CN201035088Y - Device for testing main changing casing tube CT polar - Google Patents
Device for testing main changing casing tube CT polar Download PDFInfo
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- CN201035088Y CN201035088Y CNU2007200501299U CN200720050129U CN201035088Y CN 201035088 Y CN201035088 Y CN 201035088Y CN U2007200501299 U CNU2007200501299 U CN U2007200501299U CN 200720050129 U CN200720050129 U CN 200720050129U CN 201035088 Y CN201035088 Y CN 201035088Y
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- 238000012360 testing method Methods 0.000 title claims description 92
- 230000006698 induction Effects 0.000 claims description 10
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- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 abstract 1
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- 230000000087 stabilizing effect Effects 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
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Abstract
The utility model discloses a device for measuring CT polarity of main transformer bushing, comprising an interface unit for connecting with CT of the measured main transformer bushing, a CT primary polarity measuring unit for measuring primary polarity of CT of the main transformer bushing, a CT secondary polarity measuring unit for measuring the secondary polarity of CT of the main transformer bushing, a power supplying unit for supplying power for CT primary polarity measuring and CT secondary polarity measuring, a polarity displaying unit for amplifying secondary induced current of CT polarity measuring to transform into visual signals to display. The utility model can visually and accurately display CT polarity measuring results, and effectively avoid arching problem generated during rise of battery voltage.
Description
Technical field
The utility model relates to the measuring technology of electric system, relates in particular to a kind of device that is used to test the main transformer bushing CT polarity.
Background technology
In the main transformer protection replacing process of electric system; it is the Δ mode of connection that main transformer cannula C T secondary connection is adopted in the little difference protection of the main transformer of former conventional type; the protection rear sleeve CT secondary connection of being replaced by microcomputer type need be the Y mode of connection; promptly change the Y mode of connection into by the Δ mode of connection; as shown in Figure 1; wherein three of Y branches are called three-phase, i.e. A phase, B phase, C phase.
The polarity correctness direct relation protection of main transformer cannula C T and the correctness of secondary circuit; play a part to do important in secondary connection, not only main transformer differential protection will be noted CT polarity, every protection that involves direction; composite voltage direction overcurrent or the like for example all will be noted the polarity of CT.Assurance enters the polarity correctness of each road ac flow of protective device; it is the most basic key element of protection action message; therefore, in order to prevent to cause protective device malfunction, tripping, be very necessary to the CT polarity test of main transformer sleeve pipe because of the CT incorrect polarity.
Fig. 2 is the synoptic diagram that dry cell type main transformer bushing CT polarity tester of the prior art carries out the CT polarity test, wherein, Fig. 2 A is the synoptic diagram of external cabling, and Fig. 2 B is the inner equivalent synoptic diagram of transformer, wherein, frame of broken lines is a transformer internal driving equal-value map among Fig. 2 B.
Dry cell type main transformer bushing CT polarity tester shown in Fig. 2 adopts the dry cell of 9V that test CT polarity is powered, wherein, the DC ammeter range is below 100 microamperes, r0 is the dry cell batteries internal resistance, do not remember the influence of primary system ground capacitance and dry cell batteries internal resistance, wherein R is resistance in the main transformer, its resistance is bigger, according to Ohm law I=U/ (R+r0), it is small to form electric current in the loop, is difficult to form the secondary induction current, and this is because the transient response characteristic of current transformer, the time constant of primary system is big more, then exciting current is big more, and the progress of disease is more little to the electric current of secondary circuit, even there is induction current all very little, cause the DC ammeter needle deflection not obvious, thereby be difficult to judge the polarity of CT.
Fig. 3 is the synoptic diagram that direct supply type main transformer bushing CT polarity tester of the prior art carries out the CT polarity test, and wherein, Fig. 3 A is the synoptic diagram of external cabling, and Fig. 3 B is the inner equivalent synoptic diagram of transformer.
Direct supply type main transformer bushing CT polarity tester shown in Fig. 3 adopts the direct supply that adds that test CT polarity is powered.When using described CT polarity tester to carry out the CT polarity test, when disconnecting direct supply, can produce superpotential and arcing, seriously jeopardize operating personnel's safety at cut-off point.General external dc power supply method of testing does not allow, and can produce the hidden danger on many safety, for example, and DC earthing or the like.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of device that is used to test the main transformer bushing CT polarity is provided.Can intuitively and accurately show CT polarity test result, and avoid the arcing problem that produced at the cell voltage elevation process effectively.
In order to solve the problems of the technologies described above, the utility model proposes a kind of device of testing the main transformer bushing CT polarity, comprising:
The interface unit that is connected with tested main transformer cannula C T, comprise: be used to connect first terminals and second terminals of a polarity test mouth of tested main transformer cannula C T, and be used to connect the 3rd terminals and the 4th terminals of tested main transformer cannula C T secondary polarity test mouth;
Under the state that polarity test mouth of described first terminals and second terminals and described main transformer cannula C T is connected, polarity test unit of CT that polarity of CT of main transformer sleeve pipe is tested;
Under the state that the secondary polarity test mouth of described the 3rd terminals and the 4th terminals and described main transformer cannula C T is connected, the CT secondary polarity test unit that the CT secondary polarity of main transformer sleeve pipe is tested;
Be used to polarity test unit of described CT and CT secondary polarity test unit that the power supply unit of electric energy is provided;
Wherein, described device also comprises:
Secondary induction current during with described CT polarity test carries out processing and amplifying, and changes the polarity display unit that optical signal shows into.
Wherein, described power supply unit comprises:
The scalable electric battery comprises at least one Battery pack;
Be used to control the power switch of the state that switches on and off of described scalable electric battery and polarity test unit of described CT and CT secondary polarity test unit;
Be connected with described power switch, and connect, the extinguishing arc element that the extinguishing arc that reduces pressure when power switch is handled with described scalable electric battery.
Wherein, described extinguishing arc element is a diode.
Wherein, described polarity display unit specifically comprises:
The pulse current of the secondary induction during with described CT polarity test carries out the amplified current amplification module;
With the current transitions that is exaggerated of described electric current amplification module output is the signal conversion module of optical signal;
The signal display element that described optical signal is shown.
Wherein, described electric current amplification module comprises at least one in-phase amplifier:
Wherein, described signal conversion module comprises:
Be connected with described amplifier in the same way, be used under the function of current that described amplifier is in the same way exported, starting, and drive the driving light idol of starting relay.
Under the driving of described driving light idol, start, and the starting relay of driven for emitting lights diode.
Wherein, described signal display element is:
Light emitting diode, be used under the driving of relay luminous or extinguish, and by luminous and extinguish two states indication CT polarity test result.
Wherein, described device also comprises:
The reset button and the reset relay that are connected and constitute the loop with described light emitting diode respectively.
Implement the utility model, have following beneficial effect:
At first, CT secondary polarity test of the present utility model adds in-phase amplifier in the unit, the faradic weak current of secondary is carried out processing and amplifying, and change optical signal into, thereby can intuitively and accurately show CT polarity test result;
Secondly, the utility model adopts the scalable electric battery to power, and at power switch place reversal connection one extinguishing arc element, solves the arcing problem that is produced at the cell voltage elevation process with this
Description of drawings
Fig. 1 is the main transformer cannula C T secondary connection of prior art is changed into the Y mode of connection by the Δ mode of connection a synoptic diagram;
Fig. 2 is the synoptic diagram that dry cell type main transformer bushing CT polarity tester of the prior art carries out the CT polarity test;
Fig. 3 is the synoptic diagram that direct supply type main transformer bushing CT polarity tester of the prior art carries out the CT polarity test;
Fig. 4 is the structural representation of first embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model;
Fig. 5 is the structural representation of second embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model;
Fig. 6 is the structural representation of the 3rd embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model;
Fig. 7 is the structural representation of the 4th embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model.
Embodiment
Core of the present utility model is, a kind of device that is used to test the main transformer bushing CT polarity is provided, and can intuitively and accurately show CT polarity test result, and solves the arcing problem that is produced at the cell voltage elevation process.
Referring to Fig. 4, the structural representation for first embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model comprises:
When concrete test, described first terminals (polar end) insert on three-phase (A, B, C phase) the cannula C T guide line that main transformer uprises successively, uprising side C with test main transformer cannula C T below is example mutually, on the C phase sleeve pipe CT guide line that described first terminals (polar end) access main transformer uprises, described second terminals (non-polar end) insert main transformer and uprise on the zero sequence cannula C T guide line; Described the 3rd terminals (secondary polar end) and described the 4th terminals (secondary non-polar end) insert respectively on the terminal row of main transformer terminal box inner sleeve CT secondary extension line, test;
CT secondary polarity test unit 102 is used under the state that the secondary polarity test mouth of described the 3rd terminals and the 4th terminals and described main transformer cannula C T is connected the CT secondary polarity of main transformer sleeve pipe being tested;
Need to prove that in the present embodiment, power supply unit 103 is that voltage is the dry cell of 9V, adopt the 9V dry cell that power supply is provided, it is simple, easy to operate to have a wiring, characteristics such as safety.
Particularly, described polarity display unit 104 comprises:
Electric current amplification module 1040, the pulse current of the secondary induction when being used for described CT polarity test carries out processing and amplifying; In the time of specific implementation, described electric current amplification module 1040 is amplifier in the same way.
In specific implementation, described signal conversion module 1041 comprises:
Driving light idol connects described amplifier in the same way 1041, starts under the function of current that described amplifier in the same way 1040 is exported, and drives starting relay.
Starting relay starts under the driving of described driving light idol, and the driven for emitting lights diode.
Need to prove that the device that is used to test the main transformer bushing CT polarity of the present utility model also includes reset unit 105, is specially reset button 1050, under the state that is pressed, connect the branch road at described reset relay 1051 and light emitting diode place;
Specifically, when testing, when power connection, signal display element 1042, i.e. lumination of light emitting diode, when pressing reset button 1050, light emitting diode extinguishes; When power supply is connected once more, signal display element 1042, promptly light emitting diode is not luminous, proves that then a secondary polarity is identical, similarly, when pressing reset button 1050, light emitting diode extinguishes, when power supply was connected once more, light emitting diode or luminance proved that then a secondary polarity is opposite.
Referring to Fig. 5, be the structural representation of second embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model;
The difference of present embodiment and described first embodiment is, is used to provide the power supply unit 103 that carries out the required electric energy of polarity test of described CT and CT secondary polarity test specifically to comprise:
Scalable electric battery 1030 comprises at least one Battery pack, is used to the CT polarity test of different situations to supply with different electric energy;
Extinguishing arc element 1032 is used for and described power switch 1031 reversal connections, and connects with described scalable electric battery 1030, and the extinguishing arc that reduces pressure when power switch is handled.
Need to prove that adopt scalable electric battery 1030 that power supply is provided in the present embodiment, the 9V dry cell of adopting among first embodiment that compares provides power supply, and the characteristics such as power supply, extinguishing arc that provide flexibly are provided.
The composition of other unit of present embodiment and function are identical with described first embodiment.
Referring to Fig. 6, be the structural representation of the 3rd embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model;
As shown in Figure 6, the device that present embodiment provides is used to test the main transformer bushing CT polarity specifically comprises:
When concrete test, insert polarity terminals 1 on three-phase (A, B, C phase) the cannula C T guide line that main transformer uprises successively, uprising side C with test main transformer cannula C T is example mutually, on the C phase sleeve pipe CT guide line that described polar end terminals 1 access main transformer uprises;
Once nonpolar terminals 2 are used for uprising zero sequence cannula C T guide line with main transformer and are connected;
And be connected the power supply 3 that constitutes a polarity test loop between polarity terminals 1 and the once nonpolar terminals 2, and in the present embodiment, the power supply mode of power supply 3 is dry cells, it is simple to have a wiring, convenience operation.
The nonpolar terminals 5 of secondary polarity terminals 4 and secondary insert respectively on the main transformer terminal box inner sleeve CT secondary extension line;
What be connected with secondary polarity terminals 4 is resistance 6, and its effect is a dividing potential drop;
What be connected with described resistance 6 is the positive pole of in-phase amplifier 7, what be connected for a short time with the negative pole of described in-phase amplifier 7 is resistance 8, its effect is shunting, with shunt resistance 8 parallel resistor 9, its effect also is shunting, 10 of resistance are connected with the output terminal of in-phase amplifier, with in-phase amplifier parallel resistor 11, play a part shunting, drive light idol 12 and resistance 10, resistance 11, the branch road series connection at resistance 8 places is after the electric current of secondary induction amplifies through in-phase amplifier 7, drive 12 conductings of light idol, diode 13 is connected with the nonpolar terminals 5 of secondary, and effect is when secondary non-polar end 5 produces back electromotive force, by the secondary circuit conducting; Ground connection 14 and ground connection 15 are respectively applied for avoids leak source, guarantees handling safety.
What be connected with driving light idol 12 is respectively resistance 20 and relay 21, under the power supply of dry cell 16, drive light idol 12 and drive relay 21, need to prove that what connect with dry cell 16 is resistance 17, be used for dividing potential drop, electric capacity 18 and stabilivolt 19 are in parallel with the branch road at dry cell 16 and resistance 17 places respectively, and its effect is shunting and voltage stabilizing;
When pressing reset button 24, the resetting coil R of relay 21 starts, and contact returns light emitting diode 24, by the luminous of light emitting diode 24 or extinguish the polarity that two states can pick out main transformer cannula C T intuitively, equally, with reset button 24 resistance 25 that is in series, play the dividing potential drop effect.
Definite, when pressing reset button 24, light emitting diode 23 is not luminous, and this kind situation illustrates that a secondary polarity is identical, if when pressing reset button 24, light emitting diode 23 continues luminous, and this kind situation illustrates that a secondary polarity is opposite.
Referring to Fig. 7, be the structural representation of the 4th embodiment of the device that is used to test the main transformer bushing CT polarity of the present utility model;
As shown in Figure 7, the device that present embodiment provides is used to test the main transformer bushing CT polarity specifically comprises:
When concrete test, insert polarity terminals 1 on three-phase (A, B, C phase) the cannula C T guide line that main transformer uprises successively, uprising side C with test main transformer cannula C T is example mutually, on the C phase sleeve pipe CT guide line that described polar end terminals 1 access main transformer uprises;
Once nonpolar terminals 2 are used for uprising zero sequence cannula C T guide line with main transformer and are connected;
And be connected the scalable electric battery 30 that constitutes a polarity test loop between polarity terminals 1 and the once nonpolar terminals 2, and comprise at least one Battery pack, be used to the CT polarity test of different situations to supply with different electric energy; Specifically, adopted a plurality of dry cell batteries to replace the form of a Battery pack and external dc power supply, realized by the L shorting stub, when one group of 9V dry cell is not enough, can regulate the L shorting stub, one grade of every adjusting, with regard to boosted voltage 9V, thereby reach the purpose of boosted voltage.
What connect with scalable electric battery 30 is power switch 32, be used to control the state that switches on and off in described scalable electric battery 30 and polarity test loop of CT and CT secondary polarity test loop, the other end at power switch 32 also is in series with diode 31, when power switch is closed, its impedance is very big, think its open circuit, when power switch disconnects, diode 31 serves as fly-wheel diode, its impedance is very little, thinks its short circuit, adopts this mode of connection, fundamentally solve power switch and gone out to produce overvoltage, avoided the arcing problem.
Need to prove that adopt scalable electric battery 30 that power supply is provided in the present embodiment, the 9V dry cell of adopting among the 3rd embodiment that compares provides power supply, and the characteristics such as power supply, extinguishing arc that provide flexibly are provided.
The nonpolar terminals 5 of secondary polarity terminals 4 and secondary insert respectively on the main transformer terminal box inner sleeve CT secondary extension line;
What be connected with secondary polarity terminals 4 is resistance 6, and its effect is a dividing potential drop;
What be connected with described resistance 6 is the positive pole of in-phase amplifier 7, what be connected for a short time with the negative pole of described in-phase amplifier 7 is resistance 8, its effect is shunting, with shunt resistance 8 parallel resistor 9, its effect also is shunting, 10 of resistance are connected with the output terminal of in-phase amplifier, with in-phase amplifier parallel resistor 11, play a part shunting, drive light idol 12 and resistance 10, resistance 11, the branch road series connection at resistance 8 places is after the electric current of secondary induction amplifies through in-phase amplifier 7, drive 12 conductings of light idol, diode 13 is connected with the nonpolar terminals 5 of secondary, and effect is when secondary non-polar end 5 produces back electromotive force, by the secondary circuit conducting; Ground connection 14 and ground connection 15 are respectively applied for avoids leak source, guarantees handling safety.
What be connected with driving light idol 12 is respectively resistance 20 and relay 21, under the power supply of dry cell 16, drive light idol 12 and drive relay 21, need to prove that what connect with dry cell 16 is resistance 17, be used for dividing potential drop, electric capacity 18 and stabilivolt 19 are in parallel with the branch road at dry cell 16 and resistance 17 places respectively, and its effect is shunting and voltage stabilizing;
When pressing reset button 24, the resetting coil R of relay 21 starts, and contact returns light emitting diode 24, by the luminous of light emitting diode 24 or extinguish the polarity that two states can pick out main transformer cannula C T intuitively, equally, with reset button 24 resistance 25 that is in series, play the dividing potential drop effect.
Definite, when pressing reset button 24, light emitting diode 23 is not luminous, this kind situation illustrates that a secondary polarity is identical, if when pressing reset button 24, when drawing back power switch 32 again, light emitting diode 23 continues luminous, and this kind situation illustrates that a secondary polarity is opposite.
Need to prove, power turn-on switch 32 and when drawing back power switch 32 when a secondary is opposite polarity, light emitting diode 24 is all luminous, be because when drawing back power switch 32, produce back electromotive force, it is luminous to utilize produce back electromotive force driven for emitting lights diode 24 at CT secondary non-polar end this moment, so power turn-on switch 32 and draw back power switch 32, light emitting diode 24 is all luminous; In like manner, when a secondary polarity is identical, draw back power switch 32, light emitting diode 24 also can be luminous, is that CT secondary non-polar end produces back electromotive force equally, but play a reversed role diode 13 of the nonpolar terminals 5 of secondary comes by the loop conducting in the secondary circuit, in the time of just can realizing power turn-on switch 32, light emitting diode 24 is luminous, after resetting, draw back power switch 32, light emitting diode 24 is not luminous.
It is emphasized that, the device of the test main transformer bushing CT polarity among the various embodiment provided by the utility model can be used for detecting the zero sequence CT of the above main transformer of 15MVA equally, the same polarity and some the internal resistance Chinese People's Anti-Japanese Military and Political College that is used for above circuit of 110KV and the common CT of 10KV switch cubicle of detecting is difficult to equipment of determining polarity or the like.
Above disclosed only is a kind of preferred embodiment of the utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (8)
1. device that is used to test the main transformer bushing CT polarity comprises:
The interface unit that is connected with tested main transformer cannula C T, comprise: be used to connect first terminals and second terminals of a polarity test mouth of tested main transformer cannula C T, and be used to connect the 3rd terminals and the 4th terminals of tested main transformer cannula C T secondary polarity test mouth;
Under the state that polarity test mouth of described first terminals and second terminals and described main transformer cannula C T is connected, polarity test unit of CT that polarity of CT of main transformer sleeve pipe is tested;
Under the state that the secondary polarity test mouth of described the 3rd terminals and the 4th terminals and described main transformer cannula C T is connected, the CT secondary polarity test unit that the CT secondary polarity of main transformer sleeve pipe is tested;
Be used to polarity test unit of described CT and CT secondary polarity test unit that the power supply unit of electric energy is provided;
It is characterized in that described device also comprises:
Secondary induction current during with described CT polarity test carries out processing and amplifying, and changes the polarity display unit that optical signal shows into.
2. the device that is used to test the main transformer bushing CT polarity as claimed in claim 1 is characterized in that, described power supply unit comprises:
The scalable electric battery comprises at least one Battery pack;
Be used to control the power switch of the state that switches on and off of described scalable electric battery and polarity test unit of described CT and CT secondary polarity test unit;
Be connected with described power switch, and connect, the extinguishing arc element that the extinguishing arc that reduces pressure when power switch is handled with described scalable electric battery.
3. the device that is used to test the main transformer bushing CT polarity as claimed in claim 1 is characterized in that, described polarity display unit specifically comprises:
The pulse current of the secondary induction during with described CT polarity test carries out the amplified current amplification module;
With the current transitions that is exaggerated of described electric current amplification module output is the signal conversion module of optical signal;
The signal display element that described optical signal is shown.
4. the device that is used to test the main transformer bushing CT polarity as claimed in claim 2 is characterized in that, described extinguishing arc element is a diode.
5. the device that is used to test the main transformer bushing CT polarity as claimed in claim 3 is characterized in that, described electric current amplification module comprises a homophase amplifier at least.
6. as each described device that is used to test the main transformer bushing CT polarity in the claim 3 to 5, it is characterized in that described signal conversion module comprises:
Be connected with described amplifier in the same way, be used under the function of current that described amplifier is in the same way exported, starting, and drive the driving light idol of starting relay.
Under the driving of described driving light idol, start, and the starting relay of driven for emitting lights diode.
7. as each described device that is used to test the main transformer bushing CT polarity in the claim 3 to 5, it is characterized in that described signal display element is a light emitting diode.
8. the device that is used to test the main transformer bushing CT polarity as claimed in claim 7 is characterized in that, described device also comprises:
The reset button and the reset relay that are connected and constitute the loop with described light emitting diode respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200501299U CN201035088Y (en) | 2007-04-09 | 2007-04-09 | Device for testing main changing casing tube CT polar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200501299U CN201035088Y (en) | 2007-04-09 | 2007-04-09 | Device for testing main changing casing tube CT polar |
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| Publication Number | Publication Date |
|---|---|
| CN201035088Y true CN201035088Y (en) | 2008-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200501299U Expired - Fee Related CN201035088Y (en) | 2007-04-09 | 2007-04-09 | Device for testing main changing casing tube CT polar |
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| CN (1) | CN201035088Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762771B (en) * | 2009-07-23 | 2012-08-08 | 西安爱邦电子系统有限公司 | Wiring analysis method for bus differential protecting CT loop in electric system |
| CN104330763A (en) * | 2014-11-24 | 2015-02-04 | 云南电网公司曲靖供电局 | Test method for bushing current transformer of main transformer |
| CN104764976A (en) * | 2015-04-24 | 2015-07-08 | 国家电网公司 | Experimental device for testing transformer substation current transformer |
| CN105652216A (en) * | 2016-03-23 | 2016-06-08 | 哈尔滨飞机工业集团有限责任公司 | Detection circuit for helicopter alternating current power supply system |
| CN111751766A (en) * | 2020-06-28 | 2020-10-09 | 深圳供电局有限公司 | A kind of main transformer bushing current transformer polarity detection method |
| CN112180028A (en) * | 2020-08-14 | 2021-01-05 | 安徽德亚电池有限公司 | Device and method for non-aqueous detection of free acid content of electrolyte |
| CN112684381A (en) * | 2020-12-03 | 2021-04-20 | 广东电网有限责任公司中山供电局 | CT polarity tester of hand-held type wireless transmission sampling |
-
2007
- 2007-04-09 CN CNU2007200501299U patent/CN201035088Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762771B (en) * | 2009-07-23 | 2012-08-08 | 西安爱邦电子系统有限公司 | Wiring analysis method for bus differential protecting CT loop in electric system |
| CN104330763A (en) * | 2014-11-24 | 2015-02-04 | 云南电网公司曲靖供电局 | Test method for bushing current transformer of main transformer |
| CN104764976A (en) * | 2015-04-24 | 2015-07-08 | 国家电网公司 | Experimental device for testing transformer substation current transformer |
| CN105652216A (en) * | 2016-03-23 | 2016-06-08 | 哈尔滨飞机工业集团有限责任公司 | Detection circuit for helicopter alternating current power supply system |
| CN105652216B (en) * | 2016-03-23 | 2018-05-29 | 哈尔滨飞机工业集团有限责任公司 | A kind of Helicopter AC power-supply system detection circuit |
| CN111751766A (en) * | 2020-06-28 | 2020-10-09 | 深圳供电局有限公司 | A kind of main transformer bushing current transformer polarity detection method |
| CN112180028A (en) * | 2020-08-14 | 2021-01-05 | 安徽德亚电池有限公司 | Device and method for non-aqueous detection of free acid content of electrolyte |
| CN112684381A (en) * | 2020-12-03 | 2021-04-20 | 广东电网有限责任公司中山供电局 | CT polarity tester of hand-held type wireless transmission sampling |
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