CN207424193U - A kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach - Google Patents
A kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach Download PDFInfo
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- CN207424193U CN207424193U CN201721108627.4U CN201721108627U CN207424193U CN 207424193 U CN207424193 U CN 207424193U CN 201721108627 U CN201721108627 U CN 201721108627U CN 207424193 U CN207424193 U CN 207424193U
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- buchholz relay
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- pressure sensor
- chip computer
- flow velocity
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Abstract
The utility model discloses a kind of Buchholz relay on-site calibration devices based on piezoelectricity transformation approach, including pressure sensor block, modulus dress mold changing block, power module, one-chip computer module, buzzer and LCD flow velocity display modules, the power module is connected directly with one-chip computer module, one-chip computer module is also respectively connected with buzzer and LCD flow velocity display modules, pressure sensor block is connected after being connected with analog-to-digital conversion module with one-chip computer module again, the flow velocity dress of Buchholz relay is changed to pressure by the utility model, pressure dress is changed to electric signal again, pass through actuating of relay value and the fit correlation curve of flow velocity, the quick size for calculating Buchholz relay action flow speed value.The utility model completes the electronization of Buchholz relay calibration equipment, and device volume is compact, light-weight, only 200g, substitutes the Buchholz relay method of calibration of traditional pump type oil, realizes the purpose of Buchholz relay field-checking.
Description
Technical field
The utility model is related to a kind of calibration equipments, are specifically a kind of Buchholz relay scene school based on piezoelectricity transformation approach
Experiment device.
Background technology
Buchholz relay is a kind of protective device used in transformer, the pipeline between the conservator and fuel tank of transformer
It is interior, when making oil decomposition generation gas using power transformer interior fault or causing oil flow surge, the contact of relay is acted, is connect
The logical control loop specified, and signal alarm is sent in time or starting protection element cuts off transformer automatically.
The method of calibration of traditional Buchholz relay action flow velocity setting valve, verifies using pump type oil Buchholz relay
Platform goes the internal fault of analogue transformer with oil stream.When oil flow rate constantly increases in checking table, oil stream impact Buchholz relay is kept off
Plate so that spring deforms upon.Baffle inflection point constantly increases, and drawing force constantly increases suffered by spring, and oil flow rate reaches
Buchholz relay acts rapidly when acting flow velocity setting valve.After detection, check that checking table oil flow rate size can verify watt
The reliability and sensitivity of this actuating of relay.And there is the shortcomings that several aspects in the method：
1. Buchholz relay is unable to field-checking, it is long that verification expends the cycle.Traditional pump type oil gas relay is used at present
Device is verified, and 2.3 tons of equipment is put in laboratory., it is necessary to which the Buchholz relay on transformer is removed band in maintenance process
Verification is returned, working site installation is taken back after the completion of verification again, expends long time period, delay the repair time, influence electric system
Safe and stable operation.
2. it is dismounted often in checking procedure.In checking procedure, due to being unsatisfactory for adjusting definite value requirement, one watt is completed
This relay checking there is a situation where to repeat dismounting adjustment, and average dismounting reaches 4.3 times, every time the time of dismounting consumption be about
25 minutes, inefficiency.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of Buchholz relay scene schools based on piezoelectricity transformation approach
Experiment device, to solve the problems, such as to mention in background technology.
To achieve the above object, the utility model provides following technical solution：
A kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach is changed including pressure sensor block, modulus dress
Module, power module, one-chip computer module, buzzer and LCD flow velocity display modules, the power module and one-chip computer module are direct
It is connected, one-chip computer module is also respectively connected with buzzer and LCD flow velocity display modules, pressure sensor block and analog-to-digital conversion module phase
Lian Houzai is connected with one-chip computer module.
Further scheme as the utility model：The pressure sensor block include four strain resistor device R1, R2,
R3, R4, headtotail is composed in series bridge-type sensor circuit successively by R1, R2, R3, R4, and from the tie point of R1, R2, R3, R4's
Tie point draws the node as voltage V respectively；From the tie point of R1, R4, the tie point of R2, R3 pass through a current limliting electricity respectively
Hinder node of the Rm extractions as induced voltage e.
Further scheme as the utility model：The pressure sensor block the 1st, 2,3 pins respectively with modulus
Conversion chip HX711 the 16th, 5,7 pins be connected directly, the 4th pin of pressure sensor module is connected with current-limiting resistance R8
Afterwards, then with the 8th pin of modulus conversion chip HX711 it is connected.
Further scheme as the utility model：The one-chip computer module includes XTAL crystal oscillators and STC89C51 cores
Piece, the both ends of XTAL crystal oscillators are connected in parallel between the 19th of STC89C51 chips the, 18 pins, and respectively by C2, C3 respectively with electricity
Source cathode is connected.
Compared with prior art, the beneficial effects of the utility model are：The utility model fills the flow velocity of Buchholz relay
Pressure is changed to, then pressure dress is changed to electric signal, by actuating of relay value and the fit correlation curve of flow velocity, is quickly calculated
Buchholz relay acts the size of flow speed value.The utility model completes the electronization of Buchholz relay calibration equipment, device volume
Compact, light-weight, only 200g substitutes the Buchholz relay method of calibration of traditional pump type oil, realizes Buchholz relay scene school
The purpose tested.Meanwhile the use of the utility model, the input of pump type oil gas-actuated relay calibration stand has been saved, has prevented verification
The loss of oil, has saved cost；Checking process is optimized, reduces the number that Buchholz relay repeats dismounting adjustment, by gas
Machine relay dismounting number is reduced to 1 time, improves Buchholz relay verification efficiency, and thoroughly solving Buchholz relay cannot live school
The problem of testing with being dismounted often in checking procedure.
Description of the drawings
Fig. 1 is the principle schematic of the utility model；
Fig. 2 is the pressure sensor block of the utility model；
Fig. 3 is the analog-to-digital conversion module of the utility model；
Fig. 4 is the power module of the utility model；
Fig. 5 is the singlechip control chip module of the utility model；
Fig. 6 is the display module of the utility model；
Fig. 7 is the instrumentation plan of the utility model；
Fig. 8 is the outer casing construction drawing of the utility model；
Fig. 9 is the cut-away view of the utility model；
In Fig. 8,1 is liquid crystal display, and 2 be signal lamp, and 3 be power switch, and 4 be signalizing activity reset button, 5
For pressure sensor signal wiring hole.
In Fig. 9,6 be PCB circuit board, and 7 be 4 section 1.5V battery folders.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
- 9 are please referred to Fig.1, a kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach is by pressure sensing mould
Block, modulus dress mold changing block, power module, singlechip control chip module, display module, crust of the device are formed.Wherein power supply
Module is connected directly with singlechip control chip module, and display module is connected directly with control chip, pressure sensor block and mould
Number modular converter is connected after being connected with singlechip control chip again.
Pressure sensor block says the size that pressure conversion is corresponding analog electrical signal after the size of pressure is experienced.Such as
Shown in attached drawing 2, pressure sensor block is in series by tetra- strain resistor devices of R1, R2, R3, R4 successively headtotail, constitutes
Bridge-type sensor circuit.And from the tie point of R1, R2, the tie point of R3, R4 draw 1 as voltage V, 3 pin nodes respectively；From
The tie point of R1, R4, the tie point of R2, R3 are used as 2,4 pins of induced voltage e by a current-limiting resistance Rm extraction respectively
Node.When pressure sensor experiences pressure change, power supply introduces the pressure sensing of bridge type by the 1st, 3 pins
Device so that the electric signal consistent with pressure change is sensed on 2,4 pins, is used for analog-to-digital conversion module.
Analog-to-digital conversion module mainly includes HX711 chips, switching transistor 8550, filter capacitor C4, C5, C6, C7, coupling
Capacitance C8, divider resistance R12, R13 are closed, current-limiting resistance R8, R9 are formed.As shown in Figure 3, wherein the 16th, the 1 of HX711 chips
Number pin is connected directly with positive pole.Filter capacitor C6 is connected in parallel on power positive cathode both ends, and filter capacitor C7 is connected in parallel on HX711
The the 3rd, No. 5 pin both ends.Filter capacitor C4, C5 are connected in parallel on the 7th, 8 and 9 of HX711, No. 10 pin both ends respectively.Partial pressure electricity
Resistance R12, R13 are connected on the 3 of HX711 chips, 5 foot both ends, and current-limiting resistance is connected in the 7th of HX711 chips the, No. 8 pin.Mould
The principle of number conversion is to say that analog electrical signal is converted to discrete digital signal.HX711 has the ability of rapid computations, when 7,8
When number pin receives the small-signal from pressure sensor, HX711 first amplifies faint analog electrical signal, then
Digital signal is converted into again, is sent to the 11st, No. 12 pin, is used for singlechip control chip.The work(of analog-to-digital conversion module
Can, it is connection pressure sensor and singlechip control chip, the dress for completing analog signal to digital signal changes.
Power module is by current-limiting resistance R13, Self-resetting button SW-PB, delay capacitor C1, drop-down electricity as shown in Figure 4
Resistance R3 is linked in sequence successively, and low-and high-frequency filter capacitor C8, C7 are connected in parallel on power positive cathode both ends composition.Pull down resistor R3 with
Among delay capacitor C1, reset signal RST is drawn.As ON switch SW-PB, power supply is sent to the anode of capacitance C1 by switch
And charge to it, it since capacitance is in charged state, being connected moment in circuit, the similar short circuit of capacitance so that RST is in high potential,
So that RST obtains the pulse signal of a high potential.But over time, the gradual saturation of C1 chargings, in DC circuit,
Capacitance is in short-circuit condition.Since the current potential drop-down of R3 acts on so that low potential is presented in RST.Therefore, the moment opened in switch,
Power module outputs a time very short positive pulse so that control chip obtains a reset signal.Meanwhile in order to reduce
Pollution of the pulse signal to power supply is mounted with high-frequency filter capacitor C8, low frequency filtering C7 in power module, absorb respectively due to
Supply harmonic caused by pulse oscillating ensures the normal operation of power module.
Singlechip control chip module contains STC89C51 microcontrollers, XTAL crystal oscillators capacitance, resonant capacitance C2, C3, multiple
Position indicator light LED1, power supply indicator LED2, low frequency switch pipe 8050, current-limiting resistance R6, R11, R13, buzzer FM.Wherein,
The both ends of XTAL crystal oscillators are connected in parallel between the 18th of STC89C51 chips the, 19 pins, and pass through resonant capacitance C2, C3 respectively with
Power cathode is connected.One end of current-limiting resistance is connected with the 35th pin of microcontroller, the base stage of the other end and low frequency switch triode
It is connected, collector and buzzer series connection power supply negative terminal, emitter are connected with power supply.Positive pole passes through current-limiting resistance respectively
R11, R13 are connected with two light emitting diodes, and the other end of two light emitting diodes is connected to the 39th, No. 38 of control chip respectively
Pin.
Display module is made of LCD1602 liquid crystal displays, brightness regulation rheostat RW1.The data port microcontroller of LCD
P2 mouths be connected carry out data transmission, No. 4 pin of LCD display is connected with the sliding end of slide rheostat RW1, to obtain
Different voltage parameters is obtained, to adjust the display brightness of display.
The operation principle of the utility model is：As illustrated shown in 7, in measurement, Buchholz relay is fixed first,
And be mounted on one end of pressure sensor on the oil stream baffle of Buchholz relay, the other end is connected with reinforcing rocking handle, and will pressure
The signal wire of force snesor is linked into calibration equipment.
As shown in Figure 4, button SW-PB is turned on the power switch, positive pole generates a positive arteries and veins by delay capacitor C1
Punching, singlechip control chip obtain an of short duration RST reset signal so that SCM program resets, memory is reset.At one section
Between after, microcontroller normal work, for next flow velocity computing prepare.
As shown in Figure 7, when manual rotation rocking handle, rocking handle generates pressure sensor one positive pressure, simulation
Oil stream in Buchholz relay normal operation.When the baffle of Buchholz relay is subject to the pressure from pressure sensor, baffle
Spring deforms upon so that oil stream baffle is subjected to displacement.Rocking handle constantly applies pressure, the gear of Buchholz relay to pressure sensor
Plate constantly deflects, when deflection angle is more than the definite value of Buchholz relay, Buchholz relay action, and ON Action circuit.At this point,
Pressure sensor experiences maximum pressure, and pressure is converted to analog signal by pressure sensor.Analog-to-digital conversion module HX711
Receive the signal magnitude from pressure sensor, be converted into the digit pulse that can be identified by microcontroller.
Singlechip control chip receives the digital pulse signal from analog-to-digital conversion, so as to obtain cell pressure
Size.Chip internal program is controlled to be calculated according to the curve matching of pressure-flow velocity, pressure at this time is obtained rapidly and corresponds to gas relay
The action flow velocity of device is worth size, and is shown on the liquid crystal panel of device.At this point, the actuating signal indicator light 2 in attached drawing 8
Flicker instruction Buchholz relay measurement terminates, and the alarm signal for having buzzer to send " drop-drop-drop ", reminds tester
Operation of recording data.
When measuring the working value of gas machine with setting valve is required not to be consistent, adjustment Buchholz relay oil stream baffle spring
Sensitive screw, to change the action flow speed value of Buchholz relay.Above-mentioned experiment is repeated again, until Buchholz relay action is whole
Definite value meets the requirements until definite value.
The utility model is instead of the Buchholz relay method of calibration of traditional pump type oil, the piezoelectricity conversion of applying electronic
Method develops a set of compact device, and light-weight, only 200g is easy to carry, realizes that Buchholz relay is torn open using this device
It verifies, achievees the purpose that Buchholz relay field-checking.Meanwhile the utility model optimizes checking process, reduces gas
Gas machine relay dismounting number is reduced to 1 time, improves verification efficiency, thoroughly solve by the number that relay is dismounted in checking table
The problem of certainly Buchholz relay is unable to dismount often in field-checking and checking procedure.
Claims (4)
1. a kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach, including pressure sensor block, modulus dress mold changing
Block, power module, one-chip computer module, buzzer and LCD flow velocity display modules, which is characterized in that the power module and monolithic
Machine module is connected directly, and one-chip computer module is also respectively connected with buzzer and LCD flow velocity display modules, pressure sensor block and modulus
Modular converter is connected after being connected with one-chip computer module again.
2. a kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach according to claim 1, feature exist
In the pressure sensor block includes four strain resistor devices R1, R2, R3, R4, and headtotail is connected successively by R1, R2, R3, R4
Bridge-type sensor circuit is formed, and from the tie point of R1, R2, the tie point of R3, R4 draw the node as voltage V respectively；From R1,
The tie point of R4, the tie point of R2, R3 are used as the node of induced voltage e by a current-limiting resistance Rm extraction respectively.
3. a kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach according to claim 2, feature exist
In, the pressure sensor block the 1st, 2,3 pins respectively with modulus conversion chip HX711 the 16th, 5, the direct phase of 7 pins
Even, after the 4th pin of pressure sensor module is connected with current-limiting resistance R8, then the 8th pin phase with modulus conversion chip HX711
Even.
4. a kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach according to claim 2, feature exist
In the one-chip computer module includes XTAL crystal oscillators and STC89C51 chips, and the both ends of XTAL crystal oscillators are connected in parallel on STC89C51 chips
The 19th, between 18 pins, and be connected respectively with power cathode by C2, C3 respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721108627.4U CN207424193U (en) | 2017-08-31 | 2017-08-31 | A kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721108627.4U CN207424193U (en) | 2017-08-31 | 2017-08-31 | A kind of Buchholz relay on-site calibration device based on piezoelectricity transformation approach |
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| CN207424193U true CN207424193U (en) | 2018-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954819A (en) * | 2019-12-17 | 2020-04-03 | 华北电力大学（保定） | Gas relay state identification method based on baffle corner and heavy gas signal |
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2017
- 2017-08-31 CN CN201721108627.4U patent/CN207424193U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954819A (en) * | 2019-12-17 | 2020-04-03 | 华北电力大学（保定） | Gas relay state identification method based on baffle corner and heavy gas signal |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Fan Jinze Inventor after: Zeng Wei Inventor after: Yang Fan Inventor after: Li Yin Inventor after: Wang Jie Inventor after: Qiu Xinghua Inventor after: Peng Juanjuan Inventor after: Cui Can Inventor after: Ding Xingyuan Inventor before: Fan Jinze |
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| CB03 | Change of inventor or designer information |