CN215817509U

CN215817509U - Thyristor protection alarm system

Info

Publication number: CN215817509U
Application number: CN202121323118.XU
Authority: CN
Inventors: 鲍居龙; 鲍乔哲
Original assignee: Wuhan Nuojinxin Technology Co ltd; Beijing Zhuiri Electric Co ltd
Current assignee: Wuhan Nuojinxin Technology Co ltd; Beijing Zhuiri Electric Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-02-11
Anticipated expiration: 2031-06-15

Abstract

A thyristor protection alarm system is characterized in that a high-voltage bus (10) passes through a through hole of an energy acquisition CT (4), a high-voltage CT power taking device consisting of an AC/DC module (5) provides power supply, a current limiting resistor (6) and a fast fuse protector switch (3) are connected into a closed loop, a connecting lead passes through a sensor magnetic ring (7), when the thyristor assembly (1) normally operates, the fast fuse protection switch (3) is switched off, no current flows in the loop, when the thyristor assembly (1) breaks down, the fast fuse (2) is fused, the fast fuse protection switch (3) is closed, direct current is generated in a loop, the induced current of the sensor induction coil (8) drives the relay to act through the relay driving circuit (9), and the relay contact is connected to the relay protection circuit or the sound-light alarm circuit as required, so that relay protection or sound-light alarm is realized.

Description

Thyristor protection alarm system

Technical Field

The utility model designs a protection alarm system, in particular to a thyristor protection alarm system.

Background

In the low-voltage thyristor control circuit, the fast fuse fuses after the thyristor breaks down, the switch of the fast fuse acts, and the switch state signal is directly sent to the control loop to protect tripping or sound and light alarm. However, in the voltage regulating loop of the high-voltage thyristor string, because the protection fast fuse is directly connected with the high-voltage main loop, the switch of the fast fuse is also in a high potential state, and a switch state signal after fusing cannot be directly sent to the control loop, so that the switching-off and alarming cannot be protected, and the accident can be further expanded.

Disclosure of Invention

In order to overcome the defect that the fusing signal of a fast fuse cannot be directly sent to a low-voltage control loop to realize protection action and alarm under the condition that a thyristor is broken down in the conventional high-voltage thyristor voltage regulating system, the utility model provides a novel thyristor protection alarm system.

Drawings

The utility model is further described below with reference to the accompanying drawings.

Fig. 1 is a wiring schematic of a preferred embodiment of the present invention.

Fig. 2 is a diagram of a sensor profile in accordance with a preferred embodiment of the present invention.

The reference numbers in the figures denote: the circuit comprises a 1-thyristor assembly, a 2-fast fuse, a 3-fast fuse protection switch, a 4-energy-taking CT, a 5-AC/DC module, a 6-current-limiting resistance plate, a 7-sensor magnetic ring, an 8-sensor induction coil, a 9-relay driving circuit and a 10-C main bus.

Referring to fig. 1, a thyristor protection alarm system, a high voltage CT power supply device composed of a high voltage bus (10) passing through a through hole of a power supply CT (4) and an AC/DC module (5) provides power, a current limiting resistor (6) and a fast fuse protection switch (3) are connected to form a closed loop, a connecting wire passes through a sensor magnetic ring (7), when the thyristor assembly (1) normally operates, the fast fuse protection switch (3) is disconnected, no current flows in the loop, when the thyristor assembly (1) breaks down, the fast fuse (2) is fused, the fast fuse protection switch (3) is closed, a direct current is generated in the loop, an induced current of a sensor induction coil (8) drives a relay to act through a relay driving circuit (9), and a relay contact is connected to a relay protection circuit or an audible and visual alarm circuit as required, realizing relay protection or audible and visual alarm.

The wire passing through the sensor magnetic ring (7) adopts a high-voltage silica gel flexible wire with the same voltage grade as the voltage grade of the thyristor voltage regulating loop, so that the potential isolation between the high-voltage side and the low-voltage side is realized.

The sensor magnetic ring (7), the induction coil (8) and the relay drive circuit (9) are integrally encapsulated into a sensor, and the outline drawing of the sensor is shown in figure 2.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions are only illustrative of the structural relationship and principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the utility model, and these changes and modifications are within the scope of the utility model as hereinafter claimed.

The scope of the utility model is defined by the appended claims and equivalents thereof.

Detailed Description

The technical scheme adopted by the utility model for solving the technical problems is as follows: a thyristor protection alarm system comprises a high-voltage CT power taking device, a fast fuse with a protection switch, a current-limiting resistance plate and a sensor. The method is characterized in that: the CT power taking device, the fast fuse protection switch and the current limiting resistance plate are connected into a closed loop by adopting a high-voltage silica gel flexible wire, the high-voltage silica gel wire also penetrates through a through hole of the sensor, when the thyristor normally works, the fast fuse protection switch is disconnected, the loop has no current, when the thyristor breaks through the fuse and is fused, the protection switch is closed, the loop generates current, the loop current is induced to a low potential side through the sensor, and the relay is driven to act, so that the relay protection action or the audible and visual alarm is realized.

Furthermore, the CT power taking device, the fast fuse with the protection switch and the current limiting resistance plate are arranged on one side of the high potential of the thyristor protection alarm system, the sensor is arranged on one side of the low potential of the thyristor protection alarm system, and the high-voltage silica gel line penetrates through the center of the sensor to play roles in signal transmission and high-low potential isolation.

Furthermore, the high-voltage CT power taking device is a traditional CT power taking device, energy is taken from busbar current passing through a through hole of the CT power taking device, and an AC/DC module with wide input voltage is adopted to generate stable direct-current voltage to be used as a power supply on a high potential side.

Furthermore, the current-limiting resistance plate adopts a plurality of resistors with larger resistance values to be welded on the PCB in parallel so as to reduce the power of a single resistor.

Further, the sensor comprises a choke coil based on the magnetic ring and a relay driving circuit, and when a high-voltage silica gel wire passing through the magnetic ring passes through current, the induced current of the sensor induction coil drives the relay to act.

The utility model has the advantages and characteristics that:

1. the standard CT electricity taking device is used as a power supply at a high potential side, and the voltage is stable and reliable.

2. And a high-voltage silica gel line is adopted for current signal transmission and potential isolation, and the isolation distance is far greater than the safety distance.

3. The high-potential switch state signal is converted into an electric signal and is transmitted to the low-potential side through electromagnetic induction, the high potential and the low potential are in electromagnetic connection, and the high voltage and the low voltage are completely isolated.

4. The circuit is simple and the cost is low.

Claims

1. A thyristor protection alarm system which characterized in that: the high-voltage CT power taking device comprises a power taking CT (4) and an AC/DC (alternating current/direct current) module (5), wherein the power taking CT device converts current flowing through a high-voltage bus into stable direct-current voltage, and also comprises a current limiting resistance plate (6) which converts the on-off state of a high-potential side fast fuse protection switch (3) into a current signal, the current signal passes through a sensor magnetic ring (7) and is subjected to electromagnetic induction, an induced current is induced in a sensor induction coil (8), and the induced current drives a relay to act through a relay driving circuit (9), so that the relay protection or the acousto-optic alarm of a low-potential side is realized.

2. A thyristor protection alarm system according to claim 1, characterised in that: the wire penetrating through the magnetic ring is a high-voltage flexible cable with the same voltage grade as the main loop of the thyristor assembly, so that the isolation of high and low potential is realized while the current transmission is realized.

3. A thyristor protection alarm system according to claim 1, characterised in that: the current-limiting resistance plate is formed by welding a plurality of resistors with equal resistance values on a PCB in parallel.

4. A thyristor protection alarm system according to claim 1, characterised in that: the sensor is formed by integrally encapsulating a sensor magnetic ring (7), an induction coil (8) and a relay drive circuit (9).