CN1158487A - Explosion-proof feeding switch over-current adjusting method and its device - Google Patents
Explosion-proof feeding switch over-current adjusting method and its device Download PDFInfo
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- CN1158487A CN1158487A CN 96102417 CN96102417A CN1158487A CN 1158487 A CN1158487 A CN 1158487A CN 96102417 CN96102417 CN 96102417 CN 96102417 A CN96102417 A CN 96102417A CN 1158487 A CN1158487 A CN 1158487A
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Abstract
An over-current regulation method for flame-proof power switch is used in over-current regulation and test of power supply and over-current protecting relay, as well as in calibration of electric meter, mutual current inductor and tong-test meter. The primary winding of ring autotransformer is used as regulating terminal. The number of turns for the primary winding is changed by carbon brush. Its secondary winding only has serveral turns of thick cable. Said primary and secondary windings constitute an adjustable high-current generator. A zero-cross comparator, monostable circuit and rectifying filter are used to control the clock oscillating terminal of A/D converter in digital current meter. Its advantages include high correctness, simple structure, small size and wide adaptability.
Description
The invention belongs to electric prospection, test the equipment of adjusting, be widely used in feeding switch and other overcurrent protection relay are done over-current adjusting, overcurrent test, also can be used for the verification of electrician's ammeter commonly used, current transformer, pincerlike meter etc.
At present, traditional over-current adjusting device by voltage regulator, produce the generator of big electric current and measure the current transformer that shows usefulness, ammeter etc. and form, need two iron cores to make, produce adjustable voltage from the lotus root voltage regulator, the generator that produces big electric current becomes low-voltage and high-current with adjustable voltage transitions.The equipment utilization controllable silicon high power module that has is again made voltage regulator, because the voltage waveform distortion of controllable silicon output is serious, needs very big radiator, is difficult to reduce volume, reduces weight.Controllable silicon overcurrent-overvoltage ability is relatively poor, fragile simultaneously.
In the low-voltage power supply system of China's coal-mine down-hole, feeding switch adopts DW80 series feeding switch in a large number, the overcurrent release that prevents supply line's short circuit is arranged in this switch, and by " safety regulations in coal mine " regulation, this switch should often be adjusted, adjust and verification.The equipment of adjusting of feeding switch over-current release, show that instruments such as the current transformer of usefulness and ammeter form if need strong current generator, voltage regulator, measurement with traditional approach, these powerful devices volume that combines is very big, operating personnel are very careful, are difficult to make the flame-proof type equipment that is fit to environmental condition use under the coal mine.Have to move feeding switch to ground, after the spring mechanism of the overcurrent release of switch is adjusted with testing equipment, move the down-hole again to and use.In carrying, the impact shock during the spring of originally adjusting tends to be carried is out of shape like this, and influences the production efficiency in colliery.
Purpose of the present invention is exactly a kind of feeding switch over-current adjusting method and the device thereof that will provide easy to operate, accurate, simple in structure.
Feeding switch over-current adjusting method of the present invention and device thereof, develop a kind of adjustable strong current generator exactly, utilize annular to hold as adjusting from the former limit of lotus root voltage regulator, adopt carbon brush to change the former limit number of turn, a section of annular core, as paying the limit, make the adjustable great current generator with big cable winding number circle; Utilize zero passage comparison circuit, monostable circuit and current rectifying and wave filtering circuit to come the clock oscillation end of A/D converter in the control figure ammeter again, constitute the ammeter of measuring big electric current.
The distinguishing feature that the present invention has is:
1, only be developed into the adjustable great current generator with an iron core, under the situation that input voltage is constant on former limit, pair limit load resistance is constant, by changing the former limit number of turn, paying a limit electric current can change thereupon.
2, the ammeter of the big electric current of measurement has automatic memory function, the current value when making tested switch can remember tripping operation automatically when tripping operation.
3, adopt explosion-resistant enclosure as preventive means.
4, simple in structure, volume is little, in light weight, easy to operate accurately, not influenced by external environmental condition.
Description of drawings:
Fig. 1 is a surface structure schematic diagram of the present invention
Fig. 2 is an electrical schematic diagram of the present invention
Fig. 3 is a current measurement circuit schematic diagram of the present invention
Below in conjunction with accompanying drawing the present invention is described in further detail.
Feeding switch over-current adjusting method of the present invention is to utilize annular to transform from the lotus root voltage regulator, and former limit adopts carbon brush to change the former limit number of turn as adjusting end, in a section of annular core be carbon brush transfer less than the position, with big cable around three circles as a pair limit.Under the constant situation of former limit input voltage, change the size of paying the limit output current with the method that changes the former limit number of turn, voltage regulator and strong current generator are become one, make the adjustable great current generator with an iron core.
This device is the rectangle wire connection cavity from seeing the top in appearance, is used for lead-in cable and draws the output current cable, and the wire connection cavity below is cylindrical, and inside mainly contains adjustable great current generator, ammeter, fine tuning selector switch and control protector etc.Be respectively input cable port 1, output cable mouth 2, display window 3, up-flow swing handle 4 and fine tuning selector switch 5 as shown in Figure 1.
As shown in Figure 3, this device provides 127 volts of power supplys by prime equipment (as lighting switch), by control transformer TC, for contactor KM, protection plug-in unit FS and ammeter PA provide power supply.Feeding switch JK is connect M and X1 shelves (paying a limit is 1 circle, and output 600A is following) or M and X3 shelves, and (to pay a limit be 3 circles, export 600～1200A), and the SA selector switch connects 2 grades or 3 grades.This moment, the adjustment end T of adjustable great current generator TM was in the min position, at this moment made position switch SQ not closed by mechanical mechanism, and the FS relay is not closed; contactor KM is not closed; be that the TM no-voltage does not have big electric current output, wherein RT is a thermistor, and TM is played superheat protecting function.
When the adjustment end T of adjustable great current generator TM when max moves, position switch SQ, relay FS, contactor KM are closed, adjustable great current generator TM gets electric, exports big electric current.Adjustment end T moves to max gradually, and electric current constantly increases, when electric current arrives to a certain degree greatly, and external tested switch JK tripping operation, pair limit of TM may form the loop, i.e. no current output, ammeter PA will show tested switch JK trip value.At this moment testing crew can compare with tested switch calibration value according to the ammeter indication, adjusts tested switch setting value.
In digital ammeter, the clock oscillation end K of A/D converter connects the current measurement circuit of being made up of zero passage comparison circuit BG3-1, monostable circuit BG3-2, BG3-3 and current rectifying and wave filtering circuit with memory function.Be about to the output of zero passage comparison circuit BG3-1, the input of order steady-state circuit BG3-2, the input of the output termination current rectifying and wave filtering circuit BG3-3 of monostable circuit, the output of current rectifying and wave filtering circuit remove the clock oscillation end K of A/D converter in the control figure ammeter.BG3-1 zero passage comparison circuit, power supply have just had electricity and when not having big electric current, R
1No-voltage, output low level, "+" terminal potential height of monostable circuit BG3-2, the output high level passes through resistance R
15To capacitor C
6Charging, this moment, BG3-3 "+" terminal potential height was exported high level, and K is a high level, and the gauge outfit locking is through capacitor C after 10 seconds
6"+" end is lower than "-" end when being charged to certain voltage, BG3-3 output low level D
16Not conducting, the digital watch clock oscillation, the gauge outfit operate as normal is carried out to measure and is prepared.
During measurement, current transformer TA has current signal, by by BG2 and D
7, D
8, R
10, R
12The accurate amplifier rectification circuit that constitutes, and TY-43 digital ammeter gauge outfit shows current value.When adjusting strong current generator and make electric current constantly increase to switch trip, at this moment TA does not have current signal, because the BG3-1 output low level, and the instantaneous output high level of BG3-2, BG3-3 at this moment, D
10The output high level, K is a high level, makes the clock failure of oscillations in the digital watch, register keeps the preceding value of legacy data display switch tripping operation (because voltage signal has C
8Filtering, and the A/D conversion speed is slow, so at D
10Can keep legacy data during for high level), will finish memory function like this.Pass through R again
15To C
6After charging a period of time, the BG3-3 output low level finishes memory function then automatically.
Claims (1)
1, a kind of explosion-proof feeding switch over-current adjusting method and device thereof is characterized in that:
1) annular is held as adjusting from the former limit of lotus root voltage regulator, adopt carbon brush to change the former limit number of turn,, as paying a limit, make the adjustable great current generator with big cable winding number circle at one section of annular core;
2) utilize zero passage comparison circuit output, the input of order steady-state circuit, again its output is connect the input of current rectifying and wave filtering circuit, make the clock oscillation end of the interior A/D converter of output control figure ammeter of current rectifying and wave filtering circuit, constitute the ammeter of measuring big electric current;
3) its shell is the flame-proof type shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96102417 CN1054230C (en) | 1996-02-27 | 1996-02-27 | Explosion-proof feeding switch over-current adjusting method and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96102417 CN1054230C (en) | 1996-02-27 | 1996-02-27 | Explosion-proof feeding switch over-current adjusting method and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1158487A true CN1158487A (en) | 1997-09-03 |
| CN1054230C CN1054230C (en) | 2000-07-05 |
Family
ID=5117544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96102417 Expired - Fee Related CN1054230C (en) | 1996-02-27 | 1996-02-27 | Explosion-proof feeding switch over-current adjusting method and its device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1054230C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752146B (en) * | 2008-12-02 | 2013-09-11 | 施耐德电器工业公司 | Method for improving stability of setting currents of electromagnetic trips of miniature circuit breaker |
-
1996
- 1996-02-27 CN CN 96102417 patent/CN1054230C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752146B (en) * | 2008-12-02 | 2013-09-11 | 施耐德电器工业公司 | Method for improving stability of setting currents of electromagnetic trips of miniature circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1054230C (en) | 2000-07-05 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |