CN108535549A - A kind of hand-held three-phase transformer instrument for measuring DC resistance - Google Patents
A kind of hand-held three-phase transformer instrument for measuring DC resistance Download PDFInfo
- Publication number
- CN108535549A CN108535549A CN201810596437.4A CN201810596437A CN108535549A CN 108535549 A CN108535549 A CN 108535549A CN 201810596437 A CN201810596437 A CN 201810596437A CN 108535549 A CN108535549 A CN 108535549A
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- Prior art keywords
- phase
- test
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- current
- resistance
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
-
- 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
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
Abstract
The invention discloses a kind of hand-held three-phase transformer instrument for measuring DC resistance, it include the shell with hollow structure, it is bolted circuit board on the inner wall of the shell, display screen and control button are installed on the front of shell, three-phase current connecting terminal is respectively equipped on the circuit board, three-phase voltage connecting terminal, relay handover module, constant-current source circuit, central processing unit, AD analog-digital converters, human-computer interaction module and defencive function module, hand-held three-phase transformer instrument for measuring DC resistance of the present invention, DCR of Transformer test function, defencive function and human-computer interaction module are integrated in so small handheld instrument shell, automatically three-phase dc resistance and imbalance are tested out, working efficiency higher, precision higher, failure rate smaller, it is more intelligent, make test more convenient.
Description
Technical field
The present invention relates to test equipment technology, specially a kind of hand-held three-phase transformer instrument for measuring DC resistance.
Background technology
DCR of Transformer test, which is transformer interruption maintenance, must do project, in each Repair of Transformer have ten
Point important meaning, traditional test method can only be after a phase winding is completed in test, by p-wire reverse graft to another phase around
Then group carries out the test of the phase winding, increase the labor intensity and test period of testing crew, traditional test equipment volume
It is huge and heavy, need multiple person cooperational that could complete to test, inefficiency.
Invention content
The purpose of the present invention is to provide a kind of hand-held three-phase transformer instrument for measuring DC resistance, to solve above-mentioned background
It proposes bulky and heavy in technology, needs multiple person cooperational that could complete to test, the problems such as inefficiency.
To achieve the above object, the present invention provides the following technical solutions：
A kind of hand-held three-phase transformer instrument for measuring DC resistance includes the shell with hollow structure, the shell
It has been bolted circuit board on inner wall, display screen and control button are installed on the front of shell, divided on the circuit board
Not She You three-phase current connecting terminal, three-phase voltage connecting terminal, relay handover module, constant-current source circuit, central processing unit,
AD analog-digital converters, human-computer interaction module and defencive function module；
The circuit board is electrically connected by control line and display screen and control button；
The relay handover module includes current switching unit and voltage switch unit, and current switching unit and voltage are cut
The output end that the input terminal of unit connects with three-phase current connecting terminal and three-phase voltage connecting terminal respectively is changed to connect；
The human-computer interaction module includes liquid crystal display, keyboard unit and data storage cell, liquid crystal display list
The input terminal of member connects with the input terminal of central processing unit；
The liquid crystal display is also connect with display screen, for showing that D.C. resistance test, test data are inquired, in real time
The menu of clock setting and system parameter setting；
The output end of the keyboard unit connects with the input terminal of central processing unit, and keyboard unit also connects with control button
It connects, is used for all operations of controller unit；
The data storage cell is connected with central processing unit, for storing test data to the machine or in flash disk, together
When also can out of the machine or flash disk read test data information；
The defencive function module includes that signal acquisition module, breaking protection module and power failure protection module, signal are adopted
Collection module input terminal connect with current switching unit and voltage switch unit, signal acquisition module, breaking protection module and
The output end of power failure protection module connects with AD analog-digital converters；
The signal and filtering that the signal acquisition module acquisition current switching unit and voltage switch unit obtain are isolated
Effective signal；
The AD analog-digital converters are sent to central processing unit, central processing for converting analog signals into digital signal
Device arranges test result calculations, is output to human-computer interaction module；
The output end of the central processing unit connects with constant-current source circuit, output end and the current switching list of constant-current source circuit
Member connection；
The constant-current source circuit passes through the current switching channel of relay handover module for testing required test electric current
Current transmission will be tested to three-phase current connecting terminal；
Preferably, the three-phase current connecting terminal and three-phase voltage connecting terminal are believed with the electric current of three-phase transformer respectively
Number and the output end of voltage signal connect.
Preferably, the breaking protection module breaking protection function i.e. during the test, encounters test loop and goes out suddenly
Existing breakpoint, such as testing clamp poor contact disconnect, and to generate very high inverse electromotive force, should have discharge loop to protect instrument
It not being damaged, power failure protection module in open state or test process, meets emergency situations by chance and system power supply is caused to fail,
The self-protection function of instrument.
Compared with prior art, the beneficial effects of the invention are as follows：
This hand-held three-phase transformer instrument for measuring DC resistance, DCR of Transformer test function, defencive function and people
Machine interactive module is integrated in so small handheld instrument shell, tests out three-phase dc resistance and imbalance, working efficiency automatically
It is higher, precision higher, failure rate smaller, more intelligent, make test more convenient.
Description of the drawings
Fig. 1 is the external structure of the present invention；
Fig. 2 is the module connection figure of the present invention；
Fig. 3 is the flow chart of the present invention.
In figure：1 shell, 11 display screens, 12 control buttons, 2 circuit boards, 21 three-phase current connecting terminals, 22 three-phase voltages
Connecting terminal, 23 relay handover modules, 231 current switching units, 232 voltage switch units, 24 constant-current source circuits, 25 centers
Processor, 26AD analog-to-digital conversions device, 27 human-computer interaction modules, 271 liquid crystal displays, 272 keyboard units, the storage of 273 data
Unit, 28 defencive function modules, 281 signal acquisition modules, 282 breaking protection modules, 283 power failure protection modules.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
- 3 are please referred to Fig.1, a kind of hand-held three-phase transformer instrument for measuring DC resistance includes the shell with hollow structure
1, circuit board 2 has been bolted on the inner wall of shell 1, and display screen 11 and control button 12 are installed on the front of shell 1,
Three-phase current connecting terminal 21, three-phase voltage connecting terminal 22, relay handover module 23, constant current are respectively equipped on circuit board 2
Source circuit 24, central processing unit 25, AD analog-digital converters 26, human-computer interaction module 27 and defencive function module 28；
Circuit board 2 is electrically connected by control line and display screen 11 and control button 12；
Relay handover module 23 includes current switching unit 231 and voltage switch unit 232, current switching unit 231
Connect respectively with three-phase current connecting terminal 21 and three-phase voltage connecting terminal 22 with the input terminal of voltage switch unit 232 defeated
Outlet connects, three-phase current connecting terminal 21 and three-phase voltage connecting terminal 22 respectively with the current signal of three-phase transformer and electricity
The output end of pressure signal connects；
Human-computer interaction module 27 includes liquid crystal display 271, keyboard unit 272 and data storage cell 273, liquid crystal
The input terminal of display unit 271 connects with the input terminal of central processing unit 25；
Liquid crystal display 271 is also connect with display screen 11, for showing that D.C. resistance test, test data are inquired, in fact
When clock setting and system parameter setting menu；
The output end of keyboard unit 272 connects with the input terminal of central processing unit 25, and keyboard unit 272 is gone back and control button
12 connections, are used for all operations of controller unit；
Data storage cell 273 is connected with central processing unit 25, for storing test data to the machine or in flash disk, together
When also can out of the machine or flash disk read test data information；
Defencive function module 28 includes signal acquisition module 281, breaking protection module 282 and power failure protection module 283,
The input terminal of signal acquisition module 281 connects with current switching unit 231 and voltage switch unit 232, signal acquisition module
281, the output end of breaking protection module 282 and power failure protection module 283 connects with AD analog-digital converters 26, breaking protection mould
282 breaking protection function of block i.e. during the test, encounters test loop and occurs breakpoint suddenly, such as testing clamp poor contact is broken
It opens, to generate very high inverse electromotive force, should have discharge loop that instrument is protected not to be damaged, power failure protection module 283 is
In open state or test process, meets emergency situations by chance and system power supply is caused to fail, the self-protection function of instrument；
Signal acquisition module 281, which acquires the signal that current switching unit 231 and voltage switch unit 232 obtain and filters, divides
Separate out effective signal；
AD analog-digital converters 26 are sent to central processing unit 25, central processing for converting analog signals into digital signal
Device 25 arranges test result calculations, is output to human-computer interaction module 27；
The output end of central processing unit 25 connects with constant-current source circuit 24, the output end and current switching of constant-current source circuit 24
Unit 231 connects；
Constant-current source circuit 24 passes through the current switching channel of relay handover module 23 for testing required test electric current
Current transmission will be tested to three-phase current connecting terminal 21；
The concrete operations of the present invention include the following steps：
Step 1：After booting, when showing that D.C. resistance test, test data are inquired, are real-time on the display screen 11 of instrument
Four clock setting, system parameter setting menu selections carry out after entering D.C. resistance test menu using the selection of control button 12
Divide single-phase test or three-phase test；
Step 2：In the selection three-phase resistance test of D.C. resistance parameter setting interface, then enter three-phase test program, program
First judge that the winding of test is YN types connection winding or Y/ △ type windings, will then test separate mark if it is YN types winding sets
It is set to AO, after single-phase test subroutine, program is first according to testing separate control relay handover module 23 by current switching unit
231 and voltage switch unit 232 be switched to selected test phase, 24 the output phase of constant-current source circuit is started according to the current value of setting
The test electric current answered, after electric current stabilization, voltage and current value in acquisition circuit calculates the resistance value of test product, waits for that resistance value is steady
After fixed, stop testing and discharging, after the completion of single-phase test subroutine, judge whether BO, CO test completion, if do not tested,
Separate mark will be tested and be set as BO or CO, call single-phase test subroutine again, so cycle is until three-phase test is all complete
At；
Step 3：Separate mark will be then tested if it is Y/ △ types winding and is set as AB, then calls the single-phase sub- journey of test
Sequence after the completion of single-phase test subroutine, judges whether BC, CA test completion, if do not tested, will test separate mark setting
For BC or CA, single-phase test subroutine is called again, and so cycle is until three-phase test is fully completed；
Step 4：Three-phase test result and unbalance factor are finally calculated into so far three-phase test by central processing unit 25
Program executes completion.
DCR of Transformer test function, defencive function and human-computer interaction module 27 are integrated in so small handset
Watch case is equipped with shorter p-wire especially for 35kV or less distribution transformers, tests out three-phase dc resistance and not automatically
Balance, it is working efficiency higher, precision higher, failure rate smaller, more intelligent, make test more convenient.
In summary：Hand-held three-phase transformer instrument for measuring DC resistance provided by the invention, DCR of Transformer are surveyed
Examination function, defencive function and human-computer interaction module 27 are integrated in so small handheld instrument shell, test out three-phase dc automatically
Resistance and imbalance, it is working efficiency higher, precision higher, failure rate smaller, more intelligent, make test more convenient.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (3)
1. a kind of hand-held three-phase transformer instrument for measuring DC resistance, which is characterized in that include the shell with hollow structure
(1), it is characterised in that：It has been bolted circuit board (2) on the inner wall of the shell (1), has been installed on the front of shell (1)
There are display screen (11) and control button (12), three-phase current connecting terminal (21), three-phase electricity are respectively equipped on the circuit board (2)
Crimp line terminals (22), relay handover module (23), constant-current source circuit (24), central processing unit (25), AD analog-digital converters
(26), human-computer interaction module (27) and defencive function module (28)；
The circuit board (2) is electrically connected by control line and display screen (11) and control button (12)；
The relay handover module (23) includes current switching unit (231) and voltage switch unit (232), current switching list
The input terminal of first (231) and voltage switch unit (232) respectively with three-phase current connecting terminal (21) and three-phase voltage terminals
The output end that sub (22) connect connects；
The human-computer interaction module (27) includes liquid crystal display (271), keyboard unit (272) and data storage cell
(273), the input terminal of liquid crystal display (271) connects with the input terminal of central processing unit (25)；
The liquid crystal display (271) also connect with display screen (11), for showing that D.C. resistance test, test data are looked into
It askes, the menu of real-time clock setting and system parameter setting；
The output end of the keyboard unit (272) connects with the input terminal of central processing unit (25), keyboard unit (272) also with control
Button (12) connection processed, is used for all operations of controller unit；
The data storage cell (273) is connected with central processing unit (25), for storing test data to the machine or to flash disk
It is interior, at the same also can out of the machine or flash disk read test data information；
The defencive function module (28) includes signal acquisition module (281), breaking protection module (282) and power-off protection mould
The input terminal of block (283), signal acquisition module (281) connects with current switching unit (231) and voltage switch unit (232),
The output end and AD analog-to-digital conversions of signal acquisition module (281), breaking protection module (282) and power failure protection module (283)
Device (26) connects；
The signal that signal acquisition module (281) the acquisition current switching unit (231) and voltage switch unit (232) obtain is simultaneously
Effective signal is isolated in filtering；
The AD analog-digital converters (26) are sent to central processing unit (25), center for converting analog signals into digital signal
Processor (25) arranges test result calculations, is output to human-computer interaction module (27)；
The output end of the central processing unit (25) connects with constant-current source circuit (24), output end and the electricity of constant-current source circuit (24)
Switch unit (231) is flowed to connect；
The constant-current source circuit (24) passes through the current switching of relay handover module (23) for testing required test electric current
Channel will test current transmission to three-phase current connecting terminal (21).
2. a kind of hand-held three-phase transformer instrument for measuring DC resistance as described in claim 1, it is characterised in that：The three-phase
Current wiring terminal (21) and three-phase voltage connecting terminal (22) respectively with the current signal of three-phase transformer and voltage signal
Output end connects.
3. a kind of hand-held three-phase transformer instrument for measuring DC resistance as described in claim 1, it is characterised in that：The broken string
Protection module (282) breaking protection function during the test, encounters test loop and occurs breakpoint suddenly, such as test cramp joint
Bad disconnection is touched, to generate very high inverse electromotive force, there should be discharge loop that instrument is protected not to be damaged, power-off protection mould
Block (283) meets emergency situations by chance and system power supply is caused to fail i.e. in open state or test process, the self-protection of instrument
Function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810596437.4A CN108535549A (en) | 2018-06-11 | 2018-06-11 | A kind of hand-held three-phase transformer instrument for measuring DC resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810596437.4A CN108535549A (en) | 2018-06-11 | 2018-06-11 | A kind of hand-held three-phase transformer instrument for measuring DC resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108535549A true CN108535549A (en) | 2018-09-14 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810596437.4A Pending CN108535549A (en) | 2018-06-11 | 2018-06-11 | A kind of hand-held three-phase transformer instrument for measuring DC resistance |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490634A (en) * | 2018-09-29 | 2019-03-19 | 国网辽宁省电力有限公司抚顺供电公司 | Intelligent transformer D.C. resistance test device and test method |
| CN110426566A (en) * | 2019-08-27 | 2019-11-08 | 国网浙江长兴县供电有限公司 | A kind of hand-held transformer voltage ratio group tester |
| CN110657998A (en) * | 2019-10-08 | 2020-01-07 | 武汉理工大学 | Resonance crushing vehicle performance tester |
| CN110672922A (en) * | 2019-07-09 | 2020-01-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Special direct-current resistance tester and testing method for three-phase grouped ground wires |
| CN111537810A (en) * | 2020-05-25 | 2020-08-14 | 武汉致卓测控科技有限公司 | Method for testing transformation ratio and group of three-phase transformer and handheld tester |
| CN112327054A (en) * | 2020-10-10 | 2021-02-05 | 杭州松泰电力科技有限公司 | Transformer direct-current resistance tester with high safety |
| CN113092920A (en) * | 2021-04-14 | 2021-07-09 | 山东环科电力科技有限公司 | Handheld secondary defect elimination tester |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109490634A (en) * | 2018-09-29 | 2019-03-19 | 国网辽宁省电力有限公司抚顺供电公司 | Intelligent transformer D.C. resistance test device and test method |
| CN110672922A (en) * | 2019-07-09 | 2020-01-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Special direct-current resistance tester and testing method for three-phase grouped ground wires |
| CN110426566A (en) * | 2019-08-27 | 2019-11-08 | 国网浙江长兴县供电有限公司 | A kind of hand-held transformer voltage ratio group tester |
| CN110657998A (en) * | 2019-10-08 | 2020-01-07 | 武汉理工大学 | Resonance crushing vehicle performance tester |
| CN111537810A (en) * | 2020-05-25 | 2020-08-14 | 武汉致卓测控科技有限公司 | Method for testing transformation ratio and group of three-phase transformer and handheld tester |
| CN112327054A (en) * | 2020-10-10 | 2021-02-05 | 杭州松泰电力科技有限公司 | Transformer direct-current resistance tester with high safety |
| CN113092920A (en) * | 2021-04-14 | 2021-07-09 | 山东环科电力科技有限公司 | Handheld secondary defect elimination tester |
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