A multifunctional voltmeter for measuring safety protection connection pieces

Abstract

The present invention relates to a multifunctional voltmeter for measuring safety-type protective connecting pieces. The multifunctional voltmeter for measuring safety-type protective connecting pieces comprises an input signal detection circuit, a linear rectifier circuit, an amplifier circuit, an input signal polarity indication circuit, an input positive polarity potential voice prompt signal alarm circuit, and a single-chip digital voltmeter; the input signal detection circuit is respectively connected to the linear rectifier circuit and the amplifier circuit, the linear rectifier circuit is further connected to the single-chip digital voltmeter, and the amplifier circuit is further connected to the input signal polarity indication circuit and the input positive polarity potential voice prompt signal alarm circuit. The multifunctional voltmeter for measuring safety-type protective connecting pieces will not cause the occurrence of accidents in substations and power, such as the tripping of circuit breakers in operation and the DC interlocking of high-voltage power transmission.

Description

Technical Field

[0001] The present invention relates to the field of relay protection, and in particular to the technical field of relay protection for high-voltage direct current transmission systems, high-voltage alternating current transmission systems, substation systems, and the like. Background Art

[0002] In high-voltage AC transmission and transformation and DC transmission of 220kV and above voltage levels, 2-3 sets of protection are configured for lines and important equipment to improve the safety and reliability of protection.

[0003] When a set of protection fails or the operation mode changes during operation and needs to be exited to change the protection setting, the protection outlet connector in operation needs to be exited. After the fault handling or setting modification is completed, it needs to be put into operation. If the relay contacts of the protection outlet circuit are bonded, the protection outlet connector may cause the running generator, transformer, line, and high-voltage DC transmission to trip or lock, causing great power loss, causing a sudden reduction in the load of the power system, causing large-scale power outages that affect the safety of people's lives and property, and in severe cases, it will drag down the power system, with unimaginable consequences.

[0004] Therefore, when the protective outlet connector is put into operation, the potential on both sides needs to be measured. If there is a potential of opposite polarity, it cannot be put into operation. The inspection method is generally measured with a multimeter, and the wrong multimeter gear and jack are often used during the measurement process, which often leads to power accidents. Even the patented voltage phase meter has the same problem.

[0005] In order to invent a test pen with high safety, small size and light weight, the present invention has developed a device for detecting the potentials of two opposite polarities of the protection outlet connecting piece. Summary of the invention

[0006] In view of the above problems, the present invention aims to solve the above problems. One object of the present invention is to provide a multifunctional voltmeter for measuring safety protection connecting pieces to solve the above problems. Specifically, the present invention is a highly safe, small-sized and light-weight electrical measuring device.

[0007] The technical solution of the present invention is: a multifunctional voltmeter specially used for measuring a safety protection connecting piece, comprising an input signal detection circuit, a linear rectification circuit, an amplifying circuit, an input signal polarity indication circuit, an input positive polarity potential voice prompt signal alarm circuit, and a single-chip digital voltmeter. The input signal detection circuit is respectively connected to the linear rectification circuit and the amplifying circuit, the linear rectification circuit is further connected to the single-chip digital voltmeter, and the amplifying circuit is further respectively connected to the input signal polarity indication circuit and the input positive polarity potential voice prompt signal alarm circuit.

[0008] Furthermore, the input signal detection circuit includes interfaces CK+, CK-, and resistors R01 and R00.

[0009] The linear rectifier circuit includes an operational amplifier A1, resistors R11, R12, R13, and diodes D1, D2, D3, and D4.

[0010] The amplifying circuit includes an operational amplifier A2, and resistors R21, R22, and R23.

[0011] The input signal polarity indication circuit includes a resistor R24, a light emitting diode LED1, and a light emitting diode LED2.

[0012] The positive polarity potential input voice prompt signal alarm circuit comprises a resistor R25, a transistor T, a single-chip integrated circuit chip IC capable of recording music, and a loudspeaker SP.

[0013] The interfaces CK+ and CK- are respectively connected to the positive and negative electrodes of the input signal, and the interface CK+ is respectively connected to 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 to 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 to 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 to the inverting input end of the operational amplifier A1, the second end of the resistor R13 is respectively connected to the positive electrode of the diode D1 and the negative electrode of D3, the negative electrode of the diode D1 is respectively connected to the negative electrode of the diode D2 and one end of the single-chip digital voltmeter, the positive electrode of the diode D3 is respectively connected to the positive electrode of the diode D4 and the other end of the single-chip digital voltmeter, and the positive electrode of the diode D2 and the negative electrode of the diode D4 are connected to the output end of the operational amplifier A1.

[0014] The second end of the resistor R21 is respectively connected to the non-inverting input end of the operational amplifier A2 and the first end of the resistor R23, the second end of the resistor R22 is respectively connected to the inverting input end of the operational amplifier A2, the second end of the resistor R23 is respectively connected to the first end of the resistor R24, the first end of the resistor R25, and the output end of the operational amplifier A2, the second end of the resistor R24 ​​is respectively connected to the positive electrode of the light-emitting diode LED1 and the negative electrode of the light-emitting diode LED2, the negative electrode of the light-emitting diode LED1 and the positive electrode of the light-emitting diode LED2 are both grounded, the second end of the resistor R25 is connected to the base of the transistor T, the emitter of the transistor T is grounded, the collector of the transistor T is connected to the power supply through the single-chip integrated circuit chip IC that can record music, and the single-chip integrated circuit chip IC that can record music is also connected to the speaker SP.

[0015] The beneficial effects of the present invention are:

[0016] The present invention can display the measured positive potential and negative potential values, and can also indicate the voice signal of the positive potential. When the negative potential is measured, the measured voltage value is displayed, and a blue indicator light is lit, indicating that the trip circuit to the negative power supply circuit is intact.

[0017] The present invention provides a multifunctional voltmeter for measuring a safety protection connecting piece, which is more convenient, safe and efficient to use. The present invention detects the protection outlet connecting piece circuit and will not cause the tripping of the circuit breaker in operation, the DC locking of the high-voltage power transmission, and other accidents that may cause the occurrence of transformer substations and power.

[0018] Other characteristic features and advantages of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. For those of ordinary skill in the art, other drawings can be obtained from these drawings without paying creative work.

[0020] Figure 1 The structural schematic diagram of the special multifunctional voltmeter for measuring the safety protection connecting piece of the present invention is exemplarily shown. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily without conflict.

[0022] The basic idea of ​​the present invention is to solve the problem that the potentials at both ends of the tripping connector of the protection outlet need to be measured after the protection setting value is changed in the converter station, AC substation and power plant of the current high-voltage direct current transmission. Due to the wrong gear of the multimeter, the wrong socket, the low internal resistance of the test pen, etc., the high-voltage direct current transmission is locked, the circuit breaker trips, and the power grid fluctuates, the customer loses power and other accidents occur. The present invention only has a socket for measuring voltage, can display the measured positive potential and negative potential values, and can also indicate the voice signal of the positive potential (the red light-emitting diode lights up, and the speaker announces "protection outlet, beware of tripping!"). When the negative potential is measured, the measured voltage value is displayed, and the blue indicator light is also lit, indicating that the tripping circuit to the negative power supply circuit is intact.

[0023] The following describes in detail the multifunctional voltmeter for measuring the safety protection connecting piece provided by the present invention in conjunction with the accompanying drawings.

[0024] like Figure 1 As shown, a multifunctional voltmeter for measuring safety protection connecting pieces includes an input signal detection circuit, a linear rectifier circuit, an amplifier circuit, an input signal polarity indication circuit, an input positive polarity potential voice prompt signal alarm circuit, and a single-chip digital voltmeter;

[0025] The input signal detection circuit is respectively connected to the linear rectification circuit and the amplification circuit, the linear rectification circuit is further connected to the single-chip microcomputer digital voltmeter, and the amplification circuit is further respectively connected to the input signal polarity indication circuit and the input positive polarity potential voice prompt signal alarm circuit.

[0026] Furthermore, the input signal detection circuit includes interfaces CK+, CK-, and resistors R01 and R00.

[0027] The linear rectifier circuit includes an operational amplifier A1, resistors R11, R12, R13, and diodes D1, D2, D3, and D4.

[0028] The amplifying circuit includes an operational amplifier A2, and resistors R21, R22, and R23.

[0029] The input signal polarity indication circuit includes a resistor R24, a light emitting diode LED1, and a light emitting diode LED2.

[0030] The positive polarity potential input voice prompt signal alarm circuit comprises a resistor R25, a transistor T, a single-chip integrated circuit chip IC capable of recording music, and a loudspeaker SP.

[0031] The interfaces CK+ and CK- are respectively connected to the positive and negative electrodes of the input signal, and the interface CK+ is respectively connected to 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 to 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 to 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 to the inverting input end of the operational amplifier A1, the second end of the resistor R13 is respectively connected to the positive electrode of the diode D1 and the negative electrode of D3, the negative electrode of the diode D1 is respectively connected to the negative electrode of the diode D2 and one end of the single-chip digital voltmeter, the positive electrode of the diode D3 is respectively connected to the positive electrode of the diode D4 and the other end of the single-chip digital voltmeter, and the positive electrode of the diode D2 and the negative electrode of the diode D4 are connected to the output end of the operational amplifier A1.

[0032] The second end of the resistor R21 is respectively connected to the non-inverting input end of the operational amplifier A2 and the first end of the resistor R23, the second end of the resistor R22 is respectively connected to the inverting input end of the operational amplifier A2, the second end of the resistor R23 is respectively connected to the first end of the resistor R24, the first end of the resistor R25, and the output end of the operational amplifier A2, the second end of the resistor R24 ​​is respectively connected to the positive electrode of the light-emitting diode LED1 and the negative electrode of the light-emitting diode LED2, the negative electrode of the light-emitting diode LED1 and the positive electrode of the light-emitting diode LED2 are both grounded, the second end of the resistor R25 is connected to the base of the transistor T, the emitter of the transistor T is grounded, the collector of the transistor T is connected to the power supply through the single-chip integrated circuit chip IC that can record music, and the single-chip integrated circuit chip IC that can record music is also connected to the speaker SP.

[0033] The working principle of the present invention is:

[0034] The invention comprises an input signal detection circuit, a linear rectification circuit, an amplification circuit, an input signal polarity indication circuit, and an input positive polarity potential voice prompt signal alarm circuit.

[0035] The input signal detection circuit includes interfaces CK+, CK-, resistors R01, R00, which are used to convert the input high voltage signal into a low voltage signal and supply it to the operational amplifiers A1, A2 circuits for amplification or detection; through resistor voltage division, a small voltage is obtained on R00 to facilitate measurement.

[0036] The linear rectification circuit comprises an operational amplifier A1, resistors R11, R12, R13, and diodes D1, D2, D3, and D4; the linear rectification circuit rectifies both positive and negative voltages into positive voltages (a miniature digital voltmeter can only measure positive voltages). The linear rectification circuit takes the operational amplifier A1 as its core, amplifies the detected signal, and supplies the signal to the single-chip digital voltmeter V after linear rectification. The voltage is indicated by V, and the indication range of V is from 1.0V to 250V. Both positive and negative input voltages can display readings. In order to measure negative voltages, the four diodes on the amplifier A1 uniformly output the input voltage, whether positive or negative, into a positive voltage, so that normal measurement can be performed. When the operational amplifier A1 is used, the voltage drop of the diode is equivalent to 0, which does not affect the measurement accuracy.

[0037] The amplifier circuit includes an operational amplifier A2, resistors R21, R22, and R23; it can amplify the input voltage by 10 times and then output it, and supply it to the light-emitting diodes LED1 and LED2 through the resistor R24 ​​to indicate the polarity of the input signal; wherein, the amplifier circuit amplifies the voltage on R00, so that LED1 and LED2 emit light, and when it is a positive voltage, the IC circuit works and reports a voice signal.

[0038] The input signal polarity indication circuit includes a resistor R24, a light emitting diode LED1, and a light emitting diode LED2; when the input voltage signal is positive, the A2 operational amplifier outputs a positive potential, and the LED1 turns red, indicating that the input signal is positive. If the input voltage signal is negative, the A2 operational amplifier outputs a negative potential, and the LED2 turns blue, indicating that the input signal is negative.

[0039] The input positive polarity potential voice prompt signal alarm circuit includes a resistor R25, a transistor T, a single-chip integrated circuit chip IC that can record music, and a speaker SP; when the input signal is positive, A2 amplifies and outputs a high potential, which is added to the b-pole of the transistor T through the resistor R25. The c-pole of the transistor T is turned on to power the integrated circuit IC, and the IC plays the originally recorded voice signal "Protection outlet, beware of tripping!" to warn not to put in the protection outlet connection piece, otherwise it may cause an accident in the power grid or equipment.

[0040] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present invention.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the article or device including the elements.

[0042] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A multifunctional voltmeter for measuring safety protection connecting pieces, characterized in that: It includes an input signal detection circuit, a linear rectification circuit, an amplifying circuit, an input signal polarity indication circuit, an input positive polarity potential voice prompt signal alarm circuit, and a single-chip digital voltmeter. The input signal detection circuit is connected to the linear rectification circuit and the amplifying circuit respectively, the linear rectification circuit is further connected to the single-chip digital voltmeter, and the amplifying circuit is further connected to the input signal polarity indication circuit and the input positive polarity potential voice prompt signal alarm circuit respectively; The input signal detection circuit includes interfaces CK+, CK-, resistors R01, R00, the linear rectification circuit includes operational amplifier A1, resistors R11, R12, R13, diodes D1, D2, D3, D4, the amplification circuit includes operational amplifier A2, resistors R21, R22, R23, the input signal polarity indication circuit includes resistor R24, light emitting diode LED1, light emitting diode LED2, the input positive polarity potential voice prompt signal alarm circuit includes resistor R25, transistor T, single-ended transistor capable of recording music The integrated circuit chip IC and the speaker SP are provided, the interfaces CK+ and CK- are respectively connected to the positive and negative electrodes of the input signal, the interface CK+ is respectively connected to 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 to 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 to 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 to the inverting input end of the operational amplifier A1, and the resistor R1 The second end of resistor R21 is connected to the positive input terminal of operational amplifier A2 and the first end of resistor R23, the second end of resistor R22 is connected to the inverting input terminal of operational amplifier A2, and the second end of resistor R23 is connected to the negative input terminal of operational amplifier A2. The first end of the resistor R24, the first end of the resistor R25, and the output end of the operational amplifier A2 are respectively connected. The second end of the resistor R24 ​​is respectively connected to the positive electrode of the light-emitting diode LED1 and the negative electrode of the light-emitting diode LED2. The negative electrode of the light-emitting diode LED1 and the positive electrode of the light-emitting diode LED2 are both grounded. The second end of the resistor R25 is connected to the base of the transistor T. The emitter of the transistor T is grounded. The collector of the transistor T is connected to the power supply through a single-chip integrated circuit chip IC that can record music. The single-chip integrated circuit chip IC that can record music is also connected to the speaker SP.

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