CN208506234U - A kind of generic polar test circuit - Google Patents
A kind of generic polar test circuit Download PDFInfo
- Publication number
- CN208506234U CN208506234U CN201820506548.7U CN201820506548U CN208506234U CN 208506234 U CN208506234 U CN 208506234U CN 201820506548 U CN201820506548 U CN 201820506548U CN 208506234 U CN208506234 U CN 208506234U
- Authority
- CN
- China
- Prior art keywords
- resistance
- optocoupler
- foot
- capacitor
- luminous tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 239000003990 capacitor Substances 0.000 claims abstract description 85
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 230000000670 limiting effect Effects 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 16
- 229920004933 Terylene® Polymers 0.000 claims description 9
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 7
- 238000005868 electrolysis reaction Methods 0.000 claims description 6
- 230000004069 differentiation Effects 0.000 claims description 3
- 102200065442 rs193929333 Human genes 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000009466 transformation Effects 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000003760 hair shine Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008717 functional decline Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
A kind of generic polar tests circuit, is related to electrical test field, solve the problems, such as existing for existing current transformer polarity method possibly can not Accurate Determining, it is at high cost, inconvenient for use, need alternating current 220V power supply to support.A kind of generic polar test circuit of the utility model includes battery, integrated circuit, four optocouplers, two luminous tubes, three diodes, 11 resistance, five capacitors, switch, connecting terminals.In test, input signal passes through diode double limiting and capacitor filtering, completes polarity judgement using twin voltage comparator, and the self-sustaining and mutually locking of two polarity instruction luminous tubes are completed using optocoupler.The utility model route is simple, clear principle, easily operated, reliable operation, small in size, at low cost.Circuit sensitivity is high, versatile, and power supply can measure all transformation ratio current transformer polarity in the current and following power grid using 9V laminated cell, can also measure the polarity of all electromagnetic potential transformers and transformer in power grid.
Description
Technical field
The utility model relates to electrical test technical fields, and in particular to a kind of generic polar test circuit.
Background technique
Current transformer incorrect polarity will cause protective relaying maloperation, tripping accident, also will cause measurement, metering misalignment.
According to the rules, polarity test should be carried out to it before current transformer access first and second circuit of electric system.
Dry cell and pointer gauge are generallyd use at present to measure current transformer polarity, and this method is mainly in Current Mutual Inductance
The current gear or voltage gear that pointer multimeter is accessed between device secondary terminals S1, S2, by terminals P 1 of current transformer, P2 wink
Between be shorted dry cell circuit, polarity is judged according to multimeter throw of pointer situation.Followed by use current transformer integration test
Instrument measures current transformer polarity.
Tested using battery pointer gauge measuring current transformer polarity the problem is that: multimeter throw of pointer amplitude
The small time is short, measures difficult when encountering current mutual inductor with high transforming ratio or even can not measure.In addition there are one special for this method
It is required that exactly having to use pointer multimeter, digimer cannot be used, because digital multimeter can not judge transient electrical
Pulse direction.And current transformer polarity is measured using comprehensive tester of current transformer the problem is that: expensive equipment,
A large amount of work units are difficult to be equipped with；Instrument is heavy, transports inconvenient for use；Instrument using when need alternating current 220V power supply support.
Utility model content
In order to solve existing for existing current transformer polarity method possibly can not Accurate Determining, it is at high cost, inconvenient for use,
The problem of needing alternating current 220V power supply to support, the utility model provide a kind of generic polar test circuit.
Used technical solution is as follows in order to solve the technical problem for the utility model:
A kind of generic polar of the utility model tests circuit, comprising: battery, integrated circuit, the first optocoupler, the second light
Coupling, third optocoupler, the 4th optocoupler, the first luminous tube, the second luminous tube, first diode, the second diode, third diode,
First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th
Resistance, eleventh resistor, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, is switched, is connect the tenth resistance
Line terminals；
The end P2 of the connecting terminal, second resistance one end, integrated circuit foot 4., third optocoupler foot 3., the 4th optocoupler foot
3., the second capacitor cathode, third diode cathode, battery cathode, first capacitor cathode connection；
The anode, the normal opened contact in first group of two-way contact of switch, the connection of the 9th resistance one end；
Common junction, the second capacitance cathode, the 4th capacitor one end, the 8th resistance in first group of two-way contact of the switch
One end, the second luminous tube anode, the second optocoupler foot 4., the first optocoupler foot 4., the first luminous tube anode, the 7th resistance one end, the
Three capacitor one end, integrated circuit foot 8., first resistor one end connection；
The 9th resistance other end is connect with the normally closed contact in second group of two-way contact of switch；
The first capacitor anode is connect with the common junction in second group of two-way contact of switch；
Normal opened contact, third diode cathode, the connection of the tenth resistance one end in second group of two-way contact of the switch；
The connection of the end P1 of the tenth resistance other end and connecting terminal；
The end S1 of the connecting terminal, first diode anode, the second diode cathode, the 5th capacitor one end, the 11st
Resistance one end, integrated circuit foot are 2., 5. integrated circuit foot connects；
The end S2 of the connecting terminal, first diode cathode, the second diode cathode, the 5th capacitor other end, the tenth
The one resistance other end, 3rd resistor one end, the connection of the 4th resistance one end；
3. the first resistor other end, the 3rd resistor other end are connect with integrated circuit foot；
6. the second resistance other end, the 4th resistance other end are connect with integrated circuit foot；
1. the first luminous tube cathode is connect with the first optocoupler foot；
2. 1. the first optocoupler foot is connect with third optocoupler foot；
The third optocoupler foot 2., the third capacitor other end, the 7th resistance other end, the 5th resistance one end, the second optocoupler
3. foot connects；
The integrated circuit foot is 1., 4. the 5th resistance other end, third optocoupler foot connect；
1. the second luminous tube cathode is connect with the second optocoupler foot；
2. 1. the second optocoupler foot is connect with the 4th optocoupler foot；
The 4th optocoupler foot 2., the 4th capacitor other end, the 8th resistance other end, the 6th resistance one end, the first optocoupler
3. foot connects；
The integrated circuit foot is 7., 4. the 6th resistance other end, the 4th optocoupler foot connect.
Further, test starts, and switch is pressed by position 0 to position 1, obtained using integrated circuit as the circuit of core it is electric,
At this point, the voltage between the end S1 and the end S2 of connecting terminal is zero, two in integrated circuit voltage comparator non-inverting input terminal
Current potential is all higher than reverse input end current potential, and two voltage comparators all export high potential, and the first luminous tube, the second luminous tube are all located
In OFF state；
Switch is pressed by position 1 to position 2, first capacitor puts the first optocoupler and the second optocoupler circuit by the tenth resistance
Electricity；The end S1 of connecting terminal, the induced voltage at the end S2 add after first diode and the second diode limiting, the 5th capacitor filtering
The input terminal of two voltage comparators in integrated circuit；If the S1 terminal potential of connecting terminal is higher than first resistor and third at this time
Ohmic connection points current potential, then 1. integrated circuit foot exports low potential, and the first luminous tube lights sending green light, while third optocoupler pair
First luminous tube self-sustaining, the first optocoupler are latched the second luminous tube, illustrate that current transformer polarity mark to be measured is correct；If this
When connecting terminal S1 terminal potential be lower than the 4th resistance and second resistance tie point current potential, then 7. integrated circuit foot exports low electricity
Position, the second luminous tube lights sending feux rouges, while the 4th optocoupler, to the second luminous tube self-sustaining, the second optocoupler is to the first luminous tube
Locking illustrates that current transformer polarity mark to be measured is wrong.
Further, test terminates, and switch Self-resetting is to position 0, the first luminous tube, the second luminous tube self-sustaining and mutually
Lock release, battery charges to first capacitor by the normally closed contact in second group of the 9th resistance, switch two-way contact SW-1, quasi-
Standby test next time.
Further, the integrated circuit uses LM393P；First luminous tube, Φ 3, green；Described second shines
Pipe, Φ 3 are red；The first capacitor is 1mF35V, electrolysis；Second capacitor is 1 μ F35V, electrolysis；The third capacitor
For 1nF10V, terylene；4th capacitor is 1nF10V, terylene；5th capacitor is 100nF10V, terylene；Described first
Resistance and second resistance are 10k Ω/0.25W；The 3rd resistor, the 4th resistance are 100 Ω/0.25W；5th electricity
Resistance and the 6th resistance are 2k Ω/1W；7th resistance, the 8th resistance are 100k Ω/0.25W；9th resistance is
200Ω/1W；Tenth resistance is 2 Ω/2W；The eleventh resistor is 68k Ω/0.25W；- the four light of first optocoupler
Coupling is all made of P521；The first diode, the second diode and third diode are all made of 1N4007；The connecting terminal is
2A/50V；The battery uses 9V laminated cell.
Further, the first resistor, second resistance, 3rd resistor, the 4th resistance are for setting two in integrated circuit
The bias voltage of a voltage comparator；The 3rd resistor, the 4th resistance are for setting two voltage comparators in integrated circuit
Differentiation voltage.
Further, the switch uses 2A/50V, two groups of two-way contacts, Self-resetting three position switch；When position 0, two
Common junction and respective normally closed contact in group two-way contact are connected；Common junction when position 1, in the 1st group of two-way contact
The 2nd group of two-way contact state simultaneously is connected with its normal opened contact to remain unchanged；When position 2, public in two groups of two-way contacts is connect
Point is all connected with respective normal opened contact.
Further, first luminous tube, the second luminous tube branch using the first optocoupler, the second optocoupler, third optocoupler,
4th optocoupler completes self-sustaining and mutually locking.
Further, the integrated circuit uses twin voltage comparator, and operating temperature lower limit is -25 DEG C, operating voltage model
It encloses for 2~36V.
Further, by third diode protection first capacitor, its reverse charging voltage is limited in 0.7V hereinafter, protecting
Card occurs without reversely charging electrical phenomena.
Further, when test, the low-voltage side coil of the end P1 of connecting terminal, the end P2 and current transformer to be measured is connected
It connects, the end S1 of connecting terminal, the end S2 is connect with the high pressure lateral coil of current transformer to be measured.
The beneficial effects of the utility model are: the utility model, in test, input signal passes through diode double limiting
And capacitor filtering, polarity judgement is completed using twin voltage comparator, the self-insurance of two polarity instruction luminous tubes is completed using optocoupler
It holds and is mutually latched.Compared with existing, have the advantage that
One, the circuit sensitivity high universalizable of the utility model is strong, and power supply can be measured currently using 9V laminated cell
And all transformation ratio current transformer polarity in the following power grid, can also measure in power grid all electromagnetic potential transformers and
The polarity of transformer.
Two, the utility model route is simple, clear principle, easily operated, reliable operation.
Three, the circuit whole element of the utility model can be fitted into the shell of a cigarette case size, small in size, only
Cigarette case size is highly susceptible to carrying and using.
Four, the utility model uses conventional component, low in cost, easy to spread.
Detailed description of the invention
Fig. 1 is that a kind of generic polar of the utility model tests circuit diagram.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of generic polar of the utility model tests circuit, it mainly include battery BAT, integrated circuit
IC, the first optocoupler P1, the second optocoupler P2, third optocoupler P3, the 4th optocoupler P4, the first luminous tube L1, the second luminous tube L2, first
Diode D1, the second diode D2, third diode D3, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance
R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 11st
Resistance R11, first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, switch SW, terminals
Sub- CN.
The end P2 of connecting terminal CN, the one end second resistance R2, Integrated circuit IC foot 4., third optocoupler P3 foot 3., the 4th light
Coupling P4 foot 3., the second capacitor C2 cathode, third diode D3 anode, battery BAT cathode, first capacitor C1 cathode connection.
Battery BAT anode, the normal opened contact in first group of two-way contact SW-1 of switch SW, the connection of the 9th one end resistance R9.
Common junction, the second capacitor C2 anode, the 4th one end capacitor C4 in first group of two-way contact SW-1 of switch SW,
Eight one end resistance R8, the second luminous tube L2 anode, the second optocoupler P2 foot 4., the first optocoupler P1 foot 4., the first luminous tube L1 anode,
7th one end resistance R7, the one end third capacitor C3, Integrated circuit IC foot 8., the one end first resistor R1 connection.
The 9th resistance R9 other end is connect with the normally closed contact in second group of two-way contact SW-2 of switch SW.
First capacitor C1 anode is connect with the common junction in second group of two-way contact SW-2 of switch SW.
Normal opened contact, third diode D3 cathode, the tenth one end resistance R10 in second group of two-way contact SW-2 of switch SW
Connection.
The tenth resistance R10 other end is connect with the end P1 of connecting terminal CN.
The end S1, first diode D1 anode, the second diode D2 cathode, the 5th one end capacitor C5, of connecting terminal CN
11 one end resistance R11, Integrated circuit IC foot are 2., 5. Integrated circuit IC foot connects.That is the end S1 of connecting terminal CN, the one or two pole
Pipe D1 anode, the second diode D2 cathode, the 5th one end capacitor C5, the one end eleventh resistor R11 with Integrated circuit IC foot 2.
Connection, meanwhile, the end S1 of connecting terminal CN, first diode D1 anode, the second diode D2 cathode, the 5th one end capacitor C5,
5. the one end eleventh resistor R11 is connect with Integrated circuit IC foot.
The end S2 of connecting terminal CN, first diode D1 cathode, the second diode D2 anode, the 5th capacitor C5 other end,
The eleventh resistor R11 other end, the one end 3rd resistor R3, the connection of the 4th one end resistance R4.
3. the first resistor R1 other end, the 3rd resistor R3 other end are connect with Integrated circuit IC foot.
6. the second resistance R2 other end, the 4th resistance R4 other end are connect with Integrated circuit IC foot.
1. first luminous tube L1 cathode is connect with the first optocoupler P1 foot.
2. 1. first optocoupler P1 foot is connect with third optocoupler P3 foot.
Third optocoupler P3 foot 2., the third capacitor C3 other end, the 7th resistance R7 other end, the 5th one end resistance R5, second
3. optocoupler P2 foot connects.
Integrated circuit IC foot is 1., 4. the 5th resistance R5 other end, third optocoupler P3 foot connect.
1. second luminous tube L2 cathode is connect with the second optocoupler P2 foot.
2. 1. second optocoupler P2 foot is connect with the 4th optocoupler P4 foot.
4th optocoupler P4 foot 2., the 4th capacitor C4 other end, the 8th resistance R8 other end, the 6th one end resistance R6, first
3. optocoupler P1 foot connects.
Integrated circuit IC foot is 7., 4. the 6th resistance R6 other end, the 4th optocoupler P4 foot connect.
A kind of generic polar of the utility model tests circuit, in test, first with conducting wire by the P1 of connecting terminal CN
End, the end P2 are connect with the low-voltage side coil of current transformer to be measured, with conducting wire by the end S1 of connecting terminal CN, the end S2 and electricity to be measured
The high pressure lateral coil of current transformer connects.
Test starts, and switch SW is pressed by position 0 to position 1, obtained using Integrated circuit IC as the circuit of core it is electric, at this point,
Voltage between the end S1 and the end S2 of connecting terminal CN is zero, two in Integrated circuit IC voltage comparator non-inverting input terminal electricity
Position is all higher than reverse input end current potential, and two voltage comparators all export high potential, and the first luminous tube L1, the second luminous tube L2 are
In OFF state.
By switch SW by position 1 quickly by position 2, (first capacitor C1 discharge current is big when test, to reduce switch SW
Contact resistance, it is resolute rapidly when being pressed by position 1 to position 2, be not less than 2 seconds in 2 residence time of position), first capacitor C1 is logical
The tenth resistance R10 is crossed to discharge to the first optocoupler P1 and the second circuit optocoupler P2.The induced voltage at the end S1 of connecting terminal CN, the end S2
Two voltages in Integrated circuit IC are added to after first diode D1 and the second diode D2 clipping, the 5th capacitor C5 filtering to compare
The input terminal of device.If the S1 terminal potential of connecting terminal CN is higher than first resistor R1 and 3rd resistor R3 tie point current potential at this time,
Then 1. Integrated circuit IC foot exports low potential, and the first luminous tube L1 lights sending green light, while third optocoupler P3 shines to first
Pipe L1 self-sustaining, the first optocoupler P1 are latched the second luminous tube L2, this just illustrates that current transformer polarity mark to be measured is correct.Such as
The S1 terminal potential of fruit connecting terminal CN at this time is lower than the 4th resistance R4 and second resistance R2 tie point current potential, then Integrated circuit IC foot
7. exporting low potential, the second luminous tube L2 lights sending feux rouges, while the 4th optocoupler P4 is to the second luminous tube L2 self-sustaining, second
Optocoupler P2 is latched the first luminous tube L1, this just illustrates that current transformer polarity mark to be measured is wrong.
In order to reduce crosstalk when test, two conducting wires at the end P1, the connection of the end P2 on connecting terminal CN and the end S1, the end S2 connect
Two conducting wires connect are preferably located remotely from each other, and human body should not touch p-wire.
Test terminates, switch SW Self-resetting to position 0, the first luminous tube L1, the second luminous tube L2 self-sustaining and mutually closes
Lock releases, and battery BAT is by DE normally closed contact in second group of the 9th resistance R9, switch SW two-way contact SW-1 to first capacitor C1
Charging is prepared for test next time.In order to make first capacitor C1 fully charged, the test interval should be not less than 5 seconds.
In present embodiment, first diode D1, the second diode D2 are all made of silicon diode, backward resistance and forward direction
Resistance is the bigger the better before being connected.
In present embodiment, for the 5th capacitor C5 for inhibiting induced voltage, capacity should be not less than 100nF.Capacity is anti-greatly
It is strong to disturb ability.
If the end S1 of connecting terminal CN, the end S2 and do not connected to the conducting wire between electricity measurer, in Integrated circuit IC
The second luminous tube L2 can be lighted by mistake after electricity.Therefore, this phenomenon is eliminated using eleventh resistor R11.Experiment discovery, the
The resistance value of 11 resistance R11 should not exceed 100k Ω, while eleventh resistor R11 also provides discharge channel for the 5th capacitor C5.
In present embodiment, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 are integrated for setting
The bias voltage of two voltage comparators in IC circuit guarantees that its input terminal voltage is without departing from permission model under any circumstance
It encloses.Meanwhile 3rd resistor R3, the 4th resistance R4 are also used to set the differentiation voltage of two voltage comparators.Differentiate that voltage more connects
Nearly bias voltage, circuit sensitivity are higher.
In present embodiment, Integrated circuit IC specifically uses LM393P.Integrated circuit IC can usually use disposable type
Twin voltage comparator.In view of low temp operation, operating temperature lower limit is advisable with -25 DEG C.Integrated circuit IC operating voltage model
It encloses for 2~36V.When powering on, 8. for voltage during rising to 2V, voltage comparator output state is unstable for Integrated circuit IC foot
It is fixed, therefore, the first luminous tube L1, the first optocoupler P1, third optocoupler P3 series arm and the second luminous tube L2, the second optocoupler P2,
The operating voltage of 4th optocoupler P4 series arm need to be in 4V or more, and voltage comparator output state is unstable in power up
Problem is just shielded.
First luminous tube L1, the second luminous tube L2 branch complete self-sustaining and mutually locking using optocoupler.Third optocoupler P3,
There are distribution capacity and resistance in the dark, distribution capacity and resistance in the darks to be likely to result in the first luminous tube L1, for the output end of 4th optocoupler P4
The false triggering of two luminous tube L2.Therefore, third capacitor C3, the 7th resistance R7, the 4th capacitor C4, the 8th resistance are set in circuit
R8 eliminates this possibility, makes the first luminous tube L1 and the second luminous tube L2 will not false triggering.Third capacitor C3, the 4th capacitor C4
Capacitance should not exceed 10nF, otherwise can drag down circuit sensitivity.
The generic polar test circuit voltage range of the utility model is wide, and up to 6~36V, battery BAT electricity can be with
It is fully used.With the raising of operating voltage, first capacitor C1 discharge current is increased, while differentiating voltage and bias voltage
Difference also widened, circuit sensitivity variation simultaneously it is little.Due to differentiating that the difference of voltage and bias voltage is widened, circuit anti-interference
Ability improves.
When testing, first capacitor C1 is it is possible that reverse charging phenomenon.By setting third diode D3 come
First capacitor C1 is protected, its reverse charging voltage is limited in 0.7V or less.
In present embodiment, battery BAT uses 9V laminated cell.When battery BAT voltage is lower than 6V, the first luminous tube L1,
Second luminous tube L2 brightness is faint.It should be noted that when battery BAT voltage is lower than 6V, due to the first luminous tube L1, the second hair
Light pipe L2 branch self-sustaining and locking function decline, and polarity detection result will misalignment.In fact for 9V laminated cell, end electricity
It forces down and is needed replacing when 7.2V.
In present embodiment, switch SW uses 2A, 50V, two groups of two-way contacts, Self-resetting, three positions.When position 0, two groups
Common junction and respective normally closed contact in two-way contact are connected；When position 1, common junction in the 1st group of two-way contact with
Its normal opened contact is connected the 2nd group of two-way contact state simultaneously and is remained unchanged；Common junction when position 2, in two groups of two-way contacts
All connected with respective normal opened contact.Benefit using Self-resetting three position switch is: only powering in test, extends electricity
The pond service life.If not using Self-resetting three position switch, forget that closing power supply can make to consume battery BAT electricity in vain after test
Amount increases testing cost.
In present embodiment, the first luminous tube L1, Φ 3, green；Second luminous tube L2, Φ 3, it is red.
In present embodiment, first capacitor C1 is 1mF35V, electrolysis.Second capacitor C2 is 1 μ F35V, electrolysis.Third capacitor
C3 is 1nF10V, terylene.4th capacitor C4 is 1nF10V, terylene.5th capacitor C5 is 100nF10V, terylene.
In present embodiment, first resistor R1 and second resistance R2 are 10k Ω/0.25W.3rd resistor R3, the 4th electricity
Hindering R4 is 100 Ω/0.25W.5th resistance R5 and the 6th resistance R6 is 2k Ω/1W.7th resistance R7, the 8th resistance R8 are equal
For 100k Ω/0.25W.9th resistance R9 is 200 Ω/1W.Tenth resistance R10 is 2 Ω/2W.Eleventh resistor R11 be 68k Ω/
0.25W。
In present embodiment, the 4th optocoupler P4 of the first optocoupler P1- is all made of P521.
In present embodiment, first diode D1, the second diode D2 and third diode D3 are all made of 1N4007.
In present embodiment, connecting terminal CN is 2A/50V.
With the application for the current transformer that the increase of transformer capacity in power grid and secondary rated current are 1A, power grid
Interior current transformer ratio is increasing.Current transformer polarity chron is measured using battery, pointer gauge, current transformer ratio is got over
Its big smaller polarity test of secondary output electric current is more difficult.Electric current conversion can be carried out, exactly will once apply electric current when testing
Secondary current is obtained divided by current transformer ratio.Current transformer polarity chron is measured using battery, pointer gauge, discovery is when secondary
Polarity detection can actually survey no-load voltage ratio below 1000/1 with regard to highly difficult when electric current is less than 3mA.Voltage comparator inputs biased electrical
Stream is nA grades, and two input terminal pressure differences can be overturn in mV grades of output ends, can be sensitive by circuit easily using voltage comparator
Degree improves an order of magnitude or more.In present embodiment, circuit can survey no-load voltage ratio and be up to 10000/1 or more, can to current and
The current transformer of all no-load voltage ratios carries out polarity test in the following power grid.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
Claims (9)
1. a kind of generic polar tests circuit characterized by comprising battery, integrated circuit, the first optocoupler, the second optocoupler, the
Three optocouplers, the 4th optocoupler, the first luminous tube, the second luminous tube, first diode, the second diode, third diode, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
Ten resistance, eleventh resistor, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, switch, connecting terminal；
The end P2 of the connecting terminal, second resistance one end, integrated circuit foot 4., third optocoupler foot 3., the 4th optocoupler foot 3.,
Two capacitor cathode, third diode cathode, battery cathode, the connection of first capacitor cathode；
The anode, the normal opened contact in first group of two-way contact of switch, the connection of the 9th resistance one end；
Common junction, the second capacitance cathode, the 4th capacitor one end, the 8th resistance one in first group of two-way contact of the switch
End, the second luminous tube anode, the second optocoupler foot 4., the first optocoupler foot 4., the first luminous tube anode, the 7th resistance one end, third
Capacitor one end, integrated circuit foot 8., first resistor one end connection；
The 9th resistance other end is connect with the normally closed contact in second group of two-way contact of switch；
The first capacitor anode is connect with the common junction in second group of two-way contact of switch；
Normal opened contact, third diode cathode, the connection of the tenth resistance one end in second group of two-way contact of the switch；
The connection of the end P1 of the tenth resistance other end and connecting terminal；
The end S1 of the connecting terminal, first diode anode, the second diode cathode, the 5th capacitor one end, eleventh resistor
One end, integrated circuit foot are 2., 5. integrated circuit foot connects；
The end S2 of the connecting terminal, first diode cathode, the second diode cathode, the 5th capacitor other end, the 11st electricity
Hinder the other end, 3rd resistor one end, the connection of the 4th resistance one end；
3. the first resistor other end, the 3rd resistor other end are connect with integrated circuit foot；
6. the second resistance other end, the 4th resistance other end are connect with integrated circuit foot；
1. the first luminous tube cathode is connect with the first optocoupler foot；
2. 1. the first optocoupler foot is connect with third optocoupler foot；
The third optocoupler foot 2., the third capacitor other end, the 7th resistance other end, the 5th resistance one end, the second optocoupler foot 3.
Connection；
The integrated circuit foot is 1., 4. the 5th resistance other end, third optocoupler foot connect；
1. the second luminous tube cathode is connect with the second optocoupler foot；
2. 1. the second optocoupler foot is connect with the 4th optocoupler foot；
The 4th optocoupler foot 2., the 4th capacitor other end, the 8th resistance other end, the 6th resistance one end, the first optocoupler foot 3.
Connection；
The integrated circuit foot is 7., 4. the 6th resistance other end, the 4th optocoupler foot connect；
The integrated circuit use twin voltage comparator LM393P, operating temperature lower limit be -25 DEG C, operating voltage range be 2~
36V。
2. a kind of generic polar according to claim 1 tests circuit, which is characterized in that test starts, and will switch by position
Set it is 0 electric by being obtained using integrated circuit as the circuit of core to position 1, at this point, the voltage between the end S1 and the end S2 of connecting terminal is
Zero, two voltage comparator homophase input terminal potentials in integrated circuit are all higher than reverse input end current potential, and two voltages compare
Device all exports high potential, and the first luminous tube, the second luminous tube are all in OFF state；
Switch is pressed by position 1 to position 2, first capacitor discharges to the first optocoupler and the second optocoupler circuit by the tenth resistance；
The end S1 of connecting terminal, the induced voltage at the end S2 are added to after first diode and the second diode limiting, the 5th capacitor filtering
The input terminal of two voltage comparators in integrated circuit；If the S1 terminal potential of connecting terminal is higher than first resistor and third electricity at this time
Tie point current potential is hindered, then 1. integrated circuit foot exports low potential, and the first luminous tube lights sending green light, while third optocoupler is to the
One luminous tube self-sustaining, the first optocoupler are latched the second luminous tube, illustrate that current transformer polarity mark to be measured is correct；If at this time
The S1 terminal potential of connecting terminal is lower than the 4th resistance and second resistance tie point current potential, then 7. integrated circuit foot exports low potential,
Second luminous tube lights sending feux rouges, while the 4th optocoupler, to the second luminous tube self-sustaining, the second optocoupler closes the first luminous tube
Lock illustrates that current transformer polarity mark to be measured is wrong.
3. a kind of generic polar according to claim 2 tests circuit, which is characterized in that test terminates, and switchs Self-resetting
To position 0, the first luminous tube, the second luminous tube self-sustaining and mutual lock release, battery pass through the 9th resistance, second group of switch
Normally closed contact in two-way contact SW-1 charges to first capacitor, prepares test next time.
4. a kind of generic polar according to claim 1 tests circuit, which is characterized in that the integrated circuit uses
LM393P；First luminous tube, Φ 3, green；Second luminous tube, Φ 3 are red；The first capacitor is 1mF35V,
Electrolysis；Second capacitor is 1 μ F35V, electrolysis；The third capacitor is 1nF10V, terylene；4th capacitor is
1nF10V, terylene；5th capacitor is 100nF10V, terylene；The first resistor and second resistance be 10k Ω/
0.25W；The 3rd resistor, the 4th resistance are 100 Ω/0.25W；5th resistance and the 6th resistance are 2k Ω/1W；
7th resistance, the 8th resistance are 100k Ω/0.25W；9th resistance is 200 Ω/1W；Tenth resistance is 2
Ω/2W；The eleventh resistor is 68k Ω/0.25W；- the four optocoupler of first optocoupler is all made of P521；Described 1st
Pole pipe, the second diode and third diode are all made of 1N4007；The connecting terminal is 2A/50V；The battery is folded using 9V
Layer battery.
5. a kind of generic polar according to claim 1 tests circuit, which is characterized in that the first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance are for setting the bias voltage of two voltage comparators in integrated circuit；The 3rd resistor,
4th resistance is used to set the differentiation voltage of two voltage comparators in integrated circuit.
6. a kind of generic polar according to claim 1 tests circuit, which is characterized in that the switch using 2A/50V,
Two groups of two-way contacts, Self-resetting three position switch；When position 0, common junction in two groups of two-way contacts normally closed connects with respective
Point is connected；When position 1, common junction and its normal opened contact in the 1st group of two-way contact connect the 2nd group of two-way contact state simultaneously
It remains unchanged；When position 2, the common junction in two groups of two-way contacts is all connected with respective normal opened contact.
7. a kind of generic polar according to claim 1 tests circuit, which is characterized in that first luminous tube, second
Luminous tube branch completes self-sustaining and mutually locking using the first optocoupler, the second optocoupler, third optocoupler, the 4th optocoupler.
8. a kind of generic polar according to claim 1 tests circuit, which is characterized in that pass through third diode protection the
Its reverse charging voltage is limited in 0.7V hereinafter, guaranteeing to occur without reversely charging electrical phenomena by one capacitor.
9. a kind of generic polar according to claim 1 tests circuit, which is characterized in that when test, by connecting terminal
The end P1, the end P2 are connect with the low-voltage side coil of current transformer to be measured, by the end S1 of connecting terminal, the end S2 and Current Mutual Inductance to be measured
The high pressure lateral coil of device connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820506548.7U CN208506234U (en) | 2018-04-10 | 2018-04-10 | A kind of generic polar test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820506548.7U CN208506234U (en) | 2018-04-10 | 2018-04-10 | A kind of generic polar test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208506234U true CN208506234U (en) | 2019-02-15 |
Family
ID=65295786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820506548.7U Withdrawn - After Issue CN208506234U (en) | 2018-04-10 | 2018-04-10 | A kind of generic polar test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208506234U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226846A (en) * | 2018-04-10 | 2018-06-29 | 国家电网公司 | A kind of generic polar test circuit |
-
2018
- 2018-04-10 CN CN201820506548.7U patent/CN208506234U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226846A (en) * | 2018-04-10 | 2018-06-29 | 国家电网公司 | A kind of generic polar test circuit |
| CN108226846B (en) * | 2018-04-10 | 2020-02-07 | 国家电网公司 | General polarity test circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101149399B (en) | Digital multimeter for automatically selecting measuring function | |
| CN102243286B (en) | Apparatus for detecting and displaying grounding state of equipment or socket | |
| CN203838286U (en) | Current transformer polarity tester | |
| CN206209042U (en) | Instrument for testing polarity of current transformer | |
| CN202649380U (en) | Digital cable insulation fault automatic locator | |
| CN102004213B (en) | Direct-detection type intelligent direct-current system insulation and state diagnosis instrument | |
| CN108226846A (en) | A kind of generic polar test circuit | |
| CN208506234U (en) | A kind of generic polar test circuit | |
| CN106291226A (en) | Residual current transformer failure detector circuit and electrical fire-detector | |
| CN108181545A (en) | A kind of polarity test circuit for current transformer | |
| CN105182173B (en) | Novel composite mutual inductor polarity tester | |
| CN108120933A (en) | Asymmetric battery detection device | |
| CN206132836U (en) | Current inspecting circuit and device | |
| CN109459641A (en) | Alternating-current charging pile tests circuit and its test device | |
| CN202815146U (en) | Polarity detector for mutual inductor | |
| CN204832412U (en) | Novel combined instrument transformer polarity test appearance | |
| CN202057749U (en) | Instrument for detecting and displaying ground state of equipment or socket | |
| CN209432939U (en) | A kind of high-power transformer second protection polarity test device | |
| CN110672984A (en) | Portable direct current system ground fault detection device | |
| CN201607509U (en) | Transformer sleeve CT polarity inspection instrument | |
| CN206863157U (en) | Instrument for testing polarity of current transformer | |
| CN107957568A (en) | Secondary Circuit of Potential Transformer multipoint earthing Quick positioning instrument and lookup method | |
| CN213302497U (en) | Current transformer secondary side loop detection device and circuit | |
| CN210347884U (en) | DC power supply simulation grounding test device | |
| CN208013402U (en) | A kind of achievable built-in switch fault detect takes control intelligent electric energy meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190215 Effective date of abandoning: 20200207 |