CN213637485U - Thyristor transient protection device with reactor - Google Patents

Abstract

The utility model relates to a take thyristor transient state protection device of reactor, the intelligent cabinet temperature adjusting device comprises a cabinet body, the internally mounted of the cabinet body has contactor, current transformer, voltage transformer, miniaturized valve group body, reactor, the bottom of the cabinet body is provided with main circuit input line, main circuit output line, the main circuit input line with current transformer's input electric connection, current transformer's output with the input electric connection of miniaturized valve group body and contactor, the output of miniaturized valve group body with the input electric connection of reactor, the output of reactor, contactor all with main circuit output line electric connection, current transformer with be connected with voltage transformer between the contactor. The transient protection device of the thyristor with the reactor can prevent the damage of instantaneous heavy current in a primary loop to electric devices in the loop.

Description

Thyristor transient protection device with reactor

Technical Field

The utility model belongs to the technical field of the solid-state soft starter technique of high pressure and specifically relates to a take thyristor transient state protection device of reactor.

Background

The high-voltage solid soft starter is also called medium-high voltage solid soft starter, is a novel medium-high voltage motor soft starter, is mainly suitable for medium-high voltage alternating current motors below 10KV, adopts advanced DSP control technology, power electronic technology and mainly comprises a three-phase anti-parallel brake pipe and an electronic control circuit thereof, wherein the three-phase anti-parallel brake pipe is connected between a power supply and a controlled motor in series. Different methods are used to control the conduction angle of the three-phase anti-parallel brake tube, so that the input voltage of the controlled motor can be changed according to different requirements, and different functions can be realized.

An existing MPS is not integrated with a reactor generally, the reactor mainly prevents instantaneous large current in a primary loop from damaging electric devices in the loop, and the instantaneous large current is generated due to a plurality of reasons, such as short circuit caused by wiring errors or instantaneous overcurrent caused by high-voltage switching-on, cable grounding and capacitive load at a terminal. There is therefore a need for a thyristor transient protection device with a reactor to prevent damage to electrical components in the circuit from transient high currents in the primary circuit.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem who exists among the prior art, provide a thyristor transient state protection device of electrified reactor to prevent that instantaneous heavy current in the primary circuit from causing the damage to electrical part in the return circuit.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a take thyristor transient state protection device of reactor, the intelligent cabinet temperature adjusting device comprises a cabinet body, the internally mounted of the cabinet body has contactor, current transformer, voltage transformer, miniaturized valve group body, reactor, the bottom of the cabinet body is provided with main circuit input line, main circuit output line, the main circuit input line with current transformer's input electric connection, current transformer's output with the input electric connection of miniaturized valve group body and contactor, the output of miniaturized valve group body with the input electric connection of reactor, the output of reactor, contactor all with main circuit output line electric connection, current transformer with be connected with voltage transformer between the contactor.

Preferably, in the transient protection device with a reactor, the miniaturized valve group body is formed by connecting a plurality of groups of valve group units in series, and each group of valve group units includes two thyristors connected in opposite directions.

Preferably, in the transient protection device for a thyristor with a reactor, an instrument installation chamber is arranged on the cabinet body, and an insulating plate is arranged on each side surface of the instrument installation chamber, which is located inside the cabinet body, and is suitable for preventing high voltage inside the cabinet body from interfering with an instrument inside the instrument installation chamber.

Preferably, in the above thyristor transient protection device with reactor, the lightning arrester is installed at the bottom of the cabinet body, and is suitable for preventing lightning strike.

Preferably, in the above thyristor transient protection device with a reactor, a cable trench is disposed at the bottom of the cabinet body, and is adapted to lead out a main circuit input line and a main circuit output line.

Preferably, in the transient protection device for a thyristor with a reactor, a vertical partition plate is arranged inside the cabinet body, the voltage transformer, the miniaturized valve assembly body and the instrument installation chamber are located on one side of the partition plate, and the contactor, the current transformer and the reactor are located on the other side of the partition plate, so that the installation and fixation of each component and the space in the cabinet body can be conveniently and fully utilized.

The utility model has the advantages that: the current enters from the bottom of the cabinet body along the input line of the main circuit, flows through the current transformer and the voltage transformer, the contactor is in a disconnected state in the initial stage, the current passes through the miniaturized valve group body and the reactor, the output line of the main circuit is led out of the cabinet body and then is connected with the load motor, therefore, the load motor is conducted through the miniaturized valve group body and the reactor in the initial stage, the anti-parallel thyristor is used as a voltage regulator when the current flows through the single valve group, the output voltage of the thyristor is gradually increased, the motor is gradually accelerated until the thyristor is fully conducted, the motor works on the mechanical characteristic of rated voltage, smooth starting is realized, starting current is reduced, and. And meanwhile, the reactor can prevent instantaneous large current in the primary loop from damaging electric devices in the loop. After the load motor operates stably, the contactor is switched on, the contactor enables the miniaturized valve group body and the reactor bypass to enable current to flow through the load motor through the contactor, and stable operation of the load motor is guaranteed. The transient protection device of the thyristor with the reactor can prevent the damage of instantaneous heavy current in a primary loop to electric devices in the loop.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a circuit diagram of the present invention;

FIG. 3 is a schematic view of a miniaturized valve assembly;

fig. 4 is a schematic view of the position relationship between the cabinet and the cable trench.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the cabinet body, 2, instrument installation room, 3, voltage transformer, 4, miniaturized valve group body, 5, current transformer, 6, main circuit input line, 7, main circuit output line, 8, reactor, 9, contactor, 10, insulation board, 11, cable pit, 12, copper bar, 13, insulating column, 14, valves monomer, 15, arrester, 16, cable staple bolt.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 and 4, a thyristor transient protection device with a reactor includes a cabinet 1, and a contactor 9, a current transformer 5, a voltage transformer 3, a miniaturized valve assembly 4, and a reactor 8 are installed inside the cabinet 1. The bottom of the cabinet body 1 is provided with a main circuit input line 6 and a main circuit output line 7, and the bottom of the cabinet body 1 is provided with a cable trench 11 suitable for leading out the main circuit input line 6 and the main circuit output line 7. The cabinet body 1 is internally provided with a cable hoop 16, and the cable hoop 16 is convenient for fixing the main circuit input line 6. The main circuit input line 6 is electrically connected with the input end of the current transformer 5, the output end of the current transformer 5 is electrically connected with the input ends of the miniaturized valve assembly 4 and the contactor 9, the output end of the miniaturized valve assembly 4 is electrically connected with the input end of the reactor 8, the output ends of the reactor 8 and the contactor 9 are electrically connected with the main circuit output line 7, and the voltage transformer 3 is connected between the current transformer 5 and the contactor 9.

As shown in fig. 1 and 3, because the voltage in the main circuit is high, the electric devices are electrically connected through the copper bar 12. The copper bar 12 is fixed by the insulating column 13. The miniaturized valve assembly 4 is formed by connecting a plurality of groups of valve unit 14 in series, and each group of valve unit 14 comprises two thyristors which are reversely connected. The inside of the cabinet body 1 is provided with vertical baffle, and voltage transformer 3, miniaturized valve unit 4, instrument installation room 2 are located one side of baffle, and contactor 9, current transformer 5, reactor 8 are located the opposite side of baffle, and the installation of each components and parts of being convenient for is fixed, the make full use of space in the cabinet body 1 of being convenient for. Be provided with instrument installation room 2 on the cabinet body 1, all be provided with insulation board 10 on the each side that is located cabinet body 1 inside of instrument installation room 2, be suitable for to prevent that the instrument in the instrument installation room 2 from causing the interference to the high pressure in the cabinet body 1. The current transformer 5 and the voltage transformer 3 are used for measuring current and voltage values in the main circuit, and are displayed through an instrument in the instrument installation chamber 2, so that real-time monitoring is facilitated. The bottom of the cabinet body 1 is provided with a lightning arrester 15 suitable for preventing lightning stroke.

As shown in fig. 2, current enters from the bottom of the cabinet 1 along the main circuit input line 6, flows through the current transformer 5 and the voltage transformer 3, the contactor 9 is in an off state in the initial stage, the current passes through the miniaturized valve assembly 4 and the reactor 8, and the main circuit output line 7 is connected with the load motor after being led out of the cabinet 1, so that the load motor is conducted through the miniaturized valve assembly 4 and the reactor 8 in the initial stage, the anti-parallel thyristor is used as a voltage regulator when the current passes through the valve assembly unit 14, the output voltage of the thyristor gradually increases, the motor gradually accelerates until the thyristor is fully conducted, the motor works on the mechanical characteristic of rated voltage, smooth starting is realized, the starting current is reduced, and overcurrent tripping is avoided. At the same time the reactor 8 prevents the instantaneous high current in the primary circuit from damaging the electrical components in the circuit. After the load motor operates stably, the contactor 9 is conducted, at the moment, the contactor 9 bypasses the miniaturized valve assembly 4 and the reactor 8, current flows through the load motor through the contactor 9, and stable operation of the load motor is guaranteed. The transient protection device of the thyristor with the reactor can prevent the damage of instantaneous heavy current in a primary loop to electric devices in the loop.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for convenience of description and simplification of description, but not for indicating or implying that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the 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 otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims (6)

1. The utility model provides a thyristor transient state protection device of electrified reactor which characterized in that: comprises a cabinet body (1), wherein a contactor (9), a current transformer (5), a voltage transformer (3), a miniaturized valve group body (4) and a reactor (8) are arranged in the cabinet body (1), a main circuit input line (6) and a main circuit output line (7) are arranged at the bottom of the cabinet body (1), the main circuit input line (6) is electrically connected with the input end of the current transformer (5), the output end of the current transformer (5) is electrically connected with the input ends of the miniaturized valve group body (4) and the contactor (9), the output end of the miniaturized valve assembly body (4) is electrically connected with the input end of the reactor (8), the output ends of the reactor (8) and the contactor (9) are electrically connected with the main circuit output line (7), and a voltage transformer (3) is connected between the current transformer (5) and the contactor (9).

2. The thyristor transient protection device with reactor of claim 1, wherein: the miniaturized valve group body (4) is formed by connecting a plurality of groups of valve group single bodies (14) in series, and each group of valve group single bodies (14) comprises two thyristors which are reversely connected.

3. The thyristor transient protection device with reactor of claim 1, wherein: be provided with instrument installation room (2) on the cabinet body (1), all be provided with insulation board (10) on being located the inside each side of the cabinet body (1) of instrument installation room (2), be suitable for and prevent that the instrument in the instrument installation room (2) from causing the interference to the high pressure in the cabinet body (1).

4. The thyristor transient protection device with reactor of claim 1, wherein: the bottom of the cabinet body (1) is provided with a lightning arrester (15) suitable for preventing lightning stroke.

5. The thyristor transient protection device with reactor of claim 1, wherein: the bottom of the cabinet body (1) is provided with a cable trench (11) suitable for leading out a main circuit input line (6) and a main circuit output line (7).

6. The thyristor transient protection device with reactor of claim 1, wherein: the utility model discloses a cabinet, including the cabinet body, the inside of the cabinet body (1) is provided with vertical baffle, voltage transformer (3), the miniaturized valve group body (4), instrument installation room (2) are located one side of baffle, contactor (9), current transformer (5), reactor (8) are located the opposite side of baffle, the installation of each components and parts of being convenient for is fixed, the space in the make full use of cabinet body (1) of being convenient for.

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