CN106229998A - A kind of electric power monitoring system - Google Patents

A kind of electric power monitoring system Download PDF

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Publication number
CN106229998A
CN106229998A CN201610677515.4A CN201610677515A CN106229998A CN 106229998 A CN106229998 A CN 106229998A CN 201610677515 A CN201610677515 A CN 201610677515A CN 106229998 A CN106229998 A CN 106229998A
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CN
China
Prior art keywords
power
current
voltage
phase
short circuit
Prior art date
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Pending
Application number
CN201610677515.4A
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Chinese (zh)
Inventor
孙文传
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ANHUI ZHONGSHENG ELECTRIC POWER TECHNOLOGY Co Ltd
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ANHUI ZHONGSHENG ELECTRIC POWER TECHNOLOGY Co Ltd
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Priority to CN201610677515.4A priority Critical patent/CN106229998A/en
Publication of CN106229998A publication Critical patent/CN106229998A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • 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
    • H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
    • 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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

nullThe present invention proposes a kind of electric power monitoring system，Including power equipment，Described power equipment connects reactive power compensator and power distribution protective device，Described reactive power compensator and power distribution protective device connect central controller，Utilize power distribution protective device according to the prospective short circuit current of the parameter determination power supply unit of power equipment，Described short-circuit protector monitors the operation short circuit current of power equipment in real time，When the operation short circuit current of monitoring reaches prospective short circuit current，And short circuit duration beyond the first pre-set threshold value time，Described short-circuit protector cuts off the power supply of power equipment，Compensating controller is according to real-time voltage、Electric current，Calculate reactive power，Determine and need the idle of compensation，Thus according to default Switching Strategy，The part switching capacitance controlled in switching capacitance group carries out reactive-load compensation，The present invention is capable of the reactive-load compensation of electrical network，Power distribution protection can be carried out simultaneously，At guarantee power factor，While reducing electric energy loss，Ensure that balance of plant runs.

Description

A kind of electric power monitoring system
Technical field
The invention belongs to technical field of electric power, particularly to a kind of electric power monitoring system.
Background technology
At present, along with economic fast development, low pressure (exchange is less than 1500V less than 1000V or direct current) power distribution system Uniting in occupation of leading position, it is being finally connected between power system with end user, is to contact the most closely with user, use The link that equipment is at most, circuit is the longest, power consumption is maximum, be unable to do without low in factory, mine, city, rural area etc. everywhere Pressure distribution system, so, reasonable, the safe efficient and stable operation of low-voltage distribution system, direct relation the use of users Electricity reliability and power quality, thus low-voltage distribution system distribution line, control equipment etc. are carried out protection and is significant. Breaker of plastic casing, fuse or RCCB are selected in low-voltage distribution protection at present more, it is achieved quick-break, long delay protection, but very Many breaker of plastic casing operation precision is inadequate, and do not possess real time monitoring signals show, the function such as logout and communication networking；And The thermorelay used is as motor overload protection and controls element, is limited by element quality, technique, cannot meet day Exhibition automation technolo requirement increasingly.
Strengthen the quality of power supply and energy-saving and cost-reducing impact be particularly significant, take among these Reactive Compensation Mode improve power because of Number degradation is all effective measure.In power supply system, the raising of power factor is an important technical work, It is directly connected to the electric energy loss of transmission line of electricity and the economy of power supply, power supply quality.The indemnifying measure of power factor is always People are paid attention to.Develop high performance power factor compensation device and there is the society of reality, economic benefit.And in power system In, reactive power to keep balance, otherwise, it will make system voltage decline, time serious, can cause device damage, system break-down. Additionally, the power factor of network and voltage reduce, make electrical equipment be not fully utilized, promote network capacity to decline, Loss increases.Therefore, resolve network building out problem, network wastage reducing and energy saving is had particularly important meaning.
Series compensation and shunt compensation can be divided into by power network reactive power compensation mode.Shunt compensation mode can be divided into again electricity Container group compensates, and adjusts inductance compensation, the phase-shift compensation etc. that phase modifier compensates.The design we shnt capacitor will be used to compensate, Mainly apply singlechip technology, it is achieved the monitoring to low-voltage power system, complete the measurement of power factor, and according to the data obtained Carry out the switching of capacitance group, to realize the compensation of the power factor to power system.
Idle compensating control is the core of reactive-load compensation, and its performance directly affects the effect of compensation.It is according to detection Power factor or reactive power, put into/excise capacitor according to certain control rule, realize circuit is carried out idle benefit Repay.Having quite a few in low-voltage network is inductive load, and it not only to consume substantial amounts of active power, also to absorb very Many reactive powers, so that power factor declines, cause reactive power source not enough, and system voltage reduces, and electric energy loss increases, this Leverage the power supply capacity of electrical network.
Therefore, a kind of electric power monitoring system is needed now badly, it is possible to realize the reactive-load compensation of electrical network, distribution can be carried out simultaneously Protection, at guarantee power factor, while reducing electric energy loss, it is ensured that balance of plant runs.
Summary of the invention
The present invention proposes a kind of electric power monitoring system, solves in prior art electrical network because of reactive power and causes power factor The problem declined and cause power equipment to damage due to short circuit current.
The technical scheme is that and be achieved in that: electric power monitoring system, including power equipment, described power equipment is even It is connected to reactive power compensator and power distribution protective device, described reactive power compensator and power distribution protective device connection and has central control Device, utilizes power distribution protective device according to the prospective short circuit current of the parameter determination power supply unit of power equipment, described short-circuit protection The operation short circuit current of power equipment monitored in real time by device, when the operation short circuit current of monitoring reaches prospective short circuit current, and short circuit When time is beyond the first pre-set threshold value, described short-circuit protector cuts off the power supply of power equipment, and compensating controller is according to reality Time voltage, electric current, calculate reactive power, determine need to compensate idle, thus according to default Switching Strategy, control to throw The part switching capacitance cut in capacitance group carries out reactive-load compensation.
As one preferred embodiment, described power distribution protective device, including distribution controller, described distribution controller Connect have short-circuit protector, described distribution controller according to the prospective short circuit current of the parameter determination power supply unit of power equipment, Described short-circuit protector monitors the operation short circuit current of power equipment in real time, when the operation short circuit current of monitoring reaches expection short circuit Electric current, and when short circuit duration exceeds the first pre-set threshold value, shown by display, and described short-circuit protector cuts off electric power The power supply of equipment.
As one preferred embodiment, short-circuit protector includes automatic circuit and sectionaliser, and distribution controller utilizes and divides Section device realizes closing of short circuit current, and distribution controller utilizes automatic circuit to excise short circuit current, the pre-set coincidence of automatic circuit Number of times, when the actual coincidence number of times of switch reaches setting value and switchs board gate-dividing state, then locking automatic closing, isolation event Barrier circuit, automatic circuit is provided with gap periods, and gap periods is the time interval of each deciliter of automatic circuit operation, dividing of sectionaliser Closing operation is decided by line voltage distribution, the power supply of switch i.e. separating brake, then closes a floodgate after incoming call.
As one preferred embodiment, according to the maximum short circuit current of power equipment, the quick-break of power equipment is determined One sub-value, wherein quick-break one sub-value is linear with maximum short circuit current, and maximum short circuit current uses directly maximum transformation Device is placed in route head end and calculates maximum short circuit current, and the supply line of described power supply unit connects protection system to earth, described Protection system to earth is when occurring power supply unit to touch shell earth fault, and earth current passes through earth resistance and the ground connection of power supply unit The earth resistance of protection system forms loop, and produces pressure drop on two resistance, reduces institute on power supply unit shell with voltage.
As one preferred embodiment, current quick is utilized, it is stipulated that three-phase shortcircuit under maximum operational mode Time, protection domain is maximum, and for lmax, under minimum operational mode during line to line fault, protection domain is minimum, for lmin, wherein, Under minimum operational mode, the relative value of fast tripping protection scope meets:
l b = l min l A B × 100 % ≥ ( 15 - 20 ) %
I s e t .1 1 = k r e l 1 I 2 K 3. max
l min = 1 x 1 ( 3 2 × E s I o p . k - X S . m a x )
In formula: K1rel--safety factor；Line end three-phase shortcircuit stable state electricity under I2k3.max--maximum operational mode Stream；Iopk--protection device one-off electric current；Es--system reference voltage；Under XS.Max--system maximum operational mode Little equivalent impedance, current quick scope includes lower bar circuit or the end of power equipment, the action current of protection seting The overload electric current of circuit should be escaped, when supply line's imbalance of three-phase voltage rate is more than target setting, and prolong beyond imbalance Time the time after, controller controls to start Voltage unbalance protection, determines three-phase piezoelectricity unbalance factor, uses and arrange capacitor device Realize, some group capacitor devices are carried out star-star connection mode connection, the voltage power taking case of unstable voltage protection The open delta voltage of group.
As one preferred embodiment, described reactive power compensator, including current transformer and voltage transformer, its Being characterised by, described current transformer and voltage transformer connect phase detection device, and described phase detection device connects to be had Compensating controller, described compensating controller calculating current transformer and the phase difference value of voltage transformer, determine the merit of this phase Rate factor, described compensating controller connects power factor display unit and switching control circuit, and described switching control circuit is even Being connected to switching capacitance group, described voltage transformer summation current transformer includes A phase transformer, B phase transformer and C phase mutual inductance respectively Device, described switching capacitance group includes A phase electric capacity, B phase electric capacity and C phase electric capacity.
As one preferred embodiment, described phase detection device includes that the voltage ratio that is connected with voltage transformer is relatively Device and the I/V transducer being connected with current transformer, described I/V transducer connects voltage transformer, described voltage transformer Connect and have phase discriminator, described phase discriminator enumerator.
As one preferred embodiment, described switching control circuit includes a zero-voltage detector, described no-voltage , by being connected input order with door, there is multivibrator detector one end described connection with door, and described zero-voltage detector connects Having photoelectrical coupler, the other end of described photoelectrical coupler is connected by resistance IGCT, and described IGCT connects pulse Isolated amplifier, described power factor display unit includes LED display unit.
As one preferred embodiment, described compensating controller connects has power circuit, described power circuit to include Three terminal regulator, connects between input and the earth terminal of described three terminal regulator and has the first electric capacity, described three terminal regulator Connecting between output and ground and have the second electric capacity, the input of described three terminal regulator is connected by rectification circuit and transformator Connecing power supply, described compensating controller is preset with the first valve value rate factor, when compensating controller adopting according to phase detection device When collection data determine this phase power factor more than this first valve value rate factor, do not compensate；When compensating controller obtains root When determining this phase power factor less than this first valve value rate factor according to the collection data of phase detection device, compensate.
As one preferred embodiment, compensating controller determines this phase merit according to the collection data of phase detection device Rate factor, including being acquired obtaining real-time network signal, through isolation module to three-phase voltage, three-phase current in system simultaneously Isolation processing after, then carry out N point constant duration and obtain voltage and current sequence, obtain the complex discrete sequence about the time Row, then carry out Fourier's series, then carry out discrete Fourier change, obtain voltage, current vector with humorous according to its conjugation correction Relation between ripple, when not considering DC component, derives this phase place harmonic voltage and the virtual value of harmonic current, so that it is determined that have Merit power, obtains the power factor of this phase place, and described compensating controller, according to real-time voltage, electric current, calculates reactive power, Determine and need the idle of compensation, thus according to default Switching Strategy, the part switching capacitance controlled in switching capacitance group is carried out Reactive-load compensation.
After have employed technique scheme, the invention has the beneficial effects as follows: by reactive power compensator, improve power because of Number: avoid electromotor to reduce power factor as far as possible and run, prevents from distally loading that conveying is idle causes voltage and power attenuation, should At user, carry out low power factor limit, i.e. take local reactive power compensation measure；Improve voltage-regulation: load is to reactive requirement Change, the change of supply terminals voltage can be caused, if this change is adjusted from power end (power plant), can cause Problem, and the equipment that compensates just plays maintenance supply voltage important function in prescribed limit；The balance of regulating load: when just When often emerged in operation asymmetrical three-phase runs, there will be negative phase-sequence, zero-sequence component, added losses will be produced, make commutator ripple Coefficient increases, and causes transformator saturated, and compensated equipment just can make unbalanced load become balanced load；It addition, by estimating Calculate prospective short circuit current, and quick-break current value, be up to prospective short circuit current shortly and achieve auto-cutout protection；Meanwhile, also It is provided with Voltage unbalance protection, is determined the target setting of imbalance of three-phase voltage rate by the unbalance factor of three-phase piezoelectricity；This Invention is capable of power distribution protection, it is ensured that the balance movement of power equipment.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the block diagram of the present invention；
Fig. 2 is the block diagram of power distribution protective device；
Fig. 3 is the block diagram of reactive power compensator；
Fig. 4 is the schematic diagram of power circuit；
Fig. 5 is the schematic diagram cutting control circuit；
Fig. 6 is the schematic diagram of phase detection device.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.
As shown in figures 1 to 6, electric power monitoring system, including power equipment, described power equipment connects reactive power compensator With power distribution protective device, described reactive power compensator and power distribution protective device connection have central controller, power distribution protection is utilized to fill Putting the prospective short circuit current of parameter determination power supply unit according to power equipment, described short-circuit protector monitors power equipment in real time Operation short circuit current, when the operation short circuit current of monitoring reaches prospective short circuit current, and short circuit duration presets valve beyond first During value, described short-circuit protector cuts off the power supply of power equipment, and compensating controller, according to real-time voltage, electric current, calculates Go out reactive power, determine and need the idle of compensation, thus according to default Switching Strategy, control the part in switching capacitance group and throw Cut electric capacity and carry out reactive-load compensation.
Described power distribution protective device, including distribution controller, described distribution controller connect have short-circuit protector, described in join Electric controller monitors electricity in real time according to the prospective short circuit current of the parameter determination power supply unit of power equipment, described short-circuit protector The operation short circuit current of power equipment, when the operation short circuit current of monitoring reaches prospective short circuit current, and short circuit duration is beyond first During pre-set threshold value, shown by display, and described short-circuit protector cuts off the power supply of power equipment.
Short-circuit protector includes automatic circuit and sectionaliser, and distribution controller utilizes sectionaliser to realize closing of short circuit current, Distribution controller utilizes automatic circuit to excise short circuit current, and automatic circuit pre-set coincidence number of times, when the actual coincidence time of switch When number reaches setting value and switchs board gate-dividing state, then locking automatic closing, isolated fault circuit, automatic circuit is provided with interval In the cycle, gap periods is the time interval of each deciliter of automatic circuit operation, and a deciliter operation for sectionaliser is decided by line voltage distribution, opens The power supply i.e. separating brake closed, then closes a floodgate after incoming call.
According to the maximum short circuit current of power equipment, determine quick-break one sub-value of power equipment, wherein quick-break one sub-value with Maximum short circuit current is linear, and maximum short circuit current employing is directly placed in route head end maximum transformator and calculates maximum short Road electric current, the supply line of described power supply unit connects protection system to earth, and described protection system to earth sets when generation power supply For when touching shell earth fault, earth current is formed back by the earth resistance of power supply unit and the earth resistance of protection system to earth Road, and on two resistance, produce pressure drop, reduce institute on power supply unit shell with voltage.
Utilizing current quick, it is stipulated that under maximum operational mode during three-phase shortcircuit, protection domain is maximum, for lmax, Under minimum operational mode during line to line fault, protection domain is minimum, for lmin, wherein, under minimum operational mode, fast tripping protection The relative value of scope meets:
l b = l min l A B × 100 % ≥ ( 15 - 20 ) %
I s e t .1 1 = k r e l 1 I 2 K 3. max
l min = 1 x 1 ( 3 2 × E s I o p . k - X S . m a x )
In formula: K1rel--safety factor；Line end three-phase shortcircuit stable state electricity under I2k3.max--maximum operational mode Stream；Iopk--protection device one-off electric current；Es--system reference voltage；Under XS.Max--system maximum operational mode Little equivalent impedance, current quick scope includes lower bar circuit or the end of power equipment, the action current of protection seting The overload electric current of circuit should be escaped, when supply line's imbalance of three-phase voltage rate is more than target setting, and prolong beyond imbalance Time the time after, controller controls to start Voltage unbalance protection, determines three-phase piezoelectricity unbalance factor, uses and arrange capacitor device Realize, some group capacitor devices are carried out star-star connection mode connection, the voltage power taking case of unstable voltage protection The open delta voltage of group.
Described reactive power compensator, including current transformer and voltage transformer, it is characterised in that described current transformer Connecting with voltage transformer and have phase detection device, described phase detection device connects compensating controller, and described compensation controls Device calculating current transformer and the phase difference value of voltage transformer, determine the power factor of this phase, and described compensating controller is even Being connected to power factor display unit and switching control circuit, described switching control circuit connects switching capacitance group, described voltage Transformer summation current transformer includes A phase transformer, B phase transformer and C phase transformer respectively, and described switching capacitance group includes A Phase electric capacity, B phase electric capacity and C phase electric capacity.
Described phase detection device includes the voltage comparator being connected with voltage transformer and is connected with current transformer I/V transducer, described I/V transducer connect voltage transformer, described voltage transformer connect have phase discriminator, described phase demodulation Circuit count device.
Described switching control circuit includes a zero-voltage detector, and described zero-voltage detector one end by being connected throwing with door Entering order, described connection with door have multivibrator, described zero-voltage detector connects photoelectrical coupler, described photoelectric coupling The other end of device is connected by resistance IGCT, and described IGCT connects impulsive quarantine amplifier, and described power factor shows Show that unit includes LED display unit.
Described compensating controller connects has power circuit, described power circuit to include three terminal regulator, described three-terminal voltage-stabilizing Connecting between input and the earth terminal of device and have the first electric capacity, connecting between the output and ground of described three terminal regulator has Second electric capacity, the input of described three terminal regulator connects power supply by rectification circuit and transformator, and described compensating controller is pre- It is provided with the first valve value rate factor, when according to the collection data of phase detection device, compensating controller determines that this phase power factor is big When this first valve value rate factor, do not compensate；When compensating controller obtains the collection data according to phase detection device When determining this phase power factor less than this first valve value rate factor, compensate.
Compensating controller determines this phase power factor according to the collection data of phase detection device, including simultaneously in system Three-phase voltage, three-phase current are acquired obtaining real-time network signal, after the isolation processing of isolation module, then carry out N point Constant duration obtains voltage and current sequence, obtains the complex discrete sequence about the time, then carries out Fourier's series, then enters Row discrete Fourier changes, and corrects, according to its conjugation, the relation obtaining between voltage, current vector and harmonic wave, is not considering that direct current divides During amount, derive this phase place harmonic voltage and the virtual value of harmonic current, so that it is determined that active power, obtain the power of this phase place because of Number, described compensating controller, according to real-time voltage, electric current, calculates reactive power, determines and needs the idle of compensation, thus root According to default Switching Strategy, the part switching capacitance controlled in switching capacitance group carries out reactive-load compensation.
By reactive power compensator, improve power factor: avoid electromotor to reduce power factor as far as possible and run, prevent to far Side's load conveying is idle causes voltage and power attenuation, should carry out low power factor and limit, i.e. take the most idle at user Indemnifying measure；Improve voltage-regulation: load the change to reactive requirement, the change of supply terminals voltage can be caused, to this change If being adjusted from power end (power plant), some problems can be caused, and the equipment that compensates just plays maintenance supply voltage in regulation In the range of important function；The balance of regulating load: occur in properly functioning when asymmetrical three-phase runs, there will be negative Sequence, zero-sequence component, will produce added losses, make commutator ripple coefficient increase, cause transformator saturated, and compensated equipment is just Unbalanced load can be made to become balanced load；It addition, by estimation prospective short circuit current, and quick-break current value, it is up to shortly Prospective short circuit current achieves auto-cutout protection；Meanwhile, it is additionally provided with Voltage unbalance protection, by the injustice of three-phase piezoelectricity Weighing apparatus rate determines the target setting of imbalance of three-phase voltage rate；The present invention is capable of power distribution protection, it is ensured that the balance of power equipment Run.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.

Claims (10)

1. an electric power monitoring system, including power equipment, it is characterised in that described power equipment connects reactive power compensator With power distribution protective device, described reactive power compensator and power distribution protective device connection have central controller, power distribution protection is utilized to fill Putting the prospective short circuit current of parameter determination power supply unit according to power equipment, power distribution protective device monitors power equipment in real time Running short circuit current, when the operation short circuit current of monitoring reaches prospective short circuit current, and short circuit duration is beyond the first pre-set threshold value Time, utilize short-circuit protector to cut off the power supply of power equipment, compensating controller, according to real-time voltage, electric current, calculates Reactive power, determines and needs the idle of compensation, thus according to default Switching Strategy, controls the part switching in switching capacitance group Electric capacity carries out reactive-load compensation.
Electric power monitoring system the most according to claim 1, it is characterised in that described power distribution protective device, including distribution control Device processed, described distribution controller connects has short-circuit protector, described distribution controller to power according to the parameter determination of power equipment The prospective short circuit current of equipment, described short-circuit protector monitors the operation short circuit current of power equipment in real time, when the operation of monitoring Short circuit current reaches prospective short circuit current, and when short circuit duration exceeds the first pre-set threshold value, is shown by display, and institute State short-circuit protector and cut off the power supply of power equipment.
Electric power monitoring system the most according to claim 2, it is characterised in that short-circuit protector includes automatic circuit and segmentation Device, distribution controller utilizes sectionaliser to realize closing of short circuit current, and distribution controller utilizes automatic circuit to excise short circuit current, weight Clutch pre-set coincidence number of times, when the actual coincidence number of times of switch reaches setting value and switchs board gate-dividing state, then Locking automatic closing, isolated fault circuit, automatic circuit is provided with gap periods, and gap periods is the operation of each deciliter of automatic circuit Time interval, a deciliter operation for sectionaliser is decided by line voltage distribution, and the power supply of switch i.e. separating brake then closes a floodgate after incoming call.
Electric power monitoring system the most according to claim 3, it is characterised in that according to the maximum short circuit current of power equipment, Determining quick-break one sub-value of power equipment, wherein quick-break one sub-value is linear with maximum short circuit current, maximum short circuit current Using and directly maximum transformator is placed in route head end calculating maximum short circuit current, the supply line of described power supply unit connects to be had Protection system to earth, described protection system to earth is when occurring power supply unit to touch shell earth fault, and earth current is set by power supply The earth resistance of standby earth resistance and protection system to earth forms loop, and produces pressure drop on two resistance, reduces power supply and sets On standby shell, institute is with voltage.
Electric power monitoring system the most according to claim 4, it is characterised in that utilize current quick, it is stipulated that in maximum Under the method for operation during three-phase shortcircuit, protection domain is maximum, for lmax, under minimum operational mode during line to line fault, protection domain Minimum, for lmin, wherein, under minimum operational mode, the relative value of fast tripping protection scope meets:
l b = l min l A B × 100 % ≥ ( 15 - 20 ) %
I s e t .1 1 = k r e l 1 I 2 K 3. max
l min = 1 x 1 ( 3 2 × E s I o p . k - X S . m a x )
In formula: K1rel--safety factor；Line end three-phase shortcircuit steady-state current under I2k3.max--maximum operational mode； Iopk--protection device one-off electric current；Es--system reference voltage；Minimum under XS.Max--system maximum operational mode Equivalent impedance, current quick scope includes lower bar circuit or the end of power equipment, and the action current of protection seting should Escape the overload electric current of circuit, when supply line's imbalance of three-phase voltage rate is more than target setting, and beyond uneven time delay After time, controller controls to start Voltage unbalance protection, determines three-phase piezoelectricity unbalance factor, uses and arranges capacitor device in fact Existing, some group capacitor devices are carried out star-star connection mode connection, the voltage power taking case group of unstable voltage protection Open delta voltage.
Electric power monitoring system the most according to claim 5, it is characterised in that described reactive power compensator, mutual including electric current Sensor and voltage transformer, it is characterised in that described current transformer and voltage transformer connect phase detection device, described Phase detection device connects compensating controller, described compensating controller calculating current transformer and the phase contrast of voltage transformer Numerical value, determines the power factor of this phase, and described compensating controller connects power factor display unit and switching control circuit, institute Stating the connection of switching control circuit has switching capacitance group, described voltage transformer summation current transformer to include A phase transformer, B respectively Phase transformer and C phase transformer, described switching capacitance group includes A phase electric capacity, B phase electric capacity and C phase electric capacity.
Electric power monitoring system the most according to claim 6, it is characterised in that described phase detection device includes mutual with voltage Voltage comparator that sensor connects and the I/V transducer that is connected with current transformer, described I/V transducer connection mutual induction of voltage Device, described voltage transformer connects phase discriminator, described phase discriminator enumerator.
Electric power monitoring system the most according to claim 7, it is characterised in that described switching control circuit includes a no-voltage Detector, described zero-voltage detector one end by being connected input order with door, and there is multivibrator described connection with door, described Zero-voltage detector connects photoelectrical coupler, and the other end of described photoelectrical coupler is connected by resistance IGCT, described IGCT connects has impulsive quarantine amplifier, described power factor display unit to include LED display unit.
Electric power monitoring system the most according to claim 8, it is characterised in that described compensating controller connects power supply electricity Road, described power circuit includes three terminal regulator, connects and have the first electricity between input and the earth terminal of described three terminal regulator Holding, connecting between the output and ground of described three terminal regulator has the second electric capacity, and the input of described three terminal regulator leads to Over commutation circuit and transformator connect power supply, and described compensating controller is preset with the first valve value rate factor, works as compensating controller When collection data according to phase detection device determine this phase power factor more than this first valve value rate factor, do not mend Repay；Determine that this phase power factor is less than this first threshold values merit when compensating controller obtains the collection data according to phase detection device During rate factor, compensate.
Electric power monitoring system the most according to claim 9, it is characterised in that compensating controller is according to phase detection device Collection data determine this phase power factor, including being acquired obtaining in real time to three-phase voltage in system, three-phase current simultaneously Network signal, after the isolation processing of isolation module, then carries out N point constant duration and obtains voltage and current sequence, obtain About the complex discrete sequence of time, then carry out Fourier's series, then carry out discrete Fourier change, correct according to its conjugation Relation between voltage, current vector and harmonic wave, when not considering DC component, derives this phase place harmonic voltage and harmonic current Virtual value, so that it is determined that active power, obtain the power factor of this phase place, described compensating controller according to real-time voltage, Electric current, calculates reactive power, determines and needs the idle of compensation, thus according to default Switching Strategy, controls switching capacitance group In part switching capacitance carry out reactive-load compensation.
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CN111194411A (en) * 2017-10-30 2020-05-22 伊顿智能动力有限公司 Method and apparatus for measuring expected short circuit current
CN108183491A (en) * 2017-12-08 2018-06-19 囯网河北省电力有限公司电力科学研究院 User transformers intelligent controlling device, method and system
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CN108879710A (en) * 2018-06-08 2018-11-23 贵州电网有限责任公司凯里供电局 A kind of power distribution network efficiency optimization device and method using reactive compensation
CN109004629A (en) * 2018-07-27 2018-12-14 国网江苏省电力有限公司苏州供电分公司 A kind of ground connection change protection system suitable for low resistance grounding
CN109004531A (en) * 2018-07-27 2018-12-14 国网江苏省电力有限公司苏州供电分公司 A kind of neutral resistance complexes
CN113328516A (en) * 2021-04-26 2021-08-31 国网浙江省电力有限公司营销服务中心 Topology signal sending circuit based on capacitance switching and identification method
CN113328516B (en) * 2021-04-26 2023-09-22 国网浙江省电力有限公司营销服务中心 Topology signal transmitting circuit based on capacitor switching and identification method
CN113991695A (en) * 2021-10-28 2022-01-28 广东电网有限责任公司 Reactive compensation equipment switching method and device
CN113991695B (en) * 2021-10-28 2024-04-30 广东电网有限责任公司 Reactive power compensation equipment switching method and device
CN114200241A (en) * 2021-12-20 2022-03-18 深圳博润缘科技有限公司 Power equipment operation monitoring device and method
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Application publication date: 20161214