CN205665345U - Phase to earth fault emulation testing system - Google Patents
Phase to earth fault emulation testing system Download PDFInfo
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- CN205665345U CN205665345U CN201620559901.9U CN201620559901U CN205665345U CN 205665345 U CN205665345 U CN 205665345U CN 201620559901 U CN201620559901 U CN 201620559901U CN 205665345 U CN205665345 U CN 205665345U
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- 230000007935 neutral effect Effects 0.000 claims abstract description 43
- 230000005611 electricity Effects 0.000 claims description 19
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- 238000004088 simulation Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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Abstract
The utility model relates to a phase to earth fault emulation testing system, generating line module including neutral point grounding module, phase to earth fault module, three phase line emulation module, control box, three -phase switch and connection three phase line emulation module, neutral point grounding module includes grounding transformer, coil switch, resistive switching, arc suppressing coil and neutral resistance, and grounding transformer is the generating line module even, the parallelly connected neutral resistance of first branch road of arc suppressing coil and the series connection of coil switch and the second branch road that resistive switching establishes ties to ally oneself with even grounding transformer of back one end, other end ground connection, the phase to earth fault module includes first switch, second switch, first resistance and second resistance, first resistance and the fourth branch road of the parallelly connected second resistance of the third branch road of first switch series connection with the second switch series connection to ally oneself with even three -phase switch of back one end, other end ground connection, three -phase switch is control box and three phase line emulation module even. The utility model discloses the emulation mode is diversified.
Description
Technical field
This utility model relates to technical field of power systems, particularly relates to a kind of singlephase earth fault l-G simulation test system
System.
Background technology
The fault that during singlephase earth fault, distribution system is common.According to fault time and the stability of earth resistance, single-phase
Earth fault can be divided into stabilized single phase earth fault and unstable singlephase earth fault.Wherein stabilized single phase earth fault refers to
Earth resistance is stable at certain definite value or the continual and steady burning of electric arc, at this moment can be divided into again according to the size of earth resistance
High resistance grounding fault, low resistance (or metallic earthing) earth fault；Unstable singlephase earth fault refers to ground connection event
Barrier is moment or off and on, can be divided into the most again moment arcing ground and intermittent arcing ground.Unstable
Earth fault can cause intermittency electric arc's earthing over-voltage.For preventing systematic failures, ensureing the power supply reliability of system, person peace
Entirely, equipment is safely etc., it usually needs distribution system carries out singlephase earth fault l-G simulation test, during reproduction singlephase earth fault
Fault signature, thus be analyzed research for failure condition and promote the troubleshooting capability of single-phase earthing.
Traditional platform that singlephase earth fault carries out l-G simulation test is mainly used in detection and the tune of fault line selection device
Examination, generally uses certain singlephase earth fault under physical object simulating a certain kind neutral ground pattern, and analog form is single.
Utility model content
Based on this, it is necessary to for the problems referred to above, it is provided that a kind of support to emulate multiple neutral ground pattern and single-phase connect
The singlephase earth fault emulation test system of earth fault type.
A kind of singlephase earth fault emulation test system, including neutral ground module, singlephase earth fault module, three-phase
Circuit emulation module, control box, threephase switch and the busbar modules of offer three-phase voltage；
Described neutral ground module and three-phase line emulation module connect described busbar modules, described threephase switch defeated
Entering end and connect described three-phase line emulation module, the outfan of described threephase switch connects described singlephase earth fault module, institute
The control end stating threephase switch connects described control box, and described control box controls the break-make of described threephase switch, to control three-phase
Circuit emulation module and the connection of singlephase earth fault module；
Described neutral ground module includes grounding transformer, coil switch, resistance switch, arc suppression coil and neutral point
Earth resistance, the primary coil of described grounding transformer connects described busbar modules, described arc suppression coil and described coil switch
First branch road in series, described neutral resistance and described resistance switch the second branch road in series, described first
Road is connected the secondary coil of described grounding transformer, other end ground connection with one end after described second branch circuit parallel connection；
Described singlephase earth fault module includes the first switch, second switch, the first resistance and the second resistance, described first
Resistance switchs the 3rd branch road in series, described second resistance and 4th in series of described second switch with described first
Road, described 3rd branch road is connected the outfan of described threephase switch, other end ground connection with one end after described 4th branch circuit parallel connection.
Above-mentioned singlephase earth fault emulation test system, is that neutral ground module and three-phase line are imitated by busbar modules
True module provides three-phase voltage, the distance of three-phase line emulation module analogue simulation circuit, and control box can be by controlling three-phase
Switch on-off thus control the connection of three-phase line emulation module and singlephase earth fault module, it is achieved singlephase earth fault is imitated
The route choosing of true test.In neutral ground module, when coil switch Guan Bi, resistance switch disconnect, arc suppression coil and line
The first branch road conducting that circle switch is in series, grounding transformer passes through grounding through arc, is now that neutral point is through arc blowout wire
Circle ground connection pattern；When coil switch disconnect, resistance switch Guan Bi time, neutral resistance in series with resistance switch the
Two branch road conductings, grounding transformer passes through neutral resistance ground connection, is now Neutral Grounding through Resistance in Electrical pattern；Work as coil
When switch, resistance switch all disconnect, grounding transformer is earth-free, is now the ungrounded pattern of neutral point.Opened by control coil
Close and the closed and disconnected of resistance switch, can control to select neutral ground pattern.In singlephase earth fault module, when first
When switch Guan Bi, second switch disconnect, the first resistance and first switchs the 3rd branch road conducting in series, if now three-phase is opened
The Central Shanxi Plain is a certain to be conducted, then to should the circuit of three-phase line emulation module of phase by the first resistance eutral grounding；When the first switch
Disconnect, second switch Guan Bi time, the second resistance fourth branch road in series with second switch turns on, if now in threephase switch
A certain be conducted, then to should the three-phase line emulation module of phase by the second resistance eutral grounding.By control first switch, second
The closed and disconnected of switch, can select by different singlephase earth fault types.Therefore, the singlephase earth fault of the present invention
Emulation test system can support multiple neutral ground pattern and multiple singlephase earth fault type, simulation type variation.
Accompanying drawing explanation
Fig. 1 is the attachment structure figure of singlephase earth fault emulation test system in an embodiment；
Fig. 2 is the attachment structure figure of singlephase earth fault emulation test system in another embodiment；
Fig. 3 is the concrete structure figure of singlephase earth fault emulation test system in an embodiment；
Fig. 4 is isolating transformer and the circuit diagram of fairing in an embodiment；
Fig. 5 is the circuit diagram of π type Equivalent Model in an embodiment；
Fig. 6 is the partial circuit diagram of control box in an embodiment.
Detailed description of the invention
With reference to Fig. 1, the singlephase earth fault emulation test system in an embodiment, including neutral ground module 110, carry
For the busbar modules 120 of three-phase voltage, three-phase line emulation module 130, threephase switch 140, singlephase earth fault module 150 and
Control box 160.
Neutral ground module 110 and three-phase line emulation module 130 connect busbar modules 120, threephase switch 140 defeated
Entering end and connect three-phase line emulation module 130, the outfan of threephase switch 140 connects singlephase earth fault module 150, and three-phase is opened
Closing the control end attended operation case 160 of 140, control box 160 controls the break-make of threephase switch 140, to control three-phase line emulation
Module 130 and the connection of singlephase earth fault module 150.
Neutral ground module 110 include grounding transformer 111, coil switch Q1, resistance switch Q2, arc suppression coil L0 and
Neutral resistance R0.The primary coil of grounding transformer 111 connects busbar modules 120, arc suppression coil L0 and coil switch
Q1 the first branch road in series, neutral resistance R0 and resistance switch Q2 the second branch road in series, the first branch road and the
After two branch circuit parallel connections, one end connects the secondary coil of grounding transformer 111, other end ground connection.
Singlephase earth fault module 150 includes the first switch Q3, second switch Q4, the first resistance r and the second resistance rh, the
One resistance r and first switch Q3 the 3rd branch road in series, the second resistance rh and second switch Q4 the 4th branch road in series, the
After three branch roads and the 4th branch circuit parallel connection, one end connects the outfan of threephase switch 140, other end ground connection.Specifically, the first resistance r
Resistance unequal with the resistance of the second resistance rh.
Specifically, busbar modules 120 and three-phase line emulation module 130 all include three-phase line, respectively A phase line, B
Phase line and C phase line.Busbar modules 120 is for providing to neutral ground module 110 and three-phase line emulation module 130
Three-phase voltage, in this enforcement, the three-phase voltage that busbar modules 120 provides is high pressure (magnitude of voltage is more than or equal to 10KV), three-phase
Circuit emulation module 130 is for the distance of analogue simulation circuit.Threephase switch 140 includes that three action contacts, three actions touch
Head all includes input, outfan and control end；Three-phase line connects the defeated of busbar modules 120 and three action contacts respectively
Entering end, the outfan of three action contacts is all connected with singlephase earth fault module 150, and the control end of three action contacts is respectively
Connect control chamber 160.Control chamber 160 controls the conducting of certain action contact, then touch with this action in three-phase line emulation module 130
The connection that head connects is to singlephase earth fault module 150.That is, control box 160 can be from three-phase line emulation module 130
Three-phase line select a phase line connect singlephase earth fault module 150.
Above-mentioned singlephase earth fault emulation test system, is neutral ground module 110 and three-phase by busbar modules 120
Circuit emulation module 130 provides three-phase voltage, and the distance of three-phase line emulation module 130 analogue simulation circuit, control box 160 can
To control three-phase line emulation module 130 and singlephase earth fault module 150 by controlling the break-make of threephase switch 140
Connect, it is achieved the route choosing of singlephase earth fault l-G simulation test.In neutral ground module 110, when coil switch Q1 close,
When resistance switch Q2 disconnects, the first branch road conducting in series with coil switch Q1 for arc suppression coil L0, grounding transformer 111 leads to
Cross grounding through arc, be now neutral by arc extinction coil grounding pattern；When coil switch Q1 disconnection, resistance switch Q2 Guan Bi
Time, the second branch road conducting in series with resistance switch Q2 for neutral resistance R0, grounding transformer 111 passes through neutral point
Earth resistance R0 ground connection, is now Neutral Grounding through Resistance in Electrical pattern；When coil switch Q1, resistance switch Q2 all disconnect, connect
Ground transformator 111 is earth-free, is now the ungrounded pattern of neutral point.By control coil switch Q1 and the Guan Bi of resistance switch Q2
And disconnection, can control to select neutral ground pattern.In singlephase earth fault module 150, when first switch Q3 Guan Bi, second
When switch Q4 disconnects, the first resistance r turns on the first the 3rd branch road in series for switch Q3, if now in threephase switch 140
A certain be conducted, then to should the circuit of three-phase line emulation module 130 of phase by the first resistance r ground connection；When the first switch
Q3 disconnects, second switch Q4 Guan Bi time, the 4th branch road in series with second switch Q4 for the second resistance rh turns on, if now three
A certain being conducted of switch 140 mutually, then to should the three-phase line emulation module 130 of phase by the second resistance rh ground connection.Pass through
Control the first switch Q3, closed and disconnected of second switch Q4, can select by different singlephase earth fault types.Cause
This, the singlephase earth fault emulation test system of the present invention can support multiple neutral ground pattern and the event of multiple single-phase earthing
Barrier type, simulation type variation.
With reference to Fig. 2, neutral ground module 110, busbar modules 120, three-phase line emulation module 130, threephase switch 140
Can be arranged in same test cage 200 with singlephase earth fault module 150, control box 160 is arranged at outside test cage 200,
Staff can be tested by the internal singlephase earth fault that is simulated of outside control box 160 Control experiment cage 200.
In one embodiment, referring to figs. 2 and 3, above-mentioned singlephase earth fault emulation test system also includes power distribution cabinet
100, booster transformer 101 and isolating transformer 102 and fairing 103.Power distribution cabinet 100 connects at the beginning of booster transformer 101
Level coil and the primary coil of isolating transformer 102, the secondary coil of booster transformer 101 connects busbar modules 120, and rectification fills
Put the secondary coil of the input connection isolating transformer 102 of 103, outfan attended operation case 160.
Power distribution cabinet 100 exports supply voltage to booster transformer 101 and isolating transformer 102, and booster transformer 101 is to confession
Piezoelectric voltage exports high pressure to busbar modules 120 after boosting, isolating transformer 102 receives and exports isolation voltage after supply voltage
To fairing 103, fairing 103 exports DC voltage to control box 160 after receiving isolation voltage.By power distribution cabinet 100,
Booster transformer 101 and isolating transformer 102 and the combination of fairing 103, can be that busbar modules 120 provides high-voltage alternating
Electricity, provides unidirectional current for control box 160 simultaneously.
In one embodiment, power distribution cabinet 100 is 400V (volt) power distribution cabinet, and booster transformer 101 is equal to 0.4:10 for no-load voltage ratio
Booster transformer.Therefore, the high pressure that booster transformer 101 exports to busbar modules 120 is 10KV (kilovolt), now, single-phase
Earth fault emulation test system can be applicable to the distribution circuit single-phase earth fault emulation of 10KV.Specifically, in the present embodiment,
The unidirectional current of fairing 103 output is 220V.
In one embodiment, with reference to Fig. 3, above-mentioned singlephase earth fault emulation test system also includes three voltage instructions
Table, respectively voltage dial gauge VA, voltage dial gauge VB and voltage dial gauge VC, voltage dial gauge VA, voltage dial gauge VB and
One end of voltage dial gauge VC connects booster transformer 101, and the other end connects busbar modules 120.Specifically, three voltage instructions
Table connects the three-phase line of busbar modules 120 respectively.So, magnitude of voltage can be detected by voltage dial gauge.
In one embodiment, with reference to Fig. 3, above-mentioned singlephase earth fault emulation test system also includes the first current transformer
CT01 and contact switch Q, the three-phase line of the secondary coil of booster transformer 101 connects after the first Current Transmit 01
Contact switch Q one end, the contact switch Q other end connects busbar modules 120.
In one embodiment, with reference to Fig. 3, neutral ground module 110 also includes the second Current Transmit 1, and ground connection becomes
The neutral point of the secondary coil of depressor 111 connects the first branch road and the second branch road after being routed through the second Current Transmit 1.
In one embodiment, with reference to Fig. 3, above-mentioned singlephase earth fault emulation test system also includes main switch Q0, distribution
Cabinet 100 connects booster transformer 101 and isolating transformer 102 by main switch Q0.By power distribution cabinet 100 and booster transformer
Between 101 and isolating transformer 102, main switch Q0 is set, when being made without singlephase earth fault emulation, can be by closing
Disconnected main switch Q0 thus disconnect power distribution cabinet 100 and booster transformer 101 and the connection of isolating transformer 102, it is to avoid when system is long
Between charged, improve safety.
With reference to Fig. 4, for isolating transformer 102 and the circuit diagram of fairing 103.Main switch Q0 controls, and uses C phase electric
Source, exports AC (alternating voltage) 220V, through the full-bridge diode D1 rectification of fairing 103 after isolating transformer 102
And capacitor filtering, finally export DC (DC voltage) 220V and work for control box 160.
In one embodiment, with reference to Fig. 3, above-mentioned singlephase earth fault emulation test system also include extra switch Q01 and
Device for fusing FU, main switch Q0 connects device for fusing FU one end, and the device for fusing FU other end connects extra switch Q01 one end, attached
Add the switch Q01 other end and connect booster transformer 101 and the primary coil of isolating transformer 102.By at main switch Q0 and liter
Connect extra switch Q01 and fuse FU between pressure transformer 101, isolating transformer 103, the peace of system can be improved further
Quan Xing.
In one embodiment, with reference to Fig. 3, three-phase line emulation module 130 includes multiple three-phase aerial line emulation module 131
With multiple three-phase electricity cable emulation modules 132, the quantity of threephase switch 140 is three-phase aerial line emulation module 131 and three-phase electricity
The quantity sum of cable emulation module 132.Multiple three-phase aerial line emulation modules 131 are sequentially connected in series, and after series connection, one end connects
Busbar modules 120；Multiple three-phase electricity cable emulation modules 132 are sequentially connected in series, and after series connection, one end connects busbar modules 120；Often
One three-phase aerial line emulation module 131 and three-phase electricity cable emulation module 132 are connected respectively a threephase switch 140.
In the present embodiment, the quantity of three-phase aerial line emulation module 131 and three-phase electricity cable emulation module 132 is 15.
The series connection of multiple three-phase aerial line emulation modules 131 is for imitating the circuit distance of aerial line, multiple three-phase electricity cables
Emulation module 132 series connection is for imitating the circuit distance of cable.So, above-mentioned singlephase earth fault emulation test system is permissible
Simulate multiple distribution line, the multiformity of copying can be improved.
In one embodiment, with reference to Fig. 3 and Fig. 5, three-phase aerial line emulation module 131 include the first phase inductance L1, first
Phase resistance R1, first phase the first electric capacity C1, first phase the second electric capacity C2, the second phase inductance L2, the second phase resistance R2, the second phase
One electric capacity C3, second phase the second electric capacity C4, third phase inductance L3, third phase resistance R3 and third phase the first electric capacity C5 and third phase
Second electric capacity C6.
First phase inductance L1 and the series connection of the first phase resistance R1, the first phase inductance L1 other end connects busbar modules 120 or phase
Adjacent three-phase aerial line emulation module 131, and by first phase the first electric capacity C1 one end ground connection；Specifically, if three-phase aerial line
Emulation module 131 is positioned at after the series connection of multiple three-phase aerial line emulation module 131 for connecting one end of busbar modules 120, then and three
The first phase inductance L1 other end of phase aerial line emulation module 131 connects busbar modules 120, the otherwise first phase inductance L1 other end
Connect adjacent three-phase aerial line emulation module 131.The first phase resistance R1 other end connects adjacent three-phase aerial line emulation mould
Block 131 or external loading, and by first phase the second electric capacity C2 ground connection.Specifically, it is positioned at when three-phase aerial line emulation module 131
The former least significant end from busbar modules 120 after series connection, then the first phase resistance R1 other end connects external loading, otherwise connects adjacent
Three-phase aerial line emulation module 131.
Second phase inductance L2 and the series connection of the second phase resistance R2, the second phase inductance L2 other end connects busbar modules 120 or phase
Adjacent three-phase aerial line emulation module 131, and by second phase the first electric capacity C3 ground connection；The second phase resistance R2 other end connects phase
Adjacent three-phase aerial line emulation module 131 or external loading, and by second phase the second electric capacity C4 ground connection.
Third phase inductance L3 connects with third phase resistance R3, and the third phase inductance L3 other end connects busbar modules 120 or phase
Adjacent three-phase aerial line emulation module 131, and by third phase the first electric capacity C5 ground connection, the third phase resistance R3 other end connects phase
Adjacent three-phase aerial line emulation module 131 or external loading, and by third phase the second electric capacity C6 ground connection.
In the present embodiment, the first phase inductance L1, the first phase resistance R1, first phase the first electric capacity C1, first phase the second electric capacity
C2, the second phase inductance L2, the second phase resistance R2, second phase the first electric capacity C3, second phase the second electric capacity C4, third phase inductance L3,
Third phase resistance R3 and third phase the first electric capacity C5 and third phase the second electric capacity C6 constitutes π type Equivalent Model, i.e. each three-phase
Aerial line emulation module 131 π type Equivalent Model the most as shown in Figure 6 builds, the resistance of each π type Equivalent Model and electric capacity
Can configure the most voluntarily.Such as, in a specific embodiment, π type Equivalent Model parameter is as shown in table 1.
| Mark | Unit | Three-phase aerial line emulation module | Three-phase electricity cable emulation module | |
| Positive sequence resistance | R1 | Ω/km | 0.21 | 0.123 |
| Positive sequence inductance | X1 | mH/km | 1.273 | 0.229 |
| Positive sequence electric capacity | C1 | μF/km | 0.00907 | 0.284 |
| Zero sequence resistance | R0 | Ω/km | 0.21 | 1.23 |
| Zero sequence inductance | X0 | mH/km | 7.003 | 0.917 |
| Zero sequence electric capacity | C0 | μF/km | 0.00466 | 0.25833 |
Table 1
Three-phase aerial line emulation module 131 is designed as π type Equivalent Model, and fidelity is high, can improve singlephase earth fault
The accuracy of emulation.Specifically, the structure of three-phase electricity cable emulation module 132 is identical, also with three-phase aerial line emulation module 131
For π type Equivalent Model, do not repeat at this.
In the present embodiment, control box 160 uses reliable interlock circuit, the corresponding interlocking of each π type Equivalent Model
Circuit, mutually restricts between multiple interlock circuits, when selecting any one phase line of any one π type Equivalent Model to test,
The mutually locking all automatically of remaining π type Equivalent Model correspondence interlock circuit.With reference to Fig. 6, to control the A phase of a π type Equivalent Model
As a example by the interlock circuit of line-to-ground step switch 140 break-make, K0 is the normally-closed contact of a relay, and K0R is to drive continuing of K0
Electric apparatus coil；K4 is the normally-closed contact of a relay, and J1 is the relay coil driving K4；K1, K2, K3 are the three of a relay
Individual normally opened contact, K1R is the relay coil driving K1, K2, K3.Its operation principle is: when needs select and this operation circuit
During the A phase line of π type Equivalent Model connected, pressing the operation button K1G, now positive source is through normally-closed contact K0, two poles
Pipe D1 is added to relay coil K1R, relay coil K1R energising, controls tri-normally opened contact Guan Bis of corresponding K1, K2, K3, this
Time relay coil K0R energising (positive source is added to relay coil through normally-closed contact K0, diode D1 and normally opened contact K1
K0R) and relay coil J1 energising, relay coil K0R control normally-closed contact K0 disconnect, relay coil J1 control normally closed
Contact K4 disconnects, thus the power supply excising other mutual interlocking gear is powered；The Guan Bi of normally opened contact K1-K3 can ensure that relay
Coil K0 is energized, and during until unclamping operation button K1G, the relay coil K0 of firm action loses negative electricity involution, controls normally closed touching
Point K0 Guan Bi, complete select the A phase line of π type Equivalent Model being connected with π 1A carry out high-voltage earthing fault simulation simulation
Process.It is appreciated that the operation electricity operating circuit and A phase line that the B phase line of π type Equivalent Model is corresponding with C phase line
The operation principle on road is identical, does not repeats at this.By arranging the control box 160 of interlock circuit, it is possible to prevent multiple spot to occur
Single-phase earthing and cause phase fault.
In one embodiment, singlephase earth fault module 150 also includes that the 3rd switch Q5, the 3rd switch Q5 one end connect three
The outfan of switch 140, other end ground connection mutually.That is, the 3rd switch Q5, the first resistance r switchs Q3 in series the with first
Three branch roads, the 4th branch road in series with second switch Q4 for the second resistance rh, this three is parallel with one another, and after parallel connection, one end connects
The outfan of threephase switch 140, other end ground connection.When the first switch Q3 and second switch Q4 all disconnects, the 3rd switch Q5 Guan Bi
Time, singlephase earth fault module 150 can simulate the pattern of being directly grounded.By arranging the 3rd switch Q5, single-phase connecing can be increased
The simulation model of earth fault 150, improves functional diversity.
In one embodiment, with reference to Fig. 3, above-mentioned singlephase earth fault emulation test system also includes ground connection discharge switch
Q17, ground connection discharge switch Q17 one end connects busbar modules 120, other end ground connection.During ground connection discharge switch Q17 Guan Bi, bus
Module 120 ground connection is discharged, and staff is caused unexpected injury by the high pressure that busbar modules 120 can be avoided to provide.Such as, central
Property point earthing module 110, busbar modules 120, three-phase line emulation module 130, landing operation switch 140 and singlephase earth fault
Module 150 is respectively positioned on test cage 200, and when high pressure exits test cage, automatic splice grafting ground discharge switch Q17 is to discharge over the ground, now
The higher-pressure region electromagnetism of test cage 200 is locked a door and just can be opened, and staff can enter to test cage 200 operation.
In one embodiment, with reference to Fig. 3, above-mentioned singlephase earth fault emulation test system also includes connecting busbar modules
The three-phase instruction device 170 of 120.When the circuit normal power-up of busbar modules 120, three-phase instruction device 170 bright light.By setting
Put three-phase instruction device 170, it is simple to the duty of instruction busbar modules 120.Specifically, three-phase instruction device 170 includes three
Individual display lamp and three electric capacity, one instruction lamp and a capacitances in series constitute a branch road, each branch road is connected respectively mother
One phase line of wire module 120, therefore, a display lamp may be used to indicate the duty of this phase line.
In one embodiment, with reference to Fig. 3, above-mentioned singlephase earth fault emulation test system also include embedding threephase cable,
Line module current transformer 180 and line module voltage transformer 190.Embed threephase cable one end and connect three-phase line emulation
Module 130, the other end connects the input of threephase switch 140 after passing current transformer 180, voltage transformer 190 is once
Side connects three-phase line emulation module 130, the secondary side ground connection of voltage transformer 190.
Specifically, the no-load voltage ratio of current transformer 180 with in scene current transformer use no-load voltage ratio identical, thus ensure right
System is once simulated with the 1:1 of secondary current.
In the present embodiment, current transformer 180 includes threephase current transformer and zero sequence current mutual inductor, and three-phase current is mutual
The quantity of sensor 180 is equal with the quantity of three-phase aerial line emulation module 131, the quantity of zero sequence current mutual inductor and threephase cable
The quantity of line emulation module 132 is equal.Specifically, the corresponding three-phase current of each three-phase aerial line emulation module 131 is mutual
Sensor, the corresponding zero sequence current mutual inductor of each three-phase electricity cable emulation module 132.Each three-phase aerial line emulation module
131 and cable emulation module 132 connection line module voltage transformer 190 respectively.
In one embodiment, above-mentioned singlephase earth fault emulation test system also includes connecting three-phase line emulation module
The record wave screen (not shown) of 130.Three-phase line emulation module 130 exports electric current, voltage to recording wave screen, and record wave screen can show electricity
Stream oscillogram and voltage oscillogram.Therefore, by arranging the record wave screen connecting three-phase line emulation module 130, work can be facilitated
Electric current under personnel check current operating state and voltage.
Specifically, in one embodiment, record wave screen has two.One of them record wave screen is connected to three photo frames of multiple series connection
Ceases to be busy emulation module 131 is imitated away from one end of busbar modules 120, the three-phase electricity cable that another record wave screen is connected to multiple series connection
True module 132 is away from one end of busbar modules 120.So, can simulated line and threephase cable to three-phase aerial line respectively
Current/voltage in the simulated line of line is acquired, in order to staff checks oscillogram.
Each technical characteristic of above example can combine arbitrarily, for making description succinct, not to above-described embodiment
In all possible combination of each technical characteristic be all described, but, as long as there is not lance in the combination of these technical characteristics
Shield, is all considered to be the scope that this specification is recorded.
Above example only have expressed several embodiments of the present utility model, and it describes more concrete and detailed, but also
Therefore the restriction to utility model patent scope can not be interpreted as.It should be pointed out that, for the ordinary skill people of this area
For Yuan, without departing from the concept of the premise utility, it is also possible to make some deformation and improvement, these broadly fall into this reality
With novel protection domain.Therefore, the protection domain of this utility model patent should be as the criterion with claims.
Claims (10)
1. a singlephase earth fault emulation test system, it is characterised in that include neutral ground module, singlephase earth fault
Module, three-phase line emulation module, control box, threephase switch and the busbar modules of offer three-phase voltage；
Described neutral ground module and three-phase line emulation module connect described busbar modules, the input of described threephase switch
Connect described three-phase line emulation module, the outfan described singlephase earth fault module of connection of described threephase switch, described three
The control end switched mutually connects described control box, and described control box controls the break-make of described threephase switch, to control three-phase line
Emulation module and the connection of singlephase earth fault module；
Described neutral ground module includes grounding transformer, coil switch, resistance switch, arc suppression coil and neutral ground
Resistance, the primary coil of described grounding transformer connects described busbar modules, and described arc suppression coil is connected with described coil switch
Constitute the first branch road, described neutral resistance and described resistance switch the second branch road in series, described first branch road with
After described second branch circuit parallel connection, one end connects the secondary coil of described grounding transformer, other end ground connection；
Described singlephase earth fault module includes the first switch, second switch, the first resistance and the second resistance, described first resistance
The 3rd branch road in series, described second resistance and described second switch the 4th branch road in series, institute is switched with described first
State the 3rd branch road and be connected the outfan of described threephase switch, other end ground connection with one end after described 4th branch circuit parallel connection.
Singlephase earth fault emulation test system the most according to claim 1, it is characterised in that described three-phase line emulates
Module includes multiple three-phase aerial line emulation module and multiple three-phase electricity cable emulation module, and the quantity of described threephase switch is institute
State the quantity sum of three-phase aerial line emulation module and three-phase electricity cable emulation module；
The plurality of three-phase aerial line emulation module is sequentially connected in series, and after series connection, one end connects described busbar modules, the plurality of
Three-phase electricity cable emulation module is sequentially connected in series, and after series connection, one end connects described busbar modules, each described three-phase aerial line
Emulation module and described three-phase electricity cable emulation module are connected respectively a described threephase switch.
Singlephase earth fault emulation test system the most according to claim 2, it is characterised in that described three-phase aerial line is imitated
True module include the first phase inductance, the first phase resistance, first phase the first electric capacity, first phase the second electric capacity, the second phase inductance, second
Phase resistance, second phase the first electric capacity, second phase the second electric capacity, third phase inductance, third phase resistance and third phase the first electric capacity and
Third phase the second electric capacity；
Described first phase inductance is connected with described first phase resistance, described first the phase inductance other end connect described busbar modules or
Adjacent three-phase aerial line emulation module, and by described first phase the first capacity earth；The described first phase resistance other end is even
Connect adjacent three-phase aerial line emulation module or external loading, and by described first phase the second capacity earth；
Described second phase inductance is connected with described second phase resistance, described second the phase inductance other end connect described busbar modules or
Adjacent three-phase aerial line emulation module, and by described second phase the first capacity earth, the described second phase resistance other end is even
Connect adjacent three-phase aerial line emulation module or external loading, and by described second phase the second capacity earth；
Described third phase inductance and described third phase resistant series, the described third phase inductance other end connect described busbar modules or
Adjacent three-phase aerial line emulation module, and by described third phase the first capacity earth, the described third phase resistance other end is even
Connect described adjacent three-phase aerial line emulation module or external loading, and by described third phase the second capacity earth.
Singlephase earth fault emulation test system the most according to claim 1, it is characterised in that also include power distribution cabinet, liter
Pressure transformer and isolating transformer and fairing, described power distribution cabinet connect described booster transformer primary coil and described every
From the primary coil of transformator, the secondary coil of described booster transformer connects described busbar modules, described fairing defeated
Entering end and connect the secondary coil of described isolating transformer, the outfan of described fairing connects described control box.
Singlephase earth fault emulation test system the most according to claim 4, it is characterised in that described power distribution cabinet is 400V
Power distribution cabinet, described booster transformer is the booster transformer that no-load voltage ratio is equal to 0.4:10.
Singlephase earth fault emulation test system the most according to claim 4, it is characterised in that also include main switch, institute
State power distribution cabinet and connect described booster transformer and described isolating transformer by described main switch.
Singlephase earth fault emulation test system the most according to claim 1, it is characterised in that also include that ground connection electric discharge is opened
Closing, described ground connection discharge switch one end connects described busbar modules, other end ground connection.
Singlephase earth fault emulation test system the most according to claim 1, it is characterised in that also include connecting described mother
The three-phase instruction device of wire module.
Singlephase earth fault emulation test system the most according to claim 1, it is characterised in that also include embedding three-phase electricity
Cable, current transformer and voltage transformer, described embedding threephase cable one end connects described three-phase line emulation module, the other end
Connecting the input of described threephase switch after described current transformer, the primary side of described voltage transformer connects described
Three-phase line emulation module, the secondary side ground connection of described voltage transformer.
Singlephase earth fault emulation test system the most according to claim 1, it is characterised in that also include that connection is described
The record wave screen of three-phase line emulation module.
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| CN201620559901.9U CN205665345U (en) | 2016-06-08 | 2016-06-08 | Phase to earth fault emulation testing system |
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| CN106920444A (en) * | 2017-04-30 | 2017-07-04 | 国网江苏省电力公司职业技能训练基地 | A kind of equipment of analog line single-phase earthing |
| CN107390075A (en) * | 2017-09-05 | 2017-11-24 | 云南电网有限责任公司电力科学研究院 | A kind of device for power distribution network single phase grounding test |
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| CN109283437A (en) * | 2018-11-06 | 2019-01-29 | 国网四川省电力公司技能培训中心 | PT disconnection and single-phase ground fault simulation device and method |
| CN109738843A (en) * | 2019-02-25 | 2019-05-10 | 广州能瑞电力科技有限公司 | A π-type equivalent circuit network for simulating complex distribution lines |
| CN109738843B (en) * | 2019-02-25 | 2024-03-29 | 广州能瑞电力科技有限公司 | Pi-type equivalent circuit network for simulating complex distribution line |
| CN111127987A (en) * | 2020-01-15 | 2020-05-08 | 西安热工研究院有限公司 | Simulation model for calculating transmission overvoltage of generator-transformer set in PSCAD (power system computer aided design) |
| CN115877116A (en) * | 2021-09-28 | 2023-03-31 | 李景禄 | Distribution line fault area isolation simulation test method |
| CN114200345A (en) * | 2021-12-15 | 2022-03-18 | 江苏现代电力科技股份有限公司 | Low-current true grounding test system |
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