CN206339597U - A kind of new type auto commutation measurement numerical megger - Google Patents
A kind of new type auto commutation measurement numerical megger Download PDFInfo
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- CN206339597U CN206339597U CN201621260018.6U CN201621260018U CN206339597U CN 206339597 U CN206339597 U CN 206339597U CN 201621260018 U CN201621260018 U CN 201621260018U CN 206339597 U CN206339597 U CN 206339597U
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Abstract
A kind of new type auto commutation measurement numerical megger, connection is sequentially closed by PIC single chip microcomputer, multichannel high voltage switching module, voltage doubling rectifing circuit, push-pull circuit, lithium battery group, DC/DC auxiliary circuits module, touch screen, PIC single chip microcomputer；Wherein, push-pull circuit is driven by pwm chip, lithium battery group is formed in parallel by multisection lithium battery, there are five terminals of three switching channels and A, B, C, N, G in multichannel high voltage switching module, DC/DC auxiliary circuits module is made up of two Boost boost converters, and DC/DC auxiliary circuits module is that PIC single chip microcomputer, touch screen and each chip etc. provide supply voltage.The utility model energy precision realizes automatic commutation measurement electrical equipment, household electrical appliance or electric wiring over the ground and alternate insulaion resistance, at the same volume is smaller, more efficient, stability more preferably, cost performance is more high.
Description
Technical field
The utility model belongs to electric instrument structure technology, and the megameter knot of numeral is measured more particularly, to a kind of automatic commutation
Structure technology.
Background technology
There is the work of a large amount of power circuits insulation remote measurements in grid power transmission, power transformation, distribution maintenance repair are safeguarded in megameter
Make.But the precision for existing automatic commutation measurement numeral megaohm, volume, efficiency, stability need to improve, therefore invent one herein
Plant new type auto commutation measurement numerical megger.
The content of the invention
For the deficiency that now automatic commutation measurement numeral megaohm is present, the utility model provides a kind of new type auto commutation
Measure numerical megger.
The technical solution of the utility model is：A kind of new type auto commutation measurement numerical megger, the utility model feature
It is：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 screen, PIC single chip microcomputer sequentially close connection；Wherein, push-pull circuit is driven by pwm chip, lithium battery
Group is formed in parallel by multisection lithium battery, there is five wiring of three switching channels and A, B, C, N, G in multichannel high voltage switching module
End, DC/DC auxiliary circuits module is made up of two Boost boost converters, and DC/DC auxiliary circuits module is PIC single chip microcomputer, touched
Control screen and each chip etc. provide supply voltage.
Multichannel high voltage switching module described in the utility model is made up of K1-K6 high-voltage relays, while passing through K7-K9
The control of relay carries out the shielding of leakage current, and K10 Controls push-pull circuit is worked, and each relay is driven by relay
Dynamic chip operation.
The utility model voltage amplifier chip is programmable amplifier chip, so as to automatically control it by PIC single chip microcomputer
Multiplication factor.
DC/DC auxiliary circuits module described in the utility model is made up of DC/DCBoost I and DC/DCBoost II, by lithium electricity
Pond group voltage transformation is into 5V, 12V voltage.
The beneficial effects of the utility model are：The automatic commutation measurement electrical equipment of realization, household electrical appliance or the electricity of energy precision
Gas line-to-ground and alternate insulaion resistance, while volume is smaller, more efficient, stability more preferable, cost performance is more high.
Brief description of the drawings
Fig. 1 is structured flowchart of the present utility model；
Fig. 2 is circuit theory diagrams of the present utility model.
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 circuits 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 is formed, and has five terminals of three switching channels and 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 circuits module is PIC single chip microcomputer, touch screen and each core
Piece provides supply voltage.
Multichannel high voltage switching module described in the utility model is made up of K1-K6 high-voltage relays, while passing through K7-K9
The control of relay carries out the shielding of leakage current, and K10 Controls push-pull circuit is worked, and each relay is driven by relay
Dynamic chip operation.
The utility model voltage amplifier chip is programmable amplifier chip, so as to automatically control it by PIC single chip microcomputer
Multiplication factor.
DC/DC auxiliary circuits module described in the utility model is made up of DC/DCBoost I and DC/DCBoost II, by lithium electricity
Pond group voltage transformation is into 5V, 12V voltage.
The course of work of the present utility model is：
Using pwm chip produce certain frequency PWM1 and PWM1, respectively by PWM1, PWM2 close metal-oxide-semiconductor Q1,
Q2 formation push-pull type Switching Power Supplies, the direct current of push-pull type Switching Power Supply output produces high direct voltage through voltage doubling rectifing circuit, and its is defeated
Go out value for 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 connector lug at end is pressurized to the A phase lines, B phase lines, C phase lines of electric wire, and N terminals ground connection, G terminals are used as needed.Then
PIC single chip microcomputer itself A/D converter realizes voltage stabilizing control from collection voltages between R6, R7, and voltage amplifier chip is by gathering R8
Voltage calculate leakage current, insulaion resistance and absorptance, most numerical value will be sequentially displayed on touch screen at last.
If megameter will measure A phase line insulating resistance values, when high-voltage dc voltage flows through multichannel high voltage switching module
Shi Zidong closes K1 relays and K8, K9 relay, and other relays are off (such as Fig. 2)；If megameter will be surveyed
Measure B phase line insulating resistance values, when high-voltage dc voltage flows through multichannel high voltage switching module it is automatic close K3 relays and K7,
K9 relays, other relays are off；If megameter will measure C phase line insulating resistance values, work as high voltage direct current
Pressure is automatic when flowing through multichannel high voltage switching module to close K5 relays and K7, K8 relay, and other relays, which are in, disconnects shape
State；If megameter will measure A-B phase insulation resistance values, when high-voltage dc voltage flows through multichannel high voltage switching module certainly
Dynamic to close K1 relays, K4 relays and K9 relays, other relays are off；If megameter will measure A-C
Phase line insulating resistance value, it is automatic when high-voltage dc voltage flows through multichannel high voltage switching module to close K1 relays, K6 relays
Device and K8 relays, other relays are off；If megameter will measure B-C phase line insulating resistance values, work as high pressure
DC voltage is automatic when flowing through multichannel high voltage switching module to close K3 relays, K6 relays and K7 relays, other relays
Device is off.Wherein K10 relays can control that pwm chip is disabled, push-pull circuit will stop before automatic commutation every time
With, after after automatic commutation K10 control pwm chip start, push-pull circuit by work, just start measurement.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not
It is limited to above-mentioned embodiment, in the knowledge that those of ordinary skill in the art possess, this practicality can also be not being departed from
Various changes can be made on the premise of new objective.
Claims (3)
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 circuits module, touch screen, PIC single chip microcomputer are sequentially closed
Connection；Wherein, push-pull circuit is driven by pwm chip, and lithium battery group is formed in parallel by multisection lithium battery, multichannel high pressure
There are five terminals of three switching channels and A, B, C, N, G in switch module, DC/DC auxiliary circuits module is by two Boost liters
Pressure converter is constituted, and DC/DC auxiliary circuits 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：The multichannel
High voltage switching module is made up of K1-K6 high-voltage relays, while carrying out the screen of leakage current by the control of K7-K9 relays
Cover, K10 Controls push-pull circuit work, 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：The DC/DC
Auxiliary circuit module is made up of DC/DCBoost I and DC/DCBoost II.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621260018.6U CN206339597U (en) | 2016-11-11 | 2016-11-11 | A kind of new type auto commutation measurement numerical megger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621260018.6U CN206339597U (en) | 2016-11-11 | 2016-11-11 | A kind of new type auto commutation measurement numerical megger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206339597U true CN206339597U (en) | 2017-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621260018.6U Active CN206339597U (en) | 2016-11-11 | 2016-11-11 | A kind of new type auto commutation measurement numerical megger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405244A (en) * | 2016-11-11 | 2017-02-15 | 云南电网有限责任公司西双版纳供电局 | Novel digital megger with automatic phase-shift measurement |
-
2016
- 2016-11-11 CN CN201621260018.6U patent/CN206339597U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106405244A (en) * | 2016-11-11 | 2017-02-15 | 云南电网有限责任公司西双版纳供电局 | Novel digital megger with automatic phase-shift measurement |
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