CN107611958A - Automatic tracking and compensating arc distinction system for generator neutral point - Google Patents
Automatic tracking and compensating arc distinction system for generator neutral point Download PDFInfo
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- CN107611958A CN107611958A CN201710687635.7A CN201710687635A CN107611958A CN 107611958 A CN107611958 A CN 107611958A CN 201710687635 A CN201710687635 A CN 201710687635A CN 107611958 A CN107611958 A CN 107611958A
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Abstract
The invention provides a kind of automatic tracking and compensating arc distinction system for generator neutral point, it is characterized in that, including arc suppression coil module and core controller, core controller is connected with arc suppression coil module, Tuning Control and operational monitoring for arc suppression coil module；Wherein：Arc suppression coil module includes：Arc suppression coil, load ratio bridging switch, secondary winding, thyristor switch and damping resistance, secondary winding is wound on the iron core of arc suppression coil, secondary winding is connected in parallel through thyristor switch and damping resistance, load ratio bridging switch is arranged at the primary side of arc suppression coil, for picking out one or more joints in the primary side of arc suppression coil.The present invention can be achieved to optimize multicomputer or the automatic tracking and compensating of the monitoring of more parent segment paired runnings and arc suppression coil, avoid major safety risks existing for existing product, ratio of damping is invariable, all the time in optimal damping effect, the defects of avoiding damping unstable.
Description
Technical field
The present invention relates to the neutral ground extinguishing arc automatic compensatory technique field of power system, in particular it relates to which a kind of use
In the automatic tracking and compensating arc distinction system of generator neutral point.
Background technology
The problem of neutral grounding mode is one extremely complex, to consider each side of Operation of Electric Systems and control
What kind of method of operation face, a power network take to be determined on a case-by-case basis, but it is unquestionable to have a bit, and neutral point is through disappearing
Arc coil earthing mode has been proved its significant superiority, especially to consider that safety problem and higher power supply can to some
It is even more important by the application scenario of property, neutral by arc extinction coil grounding.The limiting capacitance electricity from the perspective of earthing mode
The problem of stream, neutral by arc extinction coil grounding are exactly unique selection.
The compensation effect of arc suppression coil has much relations with its tuning-off degree, tunes appropriate arc suppression coil and can be only achieved ideal
Effect, and power network will change, and so as to which its unbalanced earth fault capacitance current changes therewith, this just needs people according to electricity
Net changes to adjust the compensation electric current of arc suppression coil.This work is not only cumbersome, and is difficult manually in many instances
Timely and accurately tuning peterson coil, it is achieved that the automatic tuning of arc suppression coil is very important.This needs solve two
Problem, first, to have an automatic adjustable arc, second, to there is one to realize the control system accurately tuned.Exist in addition
After singlephase earth fault occurs for power network, how earth fault is quickly and accurately searched, cut off faulty line in time and recovering power network just
Often operation is very important that this is also one of problem of long-term puzzled small current neutral grounding system.
Neutral point installation arc suppression coil is one of effective ways for administering zero-sequence fault, can control ground connection residual flow, effectively suppression
Arc overvoltage and ferro-resonance over-voltage processed etc. endanger.
Turn-adjusting arc-extinguishing system is to run most reliable in existing all kinds of extinguishing arc products, and its structure design is simple,
Advantage of lower cost, therefore turn-adjusting arc-extinguishing system turns into the main product of extinguishing arc industry.Turn-adjusting arc-extinguishing system belongs to pre- benefit
Arc-extinguishing system is repaid, series resonance occurs between the power-to-ground capacitance and arc suppression coil during in order to prevent normal operation, it is necessary to connect
Enter damping resistance to be suppressed.Traditional turn-adjusting arc-extinguishing system is pressed down by the way of damping resistance to be serially connected in primary side
Series resonance processed, i.e., using the method directly connected with arc suppression coil, abbreviation high-pressure series method, so occur that following two are asked
Topic：
1st, during series damping resistor, because resistance is constant, with the change of arc suppression coil work tap, ratio of damping
Change therewith, damping is unstable；
2nd, damping resistance is placed on high-pressure side (primary side), is grounded and is grounded in the transient state transfer process to disappear in power network, resistance
Buffer resistance bears overvoltage and overcurrent, it is desirable to which the major insulation and turn-to-turn insulation of damping resistance should have certain intensity and enough
Thermal capacity, manufacturing process is careless slightly, may cause to damage, therefore the protection relative difficulty to damping resistance is easily burnt out.
Currently without the explanation or report for finding technology similar to the present invention, money similar both at home and abroad is also not yet collected into
Material.
The content of the invention
The present invention is for above shortcomings in the prior art, there is provided it is a kind of for generator neutral point it is automatic with
Track compensation arc-extinguishing system.
The present invention is achieved by the following technical solutions.
A kind of automatic tracking and compensating arc distinction system for generator neutral point, including arc suppression coil module and core control
Device, the core controller are connected with arc suppression coil module, and Tuning Control and the operation for arc suppression coil module are supervised
Survey；Wherein：
The arc suppression coil module includes：Arc suppression coil, load ratio bridging switch, secondary winding, thyristor switch and resistance
Buffer resistance, the secondary winding are wound on the iron core of arc suppression coil, and the secondary winding is through thyristor switch and damping resistance
It is connected in parallel, the load ratio bridging switch is arranged at the primary side of arc suppression coil, for being carried out to the multiple taps of arc suppression coil
Loaded tap-off switches.
Preferably, the arc suppression coil is turn-adjusting arc-extinguishing winding.
Preferably, under full compensating coefficient, the damping resistance is constant to the ratio of damping of power network.
Preferably, the resistance of the damping resistance is determined by any grade of number of turn of arc suppression coil.
Preferably, the arc suppression coil module also includes damping resistance case, and the damping resistance is arranged at damping resistance case
It is interior.
Preferably, it is characterised in that the core controller includes monitoring host computer and arc-suppressing controller, the monitoring host computer
Including CAN interface, the monitoring host computer is communicated to connect by CAN interface and arc-suppressing controller；Wherein：
The monitoring host computer also include it is following any one or appoint multiple interfaces：
- USB interface, for exporting the electric network data of arc-suppressing controller collection；
- display module interface, for accessing display unit, there is provided human-computer interaction interface；
- printer interface, for accessing printer unit；
- serial communication interface, for accessing complex automatic system；
The arc-suppressing controller includes following module：
- parent segment plate module, for tracking measurement electric network capacitance and current changing value；
- extinguishing arc drives plate module, for being pre-adjusted arc suppression coil module inductance；
- remote signalling is remotely controlled plate module, and arc suppression coil module is controlled for automatic follow-up tuning；
- route selection plate module, for carrying out route selection to the fault branch in power network.
Preferably, the serial communication interface includes RS232, RS422 and/or RS458 serial line interface.
Preferably, the arc-suppressing controller is by sampling neutral point voltage signal, the capacitance current detection to power network, according to
The capacitance current detection sensitivity of setting, sampling neutral point magnitude of voltage U0, according to U0Variable quantity decides whether to detect electric capacity electricity again
Stream；Wait earth fault；
After singlephase earth fault occurs, arc-suppressing controller excision damping resistance, arc suppression coil module enters full compensation shape
State；For permanent earth, input is connected to the middle resistance 1s of arc suppression coil, to each branch road zero in power network before and after resistance in input
Sequence electric current and residual voltage carry out data acquisition, and carry out route selection to the fault branch in power network by route selection plate module；Extinguishing arc
Controller is judged electric network state comprehensively, and in the case of it is determined that failure safe disappears, is put into damping resistance, returned again
Return to and state is detected to the capacitance current of power network, meanwhile, arc-suppressing controller exists to the neutral point voltage and neutral point current of power network
Each 10 cycles before and after ground connection initial time, each 10 cycles carry out data recording before and after being grounded finish time.
Preferably, the principle that decides whether to detect capacitance current again according to U0 magnitude of voltage variable quantities is：Work as U0Greatly
When starting voltage corresponding to the capacitance current detection sensitivity in setting, capacitance current is detected again.
Preferably, the arc-suppressing controller is disappeared by the serial communication interface of monitoring host computer to complex automatic system transmission
Arc coil module normal operating condition information and ground state information.
Compared with prior art, the present invention has following beneficial effect：
1st, real-time, the present invention are handled and diagnosed in real time to sampled data, and using multithreading, control in real time is transported
The row time.
2nd, validity, the present invention can efficient diagnosis shelf depreciation, due to local discharge signal detection by it is a variety of because
Element influences and uncertainty is presented, thus it is of the invention in shelf depreciation theoretical foundation, by intelligent diagnosing method, in power network
Fault branch judged.
3rd, modularized design, the present invention use modularized design, make clear in structure, and each several part is relatively independent and easily coordinates,
It is simple in construction to be easily achieved.
4th, scalability, the present invention meet the needs of varying environment, expand the suitable of system by designing different interfaces
With scope and service life.
5th, user interface is friendly, and the present invention can flexibly set different parameters, simple system side according to specific circumstances
Easy maintenance.
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is the arc suppression coil modular structure schematic diagram exemplified by adjusting circle arc suppression coil, wherein, (a) is damping resistance rz
Access infrastructure schematic diagram, (b) be the i-th tap work when high-pressure side (secondary side) schematic equivalent circuit；
Fig. 2 is the hardware block diagram of core controller；
Fig. 3 is arc-suppressing controller workflow diagram；
Fig. 4 is single-phase earthing start time neutral point voltage, current recording waveform；
Fig. 5 is single-phase earthing finish time neutral point voltage, current recording waveform.
Embodiment
Embodiments of the invention are elaborated below：The present embodiment is carried out lower premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process.It should be pointed out that to one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.
Embodiment
A kind of automatic tracking and compensating arc distinction system for generator neutral point, including arc suppression coil module and core control
Device, the core controller are connected with arc suppression coil module, and Tuning Control and the operation for arc suppression coil module are supervised
Survey；Wherein：
The arc suppression coil module includes：Arc suppression coil, load ratio bridging switch, secondary winding, thyristor switch and resistance
Buffer resistance, the secondary winding are wound on the iron core of arc suppression coil, and the secondary winding is through thyristor switch and damping resistance
It is connected in parallel, the load ratio bridging switch is arranged at the primary side of arc suppression coil, for being carried out to the multiple taps of arc suppression coil
Loaded tap-off switches.
Further, the arc suppression coil is turn-adjusting arc-extinguishing winding.
Further, under full compensating coefficient, the damping resistance is constant to the ratio of damping of power network.
Further, the resistance of the damping resistance is determined by any grade of number of turn of arc suppression coil.
Further, the arc suppression coil module also includes damping resistance case, and the damping resistance is arranged at damping resistance
In case.
Further, it is characterised in that the core controller includes monitoring host computer and arc-suppressing controller, the monitoring master
Machine includes CAN interface, and the monitoring host computer is communicated to connect by CAN interface and arc-suppressing controller；Wherein：
The monitoring host computer also include it is following any one or appoint multiple interfaces：
- USB interface, for exporting the electric network data of arc-suppressing controller collection；
- display module interface, for accessing display unit, there is provided human-computer interaction interface；
- printer interface, for accessing printer unit；
- serial communication interface, for accessing complex automatic system；
The arc-suppressing controller includes following module：
- parent segment plate module, for tracking measurement electric network capacitance and current changing value；
- extinguishing arc drives plate module, for being pre-adjusted arc suppression coil module inductance；
- remote signalling is remotely controlled plate module, and arc suppression coil module is controlled for automatic follow-up tuning；
- route selection plate module, for carrying out route selection to the fault branch in power network.
Further, the serial communication interface includes RS232, RS422 and/or RS458 serial line interface.
Further, the arc-suppressing controller is detected to the capacitance current of power network, pressed by sampling neutral point voltage signal
According to the capacitance current detection sensitivity of setting, sampling neutral point magnitude of voltage U0, according to U0Variable quantity decides whether to detect electric capacity again
Electric current；Wait earth fault；
After singlephase earth fault occurs, arc-suppressing controller excision damping resistance, arc suppression coil module enters full compensation shape
State；For permanent earth, input is connected to the middle resistance 1s of arc suppression coil, to each branch road zero in power network before and after resistance in input
Sequence electric current and residual voltage carry out data acquisition, and carry out route selection to the fault branch in power network by route selection plate module；Extinguishing arc
Controller is judged electric network state comprehensively, and in the case of it is determined that failure safe disappears, is put into damping resistance, returned again
Return to and state is detected to the capacitance current of power network, meanwhile, arc-suppressing controller exists to the neutral point voltage and neutral point current of power network
Each 10 cycles before and after ground connection initial time, each 10 cycles carry out data recording before and after being grounded finish time.
Further, it is described according to U0The principle that magnitude of voltage variable quantity decides whether to detect capacitance current again is：Work as U0Greatly
When starting voltage corresponding to the capacitance current detection sensitivity in setting, capacitance current is detected again.
Further, the arc-suppressing controller is transmitted by the serial communication interface of monitoring host computer to complex automatic system
Arc suppression coil module normal operating condition information and ground state information.
The present embodiment is further illustrated below in conjunction with the accompanying drawings.
The automatic tracking and compensating arc distinction system for generator neutral point that the present embodiment provides, mainly by arc suppression coil mould
Block (including band secondary winding adjusts circle arc suppression coil, load ratio bridging switch, damping resistance case) and core controller (including monitoring is led
Machine, arc-suppressing controller).The present embodiment is applied in power plant's power network, and its typical case is：Every generator neutral point installation is a set of
The automatic tracking and compensating arc distinction system that the present embodiment provides, during each generator parallel operation, automatic tracking and compensating arc distinction system
Also enter that multimachine one becomes and transport state.Arc-suppressing controller completes Tuning Control and the paired running monitoring of arc suppression coil.
In the present embodiment, arc suppression coil module sets secondary winding on turn-adjusting arc-extinguishing winding, and damping resistance is placed on
Secondary side, solve the problems, such as string damping turn-adjusting extinguishing arc, perfect turn-adjusting arc-extinguishing winding, the tune circle of solid line constant damping rate
Arc suppression coil.This arc suppression coil modular structure is summarized as follows：
As shown in Fig. 1 (a), further around a secondary winding, it will be passed through on the iron core of turn-adjusting arc-extinguishing winding in secondary winding
Thyristor switch K access damping resistances rz, K closures are switched when power network normal operation, increase power network ratio of damping makes neutral point position
Move voltage to be limited within 15% phase voltage, switch K is disconnected when singlephase earth fault occurs, to ensure the compensation of arc suppression coil
Effect.
As shown in Fig. 1 (b), when turn-adjusting arc-extinguishing winding is operated in different taps, due to the change of the primary side number of turn,
Equivalent damping resistance changes, if the number of turn of the tap of turn-adjusting arc-extinguishing winding i-th is N1i, reactance XLi, secondary side winding circle
Number is N2, total capacitance is C to power network over the groundΣ, then the equivalent damping resistance R of the i-th tapi=(N1i/N2)2rz, damping resistance is to power network
Ratio of damping：
When turn-adjusting arc-extinguishing winding be tuned to close to during full compensation, XC≈XiL, then：
X in formula2=(N2/N1i)2XLi, because secondary winding is wound on the same iron core with air gap with first winding,
In the case of ignoring leakage reactance, X2It is exactly reactance corresponding to turn-adjusting arc-extinguishing winding secondary winding, it is equal to turn-adjusting arc-extinguishing winding
When primary side is opened a way, the input reactance of secondary side, turn-adjusting arc-extinguishing winding manufacture finishes the value and determined, it is invariable
's.It can be seen that during full compensation damping resistance the ratio of damping of power network is presented as it is constant.
In addition, in terms of the Capacity Selection of turn-adjusting arc-extinguishing winding (hereinafter referred to as arc suppression coil), arc suppression coil it is specified
For voltage to act on the voltage between main winding top during rated frequency under normal operating conditions, it is nominal that its value should be equal to system
Voltage divided byThat is 6062V.According to DL/T620-1997《The overvoltage protection and Insulation Coordination of alternating-current electric device》Regulation,
The capacity of arc suppression coil should determine according to the system development plan of 5~10 years, and calculate as follows：
Wherein：The capacity of W --- arc suppression coil, kVA；
IC--- earthing capacitance current, A；
Un--- nominal voltage of a system, kV.
In order to obtain the optimal compensation effect, the automatic tracking and compensating arc distinction system that the present embodiment provides may operate in critical
Resonant condition, to prevent automatic tracking and compensating arc distinction system displacement voltage from transfiniting, it is necessary to install damping resistance additional, damping resistance is located at
In damping resistance case.For damped harmonic oscillation, series and parallel compensated resistance is effective, and domestic all use directly is gone here and there with arc suppression coil at present
The method of connection, abbreviation high-pressure series method.The weak point of this method is that the transient state for being grounded and being grounded disappearance in power network is converted
Cheng Zhong, damping resistance bear overvoltage and overcurrent, it is desirable to which the major insulation and turn-to-turn insulation of damping resistance should have certain intensity
With enough thermal capacity.Manufacturing process is careless slightly, may cause to damage.Further, since resistance is constant, with arc blowout wire
The gear of circle is different, therefore the ratio of damping of power network is also different.Arc suppression coil secondary winding and the method for resistance are used for this, its
Advantage is safe and reliable, power network constant-damping rate.
It is as follows that principle is determined in the determination of damping resistance resistance：
According to regulatory requirements, neutral point displacement voltage reaches maximum during compensation entirely：
K in formulacFor the natural degree of unbalancedness of power network, the value is generally (0.5~1.5) %, and d is the intrinsic damping of power network
Rule, the value are generally (0.3~5) %, UφFor power network phase voltage.Work as KcWhen=1.5%, substitute into above formula and obtain：
Take Kc=1.5%, d=3% substitutes into formula (5), damping resistance rz＜ 14.3X2=14.3 (N2/N1i)2XLi.It can be seen that
It is to be understood that the number of turn of any one grade of arc suppression coil, damping resistance are assured that.With the tune circle arc suppression coil of series damping resistor
Compare, the arc suppression coil of constant damping rule has superiority.
Fig. 2 is the hardware block diagram of core controller, including monitoring host computer and arc-suppressing controller, monitoring host computer be responsible for display,
Man-machine interface, with comprehensive from carrying out the function such as communicate.Monitoring host computer can use industrial control computer board, and storage is held using 2G
The CF cards of amount.
Arc-suppressing controller is responsible for completing extinguishing arc control and route selection function, including neutral point displacement voltage, neutral point current, phase
Voltage and each route selection branch road zero-sequence current analog input channel, loaded switch gear signal, remote signal, bus connection switch state and
Dual stage simultaneously transports signaling switch amount input channel, control signal of transferring the files, remote signalling amount output switch parameter passage, and cpu system.CPU systems
System can use the high-speed dsp chip of TI companies, dominant frequency 150MHz.Arc-suppressing controller uses modularized design, and each module can be with
It is extended according to actual conditions.
Monitoring host computer and arc-suppressing controller are contacted by CAN communication mode.Arc-suppressing controller can depart from prison completely
The control of main frame complete independently extinguishing arc is controlled, even if monitoring host computer breaks down, has still ensured that the normal operation of arc-extinguishing system, is improved
The reliability of system.
In the present embodiment：
Monitoring host computer (host computer) be responsible for automatic tuning controller is calculated capacitance current, current gear information,
The relevant informations such as the operation conditions of grounding alarm information, recording waveform and current arc-extinguishing system are shown to user, while user can
To set system configuration according to current practice.
Monitoring host computer can use 7 " colour liquid crystal display devices, have excellent man-machine interface, operation is directly perceived, simple, side
Just.Monitoring interface is provided with control parameter and control mode database, historical data base, it is convenient to sets control parameter and modification
The method of operation.Can controller to arc suppression coil carry out in real time control while analysis of history database a large amount of historical datas.
Arc-suppressing controller (slave computer) is the control centre of this automatic tracking and compensating arc distinction system, is responsible for real-time follow-up
The change of electric network capacitance and current, arc suppression coil inductance is pre-adjusted, realizes automatic follow-up tuning.When single-phase earthing occurs for power network
When, damping resistance is cut off, implements compensation.
The CPU of arc-suppressing controller can be reliable and stable using the quick dsp chip of TI companies, and at a high speed, dominant frequency reaches
150MHz；Passage is nursed one's health using high-speed, multi-path sampling and frequency adaptive technique, while centering point electric current, neutral point electricity simultaneously
Pressure, reference voltage carry out direct AC sampling and total digitalization processing, with reference to photoelectric isolation technology, thorough harmonic carcellation interference and
Electromagnetic interference；Arc-suppressing controller uses modularized design, and each function is designed to standalone insert, can be according to the different demands of user
It is combined into different system.
The performance indications of this automatic tracking and compensating arc distinction system are as follows：
1) arc suppression coil regulation depth (the ratio between compensation electric current upper and lower limit) 2.5；
2) it is adjustable that current levels are compensated, maximum series 30；
3) neutral point current resolution ratio is less than 50mA；
4) compensate current harmonic content and be less than 1%；
5) capacitance current accuracy of detection is less than 2%；
6) wave-recording sampling rate 10kHz；
7) it is less than 100A power network to capacitance current, ground connection residual flow reactive component is less than 2A, is less than 200A to capacitance current
Power network, ground connection residual flow reactive component be less than 4A；
8) it is more than 2s quiet earth phenomenon, line-selected earthing device route selection accuracy rate 100% to the ground connection time；
9) maximum 48 tunnels of route selection way separate unit；
10) maximum can control 4 arc suppression coil parallel runnings.
11) working power：
AC220V ± 10%50Hz or DC220V ± 10%, DC110V ± 10%；
Power supply capacity：118W.
Cabinet appearance and size：
● monitoring host computer：19 " × 4U × 273mm (wide × high × deep)；
● controller unit：19 " × 4U × 260.5mm (wide × high × deep)；
Device use condition：
● environment temperature：- 40 DEG C~+55 DEG C；
● humidity：≤ 90%；And exist without electro-conductive dust；
● atmospheric pressure：80~110Kpa；
● height above sea level is usually no more than 2500 meters；More than 2500 meters, necessary technical finesse need to be carried out to device；
● installation site：Gas and steam of the interior without corrosion metal and insulation；
● it is no more than 5 degree without strenuous vibration and big bump and surface water Pingdu.
As shown in figure 3, arc-suppressing controller workflow diagram, arc-suppressing controller realizes that capacitance current is examined by sampling U0 signals
Survey, according to the capacitance current detection sensitivity of setting, sample U0 magnitudes of voltage, decide whether to detect electric capacity again according to its variable quantity
Electric current；On-off signal information is gathered, separate unit operation or dual stage is judged and transports；By serial communication to comprehensive from transmission arc blowout wire
Enclose normal operating condition information；Wait earth fault.
After single-phase earthing occurs, excision damping resistance, arc suppression coil enter compensating coefficient to arc-suppressing controller at once, simultaneously
Generation alarm signal, and by serial communication to comprehensive from transmission ground state information；For permanent earth, resistance in input
1s, data acquisition is carried out to each branch road zero-sequence current before and after resistance in input and residual voltage, entered using zero-sequence current method of addition
Row route selection.Arc-suppressing controller is judged electric network state comprehensively, through analysis, in the case of it is determined that failure safe disappears, is thrown
Enter damping resistance, return to detection state.Meanwhile arc-suppressing controller voltage to neutral and neutral point current are when being grounded starting
Each 10 cycles (as shown in Figure 4) before and after quarter, each 10 cycles carry out data recording (as shown in Figure 5) before and after finish time.
The female of power network closes on off state and dual stage and transports signal for setting arc-suppressing controller as dual stage and transporting state, this
In the case of, it is allowed to two sets of dynamic compensating systems are simultaneously in an operation of power networks.
The automatic tracking and compensating arc distinction system that the present embodiment provides, has following features：
Intelligent-tracking multimachine is simultaneously transported
It can be achieved to optimize multicomputer or the automatic tracking and compensating of the monitoring of more parent segment paired runnings and arc suppression coil, ensure
Under different running method, the flexibility of automatic tracking and compensating arc distinction system and reliability.
Higher security
Damping resistance may be mounted at the secondary side of arc suppression coil, using thyristor throw-cut damping resistance, avoid completely existing
There are major safety risks existing for product.
More preferable damping
During the automatic tuning of electric network capacitance and current, damp and change with coil turn direct ratio, ratio of damping is invariable, begins
It is in optimal damping effect eventually.The defects of avoiding existing product damping unstable.
More excellent capacitance current measurement and tracking：
The measurement accuracy of electric current is within 2%, and entirely measurement and track algorithm use what same signal measured twice
Ratio avoids the unstable of the measurement result brought due to Measurement channel errors and variations and tracking as basic parameter completely.
Higher reliability
The present embodiment using PC104+DSP dual-cpu structures be used as core controller, using power electric isolution, insulating power supply,
Software and hardware house dog, hardware continuous self test technology, Phototube Coupling, contactless design, ensure the high reliability of system.
Recording function
Neutral point voltage and neutral point current carry out recording when single-phase earthing occurs, and support the inquiry of historical data and divide
Analysis, includes display, the output of recorder data of recording waveform.
Control system modularization
Monitoring host computer and arc-suppressing controller separate, and monitoring host computer maximum can support four parent segments.Each function of arc-suppressing controller
Module is designed to standalone insert, is configured according to the demand of user.
Smooth upgrade
It is attached using CAN communication mode between monitoring host computer and at least an arc-suppressing controller, is supported completely
The smooth upgrade of control system.
More convenient operation
Controller operation uses oscilloscope design style, simple and clear.Support simultaneously manually operated.User interface can be
WINDOWS styles, configuration, inquiry are completed between click.7 " chromatic liquid crystal screens are configured, system running state is very clear.
More complete historgraphic data recording, inquiry and export
Monitoring interface is provided with running log, control parameter and control mode database, ground connection and recorder data storehouse, can facilitate
The operation conditions of system is checked on ground, sets control parameter and the modification method of operation, analysis grounding recorder data.These historical datas
Can also easily it be exported by USB interface.
Flexible communication modes
Controller has RS-232, RS-422, RS-485 serial line interface and communication part, a substation can be used as to access various
Complex automatic system, there is remote measurement, remote signalling, distant control function.
Self-diagnostic function
System has self-diagnostic function, finds the exception of device in itself in time, and inform user.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
1. a kind of automatic tracking and compensating arc distinction system for generator neutral point, it is characterised in that including arc suppression coil module
And core controller, the core controller are connected with arc suppression coil module, the automatic tuning control for arc suppression coil module
System and operational monitoring；Wherein：
The arc suppression coil module includes：Arc suppression coil, load ratio bridging switch, secondary winding, thyristor switch and damping electricity
Resistance, the secondary winding are wound on the iron core of arc suppression coil, and the secondary winding is in parallel with damping resistance through thyristor switch
Connection, the load ratio bridging switch is arranged at the primary side of arc suppression coil, for having carried out load to the multiple taps of arc suppression coil
Tap switching.
2. the automatic tracking and compensating arc distinction system according to claim 1 for generator neutral point, it is characterised in that institute
It is turn-adjusting arc-extinguishing winding to state arc suppression coil.
3. the automatic tracking and compensating arc distinction system according to claim 1 for generator neutral point, it is characterised in that
Under full compensating coefficient, the damping resistance is constant to the ratio of damping of power network；The resistance of the damping resistance passes through arc suppression coil
Any grade of number of turn determines.
4. the automatic tracking and compensating arc distinction system according to claim 1 for generator neutral point, it is characterised in that institute
Stating arc suppression coil module also includes damping resistance case, and the damping resistance is arranged in damping resistance case.
5. the automatic tracking and compensating arc distinction system according to any one of claim 1 to 4 for generator neutral point, its
It is characterised by, the core controller includes monitoring host computer and arc-suppressing controller, and the monitoring host computer includes CAN interface,
The monitoring host computer is communicated to connect by CAN interface and arc-suppressing controller；Wherein：
The monitoring host computer also include it is following any one or appoint multiple interfaces：
- USB interface, for exporting the electric network data of arc-suppressing controller collection；
- display module interface, for accessing display unit, there is provided human-computer interaction interface；
- printer interface, for accessing printer unit；
- serial communication interface, for accessing complex automatic system；
The arc-suppressing controller includes following module：
- parent segment plate module, for tracking measurement electric network capacitance and current changing value；
- extinguishing arc drives plate module, for being pre-adjusted arc suppression coil module inductance；
- remote signalling is remotely controlled plate module, and arc suppression coil module is controlled for automatic follow-up tuning；
- route selection plate module, for carrying out route selection to the fault branch in power network.
6. the automatic tracking and compensating arc distinction system according to claim 5 for generator neutral point, it is characterised in that institute
Stating serial communication interface includes RS232, RS422 and/or RS458 serial line interface.
7. the automatic tracking and compensating arc distinction system according to claim 5 for generator neutral point, it is characterised in that institute
Arc-suppressing controller is stated by sampling neutral point voltage signal, the capacitance current of power network is detected, examined according to the capacitance current of setting
Survey sensitivity, sampling neutral point magnitude of voltage U0, according to U0Variable quantity decides whether to detect capacitance current again；Wait earth fault
Occur；
After singlephase earth fault occurs, arc-suppressing controller excision damping resistance, arc suppression coil module enters full compensating coefficient；It is right
In permanent earth, input is connected to the middle resistance 1s of arc suppression coil, to each branch road zero sequence electricity in power network before and after resistance in input
Stream and residual voltage carry out data acquisition, and carry out route selection to the fault branch in power network by route selection plate module；Extinguishing arc controls
Device is judged electric network state comprehensively, and in the case of it is determined that failure safe disappears, is put into damping resistance, backed within
State is detected to the capacitance current of power network, meanwhile, arc-suppressing controller is being grounded to the neutral point voltage and neutral point current of power network
Each 10 cycles before and after initial time, each 10 cycles carry out data recording before and after being grounded finish time.
8. the automatic tracking and compensating arc distinction system according to claim 7 for generator neutral point, it is characterised in that institute
State according to U0The principle that magnitude of voltage variable quantity decides whether to detect capacitance current again is：Work as U0Capacitance current more than setting is examined
When surveying startup voltage corresponding to sensitivity, capacitance current is detected again.
9. the automatic tracking and compensating arc distinction system according to claim 7 for generator neutral point, it is characterised in that choosing
Line plate module carries out route selection using zero-sequence current method of addition to the fault branch in power network.
10. the automatic tracking and compensating arc distinction system according to claim 7 for generator neutral point, it is characterised in that described
Arc-suppressing controller transmits arc suppression coil module normal operation by the serial communication interface of monitoring host computer to complex automatic system
Status information and ground state information.
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| CN108832609A (en) * | 2018-07-11 | 2018-11-16 | 云南电网有限责任公司电力科学研究院 | A method of singlephase earth fault is solved based on turn-adjusting arc-extinguishing winding |
| CN108964001A (en) * | 2018-08-24 | 2018-12-07 | 国网河北省电力有限公司电力科学研究院 | Arc suppression coil of power distribution network tuning methods, terminal device and system |
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| CN110108987A (en) * | 2019-03-29 | 2019-08-09 | 珠海瑞特电气设备有限公司 | A kind of direct current system electric bridge self-adjusting apparatus |
| CN112014676A (en) * | 2020-09-11 | 2020-12-01 | 西安高压电器研究院有限责任公司 | Switching test device for capacitor device type test |
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| CN112310953B (en) * | 2020-11-27 | 2022-05-31 | 芜湖科越电气有限公司 | Overvoltage comprehensive control and arc suppression coil ground fault management system |
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