CN104569725A - Electric power system short circuit fault test device capable of precisely controlling short circuit time - Google Patents
Electric power system short circuit fault test device capable of precisely controlling short circuit time Download PDFInfo
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- CN104569725A CN104569725A CN201510010568.6A CN201510010568A CN104569725A CN 104569725 A CN104569725 A CN 104569725A CN 201510010568 A CN201510010568 A CN 201510010568A CN 104569725 A CN104569725 A CN 104569725A
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Abstract
An electric power system short circuit fault test device capable of precisely controlling short circuit time comprises a quick short circuit eddy current drive breaker (1), three vacuum contactors (2), three quick eddy current drive breakers (3), three voltage transformers (4) and a connecting and disconnecting phase controller (5). One end of the quick short circuit eddy current drive breaker is connected to the ground, one end of each vacuum contactor is connected with one of three-phase lines of an electric power system, and the other ends of the vacuum contactors pass through the quick eddy current drive breakers and then are connected with the other end of the quick short circuit eddy current drive breaker to form a short circuit loop. One end of each voltage transformer is connected with one of the three-phase lines of the electric power system, and the other end of the corresponding voltage transformer is connected with the connecting and disconnecting phase controller. The other end of the connecting and disconnecting phase controller is connected with the other ends of all quick eddy current drive switches, voltage phase output signals on the low voltage sides of the voltage transformers are detected, and the quick eddy current drive breaker is controlled to be disconnected and connected. The electric power system short circuit fault test device can achieve the controllable voltage phase angle short circuit fault test.
Description
Technical field
The present invention relates to a kind of short-circuit fault of power system test unit, especially relate to a kind of short-circuit fault of power system test unit accurately controlling the short circuit moment based on eddy current driving fast chopper.
Background technology
Electric system is short-circuited after fault; its short circuit electromagnetic transient has material impact to electric system rapid protecting device (impedance protection is the one of rapid protecting device) etc.; realize the Performance Detection to protective device; just need accurately to control the short circuit moment; so that in the worst detection moment, obtain the lower limit of protective device performance.Current laboratory short-circuit fault test device many employings contactor realizes, but contactor branch wire time has very large dispersiveness, cannot realize the accurate control in short circuit moment, more can not realize controllable voltage phase angle short-circuit fault test.And the short trouble under different voltage phase angle, its electro-magnetic transient property difference is larger, the identification of short trouble can be affected, two waveforms shown in Fig. 3 are exactly after C phase, under different voltage phase angle, single-phase grounding fault occurs, and protective device detects and cutting-off of short-circuit electric current required time exists larger difference; Although adopt the short-circuit test device of the thyristor in power electronics can realize controllable voltage phase angle short-circuit fault test, but because turn on thyristors residual voltage is higher, metallic short circuit Test to Failure cannot be simulated, and wiring complexity when realizing phase selection separating brake, with high costs, maintainable and operational reliability is poor.Thus, realize controllable voltage phase angle short-circuit fault test, study the electro-magnetic transient characteristic of the short trouble under different voltage phase angle, to support short trouble identify fast and phase control techniques research and meet to grid supply quality control research needs, seem particularly important.
Eddy current drives fast chopper to be a kind of high-speed switch adopting electromagnetic force driving switch divide-shut brake, based on the high-speed switch of Quick eddy Driving technique, not only speed is fast, sub-switching operation can be realized in 5ms, closing operation is realized in 10m, while there is the responsiveness compared favourably with the solid-state switch of Power Electronic Technique, in cost and reliability, be also better than solid-state switch; And dispersed little, be less than 0.2ms by the dispersiveness of experimental test.Thus, based on eddy current drive the Test to Failure device of fast chopper to realize short-circuit fault test that the short circuit moment accurately controls.
There is no ripe based on eddy current drive fast chopper to realize Test to Failure device that the short circuit moment accurately controls in the market.
Summary of the invention
Technical matters to be solved by this invention, just be to provide a kind of short-circuit fault of power system test unit driving the fast chopper short circuit moment accurately to control based on eddy current, fast chopper is driven by eddy current to be applied to short-circuit fault test device, to realize controllable voltage phase angle short-circuit fault test.
Solve the problems of the technologies described above, the technical solution used in the present invention is as follows:
Accurately can control the short-circuit fault of power system test unit in short circuit moment, it is characterized in that: comprise a short circuit eddy current and drive fast chopper 1, three vacuum contactors 2, three eddy current drive fast chopper 3, three voltage transformer (VT) 4 and a conducting and cut-off phase controller 5;
Described short circuit eddy current drives fast chopper 1 one terminate ground wire, and one end of each vacuum contactor 2 drives after fast chopper 3 through eddy current respectively with Three-phase Power Systems connection, the other end respectively and all drives the other end of fast chopper 1 to connect and compose short-circuit loop with short circuit eddy current; One end of each voltage transformer (VT) 4 and Three-phase Power Systems connection, the other end and conducting and cut-off phase controller 5 and be connected; Described conducting drives the other end of high-speed switch 3 to be connected with the other end cut-offfing phase controller 5 with each eddy current, for detecting the phase place of voltage transformer (VT) low-pressure side voltage, outputing signal controlled vortex flow when the condition is satisfied and driving the disconnection of fast chopper with closed.
Composition and the annexation of described eddy current driving fast chopper 1 are: comprise vacuum interrupter 8, insulator 9, eddy-current disc 11 and bistable mechanism 13, static contact 6 and moving contact 7 is provided with in described vacuum interrupter 8, moving contact is fixed on one end of a push rod, the centre of push rod is fixed with described eddy-current disc 11, when being provided with insulator 9 between push rod two ends, two ends insulation, the other end of push rod is fixed on described bistable mechanism 13; Before and after described eddy-current disc 11, be respectively equipped with switching winding 10 and closing coil 12(and fix with push rod); The other end that described switching winding 10 and one end of closing coil 12 connect the negative pole of trip inspection slowdown monitoring switch 14 and combined floodgate detector switch 15, switching winding 10 and closing coil 12 respectively accesses the positive pole of trip inspection slowdown monitoring switch 14 and combined floodgate detector switch 15 respectively after separating brake storage capacitor 16 and combined floodgate storage capacitor 17; Separately there is charge power supply 18, the other end that its output terminal is connected to the positive pole of described trip inspection slowdown monitoring switch 14 and combined floodgate detector switch 15, the other end is connected to described switching winding 10 and closing coil 12.
Described moving contact is fixed together by push rod and eddy-current disc, eddy-current disc knee-action, also just promotes moving contact knee-action.
Described bistable mechanism refers in isolating switch the operating mechanism keeping moving contact 7 to be in steady state (SS), and moving contact 7 remains on surface state, and with static contact 6 close contact, isolating switch is then in steady closure state, otherwise isolating switch is in stable off-state.Because switch movable contact 7 action is very fast, so bistable mechanism 13 vital role prevents moving contact 7 from knocking tripping again, i.e. so-called switch spring after static contact 6.
Its basic functional principle is:
(2-1) eddy current drives fast chopper in the stationary case, trip inspection slowdown monitoring switch, combined floodgate detector switch all disconnect, switching winding 10 and closing coil 12 all no current flow through, charge power supply 18 is charged to separating brake storage capacitor 16 and combined floodgate storage capacitor 17, makes separating brake electric capacity have the terminal voltage identical with charge power supply with combined floodgate electric capacity;
(2-2) mode that eddy current drives fast chopper to realize separating brake is: trip inspection slowdown monitoring switch 14 receives the sub-gate signal from the controller be connected with described electric power incoming line isolating switch in active distribution network, closed during sinusoidal current zero crossing in isolating switch, separating brake storage capacitor 16 and switching winding 10 form closed-loop path, separating brake storage capacitor 16 charges to switching winding 10, charging current on switching winding produces induced field, induced field induces and the induction current in the same way of the electric current on switching winding on eddy-current disc, this induction current is subject to the effect of the induced field of the charging current of switching winding, the acting force that generation one is downward on eddy-current disc, eddy-current disc is subject to this acting force and moves downward, moving contact 7 in arc chamber moves downward, distance between moving contact 7 and static contact 6 increases, arc extinction between moving contact 7 and static contact 6, realize separating brake,
(2-3) mode that eddy current drives fast chopper to realize closing a floodgate is: the switching signal that combined floodgate detector switch 15 receives from the controller be connected with described standby power supply lead-in circuit breaker in active distribution network closes.Combined floodgate storage capacitor and closing coil form closed-loop path, combined floodgate storage capacitor charges to closing coil, charging current on closing coil produces induced field, induced field induces and the induction current in the same way of the electric current on closing coil on eddy-current disc, this induction current is subject to the effect of the induced field of the charging current of closing coil, eddy-current disc produces an acting force upwards, eddy-current disc is subject to this acting force and moves upward, moving contact in arc chamber moves upward, come in contact between moving contact and static contact, realize closing a floodgate.
(3) fast chopper is driven to realize the Test to Failure device that the short circuit moment accurately controls based on eddy current, before each on-test, conducting with cut-off voltage-phase and the duration of short-circuit that phase controller presets the short circuit moment, calculate the time interval between the voltage-phase in short circuit moment and voltage waveform zero crossing.Conducting with cut-off phase controller and be built-in with voltage-phase zero crossing detection device, by after the zero crossing that detects voltage transformer (VT) low-pressure side voltage through exporting energization control signal, controlled vortex flow drives the combined floodgate detector switch of fast chopper to make its quick-make, behind elapsed time interval, conducting with cut-off phase controller and export separating brake control signal, controlled vortex flow drives the trip inspection slowdown monitoring switch of fast chopper to make it disconnect fast, namely completes a controllable voltage phase angle short-circuit fault test.
(4) vacuum contactor is mainly through selectively disconnecting with closed, eddy current is coordinated to drive fast chopper, different short trouble is realized, as single-phase grounding fault, two-phase phase fault, two-phase short circuit and ground fault and three phase short circuit fault etc. for this short-circuit fault test device.
(4-1) single-phase grounding fault test is carried out for A phase short circuit grounding, the vacuum contactor connecting A, B, C phase starts all to be in off-state, closed A phase vacuum contactor, then by conducting with cut-off phase controller and export conductivity control signal in the conduction phase moment, make the eddy current be connected on A, B, C three-phase and center line drive high-speed switch quick-make, realize the single-phase grounding fault test of this phase time.
(4-2) test of two-phase phase fault is carried out for A, B line to line fault, the vacuum contactor connecting A, B, C phase starts all to be in off-state, closed A, B two-phase vacuum contactor, then by conducting with cut-off phase controller and export conductivity control signal in the conduction phase moment, make the eddy current being connected to A, B, C three-phase drive high-speed switch quick-make, realize the two-phase phase fault test of this phase time.
(4-3) two-phase short circuit and ground fault test is carried out for A, B two-phase grounding fault, the vacuum contactor connecting A, B, C phase starts all to be in off-state, closed A, B two-phase vacuum contactor, then by conducting with cut-off phase controller and export conductivity control signal in the conduction phase moment, make the eddy current be connected on A, B, C three-phase and center line drive high-speed switch quick-make, realize the two-phase short circuit and ground fault test of this phase time.
(4-4) three phase short circuit fault test is carried out for A, B, C three-phase shortcircuit, the vacuum contactor connecting A, B, C phase starts all to be in off-state, closed A, B, C three-phase vacuum contactor, then by conducting with cut-off phase controller and export conductivity control signal in the conduction phase moment, make the eddy current being connected to A, B, C three-phase drive high-speed switch quick-make, realize the three phase short circuit fault test of this phase time.
Beneficial effect: what the present invention proposed drives fast chopper to realize the Test to Failure device that the short circuit moment accurately controls based on eddy current, its advantage is: the Fast Speed Vacuum Circuit Breaker that make use of Quick eddy Driving technique, the core component of apparatus for fast switching is driven as eddy current, compared with traditional isolating switch, this isolating switch utilizes electromagnetic force to perform the divide-shut brake of isolating switch, there is responsiveness faster, sub-switching operation can be realized in 5ms, closing operation is realized in 10m, while there is the responsiveness compared favourably with the solid-state switch of Power Electronic Technique, also solid-state switch is better than in cost and reliability, and dispersed little, be less than 0.2ms by the dispersiveness of experimental test.Thus, based on eddy current drive the short-circuit fault test device of fast chopper to realize short-circuit fault test that the short circuit moment accurately controls.
Accompanying drawing explanation
Fig. 1 is the major equipment wiring schematic diagram related to based on eddy current drive fast chopper to realize Test to Failure device that the short circuit moment accurately controls of the present invention;
Fig. 2 is the structural representation that the eddy current related to based on eddy current drive fast chopper to realize Test to Failure device that the short circuit moment accurately controls that the present invention proposes drives fast chopper.
Fig. 3-1 be the C phase single-line to ground fault of the short-circuit current cutting-off process schematic diagram in the different voltage-phase moment related to based on eddy current drive fast chopper to realize Test to Failure device that the short circuit moment accurately controls that the present invention proposes and its voltage-phase is 34.2 degree time electric power incoming line line current waveform;
Fig. 3-2 be C phase single-line to ground fault and its voltage-phase is 189 degree time same electric power incoming line line current waveform.
In figure, 1 is that eddy current drives fast chopper, and 2 is vacuum contactors, and 3 is that eddy current drives fast chopper, 4 is voltage transformer (VT), and 5 is conductings and cut-off phase controller, and 6 is static contacts, 7 is moving contacts, and 8 is vacuum interrupters, and 9 is insulators, 10 is switching windings, and 11 is eddy-current discs, and 12 is closing coils, 13 is bistable mechanisms, and 14 is trip inspection slowdown monitoring switch, and 15 is combined floodgate detector switches, 16 is separating brake storage capacitors, and 17 is combined floodgate storage capacitors, and 18 is charge power supplies.
Embodiment
See Fig. 1 and Fig. 2, the short-circuit fault of power system test unit embodiment that accurately can control the short circuit moment of the present invention, comprises a short circuit eddy current and drives fast chopper 1, three vacuum contactors 2, three eddy current drive fast chopper 3, three voltage transformer (VT) 4 and a conducting and cut-off phase controller 5.
Short circuit eddy current drives fast chopper 1 one terminate ground wire, and one end of each vacuum contactor 2 drives after fast chopper 3 through eddy current respectively with Three-phase Power Systems connection, the other end respectively and all drives the other end of fast chopper 1 to connect and compose short-circuit loop with short circuit eddy current; One end of each voltage transformer (VT) 4 and Three-phase Power Systems connection, the other end and conducting and cut-off phase controller 5 and be connected; Described conducting drives the other end of high-speed switch 3 to be connected with the other end cut-offfing phase controller 5 with each eddy current, for detecting the phase place of voltage transformer (VT) low-pressure side voltage, outputing signal controlled vortex flow when the condition is satisfied and driving the disconnection of fast chopper with closed.
Composition and the annexation of eddy current driving fast chopper 1 are: comprise vacuum interrupter 8, insulator 9, eddy-current disc 11 and bistable mechanism 13, static contact 6 and moving contact 7 is provided with in described vacuum interrupter 8, moving contact is fixed on one end of a push rod, the centre of push rod is fixed with described eddy-current disc 11, when being provided with insulator 9 between push rod two ends, two ends insulation, the other end of push rod is fixed on described bistable mechanism 13; Before and after described eddy-current disc 11, be respectively equipped with switching winding 10 and closing coil 12(and fix with push rod); The other end that described switching winding 10 and one end of closing coil 12 connect the negative pole (electric current is all conducting from right to left) of trip inspection slowdown monitoring switch 14 and combined floodgate detector switch 15, switching winding 10 and closing coil 12 respectively accesses the positive pole of trip inspection slowdown monitoring switch 14 and combined floodgate detector switch 15 respectively after separating brake storage capacitor 16 and combined floodgate storage capacitor 17; Separately there is charge power supply 18, the other end (connect separating brake storage capacitor 16 and combined floodgate storage capacitor 17 end, also namely one end of switching winding 10 and closing coil 12 is directly connected) that its output terminal is connected to the positive pole of described trip inspection slowdown monitoring switch 14 and combined floodgate detector switch 15, the other end is connected to described switching winding 10 and closing coil 12.So, moving contact is fixed together by push rod and eddy-current disc, eddy-current disc knee-action, also just promotes moving contact knee-action.
Bistable mechanism refers in isolating switch the operating mechanism keeping moving contact 7 to be in steady state (SS), and moving contact 7 remains on surface state, and with static contact 6 close contact, isolating switch is then in steady closure state, otherwise isolating switch is in stable off-state.Because switch movable contact 7 action is very fast, so bistable mechanism 13 vital role prevents moving contact 7 from knocking tripping again, i.e. so-called switch spring after static contact 6.
Major equipment and function as follows:
(1) drive fast chopper to realize the Test to Failure device that the short circuit moment accurately controls based on eddy current mainly to comprise: vacuum contactor, eddy current drive fast chopper, voltage transformer (VT), conducting and cut-off the major equipments such as phase controller and form.
Wherein: vacuum contactor one end is connected with power circuit, the other end and eddy current drive fast chopper to be connected, and can form short-circuit loop; Voltage transformer (VT) one end is connected with power circuit, the other end and conducting with cut-off phase controller and be connected; Conducting drives the other end of high-speed switch to be connected with the other end cut-offfing phase controller with eddy current, for detecting the phase place of voltage transformer (VT) low-pressure side voltage, outputing signal controlled vortex flow when the condition is satisfied and driving the disconnection of fast chopper with closed.As shown in Figure 1, wherein, 1 is that eddy current drives fast chopper, and 2 is vacuum contactors, and 3 is that eddy current drives fast chopper, and 4 is voltage transformer (VT) in the concrete wiring of major equipment, and 5 is conductings and cut-off phase controller.
The eddy current used in the inventive method drives fast chopper, and can be produced by Shanghai HeKai Electric power Protection equipment Co., Ltd, product type is SHK-MS high-speed circuit breaker.
Claims (2)
1. accurately can control the short-circuit fault of power system test unit in short circuit moment, it is characterized in that: comprise a short circuit eddy current and drive fast chopper (1), three vacuum contactors (2), three eddy current driving fast chopper (3), three voltage transformer (VT) (4) and conductings and cut-off phase controller (5);
Described short circuit eddy current drives fast chopper (1) terminate ground wire, and one end of each vacuum contactor (2) drives after fast chopper (3) through eddy current respectively with Three-phase Power Systems connection, the other end respectively and all drives with short circuit eddy current the other end of fast chopper (1) to connect and compose short-circuit loop; One end of each voltage transformer (VT) (4) and Three-phase Power Systems connection, the other end and conducting and cut-off phase controller (5) and be connected; Described conducting drives the control end of high-speed switch (3) to be connected with the other end cut-offfing phase controller (5) with each eddy current, for detecting the phase place of voltage transformer (VT) low-pressure side voltage, outputing signal controlled vortex flow when the condition is satisfied and driving the disconnection of fast chopper with closed.
2. the short-circuit fault of power system test unit that accurately can control the short circuit moment according to claim 1, it is characterized in that: described eddy current drives the composition of fast chopper (1) to comprise vacuum interrupter (8), insulator (9), eddy-current disc (11) and bistable mechanism (13), static contact (6) and moving contact (7) is provided with in described vacuum interrupter (8), moving contact is fixed on one end of a push rod, the centre of push rod is fixed with described eddy-current disc (11), the other end of push rod is fixed on described bistable mechanism (13), two ends insulation when being provided with insulator (9) between push rod two ends, before and after described eddy-current disc (11), be respectively equipped with switching winding (10) and closing coil (12), the other end that described switching winding (10) and one end of closing coil (12) connect the negative pole of trip inspection slowdown monitoring switch (14) and combined floodgate detector switch (15), switching winding (10) and closing coil (12) respectively accesses the positive pole of trip inspection slowdown monitoring switch (14) and combined floodgate detector switch (15) respectively after separating brake storage capacitor (16) and combined floodgate storage capacitor (17), separately there is charge power supply (18), the other end that its output terminal is connected to the positive pole of described trip inspection slowdown monitoring switch (14) and combined floodgate detector switch (15), the other end is connected to described switching winding (10) and closing coil (12).
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| CN107276042A (en) * | 2017-08-02 | 2017-10-20 | 国家电网公司 | Shutting-brake control method based on one or two fusion no-flashy-flow Intelligent power distribution switchs |
| CN107317300A (en) * | 2017-08-02 | 2017-11-03 | 国家电网公司 | Intelligent auto recloser |
| CN109507508A (en) * | 2018-11-21 | 2019-03-22 | 上海诚佳电子科技有限公司 | A kind of circuit and method controlling short dot phase and duration |
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| CN107276042A (en) * | 2017-08-02 | 2017-10-20 | 国家电网公司 | Shutting-brake control method based on one or two fusion no-flashy-flow Intelligent power distribution switchs |
| CN107317300A (en) * | 2017-08-02 | 2017-11-03 | 国家电网公司 | Intelligent auto recloser |
| CN109507508A (en) * | 2018-11-21 | 2019-03-22 | 上海诚佳电子科技有限公司 | A kind of circuit and method controlling short dot phase and duration |
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| CN112271693B (en) * | 2020-09-18 | 2022-12-02 | 国网宁夏电力有限公司电力科学研究院 | Power frequency first half-wave fault current generation method and transient dynamic stability detection method |
| CN113359019A (en) * | 2021-04-27 | 2021-09-07 | 西安交通大学 | High-voltage alternating-current on-off test system based on signal generator triggering |
| CN113777524A (en) * | 2021-08-17 | 2021-12-10 | 安徽合凯电气科技股份有限公司 | Short circuit test device with three-phase current containing direct-current component |
| CN113777524B (en) * | 2021-08-17 | 2024-01-12 | 安徽合凯电气科技股份有限公司 | Short circuit test device for three-phase current containing direct current component |
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| CN104569725B (en) | 2018-04-17 |
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