CN203180517U - Microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device - Google Patents

Abstract

A microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device relates to the technical field of arc extinguishing and harmonic eliminating of an electric power system. The microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device comprises a high-voltage current-limiting fuse, a voltage transformer, a three-phase combined type overvoltage protector, a vacuum contactor, a microcomputer arc-extinguishing controller, a high-voltage fuse, and a zero-sequence current transformer, wherein three-phase ports of the three-phase combined type overvoltage protector are respectively connected with a three-phase high-voltage isolation switch; a grounding terminal of the three-phase combined type overvoltage protector is connected with the voltage transformer and then grounded; the high-voltage fuse is connected in series between three-phase ports of the voltage transformer and the three-phase high-voltage isolation switch; a voltage transformer control terminal of the microcomputer arc-extinguishing controller is connected with the voltage transformer; a vacuum contactor control terminal of the microcomputer arc-extinguishing controller is connected with the vacuum contactor; three-phase ports of the high-voltage current-limiting fuse are respectively connected with the three-phase high-voltage isolation switch, while the other ends of the high-voltage current-limiting fuse are connected with the vacuum contactor; a grounding terminal of the vacuum contactor is grounded; and the zero-sequence current transformer is arranged between the grounding terminal of the vacuum contactor and a grounding point. The overvoltage-protecting device provided by the utility model is high in action speed and capable of arc-extinguishing and harmonic-eliminating.

Description

Microcomputer arc suppression and harmonic elimination and overvoltage protection device

technical field

The utility model relates to the technical field of arc suppression and harmonic elimination in electric power systems, in particular to a microcomputer arc suppression and harmonic elimination and overvoltage protection device.

Background technique

At present, in the 3-35KV neutral point non-directly grounded power system, since various overvoltage protectors have no arc suppression, harmonic elimination functions, or single functions, it cannot effectively avoid the atmospheric overvoltage caused by the system phase-to-phase and phase-to-ground , single-phase intermittent arc grounding overvoltage, ferromagnetic resonance overvoltage and other accidents, these overvoltages pose a certain threat to the life and operation safety of power system equipment.

Contents of the invention

The purpose of the utility model is to provide an overvoltage protection device with fast action speed, arc suppression and harmonic elimination.

In order to solve the problems existing in the background technology, the utility model adopts the following technical solutions: it includes a high-voltage current-limiting fuse FU, a voltage transformer PT, a three-phase combined overvoltage protector LBP, a vacuum contactor JZ, a microcomputer Arc controller ZK, high voltage fuse RD, zero sequence current transformer LH;

The microcomputer arc suppression controller ZK includes a voltage transformer control terminal and a vacuum contactor control terminal;

The three-phase ports of the three-phase combined overvoltage protector LBP are respectively connected to a three-phase high-voltage isolating switch, the ground terminal of the three-phase combined overvoltage protector LBP is connected to the voltage transformer PT and then grounded, and the three terminals of the voltage transformer PT A high-voltage fuse RD is connected in series between the phase port and the three-phase high-voltage isolating switch. The three-phase ports of the current fuse FU are respectively connected to the three-phase high-voltage isolating switch, the other end is connected to the vacuum contactor JZ, the grounding end of the vacuum contactor JZ is grounded, and a zero-sequence current transformer is arranged between the grounding end of the vacuum contactor JZ and the grounding point LH.

When the arc is grounded, the device can quickly ground the faulty phase directly, and the overvoltages between various phases and phases are limited to a lower voltage level, reducing the insulation accidents and arrester explosion accidents caused by it. , when metal grounding occurs, the contact voltage and step voltage can be greatly reduced, which is conducive to ensuring personal safety. When a voltage transformer PT disconnection fault occurs, the device outputs a contact signal so that users PT disconnection causes the relay protection of malfunction to be blocked.

The microcomputer arc suppression harmonic elimination and overvoltage protection device of the utility model takes the microcomputer arc suppression controller as the core control component, judges and displays the fault phase and fault type according to the signal provided by the voltage transformer, and controls according to the set method Phase-separated control of high-voltage vacuum contactors, according to the principle of the largest mutation value of the faulty line before and after the grounding arc is extinguished, the faulty line is selected and the passive switch contact signal is output at the same time. Therefore, the utility model has a fast action speed and effectively solves the problems of arc suppression and harmonic elimination in the overvoltage protection device.

Description of drawings

Fig. 1 is the electrical schematic diagram of the utility model

Detailed ways

Referring to Figure 1, a microcomputer arc suppression harmonic elimination and overvoltage protection device, which includes a high-voltage current-limiting fuse FU, a voltage transformer PT, a three-phase combined overvoltage protector LBP, a vacuum contactor JZ, and a microcomputer arc suppression control Device ZK, high voltage fuse RD, zero sequence current transformer LH;

The microcomputer arc suppression controller ZK includes a voltage transformer control terminal and a vacuum contactor control terminal;

The three-phase ports of the three-phase combined overvoltage protector LBP are respectively connected to a three-phase high-voltage isolating switch, the ground terminal of the three-phase combined overvoltage protector LBP is connected to the voltage transformer PT and then grounded, and the three terminals of the voltage transformer PT There is a high-voltage fuse RD in series between the phase port and the three-phase high-voltage isolating switch, the voltage transformer control terminal of the microcomputer arc suppression controller ZK is connected to the voltage transformer PT, the vacuum contactor control terminal is connected to the vacuum contactor JZ, The three-phase ports of the current fuse FU are respectively connected to the three-phase high-voltage isolating switch, the other end is connected to the vacuum contactor JZ, the grounding end of the vacuum contactor JZ is grounded, and a zero-sequence current transformer is arranged between the grounding end of the vacuum contactor JZ and the grounding point LH.

When the arc is grounded, the device can quickly ground the faulty phase directly, and the overvoltages between various phases and phases are limited to a lower voltage level, reducing the insulation accidents and arrester explosion accidents caused by it. , when metal grounding occurs, the contact voltage and step voltage can be greatly reduced, which is conducive to ensuring personal safety. When a voltage transformer PT disconnection fault occurs, the device outputs a contact signal so that users PT disconnection causes the relay protection of malfunction to be blocked.

The microcomputer arc suppression harmonic elimination and overvoltage protection device of the utility model takes the microcomputer arc suppression controller as the core control component, judges and displays the fault phase and fault type according to the signal provided by the voltage transformer, and controls according to the set method Phase-separated control of high-voltage vacuum contactors, according to the principle of the largest mutation value of the faulty line before and after the grounding arc is extinguished, the faulty line is selected and the passive switch contact signal is output at the same time. Therefore, the utility model has a fast action speed and effectively solves the problems of arc suppression and harmonic elimination in the overvoltage protection device.

Claims (1)

1. a microcomputer extinguishing arc harmonic elimination and overvoltage protection, it is characterized in that it comprises high-voltage and current-limitation fuse (FU), voltage transformer (PT), three phase combined over-voltage protector (LBP), vacuum contactor (JZ), microcomputer arc-suppressing controller (ZK), high-tension fuse (RD), zero sequence current mutual inductor (LH);

Described microcomputer arc-suppressing controller (ZK) comprises voltage transformer control end, vacuum contactor control end;

The three-phase port of described three phase combined over-voltage protector (LBP) connects three-phase high-voltage isolating switch respectively; three phase combined over-voltage protector (LBP) earth terminal is connected back ground connection with voltage transformer (PT); be in series with high-tension fuse (RD) between the three-phase port of voltage transformer (PT) and the three-phase high-voltage isolating switch; the voltage transformer control end of microcomputer arc-suppressing controller (ZK) is connected with voltage transformer (PT); the vacuum contactor control end is connected with vacuum contactor (JZ); the three-phase port of high-voltage and current-limitation fuse (FU) connects three-phase high-voltage isolating switch respectively; another termination vacuum contactor (JZ); vacuum contactor (JZ) earth terminal ground connection is provided with zero sequence current mutual inductor (LH) between vacuum contactor (JZ) earth terminal and the earth point.

Images