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Intelligent power arrester

A power surge arrester and intelligent power supply technology, applied in the direction of resistors, instruments, electrical components, etc., can solve the problems of SPD spontaneous combustion, failure of varistor tripping, waste of resources, etc., achieve rapid and accurate tripping action, and prevent spontaneous combustion Danger, effect of preventing fire accidents

Inactive Publication Date: 2009-01-07
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This physical protection method has the following deficiencies: 1. Due to the thermal inertia of the terminal and low-temperature solder, the temperature rise of the terminal lags behind the temperature rise of the zinc oxide varistor, so the action speed is slow; 2. The spring lever mechanism has Due to mechanical inertia and design errors in the manufacturing process, improper torque matching is caused. Even if the temperature rise of the piezoresistor reaches the specified value after deterioration, the spring lever mechanism cannot pull the power terminal apart, resulting in frequent accidents of SPD spontaneous combustion; 3. After the zinc oxide varistor deteriorates, it will generate heat, and the temperature will rise, and the value of the temperature rise is related to the calorific value of the zinc oxide varistor, and also related to the ambient temperature, and the low-temperature solder is based on the fixed melting point of the metal mixture. In response to the deterioration of zinc oxide varistors under different conditions of use, this treatment is inaccurate, and it cannot be judged in time or accurately whether the lightning arrester has been damaged, and sometimes the tripping action will occur in advance, resulting in a waste of resources. On the other hand, the tripping action lags behind, and the degraded varistor cannot be tripped in time, causing the overvoltage protection to fail.
In short, physical protection methods are slow, less precise and less reliable

Method used

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Embodiment 1

[0022] Embodiment 1: Single-chip microcomputer implementation

[0023] The 80C52 single-chip microcomputer is used as the MCU, and the specific chip selected is W78LE516B of Winbond Company. This single-chip microcomputer chip integrates 64K programmable ROM, 4K auxiliary ROM, and 32K RAM. figure 2 It is the general system diagram of this embodiment, which describes the system design of the single-chip microcomputer embodiment.

[0024] like image 3 (Temperature sensor circuit diagram) shows that the power surge arrester facility is equipped with 4 zinc oxide varistor lightning protection modules, and 4 temperature sensors are required to monitor its temperature. The temperature sensor is embedded on the surface of the zinc oxide varistor of each module. It is drawn out through the lead wire and plugged into the control circuit board, that is, connected to the image 3 On the JP1 socket, the temperature sensor is connected in series with the 4.7K resistor, and the voltage ...

Embodiment 2

[0032] Embodiment 2: Advanced Reduced Instruction Machine (ARM) Implementation

[0033] ARM (Advanced RISC Machine: Advanced Reduction Machine) is a 32-bit embedded microcontroller. This embodiment selects the ARM9 chip STR912FW44×6 of STMicroelectronics (ST), which integrates 512KB+32KB Flash ROM and 96KB of SRAM, CPU main clock frequency of 96MHz (obtained from off-chip 25MHz clock on-chip frequency division), with 8-way analog-to-digital conversion on-chip, 80 I / O ports, and support LCD display, so it is suitable for measurement, and with enhanced functionality.

[0034] FIG. 9 is a general block diagram of the system, describing the system design of the ARM embodiment.

[0035] As shown in Figure 10 (CPU design diagram), P1 and P6 are used for LCD display output, P6.4_P6.7 is used for alarm and trip control signal output, P4 is configured as sensor signal input, P3 and P2 Part of the pins of the port are input by the matrix keyboard, and the 39 pins of the CPU are equipp...

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Abstract

The invention discloses a intelligent power source arrester, it is a trip protecting device with physical and intelligent method, it includes intelligentized embedded control system and temperature sensor, the temperature sensor is embedded into the surface of the zincite piezoresistance of the power source arrester, and insulated with the zincite piezoresistance, another temperature sensor is used to detect the temperature of entironment; the embedded CPU system can detect the parameters of power source arrester module on line, and break the poor power source arrester, the current mutual-inductor is in the trip device, it can feed back the drain current parameter of the piezoresistance to the CPU to realize the online detection of power source arrester, and judging whether the power source arrester is bad according to the set data. The cost of the invention is low, performance is reliable, the danger of self-ignite induced by bad power source arrester can be stopped, the action of trip is precise and quick, protection is in time.

Description

technical field [0001] The invention relates to a power surge arrester, in particular to a power surge arrester with intelligent tripping control. Background technique [0002] Power surge arrester (also known as power surge protector or surge protector, Surge Protective Device referred to as SPD). Ordinary power surge arresters are made of zinc oxide semiconductor varistors (Varistor). This traditional power surge arrester has a disadvantage. When it is subjected to strong lightning strikes or deteriorates due to long-term use, its leakage current increases, thus oxidizing The body of the zinc resistor will generate heat, and in serious cases, an arc will be generated to cause it to spontaneously ignite. If the arrester is not disconnected from the circuit in time, there is a danger of fire. Therefore, the failure protection of the arrester itself is an essential function of the arrester. The failure protection of varistors is the key and difficult point in the design and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04G01R27/00G01R27/02H01C13/02
Inventor 胡勇坚程小辉胡喜郑安兵
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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