Stepping thyristor switch

FIELD: continuous switching of tap-changing-under-load transformers.

SUBSTANCE: proposed stepping thyristor switch has mechanical stepping selector and load switch. Stepping selector only is disposed in transformer oil tank while load switch incorporating thyristors is mounted in separate case attached to one side wherein it is held in air medium, so that switch thyristors are disposed away from hot transformer oil.

EFFECT: enhanced reliability and service life of switch.

1 cl

 

The invention relates to a thyristor speed switch for continuous switching between different winding taps step transformer under load, consisting of a manual speed selector for produced without the cost of power pre-selection of the corresponding tap of the winding, which should be made the switch, and power switch with thyristors as switching means for the continuous switching from the original on pre-selected new tap winding under load.

Thyristor speed switches of the above type are usually called hybrid manual switches, as they along with the thyristors in the power switch have as an electronic switching means of mechanical contacts, in particular, mechanical selective contacts. It should be mentioned that along with the above, also known so-called walterstone switches disclosed, for example, from WO 95/27931, which has no moving mechanical switching elements and which are large in size and complex structure, and accordingly, no demand and not otherwise relevant to the object of the present invention.

The present invention relates to the greatest is largely to thyristor speed switches of the above type, that is, the hybrid speed switches.

Thyristor speed switches of this type can be divided into two different kinds of device with different principles of operation.

From DE 3223892 C2-known thyristor speed switch of this type, operating on the principle of commutation. When the load switching is performed by the managed switching load current connected in opposite parallel pairs of thyristors in the branch circuit breaker to the other pair of thyristors in another branch. Speed switches of this type were produced and were used in the 80 years in some cases as switches through-type. While the active part of the circuit-breaker is installed on the supporting insulator above the transformer tank filled with air body, and another part of the switch submerged in oil-filled transformer tank. Transformer tank partially filled with insulating oil and is connected to outside air through a collection of silica gel. Inside the active part is the frame, on which the electronic components of the load switch. Himself the reference insulator mounted on a standard flange; in a closed protective cover flange in the upper part of the oil chamber of the load switch is the supporting structure with the connecting contact the AMI. But this switch takes a lot of space, especially due to the large bore hole of porcelain between the housing of the electronic equipment on the transformer and immersed in the transformer part of the device with the bearing structure and mechanical auxiliary switches. In addition, the difficult access to the individual components in oil-filled plot, which complicates maintenance. In General, the switch is considered a type hitherto failed to find a market.

From WO 98/48432 known thyristor speed switch with intermediate resistance. It provides one single connected in opposite parallel pair of thyristors in parallel which included intermediate resistance. Special mechanical switching contacts can be actuated as a pair of thyristors, and intermediate resistance in a certain sequence and included in the circuit. Through intermediate resistance at the load switching transient passes the load current and then the current path, which is called a stepped voltage regulating winding. The design is based on this scheme thyristor speed switch known in the original edition of "OLTC Hybrid-Diverter Switch with Thyristors" by ELIN OLTC GMBH, AT, and TA is the same from the article "Hybrid-Transformatorstufenschalter TADS - ein zukunftweisendes Konzept zur Verlängerung der Wartungsinterwalle" log "e & i, Heft 11, 1999. When this switch is designed as a fully immersed in the oil-filled transformer tank insert. The disadvantage of the switch on this option run is that the thyristors can be affected by hot transformer oil, reduce the life of electronic structural elements that work reliably, as a rule, only when the surrounding temperature to about 100°C. an Additional problem is that, intermediate resistance, and in most cases in many existing intermediate resistance, current load converts a significant portion of the energy into heat, which damages the operation of the thyristors. In the described known speed switches this leads to the fact that you can only produce a limited number of switching loads in a certain period of time, due to the intermediate resistance of heat does not exceed the boundary values. For many industrial applications, this factor is undesirable. In this regard, has already proposed to provide additional thermal automatic switch, which when exceeding the ambient temperature of the thyristors neko is showing thresholds blocks the drive on and off thereby hybrid thyristor switch. It seems obvious that such a method could not find wide industrial applications, because it does not remove the problem, but only allows you to eliminate its consequences.

The task of the invention is to provide a thyristor speed switch of the above type, i.e. a hybrid switch which eliminates the above disadvantages, in particular, eliminates the need for time-consuming bushings and systems of support insulators, being compact and maintainable and implement appropriate selection of the sizes of transistors makes it possible to implement any number of feasible each other schemas.

This task is solved proposed thyristor speed switch with characteristics of the first claim. Auxiliary points are the most preferable improved variants of the invention.

The main advantage of the invention lies in the fact that the thyristors easiest way is thermally decoupled from the hot transformer oil and intermediate resistance without use for this purpose with this labor-intensive design or large-scale flow structures. In accordance with another preferred embodiment of the invention through the use of Autonomous the th construction of the intermediate resistance converted them into heat energy can easily dissipated through natural or forced cooling circuit, in particular, air cooled. At the same time eliminates the radiation of heat to other parts of the appliance, heating, and consequently, damage to the thyristors. Due to this thyristor speed switch allows you to create any number of switching loads one after the other, while the ultimate load capacity of the thyristor at a predetermined intermittent operation of the thyristors is not a problem.

Below is a detailed description of a variant embodiment of the invention. The drawing shows a thyristor speed switch in the embodiment, with intermediate resistance.

The shaded area on the left of the drawing shows an oil-filled transformer tank 1. It is schematically indicated windings 2, 3 and right speed control winding 3 with separate taps 1...n windings. Each of these taps 1...n of the winding is electrically connected with the solid contact K1...Kn speed selector 4 thyristor speed switch. Solid contacts K1...Kn in a known manner includes two movable selective contacts 5, 6. Outside the tank 1 of the transformer to one side of it and above the plate 7 of the passage is installed in a separate housing 8 connected therewith power switch 9 operating in an air environment. Electrical connecting wires 10, 11 from the speed and the of katela 4 to the power switch, as well as the discharge of the load 12 is conducted through a separate maslonapolnennye bushings 13, 14, 15 in the plate 7 of the bushings. Power switch 9 depending on the adopted based scheme may consist of different blocks. In the example shown, the circuit known from WO 98/48432. Thus D1 and D2 denote the contact duration of inclusion, which in a stationary mode transmit current long-term load, that is, create the appropriate connection from one of the movable selective contact 5 or 6 to the drain of the load L. SR means shunting the switch to retract the load L. the Position 16 shows a single, connected in opposite parallel pair transistors, and CT and CR denote the two switches. This radical switch contact ST is electrically connected to the pair of thyristors 16, a radical switch contact CR - with intermediate resistance 17.

According to the best embodiment of the invention from the side in a separate building 8, separated by a dividing wall 18, there is another separate part 19 of the housing, in which, also in the air, the intermediate resistance 17. The top and bottom in the part 19 of the body are provided holes 20, 21 so that a separate air flow for cooling the intermediate resistance 17 may be conducted through de the al 19 of the housing.

In General, the drawing illustrates the most simple design in accordance with the invention. Step seeker thyristor 4 step switch is in the filled oil tank 1 transformer and washed transformer oil. It results in the lubrication of mechanical contacts and sufficient dielectric strength of the entire system. The actual load switching using 16 pairs of thyristors is outside of the transformer tank 1 in an air environment. Thereby eliminating the negative impact of hot transformer oil for a couple 16 of the thyristors. The electrical connection between the two blocks is simple and consists of three electric wires 10, 11, 12 passing through the guide plate 7. As noted above, the main advantage of the claimed design is that intermediate resistance 17 in the following individual parts 19 of the body is placed in the air. Thereby the cooling tiristorov and eliminates any thermal effect on a couple of 16 thyristors.

The invention is not limited to the example implementation of the well-known scheme with a pair of thyristors, with one intermediate resistance and special circuitry additional mechanical switch. In the framework of the invention is applicable is also any other load switch with any system of one or more pairs of thyristors as switching means and regardless of the number, wiring diagrams and sequence of actuation available other mechanical switches. In the invention may be used various ways to get the ignition voltage for the individual thyristors.

1. Thyristor speed switch for continuous switching of the winding taps step transformer under load, containing mechanical speed seeker to produce no cost power pre-selection of the corresponding tap of the winding, which should be made the switch, and power switch of the load, at least one pair of thyristors, connected in opposite parallel to the continuous switching from the original on pre-selected new tap winding under load, characterized in that the speed selector (4) is filled with transformer oil tank (1) step transformer, and power load switch, at least one included counter-parallel pair (16) thyristors mounted in the air in a separate housing (8)placed on the side of the tank (1) transformer and separated from it by a plate (7) of the bushings, and the connecting wires (10, 11, 12) from the speed selector (4) to the power switch (9) is drawn through the plate (7) of the bushings./p>

2. Thyristor speed switch according to claim 1, characterized in that at least one intermediate resistance (17) power switch (9) load placed in the following individual parts (19) of the housing, which on its part is separated from the housing (8) by a dividing wall (18).

3. Thyristor speed switch according to claim 2, characterized in that the part (19) of the housing has at least one opening (20, 21) for air circulation.

4. Thyristor speed switch on PS, characterized in that the air circulation is provided, at least some fans.



 

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FIELD: continuous switching of tap-changing-under-load transformers.

SUBSTANCE: proposed stepping thyristor switch has mechanical stepping selector and load switch. Stepping selector only is disposed in transformer oil tank while load switch incorporating thyristors is mounted in separate case attached to one side wherein it is held in air medium, so that switch thyristors are disposed away from hot transformer oil.

EFFECT: enhanced reliability and service life of switch.

1 cl

FIELD: electric engineering, possible use in construction of devices for switching between branches of windings belonging to force transformers under load.

SUBSTANCE: three-phased device for switching between branches of windings belonging to transformer under load has body made of dielectric with bottom and lid, contactor, including three-phased contactor mechanisms with commutating and additional contacts, forming groups, in its body, resistors, through which additional contacts are connected to linear outputs of adjusting winding of transformer, mechanism for switching between contactors and immovable contacts positioned on the walls of body for connection to transformer and to selectors of phase branches of transformer windings, while immovable contacts of phase selectors can be connected to phase branches of adjusting winding of transformer. Mechanisms of three-phased contactors are mounted in the same body, and their contact groups are shifted relatively to each other in phase-wise manner along body axis by means of mounting of contact groups of one or two phases on dielectric substrates.

EFFECT: simplified construction, increased operational reliability of three-phased device for switching between branches of windings belonging to transformer under load.

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FIELD: electrical engineering.

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EFFECT: simplified design, reduced size, enhanced switch-over time of proposed energy storage contacts.

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EFFECT: optimization of voltage control parameters and improvement of mass and dimensional factors of transformer.

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