CN201364821Y - Capacitor device - Google Patents
Capacitor device Download PDFInfo
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- CN201364821Y CN201364821Y CNU200920006037XU CN200920006037U CN201364821Y CN 201364821 Y CN201364821 Y CN 201364821Y CN U200920006037X U CNU200920006037X U CN U200920006037XU CN 200920006037 U CN200920006037 U CN 200920006037U CN 201364821 Y CN201364821 Y CN 201364821Y
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- Prior art keywords
- capacitor
- phase
- separate unit
- wire
- power system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model provides a capacitor device which can be used to check capacitor abnormity electrically through simple composition and in particular provides a capacitor device which has prominent effect when a plurality of capacitors are used singly. R, S and T three phase power supply systems are connected with at least two capacitors in parallel, convertors CT are distributed and installed on each different phase of single SCA and SCB, secondary windings of each convertor CT are connected in parallel, and current summation of each convertor CT is checked through a current relay 1.
Description
Technical field
The utility model relates to the power capacitor device of power-factor improvement etc.
Background technology
Capacitor abnormality detection mode in the power capacitor equipment of power-factor improvement etc. roughly has mechanical detection mode and electrical mode.The mechanical detection mode has the mode that detects the carton and crate expansion of accommodating capacitor, the mode of detection internal pressure etc.In addition, the electrical mode has detection mode, overcurrent detection mode etc. between open triangle mode, differential voltage detection mode, neutral point voltage detection mode, 2 heavy neutral points.
Fig. 3 to Fig. 5 is the figure that the summary of example of the abnormal detector of the expression capacitor that uses the electrical mode constitutes.Fig. 3 is the overvoltage detection mode of expression by the three-phase form, and Fig. 4 is the overvoltage detection mode of expression by single-phase form, and Fig. 5 is the overcurrent detection mode of expression by uneven form.In addition, the example of representing among each figure is the example about the capacitor separate unit, below example that each figure is represented simply describe.
Among each figure, C, C1, C2 represent the aggregate (to call " capacitor " in the following text) of capacitor.As shown in Figure 3, capacitor C inserts R phase, S phase, the T phase of phase three-wire three formula electric power system respectively, and the end of each capacitor C interconnects (neutral point).The two ends of each capacitor C connect discharge winding DC, and the secondary winding of each winding DC that discharges is connected in overvoltage relay.Be short-circuited in the inside of any capacitor C this moment, and overvoltage then takes place, and its voltage detects with overvoltage relay.
As shown in Figure 4, insert R phase, the S phase of phase three-wire three formula electric power system, the capacitor C1 and the C2 of T phase respectively, wait the each several part that capacity is cut apart to illustrate respectively on capacitor C polyphone ground shown in Figure 3, the two ends of each capacitor C1 and C2 are connected the winding DC that discharges respectively, and each is gone up the secondary winding polarity inversion polyphone connection of discharge winding DC mutually and is connected in overvoltage relay.At this moment, the inside one of any of capacitor C1 and C2 is short-circuited, and overvoltage then takes place, and its voltage is detected with the overvoltage relay.
As shown in Figure 5, insert R phase, the S phase of phase three-wire three formula electric power system, the capacitor CI and the C2 of T phase respectively, wait the each several part that capacity is cut apart to illustrate respectively on capacitor C polyphone ground shown in Figure 3, insert current transformer CT on the connecting line that the mutual tie point (neutral point) of the interlinkage (neutral point) of the capacitor C1 of each phase and the capacitor C2 of each phase is connected and connect overcurrent relay.At this moment, when the inside of the capacitor C1 of each phase and any of C2 is short-circuited, then flow through unsymmetrical current between neutral point, its electric current is detected with overcurrent relay.
The utility model content
The technical problem that solves
In the mechanical capacitor, the dielectric of capacitor has become since the full film formation, and the rising of internal pressure diminishes.For this reason, there is the low problem of sensitivity that detects in the abnormality detection mode of existing capacitor.In addition, the capacitor of electrical mode can improve sensitivity, but under the situation about particularly a plurality of capacitor separate units being connected side by side, the problem below existing.That is, open triangle or differential voltage mode, the terminal voltage that need connect the capacitor of phase three-wire three formula electric power system detects the voltage transformer of usefulness, and need draw the neutral point of the capacitor that connects the electric power system of phase three-wire three formula, sleeve pipes etc. are more, complex structure, cost up.
2 heavy neutral detection modes are drawn neutral terminal on each of the capacitor that connects in the phase three-wire three formula electric power system that needs to connect side by side, and same sleeve pipe etc. are more, and complex structure can not be suitable for the commercially available prod, and cost increases.
The overcurrent detection mode, the linking number arranged side by side of capacitor separate unit is many more, and the overcurrent multiple during fault just diminishes, and has the not high problem of sensitivity that detects.
Technical scheme
The abnormal detector of capacitor of the present utility model has, possess the capacitor that connects each phase of phase three-wire three formula electric power system the capacitor separate unit, be installed in capacitor with each alternate current transformer of phase three-wire three formula electric power system, be connected the overcurrent relay that current transformer is imported its output side by side.
And when constituting in the electric power system of phase three-wire three formula a plurality of connection arranged side by side of capacitor separate unit, the current transformer of three-phase part is distributed to the capacitor separate unit of connection arranged side by side respectively.
By above-mentioned feature of the present utility model, all capacitors are just often flowing through the electric current of each current transformer, and because of same value has 120 ° phase difference respectively, the composite value of the secondary side of current transformer is zero A (ampere).When breaking down on the capacitor of any capacitor separate unit, then three alternate unsymmetrical currents flow through the capacitor separate unit of fault.Each phase aggregate value of the electric current that the capacitor separate unit of fault flows through is zero A (ampere), but the non-vanishing A of the aggregate value between the different capacitors separate unit (ampere) is in overcurrent relay upper reaches overcurrent.Relay can detect fault by the detection of stablizing this electric current.
In addition, for example, current transformer, the capacitor separate unit is at 2 when arranged side by side, and the R that the capacitor of a capacitor separate unit is distributed in the three-phase goes up mutually with S mutually, the capacitor that remains 1 capacitor separate unit is distributed to T install mutually.In addition, for example, when 3 of capacitor separate units were arranged side by side, current transformer was distributed into R phase, S phase, T and installs mutually on each capacitor separate unit.All to be current transformer constitute numbers with 3 gets final product less, and each that is installed in capacitor and the electric power system of phase three-wire three formula is alternate.
Beneficial effect
The arranged side by side structure that current transformer is not installed on the homophase separately of the input part of the capacitor separate unit that connects, the sleeve pipe number of capacitor separate unit can be tailed off, make the time simple in structure, but detect by minimal current transformer high sensitivity ground unusual, the capacitor device that can obtain to reduce cost.
Description of drawings
Fig. 1 is the circuit description figure when the electric power system of phase three-wire three formula connects 2 of capacitor separate units side by side in the capacitor abnormal detector of capacitor equipment of the present utility model.
Fig. 2 is the circuit description figure when the electric power system of phase three-wire three formula connects 3 of capacitor separate units side by side in the capacitor abnormal detector of capacitor equipment of the present utility model.
Fig. 3 is the pie graph of an example of capacitor abnormal detector in the capacitor equipment.
Fig. 4 is the pie graph of an example of capacitor abnormal detector in the capacitor equipment.
Fig. 5 is the pie graph of an example of capacitor abnormal detector in the capacitor equipment.
Embodiment
With regard to the example of capacitor abnormal detector in the capacitor equipment of the present utility model, seeing figures.1.and.2 describes.Fig. 1 is the circuit description figure of the capacitor abnormal detector of the R phase, S phase, T of phase three-wire three formula electric power system when 2 of capacitor separate units (the capacitor group who accommodates in 1 capacitor box) being connected side by side in mutually.Fig. 2 is the circuit description figure of the capacitor abnormal detector of the R phase, S phase, T of phase three-wire three formula electric power system when 3 of capacitor separate units being connected side by side in mutually.
Capacitor abnormal detector when (1) the R phase of phase three-wire three formula electric power system, S phase, T connect 2 of capacitor separate units in mutually side by side, as shown in Figure 1, a capacitor separate unit SCA goes up with S mutually mutually at R, the capacitor separate unit SCB that remains 1 installs current transformer CT mutually at T, and the secondary winding of each current transformer CT (once being the incoming line of capacitor separate unit) is connected in overcurrent relay 1 side by side and constitutes.At this moment, current transformer CT is 3 of three-phase part, is distributed in different going up mutually respectively on capacitor separate unit SCA and the capacitor separate unit SCB and installs.
The abnormal detector of the capacitor of Gou Chenging like this, just often, the electric current that flows through each current transformer CT has 120 ° phase difference respectively in same value, so the composite value of the secondary side of current transformer CT is zero A (ampere).When breaking down on capacitor C1, the C2 of any capacitor separate unit SCA, SCB, for example, connect when (the capacitor C1 that the arrow of Fig. 1 is represented) fault such as being short-circuited on the part of capacitor inside of R phase of capacitor separate unit SCA, then flow through capacitor separate unit SCA at three alternate unsymmetrical currents.
The aggregate value of each phase of the electric current that flows through on the capacitor separate unit SCA that breaks down at this moment, is zero A (ampere).But, the non-vanishing A of aggregate value (ampere) between capacitor separate unit SCB, overcurrent relay 1 upper reaches overcurrent can detect fault.
Below with regard to each electric current that flows through on mutually of capacitor separate unit SCA, SCB and just often, the electric current during fault, use formula to describe.In addition, I and V are vector in the formula, omit in formula.In addition, A and B represent capacitor separate unit SCA, SCB respectively.R, S, T represent R phase, S phase, the T phase of phase three-wire three formula electric power system respectively.
Each phase current of capacitor separate unit SCA:
IRA＝{1-(YRA+a
2YSA+aYTA)/(YRA+YSA+YTA)}VRYRA
ISA＝{a
2-(YRA+a
2YSA+aYTA)/(YRA+YSA+YTA)}VRYSA
ITA＝{a-(YRA+a
2YSA+aYTA)/(YRA+YSA+YTA)}VRYTA
Each phase current of capacitor separate unit SCB:
IRB＝{1-(YRB+a
2YSB+aYTB)/(YRB+YSB+YTB)}VRYRB
ISB＝{a
2-(YRB+a
2YSB+aYTB)/(YRB+YSB+YTB)}VRYSB
ITB＝{a-(YRB+a
2YSB+aYTB)/(YRB+YSB+YTB)}VRYTB
But,
VR=aVS=a
2VT (phase voltage)
The three-phase aggregate value of capacitor separate unit SCA only:
IAT＝IRA+ISA+ITA＝0
On the one hand, the input current of overcurrent relay 1 be capacitor separate unit SCA R phase, S mutually and the T aggregate value mutually of capacitor separate unit SCB, so, flow through the electric current I T of overcurrent relay 1:
IT=IRA+ISA+ITB=-ITA+ITB (but, IRA+ISA=-ITA)
Just often, absolute value IRA=absolute value IRB=absolute value ISA=absolute value ISB=absolute value ITA=absolute value ITB, so, IT=0.
During fault, as shown in Figure 1, the capacitor C1 of capacitor separate unit SCA is following when being short-circuited fault.
YRA＝2、0(p.u)YSA＝YTA＝1、0(p.u)
YRB＝YSB＝YTB＝1、0(p.u)、VR＝1、0(p.u)
That is IT=-ITA+ITB=0,25 (p.u),
The rated current of capacitor separate unit SCA is 1,0 (p.u), so the adjusted value of relay is for the redundancy of the rated current 25% of one of them capacitor separate unit SCB, get one and get final product, like this, compare with the total electric current of measuring two capacitor separate units and to have higher sensitivity than low value.
(2) the R phase of phase three-wire three formula electric power system, S phase, T go up the abnormal detector with the capacitor of capacitor separate unit during 3 arranged side by side connections mutually, as shown in Figure 2, the 1st capacitor separate unit SCA is in the R phase, the 2nd capacitor separate unit SCB is in the S phase, the 3rd capacitor separate unit SCC installs current transformer CT mutually at T, and the secondary winding of each current transformer CT connects overcurrent relay 1 side by side and constitutes.At this moment, current transformer CT is 3 of three-phase part, and capacitor separate unit SCA distributes respectively with capacitor separate unit SCC with capacitor separate unit SCB and is installed on different phases.
The abnormal detector of the capacitor of Gou Chenging like this, the capacitor C1 of same any capacitor separate unit SCA, SCB, SCC during with aforesaid 2, when also having C2 to break down, for example, be short-circuited on the part of the inside of the capacitor that the R of capacitor separate unit SCA go up to connect mutually when waiting (the capacitor C1 that the arrow of Fig. 2 is represented) fault, the aggregate value of each phase of the electric current that flows through on the capacitor separate unit SCA of fault is zero A (ampere).But, and the aggregate value between other capacitor separate unit is non-vanishing, at overcurrent relay 1 upper reaches overcurrent, detectable failure.
Below same during with above-mentioned 2, with regard to each electric current that flows through on mutually of capacitor separate unit SCA, SCB, SCC and just often, the electric current during fault uses formula to describe.
In addition, C represents capacitor separate unit SCC in the formula, and other marks are same as described above.Each phase current of capacitor separate unit SCA:
IRA＝{1-(YRA+a
2YSA+aYTA)/(YRA+YSA+YTA)}VRYRA
ISA＝{a
2-(YRA+a
2YSA+aYTA)/(YRA+YSA+YTA)}VRYSA
ITA＝{a-(YRA+a
2YSA+aYTA)/(YRA+YSA+YTA)}VRYTA
Each phase current of capacitor separate unit SCB:
IRB＝{1-(YRB+a
2YSB+aYTB)/(YRB+YSB+YTB)}VRYRB
ISB＝{a
2-(YRB+a
2YSB+aYTB)/(YRB+YSB+YTB)}VRYSB
ITB＝{a-(YRB+a
2YSB+aYTB)/(YRB+YSB+YTB)}VRYTB
Each phase current of capacitor separate unit SCC:
IRC＝{1-(YRC+a
2YSC+aYTC)/(YRC+YSC+YTC)}VRYRC
ISC＝{a
2-(YRC+a
2YSC+aYTC)/(YRC+YSC+YTC)}VRYSC
ITC＝{a-(YRC+a
2YSC+aYTC)/(YRC+YSC+YTC)}VRYTC
The input current of overcurrent relay 1 be capacitor separate unit SCA R mutually and the S of capacitor separate unit SCB mutually with the T aggregate value mutually of capacitor separate unit SCC, so, flow through the electric current I T of overcurrent relay 1:
IT＝IRA+ISB+ITC
Just often, set up electric current I T=0 because of following formula.
Absolute value IRA=absolute value IRB=absolute value IRC=absolute value ISA=absolute value ISB=absolute value ISC=absolute value ITA=absolute value ITB=absolute value ITC
During fault, as shown in Figure 2, the capacitor C1 of capacitor separate unit SCA is following when being short-circuited fault.
YRA＝2、0(p.u)
YRB＝YSB＝YTB＝YSA＝YTA＝YRC＝YSC＝YTC＝1、0(p.u)
VR＝1、0(p.u)
IRA＝1、5(p.u)
The electric current I T that flows through on the overcurrent relay 1:
IT＝IRA+ISB＝ITC＝0、5(p.u)
Like this, same when arranged side by side with 2, the rated current of capacitor SCA is 1,0 (p.u), thus the adjusted value of adjusting of overcurrent relay 1 get final product than 1 the 50% low decision of rated current of capacitor separate unit in 3, but the total electric current high sensitivity of 3 of comparisons.
Like this, by structure of the present utility model, the adjusted value of abnormal detector is that the basis is decided with the rated current of each capacitor separate unit of connection arranged side by side preferably.And, the capacitor inside of above-mentioned explanation is that 2 sections series connection continue, because according to the difference of series connection hop count, the size of current that flows through in the overcurrent relay also can change, so the adjusted value of abnormal detector can be set at 10%～100% of capacitor separate unit load current value.
In addition, be illustrated with 3 situations about being connected side by side with regard to 2 of capacitor separate units in the electric power system of phase three-wire three formula, the capacitor separate unit that connects side by side in the electric power system of phase three-wire three formula is not limited to 2 and 3, also can detect fault as the connection arranged side by side more than 4 as being suitable for the manner.
Claims (2)
1. capacitor equipment, being continued side by side by several capacitor separate units that are connected in each phase of phase three-wire three formula electric power system forms;
It is characterized in that, by the current transformer that inserts capacitor and each phase of phase three-wire three formula electric power system with current transformer be connected the overcurrent relay of importing its output side by side form;
In the electric power system of phase three-wire three formula with a plurality of connection arranged side by side of aforementioned capacitor separate unit the time, each goes up respectively and distributes the aforementioned current transformer of three-phase part mutually in the difference of the capacitor separate unit that connects side by side.
2. a kind of capacitor equipment in the capacitor equipment as claimed in claim 1 is decided to be the adjusted value of abnormal detector 10%～100% specified scope of each capacitor separate unit of connection arranged side by side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920006037XU CN201364821Y (en) | 2009-03-02 | 2009-03-02 | Capacitor device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920006037XU CN201364821Y (en) | 2009-03-02 | 2009-03-02 | Capacitor device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201364821Y true CN201364821Y (en) | 2009-12-16 |
Family
ID=41475493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200920006037XU Expired - Lifetime CN201364821Y (en) | 2009-03-02 | 2009-03-02 | Capacitor device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201364821Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3346478A1 (en) * | 2017-01-09 | 2018-07-11 | Siemens Aktiengesellschaft | Capacitor system and subsea electrical system comprising it |
-
2009
- 2009-03-02 CN CNU200920006037XU patent/CN201364821Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3346478A1 (en) * | 2017-01-09 | 2018-07-11 | Siemens Aktiengesellschaft | Capacitor system and subsea electrical system comprising it |
| US10622158B2 (en) | 2017-01-09 | 2020-04-14 | Siemens Aktiengesellschaft | Capacitor system |
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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: 20091216 |
|
| CX01 | Expiry of patent term |