CN101188355A - Method for converting the end electric screen current of mutual inductor into line voltage and insulation line monitoring device - Google Patents
Method for converting the end electric screen current of mutual inductor into line voltage and insulation line monitoring device Download PDFInfo
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- CN101188355A CN101188355A CNA2007101783653A CN200710178365A CN101188355A CN 101188355 A CN101188355 A CN 101188355A CN A2007101783653 A CNA2007101783653 A CN A2007101783653A CN 200710178365 A CN200710178365 A CN 200710178365A CN 101188355 A CN101188355 A CN 101188355A
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Abstract
The invention discloses a method which takes the second side voltage of a bus voltage transformer as the reference, utilizes a digit type digital line protection device to cause the terminal electric screen current of a capacitive current transformer to be changed into line voltage to substitute the use of the second voltage of a line current transformer device, and simultaneously carries out online monitoring for the insulating status of the current transformer. The voltage amplitude and the phase precision of the line voltage converted by terminal electric screen current depends on the precision of the second side voltage of a bus voltage transformer, and the invention has much more advantages than the prior line voltage extracting device. The explosion of a capacitive insulating oiling type current transformer is usually led by insulation drop. The insulation drop can cause the terminal electric screen current and a dielectric loss factor tg Delta to be changed and leads the variation of the voltage of the terminal electric screen current. The invention implements online monitoring for the insulation variation of the current transformer, and the invention can prevent the serious accident caused by the insulation drop of the current transformer from happening and is favorable for the implement of condition-based maintenance.
Description
Technical field
The present invention relates to field of power; relate more specifically to the method for relaying protection, supervisory control system; become line voltage distribution by capacitive current transformer end electric screen current conversion; replace line voltage distribution instrument transformer secondary voltage to use, simultaneously the insulation situation of current transformer is carried out on-line monitoring for protective device.
Background technology
The above electric power system of 35kV makes Current Transformer, the overwhelming majority adopts capacitor type insulating, capacitive current transformer (hereinafter to be referred as capacitor type TA) is the equally distributed oil-impregnated paper insulation product of electric capacity, its internal structure is outside lead, the circular concentric capacitance plate surrounds more than 10 layers in employing " U " shape, wherein, insulation thickness is equal to each other between each adjacent electric screen, and the capacitance plate tip lengths from inside outwards becomes step-like arrangement, ground connection after outermost layer is drawn back by end screen binding post and earth terminal links.Because its primary circuit axially reaches radial electric field and is evenly distributed, therefore Main Insulation Structure of Electric rationally and be fully utilized can improve the insulation level of TA.
Electric capacity between lead and the end screen is called end screen electric capacity, and CM represents with symbol;
End screen terminal connects current in loop and is called end screen electric current with earth terminal, IM represents with symbol.
Generally between 500 to 1500pf, the power frequency capacitive reactance ZCM of electric capacity is shielded at various capacity end to the capacitance of end screen electric capacity, and the end screen electric current I M under each electric pressure is as shown in table 1:
The power frequency capacitive reactance ZCM of the various capacity of table 1 end screen electric capacity, the end screen electric current I under each electric pressure
MTable
| Cm(pf) | 500 | 600 | 700 | 800 | 900 | 1000 |
| Zcm(kΩ) | 6366.2 | 5305.2 | 4547.3 | 3978.9 | 3536.8 | 3183.1 |
| 66kVIm(ma) | 6.0 | 7.2 | 8.4 | 9.6 | 10.8 | 12.0 |
| 110kVIm(ma) | 10.0 | 12.0 | 14.0 | 16.0 | 18.0 | 20.0 |
| 220kVIm(ma) | 20.0 | 23.9 | 27.9 | 31.9 | 35.9 | 39.9 |
| 330kVIm(ma) | 29.9 | 35.9 | 41.9 | 47.9 | 53.9 | 59.9 |
| 500kVIm(ma) | 45.3 | 54.4 | 63.5 | 72.6 | 81.6 | 90.7 |
| Cm(pf) | 1100 | 1200 | 1300 | 1400 | 1500 | 1600 |
| Zcm(kΩ) | 2893.7 | 2652.6 | 2448.5 | 2273.6 | 2122.6 | 1989.4 |
| 66kVIm(ma) | 13.2 | 14.4 | 15.6 | 16.8 | 18.0 | 19.2 |
| 110kVIm(ma) | 21.9 | 23.9 | 25.9 | 27.9 | 29.9 | 31.9 |
| 220kVIm(ma) | 43.9 | 47.9 | 51.9 | 55.9 | 59.8 | 63.8 |
| 330kVIm(ma) | 65.8 | 71.8 | 77.8 | 83.8 | 89.8 | 95.8 |
| 500kVIm(ma) | 99.8 | 108.8 | 117.9 | 127.0 | 136.0 | 145.1 |
Because manufacturing process defective, unreasonable structure, poor sealing and inner unholinessly cause the current transformer that causes such as creepage to damage to happen occasionally.
The consequence great majority that oil immersion type current transformer damages are blasts, and the blast of current transformer can cause large-area power-cuts, because blast tends to damage neighbouring device, are difficult in the short time restore electricity comprehensively.
The defective of current transformer inside is opened up to retransmitting by light, to such an extent as to obviously only rely on regular high voltage test can not prevent to damage the generation of explosion accident.Have only and it is carried out on-line monitoring in time find defective, be only basic solution.On-line monitoring is highly beneficial to implementing " repair based on condition of component ".
The prelude that current transformer damages is that built-in electrical insulation descends, capacitor discharge etc. is shielded at the end, above-mentioned phenomenon occurs end screen electric current is changed.Gave the alarm above 5% o'clock in variation as long as can monitor end screen electric current, notify the operations staff to handle, just realized on-line monitoring the current transformer internal flaw.
Summary of the invention
Bus TV all is installed on all buses, when circuit is in normal operating condition, the variation that bus TV can the correct response line voltage distribution, but open-phase operation appears when circuit, under the situation that line-breaker disconnects, bus TV just can not correctly reflect the variation of line voltage distribution even; And circuit TV under any circumstance all can correctly reflect the variation of line voltage distribution, so route protection is wished line attachment TV operation especially.Circuit TV is installed need increase investment and maintenance cost, becomes line voltage distribution to use for protective device last electric screen current conversion, does not lose not only the scheme of good but also province.Line voltage distribution through converting to is compared with the bus TV reference voltage of access device, just can carry out on-line monitoring, and " on-Line Monitor Device " is one of popular especially topic of present electric power system the state of insulation of current transformer.The present invention can solve above-mentioned two big technical problems simultaneously.
It is that line voltage distribution replaces line voltage distribution instrument transformer secondary voltage to use for protective device that the present invention adopts capacitive current transformer end electric screen current conversion, and the method comprising the steps of:
The earth connection of capacitive current transformer end electric screen terminal is removed, and between capacitive current transformer end electric screen terminal and ground, inserted loop of voltage regulation;
Insert current transformer (BLQ) between capacitive current transformer end electric screen terminal and ground, realize the high-low pressure isolation, the current transformer that will move under nominal system voltage simultaneously end electric screen electric current (Im) converts 100mA level current signal to;
Current signal after the conversion is input in the digital on-Line Monitor Device by cable;
According to cable length in (3) step, calculate the resistance value of each core cable, and according to the last electric screen electric current (Im) of the current transformer of the real-time detection current value after by the current transformer conversion, the voltage drop of calculating the current transformer secondary side;
The magnetic permeability of and iron core long-pending according to current transformer (BLQ) core section according to the computational methods of Industrial Frequency Transformer, calculates the coil turn that the every volt voltage of current transformer (BLQ) needs coiling at least;
The iron core bobbin is divided into inside and outside two-layer, internal layer is a winding N1, outer coiling secondary winding
N2 is by the number of turn of the winding of turns calculations of outer winding;
According to the number of turn of current transformer one secondary winding, calculate no-load voltage ratio, and consider the voltage drop of current transformer secondary side, by capacitive current transformer end electric screen electric current (Im) value that is input to the 100mA level current signal calculating actual detected in the digital on-Line Monitor Device;
When calculating normal the operation, the angle (Ψ A, Ψ B, Ψ C) of the A phase voltage of capacitive current transformer A, B, the leading bus-bar potential transformer TV of C three-phase end electric screen electric current, and should be worth in the storage computation machine;
When calculating normal the operation, the effective value U of bus TV secondary voltage shields ratio K A, KB, the KC of current effective value IA, IB, IC and is stored in the computer in the end mutually with each;
Last electric screen current value with (7) each phase actual detected of calculating of step, according to the effective value U of the angle (Ψ A, Ψ B, Ψ C) of the A phase voltage of the leading bus TV of capacitive current transformer A, B, C three-phase end electric screen electric current and bus TV secondary voltage with each mutually end ratio K A, KB, KC of shielding current effective value IA, IB, IC pass through phase angular transformation and amplitude transformation, be transformed into the line voltage signal of corresponding phase;
Replace line voltage distribution instrument transformer secondary voltage to use the line voltage distribution that obtains for protective device.
The line voltage distribution that utilizes last electric screen current conversion to become is compared with busbar voltage the insulation situation of current transformer is carried out on-line monitoring, with capacitive current transformer end electric screen current conversion is the numerical value of line voltage distribution, and this numerical value and bus TV secondary side phase voltage amplitude error were above 5% o'clock; Or the harmonic voltage error surpasses at 10% o'clock in this numerical value and the bus TV secondary side phase voltage, sends the insulation alarm signal, and quote occur unusual separate.
Since line voltage distribution instrument transformer secondary voltage can the correct response line voltage distribution variation.Use line voltage distribution instrument transformer secondary voltage to differentiate circuit various " power directions ", calculate all kinds of impedances in the distance protection, obviously be better than bus-bar potential transformer, some defencive function requires necessary line attachment voltage transformer secondary voltage operation even.Simultaneously, capacitor type insulating oil-filling type current transformer explosion is the initiation because insulation descends often, and insulation descends last electric screen electric current and dielectric dissipation factor tg δ are changed, and causes the variation of last electric screen current conversion voltage.When the amplitude of variation of last electric screen current conversion voltage surpasses ± 5%, send " the current transformer insulation changes Threshold Crossing Alert ", notify the relevant personnel to handle.
Therefore; the present invention is a benchmark with bus-bar potential transformer secondary side voltage; utilize digital line protective devices; capacitor type insulating type current transformer end electric screen current conversion is become line voltage distribution; replace line voltage distribution instrument transformer secondary voltage to use, simultaneously the insulation situation of current transformer is carried out the method for on-line monitoring for protective device.Insulation changes the enforcement on-line monitoring for the sensitivity that improves relaying protection and to current transformer, prevents in a large number the generation of the serious accident of initiation because the current transformer insulation descends, and the enforcement that is beneficial to " repair based on condition of component " is significant.
Description of drawings
Fig. 1 becomes line voltage distribution and instrument transformer insulation line monitoring device input electric parameters schematic diagram for capacitive current transformer end electric screen current conversion;
Fig. 2 judges the logic relation picture of instrument transformer insulation by the line voltage distribution value of current transformer end electric screen current conversion for basis.
Embodiment
The method that end electric screen current conversion becomes line voltage distribution, current transformer (TA) insulation line monitoring device input electric parameters is as shown in Figure 1:
Among Fig. 1:
1 is winding of TA
2 (ZHZ) are line protective devices or on-Line Monitor Device
C
m: be TA end electric screen electric capacity
I
m: be last electric screen electric current
BLQ: be last electric screen current convertor device
I
2: be the last electric screen electric current after the BLQ conversion
U: be bus TV secondary voltage for correction usefulness
In last electric screen capacitor C
mLast electric screen terminal and earth terminal between insert loop of voltage regulation, between last electric screen terminal and earth terminal and meet current transformer BLQ, by cable the current transformer secondary side is connected with on-Line Monitor Device ZHZ, simultaneously the last electric screen current signal I after the conversion
2Input to on-Line Monitor Device ZHZ, simultaneously bus TV secondary voltage U is inputed to on-Line Monitor Device ZHZ.
Current transformer BLQ uses R8 coiling unshakable in one's determination among Fig. 1, mainly contains two effects:
First effect is to realize the high and low pressure isolation;
Second effect is the current transformer end screen electric current (Im) that will move under nominal system voltage, becomes I
2After about=100ma, use 1.5mm
2Cable connection is in digital on-Line Monitor Device.
1.5mm
2Every kilometer resistance of cable is about 11.7 Ω, if cable length calculates according to 200m, the resistance of every core cable is 2.34 Ω, now calculates according to 2.5 Ω.When flowing through the 100ma electric current in the cable core, voltage is reduced to 0.25V.
Because minimum can the ignoring of current transformer impedance in the device, current transformer secondary side voltage can calculate according to 0.25V during therefore normal the operation.
The R8 area of core section is 1.565cm
2, permeability unshakable in one's determination is calculated according to 1.6T, calculates according to Industrial Frequency Transformer, and every volt needs coiling 18 circles at least.
R8 bobbin unshakable in one's determination is divided into inside and outside two-layer, and is outer with 0.5 enamelled wire coiling secondary winding N
2, get N
2=180 circles;
Internal layer is used for winding of coiling, the number of turn N of a winding
1Calculate according to following formula:
By table 1 as seen, the last electric screen electric current of m is 6ma, and then N1 needs coiling 3000 circles at most.R8 internal layer bobbin coiling unshakable in one's determination area is greater than 1cm
2, last electric screen electric current can use 0.125 enamelled wire coiling during less than 30ma, and the ampacity of 0.125 enamelled wire is 30ma;
End electric screen electric current is 30ma, and then N1 needs coiling 600 circles.End electric screen electric current can use 0.28 enamelled wire coiling during greater than 30ma, and the ampacity of 0.28 enamelled wire is 154ma;
By table 1 as seen, maximum last electric screen electric current is 145.1ma, less than 154ma, so the numerical value of the last electric screen electric current that provides according to the user of a winding of current transformer, in above-mentioned two kinds of enamelled wires, select one to get final product.
When last electric screen electric current was 6ma, the terminal voltage Umax of a winding of current transformer calculated according to following formula:
Select for use the 1.5KE18CA Transient Suppression Diode as the voltage stabilizing element in the loop of voltage regulation 4.
On-Line Monitor Device 6 must be a digital device, such as the current transformer on-Line Monitor Device of special development, digital supervisory control system, digital line protective devices etc.
Wherein should preferentially select digital line protective devices.
In order to insert three-phase end screen electric current, on-Line Monitor Device must be provided with three 250ma/3.53V current transformers.
Three 57.73V/3.35V voltage transformers preferably can be set, use as reference voltage for inserting bus TV secondary side phase voltage.
Be provided with two groups in some digital line protective devices and amount to 4 voltage transformers.
First group is provided with 3 57.73V/3.35V voltage transformers, inserts circuit TV (bus TV) the secondary side phase voltage of using for protection.
Because circuit TV secondary side voltage all can the correct response line voltage distribution under any running status, when open-phase operation appears in circuit, bus TV just can not the correct response line voltage distribution.Such as, the high frequency locking negative sequence power direction protection under the non-full-operating state that a side disconnects, meeting malfunction when TA is connected on bus bar side then can malfunction when being connected on the line side.
Therefore route protection is wished the operation of line attachment TV secondary voltage especially, circuit TV is not installed and can not realizes but suffer from a lot of circuits.
Second group is provided with 1 voltage transformer, mainly for checking that the electric parameters reclosing uses.
Second group of voltage transformer, can insert phase voltage also can tie-in line voltage.
When first group of transformer inserts bus TV voltage, second group of transformer line attachment TV voltage then; Otherwise when first group of transformer line attachment TV voltage, then second group of transformer inserts bus TV voltage.
When digital line protective devices double as on-Line Monitor Device is used, require first group of transformer is replaced by the 250ma/3.53V current transformer, insert three-phase end screen electric current; For convenient analysis, second group of transformer of calculation requirement insert bus TV secondary side A phase voltage.
One " end screen current conversion conversion program " is set in " on-Line Monitor Device ".
The conversion of end screen electric current is a benchmark with the bus TV secondary voltage of device input.
" end screen current conversion conversion program " is provided with " beginning conversion " and " EOC " two orders by the input of device panel upper keyboard.
After end screen electric current, bus TV voltage insert " on-Line Monitor Device ", " begin to change " order with the input of panel upper keyboard.
After " end screen current conversion conversion program " receives " beginning conversion " order, be benchmark, measure the phase place and the amplitude of three-phase end screen electric current respectively with the bus TV secondary A phase voltage of installing input.
A, B, C three-phase voltage are balances under the normal operation, establish three-phase bus TV secondary voltage and are respectively:
If three-phase end screen electric current is respectively when being benchmark with A phase bus TV secondary voltage:
In the following formula: Ψ
A, Ψ
B, Ψ
CBe respectively A, B, the preceding bus A phase TV level angle of C three-phase end screen electric current neck.With Ψ
A, Ψ
B, Ψ
CBe stored in the computer.
Three-phase end screen electric current is led preceding in the angle Ψ of bus with famous prime minister TV secondary voltage respectively
AT, Ψ
BT, Ψ
CTBe respectively:
Ψ
AT＝Ψ
A (7)
Ψ
BT＝Ψ
B-240° (8)
Ψ
CT＝Ψ
C-120° (9)
The effective value U that calculates bus TV secondary voltage respectively shields current effective value I in the end mutually with each
A, I
B, I
CRatio K
A, K
B, K
CAnd be stored in the computer.
K
A＝U/I
A (10)
K
B＝U/I
B (11)
K
C＝U/I
C (12)
Three-phase end screen current conversion is become phase voltage of the same name.
Three-phase end screen current conversion is become and phase voltage same-phase of the same name:
With the A end screen electric current Ψ that turns clockwise mutually
AAfter, just can with bus A TV secondary side voltage homophase mutually;
The last mutually screen electric current of B is turned clockwise (240 °-Ψ
B), just can with bus B TV secondary side voltage homophase mutually;
The last mutually screen electric current of C is turned clockwise (120 °-Ψ
C), just can with bus C TV secondary side voltage homophase mutually;
Three-phase end screen current conversion is become and phase voltage same-phase of the same name:
Get by (10) formula: U
A=K
AI
A, A is shielded electric current I in the end mutually
AEnlarge K
ADoubly, its amplitude is equated with TV secondary side phase voltage amplitude.
Get by (11) formula: U=K
BI
B, B is shielded electric current I in the end mutually
BEnlarge K
BDoubly, its amplitude is equated with TV secondary side phase voltage amplitude.
Get by (12) formula: U=K
CI
C, C is shielded electric current I in the end mutually
CEnlarge K
CDoubly, make its amplitude identical with TV secondary side phase voltage amplitude.
End screen electric current uses to be used as circuit TV secondary voltage after over-angle and amplitude conversion, and it is accurately identical with bus TV.
After " end screen current conversion conversion program " receives " EOC " order, fixing K to store in the transfer process
A, K
B, K
C, Ψ
A, Ψ
B, Ψ
C, end screen electric current is changed according to described method.
The logic determines of " on-Line Monitor Device " is sent alarm signal as shown in Figure 2 in the following cases, and quote occur unusual separate:
When surpassing 5% by end screen electric current conversion voltage and bus TV secondary side phase voltage amplitude error;
The harmonic voltage error is above 10% the time when transformed voltage and bus TV secondary side phase voltage by end screen electric current in.
Variation has taken place in the amplitude that error note end screen electric current appears in voltage magnitude, and error appears in harmonic voltage can suspect then whether TA inside exists anomalies such as discharge.
The on-line monitoring function aspects: when line-breaker disconnect or open-phase operation process median generatrix and line voltage distribution not wait be normal phenomenon, should withdraw from the on-line monitoring function in these cases.
Use with digital line protective devices double as on-Line Monitor Device, line voltage distribution does not allow to use before the screen current conversion of end, therefore should take to add measures such as " temporary protections " in transfer process.
Claims (8)
1. one kind is the method that line voltage distribution replaces line voltage distribution instrument transformer secondary voltage to use for protective device with capacitive current transformer end electric screen current conversion, and the method comprising the steps of:
(1) earth connection of capacitive current transformer end electric screen terminal is removed, and between capacitive current transformer end electric screen terminal and ground, inserted loop of voltage regulation;
(2) insert current transformer (BLQ) between capacitive current transformer end electric screen terminal and ground, realize the high-low pressure isolation, the current transformer that will move under nominal system voltage simultaneously end electric screen electric current (Im) converts 100mA level current signal (I to
2);
(3) current signal (I after the conversion
2) be input in the on-Line Monitor Device (ZHZ) by cable;
(4) according to the length of cable described in (3) step, calculate the resistance value of each core cable, and according to the last electric screen electric current (Im) of the current transformer of the real-time detection current signal (I after by the current transformer conversion
2), the voltage of calculating current transformer secondary side;
(5) magnetic permeability of and iron core long-pending according to current transformer (BLQ) core section according to the computational methods of Industrial Frequency Transformer, calculates the coil turn that the every volt voltage of current transformer (BLQ) needs coiling at least;
(6) the iron core bobbin is divided into inside and outside two-layer, internal layer is a winding, and outer coiling secondary winding is according to the number of turn of the winding of turns calculations of selected outer secondary winding;
(7) according to the number of turn of current transformer one secondary winding, calculate no-load voltage ratio, by the current signal (I that is input in the on-Line Monitor Device (ZHZ)
2) calculate capacitive current transformer end electric screen electric current (Im) value of actual detected;
When (8) calculating normal the operation, angle Ψ A, Ψ B, the Ψ C of the secondary voltage of capacitive current transformer A, B, the leading bus-bar potential transformer TV of C three-phase end electric screen electric current, and should be worth in the storage computation machine;
When (9) calculating normal the operation, the effective value U of bus TV secondary voltage shields ratio K A, KB, the KC of current effective value IA, IB, IC and is stored in the computer in the end mutually with each;
(10) the last electric screen current value (Im) of each phase actual detected that (7) step was calculated, according to the effective value U of the angle (Ψ A, Ψ B, Ψ C) of the secondary voltage of the leading bus TV of capacitive current transformer A, B, C three-phase end electric screen electric current and bus TV secondary voltage with each mutually end ratio K A, KB, KC of shielding current effective value IA, IB, IC pass through phase angular transformation and amplitude transformation, be transformed into the line voltage signal of corresponding phase;
(11) replace line voltage distribution instrument transformer secondary voltage to use the line voltage distribution that obtains for protective device.
2. guard method according to claim 1, described voltage stabilizing circuit realizes that as voltage stabilizing element described current transformer (BLQ) is by the R8 iron core winding by 4 1.5KE18CA Transient Suppression Diodes.
3. secondary winding number of turn N2=180 circle is got in guard method according to claim 2; Then the number of turn N1 of a winding calculates according to following formula:
I wherein
mBe capacitive current transformer end screen current value.
4. guard method according to claim 3, when last electric screen electric current during less than 30ma, one time winding uses 0.125 enamelled wire coiling; When last electric screen electric current during greater than 30ma, one time winding uses 0.28 enamelled wire coiling.
5. guard method according to claim 1; in order to insert three-phase end electric screen electric current; three 250ma/3.53V current transformers and three 57.73V/3.35V voltage transformers are set, and described three voltage transformers use as reference voltage for inserting bus TV secondary side voltage.
6. guard method according to claim 5, with described three 57.73V/3.35V voltage transformers as first group of voltage transformer, second group of voltage transformer also is set, and described second group of voltage transformer inserts phase voltage or line voltage, for checking that the electric parameters reclosing uses; When first group of voltage transformer inserts bus TV voltage, second group of voltage transformer line attachment TV voltage then.
7. a line voltage distribution that utilizes last electric screen current conversion to become is compared with busbar voltage and the insulation situation of current transformer is carried out the device of on-line monitoring, comprise: between the last electric screen terminal of capacitive current transformer and earth terminal, insert loop of voltage regulation, simultaneously between last electric screen terminal and earth terminal and connect current transformer (BLQ), by cable the current transformer secondary side is connected with on-Line Monitor Device (ZHZ), with the last electric screen current signal (I after the conversion
2) input in the on-Line Monitor Device (ZHZ), simultaneously bus TV secondary voltage is inputed to on-Line Monitor Device (ZHZ) as fiducial value, it is characterized in that, monitor the last electric screen electric current and the bus TV secondary side voltage of capacitive current transformer in real time, is the numerical value of line voltage distribution according to the method for claim 1 with capacitive current transformer end electric screen current conversion, when the numerical value of gained line voltage distribution and bus TV secondary side phase voltage amplitude error above 5% the time; Or the harmonic voltage error surpasses at 10% o'clock in this numerical value and the bus TV secondary side phase voltage, sends the insulation alarm signal, and quote occur unusual separate.
8. the device of on-line monitoring according to claim 7 when line-breaker disconnects or open-phase operation process median generatrix voltage and line voltage distribution when not waiting, withdraws from on-line monitoring.
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| CN101707127B (en) * | 2009-12-01 | 2011-06-29 | 中国西电电气股份有限公司 | Oil-immersed inverted current transformer with function of insulation online monitoring |
| US8370046B2 (en) | 2010-02-11 | 2013-02-05 | General Electric Company | System and method for monitoring a gas turbine |
| CN102801381A (en) * | 2012-08-15 | 2012-11-28 | 上海交通大学 | Controllable transformer device capable of controlling amplitude and phase angle of voltage individually and control method for same |
| CN102801381B (en) * | 2012-08-15 | 2014-10-29 | 上海交通大学 | Controllable transformer device capable of controlling amplitude and phase angle of voltage individually and control method for same |
| CN103091546A (en) * | 2013-01-12 | 2013-05-08 | 辽宁省电力有限公司鞍山供电公司 | Voltage extracting device |
| CN104360127B (en) * | 2014-06-25 | 2018-03-16 | 许继电气股份有限公司 | Arrester on-line monitoring is with voltage acquisition methods and obtains system |
| CN104360127A (en) * | 2014-06-25 | 2015-02-18 | 许继电气股份有限公司 | Method and system for acquiring arrester online monitoring voltage |
| CN105698860A (en) * | 2015-11-16 | 2016-06-22 | 任红霞 | Current transformer real-time on-line monitoring device |
| CN105783989A (en) * | 2015-11-16 | 2016-07-20 | 任红霞 | Current transformer real-time on-line monitoring device |
| CN106291038A (en) * | 2016-08-12 | 2017-01-04 | 山东亿玛信诺电气有限公司 | Secondary side current transformer not being afraid of open circuit and preparation method thereof |
| CN107332198A (en) * | 2017-08-02 | 2017-11-07 | 国网天津市电力公司 | A kind of 110kV capacitor-voltage detecting devices |
| CN107369544A (en) * | 2017-09-04 | 2017-11-21 | 云南电网有限责任公司电力科学研究院 | A kind of GIS formulas of band electromagnetic shielding are from the standard potential transformer that boosts |
| CN107369544B (en) * | 2017-09-04 | 2023-09-15 | 云南电网有限责任公司电力科学研究院 | GIS type self-boosting standard voltage transformer with electromagnetic shielding |
| CN111308311A (en) * | 2018-12-12 | 2020-06-19 | 北京金风科创风电设备有限公司 | Fault diagnosis method and device for filter circuit of converter and storage medium |
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