CN105510667B - A kind of design method of multi-voltage grade capacitance type potential transformer - Google Patents
A kind of design method of multi-voltage grade capacitance type potential transformer Download PDFInfo
- Publication number
- CN105510667B CN105510667B CN201510969649.9A CN201510969649A CN105510667B CN 105510667 B CN105510667 B CN 105510667B CN 201510969649 A CN201510969649 A CN 201510969649A CN 105510667 B CN105510667 B CN 105510667B
- Authority
- CN
- China
- Prior art keywords
- voltage
- winding
- error
- transformer
- pressure transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Coils Of Transformers For General Uses (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of design method of multi-voltage grade capacitance type potential transformer, step (1) carries out capacitive divider, middle pressure transformer, compensation reactor design by highest voltage level；The number of turns of pressure transformer first winding chooses fixed value in step (2)；Pressure transformer secondary winding designs in step (3)；The secondary output design of step (4)；Method provided by the invention, the design of centering pressure transformer secondary winding, secondary output design give specific method, solve the design problem of pressure transformer in multi-voltage grade use, capacitance type potential transformer is made to meet the requirement of parameters under multi-voltage grade.
Description
Technical field
The present invention relates to high-tension electricity fields of measurement, in particular to a kind of multi-voltage grade capacitance type potential transformer
Design method.
Background technique
The main application of capacitance type potential transformer (hereinafter referred to as CVT) in the power system is for electrical energy measurement and electricity
It presses measurement, relay protection and also serves as coupling capacitor and carry out carrier communication.Existing capacitance type potential transformer equipment is only applicable in
In a kind of system of voltage.Example: rated primary voltage is that the product of 220/ √ 3kV is only used for 220kV electric system, Bu Nengshi
With the electric system of other different voltages grades, using with limitation.Pressure transformer is secondary in capacitance type potential transformer
Intermediate terminal is extracted in winding, is made to meet a kind of voltage class requirement between the secondary winding every two terminal, can be made condenser type
Voltage transformer can use in the electric system of multiple voltage grade, but pressure transformer is secondary in how being accurately arranged
Winding intermediate terminal, determine in pressure transformer the number of turns, so that capacitance type potential transformer is met parameters under multi-voltage grade
It is required that becoming current urgent problem.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of multi-voltage grade capacitor voltage is mutual
The design method of sensor makes a kind of capacitance type potential transformer product that can be suitable for two or more voltages simultaneously by this method
In the electric system of grade.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of design method of multi-voltage grade capacitance type potential transformer, comprising the following steps:
Step (1) is carried out capacitive divider, middle pressure transformer, compensation reactor design by highest voltage level；
Step (2), the number of turns of middle pressure transformer first winding choose fixed value；
Step (3), the design of middle pressure transformer secondary winding；
The turn ratio error of secondary winding is first determined according to two voltage class, setting two systems voltage is respectively UA1、
UA2If UA1For high voltage grade, in voltage UA1Under, piezoelectricity pressure is U in capacitive dividerT1, then in voltage UA2Under, middle piezoelectricity
Press UT2Are as follows:
UT2=UA2×UT1/UA1
In voltage UA1Lower secondary winding the number of turns W21, when fixing the number of turns of first winding, then in voltage UA2Under, secondary winding
The number of turns W22Are as follows:
W22=W21×UA1/UA2
W22/W21=UA1/UA2
Work as UA1It is not UA2When integral multiple, by UA1/UA2Abbreviation is fraction in lowest term, middle pressure transformer secondary winding the number of turns difference
The integral multiple of corresponding corresponding molecule and denominator, then secondary winding the number of turns is selected by corresponding circle potential requirements range；
Step (4), secondary output design
Error check is carried out by lower voltage grade when output secondary to capacitance type potential transformer designs；Make middle buckling pressure
The device flux density that works within the scope of normal working voltage is maintained at linear operating region.
Further, in the step (1) when capacitive divider, middle pressure transformer, compensation reactor design, first according to capacitor
Formula voltage transformer secondary rated output first selectes the capacitor of capacitive divider, estimates middle pressure voltage value, pressure transformer in progress
Design, compensation reactor is designed according to the capacitive reactance of capacitive divider and the leakage reactance of middle pressure transformer, followed by error
It calculates and checks；Multiple groups, which are equipped with, in middle pressure transformer first winding side and compensation reactor adjusts winding, it is mutual for capacitor voltage
The regulating error of sensor.
Further, the design of pressure transformer is in progress, and first winding, secondary winding the number of turns of middle pressure transformer are pressed following
Mode calculates determination:
The work circle potential e of pressure transformer winding in selection first determines secondary winding the number of turns W2:
W2=U2/e
Wherein U2For the voltage rating of secondary winding, W2It is rounded by above-mentioned calculated result；
First winding the number of turns W1Are as follows:
W1=UT/U2
Wherein UTFor the medium voltage of capacitive divider, W1It is rounded by above formula calculated result.
Further, it includes that no-load error and load error calculate that error calculation, which is checked,；
No-load error be by middle pressure transformer core loss and primary circuit winding loss bring error, no-load error
Voltage error f0With phase error δ0It is calculated as follows:
In formula: I0For middle pressure transformer exciting current, θ0For core loss angle, I0·sinθ0For active component；I0·cos
θ0For reactive component；
X1For primary circuit residue reactance, X1=XL1-XC；
R1For primary circuit resistance, D.C. resistance including compensation reactor winding and middle pressure transformer first winding and
The substitutional resistance of capacitive divider；
Load error is by secondary load bring error, the voltage error f of load errornWith phase error δnAs the following formula
It calculates:
In formula: S2For secondary load,For secondary load power-factor angle；
Circuit equivalent total resistance, R=R when R is load operation1+R2′；
Circuit residue reactance when X is load operation, X=XL1+XL2′-XC。
R2' it is secondary winding short circuit D.C. resistance of the conversion to primary side
XL1For primary circuit leakage reactance, the reactance including middle pressure transformer first winding leakage reactance and compensation reactor
XL2' it is the secondary winding leakage reactance that primary side is arrived in conversion
XCFor the capacitive reactance of equivalent capacitance.
The design method of voltage class capacitance type potential transformer provided by the invention, centering pressure transformer secondary winding
Design, secondary output design give specific method, solve the design problem of pressure transformer in multi-voltage grade use, make electricity
Appearance formula voltage transformer meets the requirement of parameters under multi-voltage grade.The design method provided according to the present invention can design
A kind of capacitance type potential transformer product suitable for multiple voltage system out.It solves an original product and is only used for one kind
The status of electrical voltage system only uses the load requirement that a product is just able to satisfy in the electric system of different voltages grade now,
The deficiencies in the prior art are overcome, it is flexible in application, it can not only save use cost, but also the practicability of enhancing product.
Detailed description of the invention
Fig. 1 (a) is existing capacitance type potential transformer schematic diagram；The equivalent electricity of the existing capacitance type potential transformer of Fig. 1 (b)
Lu Tu
Fig. 2 is the schematic diagram of pressure transformer secondary winding in capacitance type potential transformer provided by the invention
Fig. 3 is to be applicable in two voltage class electrical voltage system capacitance type potential transformer electrical schematic diagrams
In figure: U1Primary voltage；UTMedium voltage；C1High-voltage capacitance；C2Middle voltage capacitance；Pressure transformer in T-；L- is mended
Repay reactor；L1Primary circuit inductance (including compensation reactor inductance and middle pressure transformer first winding leakage inductance)；R1It is primary
Loop resistance (the equivalence of D.C. resistance and capacitive divider including compensation reactor winding and middle pressure transformer first winding
Resistance)；R2The secondary winding short circuit D.C. resistance of '-conversion to primary side；L'2It converts to the secondary winding short circuit of primary side and leaks
Reactance；Z2Secondary load impedance；I1Primary circuit electric current；I'2The secondary loop current of primary side is arrived in conversion；Z0Middle buckling
Depressor excitation impedance；Z'2The secondary load impedance of primary side is arrived in conversion；U'2Primary side secondary voltage is arrived in conversion.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawing, but the present invention is not limited to these Examples.
Its principle of CVT is that primary side high pressure is converted to middle piezoelectricity pressure, middle buckling by capacitance partial pressure by capacitive divider
Middle piezoelectricity pressure is reconverted into defined secondary low-voltage by depressor.
CVT is mainly made of components such as capacitive divider, middle pressure transformer, compensation reactors.Capacitive divider includes height
Voltage capacitance C1With middle voltage capacitance C2, high-voltage capacitance C1With middle voltage capacitance C2Junction connection in pressure transformer T, compensation reactor L
It is connected in series with middle pressure transformer T, can be at the high-pressure side of middle pressure transformer T, can also be in the low pressure of middle pressure transformer T
Side.Compensation reactor is used for the capacitive reactance of compensating electric capacity divider.Shown in CVT schematic circuit such as Fig. 1 (a).
The design of CVT, which is based primarily upon, carries out analysis meter through the transformed equivalent circuit diagram of Dai Weinan equivalent generator principle
It calculates, as shown in Fig. 1 (b).In CVT design, usually make the induction reactance in circuit and capacitive reactance roughly equal, it may be assumed that Xc ≈ XL1+X’L2, make
Middle pressure U of the voltage at middle pressure transformer both ends closer to capacitive dividerT, since D.C. resistance can not be eliminated in circuit, examine
Consider its influence to phase error, general induction reactance is slightly larger than capacitive reactance.
CVT Product Desing Flow is mainly the capacitor that capacitive divider is first selected according to secondary rated output, estimates middle pressure
Voltage value, the design of pressure transformer in progress, compensation reactor is then according to the leakage of the capacitive reactance of capacitive divider and middle pressure transformer
Anti- to be designed, followed by error calculation is checked.Multiple groups tune is equipped in middle pressure transformer first winding side and compensation reactor
Save winding, the regulating error for CVT.
First winding, secondary winding the number of turns of middle pressure transformer calculate determination in the following manner:
The work circle potential e of pressure transformer winding in selection first determines secondary winding the number of turns W2:
W2=U2/e
Wherein U2For the voltage rating of secondary winding, China's standard regulation secondary voltage is generally 100/ √ 3V or 100V.
Since the number of turns is integer, W2It is rounded by above-mentioned calculated result.
First winding the number of turns W1Are as follows:
W1=UT/U2
W1It is rounded by above formula calculated result.
The error calculation of CVT mainly has no-load error and load error to calculate, due to system frequency variation and environment temperature
Variation can bring additive error to CVT error, therefore need to there are certain nargin in design.
No-load error be by middle pressure transformer core loss and primary circuit winding loss bring error, no-load error
Voltage error f0With phase error δ0It is calculated as follows:
In formula: I0For middle pressure transformer exciting current, I0·sinθ0For active component；I0·cosθ0For reactive component；
X1For primary circuit residue reactance, X1=XL1-XC；
Load error is by secondary load bring error, the voltage error f of load errornWith phase error δnAs the following formula
It calculates:
In formula: S2For secondary load,For secondary load power-factor angle
Circuit equivalent total resistance, R=R when R is load operation1+R2′；
Circuit residue reactance when X is load operation, X=XL1+XL2′-XC；
The design of above-mentioned CVT is generally only applicable to a kind of voltage class product, if wanting to be suitable for a product can simultaneously
When in the electric system of two or more voltage class, then needs to solve the secondary winding under different voltages grade while meeting rule
The requirement of constant voltage.
Design method provided by the invention is as follows:
1, capacitive divider, middle pressure transformer, compensation reactor are designed by highest voltage level.
2, the number of turns of middle pressure transformer first winding chooses fixed value.
3, secondary winding is designed by following methods:
Since umber of turn is integer, the turn ratio error of secondary winding is first determined according to two voltage class.
Setting two systems voltage is respectively UA1、UA2If UA1For high voltage grade.In voltage UA1Under, capacitive divider
Middle piezoelectricity pressure is UT1, then in voltage UA2Under, middle piezoelectricity presses UT2Are as follows:
UT2=UA2×UT1/UA1
In voltage UA1Lower secondary winding the number of turns W21, when fixing the number of turns of first winding, then in voltage UA2Under, secondary winding
The number of turns W22Are as follows:
W22=W21×UA1/UA2
W22/W21=UA1/UA2
Work as UA1It is not UA2When integral multiple, by UA1/UA2Abbreviation is fraction in lowest term, and secondary winding the number of turns respectively corresponds corresponding point
The integral multiple of son or denominator, then the number of turns is selected by corresponding circle potential requirements range.Such as press primary voltage 220/ √ 3kV and 132/
When two kinds of voltage class designs of √ 3kV, secondary winding turn ratio are as follows:
W22/W21=(220/ √ 3)/(132/ √ 3)=5/3
By secondary 100/ √ 3V of voltage rating, when circle potential e takes 1.2 or so, then W21Choose 48 circles, W22Choose 80 circles；If
When circle potential e takes 1.5 or so, then W21Choose 39 circles, W22Choose 65 circles.
Secondary winding uses tap form, as shown in Fig. 2, being wherein used for high voltage grade UA1When, corresponding secondary terminals
Son is a2-n, the number of turns W21；For lower voltage grade UA2When, corresponding secondary terminals are a1-n, the number of turns W22。
4, the design of secondary output
Due to capacitive divider intrinsic standoff ratio be it is fixed, to high voltage grade in use, middle piezoelectricity pressure is higher, to lower
Voltage class is in use, middle piezoelectricity pressure is lower.Such as above-mentioned formula (1), (2), in the linear working range of middle pressure transformer, two
No-load error under kind voltage class is almost the same.By formula (3), (4), load error and middle piezoelectricity pressure square are inversely proportional,
To high voltage grade in use, middle piezoelectricity pressure is high, error is small, and to lower voltage grade in use, middle piezoelectricity forces down, error
Greatly.It may also be said that apply in identical accuracy requirement in high voltage hierarchical system, secondary output is larger, apply compared with
When low-voltage-grade system, secondary output is smaller.
Therefore, error check should be carried out by lower voltage grade when designing secondary output.
The selection of pressure transformer work flux density in 1.
To guarantee that under two kinds of voltage class CVT is able to satisfy the requirement of accuracy, it should be made in normal working voltage model
It encloses interior work flux density and is maintained at linear operating region.
2. other designs are identical as general CVT design.
According to above-mentioned provided design method, a kind of CVT for being applicable in two voltage class electrical voltage systems can be designed.Its
Electrical schematic diagram such as Fig. 3.When for high voltage grade, corresponding secondary terminals are a2-n；It is right when for lower voltage grade
The secondary terminals answered are a1-n.Similarly, secondary winding can be designed as two or more windings.
Claims (2)
1. a kind of design method of multi-voltage grade capacitance type potential transformer, it is characterised in that the following steps are included:
Step (1) is carried out capacitive divider, middle pressure transformer, compensation reactor design by highest voltage level；The step
(1) first secondary specified defeated according to capacitance type potential transformer in when capacitive divider, middle pressure transformer, compensation reactor design
The capacitor for first selecting capacitive divider out, estimates middle pressure voltage value, the design of pressure transformer in progress, compensation reactor is according to electricity
The leakage reactance of the capacitive reactance and middle pressure transformer of holding divider is designed, and followed by error calculation is checked；In middle pressure transformer one
Secondary winding side and compensation reactor are equipped with multiple groups and adjust winding, the regulating error for capacitance type potential transformer；
Step (2), the number of turns of middle pressure transformer first winding choose fixed value；Specific calculating process is: first winding the number of turns W1
Are as follows: W1=UT/U2；Wherein UTFor the medium voltage of capacitive divider, W1It is rounded by above formula calculated result；
Step (3), the design of middle pressure transformer secondary winding；Specific calculating process is: the work circle of pressure transformer winding in selection
Potential e determines secondary winding the number of turns W2: W2=U2/e；Wherein U2For the voltage rating of secondary winding, W2It is taken by above-mentioned calculated result
It is whole；
The turn ratio error of secondary winding is first determined according to two voltage class, setting two systems voltage is respectively UA1、UA2If
UA1For high voltage grade, in voltage UA1Under, piezoelectricity pressure is U in capacitive dividerT1, then in voltage UA2Under, middle piezoelectricity presses UT2
Are as follows:
UT2=UA2×UT1/UA1
In voltage UA1Lower secondary winding the number of turns W21, when fixing the number of turns of first winding, then in voltage UA2Under, secondary winding the number of turns
W22Are as follows:
W22=W21×UA1/UA2
W22/W21=UA1/UA2
Work as UA1It is not UA2When integral multiple, by UA1/UA2Abbreviation is fraction in lowest term, and middle pressure transformer secondary winding the number of turns respectively corresponds
The integral multiple of corresponding molecule and denominator, then secondary winding the number of turns is selected by corresponding circle potential requirements range；
Step (4), secondary output design
Error check is carried out by lower voltage grade when output secondary to capacitance type potential transformer designs；Middle pressure transformer is set to exist
The flux density that works within the scope of normal working voltage is maintained at linear operating region.
2. the design method of multi-voltage grade capacitance type potential transformer according to claim 1, it is characterised in that: accidentally
It includes that no-load error and load error calculate that difference, which is calculated and checked,；
No-load error is by middle pressure transformer core loss and primary circuit winding loss bring error, the voltage of no-load error
Error f0With phase error δ0It is calculated as follows:
In formula: I0For middle pressure transformer exciting current, θ0For core loss angle, I0·sinθ0For active component；I0·cosθ0For
Reactive component；
X1For primary circuit residue reactance, X1=XL1-XC；
R1For primary circuit resistance, D.C. resistance and capacitor including compensation reactor winding and middle pressure transformer first winding
The substitutional resistance of divider；
Load error is by secondary load bring error, the voltage error f of load errornWith phase error δnIt is calculated as follows:
In formula: S2For secondary load,For secondary load power-factor angle；
Circuit equivalent total resistance, R=R when R is load operation1+R2′；
Circuit residue reactance when X is load operation, X=XL1+XL2′-XC；
R2' it is secondary winding short circuit D.C. resistance of the conversion to primary side；
XL1For primary circuit leakage reactance, the reactance including middle pressure transformer first winding leakage reactance and compensation reactor；
XL2' it is the secondary winding leakage reactance that primary side is arrived in conversion；
XCFor the capacitive reactance of equivalent capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510969649.9A CN105510667B (en) | 2015-12-21 | 2015-12-21 | A kind of design method of multi-voltage grade capacitance type potential transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510969649.9A CN105510667B (en) | 2015-12-21 | 2015-12-21 | A kind of design method of multi-voltage grade capacitance type potential transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105510667A CN105510667A (en) | 2016-04-20 |
| CN105510667B true CN105510667B (en) | 2019-02-01 |
Family
ID=55718791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510969649.9A Active CN105510667B (en) | 2015-12-21 | 2015-12-21 | A kind of design method of multi-voltage grade capacitance type potential transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105510667B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253777B (en) * | 2016-08-15 | 2018-08-17 | 中国西电电气股份有限公司 | The method for improving the secondary output capacity of capacitance type potential transformer |
| CN106841860A (en) * | 2017-01-09 | 2017-06-13 | 中国电力科学研究院 | The CVT dynamic analog devices and its parameter acquiring method of a kind of use for laboratory |
| CN110082698A (en) * | 2019-04-16 | 2019-08-02 | 贵州电网有限责任公司 | A kind of capacitance type potential transformer integrated operation status assessment analogue system |
| CN110927649A (en) * | 2019-12-02 | 2020-03-27 | 云南电网有限责任公司玉溪供电局 | Voltage transformer modularization calibrating installation |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201282017Y (en) * | 2008-08-21 | 2009-07-29 | 中国西电电气股份有限公司 | Capacitor voltage transformer capable of regulating error on site |
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| CN103675445A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Capacitive voltage mutual inductor with high-voltage harmonic measurement function and measurement method |
| CN204241684U (en) * | 2014-12-18 | 2015-04-01 | 武汉大学 | Capacitance type potential transformer error checking arrangement |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7567881B2 (en) * | 2007-03-30 | 2009-07-28 | General Electric Company | Self-adjusting voltage filtering technique compensating for dynamic errors of capacitive voltage transformers |
| CN103310963B (en) * | 2013-03-26 | 2015-12-09 | 国家电网公司 | A kind of three-winding transformer method for designing being applicable to 35kV distributionization and building |
-
2015
- 2015-12-21 CN CN201510969649.9A patent/CN105510667B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201282017Y (en) * | 2008-08-21 | 2009-07-29 | 中国西电电气股份有限公司 | Capacitor voltage transformer capable of regulating error on site |
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| CN103675445A (en) * | 2013-12-17 | 2014-03-26 | 国家电网公司 | Capacitive voltage mutual inductor with high-voltage harmonic measurement function and measurement method |
| CN204241684U (en) * | 2014-12-18 | 2015-04-01 | 武汉大学 | Capacitance type potential transformer error checking arrangement |
Non-Patent Citations (1)
| Title |
|---|
| 电容式电压互感器误差特性的研究;王德忠 等;《高压电器》;20010131;第37卷(第1期);第5页-第9页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105510667A (en) | 2016-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Huang et al. | An inductive-power-transfer converter with high efficiency throughout battery-charging process | |
| CN105510667B (en) | A kind of design method of multi-voltage grade capacitance type potential transformer | |
| CN201319064Y (en) | Test circuit for field accuracy detection of high-voltage current transformer | |
| CN104198900A (en) | Testing device for long term voltage induction and partial discharge measurement test | |
| CN102508190A (en) | Method for testing error influence quantity to high-voltage three-phase current transformer from high-voltage leakage current | |
| CN101753037A (en) | High voltage generation device of medical high-frequency high voltage generator | |
| CN109521339B (en) | Power frequency parallel resonance voltage withstand test method based on non-full compensation | |
| CN103336188A (en) | Current boosting apparatus suitable for GIS equipment | |
| CN105911501A (en) | 220kV voltage transformer intelligence error verification system | |
| TWM497385U (en) | Active balancing module for a series battery | |
| CN204832484U (en) | Intelligent substation compensation formula rises and flows device | |
| CN107315119A (en) | A kind of extreme high voltage converter transformer valve group is taken out stitches and test method | |
| CN109212293B (en) | Power supply type voltage transformer with voltage metering function and use method | |
| CN102944775B (en) | Characteristic test system for high-capacity transformer based on high-voltage variable-frequency power supply | |
| US9906027B2 (en) | Transferring electrical power for subsea applications | |
| CN106981995A (en) | The minute design method of high frequency transformer voltage, current transfer ratio | |
| CN202330691U (en) | Field calibrating equipment for voltage transformer | |
| CN102368433A (en) | Multi-range standard voltage transformator | |
| CN202189670U (en) | Combined current converter | |
| CN202034226U (en) | Multi-range standard voltage transformer | |
| CN107170571A (en) | A kind of multilevel voltage transformer | |
| CN204256110U (en) | The proving installation measuring test is put for induced voltage drawn game time long | |
| Nam et al. | Optimal design method for series LCLC resonant converter based on analytical solutions for voltage gain resonant peaks | |
| CN109375047B (en) | System and method for testing double-end asynchronous polarity of high-voltage transmission line | |
| CN203536206U (en) | Adjustable loaded passive zero-flux single-turn core-through current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |