CN206863157U - Instrument for testing polarity of current transformer - Google Patents
Instrument for testing polarity of current transformer Download PDFInfo
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- CN206863157U CN206863157U CN201720750851.7U CN201720750851U CN206863157U CN 206863157 U CN206863157 U CN 206863157U CN 201720750851 U CN201720750851 U CN 201720750851U CN 206863157 U CN206863157 U CN 206863157U
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Abstract
Instrument for testing polarity of current transformer is the utility model is related to, is mainly made up of chip, voltage-regulator diode, diode, electric capacity, self-lock switch, light emitting diode, triode etc..By the normally closed node of self-lock switch, electric capacity is charged；During detection, press self-lock switch, electric capacity begins through the electric discharge of current transformer primary winding, secondary coil produces induced voltage, pass through voltage-regulator diode, diode, resistance, triode, pulse signal is provided for trigger in chip, corresponding light emitting diode is turned on after trigger output, observes the color of light emitting diode to judge the polarity of transformer.This test is discussed, suitable for all kinds of current transformer sense of current inspections.The device is easy to use, easy to operate, has saved manpower, alleviates labor intensity, improves the accuracy of checkability and polarity judgement.
Description
Technical field
Test, the inspection technology of electronic device are the utility model is related to, specifically judges current transformer polarity
Device.
Background technology
Current transformer is the important electric device of many electronic products, it have isolation between high and low pressure system and
The function that high pressure phasor is changed to low pressure phasor.
The correctness of current transformer connection, protection, measurement, supervision to the normal work, electrical system of equipment etc.
There is extremely important meaning.For protective relaying device, it is desirable to the polarity of current transformer has different polar configurations, because
This will carry out transducer check, testing the configuration of its polarity is when protective relaying device is newly installed or transformer is changed in overhaul
It is no correct：If polar configurations mistake, protection device malfunction or refused action will be caused：Refused action can cause to bypass the immediate leadership tripping operation (on i.e.
First class of protection trips)；Malfunction can cause the consequence of mistakenly stop electricity.
To avoid the reverse polarity connection of current transformer, it is necessary to find the Same Name of Ends of transformer input and output, i.e. " point pole
Property ".Fig. 1 is that conventional method judges the circuit theory diagrams of current transformer polarity, and E is 5V dc sources in figure, is sure to during wiring
Ensure that the polarity of each element is correct, otherwise can draw opposite result.
Conventional method current transformer examines the method and steps of its polarity to be：
1) pointer multimeter "+" test pencil is connected to transformer secondary coil " K1 " place, by pointer multimeter "-" test pencil
Transformer secondary coil " K2 " place is connected to, pointer multimeter is beaten to DC voltage shelves or DC current shelves, according to pointer-type
Universal meter deflection situation determines (typically using DC current shelves).
2) by after 1.5V dry cells 3-4 section series windings, its negative pole is connected to transformer primary winding " L2 " place, will test electric wire one
Head is connected to transformer primary winding " L1 " place, and the positive pole that the other end moment for testing electric wire is now connected to No. 1 dry cell (pays attention to
Contact should be reliable), now the pointer for producing induced potential is answered " positive deflection " on transformer secondary coil；Then suddenly will again
Test electric wire and No. 1 anode disconnects, pointer multimeter pointer answers " counter deflexion ", and the transformer is subtractive polarity.
Traditional this method of inspection, has the disadvantage that：
1st, visually observe pointer and error be present.Conventional method observes by the naked eye the pointer of table, to judge current transformer
Polarity, due to that pointer action unobvious or pointer change are excessive be present, therefore easily cause erroneous judgement；
2nd, conventional method is more using component, and wiring is complicated, and operating efficiency is low.Conventional method judges Current Mutual Inductance
The component that device polarity uses has：Pointer multimeter, dry cell, secondary line etc., because component is more and volume is larger, meeting
More manpower, time are consumed, battery storage little energy, consumption is fast, need to often change, and labor intensity is big, easily produces mistake
Judge.
3rd, during polarity test, battery polar, universal meter polarity will connect correctly, otherwise cause erroneous judgement.
Utility model content
The purpose of this utility model is, the shortcomings that overcoming the polarity inspection method of conventional current transformer to exist and not
Foot, there is provided one kind is easy to use, it is flexible, simple to operate to carry, accurately and reliably polarity test is discussed.
What the utility model was realized in：
The polarity test view of the current transformer, is mainly opened by chip 1, voltage-regulator diode 2, diode 3, electric capacity 4, self-locking
5, connection terminal 6, light emitting diode 7, triode 8, resistance 9 and inductance 10 is closed to form.After switching on power, pass through self-lock switch 5
Normally closed node, electric capacity 4 is charged, during detection, presses self-lock switch 5, its normally opened node conducting, electric capacity 4 begins through electric current
Transformer primary winding discharges, and secondary coil produces induced voltage, passes through voltage-regulator diode 2, diode 3, resistance 9, triode
8, pulse signal is provided for the trigger of chip 1, corresponding light emitting diode 7 is turned on after trigger output, observes light emitting diode
7 color judges the polarity of transformer.
The chip 1, model 74LS74, two independent rising edge d type flip flop 1-1 and 1-2 are included, by output
End Q and Q-, input end of clock CLK, data input pin D, directreset terminal CD (low level is effective), directly postpone hold SD (low electricity
It is flat effective) form.
The voltage-regulator diode 2, is made up of voltage-regulator diode 2-1,2-2,2-3；
The diode 3, is made up of diode 3-1,3-2,3-3；
The electric capacity 4, it is made up of 33pF filter capacitor 4-2 and a 1000uF charge and discharge electric capacity 4-1；
The self-lock switch 5, it is made up of two pairs of normally opened nodes, two pairs of normally closed nodes.When pressing, node 2- nodes 3, node
5- nodes 6 are connected；After involution, node 2- nodes 1, node 5- nodes 4 are connected；
The connection terminal 6, it is made up of the connection terminal 6-1 and 6-2 of two two pins；
The light emitting diode 7, it is made up of a red light emitting diodes 7-1 and green LED 7-2；
The triode 8, it is PNP type triode.
The test view use when working procedure be：
1st, when capacitor charges, trigger is reset, and indicator lamp does not all work.
2nd, during capacitor discharge, if positive polarity, then 3-1 is turned on, and CLKA high level, trigger 1-1 UIA are detected
Rising edge exports high level, and positive indicator lamp 7-1 is bright.
3rd, if negative polarity, 3-2,3-3,2-3 conducting, triode 8 turns on, and CLKK is high level, trigger 1-2
UIB detects that the reverse indicator lamp 7-2 of rising edge output high level is bright.
This test is discussed, suitable for the inspection of all kinds of current transformer polarity.The device is easy to use, easy to operate, significantly
Checkability is improved, has saved manpower, alleviates labor intensity, improves the standard judged being examined current transformer polarity
True property.
With reference to the accompanying drawings and examples, the utility model is described further.
Brief description of the drawings
Fig. 1 are the current transformer connection test view circuit diagram of traditional point-polarity
The charge-discharge circuit of Fig. 2 the present embodiment current transformer polarity testing view
Mu balanced circuit and pulse-generating circuit in Fig. 3 the present embodiment current transformer polarity testing view
Flip-flop circuit schematic diagram in Fig. 4 the present embodiment current transformer polarity testing view
Embodiment
A kind of polarity test view of current transformer of embodiment
Fig. 2 is the charge-discharge circuit of the present embodiment current transformer polarity testing view.
Self-lock switch 5 in figure, it is made up of two pairs of normally opened nodes, two pairs of normally closed nodes.When pressing, node 2 and node 3, section
Point 5 is connected with node 6, and circuit is discharged；After involution, node 2 and node 1, node 5 are connected with node 4, keep electric capacity
Charged state.9-1 is 10K resistance, plays metering function.4-1 is charging capacitor, after switching on power, charging capacitor charging.8-1、
8-2 is inductance, is strobed.6-1 is the binding post of two pins, 6-1 No. 1 binding post, connects current transformer once
The L1 of side；6-2 No. 2 binding posts, meet the L2 of current transformer primary side.
Fig. 3 is mu balanced circuit and pulse-generating circuit in the present embodiment current transformer polarity testing view.6-2 is two pins
Binding post, the K1 of 6-2 No. 1 binding post connection Current Transformer Secondary side, 6-2 No. 2 binding posts connection electric current
The K2 of transformer secondary side.4-2 electric capacity strobes.2-1,2-2,2-3 are voltage-regulator diode, and 3-1,3-2,3-3 are general
Logical diode, 2-1 voltage stabilizings in positive polarity, 2-3 voltage stabilizings in negative polarity, 9-4,9- 5,9-6 are that resistance plays metering function, 8
For triode.During positive polarity, then 3-1 is turned on, and CLKA is high level；During negative polarity, 3-2,3-3,2-3 conducting, triode are led
Logical, CLKK is high level.
Fig. 4 is trigger (74LS74 chips) circuit in the present embodiment current transformer polarity testing view：Fig. 4-1 is just
Polarity chron trigger 1-1 circuit diagrams, trigger 1-2 circuit diagrams when Fig. 4-2 is negative polarity.
74LS74 chips 1 include two independent rising edge d type flip flop 1-1 and 1-2, and each trigger is by output end
Q and Q-, input end of clock CLK, data input pin D, directreset terminal CD (low level is effective), directly postpone end SD (low levels
Effectively) form.Trigger 1-1 and trigger 1-2 data input pin D is all connected to VCC, and directset terminal SD is all connected to
VCC, directreset terminal CD are all connected to CLR, 1-1 output ends Q connections 9- 2 and 7-1,1-2 output end Q connection 9-3 and 7-2, touch
Hair device 1-1 input end of clock CLK ends are connected to CLKA, and trigger 1-2 input end of clock CLK ends are connected to CLKK.
Electric capacity 4-1 is charged, in charging, 1-1 and 1-2 is reset, and indicator lamp all do not work, by 4-1 to Current Mutual Inductance during detection
Device discharges, and then detects the output pulse direction of secondary side.
When electric capacity 4-1 discharges, if positive polarity, then 3-1 is turned on, and CLKA high level, trigger 1-1 UIA are detected
Rise bright along output high level, positive indicator lamp 7-1；If negative polarity, 3-2,3-3,2-3 conducting, triode 8 turn on.
CLKK11 is high level, and trigger 1-2 UIB detect that rising edge exports high level, and reverse indicator lamp 7-2 is bright.
Operating procedure when the current transformer polarity testing view of the present embodiment uses：
1st, by test view once, secondary side connector summation current transformer connects：No. 1 terminal for testing the 6-1 of view connects
The primary side L1,6-1 of current transformer No. 2 terminals meet the primary side L2 of current transformer；Test the 6-2 of view No. 1 terminal
No. 2 terminals for meeting the secondary side K1,6-2 of current transformer meet the secondary side K2 of current transformer.
2nd, switch on power, the power supply of the device is DC5V, and power interface is USB port, and general charger baby can provide.
3rd, self-lock switch is pressed, for when red just (to add) polarity, green light is negative (subtracting) polarity.
Claims (9)
1. instrument for testing polarity of current transformer, it is characterised in that：Mainly by chip (1), voltage-regulator diode (2), diode (3),
Electric capacity (4), self-lock switch (5), connection terminal (6), light emitting diode (7), triode (8), resistance (9), inductance (10) composition；
After switching on power, by the normally closed node of self-lock switch (5), electric capacity (4) is charged；During detection, self-lock switch (5) is pressed, its
Normally opened node conducting, electric capacity (4) begin through the electric discharge of current transformer primary winding, and secondary coil produces induced voltage, passed through
Voltage-regulator diode (2), diode (3), resistance (9), triode (8), pulse signal is provided for trigger in chip (1), triggered
Corresponding light emitting diode is turned on after device output
(7) color for, observing light emitting diode (7) judges the polarity of transformer.
2. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The chip (1), model
74LS74, includes two independent rising edge d type flip flops, each trigger by data input pin (D), output end (Q), when
Clock input (CLK), directreset terminal (CD), directly postpone end (SD) composition.
3. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The voltage-regulator diode (2), comprising
3 voltage-regulator diodes.
4. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The diode (3), includes 3
Diode.
5. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The electric capacity (4), by a 33pF
Filter capacitor and 1000uF charge and discharge electric capacity composition.
6. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The self-lock switch (5), by two pairs
Normally opened node, two pairs of normally closed node compositions.
7. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The connection terminal (6), by two
The connection terminal of two pins is formed.
8. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The light emitting diode (7), by one
Individual red light emitting diodes and a green LED composition.
9. instrument for testing polarity of current transformer according to claim 1, it is characterised in that：The triode (8) is positive-negative-positive three
Pole pipe；The inductance (10), is made up of two inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720750851.7U CN206863157U (en) | 2017-06-19 | 2017-06-19 | Instrument for testing polarity of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720750851.7U CN206863157U (en) | 2017-06-19 | 2017-06-19 | Instrument for testing polarity of current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206863157U true CN206863157U (en) | 2018-01-09 |
Family
ID=60828135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720750851.7U Active CN206863157U (en) | 2017-06-19 | 2017-06-19 | Instrument for testing polarity of current transformer |
Country Status (1)
| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132452A (en) * | 2017-06-19 | 2017-09-05 | 国网甘肃省电力公司白银供电公司 | Instrument for testing polarity of current transformer |
| CN110579676A (en) * | 2019-09-19 | 2019-12-17 | 国网辽宁省电力有限公司营口供电公司 | An automatic polarity detection device |
-
2017
- 2017-06-19 CN CN201720750851.7U patent/CN206863157U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132452A (en) * | 2017-06-19 | 2017-09-05 | 国网甘肃省电力公司白银供电公司 | Instrument for testing polarity of current transformer |
| CN110579676A (en) * | 2019-09-19 | 2019-12-17 | 国网辽宁省电力有限公司营口供电公司 | An automatic polarity detection device |
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