CN1719264A - Contact resistance, contact power consumption on line detection and short message alarming device - Google Patents
Contact resistance, contact power consumption on line detection and short message alarming device Download PDFInfo
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- CN1719264A CN1719264A CN 200410052645 CN200410052645A CN1719264A CN 1719264 A CN1719264 A CN 1719264A CN 200410052645 CN200410052645 CN 200410052645 CN 200410052645 A CN200410052645 A CN 200410052645A CN 1719264 A CN1719264 A CN 1719264A
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- contact resistance
- signal
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- switch
- power consumption
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Abstract
The present invention provides a switching contact resistance and contact power dissipation on-line detection and short message alarm equipment. Said equipment includes the following components: actuating signal generator, switch, amplifier, bandpass filter, multichannel selector switch, voltage detection circuit, central processor and current detection circuit.
Description
Technical field
The present invention relates to a kind of electric switch contact resistance, contact power consumption online measuring technique and out-of-limit automatic transmission SMS alarm device.
Background technology
At present, domestic and international still unmatchful electric switch contact resistance or the contact power consumption warning device that carries out online detection is not also with the electric switch or the electric switch fault detect dispensing device of note sending function.
The contact resistance of electric switch is the important parameter of reflection electric switch serviceability, and the electric switch contact resistance increases and causes electric switch overheated and to burn out be recurrent situation.
Summary of the invention
Technical matters to be solved by this invention provide a kind of can online detection electric switch contact resistance with contact power consumption, when these parameters surpass normal value, can report to the police, excise automatically some less important loads automatically, and send the device of short message alarm automatically.
In order to solve the problems of the technologies described above, the present invention has adopted following technical proposals: the noise of testing circuit comprises two kinds: a kind of is industrial frequency noise, and this noise is an overriding noise, and another kind is the noise of testing circuit itself, mainly is resistance noise, amplifier noise.At industrial frequency noise: adopt high frequency pumping, because signal frequency and work frequency differ greatly, so industrial frequency noise can filter with wave filter.At the testing circuit noise, because the testing circuit noise is made up of with the noise relevant with exciting signal frequency white noise, establishing the testing circuit enlargement factor is K
1, pumping signal is high-frequency constant current source signal I, and the electric switch contact resistance is R, and exciting current all flows through contact resistance R, and then electric switch contact resistance both end voltage is
V
iIt is V that=IR (1) establishes the testing circuit white noise again
In vain, the noise close with exciting signal frequency is V
S, industrial frequency noise is V
The worker, then testing circuit is output as
V
0=K (IR+V
In vain+ V
S+ V
The worker) (2) wherein since testing circuit be input as high-pass filtering, to V
The workerNoise, input impedance is very little, and testing circuit each the level bandpass filtering is all arranged, therefore, V
The workerNoise is attenuated in testing circuit all the time, and near the signal beyond simultaneously exciting signal frequency is decayed equally all the time, so testing circuit is actual is output as:
V
0=K (IR+V
S) V in (3) formula
SBe near the noise the exciting signal frequency, only relevant, and irrelevant with its spoke value with exciting signal frequency, make that excitation signal amplitude is variable, therefore, when pumping signal spoke value is I ',
Then
Promptly
Because V
0, V
0' be measured value, K, I, I ' they are given values, then can detect contact resistance R, and R and measurement noise are irrelevant.
Testing circuit constitutes the high-pass filtering network with many low capacity high-voltage capacitors and resistance, reach the purpose of decay power frequency component, play isolated high-voltage simultaneously, limit the purpose that high-voltage leakage current is lower than safety current, even adopting another purpose of many high-voltage capacitances is that individual capacitors is broken down by high-voltage, can not cause leakage current to increase to more than the safety current yet.
Since the contact resistance scope very big from the micro-ohm level to tens milliohm levels, so the enlargement factor of amplifying circuit is capable of automatic changing, when contact resistance surpasses certain value, sends alerting signal.
Contact resistance consumption detection: flow through the power current I of electric switch by detection, can calculate the contact resistance power consumption and be
P=I
2When R (7) surpasses certain value when the contact resistance power consumption, after time-delay, send alerting signal and the less important load signal of excision.
Note sends automatically: this slowdown monitoring circuit is connected with mobile module through interface circuit, thereby alerting signal is sent on the relevant mobile phone with the note form by mobile module.
In sum, switch contact resistance contact online detection of power consumption of the present invention and short message alarm device comprise:
One pumping signal generation device, it produces a pumping signal and the exciting current amplitude is made periodically alternate;
One switch, described pumping signal generation device and contact resistance detection signal all are connected on this switch ends;
Some grades of amplifiers and bandpass filter, described amplifier amplifies described pumping signal, described bandpass filter; Near beyond the filtering decay exciting signal frequency noise signal;
Multidiameter option switch carries out enlargement factor and selects, and output contains contact resistance signal and near the noise signal in addition of excitation frequency;
Voltage detecting circuit, its signal according to multidiameter option switch output obtains corresponding contact resistance magnitude of voltage.
Central processing unit is selected enlargement factor automatically according to the size of detection signal, and receives exciting current luffing synchronizing signal;
Current detection circuit, its electric current that detects electric switch is worth accordingly, and inputs to central processing unit;
Described central processing unit can obtain contact resistance numerical value according to different constant current source amplitudes and above-mentioned contact resistance calculated signals; The current value that described central processing unit can also record according to current detection circuit calculates the contact resistance power consumption, when described contact resistance data or contact resistance power consumption exceed predetermined value, then sends an alerting signal;
Mobile module, it is connected with central processing unit through interface circuit, and receives described alerting signal.
Owing to adopted technique scheme, the present invention can online detection electric switch contact resistance with contact power consumption, when these parameters surpass normal value, report to the police, excise automatically some less important loads automatically, and send short message alarm automatically, thereby avoid or reduce loss of outage.
Description of drawings
Fig. 1 is that electric switch contact resistance, the online detection of power consumption, warning and note send theory diagram.
Embodiment
When reality realizes, by measuring many class values, and then use software filtering, the result precision that records like this is higher.
As shown in Figure 1: described switch contact resistance contact online detection of power consumption and short message alarm device comprise:
One pumping signal generation device 1, it produces a pumping signal and the exciting current amplitude is made periodically alternate;
One switch 2, described pumping signal generation device and contact resistance detection signal all are connected on this switch ends;
Some grades of amplifiers and bandpass filter 3, described amplifier amplifies described pumping signal, described bandpass filter; Near beyond the filtering decay exciting signal frequency noise signal;
Multidiameter option switch 4 carries out enlargement factor and selects, and output contains contact resistance signal and near the noise signal in addition of excitation frequency;
Voltage detecting circuit 5, its signal according to multidiameter option switch output obtains corresponding contact resistance magnitude of voltage.
Central processing unit 6 is selected enlargement factor automatically according to the size of detection signal, and receives exciting current luffing synchronizing signal;
Current detection circuit 7, its electric current that detects electric switch is worth accordingly, and inputs to central processing unit;
Described central processing unit 6 can obtain contact resistance numerical value according to different constant current source amplitudes and above-mentioned contact resistance calculated signals; The current value that described central processing unit can also record according to current detection circuit calculates the contact resistance power consumption, when described contact resistance data or contact resistance power consumption exceed predetermined value, then sends an alerting signal;
Mobile module 8, it is connected with central processing unit through interface circuit, and receives described alerting signal.
Wherein, described voltage detecting circuit 5 comprises: absolute value circuit 51, filtering circuit 52, A/D converter 53, described detection signal obtains containing near the direct current signal of the noise signal contact resistance signal and the excitation frequency through described absolute value circuit, filtering circuit after amplifying, and obtain counting accordingly after the A/D converter conversion;
Described current detection circuit 7 comprises: current transformer 71, power current testing circuit 72, A/D converter 53, described power switch current is delivered to power current testing circuit 72 through current transformer 71 and is become direct current signal and deliver to A/D converter 53, through A/D conversion becoming current value.
Described pumping signal generation device 1 is a high frequency luffing AC constant-current source.Described high frequency luffing AC constant-current source also comprises the high pass network 11 of an inside, and high frequency luffing AC constant-current source exciting current is that high pass network by inside is connected to switch ends.
Described high frequency luffing AC constant-current source generation pumping signal is added in the electric switch two ends and (has only drawn a utmost point of electric switch among the figure, other is extremely the same), the exciting current amplitude is made periodically alternate (I, I '), simultaneously, high frequency luffing AC constant-current source send exciting current luffing synchronizing signal to know existing constant current source output current size with notice CPU to central processing unit (CPU), for isolated high-voltage, high frequency luffing AC constant-current source exciting current is that the high pass network by inside is connected to switch ends.The switch contact resistance detection signal also is connected on switch ends (should in the inboard of pumping signal line), and detection signal is isolated through high pass network (isolated high-voltage, decay power frequency), with through some grades of amplifier (every grade of amplifying signal multiple K
1) and bandpass filter deliver to multidiameter option switch, carry out enlargement factor and select, near the noise signal beyond the bandpass filter filtering decay exciting signal frequency.CPU selects enlargement factor automatically according to the size of detection signal, selector switch output obtains containing near the direct current signal of the noise signal contact resistance signal and the excitation frequency after through the absolute value circuit that takes absolute value and filtering circuit, direct current signal obtains counting accordingly after the conversion of A/D car parallel operation, but the amplitude (passing through synchronizing signal) or the constant current source of CPU ACTIVE CONTROL constant current source independently change amplitude, and send synchronizing signal to CPU.CPU according to the data of constant current source amplitude and sampling by formula (6) calculate, obtain contact resistance R numerical value, CPU averages value filtering or gets medium filtering through the contact resistance value that connection is repeatedly recorded and finally obtains contact resistance value more accurately, the electric current of electric switch is delivered to the power current testing circuit through current transformer and is become direct current signal and deliver to A/D converter, through A/D conversion becoming current value, CPU calculates the contact resistance power consumption, CPU is according to the contact resistance and the power consumption thereof that record, compare with the setting limit value, whether decision reports to the police, whether excise less important load, whether send SMS alarm.
Claims (8)
1, a kind of switch contact resistance contact online detection of power consumption and short message alarm device is characterized in that, comprising:
One pumping signal generation device (1), it produces a pumping signal and the exciting current amplitude is made periodically alternate;
One switch (2), described pumping signal generation device and contact resistance detection signal all are connected on this switch ends;
Some grades of amplifiers and bandpass filter (3), described amplifier amplifies described pumping signal, described bandpass filter; Near beyond the filtering decay exciting signal frequency noise signal;
Multidiameter option switch (4) carries out enlargement factor and selects, and output contains contact resistance signal and near the noise signal in addition of excitation frequency;
Voltage detecting circuit (5), its signal according to multidiameter option switch output obtains corresponding contact resistance magnitude of voltage.
Central processing unit (6) is selected enlargement factor automatically according to the size of detection signal, and receives exciting current luffing synchronizing signal;
Current detection circuit (7), its electric current that detects electric switch is worth accordingly, and inputs to central processing unit;
Described central processing unit (6) can obtain contact resistance numerical value according to different constant current source amplitudes and above-mentioned contact resistance calculated signals; The current value that described central processing unit can also record according to current detection circuit calculates the contact resistance power consumption, when described contact resistance data or contact resistance power consumption exceed predetermined value, then sends an alerting signal;
Mobile module (8), it is connected with central processing unit through interface circuit, and receives described alerting signal.
2, switch contact resistance contact online detection of power consumption according to claim 1 and short message alarm device, it is characterized in that, described voltage detecting circuit (5) comprising: absolute value circuit (51), filtering circuit (52), A/D converter (53), described detection signal obtains containing near the direct current signal of the noise signal contact resistance signal and the excitation frequency through described absolute value circuit (51), filtering circuit (52) after amplifying, and obtain counting accordingly after the A/D converter conversion;
3, switch contact resistance contact online detection of power consumption according to claim 1 and short message alarm device, it is characterized in that, described current detection circuit (7) comprising: current transformer (71), power current testing circuit (72), A/D converter (53), described power switch current is delivered to the power current testing circuit through current transformer and is become direct current signal and deliver to A/D converter, through A/D conversion becoming current value.
4, switch contact resistance contact online detection of power consumption according to claim 1 and short message alarm device is characterized in that described pumping signal generation device (1) is a high frequency luffing AC constant-current source.
5, switch contact resistance contact online detection of power consumption according to claim 4 and short message alarm device, it is characterized in that, described high frequency luffing AC constant-current source also comprises the high pass network (11) of an inside, and high frequency luffing AC constant-current source exciting current is that high pass network by inside is connected to switch (2) two ends.
6, switch contact resistance contact online detection of power consumption according to claim 4 and short message alarm device, it is characterized in that described central processing unit (6) can average value filtering or get medium filtering and finally obtain contact resistance value more accurately the contact resistance value that connection repeatedly records.
7, switch contact resistance contact online detection of power consumption according to claim 4 and short message alarm device is characterized in that described high frequency luffing AC constant-current source (1) can initiatively produce the luffing constant current signal and send synchronizing signal to central processing unit (6).
8, switch contact resistance contact online detection of power consumption according to claim 1 and short message alarm device is characterized in that, described central processing unit (6) send synchronizing signal to change the constant current source amplitude to high frequency luffing AC constant-current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052645 CN1719264A (en) | 2004-07-08 | 2004-07-08 | Contact resistance, contact power consumption on line detection and short message alarming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052645 CN1719264A (en) | 2004-07-08 | 2004-07-08 | Contact resistance, contact power consumption on line detection and short message alarming device |
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| Publication Number | Publication Date |
|---|---|
| CN1719264A true CN1719264A (en) | 2006-01-11 |
Family
ID=35931152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410052645 Pending CN1719264A (en) | 2004-07-08 | 2004-07-08 | Contact resistance, contact power consumption on line detection and short message alarming device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833065A (en) * | 2010-03-19 | 2010-09-15 | 烟台鲁宝钢管有限责任公司 | Method for accurately measuring whether circuit resistance of high-pressure oil circuit breaker exceeds standard or not |
| CN103034100A (en) * | 2011-10-05 | 2013-04-10 | 株式会社理光 | Power supply control apparatus, image forming apparatus, and power supply control method |
| CN106501715A (en) * | 2016-12-14 | 2017-03-15 | 南京工业职业技术学院 | Harmony electric locomotive accessory fan control contactor contacts status monitoring device |
| CN108459205A (en) * | 2018-03-28 | 2018-08-28 | 合肥云智物联科技有限公司 | A kind of flow monitoring equipment based on power automatic system |
| CN108845251A (en) * | 2018-06-26 | 2018-11-20 | 国网黑龙江省电力有限公司绥化供电公司 | The GIS combination electric appliance comprehensive tester and test method of double-station disconnecting link |
| CN109683020A (en) * | 2018-12-24 | 2019-04-26 | 广东电网有限责任公司 | The device and method for calculating aerial earth wire and preformed armor rods contact port contact resistance |
-
2004
- 2004-07-08 CN CN 200410052645 patent/CN1719264A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101833065A (en) * | 2010-03-19 | 2010-09-15 | 烟台鲁宝钢管有限责任公司 | Method for accurately measuring whether circuit resistance of high-pressure oil circuit breaker exceeds standard or not |
| CN103034100A (en) * | 2011-10-05 | 2013-04-10 | 株式会社理光 | Power supply control apparatus, image forming apparatus, and power supply control method |
| CN106501715A (en) * | 2016-12-14 | 2017-03-15 | 南京工业职业技术学院 | Harmony electric locomotive accessory fan control contactor contacts status monitoring device |
| CN106501715B (en) * | 2016-12-14 | 2019-08-16 | 南京工业职业技术学院 | Harmony electric locomotive accessory fan control contactor contacts status monitoring device |
| CN108459205A (en) * | 2018-03-28 | 2018-08-28 | 合肥云智物联科技有限公司 | A kind of flow monitoring equipment based on power automatic system |
| CN108845251A (en) * | 2018-06-26 | 2018-11-20 | 国网黑龙江省电力有限公司绥化供电公司 | The GIS combination electric appliance comprehensive tester and test method of double-station disconnecting link |
| CN109683020A (en) * | 2018-12-24 | 2019-04-26 | 广东电网有限责任公司 | The device and method for calculating aerial earth wire and preformed armor rods contact port contact resistance |
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