CN107706891A - A kind of integrated protection and monitoring device and method for ring main unit - Google Patents
A kind of integrated protection and monitoring device and method for ring main unit Download PDFInfo
- Publication number
- CN107706891A CN107706891A CN201710824007.9A CN201710824007A CN107706891A CN 107706891 A CN107706891 A CN 107706891A CN 201710824007 A CN201710824007 A CN 201710824007A CN 107706891 A CN107706891 A CN 107706891A
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- Prior art keywords
- voltage
- protection
- pressing plate
- soft pressing
- current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
Abstract
The invention discloses a kind of integrated protection and monitoring device and method for ring main unit, including CPU；The CPU and communication module, human-computer interface module, protection module, power module, voltage x current sampling module, open and be connected into module；The protection module includes sampling coil；The sampling coil is connected with the CPU；CPU pressing plates soft with overcurrent protection, the soft pressing plate of overvoltage protection, the soft pressing plate of reclosing, the soft pressing plate of under-voltage protection, the soft pressing plate of zero sequence direction, the soft pressing plate of busbar grounding, the soft pressing plate of TV broken strings, the soft pressing plate of overload communicate.The present invention can flexibly realize various protections and observing and controlling function, suitable for the route protection of multiple voltage grade.
Description
Technical field
The present invention relates to a kind of integrated protection and monitoring device and method for ring main unit.
Background technology
The development of China's power distribution network is to increase to propose with power supply reliability requirement with urban construction scale and power load
's.Due to the historical reasons that urban planning disconnects, original distribution net work structure has not adapted to the demand of urban development, tradition
Distribution system be the power supply mode supplemented by radiant type and trunk formula based on radiant type.Because multiple users are connected to an electricity
Source line, once power line breaks down or overhauled, all users for necessarily causing trunk line back have a power failure, power supply reliability
Difference, main line is connect to improve power supply reliability, reducing aerial branch line, advocates that direction is ring network power supply at present.
Using ring network power supply, such a mode causes power supply reliability to greatly improve, at present distribution system current supply loss it is big, from
Dynamicization degree is low, troubleshooting is replied slowly, has had a strong impact on consumption reduction and the synergy of power supply enterprise, far from adaptation operation power body
The market-oriented reform of system, for gradual perfection Distribution Management System, raise the management level undoubtedly significant.With distribution
The construction and development of automatic system, the direction that cable ring-system power supply will develop as urban distribution network.Current most ring main unit
All also it is not equipped with the function of monitoring and protection.
The content of the invention
The technical problems to be solved by the invention are, in view of the shortcomings of the prior art, providing a kind of synthesis for ring main unit
Protection supervisory equipment and method, flexibly realize various protections and observing and controlling function.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of integrated protection for ring main unit
Measure and control device, including CPU；The CPU adopts with communication module, human-computer interface module, protection module, power module, voltage x current
Egf block, open into module connection；The protection module includes sampling coil；The sampling coil is connected with the CPU；It is described
CPU and the soft pressing plate of overcurrent protection, the soft pressing plate of overvoltage protection, the soft pressing plate of reclosing, the soft pressing plate of under-voltage protection, the soft pressure of zero sequence direction
Plate, the soft pressing plate of busbar grounding, the soft pressing plate of TV broken strings, the soft pressing plate communication of overload.
Correspondingly, present invention also offers a kind of integrated protection investigating method for ring main unit, including：
Current protection：When the soft pressing plate of overcurrent protection is in input state and the circuit low-pressure side of voltage x current sampling module collection
Three-phase current Ia, Ib, Ic wherein phase current are more than current setting value, and after time delay T, the outside open circuit of protection exit control
Device trips, so as to play a protective role；
Overvoltage protection：When the soft pressing plate of overvoltage protection is in input state, the circuit low pressure of voltage x current sampling module collection
Side line voltage Uab, Ubc, Uca wherein phase voltage are more than voltage setting value, and electric current is more than 0.2A on circuit, opens and is adopted into module
When collection switch position signal is shown in conjunction position, by time delay T, if tripping operation, protection exit control are thrown in the action of control word overvoltage protection
The outside circuit breaker trip of system, otherwise alarms；
Under-voltage protection：When the soft pressing plate of under-voltage protection is in input state, Uab, Ubc, Uca wherein phase voltage, which are less than, to be set
Definite value, and by open into module gather switch position signal be in close position when, if three-phase current is all less than without threshold on circuit
Electric current 0.2A or low-voltage variation be not through there is stream locking, then after time delay T, protection exit control external short circuit device tripping operation；
Zero-sequence voltage injection：Input state is in zero sequence alarm, zero-sequence current and residual voltage are respectively greater than zero sequence electricity
Setting value, residual voltage setting value are flowed, and the angle between zero-sequence current and residual voltage sends announcement at 195 degree to 345 degree
Alert signal；
Reclosing is protected：
After starting recloser condition meets, line side voltage ULMore than 50V, as the pressure differential deltap U=│ at outside breaker both ends
Um- UL│ ＜ 2UeSin (φ/2) duration is more than reclosing delay time, and reclosing sends closing pulse, wherein φ
For same period angle definite value；
After starting recloser condition satisfaction and duration are more than reclosing delay, if line side voltage is determined less than checkout voltage
Value, then reclosing sends closing pulse, if any phase voltage Ux is more than checkout voltage definite value, switchs to examine same period coincidence automatically
Lock, x=a, b, c；
When working as hand trip(ping), remote control tripping operation, overload, low-frequency load reduction or low-voltage load sheding action, automatic blocking reclosing work(
Energy；
Busbar grounding alerts：Put into when busbar grounding alerts soft pressing plate, and residual voltage is more than setting value, prolongs by one section
Shi Hou, type is moved back according to throwing and sends different alarm signals；
The alarm of TV broken strings and latch-up protection：During TV broken string alarm inputs, when any one phases line voltage is less than 70V, Yi Jiren
A phase current of anticipating is more than 0.04In, after one section of delay, moves back type according to throwing and sends different alarm signals；
Overload alerts：When the soft pressing plate of overload protection is put into, and any one phase current is more than setting value, by time delay
After T, type is moved back according to throwing and sends different alarm signals.
Current setting value is 0.1~200.0A.
Time delay T is 0~99s.
Voltage setting value is 100.0~500.0V.
Zero-sequence current setting value is 0.1~12.0A；Residual voltage setting value is 1V~20V.
Compared with prior art, the advantageous effect of present invention is that：The present invention can flexibly realize various protections and survey
Function is controlled, suitable for the route protection of multiple voltage grade, switching station is realized and comprehensively measures, protects, monitoring and electric energy
The functional requirement of quality analysis, failure can be quickly cut off, important guarantee is provided for power system stability operation.
Brief description of the drawings
Fig. 1 is structure drawing of device of the embodiment of the present invention；
Fig. 2 is protection module structure chart of the embodiment of the present invention；
Fig. 3 is current protection schematic diagram of the embodiment of the present invention；
Fig. 4 is overvoltage protection schematic diagram of the present invention；
Fig. 5 is low-voltage variation schematic diagram of the present invention；
Fig. 6 is that zero sequence direction of the present invention alerts schematic diagram；
Fig. 7 is reclosing schematic diagram of the present invention；
Fig. 8 is that busbar grounding of the present invention alerts schematic diagram；
Fig. 9 is TV of the present invention broken string alarm schematic diagrams；
Figure 10 is that overload of the present invention alerts schematic diagram.
Embodiment
As shown in figure 1, apparatus of the present invention include MCU module (CPU), open into module, LCD MODULE, protection module,
Communication module, power module.
The bit DSP chip of high-performance 16 that MCU module is provided using the micro- core in the U.S., data processing function is powerful, its main work(
It can be handed over for device Data Analysis Services, logic function judgement, faulted-phase judgment and action and its with other communication equipment informations
Mutually.
Ring main unit protection dress observing and controlling confidence number mainly has two classes, i.e. switching value and analog signalses.Signal input circuit portion
It is exactly to deal carefully with this two classes signal to divide, and completes single-chip microprocessor system input signal interface function.The switching value letter commonly entered
It number can not meet the incoming level requirement of single chip microcomputer, it is therefore desirable to which signal level is changed.In order to improve the anti-dry of protection device
Immunity energy, generally also need to the processing such as shaped, delay, Phototube Coupling.
Protection module provides excessively stream I sections, excessively stream II sections, excessively stream III sections, under-voltage protection, overvoltage protection for device, bag
Include excessively stream I sections, II sections and III sections fixed value adjusting and time parameter is set, under-voltage protection fixed value adjusting and time parameter are set
Deng.
Communication module major function is by the data of device collection and outputs action message and produce, and supports RS485 serial ports to lead to
News and the communication of TCP/IP EPAs mouth.
Integrated protection and monitoring device is higher to power requirement, is the direct current needed for microsystem generally AC rectification
Pressure.Power module is isolated entirely from the dc source of the strong power system of electric substation and the weak electricity system power supply of microcomputer.By inverse
Dc source after change has extremely strong anti-interference level, in electric substation because strong caused by the reasons such as breaker breaker tripping and closing
Interference can be completely eliminated.
1st, protection philosophy
Protection module structure chart is as shown in Figure 2.
(1) three sect current protection
If three sect current protection, each section of electric current and time definite value can be adjusted independently, by set respectively the soft pressing plate of protection come
The throwing of this two sections protections is controlled to move back.
Fig. 3 show I section of schematic diagram of electric current, and II, III section of electric current is similar.When the soft pressing plate of overcurrent protection input state and
Ia, Ib, Ic one of which electric current are more than setting value (0.1~200.0A can be set online), and after one section of delay (0~99s),
Protection act circuit breaker trip outside control of export, so as to play a protective role.
(2) overvoltage protection
Device is provided with the one section of overvoltage protection that can adjust delay (100.0~500.0V of setting valve, be delayed 0~99s), can
Thrown and moved back by soft pressing plate, while tripping operation/alarm may be selected by control word.
This protection is in breaker and closes position or put into when having stream, malfunctions or transmits by mistake during preventing that capacitor from not throwing
Number.There is fluid element to sentence and take fixed value 0.2A (In=5A) without stream threshold,
It is following without stream threshold herewith.
When the soft pressing plate of overvoltage protection is in input state, when Uab, Ubc, Uca one of which voltage are more than setting value and circuit
Upper electric current be more than 0.2A and open into module collection switch position signal be shown in close position when, by one section delay, if control word mistake
Protection act is pressed to throw tripping operation, then circuit breaker trip outside device control of export, otherwise device can be flashed by warning light.
(3) under-voltage protection
To prevent that circuit disconnection causes capacitor bank to lose power supply after the system failure, and circuit coincidence makes bus powered,
Make capacitor bank because of voltage accumulation and overvoltage is damaged, device, which is provided with, can adjust one section of under-voltage protection of delay, can be by soft
Pressing plate is thrown and moved back.
This protection has added stream barring condition, and the locking bar to avoid TV three-phases broken string from causing low-voltage malfunction
Control can be thrown/be moved back to part.
When the soft pressing plate of under-voltage protection is in the state of input, and Uab, Ubc, Uca wherein phase voltage are less than setting value and lead to
Cross to open and be in into module collection switch position signal when closing position, if on circuit three-phase current all less than without threshold electric current 0.2A or
Low-voltage variation is not through there is stream locking, then after one section of delay, unit protection acts trips in control of export external short circuit device.
(4) zero-sequence voltage injection
When single-phase earthing occurs for isolated neutral system, device provides to be protected by the zero sequence direction of zero sequence sleeve pipe TA supplies
Shield, alert or trip for single-phase earthing.When single-phase earthing occurs for isolated neutral system, non-fault line flows through its own
Capacitance current, direction flow to circuit, 90 ° of the advanced residual voltage of zero-sequence current by bus.Faulty line flows through all non-on bus
The capacitance current sum of faulty line, direction flow to bus by circuit, and zero-sequence current falls behind 90 ° of residual voltage.
When zero sequence alarm be in input state, zero-sequence current and residual voltage more than setting value (zero-sequence current 0.1~
12.0A, residual voltage 1V~20V) when, and the device meeting at 195 degree to 345 degree of the angle between zero-sequence current and residual voltage
Send alarm signal.
Three-phase single shot reclosing
The general circuit breaker position provided using opening into module of unit protection module reclosing closes position, jumps position to differentiate, therefore
Control loop template answers lock-reclosing lock.
In order to ensure the disposable of reclosing action and be needed when closing by hand is in failure without reclosing, reclosing
There is a time.In mechanical type relay, multiple switching relay is encouraged by the discharge current of external capacitor, electric capacity
The charging interval of device is the time of reclosing.When the present apparatus then simulates the discharge and recharge of aforementioned capacitor with software logic
Between.When reclosing function input, switch close position 20 seconds, the non-energy storage contact of outside breaker spring disconnects three conditions and all met
When, reclosing charging complete (i.e. reclosing is ready to, and can be overlapped).After reclosing charging complete, once trip protection
Or the position of the switch does not correspond to, it is delayed by reclosing, starting recloser.
The startup of reclosing has two ways：Uncorresponding start-up and protection start.Starting mode is protected to be jumped in protection act
Start reclosing after circuit breaker, can not start reclosing during breaker jump, it is (2tcch+1 that protection, which starts the open hour,
Second), wherein tcch is delayed for reclosing.It is from closing (non-jump manual on the spot after position is changed into jump position during uncorresponding start-up in breaker
Lock and remote control tripping operation) overlapped.Therefore it is preferential in a manner of uncorresponding start-up on present apparatus logic judgment.
After starting recloser, selection checkout voltage, the inspection same period are moved back according to throwing or do not examined.When there is power supply circuit both sides, device
Optional checkout voltage, inspection two kinds of coincidence systems of the same period.To prevent non-Switching Synchronization, in reclosing menu, inspection same period line may be selected
Road voltage is line voltage or phase voltage, so that bus bar side voltage takes relevant voltage.
A) same period principle is examined：After starting recloser condition meets, device acquisition module gathers circuit by voltage transformer
Side voltage ULMore than 50V, when the pressure difference at outside breaker both ends, that is, bus bar side and line side difference DELTA U=│ Um- UL│ ＜
2UeSin (φ/2) duration is more than reclosing delay time, and reclosing sends closing pulse.Wherein φ is same period angle
Spend definite value.
Checkout voltage principle：After starting recloser condition satisfaction and duration are more than reclosing delay, if line side voltage
Less than checkout voltage definite value, then reclosing sends closing pulse, and checkout voltage is checked primarily to preventing out after reclosing delay
Close the asynchronism of displacement and line voltage distribution disappearance.If Ux (any one voltage) is more than checkout voltage definite value, switch to automatically
Synchronous recloser.
A) not check weighing is closed a floodgate：The amplitude or phase angle for not differentiating Ux (any one voltage) are directly closed a floodgate.
Work as hand trip(ping), remote control tripping operation, overload, when low-frequency load reduction or low-voltage load sheding act, device automatic blocking overlaps
Lock function.The breaker that device reclosing is typically provided using built-in function loop plug-in unit closes position, jumps position to differentiate, therefore controls back
Road broken string answers lock-reclosing lock.
2nd, minor alarm principle
(1) busbar grounding alerts
When device accesses PT open delta voltages, the function can determine whether the single-phase earthing of small earthing current system.Device carries altogether
Mode of moving back, the i.e. female ground connection of 10kV I, the female ground connection of 10kV II, the female ground connection of 35kV I, the female ground connection of 35kV II are thrown for four kinds.User can basis
The open delta voltage of device access, is flexibly adjusted.Device also moves back type according to throwing and sends different alarm signals.
When busbar grounding alerts soft pressing plate input and residual voltage is more than setting value (20~60V) by one section of delay (0
~99s) afterwards device can move back type according to throwing and send different alarm signals
(2) alarm of TV broken strings and latch-up protection
Device judges that PT breaks according to following two criterions.
A. a certain line voltage is less than 70V while any phase current is more than 0.04In.
B. negative sequence voltage is more than 8V.
Work as any one line voltage less than 70V when TV breaks alarm input and any one electric current be more than 0.04In,
Device can move back type according to throwing and send different alarm signals after one section of delay (0~99s), the meeting when latch-up protection is put into
Close related defencive function.
(3) overload alerts
Overload element monitors the electric current of any phase, and its operation condition is：
A. any one phase current Ix>ISet；
B. time delayses arrive.
Wherein Ix is any one phase current, ISetFor overload electric current definite value.
When the soft pressing plate input of overload protection and any one electric current is more than setting value (0.1~200A) by one section of delay
After (0~99s), device can move back type according to throwing and send different alarm signals.
Claims (6)
1. a kind of integrated protection and monitoring device for ring main unit, it is characterised in that including CPU；
The CPU and communication module, human-computer interface module, protection module, power module, voltage x current sampling module, open into mould
Block connects；The protection module includes sampling coil；
The sampling coil is connected with the CPU；CPU pressing plates soft with overcurrent protection, the soft pressing plate of overvoltage protection, reclosing are soft
Pressing plate, the soft pressing plate of under-voltage protection, the soft pressing plate of zero sequence direction, the soft pressing plate of busbar grounding, the soft pressing plate of TV broken strings, the soft pressing plate of overload
Communication.
A kind of 2. integrated protection investigating method for ring main unit, it is characterised in that including：
Current protection：When the soft pressing plate of overcurrent protection is in input state and the circuit low-pressure side three-phase of voltage x current sampling module collection
Electric current Ia, Ib, Ic wherein phase current are more than current setting value, and after time delay T, the outside breaker of protection exit control is jumped
Lock, so as to play a protective role；
Overvoltage protection：When the soft pressing plate of overvoltage protection is in input state, the circuit low pressure side line of voltage x current sampling module collection
Voltage Uab, Ubc, Uca wherein phase voltage are more than voltage setting value, and electric current is more than 0.2A on circuit, open and are opened into module collection
When off position signal is shown in conjunction position, by time delay T, tripped if the action of control word overvoltage protection is thrown, outside protection exit control
Portion's circuit breaker trip, otherwise alarms；
Under-voltage protection：When the soft pressing plate of under-voltage protection is less than setting in input state, Uab, Ubc, Uca wherein phase voltage
When being worth, and switch position signal is gathered in conjunction position into module by opening, if three-phase current is all less than without threshold electricity on circuit
Flow 0.2A or low-voltage variation not through there is stream locking, then after time delay T, protection exit control external short circuit device tripping operation；
Zero-sequence voltage injection：Input state is in zero sequence alarm, zero-sequence current and residual voltage are respectively greater than zero-sequence current and set
Definite value, residual voltage setting value, and the angle between zero-sequence current and residual voltage sends alarm letter at 195 degree to 345 degree
Number；
Reclosing is protected：
After starting recloser condition meets, line side voltage ULMore than 50V, as the pressure differential deltap U=│ U at outside breaker both endsm-
UL│ ＜ 2UeSin (φ/2) duration is more than reclosing delay time, and reclosing sends closing pulse, and wherein φ is same
Phase angle definite value；
After starting recloser condition satisfaction and duration are more than reclosing delay, if line side voltage is less than checkout voltage definite value,
Then reclosing sends closing pulse, if any phase voltage Ux is more than checkout voltage definite value, switchs to synchronous recloser, x automatically
=a, b, c；
When working as hand trip(ping), remote control tripping operation, overload, low-frequency load reduction or low-voltage load sheding action, automatic blocking reclosing function；
Busbar grounding alerts：Put into when busbar grounding alerts soft pressing plate, and residual voltage is more than setting value, by one section of delay
Afterwards, type is moved back according to throwing and sends different alarm signals；
The alarm of TV broken strings and latch-up protection：During TV broken string alarm inputs, when any one phases line voltage is less than 70V, and it is any one
Phase current is more than 0.04In, after one section of delay, moves back type according to throwing and sends different alarm signals；
Overload alerts：When the soft pressing plate of overload protection is put into, and any one phase current is more than setting value, after time delay T,
Type is moved back according to throwing and sends different alarm signals.
3. the integrated protection investigating method according to claim 2 for ring main unit, it is characterised in that current setting value is
0.1~200.0A.
4. the integrated protection investigating method according to claim 2 for ring main unit, it is characterised in that time delay T be 0~
99s。
5. the integrated protection investigating method according to claim 2 for ring main unit, it is characterised in that voltage setting value is
100.0~500.0V.
6. the integrated protection investigating method according to claim 2 for ring main unit, it is characterised in that zero-sequence current is set
It is worth for 0.1~12.0A；Residual voltage setting value is 1V~20V.
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| CN201710824007.9A CN107706891A (en) | 2017-09-13 | 2017-09-13 | A kind of integrated protection and monitoring device and method for ring main unit |
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| CN201710824007.9A CN107706891A (en) | 2017-09-13 | 2017-09-13 | A kind of integrated protection and monitoring device and method for ring main unit |
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| CN108183461A (en) * | 2018-03-05 | 2018-06-19 | 温州科宇电器有限公司 | A kind of photovoltaic plant directional current protection method and central control module |
| CN108347042A (en) * | 2018-04-02 | 2018-07-31 | 安徽广祺智能电器股份有限公司 | A kind of looped network cabinet intelligent accurately measures the system and its implementation for cutting off protection on the spot |
| CN108448724A (en) * | 2018-04-02 | 2018-08-24 | 安徽广祺智能电器股份有限公司 | A kind of the ring main unit control system and its implementation of Intellectual computer protection |
| CN108808637A (en) * | 2018-06-06 | 2018-11-13 | 镇江市高等专科学校 | Adaptive Current Protection method based on power distribution network definite value domain |
| CN109193952A (en) * | 2018-11-15 | 2019-01-11 | 湖南长高思瑞自动化有限公司 | A kind of techniques of feeder terminal unit in power distribution network and fault detection guard method based on GPRS communication |
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| CN108448724A (en) * | 2018-04-02 | 2018-08-24 | 安徽广祺智能电器股份有限公司 | A kind of the ring main unit control system and its implementation of Intellectual computer protection |
| CN108808637A (en) * | 2018-06-06 | 2018-11-13 | 镇江市高等专科学校 | Adaptive Current Protection method based on power distribution network definite value domain |
| CN109193952A (en) * | 2018-11-15 | 2019-01-11 | 湖南长高思瑞自动化有限公司 | A kind of techniques of feeder terminal unit in power distribution network and fault detection guard method based on GPRS communication |
| CN109245311A (en) * | 2018-11-15 | 2019-01-18 | 湖南长高思瑞自动化有限公司 | A kind of the distribution website institute's terminal and remote control method of band GPRS function |
| CN110504756A (en) * | 2019-09-04 | 2019-11-26 | 珠海西格电力科技有限公司 | A kind of ring network cabinet protective device control system |
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