CN203800587U - Small grounding current system arc-suppression, overvoltage and electrification protection device - Google Patents
Small grounding current system arc-suppression, overvoltage and electrification protection device Download PDFInfo
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- CN203800587U CN203800587U CN201420109162.4U CN201420109162U CN203800587U CN 203800587 U CN203800587 U CN 203800587U CN 201420109162 U CN201420109162 U CN 201420109162U CN 203800587 U CN203800587 U CN 203800587U
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Abstract
The utility model relates to a small grounding current system arc-suppression, overvoltage and electrification protection device, which is characterized in that one end of the device is connected with a substation busbar through a split-phase circuit breaker, the other end is connected with a ground network through a reactor type transformer, and on-off of the split-phase circuit breaker is controlled by a single-phase grounding protection control unit through controlling a driving unit; the reactor type transformer is composed of a primary coil, a reactor type transformer auxiliary secondary coil and a reactor type transformer main secondary coil, one end of the primary coil is connected with the split-phase circuit breaker, and the other end is connected with the ground network; the reactor type transformer auxiliary secondary coil is connected with the input end of the single-phase grounding protection control unit and used for measuring signals; and the reactor type transformer main secondary coil is connected with a high-frequency signal power supply through a single-phase switch and used for coupling high-frequency signals, and the single-phase switch is controlled by the single-phase grounding protection control unit through controlling the driving unit. The small grounding current system arc-suppression, overvoltage and electrification protection device changes the system grounding mode, and realizes protection for human body electrification; and positioning is carried out on a fault point, and the device resets automatically after the fault disappears.
Description
Technical field
The utility model belongs to converting station electric power facility field, relate in particular to a kind of for the not converting station electric power facility of solidly grounded system of neutral point, the device that human body and equipment are protected.
Background technology
In electric power system at present, continuing to use the compensation technique of arc suppression coil always, this technology is subject to entirely to compensate the restriction of resonance overvoltage, and fault point still has residual flow and residual arc, particularly in the time that the earth current of system is very large, because residual flow increases thereupon, can make arc suppression coil ineffective.Fault-Locating Test is only applicable to power down mode or to using under earth fault unprotect state.In the location technology of fault phase being carried out in effective protection situation, in space state.
The problem existing in existing technology is as follows: single phase ground fault extinguishing arc technology: the compensation technique of always continuing to use arc suppression coil, this technology is subject to entirely to compensate the restriction of resonance overvoltage, fault point still has residual flow and residual arc, particularly in the time that the earth current of system is very large, because residual flow increases thereupon, can make arc suppression coil ineffective.
Human body electrification resist technology: only have earth leakage protective device in 380V/220V electric power system, but there is no this type of protective device at the small grounding current system of 3.3KV～66KV high voltage supply.
Ground connection phase selection technology: the phase selection device of collection metal, high resistant, inductive element and intermittent ground connection is in space state.
Route selection technology: the line-selected earthing device of input coefficient operation is at present a lot, but because factors such as being subject to ground connection degree and Arc Suppression Coil Compensation Degree affects, route selection precision is not high.Intermittent grounding surge resist technology: in space state.
Fault-Locating Test: at present Fault-Locating Test is only applicable to power down mode or to using under earth fault unprotect state.In the location technology of fault phase being carried out in effective protection situation, in space state.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of potential safety hazard that electrical network is caused that reduced, can fault status, and the small grounding current system extinguishing arc overvoltage electrification protective device of automatic homing.
The utility model is to realize like this, a kind of small grounding current system extinguishing arc overvoltage electrification protective device, it is characterized in that, this device comprises phase-splitting circuit breaker, reactance transformer, unidirectional ground protection control unit, driver element, data acquisition unit and by-pass switch;
Phase-splitting circuit breaker one end is connected with substation bus bar, and the other end is connected with earth mat through reactance transformer, and the normal motion time phase of system circuit breaker is in gate-dividing state, and phase-splitting circuit breaker passes through to control driver element control divide-shut brake by unidirectional ground protection control unit;
Reactance transformer, by primary winding, the main secondary coil composition of the secondary secondary coil of reactance transformer and reactance transformer, primary winding one end is connected with phase-splitting circuit breaker, and the other end is connected with earth mat; The secondary secondary coil of reactance transformer, is connected with the input of one-phase ground protection control unit, for signal measurement; The main secondary coil of reactance transformer, is connected with a high-frequency signal power supply by a single-phase switch, and for couples high frequency signals, single-phase switch passes through to control driver element control by unidirectional ground protection control unit;
The input connection data collecting unit of unidirectional ground protection control unit, data acquisition unit is for being connected the electric power signal that gathers electrical network with electrical network.
Further, this device also comprises hand-hold type signal receiver, injects particular frequencies current signal failure judgement point by accepting high-frequency signal power supply to network system.
Further; the primary circuit of reactance transformer is parallel with the shunt circuit of a by-pass switch composition; it is "on" position that system is normally played by-pass switch; between the primary winding of reactance transformer and earth mat, be provided with zero sequence current mutual inductor; the output of zero sequence current mutual inductor is connected with unidirectional ground protection control unit, and unidirectional ground protection control unit is controlled by-pass switch by the signal of accepting.
The utility model compared with prior art, beneficial effect is: the utility model is to change system earth mode, becoming transfer current extinguishing arc method from arc suppression coil compensation electric current extinguishing arc method is in the past starting point, adopts and forces fault phase and the earth equipotential technology to solve human body electrification unprotect problem; Adopt reactance transformer signal injection technology to solve and fault phase is being carried out in effective protection situation, the problem that cannot locate fault point; Adopt fault phase high frequency earthing impedance measurement technique, solve the problem of fault disappearance device automatic resetting.Except joint money, energy-saving efficiency, also there is the defencive function that the person is got an electric shock, to the defencive function of intermittent grounding surge, earth point is carried out without stream, without the defencive function of arc.Can greatly improve the safety operation level of small current neutral grounding system.
Brief description of the drawings
Fig. 1 is the electrical block diagram that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, a kind of small grounding current system extinguishing arc overvoltage electrification protective device, this device comprises phase-splitting circuit breaker 2, reactance transformer 3, unidirectional ground protection control unit 1, driver element, data acquisition unit and by-pass switch K4;
Phase-splitting circuit breaker 2 one end are connected with substation bus bar, the other end is connected with earth mat 6 through reactance transformer 3, the normal motion time phase of system circuit breaker 2 is in gate-dividing state, and phase-splitting circuit breaker 2 passes through to control driver element control divide-shut brake by unidirectional ground protection control unit 1; Be one fault phase and the earth to be forced to equipotential executive component, and be provided with each other electric and program locking, only allow in any case a phase breaker closing.
Reactance transformer 3, by primary winding W1, the main secondary coil W3 composition of the secondary secondary coil W2 of reactance transformer and reactance transformer, primary winding W1 one end is connected with phase-splitting circuit breaker 2, and the other end is connected with earth mat 6; The secondary secondary coil W2 of reactance transformer, is connected with the input of one-phase ground protection control unit 1, for signal measurement; The main secondary coil W3 of reactance transformer, is connected with a high-frequency signal power supply 4 by a single-phase switch, and for couples high frequency signals, single-phase switch passes through to control driver element control by unidirectional ground protection control unit; Reactance transformer 3 adopts the equipment of dual frequency power supplies work, is a reactor in the time of power frequency, and impedance is less than 1 Europe, is mainly used in blow-out and overvoltage protection; In the time of high frequency, be a transformer, be mainly used in, in the situation that assurance device is carried out effectively protection to fault phase, injecting high frequency voltage to fault phase.
Unidirectional ground protection control unit 1 is control core part, its input connection data collecting unit, and data acquisition unit is for being connected the electric power signal that gathers electrical network with electrical network.This device also comprises hand-hold type signal receiver 7, can detect the particular frequencies signal of high-frequency signal power supply injected system, carries out line inspection for operating personnel, and fault is positioned.Inject particular frequencies current signal failure judgement point by accepting high-frequency signal power supply to network system.
In the present embodiment; the primary circuit of reactance transformer is parallel with the shunt circuit of a by-pass switch K4 composition; it is "on" position that system is normally played by-pass switch; between the primary winding of reactance transformer and earth mat, be provided with zero sequence current mutual inductor 5; the output of zero sequence current mutual inductor 5 is connected with unidirectional ground protection control unit, and unidirectional ground protection control unit is controlled by-pass switch by the signal of accepting.
In the present embodiment, operational mode is:
One-phase ground protection control unit is by data acquisition unit Real-time Collection substation busbars phase, line voltage, residual voltage; according to the modular angle of residual voltage and line voltage change judgement system have or not single phase ground fault and ground connection separate; in the time there is single phase ground fault; control corresponding separate circuit breaker (K1, K2, K3) rapid closing in 50ms; after corresponding separate breaker closing; force fault phase equipotential over the ground; realize human body electrification protection; ground arc is extinguished in realization; provide effective protection to human body electrification simultaneously, avoid personal injury accident to occur.In the time that ground property is intermittent ground connection, this device can change unstable state ground connection into stable metal ground connection, avoids intermittent superpotential generation.
One-phase ground protection control unit is recorded ripple before and after the action of phase-splitting circuit breaker, and the variation according to each circuit zero-sequence current before and after phase-splitting breaker closing adopts ground connection transfer characteristic equation, determines earth fault line.
After phase-splitting breaker closing, through setting-up time time delay, one-phase ground protection control unit control by-pass switch K4 zero passage separating brake, device enters the second protection channel, start high-frequency signal power supply simultaneously, inject particular frequencies high frequency voltage by the main secondary coil W3 of reactance transformer being connected with signal power source to system, produce high frequency earthing electric current, one-phase ground protection control unit gathers voltage and the current signal of the secondary secondary coil W2 feedback of reactance transformer, isolate the particular frequencies high-frequency signal wherein injecting, computing system impedance ground changes, as impedance ground returns to system normal condition, differentiating earth fault disappears, one-phase ground protection control unit control phase-splitting circuit breaker 2 separating brakes, realize single phase ground fault automatic resetting.
As earth fault fails to recover for a long time, operator holds the fault loop that hand-hold type signal receiver selects along earthing wire-selecting unit and makes an inspection tour, looking up the fault point, and hand-hold type signal receiver shows and receives signal when dying down by force, be fault point, complete single phase ground fault location.
In the time of system generation single phase ground fault, system equivalent electric circuit is system capacitive reactance Xc and earth resistance 3Rj composition shunt circuit, wherein U0 is system equivalence voltage to earth, Xc is system capacitance to earth, it is a constant, can be shifted by ground connection time, (when phase-splitting circuit breaker K1, K2, K3 closure), is obtained by Xc=3U0/Ij.
One-phase ground protection controller starts high-frequency signal power supply; by signal power source by the main secondary coil W3 of reactance transformer being connected with it; inject an electric current to system; it forms loop along the parallel circuits of system capacitance to earth-jXc and fault loop impedance Rj composition this electric current I s; and producing a voltage U s at reactance transformer primary winding W1 two ends, this voltage can obtain through the secondary secondary coil W2 of reactance transformer.By the high-frequency signal electric current I s of single-phase earthing control unit collection feedback and the value of voltage U s, and can obtain and flow into the electric current I j of fault loop by loop current equation, according to the both end voltage Us of fault loop and the electric current I j flowing through, obtain the impedance of fault loop afterwards.The real part of separating this equation is the value of earth resistance Rj.
One-phase ground protection control unit is according to the grounding resistance calculating; judge whether earth fault disappears; when system earth impedance returns to normal level, phase-splitting ground protection control unit control phase-splitting circuit breaker 2 separating brakes, realize single phase earthing protection automatic resetting.
Single phase ground fault position fixing process:
In the time of system generation single phase ground fault; one-phase ground protection control unit control phase-splitting circuit breaker 2 closes a floodgate; after setting-up time time delay; start high-frequency signal power supply and inject particular frequencies current signal by the main secondary coil W3 of reactance transformer to system, this electric current is coupled into system through reactance transformer primary winding W1.Now reactance transformer 3, combined floodgate phase phase-splitting circuit breaker 2, bus, grounded circuit earth point form loop by the earth, and Injection Signal electric current is only along this loop flow.And Injection Signal electric current is present in before bus and line single phase grounding failure point, and after earth fault, circuit exists without this electric current.
Operating personnel hold the ground path that hand-hold type signal receiver is selected along one-phase ground protection control unit, make an inspection tour, and judge earth point position according to the signal numerical value change showing.When signal is by dying down by force, be earth point position, thereby realize fault location.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. a small grounding current system extinguishing arc overvoltage electrification protective device, is characterized in that, this device comprises phase-splitting circuit breaker, reactance transformer, unidirectional ground protection control unit, driver element, data acquisition unit and by-pass switch;
Phase-splitting circuit breaker one end is connected with substation bus bar, and the other end is connected with earth mat through reactance transformer, and the normal motion time phase of system circuit breaker is in gate-dividing state, and phase-splitting circuit breaker passes through to control driver element control divide-shut brake by unidirectional ground protection control unit;
Reactance transformer, by primary winding, the main secondary coil composition of the secondary secondary coil of reactance transformer and reactance transformer, primary winding one end is connected with phase-splitting circuit breaker, and the other end is connected with earth mat; The secondary secondary coil of reactance transformer, is connected with the input of one-phase ground protection control unit, for signal measurement; The main secondary coil of reactance transformer, is connected with a high-frequency signal power supply by a single-phase switch, and for couples high frequency signals, single-phase switch passes through to control driver element control by unidirectional ground protection control unit;
The input connection data collecting unit of unidirectional ground protection control unit, data acquisition unit is for being connected the electric power signal that gathers electrical network with electrical network.
2. small grounding current system extinguishing arc overvoltage electrification protective device as claimed in claim 1, is characterized in that, this device also comprises hand-hold type signal receiver, injects particular frequencies current signal failure judgement point by accepting high-frequency signal power supply to network system.
3. small grounding current system extinguishing arc overvoltage electrification protective device as claimed in claim 1; it is characterized in that; the primary circuit of reactance transformer is parallel with the shunt circuit of a by-pass switch composition; it is "on" position that system is normally played by-pass switch; between the primary winding of reactance transformer and earth mat, be provided with zero sequence current mutual inductor; the output of zero sequence current mutual inductor is connected with unidirectional ground protection control unit, and unidirectional ground protection control unit is controlled by-pass switch by the signal of accepting.
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| CN201420109162.4U CN203800587U (en) | 2014-03-11 | 2014-03-11 | Small grounding current system arc-suppression, overvoltage and electrification protection device |
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| CN201420109162.4U CN203800587U (en) | 2014-03-11 | 2014-03-11 | Small grounding current system arc-suppression, overvoltage and electrification protection device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485212A (en) * | 2014-11-28 | 2015-04-01 | 辽宁拓新电力电子有限公司 | Low-excitation-impedance single-phase transformer |
| CN105159378A (en) * | 2015-08-06 | 2015-12-16 | 保定上为电气科技有限公司 | Fault line selection auxiliary signal control system and control method for same |
| CN105703349A (en) * | 2014-11-28 | 2016-06-22 | 辽宁拓新电力电子有限公司 | Low excitation impedance transformer single-phase grounding protection device and protection method |
| CN106026053A (en) * | 2016-08-02 | 2016-10-12 | 辽宁拓新电力电子有限公司 | Single phase earth fault positioning and isolating system and method based on low-excitation impedance transformer |
| CN106405306A (en) * | 2016-08-02 | 2017-02-15 | 辽宁拓新电力电子有限公司 | Low excitation impedance transformer grounding protection apparatus and method thereof |
| CN112462194A (en) * | 2020-11-09 | 2021-03-09 | 国网山东省电力公司东平县供电公司 | Fault finding device and method for distribution line |
-
2014
- 2014-03-11 CN CN201420109162.4U patent/CN203800587U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485212A (en) * | 2014-11-28 | 2015-04-01 | 辽宁拓新电力电子有限公司 | Low-excitation-impedance single-phase transformer |
| CN105703349A (en) * | 2014-11-28 | 2016-06-22 | 辽宁拓新电力电子有限公司 | Low excitation impedance transformer single-phase grounding protection device and protection method |
| CN105159378A (en) * | 2015-08-06 | 2015-12-16 | 保定上为电气科技有限公司 | Fault line selection auxiliary signal control system and control method for same |
| CN106026053A (en) * | 2016-08-02 | 2016-10-12 | 辽宁拓新电力电子有限公司 | Single phase earth fault positioning and isolating system and method based on low-excitation impedance transformer |
| CN106405306A (en) * | 2016-08-02 | 2017-02-15 | 辽宁拓新电力电子有限公司 | Low excitation impedance transformer grounding protection apparatus and method thereof |
| CN112462194A (en) * | 2020-11-09 | 2021-03-09 | 国网山东省电力公司东平县供电公司 | Fault finding device and method for distribution line |
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Address after: 110003, No. 81, eleven weft Road, Heping District, Liaoning, Shenyang Patentee after: SHENYANG ELECTRIC POWER SURVEY & DESIGN INSTITUTE CO.,LTD. Address before: 110003, No. 81, eleven weft Road, Heping District, Liaoning, Shenyang Patentee before: Shenyang Electric Power Survey Design Institute |
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Granted publication date: 20140827 |
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