CN2104453U - Lightning arrester resistance current detecting instrument - Google Patents
Lightning arrester resistance current detecting instrument Download PDFInfo
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- CN2104453U CN2104453U CN 90218717 CN90218717U CN2104453U CN 2104453 U CN2104453 U CN 2104453U CN 90218717 CN90218717 CN 90218717 CN 90218717 U CN90218717 U CN 90218717U CN 2104453 U CN2104453 U CN 2104453U
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- lightning arrester
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- detecting instrument
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Abstract
The utility model relates to a lightning arrester resistance current detecting instrument which can measure the peak value and the effective value of the total current of the loop, the peak value and the effective value of the resistive current, the active loss and the AC voltage, and is supplied with the interface of the oscilloscope. The design principle uses the valve sheet resistance of the discharge counter and the voltage at both ends to carry out tracking calculation. The detecting instrument is directly connected in parallel with both ends of the discharge counter when measurement. As a result, the utility model has the advantages of convenient operation, high safety, and high precision by +-2.5%. So the utility model is an ideal detecting instrument for the various forms lightning arrester with live testing in electric power system.
Description
The utility model is the instrumentation that the lightning arrester in the Operation of Electric Systems is carried out charged detection; by Ministry of Energy's regulation; zinc paste (MOA) lightning arrester its loop current value of periodic measurement that must be in operation; the normal loop of operating lightning arrester total current value is tens to several thousand microamperes, and existing measurement instrument and method of testing are following several:
1, disconnection arrester ground end seals in the interchange microampere meter and measures loop current value, and this method is the most accurate, but extremely dangerous and very inconvenience.
2, the lightning arrester end be in series with the discharge counter used of record discharge time (by a non-linear valve block resistance and some with measure irrelevant parts and constitute, it is interior to be loaded on an airtight container).Domesticly generally adopt the extremely low interchange microampere meter of internal resistance (internal resistance is about tens ohm, as MF-20 type multimeter), the two ends that are connected in parallel on the discharge register constitute measuring shunt to the lightning arrester loop current with it, the shortcoming of this measuring method is: the non-linear valve block resistance in the discharge register, make moist or during temperature variation, change in resistance is bigger, makes the branch flow valuve of being surveyed can not correctly reflect the variation of lightning arrester loop current value.
3, Japanese tester is made the LCD-4 type leakage current detector of being produced, and can measure lightning arrester loop total current effective value, the current in resistance property peak value, and three parameters of active loss, and have the oscillograph interface.The measuring method of electric current is to adopt split core type current transformer (pincerlike CT) with the current signal of microampere order, becomes a voltage signal input media that is directly proportional with it and measures.Domestic literature is pointed out, the LCD-4 leakage current detector is easy to use, be to carry out the comparatively ideal instrument of Zinc-Oxide Arrester live testing at present, its key problem in technology is that highly sensitive AC current-voltage (i/u) is changed pincerlike CT, the key technical indexes is the measuring accuracy of total current effective value, composition error is ± 7.5%, and price is higher.
Task of the present utility model provides a kind of pinpoint accuracy, easy to use, safety, the multi-functional arrester resistance current detector of low price, can measure loop total current effective value, the total current peak value, current in resistance property effective value, current in resistance property peak value, active loss, six parameters such as alternating voltage, and have the oscillograph interface function, electronic circuitry design all adopts integrated operational amplifier IC.
Design concept of the present utility model is different with traditional shunting summation current transformer method, it is to adopt interior non-linear valve block resistance of discharge counter and both end voltage to carry out following calculation to realize that the lightning arrester loop exchanges circuital measurement, the same two ends that are connected in parallel on discharge counter easily with shunting during test, what record is to seal in identical loop total current value rather than the branch flow valuve of table mensuration with disconnecting the arrester ground end, and test result is not influenced by interior any of non-linear valve block resistance states of discharge counter.
The key technical indexes of the present utility model is: the measuring accuracy composition error of loop total current effective value is ± 2.5%, because it has avoided adopting highly sensitive AC current-voltage (i/u) to change pincerlike CT, thereby its sampled signal is undistorted, there are not no-load voltage ratio that pincerlike CT brings and angular error and CT to three, five, seven times .... the amplification of harmonic wave, and the influence of external magnetic field interference, thereby can accomplish that volume is little, low in energy consumption, the precision height, price is low.
Principle of work of the present utility model is described as follows with accompanying drawing 1: (measuring process with the current in resistance property peak value is an example)
When K1 at peak, K2 is in the I position, the alternating current voltage signal U1 that non-linear valve block resistance two ends produce in the discharge register in lightning arrester loop includes capacitive and resistive two components, isolate after precise rectification circuit is obtained negative half-wave voltage U1 ', voltage transformer (VT) (PT) secondary voltage is 100/
Volt ± 10%, take out U2 through electric resistance partial pressure, by phase-shift circuit the phase place of U2 is carried out the leading phase shift of 90 degree, become U2 ', the capacitive component same-phase among it and the U1, with U2 ' through precise rectification circuit obtain negative half-wave voltage U2 " (U1 ' in capacitive component and U2 " same-phase, the capacitive component that and U1 ' is much smaller than U2 "); carry out U1 '-U2 through subtracter " computing, operation result are resistive components for what occur at negative half-wave, and in the positive half-wave appearance is to subtract surplus U2 ".Precise rectification circuit behind the subtracter and peak value circuit are used for leaching the capacitive component (filtering positive half-wave) in the operation result, and obtain resistive component peak value (negative half-wave) among the U1 ', with the non-linear valve block resistance in this resistive component peak value and the discharge counter as known parameters, carry out following calculation by the following calculation circuit, try to achieve the current in resistance property peak value in lightning arrester loop.
In the measuring process of above-mentioned current in resistance property peak value, at active position, K2 is in the I position as K1, and the following calculation circuit will be tried to achieve the current in resistance property effective value in lightning arrester loop.
In the measuring process of above-mentioned current in resistance property peak value, make U2=0, k1 is at peak, and k2 is in the I position, and what following calculation was tried to achieve is loop total current peak value.
Work as U2=0, K1 is at active position, and K2 is in the I position, and what following calculation was tried to achieve is loop total current effective value.
When K2 in the P position, K1 is when active position, current in resistance property effective value and U2 effective value will calculate the active loss of lightning arrester by multiplier.
As K2 during in the U position, what measure is the effective value of U2.
Display is the magneto-electric table, and above-mentioned amount all carries out scale with voltage system, follows the tracks of the principle that compensating circuit has been used electronic inductance, and the interchange input impedance of following calculation circuit is improved.The effect of follow circuit is to provide an interface that shows current waveform for oscillograph.
Embodiment of the present utility model further is described as follows with accompanying drawing 2:
Integrated operational amplifier IC1(LM316) constitutes input isolation circuit, IC2(UPC153A) constitute precise rectification circuit, IC11(LM316) and C1, R1 constitutes the leading phase-shift circuit IC12(UPC153A of 90 degree) the formation precise rectification circuit, IC13(LM741) constitute fast electric-wave filter, voltage is sent into multiplier and display, IC3(LM741) constitute subtracter, IC4(UPC153A) and IC5(TL080) constitute and leach the capacitive component among the U1 ' and obtain wherein resistive component peak value or true rms circuit.T1(3DJ6) and IC10(LF356) constitute the active loss that multiplier is used to calculate lightning arrester, IC6(LM741) constitute the oscillograph interface circuit, the raising that the following calculation circuit exchanges input impedance is to adopt integrated operational amplifier IC7(UPC153A) and resistance R, Rf1, Rf2 realizes, multi-functional arrester resistance current detector adopts non-linear valve block resistance R z and the two integrated operational amplifier IC8(CA3130 in the discharge counter), IC9(LM741) following calculation of realization lightning arrester loop current, for IC8 result of calculation Ua=Uo(＜Rf1+Rf2 〉/Rz+1) is arranged, wherein Uo is the output voltage of IC5, Rz is the non-linear valve block resistance in the discharge counter, make constant K=Rf1+Rf2, for IC9 the Uo/Rz=K*Uo/Rz of result of calculation Ua '=(Rf1+Rf2) is arranged, this Ua ' is directly proportional with the lightning arrester loop current, in this process, increase or reduce as Rz, corresponding U1 and Uo also will increase or reduce, because of the lightning arrester loop resistance very big, can be considered constant current source, so the variation of Rz can not change the lightning arrester loop current value, thereby the Ua ' among Ua '=K*Uo/Rz is constant, has promptly realized the following calculation of loop current.
Claims (1)
1, one by main circuit board, integrated operational amplifier, function key, the multi-functional arrester resistance current detector that display is formed, it is characterized in that adopting integrated operational amplifier IC1 (LM316) to constitute buffer circuit, IC2 (UPC153A) constitutes precise rectification circuit IC3 (LM741) and constitutes subtracter, and IC4 (UPC135A) output connects the anode or the negative terminal of IC5 (TL080) input respectively, constitute effective value, peak value is selected.R
zConnect the lightning arrester end to R, Rf1, Rf1 connects with Rf2, and IC7 (UPC153A) output connects between Rf1 and the Rf2, and the R other end is connected to IC8 (CA313U), and IC8 output meets IC9 (LM741), constitutes the following calculation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90218717 CN2104453U (en) | 1990-08-28 | 1990-08-28 | Lightning arrester resistance current detecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90218717 CN2104453U (en) | 1990-08-28 | 1990-08-28 | Lightning arrester resistance current detecting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2104453U true CN2104453U (en) | 1992-05-13 |
Family
ID=4897485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90218717 Granted CN2104453U (en) | 1990-08-28 | 1990-08-28 | Lightning arrester resistance current detecting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2104453U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036804C (en) * | 1993-11-10 | 1997-12-24 | 江苏省电力试验研究所 | Lightning arrester leakance detecting and action recorder |
| CN1297821C (en) * | 2004-09-24 | 2007-01-31 | 西安交通大学 | Intelligent pulse current multiple parameter digital measurer based on non-linear resistance sheet |
| CN100460883C (en) * | 2004-12-29 | 2009-02-11 | 上海电气自动化设计研究所有限公司 | Detection method for testing current in resistance property of lightning arrester |
| CN1892240B (en) * | 2005-07-08 | 2011-03-16 | 上海市电力公司 | On-line monitoring method for dissipative current value in leakage current of lightning protector |
| CN102279298A (en) * | 2011-06-28 | 2011-12-14 | 北京电子工程总体研究所 | Oscilloscope provided with switching isolation module |
| CN102608409A (en) * | 2012-04-01 | 2012-07-25 | 江西省电力科学研究院 | Digital compensation method for measuring resistive current of MOA (metal oxide arrester) |
| CN102928646A (en) * | 2012-10-24 | 2013-02-13 | 合肥溢鑫电力科技有限公司 | Voltage sensor taking zinc oxide resistor as voltage divider, and application thereof |
| CN104280582A (en) * | 2014-10-23 | 2015-01-14 | 国家电网公司 | Resistive current correction method, connector and resistive current tester |
| CN104820127A (en) * | 2015-05-20 | 2015-08-05 | 南京信息工程大学 | Metal oxide arrester resistance current extracting method and device |
-
1990
- 1990-08-28 CN CN 90218717 patent/CN2104453U/en active Granted
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036804C (en) * | 1993-11-10 | 1997-12-24 | 江苏省电力试验研究所 | Lightning arrester leakance detecting and action recorder |
| CN1297821C (en) * | 2004-09-24 | 2007-01-31 | 西安交通大学 | Intelligent pulse current multiple parameter digital measurer based on non-linear resistance sheet |
| CN100460883C (en) * | 2004-12-29 | 2009-02-11 | 上海电气自动化设计研究所有限公司 | Detection method for testing current in resistance property of lightning arrester |
| CN1892240B (en) * | 2005-07-08 | 2011-03-16 | 上海市电力公司 | On-line monitoring method for dissipative current value in leakage current of lightning protector |
| CN102279298A (en) * | 2011-06-28 | 2011-12-14 | 北京电子工程总体研究所 | Oscilloscope provided with switching isolation module |
| CN102608409A (en) * | 2012-04-01 | 2012-07-25 | 江西省电力科学研究院 | Digital compensation method for measuring resistive current of MOA (metal oxide arrester) |
| CN102928646A (en) * | 2012-10-24 | 2013-02-13 | 合肥溢鑫电力科技有限公司 | Voltage sensor taking zinc oxide resistor as voltage divider, and application thereof |
| CN104280582A (en) * | 2014-10-23 | 2015-01-14 | 国家电网公司 | Resistive current correction method, connector and resistive current tester |
| CN104280582B (en) * | 2014-10-23 | 2017-12-19 | 国家电网公司 | A kind of current in resistance property antidote, rectifier and testing current in resistance property instrument |
| CN104820127A (en) * | 2015-05-20 | 2015-08-05 | 南京信息工程大学 | Metal oxide arrester resistance current extracting method and device |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |