CN214337561U - Protection circuit of reactive compensation thyristor and thyristor fling-cut switch - Google Patents
Protection circuit of reactive compensation thyristor and thyristor fling-cut switch Download PDFInfo
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- CN214337561U CN214337561U CN202023245375.4U CN202023245375U CN214337561U CN 214337561 U CN214337561 U CN 214337561U CN 202023245375 U CN202023245375 U CN 202023245375U CN 214337561 U CN214337561 U CN 214337561U
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Abstract
The utility model provides a reactive compensation thyristor's protection circuit and thyristor fling-cut switch. A protection circuit for a reactive compensation thyristor, comprising: the overvoltage protection circuit is connected in parallel with two ends of the thyristor; and the resistance-capacitance protection absorption circuit is connected in parallel with two ends of the overvoltage protection circuit. The utility model provides a pair of reactive compensation thyristor's protection circuit to the thyristor module in the benefit thyristor switch altogether (certainly also be applicable to and divide the benefit switch), both can provide peak voltage absorption protection, can play the protection to overvoltage such as surge, crowd's pulse again, and the design is simple, and the practicality is strong, the dependable performance.
Description
Technical Field
The utility model relates to a reactive compensation technical field, more specifically the says so, relates to a reactive compensation thyristor's protection circuit and thyristor fling-cut switch.
Background
Reactive compensation plays an important role in the application of power technology. Because the inductive load is everywhere in our life, the precious power grid capacity is occupied in the transmission process of the power grid power, and the line loss is increased. Therefore, it is necessary to compensate for the inductive reactive power at the user side (e.g., terminal power utilization places such as living districts and factory parks), and the method includes: capacitive reactive power is connected, and a reactive compensation capacitor is generally used for completing the task (of course, a technical scheme without a capacitor exists, which is not mainstream at present and does not belong to the technical scope related to the scheme).
It is known that the moment a capacitor is switched on corresponds to a short circuit, and if no technical measures are taken, a large overcurrent, called "inrush current", will form. Therefore, when a capacitor is generally put into use, a voltage zero-crossing switching technology is usually adopted, namely, the capacitor is connected when the voltages at two ends of the thyristor pass through zero, so that no or little inrush current can be generated, and the circuit can bear the inrush current. The work of connecting the capacitor is usually accomplished by the thyristor (commonly called silicon controlled rectifier), also can be accomplished by the special switching contactor, but the latter usually does not have zero crossing switching ability, though the inrush current is restricted by some technical means, still can produce great inrush current. However, such inrush currents can be controlled within the specification requirements of the device. The protection module discussed in the present application is mainly directed to a switching switch using a Thyristor as a switching device, and is referred to as a TSC (Thyristor Switched Capacitor) in the industry.
The thyristor has the characteristic of controlling strong current by weak current, but the overload resistance of the thyristor is poor, and particularly the overvoltage disturbance resistance. When the power grid contains interferences such as higher harmonics, surge, pulse burst and the like, due to the limitation of dv/dt voltage change rate technical indexes, the thyristor can not be controlled by a gate pole any more to generate false triggering, and overvoltage represented by the surge can also cause permanent damage to the thyristor, so that the case is frequent in practical application, and the normal industrial production and the life of people are seriously influenced.
Generally, the simplest method for protecting the thyristor is to adopt an RC (resistance-capacitance) absorption protection circuit shown in figure 1, and the scheme is simple to use, low in cost, imperfect and effective, and therefore widely applied.
The thyristor switch has the common compensation and the sub-compensation, the former means that the compensation capacitor with three-phase triangle connection is switched simultaneously, and the latter can respectively switch each phase of the star-connected capacitor to meet the compensation requirement of unbalanced working condition. The wiring diagram of the switching switch of the common compensation thyristor is shown in fig. 2, because synchronous compensation is adopted, in order to save cost, normally, the L2 phase is directly connected, and the purpose of disconnecting the three-phase capacitor can be achieved by only cutting off the L1 phase and the L3 phase through the switch, which is different from the point of separate compensation. In order to realize three-phase respective control, three control switches (only one in total compensation) are needed, and three capacitors are connected in a star connection mode through N lines (neutral lines).
The RC resistance-capacitance protection absorption circuit is generally connected in parallel at two ends of the anti-parallel thyristor module. However, the working characteristics of the common-compensation thyristor switch and the sub-compensation thyristor switch are significantly different, that is, when the switching switch is switched off under the control of the control signal, because the anti-parallel thyristor modules are automatically turned off at the zero-crossing point of the current, the phase difference between the current flowing through the L1 and L3 phase thyristor modules is 240 ° (under the positive sequence condition), which results in that the anti-parallel thyristor modules cannot be turned off at the same time, and the line voltage will continue to charge the capacitor in the phase where the thyristor is turned off through the non-turned-off thyristor module and the L2, which results in that the dc voltage at the two ends of the turned-off thyristor module continues to rise (certainly, the voltage may gradually tend to 0V, the direction is random) to reach the Vdc (refer to fig. 4), and the ac voltage superimposed on the common-compensation thyristor switch and the sub-compensation switch, the voltage peak Vmax at the two ends of the turned-off thyristor module can be as high as 1300V or even disappear at the zero-crossing point of the voltage, as shown in fig. 4. Due to the randomness of the cut-off time, the value of Vmax is random and not always such high peak voltages can be achieved. This requires that the withstand voltage of the RC absorption protection circuit must be at least as high as this value to be usable. It should be noted that the sub-compensation switch is independently controlled by three phases and has N lines, so the capacitor cutting "charging" phenomenon does not occur, and thus, the requirement for the RC protection absorption module is much lower. Therefore, the common RC absorption protection circuit cannot be directly used for protecting the thyristor module of the switching switch of the complementary thyristor, but the voltage withstanding value of the protection device is greatly increased.
The RC resistance-capacitance absorption protection circuit can reduce the value of dv/dt and can protect the thyristor from being easily triggered by mistake. However, the RC resistor-capacitor absorption protection circuit for suppressing overvoltage disturbance such as surge overvoltage and burst pulse is useless. It is common practice to use a varistor surge protector, which also faces the problem of high withstand voltage of the components.
The utility model discloses an overcome above-mentioned difficult point, provide a protection circuit, can solve the protection problem of mending thyristor switch thyristor module altogether well, have characteristics with low costs, reliable operation, easy to carry out.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a reactive compensation thyristor's protection circuit and thyristor fling-cut switch.
The utility model discloses it is the problem that traditional thyristor switch exists to solve.
Compared with the prior art, the utility model discloses technical scheme and beneficial effect as follows:
a protection circuit for a reactive compensation thyristor, comprising: the overvoltage protection circuit is connected in parallel with two ends of the thyristor; and the resistance-capacitance protection absorption circuit is connected in parallel with two ends of the overvoltage protection circuit.
As a further improvement, the resistance-capacitance protection absorption circuit includes: one end of the first resistor is connected to the output end of the thyristor; one end of the second resistor is connected to the other end of the first resistor; one end of the first subcircuit is connected to the other end of the second resistor; and one end of the second sub-circuit is connected to the other end of the first sub-circuit, and the other end of the second sub-circuit is connected to the input end of the thyristor.
As a further improvement, the first subcircuit includes: the first capacitor is connected to one end, far away from the first resistor, of the second resistor; and the third resistor is connected in parallel with two ends of the first capacitor.
As a further improvement, the second shunt circuit includes: the second capacitor is connected to one end, far away from the second resistor, of the first capacitor; and the fourth resistor is connected in parallel with two ends of the second capacitor.
As a further improvement, the overvoltage protection circuit includes: one end of the fuse is connected to the output end of the thyristor; one end of the third sub-circuit is connected to the other end of the fuse; and one end of the fourth dividing circuit is connected to the other end of the third dividing circuit, and the other end of the fourth dividing circuit is connected to the input end of the thyristor.
As a further improvement, the third sub-circuit includes: a first voltage dependent resistor connected to the fuse; and the fifth resistor is connected in parallel with two ends of the first piezoresistor.
As a further improvement, the fourth dividing circuit includes: the second piezoresistor is connected to one end, far away from the fuse, of the first piezoresistor; and the sixth resistor is connected in parallel with two ends of the second piezoresistor.
As a further improvement, the first piezoresistor is 14D781K in model number.
As a further improvement, the second piezoresistor is 14D781K in model number.
A thyristor switch comprises the protection circuit of the reactive compensation thyristor.
The utility model has the advantages that: the utility model provides a pair of reactive compensation thyristor's protection circuit to the thyristor module in the benefit thyristor switch altogether (certainly also be applicable to and divide the benefit switch), both can provide peak voltage absorption protection, can play the protection to overvoltage such as surge, crowd's pulse again, and the design is simple, and the practicality is strong, the dependable performance.
Drawings
Fig. 1 is a protection circuit diagram of a thyristor of the background art.
Fig. 2 is a wiring diagram of the thyristor switch provided by the embodiment of the present invention.
Fig. 3 is a protection circuit diagram of a reactive compensation thyristor according to an embodiment of the present invention.
Fig. 4 is a schematic waveform diagram of a protection circuit of a reactive compensation thyristor according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a protection circuit of a reactive compensation thyristor according to an embodiment of the present invention.
In the figure: 1. overvoltage protection circuit FU1, fuse 11 and third shunt circuit
MOV1, first voltage dependent resistor R5., fifth resistor 12, and fourth circuit
MOV2, second voltage dependent resistor R6., sixth resistor 2, resistance-capacitance protection absorption circuit
R1, a first resistor R2, a second resistor 21, a first sub-circuit
C1. First capacitor R3, third resistor 22, second shunt circuit
C2. Second capacitor R4, fourth resistor 3 thyristor
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 2 to 5, a protection circuit of a reactive compensation thyristor includes: the overvoltage protection circuit 1 is connected with two ends of the thyristor 3 in parallel; and the resistance-capacitance protection absorption circuit 2 is connected in parallel with two ends of the overvoltage protection circuit 1.
Referring to fig. 3, the rc protection snubber circuit 2 includes: a first resistor R1, wherein one end of the first resistor R1 is connected to the output end of the thyristor 3; a second resistor R2, wherein one end of the second resistor R2 is connected to the other end of the first resistor R1; a first sub-circuit 21, one end of the first sub-circuit 21 being connected to the other end of the second resistor R2; and one end of the second sub-circuit 22 is connected to the other end of the first sub-circuit 21, and the other end of the second sub-circuit 22 is connected to the input end of the thyristor 3.
Referring to fig. 3, the first sub-circuit 21 includes: a first capacitor C1, wherein the first capacitor C1 is connected to one end of the second resistor R2 far away from the first resistor R1; a third resistor R3, the third resistor R3 is connected in parallel with two ends of the first capacitor C1.
Referring to fig. 3, the second shunt circuit 22 includes: the second capacitor C2, the second capacitor C2 is connected to one end of the first capacitor C1 far away from the second resistor R2; a fourth resistor R4, the fourth resistor R4 is connected in parallel to two ends of the second capacitor C2.
Referring to fig. 3, the overvoltage protection circuit 1 includes: a fuse FU1, wherein one end of the fuse FU1 is connected to the output end of the thyristor 3; a third sub-circuit 11, one end of the third sub-circuit 11 is connected to the other end of the fuse FU 1; and one end of the fourth dividing circuit 12 is connected to the other end of the third dividing circuit 11, and the other end of the fourth dividing circuit 12 is connected to the input end of the thyristor 3.
Referring to fig. 3, the third sub-circuit 11 includes: a first varistor MOV1, said first varistor MOV1 connected to said fuse FU 1; a fifth resistor R5, the fifth resistor R5 is connected in parallel across the first varistor MOV1.
Referring to fig. 3, the fourth sub-circuit 12 includes: a second varistor MOV2, the second varistor MOV2 being connected to the end of the first varistor MOV1 remote from the fuse FU 1; a sixth resistor R6, the sixth resistor R6 is connected in parallel across the second varistor MOV2.
The first varistor MOV1 is model 14D 781K. The second varistor MOV2 is model 14D 781K.
A thyristor switch comprises the protection circuit of the reactive compensation thyristor.
The utility model provides a pair of reactive compensation thyristor's protection circuit's theory of operation does:
the working principle of the resistance-capacitance protection absorption circuit 2 is as follows: referring to a circuit diagram shown in FIG. 3, in the RC resistance-capacitance protection absorption circuit 2, R1 and R2 are connected in series, and a power resistor of 27 omega/3W is adopted in the scheme, so that the short-time voltage-resistant impact capability of the resistor is mainly improved; the safety capacitors C1 and C2 can work in an alternating current loop, the capacitance can be selected according to the requirement, the short-time 1-minute withstand voltage of each capacitor can reach 1500Vac, and after the two capacitors are connected in series, no pressure exists for the peak voltage of 1300 Vpk. To ensure that the voltage division across each capacitor is uniform, C1 and C2 are each connected in parallel with a 1M Ω/3W balancing resistor. In fact, each compensation capacitor is provided with a discharge power resistor, and after the switching is stopped, the direct current voltage Vdc will gradually approach 0V and will not continue all the time, as shown in fig. 4, the voltage waveform before the switch is switched on.
The operating principle of the overvoltage protection circuit 1 is as follows: the circuit adopts two zinc oxide piezoresistors MOV1 and MOV2 which are used in series, the specification is 14D781, the protection voltage after the two series connection is about 1560V, and the protection is safe for a thyristor module with the voltage resistance of 1800V. The piezoresistor is used as a surge protection device and is more sensitive to the voltage applied to two ends of the piezoresistor, and the equalizing resistors R5 and R6 (the value of the scheme is 1M omega/3W) are respectively connected in parallel to two ends of the piezoresistor MOV1 and MOV2, so that the partial voltage obtained by the piezoresistor and the equalizing resistor is almost equal, and the piezoresistor can have the optimal working characteristic; the performance of the piezoresistor gradually tends to be degraded along with the increase of the impact times, the piezoresistor is usually in a short-circuit state at the end of the service life, in order to ensure that the normal work of the fling-cut switch is not influenced by the performance of the protection module, the branch is provided with a fuse FU1 of 3A, once the piezoresistor is in short circuit, the fuse FU1 is fused quickly by power frequency current, and the overvoltage protection branch is disconnected.
In conclusion, the protection circuit of the reactive compensation thyristor can provide peak voltage absorption protection for the thyristor modules in the common compensation thyristor switch (certainly, the protection circuit is also suitable for the sub-compensation switch), can also protect overvoltage such as surge and pulse group, and is simple in design, strong in practicability and reliable in performance.
The working principle, working process and the like of the present embodiment can refer to the corresponding contents of the foregoing embodiments.
The above examples are only for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that any modification and equivalent arrangement that do not depart from the spirit and scope of the invention should fall within the scope of the claims of the invention.
Claims (10)
1. A protection circuit for a reactive compensation thyristor, comprising:
the overvoltage protection circuit is connected in parallel with two ends of the thyristor;
and the resistance-capacitance protection absorption circuit is connected in parallel with two ends of the overvoltage protection circuit.
2. A protection circuit of a reactive power compensation thyristor according to claim 1, wherein the resistance-capacitance protection snubber circuit comprises:
one end of the first resistor is connected to the output end of the thyristor;
one end of the second resistor is connected to the other end of the first resistor;
one end of the first subcircuit is connected to the other end of the second resistor;
and one end of the second sub-circuit is connected to the other end of the first sub-circuit, and the other end of the second sub-circuit is connected to the input end of the thyristor.
3. A protection circuit for a reactive power compensation thyristor according to claim 2, wherein the first subcircuit comprises:
the first capacitor is connected to one end, far away from the first resistor, of the second resistor;
and the third resistor is connected in parallel with two ends of the first capacitor.
4. A protection circuit for a reactive power compensation thyristor according to claim 3, wherein the second sub-circuit comprises:
the second capacitor is connected to one end, far away from the second resistor, of the first capacitor;
and the fourth resistor is connected in parallel with two ends of the second capacitor.
5. A protection circuit for a reactive power compensation thyristor according to claim 1, wherein the overvoltage protection circuit comprises:
one end of the fuse is connected to the output end of the thyristor;
one end of the third sub-circuit is connected to the other end of the fuse;
and one end of the fourth dividing circuit is connected to the other end of the third dividing circuit, and the other end of the fourth dividing circuit is connected to the input end of the thyristor.
6. A protection circuit for a reactive power compensation thyristor according to claim 5, wherein the third shunting circuit comprises:
a first voltage dependent resistor connected to the fuse;
and the fifth resistor is connected in parallel with two ends of the first piezoresistor.
7. A protection circuit for a reactive power compensating thyristor according to claim 6, wherein the fourth shunting circuit comprises:
the second piezoresistor is connected to one end, far away from the fuse, of the first piezoresistor;
and the sixth resistor is connected in parallel with two ends of the second piezoresistor.
8. A reactive power compensation thyristor protection circuit according to claim 6, wherein the first varistor is 14D781K type.
9. A reactive power compensation thyristor protection circuit according to claim 7, wherein the second varistor is 14D781K type.
10. A thyristor-switched switch comprising a protection circuit for a reactive power compensating thyristor according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023245375.4U CN214337561U (en) | 2020-12-29 | 2020-12-29 | Protection circuit of reactive compensation thyristor and thyristor fling-cut switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023245375.4U CN214337561U (en) | 2020-12-29 | 2020-12-29 | Protection circuit of reactive compensation thyristor and thyristor fling-cut switch |
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| CN214337561U true CN214337561U (en) | 2021-10-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114124054A (en) * | 2021-11-19 | 2022-03-01 | 广东福德电子有限公司 | Reliable trigger circuit of series thyristor |
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2020
- 2020-12-29 CN CN202023245375.4U patent/CN214337561U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114124054A (en) * | 2021-11-19 | 2022-03-01 | 广东福德电子有限公司 | Reliable trigger circuit of series thyristor |
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