CN105954572A - Pressure plate special-purpose voltmeter - Google Patents
Pressure plate special-purpose voltmeter Download PDFInfo
- Publication number
- CN105954572A CN105954572A CN201610440658.3A CN201610440658A CN105954572A CN 105954572 A CN105954572 A CN 105954572A CN 201610440658 A CN201610440658 A CN 201610440658A CN 105954572 A CN105954572 A CN 105954572A
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- CN
- China
- Prior art keywords
- test pencil
- circuit
- pressing plate
- pressure plate
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to a pressure plate special-purpose voltmeter. The pressure plate special-purpose voltmeter is characterized by comprising a host, a positive probe and a negative probe, wherein one end of the positive probe and one end of the negative probe are connected with a tested pressure plate, and the other ends of the positive probe and the negative probe, after being subjected to voltage division by resistors, are connected with a sampling circuit of the host; and the host comprises the sampling circuit, an amplification circuit, an AD conversion circuit, a microprocessor and a liquid crystal display. According to the invention, shift selection is eliminated, high input impedance is realized, insertion holes are not wrongly used, and thus measurement safety is guaranteed. Probe lines are additionally provided with high-voltage-resistant large-power resistors, when internal insulation of the pressure plate special-purpose voltmeter is broken down, the measurement safety can also be ensured, wrong switch tripout of a DC system is not caused, and reliable operation of a power network is guaranteed.
Description
Technical field
The present invention relates to electrical technology field, particularly relate to a kind of pressing plate specialized voltages table, for straight-flow system
When pressing plate puts into, measuring pressure plate two-port DC voltage over the ground, it is widely used in the direct current such as power plant, transformer station
The voltage measurement of system.
Background technology
In power system, circuit tester measuring pressure plate opening two ends direct current over the ground must be used when putting into pressing plate
Voltage, it is ensured that pressing plate opening two ends do not have " one positive one negative " voltage, could put into；Otherwise, operation can be caused
Switch mis-jumping lock.But during using circuit tester measuring pressure plate opening two ends DC voltage over the ground, warp
Chang Yinwei underlying cause causes switch mis-jumping lock.
1), when staff uses the pressing plate that main transformer protection screen measured by circuit tester, DC voltage shelves should be selected,
But often falsely drop with the resistance grade of circuit tester so that pressing plate, through the circuit tester short circuit over the ground of resistance grade, causes main transformer
Step-down 501 switch trip.
2), when staff uses circuit tester to measure stability control device pressing plate, because these circuit tester DC voltage shelves are exhausted
Edge punctures so that pressing plate short circuit over the ground, adds the interference of the factors such as distribution capacity, causes operating circuit to open
Close tripping operation.
3), when staff uses circuit tester to measure 110kV route protection pressing plate, easily voltage socket will be inserted
Positive wire be mistakenly inserted the jack of electric current so that pressing plate, through circuit tester short circuit over the ground, causes 110kV in operation
Line switching trips.
This type of accident has had a strong impact on the reliability of power supply, has undesirable effect the normal electricity consumption of user.
Summary of the invention
Present invention aims to staff when using circuit tester measuring pressure plate, choosing wrong gear, test pencil hole
The position problem such as wrong plug, circuit tester DC voltage shelves insulation breakdown, it is provided that a kind of pressing plate specialized voltages table.
The present invention realizes by taking following measure:
Voltmeter, including main frame, positive test pencil and negative test pencil, one end of positive test pencil and negative test pencil is with tested pressing plate even
Connect, the other end of positive test pencil and negative test pencil after electric resistance partial pressure respectively sample circuit with main frame be connected；Described
Main frame include sample circuit, amplifying circuit, A/D convertor circuit, microprocessor and liquid crystal display, sampling
Circuit, amplifying circuit, A/D convertor circuit, microprocessor and liquid crystal display are sequentially connected with.
Positive test pencil and negative test pencil include that clamp joint, a line and connection-peg, the two ends of line connecting clamp respectively connect
Head and connection-peg, a line is provided with resistance.
The described resistance on a line is the k high pressure resistant high-power resistance of Ω level.
The shell body of described main frame is provided with positive test pencil and two jacks of negative test pencil.
Advantages of the present invention effect is as follows:
1, pressing plate specialized voltages table selects without gear, and jack only limits two, high input impedance, it is ensured that measure peace
Entirely.
2, the test pencil internal resistance of pressing plate specialized voltages table is for reaching the k high pressure resistant high-power resistance of Ω level, puts at pressing plate
When special table built-in electrical insulation is breakdown, system under test (SUT) will not be caused to break down.
3, can measure range is 500V DC voltage and alternating voltage.
Accompanying drawing explanation
Fig. 1 is pressing plate specialized voltages table main frame external structure.
Fig. 2 a is the positive test pencil external structure schematic diagram of pressing plate specialized voltages table.
Fig. 2 b is that test pencil external structure schematic diagram born by pressing plate specialized voltages table.
Fig. 3 is the schematic block circuit diagram of pressing plate specialized voltages table.
Fig. 4 is the pressure sampling circuit figure of pressing plate specialized voltages table.
Fig. 5 is the circuit theory diagrams of circuit tester measuring pressure plate.
Circuit theory diagrams when Fig. 6 a is no ground, during circuit tester measuring pressure plate generation maloperation.
Circuit theory diagrams when Fig. 6 b is no ground, during voltmeter measuring pressure plate generation maloperation of the present invention.
Circuit theory diagrams when Fig. 7 a is positive pole full ground connection, during circuit tester measuring pressure plate generation maloperation.
Circuit theory diagrams when Fig. 7 b is positive pole full ground connection, during voltmeter measuring pressure plate generation maloperation of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
Voltmeter, including main frame, positive test pencil and negative test pencil, one end of positive test pencil and negative test pencil is with tested pressing plate even
Connect, the other end of positive test pencil and negative test pencil after electric resistance partial pressure respectively sample circuit with main frame be connected；Described
Main frame include sample circuit, amplifying circuit, A/D convertor circuit, microprocessor and liquid crystal display, sampling
Circuit, amplifying circuit, A/D convertor circuit, microprocessor and liquid crystal display are sequentially connected with.
Pressing plate specialized voltages table main frame external structure is as it is shown in figure 1, mainly include 4, two test pencils of on and off switch
The pressing plate specialized voltages watch case 1 that jack 3, liquid crystal display 2 and insulant make.Liquid crystal display 2
Can intuitively show measured magnitude of voltage size and waveform.Test pencil jack 3 is only provided with 2 jacks, it is ensured that table
Pen will not wrong plug and cause the accident.On and off switch 4 can in the case of not using deenergization, beat again during use
Switch power supply, extends the service life of battery.
The positive test pencil external structure schematic diagram of pressing plate specialized voltages table as shown in Figure 2 a, pressing plate specialized voltages table
As shown in Figure 2 b, positive test pencil and negative test pencil include clamp joint, a line and insert negative test pencil external structure schematic diagram
Joint, the two ends of a line connecting clamp joint and connection-peg respectively, on the test pencil line of positive test pencil and negative test pencil respectively
It is equipped with the 3k high pressure resistant high-power resistance of Ω level.After can ensure that special table insulation is breakdown, during measurement voltage not
System under test (SUT) can be caused to trip, it is ensured that electrical network reliability service.
As it is shown on figure 3, be the schematic block circuit diagram of pressing plate specialized voltages table.Measured voltage passes through test pencil
To sample circuit, sample circuit obtains direct current signal through dividing potential drop sampling, direct current signal through amplifying circuit and
A/D convertor circuit, the AD port eventually passing microprocessor is acquired, the microprocessor signal to gathering
After being analyzed processing, numerical value is shown on a liquid crystal display.
As shown in Figure 4, for the sample circuit of pressing plate specialized voltages table.Tested DC voltage is by resistance R1
Direct current sampling value DC0 is obtained with the sampling of R2 dividing potential drop；Tested alternating voltage is sampled by resistance R and R3 dividing potential drop
Obtain exchanging sampling value AC0.
As it is shown in figure 5, be the circuit theory diagrams of circuit tester measuring pressure plate.
Circuit theory diagrams as shown in Figure 6 a, time no ground, during circuit tester measuring pressure plate generation maloperation.Figure
When 6b is no ground, circuit theory diagrams during voltmeter measuring pressure plate generation maloperation of the present invention, relative analysis
As follows:
1) circuit tester table insulation breakdown, misuse gear and misuse jack time:
UTQ=110V >=30%UN
Breaking coil TQ may action.
2) pressing plate specialized voltages table is when table insulation is breakdown:
UTQ=110*200/ (200+6000)=3.5V≤30%UN
UTQMuch smaller than operation voltage, breaking coil TQ is failure to actuate.
Circuit theory diagrams when Fig. 7 a is positive pole full ground connection, during circuit tester measuring pressure plate generation maloperation；Fig. 7 b
Circuit theory diagrams during ground connection complete for positive pole, during voltmeter measuring pressure plate generation maloperation of the present invention.Relative analysis
As follows:
1) during plus earth, circuit tester table insulation breakdown, misuse gear and misuse jack time:
UTQ=220V >=30%UN
Breaking coil TQ may action.
2), during plus earth, pressing plate specialized voltages table is when table insulation breakdown:
UTQ=220*200/ (200+6000)=7.1V≤30%UN
UTQMuch smaller than operation voltage, breaking coil TQ is failure to actuate.
220V system platen relative analysis measured by circuit tester and pressing plate specialized voltages table:
In the case of no ground, circuit tester is breakdown at built-in electrical insulation, when misusing gear and misuse jack,
UTQ=110V >=30%UN, breaking coil TQ may action；Pressure pressing plate specialized voltages table is breakdown at built-in electrical insulation
Time, UTQ=110*200/ (200+6000)=3.5V≤30%UN, much smaller than operation voltage, breaking coil TQ
It is failure to actuate.
In the case of the full ground connection of positive pole, circuit tester is breakdown at built-in electrical insulation, when misusing gear and misuse jack,
UTQ=220V >=30%UN, breaking coil TQ may action；Pressing plate specialized voltages table when built-in electrical insulation is breakdown,
UTQ=220*200/ (200+6000)=7.1V≤30%UN, much smaller than operation voltage, breaking coil TQ is failure to actuate.
Pressing plate specialized voltages table and circuit tester are measured voltage accuracy and are contrasted:
| Sequence number | Pressing plate puts into special table | Circuit tester |
| 1 | 20.2 | 20.0 |
| 2 | 40.4 | 40.2 |
| 3 | 60.0 | 60.1 |
| 4 | 110.1 | 110.1 |
| 5 | 150.3 | 150.2 |
| 6 | 220.3 | 220.4 |
| 7 | 299.6 | 300.0 |
Claims (4)
1. pressing plate specialized voltages table, it is characterised in that include main frame, positive test pencil and negative test pencil, one end of positive test pencil and negative test pencil is connected with tested pressing plate, the other end of positive test pencil and negative test pencil after electric resistance partial pressure respectively sample circuit with main frame be connected；Described main frame includes that sample circuit, amplifying circuit, A/D convertor circuit, microprocessor and liquid crystal display, sample circuit, amplifying circuit, A/D convertor circuit, microprocessor and liquid crystal display are sequentially connected with.
Pressing plate specialized voltages table the most according to claim 1, it is characterised in that described positive test pencil and negative test pencil include clamp joint, a line and connection-peg, the two ends of a line connecting clamp joint and connection-peg respectively, a line is provided with resistance.
Pressing plate specialized voltages table the most according to claim 2, it is characterised in that the described resistance on test pencil line is the k high pressure resistant high-power resistance of Ω level.
Pressing plate specialized voltages table the most according to claim 1, it is characterised in that the shell body of described main frame is provided with positive test pencil and two jacks of negative test pencil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610440658.3A CN105954572A (en) | 2016-06-17 | 2016-06-17 | Pressure plate special-purpose voltmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610440658.3A CN105954572A (en) | 2016-06-17 | 2016-06-17 | Pressure plate special-purpose voltmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105954572A true CN105954572A (en) | 2016-09-21 |
Family
ID=56907246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610440658.3A Pending CN105954572A (en) | 2016-06-17 | 2016-06-17 | Pressure plate special-purpose voltmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105954572A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062727A (en) * | 2021-11-17 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司柳州局 | Protective pressing plate rapid measuring instrument and protective pressing plate voltage measuring method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983831A (en) * | 2014-05-14 | 2014-08-13 | 国家电网公司 | Voltmeter and voltmeter pen special for protecting pressure plate |
| CN203811671U (en) * | 2014-05-14 | 2014-09-03 | 国家电网公司 | Voltmeter and meter pen special for protection pressure plate |
| CN204214941U (en) * | 2014-10-22 | 2015-03-18 | 广东电网有限责任公司东莞供电局 | Special voltmeter for relay protection system tripping circuit pressing plate input |
-
2016
- 2016-06-17 CN CN201610440658.3A patent/CN105954572A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983831A (en) * | 2014-05-14 | 2014-08-13 | 国家电网公司 | Voltmeter and voltmeter pen special for protecting pressure plate |
| CN203811671U (en) * | 2014-05-14 | 2014-09-03 | 国家电网公司 | Voltmeter and meter pen special for protection pressure plate |
| CN204214941U (en) * | 2014-10-22 | 2015-03-18 | 广东电网有限责任公司东莞供电局 | Special voltmeter for relay protection system tripping circuit pressing plate input |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062727A (en) * | 2021-11-17 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司柳州局 | Protective pressing plate rapid measuring instrument and protective pressing plate voltage measuring method |
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Application publication date: 20160921 |
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