CN106405244A - Novel digital megger with automatic phase-shift measurement - Google Patents
Novel digital megger with automatic phase-shift measurement Download PDFInfo
- Publication number
- CN106405244A CN106405244A CN201610996241.5A CN201610996241A CN106405244A CN 106405244 A CN106405244 A CN 106405244A CN 201610996241 A CN201610996241 A CN 201610996241A CN 106405244 A CN106405244 A CN 106405244A
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- China
- Prior art keywords
- voltage
- relay
- single chip
- push
- module
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Links
- 238000005259 measurement Methods 0.000 title claims abstract description 14
- 230000010363 phase shift Effects 0.000 title abstract 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 abstract description 5
- 230000009466 transformation Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a novel digital megger with automatic phase-shift measurement. The novel digital megger comprises a PIC single chip microcomputer, a multi-channel high voltage switch module, a voltage-doubler and rectifier circuit, a push-pull circuit, a lithium battery group, a DC/DC auxiliary circuit module, a touch screen, and a PIC single chip microcomputer in a sequentially closed connection, wherein the push-pull circuit is driven by a PWM control chip, the lithium battery group is formed by the parallel connection of multiple lithium batteries, the multi-channel high voltage switch module has three switching channels and A, B, C, N and G wire connection terminals, the DC/DC auxiliary circuit module is formed by two Boost converters, the DC/DC auxiliary circuit module provides power supply voltage to the PIC single chip microcomputers, the touch screens and chips. According to the novel digital megger, the automatic phase-shift measurement of the insulation resistance of electrical equipment, a household appliance or an electric circuit to the ground and between phases can be precisely realized, and the novel digital megger has the advantages of a small volume, higher efficiency, good stability and higher cost performance.
Description
Technical field
The invention belongs to electric instrument structure technology, especially relate to a kind of megameter structure skill of automatic commutation measurement numeral
Art.
Background technology
In grid power transmission, power transformation, distribution maintenance repair are safeguarded, there is the work of a large amount of power circuits insulation remote measurements in megameter
Make.But the precision of existing automatic commutation measurement numeral megaohm, volume, efficiency, stability are needed to improve, therefore here invention one
Plant new type auto commutation and measure numerical megger.
Content of the invention
For the deficiency that now commutation measurement numeral megaohm exists automatically, the invention provides a kind of new type auto commutation measurement
Numerical megger.
The technical scheme is that：A kind of new type auto commutation measures numerical megger, the invention is characterised in that：By
PIC single chip microcomputer, multichannel high voltage switching module, voltage doubling rectifing circuit, push-pull circuit, lithium battery group, DC/DC auxiliary circuit mould
Block, touch screen, PIC single chip microcomputer sequentially close connection；Wherein, push-pull circuit is driven by pwm chip, and lithium battery group is by many
Section lithium battery is formed in parallel, and has three switching channels and five terminals of A, B, C, N, G, DC/ in multichannel high voltage switching module
DC auxiliary circuit module is made up of two Boost boost converters, DC/DC auxiliary circuit module be PIC single chip microcomputer, touch screen and
Each chip etc. provides supply voltage.
Multichannel high voltage switching module of the present invention is made up of K1 K6 high-voltage relay, passes through K7 K9 relay simultaneously
The control of device carries out the shielding of leakage current, and K10 Control push-pull circuit works, and each relay passes through relay driving core
Piece works.
Voltage amplifier chip of the present invention is programmable amplifier chip, so as to automatically control it by PIC single chip microcomputer
Amplification.
DC/DC auxiliary circuit module of the present invention is made up of DC/DCBoost I and DC/DCBoost II, by lithium battery group
Voltage transformation becomes 5V, 12V voltage.
The invention has the beneficial effects as follows：The realization automatic commutation measurement electrical equipment of energy precision, household electrical appliance or electric wire
Road over the ground and alternate insulation resistance, volume is less, in hgher efficiency simultaneously, stability more preferably, cost performance is more high.
Brief description
Fig. 1 is the structured flowchart of the present invention；
Fig. 2 is the circuit theory diagrams of the present invention.
Specific embodiment
Embodiment 1：As shown in Figure 1-2,1, a kind of new type auto commutation measurement numerical megger it is characterised in that：By PIC
Single-chip microcomputer, multichannel high voltage switching module, voltage doubling rectifing circuit, push-pull circuit, lithium battery group, DC/DC auxiliary circuit module, touch
Control screen, PIC single chip microcomputer sequentially close connection；Wherein, push-pull circuit is driven by pwm chip, and lithium battery group is by more piece lithium
Cell parallel forms, and has three switching channels and five terminals of A, B, C, N, G in multichannel high voltage switching module, and DC/DC is auxiliary
Circuit module is helped to be made up of two Boost boost converters, DC/DC auxiliary circuit module is PIC single chip microcomputer, touch screen and each core
Piece provides supply voltage.
Multichannel high voltage switching module of the present invention is made up of K1 K6 high-voltage relay, passes through K7 K9 relay simultaneously
The control of device carries out the shielding of leakage current, and K10 Control push-pull circuit works, and each relay passes through relay driving core
Piece works.
Voltage amplifier chip of the present invention is programmable amplifier chip, so as to automatically control it by PIC single chip microcomputer
Amplification.
DC/DC auxiliary circuit module of the present invention is made up of DC/DCBoost I and DC/DCBoost II, by lithium battery group
Voltage transformation becomes 5V, 12V voltage.
The work process of the present invention is：
Using pwm chip produce certain frequency PWM1 and PWM1, respectively by PWM1, PWM2 close metal-oxide-semiconductor Q1,
Q2 forms push-pull type Switching Power Supply, and the direct current of push-pull type Switching Power Supply output produces high direct voltage through voltage doubling rectifing circuit, and it is defeated
Going out value is 1000V or 2500V.When high-voltage dc voltage flows through multichannel high voltage switching module, it passes through tri- wiring of A, B, C
The lug at end is pressurized to the A phase line of electric wire, B phase line, C phase line, and N terminals are grounded, and G terminals use as needed.Then
PIC single chip microcomputer itself A/D converter collection voltages between R6, R7 realize voltage stabilizing control, and voltage amplifier chip is passed through to gather R8
Voltage calculate leakage current, insulation resistance and absorptance, numerical value will be sequentially displayed on touch screen the most at last.
If megameter will measure A phase line insulating resistance value, when high-voltage dc voltage flows through multichannel high voltage switching module
When be automatically switched off K1 relay and K8, K9 relay, other relays are off (as Fig. 2)；If megameter will be surveyed
Amount B phase line insulating resistance value, be automatically switched off when high-voltage dc voltage flows through multichannel high voltage switching module K3 relay and K7,
K9 relay, other relays are off；If megameter will measure C phase line insulating resistance value, work as high voltage direct current
Pressure is automatically switched off K5 relay and K7, K8 relay when flowing through multichannel high voltage switching module, and other relays are in disconnection shape
State；If megameter will measure A-B phase insulation resistance value, when high-voltage dc voltage flows through multichannel high voltage switching module certainly
Dynamic closing K1 relay, K4 relay and K9 relay, other relays are off；If megameter will measure A-C
Phase line insulating resistance value, is automatically switched off K1 relay, K6 relay when high-voltage dc voltage flows through multichannel high voltage switching module
Device and K8 relay, other relays are off；If megameter will measure B-C phase line insulating resistance value, work as high pressure
DC voltage is automatically switched off K3 relay, K6 relay and K7 relay, other relays when flowing through multichannel high voltage switching module
Device is off.Wherein before automatic commutation, K10 relay can control pwm chip deactivation, push-pull circuit will stop every time
With after automatic commutation, K10 controls pwm chip startup, push-pull circuit by work, just starts to measure.
Above in conjunction with accompanying drawing, the specific embodiment of the present invention is explained in detail, but the present invention be not limited to above-mentioned
Embodiment, in the ken that those of ordinary skill in the art possess, can also be before without departing from present inventive concept
Put that various changes can be made.
Claims (4)
1. a kind of new type auto commutation measurement numerical megger it is characterised in that：By PIC single chip microcomputer, multichannel high-voltage switch gear mould
Block, voltage doubling rectifing circuit, push-pull circuit, lithium battery group, DC/DC auxiliary circuit module, touch screen, PIC single chip microcomputer are sequentially closed
Connect；Wherein, push-pull circuit is driven by pwm chip, and lithium battery group is formed in parallel by multisection lithium battery, multichannel high pressure
Three switching channels and five terminals of A, B, C, N, G are had, DC/DC auxiliary circuit module is by two Boost liters in switch module
Pressure converter forms, and DC/DC auxiliary circuit module is PIC single chip microcomputer, touch screen and each chip provide supply voltage.
2. a kind of new type auto commutation measurement numerical megger according to claim 1 it is characterised in that：Described multichannel
High voltage switching module is made up of K1 K6 high-voltage relay, carries out the screen of leakage current by the control of K7 K9 relay simultaneously
Cover, K10 Control push-pull circuit works, each relay passes through relay driving chip operation.
3. a kind of new type auto commutation measurement numerical megger according to claim 1 it is characterised in that：Described DC/DC
Auxiliary circuit module is made up of DC/DCBoost I and DC/DCBoost II.
4. a kind of new type auto commutation measurement numerical megger according to claim 1 it is characterised in that：Described voltage fortune
Putting chip is programmable amplifier chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610996241.5A CN106405244A (en) | 2016-11-11 | 2016-11-11 | Novel digital megger with automatic phase-shift measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610996241.5A CN106405244A (en) | 2016-11-11 | 2016-11-11 | Novel digital megger with automatic phase-shift measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106405244A true CN106405244A (en) | 2017-02-15 |
Family
ID=59230326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610996241.5A Pending CN106405244A (en) | 2016-11-11 | 2016-11-11 | Novel digital megger with automatic phase-shift measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106405244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534824A (en) * | 2019-07-22 | 2019-12-03 | 大城绿川（深圳）科技有限公司 | A kind of lead-acid accumulator on-line intelligence maintenance system of the RS485 communication based on adaptive networking |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201173953Y (en) * | 2007-12-21 | 2008-12-31 | 珠海伊万电子科技有限公司 | Portable double-display automatic range digital megameter |
| CN101378233A (en) * | 2007-08-31 | 2009-03-04 | 叶燕霞 | Power supply architecture capable of dynamic regulation in a wide region |
| CN102130598A (en) * | 2011-03-21 | 2011-07-20 | 天津市东文高压电源厂 | Pulse width modulation push-pull type positive output electrostatic spinning high-voltage complete machine power supply |
| CN203616394U (en) * | 2013-12-20 | 2014-05-28 | 银川银和伟业电力设备有限公司 | An intelligent insulation resistance tester |
| CN205581209U (en) * | 2016-04-29 | 2016-09-14 | 云南电网有限责任公司西双版纳供电局 | Automatic digital megohmmeter is measured in commutation |
| CN206339597U (en) * | 2016-11-11 | 2017-07-18 | 云南电网有限责任公司西双版纳供电局 | A kind of new type auto commutation measurement numerical megger |
-
2016
- 2016-11-11 CN CN201610996241.5A patent/CN106405244A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101378233A (en) * | 2007-08-31 | 2009-03-04 | 叶燕霞 | Power supply architecture capable of dynamic regulation in a wide region |
| CN201173953Y (en) * | 2007-12-21 | 2008-12-31 | 珠海伊万电子科技有限公司 | Portable double-display automatic range digital megameter |
| CN102130598A (en) * | 2011-03-21 | 2011-07-20 | 天津市东文高压电源厂 | Pulse width modulation push-pull type positive output electrostatic spinning high-voltage complete machine power supply |
| CN203616394U (en) * | 2013-12-20 | 2014-05-28 | 银川银和伟业电力设备有限公司 | An intelligent insulation resistance tester |
| CN205581209U (en) * | 2016-04-29 | 2016-09-14 | 云南电网有限责任公司西双版纳供电局 | Automatic digital megohmmeter is measured in commutation |
| CN206339597U (en) * | 2016-11-11 | 2017-07-18 | 云南电网有限责任公司西双版纳供电局 | A kind of new type auto commutation measurement numerical megger |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110534824A (en) * | 2019-07-22 | 2019-12-03 | 大城绿川（深圳）科技有限公司 | A kind of lead-acid accumulator on-line intelligence maintenance system of the RS485 communication based on adaptive networking |
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Application publication date: 20170215 |
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