CN206211495U - From disengaging combination overvoltage protector - Google Patents

Abstract

The utility model relates to a self-detachment combined overvoltage protector, which comprises three first elements connected to three phases and a second element grounded, the first element includes safety fuses connected in series from the input end, The first discharge gap module, the first zinc oxide protection resistor, the first element is connected in series with the first current transformer, and the second element includes the second zinc oxide protection resistor and the second discharge gap module arranged in series A second current transformer is connected in series with the wiring of the second component, and the outer frames of the first and second components are a sealed and insulated one-piece structure. It solves the problem of the protector explosion when the rated flow rate of the protector itself is exceeded, ensures that the zinc oxide protective resistor will not cause thermal collapse and explosion, realizes the disadvantage that the protector itself cannot be protected when the rated value of the protector is exceeded, and reduces the resulting secondary damage. accidents, to ensure that the power supply system can operate normally for a long time.

Description

Self-disconnecting combined overvoltage protector

technical field

The utility model relates to the field of electrical equipment, in particular to a self-detachment combined overvoltage protector.

Background technique

The combined overvoltage protector is mainly used in power plants, substations and other types of power supply and consumption systems, for phase-to-phase and phase-to-ground operations caused by atmospheric overvoltages and switch fits on motors, transformers, switches, busbars and other electrical equipment. Overvoltage plays a limiting role to protect the insulation of electrical equipment from damage, and is widely used in overvoltage protection of electrical equipment.

The existing combined overvoltage protectors often have complex overvoltage conditions on site, and there will be instantaneous overvoltage with large energy, which will lead to overheating of the zinc oxide protection resistor of the protector, resulting in thermal collapse and explosion of the combined overvoltage protector, resulting in accidents. .

Contents of the invention

The purpose of the utility model is to provide a self-detachment combined overvoltage protector, which solves the problem of the protector explosion when the rated flow rate of the protector itself is exceeded, ensures that the zinc oxide protection resistor will not cause thermal collapse and explosion, and realizes exceeding the rated value of the protector. The disadvantage of not being able to protect the protector itself, reducing the secondary accidents caused by it, and ensuring the normal operation of the power supply system for a long time.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a self-disconnecting combined overvoltage protector, including three first elements connected to three phases and a second element connected to ground, and the first element includes The safety fuse, the first discharge gap module, and the first zinc oxide protection resistor are serially connected in series from the input end, and the first current transformer is connected in series on the wiring of the first element, and the second element includes a second element arranged in series. The zinc oxide protection resistor and the second discharge gap module are connected in series with the second current transformer. The outer frames of the first and second elements are integral structures with sealing and insulation.

The technical effect of the utility model lies in: aiming at the characteristic that the current passing through the protector is large when the rated flow rate is exceeded, a safety fuse is installed on the protector to realize the separation and disconnection of the protector from the power supply system when the overcurrent occurs, and realize the first Zinc oxide protects the resistor from thermal collapse and explosion. In this way, the safety fuse solves the disadvantage that the protector itself cannot be protected when the rated value of the protector is exceeded, reduces the secondary accident rate caused by it, and ensures that the power supply system can run normally for a long time. And the first and second current transformers are connected in series on the connection of the first element connected to the three phases and the second element connected to the ground of the protector, and the first and second current transformers are respectively connected to the three-phase and grounded Current, through the obtained current to analyze the number of overvoltages of the protector, so as to infer how long the protector is from the end of its service life, so as to further prevent the protector from exploding and prevent accidents.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the electrical schematic diagram of the utility model.

detailed description

Referring to the accompanying drawings, a self-disconnecting combined overvoltage protector includes three first elements 10 connected to three phases and a second element 20 grounded. The first element 10 includes fuses connected in series from the input end. A fuse 11, a first discharge gap module 12, a first zinc oxide protection resistor 13, a first current transformer 14 is connected in series on the wiring of the first element 10, and the second element 20 includes a second oxide The zinc protection resistor 21 and the second discharge gap module 22, the second current transformer 24 is connected in series on the wiring of the second element 20, and the outer frames of the first and second elements (10, 20) are sealed and insulated One-piece structure.

In view of the fact that the current passing through the protector is large when the rated flow rate is exceeded, a safety fuse 11 is installed on the protector to realize that the protector is disconnected from the power supply system when the overcurrent occurs, and the first zinc oxide protection resistor 13 is not There will be a thermal collapse explosion. In this way, the safety fuse 11 solves the disadvantage that the protector itself cannot be protected when the rated value of the protector is exceeded, reduces the secondary accident rate caused thereby, and ensures that the power supply system can run normally for a long time. In addition, first and second current transformers 14 and 24 are respectively connected in series on the connections of the three-phase first component 10 and the grounding second component 20 of the protector. The first and second current transformers 14 and 24 are respectively Take the current of three phases and grounding, and analyze the overvoltage times of the protector through the obtained current, so as to infer how long the protector is from the end of its service life, so as to further prevent the protector from exploding and prevent accidents.

Further, the first discharge gap module 12 includes a discharge gap and a high voltage resistor arranged in parallel.

Further, the second discharge gap module 22 includes a discharge gap and a high voltage resistor arranged in parallel.

The first and second discharge gap modules 12 and 22 use high-voltage resistors connected in parallel on the discharge gap, which do not need to rely on power frequency zero-crossing to extinguish the arc, and the arc extinguishing is rapid and the arc extinguishing voltage is high. And because the high-voltage resistor is connected in series with the zinc oxide protection resistor (the first zinc oxide protection resistor 13 or the second zinc oxide protection resistor 21), the voltage distribution is uniform under normal conditions, and each bears half of the power frequency voltage, so that the power frequency discharge The voltage dispersion is small, and the working discharge is stable.

Still further, the first component 10 includes an installation sleeve 10a and an outstretched cable lead 10b arranged on the installation sleeve 10a, the safety fuse 11, the first discharge gap module 12, the first zinc oxide protection resistor 13. The first current transformer 14 is arranged in the installation sleeve 10a, and the bottom of the installation sleeve 10a and the upper frame surface of the second component 20 form an integral structure of sealing and insulation.

In this way, the insulation performance is good, the seal is high, and the dielectric strength is high, which prevents the protector from working due to leakage.

Claims (4)

1. A self-disconnecting combined overvoltage protector, comprising three first elements (10) connected to three phases and a second element (20) grounded, characterized in that: the first element (10) It includes a safety fuse (11), a first discharge gap module (12), a first zinc oxide protection resistor (13) connected in series from the input end, and a first current transformer connected in series on the wiring of the first element (10) (14), the second element (20) includes the second zinc oxide protection resistor (21) and the second discharge gap module (22) arranged in series, and the second element (20) is connected in series with the second In the current transformer (24), the outer frames of the first and second elements (10, 20) are a sealed and insulated integrated structure. 2. The self-disconnecting combined overvoltage protector according to claim 1, characterized in that: the first discharge gap module (12) includes a discharge gap and a high-voltage resistor arranged in parallel. 3. The self-disconnecting combined overvoltage protector according to claim 1, characterized in that: the second discharge gap module (22) includes a discharge gap and a high-voltage resistor arranged in parallel. 4. The self-detachment combined overvoltage protector according to claim 1, characterized in that: the first component (10) includes a mounting sleeve (10a) and an outwardly extending cable lead arranged on the mounting sleeve (10a) (10b), the safety fuse (11), the first discharge gap module (12), the first zinc oxide protection resistor (13), and the first current transformer (14) are arranged on the installation sleeve (10a) Inside, the bottom of the installation sleeve (10a) and the upper frame surface of the second element (20) form a sealed and insulated integrated structure.