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Resistance card for direct-current lightning arrester and production process thereof

A technology for resistors and lightning arresters, applied in varistors, varistor cores, etc., can solve the problems of poor electrical properties of zinc oxide resistors, square wave current capacity, complicated manufacturing process, and increased manufacturing costs. , to achieve uniform and stable internal structure, excellent aging performance, and improved thermal conductivity

Active Publication Date: 2013-09-11
NANYANG JINGUAN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Complicates the manufacturing process, and the heat treatment requires a lot of energy, which increases the manufacturing cost
The Chinese patent application number is CN101503292A "DC Zinc Oxide Resistor Formula" discloses the DC Zinc Oxide Resistor formula, but the formula contains Cr2O3 and SiO2, where Cr2O3 is toxic, SiO2 will react with ZnO to produce zinc silicate, because The thermal conductivity of zinc silicate is lower than that of ZnO, so the addition of SiO2 makes the electrical properties of zinc oxide resistors, especially the square wave current capacity, worse
Therefore, this technology is difficult to popularize. At present, the traditional process of coating bismuth oxide slurry on both ends of the resistor and then heat treatment at a temperature above 900°C is still commonly used in the process.

Method used

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  • Resistance card for direct-current lightning arrester and production process thereof
  • Resistance card for direct-current lightning arrester and production process thereof
  • Resistance card for direct-current lightning arrester and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The resistor sheet for the DC arrester of the present embodiment is made of the following raw materials in weight percent: Bi 2 o 3 : 4.0%; Sb 2 o 3 : 4.0%; 2 o 3 : 1.0%; MnCO 3 : 0.50%; NiO: 0.80%; ZrO 2 : 0.1%; Al(NO 3 ) 3 : 0.03%; B 2 o 3 : 0.10%; binder 0.6%; dispersant 0.3% and defoamer 0.1%; the balance is mainly ZnO.

[0030] Its production process is to carry out according to the following steps:

[0031] The first step, material preparation: weigh Bi respectively according to the proportion 2 o 3 , Sb 2 o 3 、 Co 2 o 3 , MnCO 3 , NiO, ZrO 2 , Al(NO 3 ) 3 , B 2 o 3 , binder, dispersant, defoamer and ZnO, the Bi 2 o 3 , Sb 2 o 3 、 Co 2 o 3 , MnCO 3 , NiO, ZrO 2 and B 2 o 3 After mixing and calcining in a calciner, send it into a ball mill and grind it to a particle size of ≤1 μm to make a mixed powder. The calcining temperature is 750°C and the calcining time is 0.5 hours; at the same time, Al(NO3)3 is added with water Al(NO 3 ) ...

Embodiment 2

[0043] The resistor sheet for the DC arrester of the present embodiment is made of the following raw materials in weight percent: Bi 2 o 3 : 5.0%; Sb 2 o 3 : 5.0%; 2 o 3 : 1.5%; MnCO 3 : 1.0%; NiO: 1.60%; ZrO 2 : 0.5%; Al(NO 3 ) 3 : 0.05%; B 2 o 3 : 0.16%; binder 0.9%; dispersant 0.6% and defoamer 0.3%; the balance is mainly ZnO.

[0044] Its production process is basically the same as Example 1, the difference is only in:

[0045] In the first step, the calcination temperature is 800°C, and the calcination time is 0.8 hours;

[0046] In the second step, in the granulation process, the weight percentage of the mixed powder contained in the prepared slurry is controlled at 67%, and the particle size of the granulated material is 90 μm;

[0047] In the third step, the control value of the moisture content by weight in the wet material is 1.25%, and the aging time is 18 hours;

[0048] In the fourth step, the debinding temperature is 450°C, the debinding time is 3 ho...

Embodiment 3

[0055] The resistor sheet for the DC arrester of the present embodiment is made of the following raw materials in weight percent: Bi 2 o 3 : 6.0%; Sb 2 o 3 : 6.0%; 2 o3 : 2.0%; MnCO 3 : 1.50%; NiO: 2.00%; ZrO 2 : 1.0%; Al(NO 3 ) 3 : 0.06%; B 2 o 3 : 0.20%; binder 1.2%; dispersant 0.9% and defoamer 0.4%; the balance is mainly ZnO.

[0056] Its production process is basically the same as Example 1, the difference is only in:

[0057] In the first step, the calcination temperature is 850°C, and the calcination time is 1 hour;

[0058] In the second step, in the granulation process, the weight percentage of the mixed powder in the prepared slurry is controlled at 70%, and the particle size of the granulated material is 120 μm;

[0059] In the third step, the control value of the moisture content by weight in the wet material is 1.5%, and the aging time is 24 hours;

[0060] In the fourth step, the debinding temperature is 500°C, the debinding time is 4 hours, the pre-b...

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Abstract

The invention discloses a resistance card for a direct-current lightning arrester, which is made of twelve raw materials, namely Bi2O3, Sb2O3, Co2O3, MnCO3, NiO, ZrO2, Al(NO3)3, B2O3, a binding agent, a dispersing agent, a defoaming agent and ZnO. The resistance card adopts a novel formula system and a novel production process; elemental compositions which are added are less; the process is simple; the cost is low; the internal structure of the resistance card is more stable and uniform, thereby greatly improving various performances of age resistance, the stability of current surge, thermal conductivity, square wave through-flow capacity and the like; the requirements of various direct-current lightning arresters can be met completely; the various direct-current lightning arresters can be achieved to be universal; an alternating-current lightning arrester and the direct-current lightning arrester are achieved to be universal; the capacity is large; the pressure ratio is small; the allowable chargeability is high; and the resistance card for the direct-current lightning arrester has an enough safety margin.

Description

technical field [0001] The invention belongs to the technical field of lightning arresters for power systems, and relates to a resistance sheet for a DC lightning arrester and a production process thereof. Background technique [0002] Compared with AC transmission, DC transmission has many advantages, such as large transmission capacity, smaller transmission corridor space, connection of different frequency AC systems, etc., especially in long-distance transmission projects greater than 800km, it has good technology economic benefit ratio. However, there are still many unresolved problems in DC transmission, especially in DC transmission projects. DC metal oxide resistors are the core components of high-voltage DC arresters and are crucial to the development and production of resistors. Different from AC surge arresters, there are many types of DC surge arresters. The main difference between various DC surge arresters is the applied voltage or continuous operating voltage....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/112C04B35/453C04B35/622
Inventor 王兰义赵冬一胡淑慧徐学亭刘明新
Owner NANYANG JINGUAN ELECTRIC
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