CN105137276B - CT polarity test devices - Google Patents
CT polarity test devices Download PDFInfo
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- CN105137276B CN105137276B CN201510523031.XA CN201510523031A CN105137276B CN 105137276 B CN105137276 B CN 105137276B CN 201510523031 A CN201510523031 A CN 201510523031A CN 105137276 B CN105137276 B CN 105137276B
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- 238000012360 testing method Methods 0.000 title claims abstract description 36
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- 238000002474 experimental method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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Abstract
A kind of CT polarity test devices, it includes：First resistor (R1), second resistance (R2), 3rd resistor (RS), diode (D), relay (CJ), first switch (AN1), second switch (AN2), the 3rd switch (AN3), single-pole double-throw switch (SPDT) (K2), switch (K1), the first dc source (EC1), the second dc source (EC2), the first light emitting diode (LED1), the second light emitting diode (LED2).The present invention fully meets being actually needed for relay protection working site; have the characteristics that test is sensitive, easy to operate, be easy to carry, be reliable and practical; work on the spot efficiency can be greatly improved; and test lamplight pointing is directly perceived, specific; electronic component power consumption is few; cost is low, and power consumption is low, available for prolonged test.
Description
Technical field
The present invention relates to electric power apparatus examination, electric instrument technical field of measurement and test, more particularly to a kind of CT polarity tests dress
Put.
Background technology
Current transformer (Current transformer, abbreviation CT) is according to electromagnetic induction principle, primary side high current
Secondary side low current is converted into use, it is generally made up of the iron core and winding that close.Its first side winding string is needing to survey
In the circuit of the electric current of amount, secondary side winding is serially connected in measuring instrumentss and protective loop.Current transformer is at work, secondary
Side loop is closure all the time, and the working condition of current transformer can not open a way close to short circuit, secondary side.
In the secondary production work of power system, the work such as the current transformer replacing that frequently involves, major repair project, it is necessary to
Test current transformer polarity.Current transformer incorrect polarity may cause the consequences such as protective relaying device malfunction, tripping, to electricity
The reliability service of net causes tremendous influence.
At present, current transformer polarity testing is divided into two methods：
A kind of is using the polarity of current transformer test instrument test current transformer, such a method of testing testing time
It is long, and the testing crew needed is also relatively more, and especially some old transformer station experiment power supplies are less, and power supply, which connects, draws difficulty,
Virtually add the time in whole test.
Another kind is the method for common dry cell test polarity.Specifically, use common dry cell and ammeter string
Connect and form, such a method of testing flows through an electric current to transformer primary side, and secondary side induces a low current, passes through judgement
Sense of current judges the polarity of current transformer.It is if current transformer ratio is larger, then secondary to induce
Electric current will be very small, and this required precision to secondary side current table is very high, and cost is just very high, and the method can not be to becoming
Good reaction is made than bigger current transformer.
The content of the invention
It is an object of the invention to provide a kind of CT polarity test devices, to realize that test is sensitive, dynamic range is big, be easy to
Carry, current transformer polarity testing simple to operate.
To achieve these goals, technical scheme is as follows：
A kind of CT polarity test devices, it includes：First resistor (R1), the first end of first resistor (R1) are connected to second
The first end of (AN2) is switched, the second end of first resistor (R1) is connected to a diode (D) anode, second switch (AN2)
Second end is connected to the first of a single-pole double-throw switch (SPDT) (K2) the not moved end, first end, second resistance of a switch (K1) simultaneously
(R2) first end；The negative electrode of diode (D) is connected to a relay (CJ) first input end, the first of 3rd resistor (RS)
End, the second input of relay (CJ) are connected to single-pole double-throw switch (SPDT) (K2) moved end, and the second end of 3rd resistor (RS) connects
It is connected to the first end of the 3rd switch (AN3)；Wherein, relay (CJ) at least has two groups of output nodes, the respectively first output
Node (CJ-1) and the second output node (CJ-2), and the second output node (CJ-2) is normally opened node, the first output node
(CJ-1) it is normally closed node；The negative pole of second dc source (EC2) is connected to the second end of the 3rd switch (AN3), single-pole double throw
Second not moved end, the negative electrode of the first light emitting diode (LED1), the negative electrode of the second light emitting diode (LED2) of (K2) is switched, the
The positive pole of two dc sources (EC2) is connected to the second end of switch (K1)；The first output node (CJ-1) of relay (CJ) is even
It is connected between the second end of second resistance (R2), the anode of the first light emitting diode (LED1), the second output of relay (CJ)
Node (CJ-2) be connected to the second end of second resistance (R2), the second light emitting diode (LED2) anode between.
Preferably, in above-mentioned CT polarity test devices, in addition to：First dc source (EC1), and with the first direct current
The first switch (AN1) of power supply (EC1) connection.
Preferably, in above-mentioned CT polarity test devices, first switch (AN1), second switch (AN2), the 3rd switch
(AN3) it is button switch.
Analysis understands that the present invention fully meets being actually needed for relay protection working site, has and tests sensitive, operation side
Just the features such as, being easy to carry, be reliable and practical, work on the spot efficiency can be greatly improved, and tests lamplight pointing intuitively, specifically,
Electronic component power consumption is few, and cost is low, and power consumption is low, available for prolonged test.
Brief description of the drawings
Fig. 1 is the basic circuit diagram of the embodiment of the present invention；
Fig. 2 is the relay CJ of embodiment of the present invention elementary diagram.
Embodiment
The present invention is described in further details with reference to the accompanying drawings and detailed description.
Fig. 1 shows the circuit structure of the embodiment of the present invention, and its connection knot between Current Transmit
Structure.
As shown in figure 1, the embodiment of the present invention include first resistor R1, second resistance R2,3rd resistor RS, diode D, after
Electrical equipment CJ, first switch AN1, second switch AN2, the 3rd switch AN3, single-pole double-throw switch (SPDT) K2, switch K1, the first dc source
EC1, the second dc source EC2, the first LED 1, the second LED 2.
Specifically, first resistor R1 first end is connected to second switch AN2 first end, and the second of first resistor R1
End is connected to diode D anode, and second switch AN2 the second end is connected to the first of single-pole double-throw switch (SPDT) K2 the not moved end simultaneously
K21, first end, the second resistance R2 first end for switching K1.
Diode D negative electrode is connected to relay CJ first input end, 3rd resistor RS first end, relay CJ's
Second input is connected to single-pole double-throw switch (SPDT) K2 moved end, and 3rd resistor RS the second end is connected to the of the 3rd switch AN3
One end.As shown in Fig. 2 relay CJ at least has two groups of output nodes, the outputs of respectively the first output node CJ-1 and second
Node CJ-2, and the second output node CJ-2 is normally opened node, the first output node CJ-1 is normally closed node.Relay CJ is inputted
The positive pole at end is connected between diode D and 3rd resistor RS, relay CJ input cathodes and single-pole double-throw switch (SPDT) K2 moved end
It is connected.When relay CJ electric currents are flowed into by positive pole, the second output node CJ-2 closures, the first output node CJ-1 disconnect.When
When relay CJ electric currents are flowed into by negative pole, the first output node CJ-1 closures, the second output node CJ-2 disconnect.Relay CJ's
First output node CJ-1 be connected to second resistance R2 the second end, the first LED 1 anode between, relay
CJ the second output node CJ-2 be connected to second resistance R2 the second end, the second LED 2 anode between.
Second dc source EC2 negative pole be connected to the 3rd switch AN3 the second end, single-pole double-throw switch (SPDT) K2 second not
Moved end K22, the negative electrode of the first LED 1, the negative electrode of the second LED 2, the second dc source EC2 is just
Pole is connected to switch K1 the second end.
The first switch AN1 that first dc source EC1 is connected with the first dc source EC1 can not collect to take structure outside
Into in foregoing circuit structure.
Preferably, first switch AN1, second switch AN2, the 3rd switch AN3 are button switch.
During concrete application of the embodiment of the present invention, it is divided into three processes substantially, is respectively：
First, the course of work
Before work, by switch K1 closures, the lamp of the first LED 1 for power supply instruction is bright, now illustrates this reality
Applying example can use.Single-pole double-throw switch (SPDT) K2 is switched into " work " position, i.e., the first not moved end K21, can now be surveyed
Examination.
Its positive pole is connected, born to take power supply outside by the first dc source EC1 with the primary side terminals P 1 of Current Transmit
Pole is connected with the side of primary side terminals P 2 of Current Transmit.First switch AN1 testing button is pressed, now current transformer
CT primary sides have electric current to flow through, and secondary side induces electric current and flowed out by terminal S1, and flow successively through diode D, relay CJ, list
Double-pole double throw switch K2, then flow back to the secondary side terminal S2 of Current Transmit.Now, relay CJ forward streams overcurrent is moved
Make, the second output node CJ-2 closures, the first output node CJ-1 disconnect.Now, the second dc source EC2 electric current flows according to this
Switch K1, second resistance R2, the second output node CJ-2, the second LED 2 for characterizing same polarity are crossed, is formed
Loop, now the second LED 2 is luminous, represents Current Transmit experiment as same polarity.
2nd, involution process
Because the present embodiment using relay CJ is magnetism holding type relay, after relay CJ is acted, the second output section
Point CJ-2 can be kept closed, therefore be provided with involution loop.
External circuit, switch K1 closures are disconnected, single-pole double-throw switch (SPDT) K2 is beaten to the first not moved end K21.Now press the 3rd
AN3 involution button is switched, electric current is flowed through switch K1, single-pole double-throw switch (SPDT) K2, relay by the second dc source EC2 positive poles successively
Device CJ, 3rd resistor RS, the 3rd switch AN3, then flow back to the second dc source EC2 negative poles.Now relay CJ is flowed counterflow through
Electric current, the first output node CJ-2 closures, the second output node CJ-2 disconnect, and now the first LED 1 is luminous, extensive
The multiple state to before testing.
3rd, self-check of device process
There is corresponding service life in view of relay CJ, therefore, the present embodiment devises self-test loop to detect relay
Device CJ situation.
Before self-test, will switch K1 closures, single-pole double-throw switch (SPDT) K2 is switched into test position, i.e., the second not moved end K22.This
When press second switch AN2 debugging button, form loop.Electric current is flowed out by the second dc source EC2 positive poles, is flowed successively through out
K1, second switch AN2, first resistor R1, diode D, relay CJ, single-pole double-throw switch (SPDT) K2 are closed, then flows back to the second direct current
Power supply EC2 negative poles.Now, relay CJ input forward stream overcurrent, relay CJ actions, the second output node CJ-2 are closed
Close, the first output node CJ-1 disconnects, the second dc source EC2 electric current flows successively through switch K1, second resistance R2, second defeated
Egress CJ-2, the second LED 2, loop is formed, if the second LED 2 is luminous, it was demonstrated that relay CJ
Normal use can be continued.
To sum up, the present invention can realize small volume, be easy to carry, be easy to use and other effects, change traditional test side
Formula, substantially increases work on the spot efficiency, and tests that lamplight pointing is directly perceived, specific, and electronic component power consumption is few, available for growing
The test of time.
As known by the technical knowledge, the present invention can pass through the embodiment party of other essence without departing from its spirit or essential feature
Case is realized.Therefore, embodiment disclosed above, for each side, all it is merely illustrative, is not only.Institute
Have within the scope of the present invention or be included in the invention in the change being equal in the scope of the present invention.
Claims (3)
- A kind of 1. CT polarity test devices, it is characterised in that including：First resistor (R1), the first end of first resistor (R1) are connected to second switch (AN2) first end, first resistor (R1) The second end be connected to a diode (D) anode, the second end of second switch (AN2) is connected to a single-pole double-throw switch (SPDT) simultaneously (K2) first not moved end, one switch (K1) first end, the first end of second resistance (R2)；The negative electrode of diode (D) is connected to a relay (CJ) first input end, the first end of 3rd resistor (RS), relay (CJ) the second input is connected to single-pole double-throw switch (SPDT) (K2) moved end, and the second end of 3rd resistor (RS) is connected to the 3rd and opened Close the first end of (AN3)；Wherein, relay (CJ) at least has two groups of output nodes, respectively the first output node (CJ-1) With the second output node (CJ-2), and the second output node (CJ-2) is normally opened node, and the first output node (CJ-1) is normally closed Node；The negative pole of second dc source (EC2) is connected to the second end of the 3rd switch (AN3), the second of single-pole double-throw switch (SPDT) (K2) Not moved end, the negative electrode of the first light emitting diode (LED1), the negative electrode of the second light emitting diode (LED2), the second dc source (EC2) positive pole is connected to the second end of switch (K1)；The first output node (CJ-1) of relay (CJ) is connected to the second end of second resistance (R2), the first light emitting diode (LED1) between anode, the second output node (CJ-2) of relay (CJ) is connected to the second end of second resistance (R2), Between the anode of two light emitting diodes (LED2).
- 2. CT polarity test devices according to claim 1, it is characterised in that also include：First dc source (EC1), and the first switch (AN1) being connected with the first dc source (EC1).
- 3. CT polarity test devices according to claim 2, it is characterised in that first switch (AN1), second switch (AN2), the 3rd switch (AN3) is button switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510523031.XA CN105137276B (en) | 2015-08-24 | 2015-08-24 | CT polarity test devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510523031.XA CN105137276B (en) | 2015-08-24 | 2015-08-24 | CT polarity test devices |
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| Publication Number | Publication Date |
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| CN105137276A CN105137276A (en) | 2015-12-09 |
| CN105137276B true CN105137276B (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510523031.XA Active CN105137276B (en) | 2015-08-24 | 2015-08-24 | CT polarity test devices |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683043A (en) * | 2018-12-28 | 2019-04-26 | 北京强度环境研究所 | It is a kind of to minimize wireless polarity check instrument and solenoid valve polarity test system |
Citations (7)
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|---|---|---|---|---|
| CN201066369Y (en) * | 2007-05-23 | 2008-05-28 | 中国石化集团胜利石油管理局电力管理总公司 | Polarity tester for current mutual inductor |
| CN201607509U (en) * | 2009-11-13 | 2010-10-13 | 甘肃省电力公司白银供电公司 | Transformer sleeve CT polarity inspection instrument |
| CN201681135U (en) * | 2010-05-14 | 2010-12-22 | 宁夏电力公司银川供电局 | Polarity tester of current transformer |
| CN202141775U (en) * | 2011-06-07 | 2012-02-08 | 天津二十冶建设有限公司 | Instrument for testing polarity of current transformer |
| CN203551719U (en) * | 2013-09-26 | 2014-04-16 | 中冶华天工程技术有限公司 | Polarity detection device for current transformer |
| CN204203402U (en) * | 2014-11-12 | 2015-03-11 | 云南电网公司曲靖供电局 | A kind of proving installation of sleeve of main transformer current transformer polarity |
| CN204882789U (en) * | 2015-08-24 | 2015-12-16 | 国家电网公司 | CT polarity test device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5624588A (en) * | 1979-08-03 | 1981-03-09 | Toshiba Corp | Polarity detector for current transformer |
| JP4767048B2 (en) * | 2006-03-14 | 2011-09-07 | 中国電力株式会社 | Ratio ratio and polarity judgment method of current transformer, and apparatus therefor |
-
2015
- 2015-08-24 CN CN201510523031.XA patent/CN105137276B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201066369Y (en) * | 2007-05-23 | 2008-05-28 | 中国石化集团胜利石油管理局电力管理总公司 | Polarity tester for current mutual inductor |
| CN201607509U (en) * | 2009-11-13 | 2010-10-13 | 甘肃省电力公司白银供电公司 | Transformer sleeve CT polarity inspection instrument |
| CN201681135U (en) * | 2010-05-14 | 2010-12-22 | 宁夏电力公司银川供电局 | Polarity tester of current transformer |
| CN202141775U (en) * | 2011-06-07 | 2012-02-08 | 天津二十冶建设有限公司 | Instrument for testing polarity of current transformer |
| CN203551719U (en) * | 2013-09-26 | 2014-04-16 | 中冶华天工程技术有限公司 | Polarity detection device for current transformer |
| CN204203402U (en) * | 2014-11-12 | 2015-03-11 | 云南电网公司曲靖供电局 | A kind of proving installation of sleeve of main transformer current transformer polarity |
| CN204882789U (en) * | 2015-08-24 | 2015-12-16 | 国家电网公司 | CT polarity test device |
Non-Patent Citations (1)
| Title |
|---|
| GIS中电流互感器的极性检测方法;刘庆国 等;《湖北电力》;20050228;第29卷(第1期);第57-58页 * |
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