CN202522677U - Quick measuring device for protective pressing plate - Google Patents
Quick measuring device for protective pressing plate Download PDFInfo
- Publication number
- CN202522677U CN202522677U CN201220017400XU CN201220017400U CN202522677U CN 202522677 U CN202522677 U CN 202522677U CN 201220017400X U CN201220017400X U CN 201220017400XU CN 201220017400 U CN201220017400 U CN 201220017400U CN 202522677 U CN202522677 U CN 202522677U
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- resistance
- pressing plate
- resistor
- operational amplifier
- protection pressing
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Abstract
The utility model discloses a quick measuring device for a protective pressing plate. The quick measuring device comprises a measuring line, a low-voltage direct-current power supply, an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a silicon controlled rectifier and an indicator light, wherein one end of the first resistor is electrically connected with the input end of the protective pressing plate through the measuring line, and the other end of the first resistor is connected with a non-inverting input end of the operational amplifier; the other end of the first resistor is also connected with the second resistor in series and then is grounded, and the third resistor and the fourth resistor are connected in series and then is connected between the positive pole of the low-voltage direct-current power supply and the ground; the inverting input end of the operational amplifier is connected with the series-connection point of the third resistor and the fourth resistor; the output end of the operational amplifier is connected with the gate pole of the silicon controlled rectifier, and the positive pole of the silicon controlled rectifier passes through the fifth resistor and then is connected into the positive pole of the low-voltage direct-current power supply; and the negative pole of the silicon controlled rectifier passes through the indicator light and is then grounded. The quick measuring device can be used for directly measuring the electrical quantity of the protective pressing plate to obtain a measuring result from the indicator light, and the wiring is simple, quick, safe, actual and reliable.
Description
Technical field
The utility model relates to the electric measurement instrument, is specifically related to a kind of protection pressing plate rapid measurement device utility model.
Background technology
The equipment of electric system is equiped with protective device, and protective device can be monitored the various electric parameters of power equipment, differentiates the power equipment running status according to electric parameters.When finding electrical equipment fault, protective device starting correlation function sends signals to miscellaneous equipment, and signal can be used for tripping operation, reports to the police, or with the miscellaneous equipment exchange message etc.
During the protective device starting, will send signals to protected equipment.As shown in Figure 1, in the signal circuit of protective device, series connection is provided with the protection pressing plate, and protection pressing plate upper end 1 output terminal for the protection pressing plate connects protected device, and protection pressing plate lower end 2 input ends for the protection pressing plate connect protective device; The protection pressing plate is equivalent to the switch that can see cut-off point.The protection pressing plate is when open position, and this signal circuit is obstructed; The protection pressing plate is when closed position, and this signal circuit is connected, when protective device start, signal move towards from protective device 4 → protection pressing plate lower end 2 → the protection pressing plate on 1 → protected equipment 3, the transmission of completion signal.The control line of protection pressing plate is guided on the protective device panel, should the disconnection of protection pressing plate according to defencive function needs operations or close by the staff.
Can an important ring be exactly the outlet of normally posting a letter of test protection pressing plate in the protective device periodic inspection.Make the project of protective device starting that overcurrent, overvoltage, non electrical quantity, malfunctioning or the like arranged; Function has I section, II section, III section again; And mode such as time limit, the tripping operation of two time limits; Therefore the jumping high side switch that tripping operation outlet has, the jumping bus connection switch that has, all switches of full jumping that have need the trip avoidance function of No. tens protective devices of verification, obviously can not belt switch deciliters tens times; Also can not send the simulated failure signal in the process of the test to protected equipment, make protected equipment take for fault and take place.
Present protection pressing plate metering system has:
1) multimeter metering system: multimeter commonly used is at present measured the protection pressing plate; The protective device starting once generally can only be measured a block pressur plate signal; Because need tens start protection functions, also will test protective device starting tens times, expended a large amount of Measuring Time.The liquid crystal display of multimeter has time-delay, is not suitable for measuring the defencive function of utmost point short time starting.
2) test instrument metering system: can opening with the protection test appearance into measurement piezometric partitioned signal.The protection test appearance need be introduced institute's pressure measurement plate corresponding switch control positive supply to test instrument; Going between to from test instrument protects the pressing plate lower end to measure again; Because tens block protection pressing plates are arranged in the protection screen; The power supply that tens block protection pressing plates are connect is not necessarily same group of direct supply, therefore when the protection pressing plate adopts different power supplys, in measuring process, needs ceaselessly to change positive supply according to the power supply of protection pressing plate and is input in the test instrument; Need to connect power supply group frequent change power lead, expended the plenty of time according to the protection pressing plate.And wiring is complicated, and the maloperation meeting makes positive supply go here and there switch through the pressing plate upper end to cause the protection misoperation, caused when once occurring using certain test instrument measuring pressure plate that the switch trip accident takes place.
In addition, the surveying instrument slotted line of present protection pressing plate all is the zero impedance design, bumps the switch trip that the trip(ping) circuit meeting causes operation with zero impedance slotted line mistake; The surveying instrument of protection pressing plate all adopts the control power supply of 220V, if the working power of surveying instrument seals in the upper end of protection pressing plate, will cause switch trip.Can know according to present metering system, the protection pressing plate is measured the labor time, reduce work efficiency; Complicated wiring causes maloperation to cause switch trip easily.
The utility model content
The utility model technical matters to be solved just provides a kind of protection pressing plate rapid measurement device, realizes directly measuring the electric parameters of protection pressing plate, and obtains measurement result from pilot lamp, simple, the quick and safe, true and reliable of wiring when it is measured.
Utility model is for solving the problems of the technologies described above, and the technical scheme that the utility model is taked is following:
A kind of protection pressing plate rapid measurement device; It comprises slotted line, low-voltage dc power supply, operational amplifier, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, controllable silicon and pilot lamp; One end of said first resistance is electrically connected with the input end of said protection pressing plate through slotted line; The other end of first resistance links to each other with the in-phase input end of operational amplifier; Ground connection after the other end of said first resistance is also connected with second resistance is connected between low-voltage dc power supply positive pole and the ground after said the 3rd, the 4th resistance series connection, and the series connection point of the inverting input of said operational amplifier and the 3rd, the 4th resistance links to each other; The output terminal of said operational amplifier links to each other with the silicon controlled gate pole, and it is anodal that said silicon controlled anode inserts low-voltage dc power supply after through the 5th resistance, and said silicon controlled negative electrode is through ground connection behind the pilot lamp.
Thus, can detect the electric parameters of protection pressing plate through slotted line, measured voltage is input to operational amplifier and compares computing over the ground, through the light on and off acquisition measurement result of pilot lamp.
On the basis of the above, the utility model can be done following improvement:
Said slotted line is in series with the above resistance of mega-ohms, so that slotted line has high impedance.
Utility model compared with prior art the utlity model has following advantage:
1), this protection pressing plate measurement mechanism need not introduce the control power supply of protective device, causes the potential safety hazard of switch trip or DC earthing in the time of eliminating the DC control supply maloperation; When measuring the protection pressing plate, need not introduce in the used direct supply auto levelizer of this switch; The power supply group that is also connect without the distinguishing protection pressing plate; As long as the positive electric signal of protection starting appears in protection pressing plate lower end, this measurement mechanism can measure the correct operation signal of this pressing plate;
2), the high impedance slotted line of the slotted line of this protection pressing plate measurement mechanism can prevent slotted line maloperation, mistake are caused the switch mis-jumping lock when bumping switch control circuit; Even switch-side with slotted line misconnection to pressing plate; The electric current of the feasible slotted line of flowing through of the high impedance of slotted line has only the microampere order electric current, can not cause switch motion;
3), through setting to slotted line impedance and first, second resistance; Survey voltage system over the ground as protection pressing plate measuring method with electric resistance partial pressure, can make the measurement interface earth impedance of this protection pressing plate measurement mechanism reach more than tens of megaohms the measurement mechanism of high impedance; Can guarantee to move when charged measuring the protection pressing plate; The electric signal of protection on the pressing plate will be through tens of megaohm impedance earths, and ground current is extremely faint even can ignore, and the power-supply system of assurance protective device is normally moved;
4), this protection pressing plate measurement mechanism is 0.02s to the voltage change signal response time; Satisfy electric system check fault amount fully in the 1.05 times of requirements that can move of setting value; Measurement result is more accurate; Than the general 0.3s time response time much less of multimeter, can reduce the time that protective device is added the fault amount, avoid institute to add the fault amount and damage protective device;
5), the slotted line of this protection pressing plate measurement mechanism can connect polylith protection pressing plate; To measure polylith protection pressing plate simultaneously; The reviewer is in once protection action of protective device simulation; A plurality of defencive functions that can the verification protective device whether moves, have exempted in the past reviewer's simulated failure over and over again, make the wiring of this protection pressing plate measurement mechanism simply, quick and safe, true and reliable;
6), the power supply of this protection pressing plate measurement mechanism is low-voltage dc power supply, even even low voltage designs makes the working power mistake of measurement mechanism seal in the protection pressing plate, also be not enough to cause switch trip.
Description of drawings
Fig. 1 is the connection synoptic diagram of existing protection pressing plate;
Fig. 2 is the connection synoptic diagram of the utility model protection pressing plate rapid measurement device.
Among the figure: 1, protection pressing plate upper end, 2, protection pressing plate lower end, 3, protected device, 4, protective device, 5, low-voltage dc power supply is anodal; 6,, 7, first resistance, 8, second resistance, 9, the current potential sampled point; 10, electric weight input end, the 11, the 3rd resistance, the 12, the 4th resistance, 13, reference potential; 14, operational amplifier, 15, in-phase input end, 16, inverting input, 17, the output terminal of operational amplifier; 18, controllable silicon, the 19, the 5th resistance, 20, LED light, 21, slotted line.
Embodiment
A kind of protection pressing plate rapid measurement device as shown in Figure 2; It comprises slotted line 21, low-voltage dc power supply, first resistance 7, second resistance 8, the 3rd resistance 11, the 4th resistance 12, operational amplifier 14; One end of first resistance 7 is electrically connected through the input end of slotted line 21 with the protection pressing plate, and the other end of first resistance 7 links to each other with the in-phase input end 15 of operational amplifier 14, ground connection 6 after the other end of first resistance 7 is also connected with second resistance 8; Three, be connected between low-voltage dc power supply anodal 5 and the ground 6 after the series connection of the 4th resistance; The inverting input 16 and the 3rd of operational amplifier 14, the series connection point of the 4th resistance link to each other, and detect the loop thereby constitute, and first, second resistance is divider resistance; Three, the 4th resistance is comparison resistance, and first, second, third, fourth resistance is adjustable resistance.Voltage on second resistance 8 is current potential sampled point 9 voltages, and the voltage on the 4th resistance 12 is reference potential 13 voltages; Wherein, slotted line 21 is in series with the above resistance of mega-ohms, obtains high impedance.
This protection pressing plate rapid measurement device comprises that also controllable silicon 18, the 5th resistance 19, pilot lamp 20, the five resistance 19 are current-limiting resistance, and pilot lamp 20 is a LED light.The output terminal 17 of operational amplifier is connected to the gate pole of controllable silicon 18; The negative electrode of controllable silicon 18 inserts low-voltage dc power supply anodal 5 through the 5th resistance 19 backs; The anode of controllable silicon 18 is through pilot lamp 20 back ground connection; Also being controllable silicon 18 connects with the 5th resistance 19, LED light 20, is connected to low-voltage dc power supply, constitutes the indication loop.
Electric signal on the input end of utility model protection pressing plate gets into from electric weight input end 10 and detects the loop; Electric signal on the input end of feasible protection pressing plate is after the divider resistance dividing potential drop, and the voltage of second resistance 8 will get into the in-phase input end 15 of operational amplifiers 14 through current potential sampled point 9.And the voltage on the 4th resistance 12 gets into the inverting input 16 of operational amplifier 14 through current potential sampled point 13.Adjust the resistance of first, second, third, fourth resistance; Make the voltage of current potential sampled point 9 greater than the voltage of reference potential 13; After operational amplifier 14 detects potential difference (PD), the output terminal 17 output high level of operational amplifier 14, starting controllable silicon 18; The controllable silicon conducting, LED light 20 gets electric lighting.The resistance of the 5th resistance 19 is selected according to supply voltage, so that LED light 20 can operate as normal.
In measuring protection pressing plate process, judge the measurement result of measured equipment according to the light on and off situation of LED light 20, bright when this pilot lamp, show that this protection pressing plate has positive potential, the defencive function normal starting of pressing plate is protected in representative; When this LED light 20 does not work, show that this protection pressing plate does not have positive potential, the not starting of defencive function of representative protection pressing plate.
The embodiment of the utility model is not limited thereto; Under the above-mentioned basic fundamental thought of the utility model prerequisite; According to modification, replacement or the change of the ordinary skill knowledge of this area and customary means, all within the utility model rights protection scope to the utility model other various ways that content is made.
Claims (2)
1. protection pressing plate rapid measurement device; It is characterized in that: it comprises slotted line, low-voltage dc power supply, operational amplifier, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, controllable silicon and pilot lamp; One end of said first resistance is electrically connected with the input end of said protection pressing plate through slotted line; The other end of first resistance links to each other with the in-phase input end of operational amplifier; Ground connection after the other end of said first resistance is also connected with second resistance is connected between dc power anode and the ground after said the 3rd, the 4th resistance series connection, and the series connection point of the inverting input of said operational amplifier and the 3rd, the 4th resistance links to each other; The output terminal of said operational amplifier links to each other with the silicon controlled gate pole, and said silicon controlled anode inserts dc power anode after through the 5th resistance, and said silicon controlled negative electrode is through ground connection behind the pilot lamp.
2. protection pressing plate rapid measurement device according to claim 1 is characterized in that: said slotted line is in series with the above resistance of mega-ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220017400XU CN202522677U (en) | 2012-01-13 | 2012-01-13 | Quick measuring device for protective pressing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220017400XU CN202522677U (en) | 2012-01-13 | 2012-01-13 | Quick measuring device for protective pressing plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202522677U true CN202522677U (en) | 2012-11-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220017400XU Withdrawn - After Issue CN202522677U (en) | 2012-01-13 | 2012-01-13 | Quick measuring device for protective pressing plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202522677U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565696A (en) * | 2012-01-13 | 2012-07-11 | 广东电网公司东莞供电局 | Quick measuring device of protective pressing plate and measuring method thereof |
-
2012
- 2012-01-13 CN CN201220017400XU patent/CN202522677U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102565696A (en) * | 2012-01-13 | 2012-07-11 | 广东电网公司东莞供电局 | Quick measuring device of protective pressing plate and measuring method thereof |
| CN102565696B (en) * | 2012-01-13 | 2014-10-01 | 广东电网公司东莞供电局 | Quick measuring device of protective pressing plate and measuring method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121107 Effective date of abandoning: 20141001 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20121107 Effective date of abandoning: 20141001 |
|
| RGAV | Abandon patent right to avoid regrant |