CN203606409U - Capacitor voltage transformer - Google Patents
Capacitor voltage transformer Download PDFInfo
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- CN203606409U CN203606409U CN201320831991.9U CN201320831991U CN203606409U CN 203606409 U CN203606409 U CN 203606409U CN 201320831991 U CN201320831991 U CN 201320831991U CN 203606409 U CN203606409 U CN 203606409U
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- voltage
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- transformer
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- electromagnetic unit
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- 239000003990 capacitor Substances 0.000 title claims abstract description 35
- 238000005259 measurement Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The utility model discloses a capacitor voltage transformer which comprises a capacitive voltage divider, an electromagnetic unit, a series capacitor and a current transformer. A high-voltage capacitor, a low-voltage capacitor and the series capacitor are connected in sequence to form a series circuit. A compensation reactor, an intermediate transformer and the current transformer are connected in sequence to form a series circuit. According to the utility model, the capacitor is serially connected in the low-voltage capacitance branch of the capacitive voltage divider of a normal capacitor voltage transformer, and the normal current transformer is serially connected in the electromagnetic unit branch. The measured voltage of the series capacitor and the measured current of the electromagnetic unit branch are utilized, and the high-voltage capacitance, the low-voltage capacitance and the series capacitance of the capacitive voltage divider are utilized in a combining manner, so that the harmonic wave content of a high-voltage system can be calculated, and necessary data support is provided for high-voltage system harmonic wave state analysis.
Description
Technical field
The utility model relates to a kind of capacitance type potential transformer, relates in particular to a kind ofly can measure the power frequency high-tension capacitance type potential transformer that simultaneously gathers high-precision high pressure harmonic measure.
Background technology
At present, the application of nonlinear-load in electric system is increasing, causes the voltage distortion problem of high-voltage electric power system more and more serious.Power supply department and scientific research institution measure in the urgent need to the voltage harmonic to high-voltage electric power system, to understand the voltage harmonic situation of high-pressure system, make harness of harmonic wave targetedly.
In existing high pressure harmonic measuring method and equipment, adopt the scheme of resistor dividing potential drop and capacitor dividing potential drop need to adopt special equipment, and these equipment volume are large, expensive.Capacitance type potential transformer is because of the advantage that its volume is little, lightweight, maintenance workload is few, electric field intensity nargin is large, insulating reliability is high; and dividing potential drop electric capacity can double as coupling condenser for radio frequency carrier channel, be widely used in even 35kV of 110kV() and voltage measurement, high frequency communication and the relay protection of above high voltage solidly earthed neutral system in.Thereby according to the actual fact, adopt capacitance type potential transformer to carry out the method that high pressure harmonic measure is most convenient economy.Conventional capacitance type potential transformer is mainly made up of capacitive divider and electromagnetic unit; Capacitive divider comprises high-voltage capacitance and the low-voltage capacitance of series connection, between high-voltage capacitance and low-voltage capacitance, is connected with electromagnetic unit, and electromagnetic unit is composed in series by compensation reactor and intermediate transformer, and the secondary side of intermediate transformer is connected with load.Because the internal resonance condition of conventional capacitance type potential transformer under harmonic condition is by destroyed, measure harmonic wave by occurring larger error, therefore cannot directly utilize conventional capacitance type potential transformer to carry out high pressure harmonic measure.
At present also there is the frequency response characteristic of having researched and analysed capacitance type potential transformer, after utilizing this frequency response characteristic to revise capacitance type potential transformer double measurement voltage, derive on high-tension side voltage harmonic.But this scheme needs the frequency response characteristic of the various dissimilar capacitance type potential transformers of off-line analysis, need to know detailed construction and the element parameter of capacitance type potential transformer, and the frequency response characteristic under different loading conditions is also different, therefore this method realizes comparatively complexity, has limited its application.
Therefore, if can capacitance type potential transformer simply be transformed, design the capacitance type potential transformer with high pressure harmonic measurement function, can power frequency is high-tension provides high-precision high pressure harmonic measure simultaneously measuring.Thereby provide for realizing high pressure harmonic voltage measurement the scheme that a kind of cost performance is very high, have great practical value and marketing prospect.
Utility model content
The purpose of this utility model is to provide a kind of capacitance type potential transformer, can power frequency is high-tension gather high-precision high pressure harmonic measure simultaneously measuring, provide necessary Data support for analyzing high-pressure system Harmonic Conditions.
The utility model adopts following technical proposals:
A kind of capacitance type potential transformer, comprises capacitive divider and electromagnetic unit; Capacitive divider comprises high-voltage capacitor and the secondary capacitor of series connection, between high-voltage capacitor and secondary capacitor, be connected with electromagnetic unit, electromagnetic unit is composed in series by compensation reactor and intermediate transformer, the secondary side of intermediate transformer is connected with load, also comprise and seal in capacitor summation current transformer, high-voltage capacitor, secondary capacitor and seal in capacitor and be in turn connected to form series circuit, compensation reactor, intermediate transformer summation current transformer are in turn connected to form series circuit.
Described current transformer seals in intermediate transformer
tthe position of the earth point of branch road.
The utility model seals in capacitor in the low-voltage capacitance branch road of the capacitive divider of conventional capacitance type potential transformer, in electromagnetic unit branch road, seal in conventional current mutual inductor, the voltage that what utilization measured seal on electric capacity and the electric current of electromagnetic unit branch road, in conjunction with high-tension electricity capacitance, the low tension capacitance of capacitive divider with seal in capacitance, can calculate the harmonic content of high-pressure system voltage.High voltage harmonic measure scheme based on capacitance type potential transformer of the present utility model only need simply be improved on the basis of conventional capacitance type potential transformer, realize simple, can power frequency is high-tension provides high-precision high pressure harmonic measure simultaneously measuring, provide necessary Data support for analyzing high-pressure system Harmonic Conditions, there is very high practical value and wide marketing application prospect.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present utility model.
Embodiment
As shown in Figure 1, the capacitance type potential transformer with high pressure harmonic measurement function described in the utility model comprises capacitive divider and electromagnetic unit; Capacitive divider comprises the high-voltage capacitor of series connection
c h and secondary capacitor
c l , high-voltage capacitor
c h and secondary capacitor
c l between be connected with electromagnetic unit, electromagnetic unit is by compensation reactor
l f and intermediate transformer
tbe composed in series intermediate transformer
tsecondary side be connected with load
z l , load
z l do not belong to the ingredient of capacitance type potential transformer.The utility model has also been set up and has been sealed in capacitor
c 3summation current transformer
s 1, high-voltage capacitor
c h , secondary capacitor
c l with seal in capacitor
c 3be in turn connected to form series circuit, compensation reactor
l f , intermediate transformer
tsummation current transformer
s 1be in turn connected to form series circuit.In order to reduce current transformer
s 1insulating requirements, current transformer
s 1seal in intermediate transformer
tthe earth point position of branch road.
In use, user can seal in electric capacity by measurement to the capacitance type potential transformer with high pressure harmonic measurement function described in the utility model
c 3on voltage and utilize current transformer
s 1measure the electric current of electromagnetic unit branch road, in conjunction with high-tension electricity capacitance, the low tension capacitance of capacitive divider with seal in capacitance, can calculate the harmonic content of high-pressure system voltage, provide necessary Data support for analyzing high-pressure system Harmonic Conditions, there is very high practical value and wide marketing application prospect.
Claims (2)
1. a capacitance type potential transformer, comprises capacitive divider and electromagnetic unit; Capacitive divider comprises high-voltage capacitor and the secondary capacitor of series connection, between high-voltage capacitor and secondary capacitor, be connected with electromagnetic unit, electromagnetic unit is composed in series by compensation reactor and intermediate transformer, the secondary side of intermediate transformer is connected with load, it is characterized in that: also comprise and seal in capacitor summation current transformer, high-voltage capacitor, secondary capacitor and seal in capacitor and be in turn connected to form series circuit, compensation reactor, intermediate transformer summation current transformer are in turn connected to form series circuit.
2. capacitance type potential transformer according to claim 1, is characterized in that: described current transformer seals in intermediate transformer
tthe position of the earth point of branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831991.9U CN203606409U (en) | 2013-12-17 | 2013-12-17 | Capacitor voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831991.9U CN203606409U (en) | 2013-12-17 | 2013-12-17 | Capacitor voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203606409U true CN203606409U (en) | 2014-05-21 |
Family
ID=50719074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320831991.9U Expired - Lifetime CN203606409U (en) | 2013-12-17 | 2013-12-17 | Capacitor voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203606409U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112698260A (en) * | 2020-11-24 | 2021-04-23 | 国网河北省电力有限公司电力科学研究院 | CVT voltage sag measurement error correction method and system |
| CN112730942A (en) * | 2020-12-21 | 2021-04-30 | 江苏华网融智科技有限公司 | Circuit for improving load capacity of voltage sensor and circuit element constant value method |
| CN115219975A (en) * | 2022-07-07 | 2022-10-21 | 中广核新能源安徽有限公司 | Device and method for measuring and correcting harmonic error of capacitor voltage transformer |
-
2013
- 2013-12-17 CN CN201320831991.9U patent/CN203606409U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112698260A (en) * | 2020-11-24 | 2021-04-23 | 国网河北省电力有限公司电力科学研究院 | CVT voltage sag measurement error correction method and system |
| CN112730942A (en) * | 2020-12-21 | 2021-04-30 | 江苏华网融智科技有限公司 | Circuit for improving load capacity of voltage sensor and circuit element constant value method |
| CN115219975A (en) * | 2022-07-07 | 2022-10-21 | 中广核新能源安徽有限公司 | Device and method for measuring and correcting harmonic error of capacitor voltage transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140521 |
|
| CX01 | Expiry of patent term |