CN111308176A - Special multifunctional voltmeter is measured to safe type protection connection piece - Google Patents
Special multifunctional voltmeter is measured to safe type protection connection piece Download PDFInfo
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- CN111308176A CN111308176A CN202010251724.9A CN202010251724A CN111308176A CN 111308176 A CN111308176 A CN 111308176A CN 202010251724 A CN202010251724 A CN 202010251724A CN 111308176 A CN111308176 A CN 111308176A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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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
- G01R19/14—Indicating direction of current; Indicating polarity of voltage
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to a multifunctional voltmeter special for measuring a safety protection connecting sheet. The multifunctional voltmeter special for measuring the safety protection connecting sheet comprises an input signal detection circuit, a linear rectifying circuit, an amplifying circuit, an input signal polarity indicating circuit, an input positive polarity potential voice prompt signal alarm circuit and a singlechip digital voltmeter; the input signal detection circuit is respectively connected with the linear rectification circuit and the amplification circuit, the linear rectification circuit is then connected with the single chip microcomputer digital voltmeter, and the amplification circuit is then respectively connected with the input signal polarity indication circuit and the input positive polarity potential voice prompt signal alarm circuit. The multifunctional voltmeter specially used for measuring the safety protection connecting sheet can not cause the accidents of transformer substations and electric power caused by tripping of a circuit breaker in operation, direct current locking of high-voltage transmission and the like.
Description
Technical Field
The invention relates to the field of relay protection, in particular to the technical field of relay protection of a high-voltage direct-current power transmission system, a high-voltage alternating-current power transmission system, a power transformation system and the like.
Background
In high-voltage alternating current power transmission and transformation and direct current power transmission with voltage class of 220kV and above, 2-3 sets of protection of lines and important equipment are configured to improve the safety and reliability of protection.
When a set of protection faults or operation mode changes in operation need to quit and change the protection fixed value, the protection outlet connecting sheet in operation needs to quit. After fault treatment or fixed value modification is finished, operation is required to be carried out, if a protection outlet loop relay contact is bonded, and a protection outlet connecting sheet is put into operation, a generator, a transformer, a line and high-voltage direct-current transmission in operation can be tripped or locked, so that great power loss is caused, the load of a power system is suddenly reduced, large-area power failure is caused to influence the safety of lives and properties of people, the power system can be dragged across in severe cases, and the situation is not assumed.
Therefore, when the protection outlet connection sheet is put into operation, the potential on both sides of the protection outlet connection sheet needs to be measured, and when the protection outlet connection sheet has a different polarity potential, the protection outlet connection sheet cannot be put into operation. The inspection method generally adopts a universal meter for measurement, and the occurrence of power accident events is often caused by using wrong universal meter gears and jacks in the measurement process, and the same problems also occur by adopting a proprietary voltage phase meter.
In order to invent a test pencil with high safety, small volume and light weight, the invention researches the two-heteropolarity potential detection device of the protection outlet connecting sheet.
Disclosure of Invention
In view of the above problems, the present invention is directed to solving the above-described problems. It is an object of the present invention to provide a safety protection connection pad dedicated multifunctional voltmeter to solve the above problems. In particular, the invention relates to a power measuring device with high safety, small volume and light weight.
The technical scheme of the invention is as follows: the utility model provides a special multi-functional voltmeter is measured to safe type protection connection piece, includes input signal detection circuitry, linear rectifier circuit, amplifier circuit, input signal polarity indicating circuit, input positive polarity electric potential voice prompt signal warning circuit, singlechip digital voltmeter, input signal detection circuitry is connected with linear rectifier circuit, amplifier circuit respectively, and linear rectifier circuit is connected with singlechip digital voltmeter again, and amplifier circuit is connected with input signal polarity indicating circuit, input positive polarity electric potential voice prompt signal warning circuit respectively again.
Further, the input signal detection circuit comprises interfaces CK +, CK-, resistors R01 and R00.
The linear rectifying circuit comprises an operational amplifier A1, resistors R11, R12, R13, diodes D1, D2, D3 and D4.
The amplifying circuit comprises an operational amplifier A2, resistors R21, R22 and R23.
The input signal polarity indicating circuit comprises a resistor R24, a light emitting diode LED1 and a light emitting diode LED 2.
The alarm circuit for inputting the positive polarity potential voice prompt signal comprises a resistor R25, a triode T, a monolithic integrated circuit chip IC capable of recording music and a loudspeaker SP.
The interfaces CK + and CK-are respectively connected with the positive electrode and the negative electrode of an input signal, the interface CK + is respectively connected with the first end of the resistor R00, the first end of the resistor R11 and the first end of the resistor R21 through the resistor R01, and the second end of the resistor R00 is respectively connected with the first end of the resistor R12, the first end of the resistor R22 and the ground; the second end of the resistor R11 is respectively connected with the first end of the resistor R13 and the non-inverting input end of the operational amplifier A1, the second end of the resistor R12 is connected with the inverting input end of the operational amplifier A1, the second end of the resistor R13 is respectively connected with the anode of the diode D1 and the cathode of the diode D3, the cathode of the diode D1 is respectively connected with the cathode of the diode D2 and one end of the singlechip digital voltmeter, the anode of the diode D3 is respectively connected with the anode of the diode D4 and the other end of the singlechip digital voltmeter, and the anode of the diode D2 and the cathode of the diode D4 are connected with the output end of the operational amplifier A1.
The second end of the resistor R21 is connected to the non-inverting input terminal of the operational amplifier A2 and the first end of the resistor R23, the second end of the resistor R22 is connected to the inverting input terminal of the operational amplifier A2, the second end of the resistor R23 is connected to the first end of the resistor R24, the first end of the resistor R25 and the output terminal of the operational amplifier A2, the second end of the resistor R24 is connected to the anode of the light emitting diode LED1 and the cathode of the light emitting diode LED2, the cathodes of the light emitting diode LED1 and the anode of the light emitting diode LED2 are both grounded, the second end of the resistor R25 is connected to the base of the triode T, the emitter of the triode T is grounded, the collector of the triode T is connected to the power supply through the monolithic integrated circuit chip IC capable of recording music, and the monolithic integrated circuit chip IC capable of recording music.
The invention has the beneficial effects that:
the invention can display the measured positive potential and negative potential values, can also indicate the voice signal of the positive potential, and when the negative potential is measured, the measured voltage value is displayed, and meanwhile, the blue indicator lamp is also lighted to indicate the signal that the tripping circuit is in good condition to the negative power supply circuit.
The invention provides a multifunctional voltmeter special for measuring a seed safety type protection connecting sheet, which is more convenient, safe and efficient to use.
Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 exemplarily shows a structural schematic diagram of a safety type protection connection sheet special multifunctional voltmeter for measurement.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The invention aims to solve the problems that the potentials at two ends of a tripping connection sheet of a protection outlet need to be measured after the protection fixed value is changed in a converter station, an alternating current transformer substation and a power plant of the high-voltage direct-current transmission at present, and the high-voltage direct-current transmission is locked and a breaker trips due to the fact that the internal resistance of a shift position for a multimeter, a wrong insertion jack and a test pencil is low, so that accident events such as power grid fluctuation, power loss of customers and the like occur. The invention only has a jack for measuring voltage, can display the measured positive potential and negative potential values, and can also indicate the voice signal of the positive potential (a red light-emitting diode is luminous, a horn reports a 'protection outlet, when the user is in charge of tripping!'), when the negative potential is measured, the measured voltage value is displayed, and simultaneously, a blue indicator lamp is luminous, and the signal indicating that the tripping circuit is in good condition to the negative power supply circuit is provided.
The multifunctional voltmeter special for measuring the safety protection connecting sheet provided by the invention is described in detail below with reference to the attached drawings.
As shown in fig. 1, a special multifunctional voltmeter for measuring a safety protection connecting sheet comprises an input signal detection circuit, a linear rectification circuit, an amplification circuit, an input signal polarity indication circuit, an input positive polarity potential voice prompt signal alarm circuit and a singlechip digital voltmeter;
the input signal detection circuit is respectively connected with the linear rectification circuit and the amplification circuit, the linear rectification circuit is then connected with the single chip microcomputer digital voltmeter, and the amplification circuit is then respectively connected with the input signal polarity indication circuit and the input positive polarity potential voice prompt signal alarm circuit.
Further, the input signal detection circuit comprises interfaces CK +, CK-, resistors R01 and R00.
The linear rectifying circuit comprises an operational amplifier A1, resistors R11, R12, R13, diodes D1, D2, D3 and D4.
The amplifying circuit comprises an operational amplifier A2, resistors R21, R22 and R23.
The input signal polarity indicating circuit comprises a resistor R24, a light emitting diode LED1 and a light emitting diode LED 2.
The alarm circuit for inputting the positive polarity potential voice prompt signal comprises a resistor R25, a triode T, a monolithic integrated circuit chip IC capable of recording music and a loudspeaker SP.
The interfaces CK + and CK-are respectively connected with the positive electrode and the negative electrode of an input signal, the interface CK + is respectively connected with the first end of the resistor R00, the first end of the resistor R11 and the first end of the resistor R21 through the resistor R01, and the second end of the resistor R00 is respectively connected with the first end of the resistor R12, the first end of the resistor R22 and the ground; the second end of the resistor R11 is respectively connected with the first end of the resistor R13 and the non-inverting input end of the operational amplifier A1, the second end of the resistor R12 is connected with the inverting input end of the operational amplifier A1, the second end of the resistor R13 is respectively connected with the anode of the diode D1 and the cathode of the diode D3, the cathode of the diode D1 is respectively connected with the cathode of the diode D2 and one end of the singlechip digital voltmeter, the anode of the diode D3 is respectively connected with the anode of the diode D4 and the other end of the singlechip digital voltmeter, and the anode of the diode D2 and the cathode of the diode D4 are connected with the output end of the operational amplifier A1.
The second end of the resistor R21 is connected to the non-inverting input terminal of the operational amplifier A2 and the first end of the resistor R23, the second end of the resistor R22 is connected to the inverting input terminal of the operational amplifier A2, the second end of the resistor R23 is connected to the first end of the resistor R24, the first end of the resistor R25 and the output terminal of the operational amplifier A2, the second end of the resistor R24 is connected to the anode of the light emitting diode LED1 and the cathode of the light emitting diode LED2, the cathodes of the light emitting diode LED1 and the anode of the light emitting diode LED2 are both grounded, the second end of the resistor R25 is connected to the base of the triode T, the emitter of the triode T is grounded, the collector of the triode T is connected to the power supply through the monolithic integrated circuit chip IC capable of recording music, and the monolithic integrated circuit chip IC capable of recording music.
The working principle of the invention is as follows:
the invention comprises an input signal detection circuit, a linear rectification circuit, an amplification circuit, an input signal polarity indicating circuit and an input positive polarity potential voice prompt signal alarm circuit.
The input signal detection circuit comprises interfaces CK +, CK-, resistors R01 and R00, and is used for converting an input high-voltage signal into a low-voltage signal and supplying the low-voltage signal to operational amplifiers A1 and A2 for amplification or detection; by dividing the voltage through resistors, a small voltage is obtained at R00 for convenient measurement.
The linear rectifying circuit comprises an operational amplifier A1, resistors R11, R12, R13, diodes D1, D2, D3 and D4; the linear rectifying circuit rectifies the positive and negative voltages into positive voltages (the miniature digital voltmeter can only measure the voltage in the positive direction), the A1 operational amplifier is used as a core, detected signals are amplified, the amplified signals are linearly rectified and then supplied to the singlechip digital voltmeter V, the voltage is indicated by the V, the indication range of the V is from 1.0V to 250V, and the input positive and negative voltages can display readings, wherein in order to measure the negative voltage, 4 diodes on the A1 amplifier uniformly output the input voltages, which are positive and negative, into positive, so that the normal measurement can be carried out, the A1 operational amplifier is used, and the voltage drop of the diodes is equal to 0 without influencing the measurement accuracy.
The amplifying circuit comprises an operational amplifier A2, resistors R21, R22 and R23; the input voltage can be amplified by 10 times and then output, and the amplified voltage is supplied to a light emitting diode LED1 and a light emitting diode LED2 through a resistor R24 to indicate the polarity of an input signal; the amplifier circuit amplifies the voltage of R00 to make LED1 and LED2 emit light, and when the voltage is positive, the IC circuit is operated to give out voice signals.
The input signal polarity indicating circuit comprises a resistor R24, a light emitting diode LED1 and a light emitting diode LED 2; when the input voltage signal is positive, the a2 operational amplifier outputs a positive potential, and the LED1 is red lit, indicating that the input signal is positive. If the input voltage signal is negative, the A2 operational amplifier outputs a negative potential, the LED2 blue light is on, and the input signal is negative.
The alarm circuit for inputting the positive polarity potential voice prompt signal comprises a resistor R25, a triode T, a monolithic integrated circuit chip IC capable of recording music and a loudspeaker SP; when the input signal is positive, A2 outputs high potential after amplification, the high potential is added to the b electrode of the triode T through the resistor R25, the c electrode of the triode T is conducted to supply power to the integrated circuit IC, and the IC plays the recorded protection outlet, which is tripped carelessly! ") warning not to be put into protection of the outlet connection, or there may be an accident event that could cause the grid or equipment.
The above-described aspects may be implemented individually or in various combinations, and such variations are within the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.
The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.
Claims (2)
1. The utility model provides a special multi-functional voltmeter is measured to safe type protection connection piece which characterized in that: the voice prompt device comprises an input signal detection circuit, a linear rectifying circuit, an amplifying circuit, an input signal polarity indicating circuit, an input positive polarity potential voice prompt signal alarm circuit and a single chip microcomputer digital voltmeter, wherein the input signal detection circuit is respectively connected with the linear rectifying circuit and the amplifying circuit, the linear rectifying circuit is then connected with the single chip microcomputer digital voltmeter, and the amplifying circuit is respectively connected with the input signal polarity indicating circuit and the input positive polarity potential voice prompt signal alarm circuit.
2. The safety type protection connection sheet special purpose multifunctional voltmeter according to claim 1, wherein:
the input signal detection circuit comprises interfaces CK +, CK-, a resistor R01 and R00, the linear rectification circuit comprises an operational amplifier A1, a resistor R11, R12, R13, a diode D1, D2, D3 and D4, the amplification circuit comprises an operational amplifier A2, a resistor R21, R22 and R23, the input signal polarity indication circuit comprises a resistor R24, a light emitting diode LED1 and a light emitting diode LED2, the input positive polarity potential voice prompt signal alarm circuit comprises a resistor R25, a triode T, a single chip IC capable of recording music and a loudspeaker SP, the interfaces CK + and CK-are respectively externally connected with the positive and negative poles of an input signal, the interface CK + is respectively connected with the first end of the resistor R00, the first end of the resistor R11 and the first end of the resistor R21 through the resistor R01, the second end of the resistor R00 is respectively connected with the first end of the resistor R12, the first end of the resistor R22 and the ground, the second end of the resistor R11 is respectively connected with the first end of the resistor R13 and the non-inverting input end of the operational amplifier A1, the second end of the resistor R12 is connected with the inverting input end of the operational amplifier A1, the second end of the resistor R13 is respectively connected with the anode of the diode D1 and the cathode of the diode D3, the cathode of the diode D1 is respectively connected with the cathode of the diode D2 and one end of the singlechip digital voltmeter, the anode of the diode D3 is respectively connected with the anode of the diode D4 and the other end of the singlechip digital voltmeter, and the anode of the diode D2 and the cathode of the diode D4 are connected with the output end of the operational amplifier A1; the second end of the resistor R21 is connected to the non-inverting input terminal of the operational amplifier A2 and the first end of the resistor R23, the second end of the resistor R22 is connected to the inverting input terminal of the operational amplifier A2, the second end of the resistor R23 is connected to the first end of the resistor R24, the first end of the resistor R25 and the output terminal of the operational amplifier A2, the second end of the resistor R24 is connected to the anode of the light emitting diode LED1 and the cathode of the light emitting diode LED2, the cathodes of the light emitting diode LED1 and the anode of the light emitting diode LED2 are both grounded, the second end of the resistor R25 is connected to the base of the triode T, the emitter of the triode T is grounded, the collector of the triode T is connected to the power supply through the monolithic integrated circuit chip IC capable of recording music, and the monolithic integrated circuit chip IC capable of recording music.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010251724.9A CN111308176A (en) | 2020-04-01 | 2020-04-01 | Special multifunctional voltmeter is measured to safe type protection connection piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010251724.9A CN111308176A (en) | 2020-04-01 | 2020-04-01 | Special multifunctional voltmeter is measured to safe type protection connection piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111308176A true CN111308176A (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010251724.9A Pending CN111308176A (en) | 2020-04-01 | 2020-04-01 | Special multifunctional voltmeter is measured to safe type protection connection piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111308176A (en) |
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2020
- 2020-04-01 CN CN202010251724.9A patent/CN111308176A/en active Pending
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