CN203850813U - Overvoltage-inhibiting integrated protection device suitable for 12-45kV electrical networks - Google Patents
Overvoltage-inhibiting integrated protection device suitable for 12-45kV electrical networks Download PDFInfo
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- CN203850813U CN203850813U CN201420247167.3U CN201420247167U CN203850813U CN 203850813 U CN203850813 U CN 203850813U CN 201420247167 U CN201420247167 U CN 201420247167U CN 203850813 U CN203850813 U CN 203850813U
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- vacuum circuit
- breaker
- circuit breaker
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Abstract
An overvoltage-inhibiting integrated protection device suitable for 12-45kV electrical networks comprises a single-phase vacuum circuit breaker K0, a three-phase compound vacuum circuit breaker KA with a self-contained isolation switch KL and a smart controller ZK. An upper end of the single-phase vacuum circuit breaker K0 is connected with a neutral point "O" of a voltage transformer in an electrical network, and a lower end of the single-phase vacuum circuit breaker K0 is connected a ground resistor r of a transformer station ground network. An upper end of the three-phase compound vacuum circuit breaker KA is connected with three-phase buses of the electrical network, and a lower end of the three-phase compound vacuum circuit breaker KA is connected with the ground resistor r of the transformer station ground network through the self-contained isolation switch KL and a reactor XL. The smart controller ZK analyzes signals of secondary sides of the voltage transformer PT and a current transformer CT to send related action commands. The isolation switch KL and the reactor XL are connected in parallel. The single-phase vacuum circuit breaker K0 is a normally-closed fracture. The overvoltage-inhibiting integrated protection device can three functions of inhibiting ferromagnetic resonance overvoltage of the voltage transformer, inhibiting single-phase arc grounding overvoltage, and automatically cutting off a single-phase permanent ground fault line.
Description
Technical field
The utility model relates to the over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network, and this protective device has: 1, can suppress Ferroresonance Overvoltage Caused by PT overvoltage; 2, also can suppress single-phase arcing ground over-voltage; 3, automatically excise three functions of single-phase continuous earth faulty line.
Background technology
In prior art, the power transformer in China's high pressure distribution is taked the operational mode of isolated neutral.
Above-mentioned operational mode exists the essential problem solving of following three aspects::
The inhibition of the ferro resonance that 1, electromagnetic potential transformer causes;
2, extinguishing fast of single-phase earthing electric arc, over-voltage suppression;
3, the automatic excision of the faulty line of permanent single-phase earthing.
During the operation of 12～45kV network system, the neutral-point solid ground of electromagnetic potential transformer high pressure winding, under normal operation, between its magnetizing inductance and the direct-to-ground capacitance of three-phase conducting wire, form zero sequence ferro resonance loop, in electrical network, inevitably voltage disturbance can excite frequency division, power frequency or high-frequency resonant overvoltage and overcurrent between this loop, causes the burnout failure of damage, instrument transformer itself and the serial connection fuse thereof of line insulation.
Existing main inhibition Ferroresonance Overvoltage Caused by PT method is: between the neutral point of instrument transformer high pressure winding and the earth, access a high value damping resistance or a single-phase potential transformer of the same type.
But above-mentioned inhibition Ferroresonance Overvoltage Caused by PT method can not play complete harmonic elimination effect, and accident still happens occasionally.
The lightening activity in the many areas of China is very strong, and the single-phase lightning accident of line insulation sub-surface happens occasionally, and forms single-phase electric arc earth fault.
In distribution, what follow lightning faulty channel closely is direct-to-ground capacitance (power frequency) electric current I of whole user's outlets
c, when outlet is more, cause I compared with length
creach 10A when above, power frequency flashover electric arc can not become from putting out the single-phase permanent earth fault that need to excise as early as possible.
For single-phase-to-ground current is limit to 10A, to guarantee normally moving from putting out with the recovery of electrical network fast of electric arc, generally adopt at present baroque arc suppression coil compensation device to shift the capacitance current of fault point, also need to set up for this reason one therewith coil same capability three-phase ground transformer, measure without a break the capacitance current of electrical network, and the control set for adjusting that a set of complexity is set, all these will take sizable locus, spend very highly, the price of the arc-extinction device of 35kV, a 50A is about more than 300,000 yuan.
In permanent single-phase earthing situation, correctly and rapidly judge fault occurs on which bar in many outlets, and then give quick solution, and be a difficult task, the solution of some more complicated that distribution system adopts at present not yet reaches satisfied effect.
Summary of the invention
The purpose of this utility model is to overcome the defect of prior art, and the over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network is provided, and this protective device has: 1, suppress Ferroresonance Overvoltage Caused by PT overvoltage; 2, extinguish single-phase earthing electric arc, over-voltage suppression; 3, automatically excise three functions of single-phase permanent earth fault.
The purpose of this utility model is achieved through the following technical solutions:
The over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network, comprises single-phase vacuum circuit breaker K
0with provide isolating switch K for oneself
lthree-phase composite formula vacuum circuit-breaker K
aand intelligent controller ZK, described single-phase vacuum circuit breaker K
0upper end connect the neutral point " O " of the voltage transformer of electrical network, lower end connects the earth resistance r of grounding net of transformer substation, described three-phase composite formula vacuum circuit-breaker K
aconnection power station, upper end three-phase bus, lower end is through its isolating switch K providing for oneself
lwith reactor X
lbe connected described three-phase composite formula vacuum circuit-breaker K with the earth resistance r of power station ground network
aalso with reactor X
lconnect, the secondary side signal of described intelligent controller ZK, input voltage instrument transformer PT summation current transformer CT, by analyzing, sends relevant action command.
Described three-phase composite formula vacuum circuit-breaker K
athe isolating switch K providing for oneself
lwith reactor X
lin parallel.
Described single-phase vacuum circuit breaker K
0for normally closed type fracture.
Described three-phase composite formula vacuum circuit-breaker K
afor fracture open in usual.
Described three-phase composite formula vacuum circuit-breaker K
ain the isolating switch K that provides for oneself
lfor normally closed type fracture.
The utility model adopts after technique scheme, can reach following beneficial effect:
1, simple in structure, reliability is high
The utility model is compared with existing over-voltage suppression equipment, simple in structure, and adopts new over-voltage suppression mechanism and blow-out mechanism, and voltage transformer electromagnetic resonance overvoltage has been disconnected to resonant tank with circuit breaker, fundamentally eliminates resonance, over-voltage suppression; To the fault of single-phase arcing ground, adopt homophase strange land earthing mode to make electric arc divided, eliminate the condition that electric arc produces, reliable blow-out, suppresses single-phase arcing ground over-voltage.Reliability is high.
Action of the present utility model is the different faults according to electrical network, by an intelligent controller, gathers fault signal, sends action command after analyzing and processing, fix a breakdown, and over-voltage, protection power grid security.
2, comprehensive function is strong, remarkable in economical benefits
The utility model collection suppresses Ferroresonance Overvoltage Caused by PT overvoltage, extinguishes single-phase electric arc earth fault, and over-voltage suppression and the large function of the permanent single phase ground fault three of cut-out are in one, and comprehensive function is strong, in addition simple in structure, remarkable in economical benefits.
Approximately 1.5 ten thousand yuan of cost prices of the present utility model, compare price with arc suppression coil system and only have 1/10～1/15, have obvious Technological Economy superiority.
3, improve the stability of electrical network, guaranteed the safe operation of electrical network
The utility model is owing to having suppressed overvoltage, and the electric equipment of supply station relevant device and user side is avoided superpotential destruction, has improved the reliability of equipment and the stability of electrical network, guarantees the safe operation of electrical network and the power quality of distrbution network.
Accompanying drawing explanation
Fig. 1 is for suppressing Ferroresonance Overvoltage Caused by PT harmonic elimination martingale mode schematic diagram;
Fig. 2 is the extinguishing arc elementary diagram of outlet 1 single-phase arcing ground in the outlet of n bar;
Fig. 3 is comprehensive winding diagram of the present utility model;
Each phase-to-ground voltage when Fig. 4 is A phase ground connection and the curve chart of residual voltage;
Fundamental diagram when Fig. 5 is A phase ground connection;
Fig. 6 is the structure chart of providing the three-phase composite formula vacuum circuit-breaker of isolating switch phase-splitting action for oneself;
Fig. 7 is intelligent controller action block diagram.
Description of reference numerals
In Fig. 1
K
0, single-phase vacuum circuit breaker r, power station ground network earth resistance;
In Fig. 2
K
a, compound type vacuum circuit breaker r, the earth resistance Ir of power station ground network be, the earth current R of power station ground network, arc road and pole tower ground resistance sum I
r, power-frequency earthing electric current I c, n bar user outlet capacitive earth current sum;
In Fig. 3
O, voltage transformer high-tension coil neutral point K
a, provide isolating switch phase-splitting action three-phase composite formula vacuum circuit-breaker Ko, single-phase vacuum circuit breaker K for oneself
l, isolating switch X
l, reactor r, power station ground network earth resistance;
In Fig. 4
U
a, A phase-to-ground voltage U
b, B phase-to-ground voltage U
c, C phase-to-ground voltage Uo, residual voltage E, power supply phase electromotive force;
In Fig. 5
R, earth resistance r
e, arc resistance;
In Fig. 6
1, upper end cover 2, insulating bar 3, vacuum extinction pipe 4, bottom end cover 5, be flexible coupling 6, touch spring 7, electric isolating switch 8, operation insulating bar 9, unicoil permanent magnetic actuator 10, underframe 101, base 11, tripping spring;
In Fig. 7
PT, voltage transformer CT, current transformer ZK, intelligent controller.
Embodiment
Below in conjunction with accompanying drawing and instantiation, the utility model is described in further detail:
Referring to Fig. 1
Fig. 1 is for suppressing Ferroresonance Overvoltage Caused by PT harmonic elimination martingale mode schematic diagram.In Fig. 1, the single-phase vacuum circuit breaker K setting up in transformer station's electrical network
0a side be connected with instrument transformer high pressure winding neutral point O, opposite side is connected with the earth resistance r of power station ground network.
Described single-phase vacuum circuit breaker K
0for normally closed type fracture.
During operation of power networks, the neutral-point solid ground of PT high pressure winding, under normal operation, between its magnetizing inductance and the direct-to-ground capacitance of three-phase conducting wire, form zero sequence ferro resonance loop, the transient voltage disturbance meeting producing in electrical network has excited frequency division, power frequency or high-frequency resonant overvoltage and overcurrent between this loop, causes the burnout failure of damage, instrument transformer itself and the serial connection fuse thereof of line insulation.Existing main inhibition method is between the neutral point of instrument transformer high pressure winding and the earth, to access a high value damping resistance or a single-phase transformers of the same type, but can not play complete harmonic elimination effect, and accident still happens occasionally.
Destroying resonant tank, to eliminate the effective way of resonance be between the high pressure winding neutral point of voltage transformer pt and the earth resistance r of substation ground network, to access a normally closed single-phase vacuum circuit breaker K
0, when there is a certain size residual voltage (PT opens three angle voltages), intelligent controller ZK is to single-phase vacuum circuit breaker K
0sending quick acting switching-off and the instruction that overlaps after a while, no longer there is resonant tank and harmonic elimination immediately in separating brake, and coincidence after a while makes voltage transformer pt and power system restoration normally move.
Concrete three-phase harmonic elimination elementary diagram as shown in Figure 1, has wherein drawn the three-phase low-voltage winding of voltage transformer pt simultaneously and has opened triangle winding.
Referring to Fig. 2
Fig. 2 is the extinguishing arc elementary diagram of the A phase arcing ground of outlet 1 in the outlet of n bar.In Fig. 2, in transformer station's electrical network, set up phase-splitting action three-phase composite formula vacuum circuit-breaker K
aupper end be connected with electrical network three-phase bus, lower end is connected with the earth resistance r of the earth resistance of power station ground network.
In distribution line, due to many reasons such as lightening activities, the single-phase flashover fault of line insulation sub-surface happens occasionally, the power-frequency earthing electric current I that it is maximum
rbe the capacitive earth current sum I of whole n bar user outlet
c, the restriction of Bing Shouhu road and pole tower ground resistance sum R.
Operating experience shows, when outlet is more, compared with long and cause the capacitive earth current sum I of n bar user outlet
creach 10A when above, power frequency flashover electric arc can not become from putting out the single-phase permanent earth fault that need to excise as early as possible.
In prior art, for by power-frequency earthing electric current I
rlimit to 10A, to guarantee normally moving from putting out with the recovery of electrical network fast of electric arc, generally adopt at present baroque automatic adjustment arc suppression coil compensation device (being connected between distribution neutral point and earth mat), so that by the capacitive earth current sum I of fault point
cshunted and shifted and automatic arc extinguishing fully; Meanwhile, need to set up one with the grounding transformer of arc suppression coil same capability so that an artificial neutral point to be provided, and need measure without a break the often capacitive earth current sum I of the n bar user outlet of change of the whole network
c, and control set for adjusting of a set of complexity etc. being set for this reason, all these costs are high, and the arc-extinction device of 35kV, a 50A is about more than 300,000 yuan, and takies sizable regional context in transformer station. and this patent proposes following new departure; According to the principle of Fig. 4, intelligent controller ZK sends instruction, three-phase composite formula vacuum circuit-breaker K after analyzing
aa closed mutually, arc road electric current I
rto substantially by r passage, be shunted, electric arc can put out smoothly certainly, after the very brief time interval, and K
atripping operation.Circuit recovers normal operation.
Referring to Fig. 3
Fig. 3 is comprehensive winding diagram of the present utility model.In Fig. 3, single-phase vacuum circuit breaker K
0upper end is connected with the high pressure winding neutral point O of voltage transformer pt, and lower end is connected with the earth resistance r of power station ground network.Single-phase vacuum circuit breaker K
0for normally closed type fracture, when electrical network generation voltage transformer pt ferro-resonance over-voltage, by the explanation action of Fig. 1, eliminate ferro resonance, suppress resonance overvoltage.Provide isolating switch phase-splitting action three-phase composite formula vacuum circuit-breaker K for oneself
aupper termination power station three-phase bus, the isolating switch K of lower end through providing for oneself
lwith reactor X
l(isolating switch K
lwith reactor X
lin parallel), be connected with the earth resistance r of the ground network in power station, when single-phase arcing ground occurs electrical network, according to the explanation of Fig. 2, move, extinguish arcs. as be permanent single-phase earthing, intelligent controller ZK starts following program by two schemes:
Option A
According to the inherent feature of zero-sequence current: the summation of the zero-sequence current that the zero-sequence current of faulty line is other circuit, and opposite direction.Through the analysis comparison of intelligent controller ZK, judge faulty line, the concurrent signal that is out of order, is processed by corresponding rules by power station operator on duty.
Option b
Intelligent controller ZK sends instruction, first by isolating switch K
lseparating brake, then by another phase breaker closing of healthy phases, separating brake after time delay.
During combined floodgate, form two-phase series reactor X
lafter, strange land ground connection, produces an alternate extra current.
Accordingly, intelligent controller ZK judges faulty line, the concurrent signal that is out of order, or the outlet protective circuit breaker of instruction faulty line tripping operation excision fault.
Referring to Fig. 4, Fig. 5
Each phase-to-ground voltage when Fig. 4 is A phase ground connection and the curve chart of residual voltage; Fundamental diagram when Fig. 5 is A phase ground connection.
In Fig. 4, Fig. 5, tan α=Xc
0/ 3R; Xc
0: the whole network is relatively total capacitive reactance often; R: natural grounding resistance Yu Hu road resistance sum; (see Fig. 5 R=r+r
e) UA, UB, UC:A, B, C tri-phase-to-ground voltages; U0: residual voltage; E: power supply phase electromotive force; From Fig. 4, can obviously find out 2 points:
1, when A phase ground connection, A phase voltage is not necessarily minimum, only 30 ° of α >,
time, the voltage of fault phase A phase is just minimum;
No matter the size of 2 R values how, always C phase voltage is the highest, therefore can utilize this point to judge fault phase: by A, B, C, A, B, C ... order is judged, A phase ground connection, and C phase voltage is the highest; B phase ground connection, A phase voltage is the highest ... by parity of reasoning.By voltage ratio and phase sequence can determine the Earth Phase of network system.
Referring to Fig. 6
Fig. 6 is the structure chart of providing the three-phase composite formula vacuum circuit-breaker of isolating switch phase-splitting action for oneself.In Fig. 6, described three-phase composite formula vacuum circuit-breaker comprises operation insulated tension pole 8 and the electric isolating switch 7 of being located on underframe 10, operation insulated tension pole 8 is by unicoil permanent magnetic actuator 9 actuatings, the bottom of being located at the vacuum interrupter 3 of electric isolating switch 7 tops is provided with bottom end cover 4, top is provided with upper end cover 1, operation insulated tension pole 8 is connected with vacuum interrupter 3 by touch spring 6, and electric isolating switch 7 is 1 (single-phase).
Described three-phase composite formula vacuum circuit-breaker K
awith reactor X
lconnect.
Described three-phase composite formula vacuum circuit-breaker K
acan phase-splitting action.
Described three-phase composite formula vacuum circuit-breaker K
ain the isolating switch K that provides for oneself
lfor normally closed type fracture.
Referring to Fig. 7
Fig. 7 is intelligent controller ZK action block diagram.In Fig. 7, intelligent controller ZK receives detection electric current, the voltage signal of relevant CT, PT of network system, according to setting program, fault signal is processed, and judges fault characteristic type, sends corresponding operation program, instruction and signal.
Motion flow:
Referring to Fig. 3, illustrate:
When network system generation Ferroresonance Overvoltage Caused by PT overvoltage, there is open delta voltage in voltage transformer low-pressure side, reaches intelligent controller, through intelligent controller analyzing and processing, to single-phase vacuum circuit breaker K
0send separating brake, reclosing command thereafter.
Separating brake is eliminated ferro resonance, and over-voltage suppression closes a floodgate and makes electrical network continue normal operation.
When single-phase electric arc earth fault occurs network system, concrete separate according to Fig. 4, by intelligent controller, ZK judges.Circuit breaker K
afault phase close, be separating brake after a while.
While closing, the most of shunting of arc current being caused to arc extinction, suppress electric arc overvoltage, is separating brake after a while, makes electrical network continue safe operation.
When there is single-phase permanent earth in network system-three-phase composite formula vacuum circuit-breaker K
aafter splitting or integrating, still have single-phase earth fault current to exist, intelligent controller ZK starts two cover protection schemes immediately:
Option A
According to the inherent feature of zero-sequence current: the zero-sequence current of faulty line is the summation of other circuit zero-sequence current, and opposite direction.
Through the analysis comparison of intelligent controller ZK, judge faulty line, the concurrent indicating signal that is out of order, is processed by corresponding rules by power station operator on duty.
Option b
Intelligent controller ZK sends instruction, first by isolating switch K
lseparating brake, then by another phase breaker closing of healthy phases, separating brake after time delay.During combined floodgate, form two-phase series reactor X
lafter, strange land ground connection, produces an alternate extra current.
Accordingly, intelligent controller ZK can judge faulty line, the concurrent alarm signal that is out of order, or the outlet protective circuit breaker of instruction faulty line tripping operation excision fault.
Other technologies of the present utility model can adopt prior art.
Most preferred embodiment of the present utility model is illustrated, and the further expansion that those of ordinary skill in the art makes according to the utility model, all falls into protection range of the present utility model.
Claims (5)
1. the over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network, comprises single-phase vacuum circuit breaker (K
0) and provide isolating switch (K for oneself
l) three-phase composite formula vacuum circuit-breaker (K
a) and intelligent controller (ZK), it is characterized in that: described single-phase vacuum circuit breaker (K
0) upper end connect the neutral point " O " of the voltage transformer of electrical network, lower end connects the earth resistance (r) of grounding net of transformer substation, described three-phase composite formula vacuum circuit-breaker (K
a) connection power station, upper end three-phase bus, lower end is through its isolating switch (K providing for oneself
l) and reactor (X
l) be connected with the earth resistance (r) of power station ground network, the secondary side signal of described intelligent controller (ZK), input voltage instrument transformer (PT) summation current transformer (CT), by analyzing, sends relevant action command.
2. the over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network according to claim 1, is characterized in that: described three-phase composite formula vacuum circuit-breaker K
aisolating switch (the K providing for oneself
l) and reactor (X
l) parallel connection.
3. the over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network according to claim 1, is characterized in that: described single-phase vacuum circuit breaker (K
0) be normally closed type fracture.
4. the over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network according to claim 1, is characterized in that: described three-phase composite formula vacuum circuit-breaker (K
a) be fracture open in usual.
5. the over-voltage suppression comprehensive protector that is applicable to 12～45kV electrical network according to claim 1, is characterized in that: described three-phase composite formula vacuum circuit-breaker (K
a) in the isolating switch (K that provides for oneself
l) be normally closed type fracture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420247167.3U CN203850813U (en) | 2014-05-14 | 2014-05-14 | Overvoltage-inhibiting integrated protection device suitable for 12-45kV electrical networks |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420247167.3U CN203850813U (en) | 2014-05-14 | 2014-05-14 | Overvoltage-inhibiting integrated protection device suitable for 12-45kV electrical networks |
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| Publication Number | Publication Date |
|---|---|
| CN203850813U true CN203850813U (en) | 2014-09-24 |
Family
ID=51563785
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|---|---|---|---|
| CN201420247167.3U Expired - Fee Related CN203850813U (en) | 2014-05-14 | 2014-05-14 | Overvoltage-inhibiting integrated protection device suitable for 12-45kV electrical networks |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU186665U1 (en) * | 2018-09-25 | 2019-01-29 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Device for protection against arc surges in a distribution network |
| CN111413910A (en) * | 2020-04-15 | 2020-07-14 | 中国铁道科学研究院集团有限公司 | Breaker opening and closing control method, device and system |
| RU2779147C1 (en) * | 2022-06-01 | 2022-09-02 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Arc overvoltage protection device for single-phase earth fault |
-
2014
- 2014-05-14 CN CN201420247167.3U patent/CN203850813U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU186665U1 (en) * | 2018-09-25 | 2019-01-29 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Device for protection against arc surges in a distribution network |
| CN111413910A (en) * | 2020-04-15 | 2020-07-14 | 中国铁道科学研究院集团有限公司 | Breaker opening and closing control method, device and system |
| RU2779881C1 (en) * | 2022-04-29 | 2022-09-14 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Device for limiting arc surges in networks with compensation of capacitive earth fault currents |
| RU2779147C1 (en) * | 2022-06-01 | 2022-09-02 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Arc overvoltage protection device for single-phase earth fault |
| RU2803647C1 (en) * | 2023-05-25 | 2023-09-19 | федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") | Method for detecting compensation mismatch in ground fault mode for controlling protective resistor in compensated networks |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20160514 |