22 attached to the mounting bracket 21 on the top surface of the thyristor module 6 located in the lower stage is attached with bolts in the same manner as described above, and thereafter the thyristor module 6 is sequentially attached to the upper side via the insulator 22. They are stacked and installed in multiple stages (seven stages in this example). At this time, the thyristor modules 6, 6, etc. stacked in multiple stages are assembled so that the front surfaces of the boxes 7 thereof are flush with each other. Moreover, in order to facilitate series connection of the primary conductors 12 protruding from the left and right sides of the plurality of thyristor modules 6, 6...,
Thyristor modules 6, 6, which are half the number of thyristor modules forming the thyristor valve device.
, the secondary coil of the gate transformer 12 and the female connectors G ₂ and L ₂ attached to the terminal board 10 are connected so that the polarity is reversed, and the polarity is not reversed with the thyristor module 6 whose polarity is reversed. Insulator 22 alternately with thyristor module 6
Place and assemble by stacking them. A shield plate 25 formed in the same manner as the shield plate 24 is mounted on the upper thyristor module 6 via an insulator 22. Half of the total number of stacked thyristor modules 6 (14 in this example) are assembled by stacking the boxes 7 with their rear surfaces facing each other (so-called back-to-back), as shown in FIG. 5B. By stacking the thyristor modules 6 in this way, the thyristor modules 6, 6
The primary conductors _12a of the gate transformers 12 are connected to each other through connection leads 26, as shown in FIG.
The connecting leads 26 between the back-to-back thyristor modules 6, 6 are curved in an arc shape and brought close to each other, and connected in series. This reduces the inductance caused by the connection lead 26 and makes the connection, and both ends of the connection lead 26 are connected to the connection terminals K and L, respectively, as shown in FIG.

Next, the series connection of the thyristors Th ₁ , Th ₁ . . . of the thyristor units ₁ , _{1 .} are connected in series in the same direction, and the connection terminals A ₁ and K ₁ of each thyristor module 6 connected in series are connected to the series connection of the upper thyristor module 6 as shown in FIG. Connect the connected terminal A ₁ to the power supply side connecting terminal A, and connect K ₁ to the connecting terminal A ₁ of the thyristor module 6 facing back to back, and connect the connecting terminal K ₁ to the next stage thyristor module 6 in the same row.
The connection terminals _K1 of the lower thyristor modules ₆ connected in series are connected to the output side connection terminals K in the same way. The output side connection terminal K is connected to a load (not shown), and the power supply side connection terminal A is connected to a DC high voltage source (not shown). Further, a pulse generator (not shown) is connected to the connection terminals K and L.

In this way, the gate transformer 12 is modularized for multiple units, but its primary side (primary conductor 12 _a ) is connected in series, so the output from the pulse generator (not shown) is connected to the primary conductor. _12a , the output from the secondary coil of the gate transformer 12 is distributed between each thyristor without causing variations in output between units and between modules.
It is sent to the gates Th ₁ , Th _{1 . .} . and simultaneously fires a large number of thyristors. Moreover, since the primary conductors _12a are connected to each other in such a way as to reduce the inductance, the rise becomes steep, and the reliability of simultaneous firing can be improved. Further, since the connection between the primary conductors _12a of the gate transformer 12 and the connections between the thyristors _Th1 , _Th1 , .

Next, regarding maintenance and inspection, when a voltage is applied between the power supply side and output side connection terminals A, K shown in Fig. 6 and the thyristors _Th1 , _Th1 ... are not fired, the light emitting diodes _LED1 of the thyristor units 1, 1 ... are all lit, and when the thyristors _Th1 , _Th1 ... are fired simultaneously, all the light emitting diodes _LED1 are turned off. Therefore, if there is a light emitting diode _LED1 that is turned off even though the thyristors _Th1 , _Th1 are not fired (when a voltage is applied between the connection terminals A, K),
In this thyristor unit 1, a short circuit fault occurs between the connection terminals _A1 and _K1 of the thyristor _Th1 .
Disconnect _A1 and _K1 , remove screw 17 and remove handle 4.
The unit 1 is pulled out forward through the
The input terminals G1, _L1 are detached from the female connectors _G2 , _L2 only. Then, the thyristor _Th1 and the protection circuit of the unit are inspected, and if any are broken, the parts are replaced. The board 2 of the unit is inserted along the guide rails 9, and the input terminals _{G1 , L1} are plugged into the female connectors _G2 , _L2. Then, the screws 17 are tightened.
The front panel 3 is fastened by the above, and the connection terminals of the terminal block 5 are
The check is completed by connecting _A1 and _K1 .

According to the present invention, the thyristor module has a plurality of thyristor units arranged in the front part of a box framed in the shape of an oblong box, and the same number of through-hole CT type gate transformers as the units arranged in the rear part, in a side-by-side manner. The primary conductor of the gate transformer is integrally molded into a rod-shaped body, with both ends protruding on both the left and right sides of the box. The connection polarity of the secondary side of the gate transformer is reversed and the remaining half of the gate transformers are alternately arranged, and the above primary conductors are connected in series on the left and right sides of the box, so that the connection polarity between the primary conductors is Connections can be made to reduce inductance, allowing the gates of multiple thyristors to output steeply rising pulses without causing variations, and multiple thyristors to be activated at the same time. Moreover, the connection between the primary conductors and the connection between the thyristors can be performed separately, and the thyristors can be simultaneously activated without causing false activation due to noise.

This is a great advantage for thyristor valves that use a large number of thyristors to open and close DC high-voltage power supplies.

The thyristor modules are stacked as follows:
If half of the total number of stacked layers are placed back-to-back and the connecting lead wires between the primary conductors are curved in an arc shape and placed close to each other, the inductance can be reduced more effectively, further improving the reliability of simultaneous arcing.

In addition, a shield plate made of a circular plate made of a conductive material and having a circular cross section is attached to the protruding end face of the primary conductor of the gate transformer, and the shield plate is passed through the primary conductor to cover both left and right sides of the box. The side plate cover to be attached is formed into a dish shape with arcuate corners, and the side plate cover and shield plate are designed to alleviate the concentration of electric field, so corona discharge can be prevented with a simple configuration. It can be prevented.

Furthermore, a large number of thyristors and their protection circuits are each made into a unit, placed side by side at the front of the thyristor module box, and connected to the output end of the gate transformer by plug-in, so that each unit can be inserted and removed. Inspection and parts replacement when a failure occurs can be carried out by pulling out each unit, which greatly reduces the effort required for inspection and further improves the labor savings in maintenance management. Moreover, since the number of gate transformers is the same as the number of units, they are arranged side by side and stacked one above the other, so they can be compactly housed in a modular box without increasing the size, and the distance between the thyristor modules can be reduced. Since connections can be easily made externally, the device can be constructed with reduced assembly man-hours.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a thyristor unit showing an embodiment of the present invention, Fig. 2 is an outline drawing of Fig. 1, and Fig. 3 is an embodiment of a thyristor module accommodating a plurality of the thyristor modules shown in Fig. 2. In the external drawings shown, A is a partially cutaway plan view, and B is a front view. 4 is a cross-sectional side view taken along the line X-X in FIG. 3A, and FIG. 5 is an external view of a thyristor valve device showing an embodiment of the present invention, and FIG. B is its side view. FIG. 6 is an explanatory diagram of the connections shown in FIG. 5. DESCRIPTION OF SYMBOLS 1... Thyristor unit, 2... Printed circuit board, 3... Front plate, 6... Thyristor module, 7... Box, 9... Guide rail, 10...
Terminal board, 12... Gate transformer, 12 _a ...1
Secondary conductor, 13... Shield plate, 14... Side plate cover, 22... Insulator, Th ₁ ... Thyristor.

Claims (1)

[Scope of utility model registration request] A plurality of thyristor units each having a thyristor and its protection circuit mounted on a board are arranged side by side in the front part of a case framed in an oblong box shape so that they can be inserted and removed back and forth via guide rails provided above and below the front part, Inside the rear case of the plurality of thyristor units arranged in parallel, there are the same number of penetrations as the number of units through the terminal plate.
CT type gate transformers are arranged side by side, and the secondary side of the gate transformer and the thyristor unit are removably plug-in connected via the connector attached to the terminal board, and the A plate-shaped side plate cover with arc-shaped corners is attached to the plate, and the primary conductors of the plurality of gate transformers are integrally molded by concentrically molding insulating resin onto a rod-shaped conductive material. Both ends of the primary conductor in the axial direction penetrate the side plate cover and protrude laterally,
A thyristor module is formed by attaching a shield plate made of a conductive material with a disk circumference having a circular cross section to this protruding end surface. At the same time, half of the number of stacks are stacked alternately with the connection polarity between the secondary side of the gate transformer and the connector of the terminal board reversed, and those that are not reversed. A thyristor valve device comprising the primary conductor of the gate transformer connected in series on the side of a box.