CN104793132B - Disconnecting switch contact condition detection device and detection method based on electric-field sensor - Google Patents

Disconnecting switch contact condition detection device and detection method based on electric-field sensor Download PDF

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CN104793132B
CN104793132B CN201510190661.XA CN201510190661A CN104793132B CN 104793132 B CN104793132 B CN 104793132B CN 201510190661 A CN201510190661 A CN 201510190661A CN 104793132 B CN104793132 B CN 104793132B
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field sensor
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CN104793132A (en
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黄新波
石杰
张�浩
郭剑锋
邓凸
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Xian Polytechnic University
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Abstract

The invention discloses the disconnecting switch contact condition detection devices based on electric-field sensor, including dsp processor unit, DSP reseting modules, DSP crystal oscillator modules, LCD MODULE, start button, barricade are also respectively connected on dsp processor unit and opens button, warning module, light-coupled isolation module, A/D modular converters, Signal-regulated kinase is also respectively connected in light-coupled isolation module, it is also connected with adaptive amplification module, electric field signal extraction module, electric-field sensor on A/D modular converters in turn, Temperature Humidity Sensor is also associated on Signal-regulated kinase.The invention also discloses the detection methods based on above-mentioned detection device.The present invention realizes complete electrical isolation, effectively ensures requirement of the electric system detection field for insulation performance.The present invention can obtain the contact condition of disconnecting switch, and carry out early warning processing, while the parameters such as voltage, environment can be shown.

Description

Disconnecting switch contact condition detection device and detection method based on electric-field sensor
Technical field
The invention belongs to power transmission and transforming equipment offline inspection technical fields, are related to a kind of disconnecting switch based on electric-field sensor Contact condition detection device, the invention further relates to a kind of detection methods based on above-mentioned detection device.
Background technology
Electric power transmission line and substation be in order to which the electric power energy in power plant is conveyed to user, it is continuous with technology Progress, requirement of the user for power quality increasingly improve, and power quality includes voltage swing, frequency and waveform, these It is unconspicuous to influence for the caused influence of relative system phase shortage.Open-phase operation will make a big impact to system, by In three-phase current unbalance, the indivedual windings of generator, transformer may be made to pass through electric current larger, cause superheating phenomenon, according to statistics, In various works, agricultural production in asynchronous motor failure, due to power supply break phase, certain phase winding broken string and be burned out motor Account for it is more than half;The negative sequence component electric current that three-phase current unbalance generates makes generator unit stator winding generate negative phase-sequence rotary magnetic , the alternating current induced in rotor windings causes added losses;And the magnetic field interaction generated with rotor windings, Cause unit vibration;The zero-sequence current generated during open-phase operation can generate interference etc. to neighbouring communication line.Therefore electric power System phase-deficient operation should cause the enough attention of vast work about electric power personnel, not allow such case preferably, when that occurs, It then needs system to be made to be restored to normal operation as early as possible.
Disconnecting switch is most commonly used a kind of high-tension apparatus in high-voltage switch electric appliance, is substantially all and matches with high-voltage circuitbreaker It closes and uses.The principles and structure of itself is fairly simple, but big due to the use of amount, and functional reliability requirement is high, to becoming The influence of design, construction and the safe operation in power station is larger.
There may be three kinds of states between the dynamic/static contact of disconnecting switch, first, being significantly present of compartment between two contacts Gap shows that disconnecting switch is fully disconnected at this time;Second is that being closed completely between two contacts, show that disconnecting switch both sides are complete at this time It is complete to connect;Third, seemed between two contacts closure disconnect actually, at this time to the impression of staff be exactly disconnecting switch be closed , however in fact it is to disconnect, i.e., can not be completed power supply to follow-up system.The third situation is difficult to know due to staff Feelings and its harm is caused to be the largest, be a most important reason for causing phase shortage, mainly due to isolation switch contact burn Wound loosened screw causes loose contact or is not in contact with, so as to cause a certain phase not for powering on.However in power transformation The scene of standing, these loose contacts or situation about not contacting can't see, so as to the voltage feelings of disconnecting switch outgoing line side Condition has no way of learning, therefore for field operator and patrol officer in substation field, it is necessary to which disconnecting switch is connect Tactile state is detected.
The contact condition of disconnecting switch is judged the present invention is based on disconnecting switch outgoing line side voltage condition.Circuit breaking Afterwards, for non-faulting phase, voltage and current can increase accordingly, this proposes test for the dielectric level of equipment, Threat is also constituted to personnel safety simultaneously, so the system open-phase operation time cannot be too long, it should be made to restore normal as early as possible. The present invention is detected the outgoing line side voltage of disconnecting switch with electric-field sensor, such as finds system open-phase operation, then may be used It is handled, is using electric-field sensor main advantage accordingly immediately:First, realizing complete heed contacted measure, ensure that Safety during detection;Second is that electric-field sensor is cheap, the cost of device is greatlyd save.
Invention content
The object of the present invention is to provide a kind of disconnecting switch contact condition detection devices based on electric-field sensor, can facilitate Live acquisition is carried out to the voltage condition of disconnecting switch outgoing line side.
The present invention also aims to provide a kind of detection method of the disconnecting switch contact condition based on electric-field sensor.
The first technical solution of the present invention is the disconnecting switch contact condition detection dress based on electric-field sensor It puts, including dsp processor unit, DSP reseting modules, DSP crystal oscillator modules, liquid crystal is also respectively connected on dsp processor unit Display module, start button, barricade open button, warning module, light-coupled isolation module, and light-coupled isolation module is also respectively connected with There are A/D modular converters, Signal-regulated kinase, be also connected with adaptive amplification module in turn on A/D modular converters, electric field signal carries Modulus block, electric-field sensor are also associated with Temperature Humidity Sensor on Signal-regulated kinase.
The characteristics of the first technical solution of the present invention, also resides in,
Dsp processor unit is also associated with SRAM memory modules.
Dsp processor unit is also associated with communication module.
Second of technical solution of the present invention is the disconnecting switch contact condition detection side based on electric-field sensor Method is specifically implemented according to the following steps:
Step 1, electric-field sensor are placed in the underface of disconnecting switch outlet, and electric-field sensor will sense that three-phase is superimposed upon Electric field signal together, and the electric field signal sensed is converted into voltage signal by electric-field sensor, and voltage signal passes through electricity Field signal extraction module extracts, and is then fed into adaptive amplification module, and adaptive amplification module is amplified to signal suitable The input voltage range of A/D modular converters requirement, is then fed into A/D modular converters, and DSP is sent into finally by light-coupled isolation module Processor unit;Temperature Humidity Sensor by the humiture information of collected surveyed environment by Signal-regulated kinase after, pass through Light-coupled isolation module is sent into dsp processor unit;
Step 2, dsp processor unit carry out Fast Fourier Transform to the voltage signal of discretization, and transformation obtains voltage Value, dsp processor unit can the discrimination principles based on disconnecting switch contact condition, in combination with the voltage feelings of different voltages grade Condition determines the contact condition of isolation isolation switch contact according to surveyed voltage swing;When being determined as phase shortage, carry out at alarm Reason, and the information such as phase shortage, voltage and environmental parameter are shown on Liquid Crystal Module, while press barricade opening button and continue Separate identification.
The characteristics of second of technical solution of the present invention, also resides in,
A/D moduluss of conversion sample frequency f in the block in step 1sIt is set by dsp processor unit by following formula:
fs=fN/512
Wherein, fN=50Hz is power frequency, and 512 acquire 512 points for each period.
Dsp processor unit carries out Fast Fourier Transform to the voltage signal of discretization in step 2, specifically according to following Step is implemented:
The voltage signal discrete series obtained after A/D modular converters are x (n), and 0≤n≤N-1, N are sampling number, k For the number of harmonic wave, Discrete Fourier Transform processing is carried out to x (n) sequences:
It may thus be appreciated that the real and imaginary parts of signal are respectively:
The discrimination principles of disconnecting switch contact condition are in step 2:It is superimposed for three that electric-field sensor surveys electric field signal A signal, when electric-field sensor is positioned over immediately below a certain phase conductor, due to away from three-phase conducting wire electrical distance all farther out, So electric-field sensor for three-phase conducting wire response voltage difference away from very little, and phase is also mutual 120 ° of difference, is existed in this way During disconnecting switch normally closed, electric-field sensor will form a little voltage U1;When a certain phase contact is not closed, Remaining other two-phase voltage synthesis one larger voltage U2, voltage U1 when U2 is significantly greater than normal;When certain two-phase contact does not have When having closure, remaining other phase voltage U3, voltage U3 is more smaller than U2, voltage U1 when U3 is more than normal;And when three-phase contact When not all being closed, just without electric field signal, it is almost nil to survey voltage value U4, has integrated U2 for rear end>U3>U1>U4.
When phase shortage is determined as in step 2, separate identification method is:Disconnecting switch based on electric-field sensor is contacted into shape State detection device is placed in below circuit, opens disconnecting switch contact condition detection device both sides and conducting wire based on electric-field sensor Two pieces of parallel metal shielding boards, are detected a certain phase, and electric field signal is shielded substantially caused by other two-phase at this time, Measured signal is exactly the reflection to this phase voltage substantially, when being not in contact with as originally isolating switch contact, surveys voltage value with regard to base Originally it is zero, and when isolation switch contact contact is good, it is suitable with U3 to survey voltage value.
The beneficial effects of the invention are as follows:The present invention is based on the disconnecting switch contact condition detection device uses of electric-field sensor Dsp processor unit realizes the acquisition to disconnecting switch outgoing line side voltage signal, mainly voltage signal is carried out as processor A/D samplings, FFT processing, are then analyzed according to discrimination principles.When a certain contact for isolating switch is not closed, Outgoing line side just without voltage, can carry out corresponding early warning processing, while be designed with liquid crystal display at this time, can show voltage, The information such as humiture, so that work about electric power personnel can quickly exclude disconnecting switch problem, complete normal power supply, can effectively prevent Only high-tension apparatus or electrical equipment are because of serious consequence caused by phase-deficient operation.
Description of the drawings
Fig. 1 is the structure diagram of disconnecting switch contact condition detection device of the present invention;
Fig. 2 is the structure diagram of electric-field sensor in the present invention.
In figure, 1. electric-field sensors, 2. electric field signal extraction modules, 3. adaptive amplification modules, 4.A/D modular converters, 5. light-coupled isolation module, 6. Temperature Humidity Sensors, 7. Signal-regulated kinases, 8.DSP reseting modules, 9.DSP crystal oscillator modules, 10.DSP processor units, 11.SRAM memory modules, 12. LCD MODULEs, 13. start buttons, 14. barricades opening are pressed Button, 15. warning modules, 16. communication modules, 17. top crowns, 18. bottom crowns, 19. dielectrics, 20. signal wires, 21. conducting wires Fixing card.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
The present invention is based on the disconnecting switch contact condition detection devices of electric-field sensor, and structure is as shown in Figure 1, including DSP DSP reseting modules 8, DSP crystal oscillator modules 9, SRAM storages are also respectively connected on dsp processor unit 10 for processor unit 10 Module 11, LCD MODULE 12, start button 13, barricade open button 14, warning module 15, communication module 16, optocoupler Isolation module 5, light-coupled isolation module 5 are also respectively connected A/D modular converters 4, Signal-regulated kinase 7, on A/D modular converters 4 It is also connected with adaptive amplification module 3, electric field signal extraction module 2, electric-field sensor 1 in turn, also connects on Signal-regulated kinase 7 It is connected to Temperature Humidity Sensor 6.
Wherein 1 main function of electric-field sensor is that disconnecting switch outgoing line side voltage is monitored.Select electric-field sensor 1 Sharpest edges be cheap and easy for installation, as long as in being placed on the electric field that disconnecting switch outgoing line side voltage is formed i.e. It can.Simultaneously complete electrical isolation is entirely realized between measuring system and primary equipment, effectively ensure electric system for The requirement of insulation performance.Electric-field sensor 1 is capacitive battery field sensor in the present invention, and structure is as shown in Fig. 2, including top crown 17 and bottom crown 18 and central filler dielectric 19, the surface of electric-field sensor 1 be connected with conducting wire fixing clip 21, conducting wire is solid Draw signal wire 20 on fixed card, the voltage between upper and lower two-plate is drawn by signal wire 20, is sent into subsequent voltage signal extraction Module carries out the extraction of voltage.The operation principle of capacitive battery field sensor 1 is:Top crown 17 and bottom crown 18 are placed in and keep apart It closes in the power frequency electric field that outgoing line side voltage is formed, it will assemble the positive and negative charge of power frequency variation respectively, due to the work of these charges With, between two-plate just formed voltage, this voltage can be extracted by some way.The two poles of the earth up and down of electric-field sensor 1 Plate is equal in magnitude, composition is identical, and material uses metallic iron, and shape can be round and rectangular.Intermediate dielectric is adopted With glass or other suitable materials.The signal wire that upper and lower two-plate is drawn is using the cable of included shielded layer, inner core Using copper material, resistance is small, conducts electricity very well, and can carry out the transmission of signal well.
Wherein electric field signal extraction module 2 is mainly to apply the principle of instrumentation amplifier, front end shunt capacitance again with electricity The signal that field sensor 1 comes out is connected, and voltage signal can be got on shunt capacitance, at this time the input electricity of instrumentation amplifier Resistance is chosen to be more than megaohm rank, can substantially accurately extract voltage signal.
Wherein adaptive amplification module 3 uses programmable gain amplifier PGA204, feature be precision it is high, it is digital control can Program gain.By program according to input voltage size automatic control signal amplification factor, level Four amplification factor is divided into, there is control The advantages that system is flexibly, the linearity is high, reliable and stable.
The ADS8505 that wherein A/D modular converters 4 use for main devices, from sample rate, precision may be used by ADS8505 Meets the needs of apparatus of the present invention.
Wherein 5 main function of light-coupled isolation module is to carry out isolation guarantor to the numerical portion and analog portion of entire circuit The main devices as light-coupled isolation such as 6N137 chips, HCPL0630 chips can be selected in shield, system.
Wherein Temperature Humidity Sensor 6 selects Switzerland Sensirion companies SHTxx series of products SHT11 to be passed as humiture Sensor, the sensor mainly include a temperature-sensing element (device) and a humidity sensing element, can facilitate to temperature and humidity It measures.
Wherein 8 main function of DSP reseting modules be influenced by factors such as external interferences in dsp processor unit 10, program Race flies that equipment is caused to carry out reset processing to system when can not work normally.System is used as using CAT1832V-GT3 chips and guarded the gate Dog circuit main control chip carries out reset operation by be configured that push-button unit can also be artificially to system in addition.
Wherein DSP crystal oscillator modules 9 provide clock for dsp system work, using the external crystal oscillator of 30M.
Wherein dsp processor unit 10 has selected the TMS320F28335 models of TI companies, have speed is fast, precision is high, The advantages that at low cost, small power consumption, performance are good, peripheral hardware integrated level is high, amount of storage is big can realize the processing to signal well.
Wherein 11 main function of SRAM memory modules is the intermediate data stored in dsp system operational process, and device uses IS61LV51216 chips have the advantages that speed is fast, need not coordinate memory refresh circuit, can improve whole working efficiency.
Wherein 12 main function of LCD MODULE is that the information such as voltage, frequency and environmental parameter are shown, dress It puts using 12864 dot matrix lcd modules.
Wherein 15 main function of warning module is, when detecting that isolation switch contact is not closed complete, it will carry Wake up field personnel, and to properly settle problem, device is using the audible-visual annunciator of model YS-01 as warning module 15。
Wherein communication module 16 by data mainly for being uploaded to power grid background monitoring center, to meet the big back of the body of intelligent grid The high-tension apparatus running state analysis carried out under scape.The modes such as 3G, ZigBee, WiFi can be selected in communication module.
The discrimination principles of disconnecting switch contact condition are in the present invention:Electric-field sensor 1 is surveyed electric field signal and is stacked for three The signal added, when electric-field sensor 1 is positioned over immediately below a certain phase conductor, due to away from three-phase conducting wire electrical distance all compared with Far, thus electric-field sensor 1 for three-phase conducting wire response voltage difference away from very little, and phase is also mutual 120 ° of difference, this For sample in disconnecting switch normally closed, electric-field sensor 1 will form a little voltage U1;When a certain phase contact does not close During conjunction, remaining other two-phase voltage synthesis one larger voltage U2, voltage U1 when U2 is significantly greater than normal;When certain two is touched When head is not closed, remaining other phase voltage U3, voltage U3 is more smaller than U2, voltage U1 when U3 is more than normal;And work as three-phase When contact is not all closed, just without electric field signal, it is almost nil to survey voltage value U4, has integrated U2 for rear end>U3>U1> U4。
It is separate when i.e. non-three phase (phase shortage) is run when having detected that a phase or two-phase isolation switch contact are not in contact with Identification method be:Disconnecting switch contact condition detection device based on electric-field sensor is placed in below circuit, opening is based on The disconnecting switch contact condition detection device both sides of the electric-field sensor two piece metal shielding boards parallel with conducting wire, to a certain phase into Row detection, electric field signal is shielded substantially caused by other two-phase at this time, and measured signal is exactly to the anti-of this phase voltage substantially It reflects, when being not in contact with as originally isolating switch contact, surveys voltage value with regard to substantially zeroed, and it is good in isolation switch contact contact When, it is suitable with U3 to survey voltage value.
The present invention is based on the disconnecting switch contact condition detection methods of electric-field sensor, are specifically implemented according to the following steps:
Step 1, electric-field sensor 1 are placed in the underface of disconnecting switch outlet, and electric-field sensor 1 will sense that three is superimposed Electric field signal together, and the electric field signal sensed is converted into voltage signal by electric-field sensor 1, and voltage signal passes through Electric field signal extraction module 2 extracts, and is then fed into adaptive amplification module 3, and adaptive amplification module 3 is amplified to signal It is suitble to the input voltage range of 4 requirement of A/D modular converters, A/D modular converters 4 is then fed into, finally by light-coupled isolation module 5 It is sent into dsp processor unit 10;The humiture information of collected surveyed environment is passed through signal condition mould by Temperature Humidity Sensor 6 After block 7, dsp processor unit 10 is sent by light-coupled isolation module 5;
Wherein, the sample frequency f in A/D modular converters 4sIt is set by dsp processor unit 10 by following formula:
fs=fN/512 (1)
Wherein, fN=50Hz is power frequency, and 512 acquire 512 points for each period.
Step 2, dsp processor unit 10 carry out Fast Fourier Transform to the voltage signal of discretization:
The voltage signal discrete series obtained after A/D modular converters 4 are x (n), and 0≤n≤N-1, N are sampling number, K is the number of harmonic wave, and Discrete Fourier Transform processing is carried out to x (n) sequences:
It may thus be appreciated that the real and imaginary parts of signal are respectively:
Transformation obtains voltage value Um, discrimination principles of the meeting of dsp processor unit 10 based on disconnecting switch contact condition, simultaneously With reference to the voltage condition of different voltages grade, the contact condition of isolation isolation switch contact is determined according to surveyed voltage swing, i.e., Voltage value UmIt is compared with U1, U2, U3, U4;If 1. UmClose to U1, then disconnecting switch normally closed, 2. if UmIt is close U4, then disconnecting switch three-phase contact be not all closed, 3. if UmClose to U2, then there is a phase contact not to be closed, 4. if UmIt connects Nearly U3, then two-phase contact be not closed;When being determined as phase shortage (lack a phase or two-phase i.e. 3., 4. two kinds of situations), reported Alert processing, and the information such as phase shortage, voltage and environmental parameter are shown on Liquid Crystal Module, while press barricade and open button continuation Carry out separate identification:If showing that this isolates switch contact normally closed when measuring this phase voltage close to U3, if this Show that this isolates switch contact and is not closed when phase voltage is close to zero.
As needed, institute's measured data can be uploaded to power grid background monitoring center, analyzed for use as quality of voltage.
In the present invention, disconnecting switch outgoing line side voltage is detected using electric-field sensor 1, cheap, installation side Just, while complete electrical isolation is entirely realized between detection device and primary equipment, effectively ensures power system measuring Requirement of the field for insulation performance.Monitoring terminal, as processor, makes full use of DSP processing using dsp processor unit 10 The characteristics of quick computing capability of device unit 10, is being acquired signal while scene is digitized processing, and calculate To parameter informations such as voltage magnitude, virtual values, live early warning can be carried out, while can show voltage and ambient parameter information.

Claims (4)

1. the disconnecting switch contact condition detection method based on electric-field sensor, which is characterized in that using based on electric-field sensor Disconnecting switch contact condition detection device, concrete structure is:
Including dsp processor unit (10), it is brilliant that DSP reseting modules (8), DSP are also respectively connected on dsp processor unit (10) Module of shaking (9), LCD MODULE (12), start button (13), barricade open button (14), warning module (15), optocoupler A/D modular converters (4), Signal-regulated kinase (7), A/D conversions is also respectively connected in isolation module (5), light-coupled isolation module (5) Also it is connected with adaptive amplification module (3), electric field signal extraction module (2), electric-field sensor (1), signal in module (4) in turn Temperature Humidity Sensor (6) is also associated in conditioning module (7);
It is specifically implemented according to the following steps:
Step 1, electric-field sensor (1) are placed in the underface of disconnecting switch outlet, and electric-field sensor (1) will sense that three is superimposed Electric field signal together, and the electric field signal sensed is converted into voltage signal by electric-field sensor (1), and voltage signal leads to It crosses electric field signal extraction module (2) to extract, is then fed into adaptive amplification module (3), adaptive amplification module (3) is letter The input voltage range of suitable A/D modular converters (4) requirement number is amplified to, is then fed into A/D modular converters (4), finally by Light-coupled isolation module (5) is sent into dsp processor unit (10);Temperature Humidity Sensor (6) is warm and humid by collected surveyed environment After spending information by Signal-regulated kinase (7), dsp processor unit (10) is sent by light-coupled isolation module (5);
Step 2, dsp processor unit (10) carry out Fast Fourier Transform to the voltage signal of discretization, and transformation obtains voltage Value, discrimination principles of dsp processor unit (10) meeting based on disconnecting switch contact condition, in combination with the electricity of different voltages grade Pressure situation determines the contact condition of isolation isolation switch contact according to surveyed voltage swing;When being determined as phase shortage, alarm Processing, and phase shortage, voltage and ambient parameter information are shown on Liquid Crystal Module, while press barricade opening button and continue Separate identification;The discrimination principles of disconnecting switch contact condition are in the step 2:Electric-field sensor (1) surveys electric field signal A signal superimposed for three, when electric-field sensor (1) is positioned over immediately below a certain phase conductor, due to away from three-phase conducting wire electricity Gas distance all farther out, so electric-field sensor (1) for three-phase conducting wire response voltage difference away from very little, and phase is also mutual 120 ° of difference, in this way in disconnecting switch normally closed, electric-field sensor (1) will form a little voltage U1;When certain When one phase contact is not closed, remaining other two-phase voltage synthesizes a larger voltage U2, electric when U2 is significantly greater than normal Press U1;When certain two-phase contact is not closed, remaining other phase voltage U3, voltage U3 is more smaller than U2, when U3 is more than normal Voltage U1;And when three-phase contact is not all closed, just without electric field signal, it is almost nil to survey voltage value U4 for rear end, comprehensive Get up to have U2>U3>U1>U4.
2. the disconnecting switch contact condition detection method according to claim 1 based on electric-field sensor, which is characterized in that Sample frequency f in the step 1 in A/D modular converters (4)sIt is set by dsp processor unit (10) by following formula:
fs=fN/512
Wherein, fN=50Hz is power frequency, and 512 acquire 512 points for each period.
3. the disconnecting switch contact condition detection method according to claim 1 based on electric-field sensor, which is characterized in that Dsp processor unit (10) carries out Fast Fourier Transform to the voltage signal of discretization in the step 2, specifically according to following Step is implemented:
The voltage signal discrete series obtained after A/D modular converters (4) are x (n), and 0≤n≤N-1, N are sampling number, k For the number of harmonic wave, Discrete Fourier Transform processing is carried out to x (n) sequences:
It may thus be appreciated that the real and imaginary parts of signal are respectively:
The real part of voltage signal is:
Imaginary part is:
Therefore the size of voltage signal is:
4. the disconnecting switch contact condition detection method according to claim 1 based on electric-field sensor, which is characterized in that When being determined as phase shortage in the step 2, separate identification method is:Disconnecting switch contact condition based on electric-field sensor is examined It surveys device to be placed in below circuit, it is parallel with conducting wire to open the disconnecting switch contact condition detection device both sides based on electric-field sensor Two pieces of metal shielding boards, a certain phase is detected, electric field signal is shielded substantially caused by other two-phase at this time, is surveyed Signal is exactly the reflection to this phase voltage substantially, when being not in contact with as originally isolating switch contact, surveys voltage value and is just essentially Zero, and when isolation switch contact contact is good, it is suitable with U3 to survey voltage value.
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