CN106646037A - DC system real-time detection method for transformer station - Google Patents
DC system real-time detection method for transformer station Download PDFInfo
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- CN106646037A CN106646037A CN201611070786.XA CN201611070786A CN106646037A CN 106646037 A CN106646037 A CN 106646037A CN 201611070786 A CN201611070786 A CN 201611070786A CN 106646037 A CN106646037 A CN 106646037A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a DC system real-time detection method for a transformer station. The DC system real-time detection method comprises the steps of: enabling a storage battery to operate in a floating charge mode; enabling a control and detection unit to reduce charging voltage and starting a self-detection interruption system; enabling the control and detection unit to detect the storage battery and controlling the on-off state of a storage battery discharge circuit; increasing the charging voltage of the storage battery in order that the storage battery enters an equalizing charge mode. The method strengthens the real-time self-detection of the storage battery and intensifies the connection to a DC system. The self-detection mode of the storage battery can automatically detect the advantages and disadvantages of the storage battery in real time in a normal floating charging operation mode and verify the integrity of the DC circuit through the readings of an ammeter. Compared with a conventional storage battery checking charge and discharge test, the method is safe and reliable, saves time and labor, and prolongs the service life of the storage battery.
Description
Technical field
The present invention relates to substation safety control technology field, more particularly to a kind of direct current for transformer station
System real-time detection method.
Background technology
Straight-flow system is not only that substation relay protection, automatics, control, signal and emergency lighting etc. provide reliable
Dc source, but also provide reliable operation power for daily grid switching operation.Whether reliable it is directly to the safety of transformer station
Operation plays vital effect.
When the whole station decompression of transformer station, charger quits work, batteries as substation safety run it is last together
Barrier, it is very big that can it provide reliable dc source meaning for transformer station, in recent years, occurred a lot of because transformer station's electric power storage
Pond failure and he causes the accidents such as the power failure of whole transformer station whole station, equipment burnout.Therefore, battery is carried out reliable in real time online
Monitoring is significant to whole transformer station even electrical network.
Lead-acid accumulator from 1859 by Pulan spy's invention since, the existing history of more than 150 years so far, technology ten is divided into
It is ripe, it is most popular electrochmical power source on the whole world.Although in recent years nickel-cadmium cell, Ni-MH battery, lithium ion battery etc. are new
Battery is come out one after another and is applied, but lead-acid accumulator is still by heavy-current discharge performance is strong, voltage characteristic steady, temperature
Applied widely, cell capacity is big, safe and abundant raw materials and reproducible utilization, cheap etc. are a series of excellent
Gesture, in occupation of absolute leading position in power system.Valve controlled sealed lead-acid accumulator relies on stable performance, and operation can
By, little maintenance workload, long service life the advantages of, the short several years just almost instead of all changes since the nineties in 20th century
The Traditional DC equipment in power station.
Batteries are manufactured due to technique, service life and the reason such as regular maintenance is improper, are likely to result in storage battery
Situations such as solution liquid evaporation, interior resistive are greatly and capacity reduces, if can not in time find and process, it is possible to battery can be caused to exist
Electric power system fault cannot provide reliable dc source when occurring, it is impossible to coordinate automatics quickly to cut off failure so that causing
The serious consequences such as equipment damage.Therefore verification property charge and discharge electric test periodically must be carried out to it, it is ensured that the capacity of batteries is expired
The requirement of sufficient operation of power networks.《Transforming plant DC operating standard》" new installation batteries should carry out full capacity verification property and fill regulation
Discharge test, capacity reaches 100%；The later every two years once property checked charge and discharge electric test.Operation is entered every year for 4 years later
Row once verification property charge and discharge electric test, capacity need to reach 80% and more than ".
Full checking discharging test can carry out comprehensive, careful inspection to batteries, but need in process of the test
Batteries are exited into straight-flow system.Therefore, can adopt when transformer station is configured with two sets of valve controlled sealed lead-acid accumulator groups
With, when transformer station only has a group storage battery, in order to ensure straight-flow system operation it is safe and reliable, this batteries can not be moved back
Go out straight-flow system operation, full checking discharging test can not be made, can only be after charger be disabled, from batteries to direct current
Load and discharge resistance are powered, and make the checking discharging test of 30%～50% rated capacity.In this case, due to will
Charger logs off, transformer station be short-circuited failure when, if not enough, internal break of accumulator capacity etc. is all likely to result in
The major accidents such as the whole straight-flow system dead electricity of transformer station, relay fail.Therefore, this test method is to testing crew professional standards
Have high demands, to be tested in strict accordance with the method for regulation in process of the test, otherwise very likely because the behaviour of testing crew
Make that method is improper to cause whole streaming system deperssurization emergency of standing erectly.
The terminal voltage value of main monitoring batteries, floating current in the operation of traditional valve-control sealed accumulator group
Value, resistance to earth and state of insulation of magnitude of voltage, batteries and dc bus of every battery etc..It is illustrated in figure 1 list
The straight-flow system of bus wiring, under normal operation, K1, K2 are closing positions, when needs do verification property charge and discharge electric test,
K1 is disconnected, K3 is connected, test recovers after finishing.Operation of the position of K1, K2 and K3 this three groups of disconnecting links to whole straight-flow system rises
Decisive role, but this three groups of disconnecting links usually despise general idea by transformer station's operation maintenance personnel and maintainer, its auxiliary contact
Position signalling is also sent to monitoring backstage and scheduling not over communication interface, and this becomes power train unification monitoring blind area, to change
Electric station DC system stable operation buries deep hidden danger.In August, 2016, in the 330kV transformer station direct current systems of Xi'an due to
Battery is connected to the disconnecting link of the little bus of direct current (such as K2 disconnecting links in Fig. 1) and fails by the correct input of regulation, in transformer station's short circuit event
In the case of barrier, charging device quits work, straight-flow system dead electricity, and relay fail ultimately results in transforming plant main transformer and burns.Therefore,
Real-time online is strengthened " health " management and control of storage batteries of transformer substation and is very important with the integrality of straight-flow system.
The content of the invention
The technical problem to be solved is, for above-mentioned deficiency of the prior art, to disclose a kind of for becoming
The straight-flow system real-time detection method in power station, solves the problems, such as to run in electric power meter management and monitors difficulty.
The technical solution adopted for the present invention to solve the technical problems is：A kind of straight-flow system for transformer station is examined in real time
Survey method, it is characterised in that comprise the following steps：
Battery is electrically run with floating charge；
Control reduces charging voltage with detector unit, starts Autonomous test and interrupts system；
Control is detected with detector unit to battery, and controls the break-make in battery discharging loop；
The charging voltage of battery is raised, battery enters equalizaing charge.
Further, the control reduces charging voltage with detector unit, starts Autonomous test and interrupts system, specifically,
Carry out 5min before equalizaing charge and start Autonomous test interruption system, battery is detected, now charging voltage is reduced into floating charge
The 90% of piezoelectric voltage.
Further, the control is detected with detector unit to battery, and controls the logical of battery discharging loop
It is disconnected；Specifically include：Reversely the output current apparent power of detection battery whether, when reverse, connect and carry out by battery discharging loop
Certain hour constant-current discharge, otherwise sends loop abnormality alarming signal.
Further, the certain hour is 3min.
Further, the control also includes for detecting the cutout detection means that battery stops, institute with detector unit
Cutout detection means is stated by time element, setting time locking, electric current is zero to have not timed out up to reliably motionless during setting value
Make, when reaching setting value, started to monitoring backstage and remote dispatching from discriminating element and send alarm command.
Further, the float charge voltage is 2.23～2.28V/ monomers.
Preferably, the float charge voltage selects to be 2.25V/ monomers.
Further, the equalizaing charge voltage is 2.3～2.4V/ monomers.
Preferably, the equalizaing charge voltage selects 2.35V/ monomers.
The present invention has compared with prior art advantages below：
Present invention enhances itself real-time detection of battery, enhance and contacted with straight-flow system.Battery Autonomous test
Pattern can under normal floating charging working condition automatic real-time detection battery quality, and whether can have by ammeter
Reading verifies the integrality of DC loop.More existing storage battery checking charge and discharge electric test is compared, it is safe and reliable, it is time saving and energy saving.
And the battery Autonomous test cycle is engaged with equalizaing charge, has filled with putting, and accumulator capacity is farthest discharged,
Extend the service life of battery；Battery cutout detection can effectively detect in real time the connection of batteries and straight-flow system
System, when batteries because when any reason departs from straight-flow system, transformer station person on duty or scheduling can be in the very first times
Receive alarm signal, it is ensured that failure can be processed reliably in time.
Description of the drawings
Fig. 1 is the existing straight-flow system detection structure chart that the present invention is mentioned；
Fig. 2 is a kind of straight-flow system real-time detection method flow chart for transformer station proposed by the present invention；
Fig. 3 is the method particular flow sheet described in Fig. 2；
Fig. 4 is the group storage battery group internal resistance isoboles in the embodiment of the present invention；
Fig. 5 is battery proposed by the present invention cutout detection circuit diagram.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment describes the specific embodiment of the invention：
It is a kind of straight-flow system real-time detection method flow process for transformer station proposed by the present invention referring to Fig. 1 to Fig. 3
Figure.
As shown in Figure 1 to Figure 3, a kind of straight-flow system real-time detection method for transformer station, it is characterised in that include with
Lower step：
Battery is electrically run with floating charge；
Control reduces charging voltage with detector unit, starts Autonomous test and interrupts system；
Control is detected with detector unit to battery, and controls the break-make in battery discharging loop；
The charging voltage of battery is raised, battery enters equalizaing charge.
A kind of straight-flow system real-time detection method for transformer station that the present invention is provided, by increasing in straight-flow system
Control and detector unit, detect to the state of battery in the straight-flow system of transformer station, can be with by remote communication interface
The real-time Transmission of data is carried out, in normal operation, battery is electrically run with floating charge, and float charge voltage general control is 2.23
～2.28V/ monomers, float charge voltage is too high, it is too low can all cause accumulator plate sulfuration, active material to loosen so that electric power storage
Tankage diminishes, and shortens battery life, at 25 DEG C, is traditionally arranged to be 2.25V/ monomers.Because battery is using process
The middle non-uniform phenomenon that can be produced, to make it return in the range of regulation, typically carries out at quarterly intervals equalizaing charge, balanced
Charging voltage general control, at 25 DEG C, generally takes 2.35V/ monomers in 2.3～2.4V/ monomers, by arranging straight-flow system reality
When detection method, can automatically control battery carries out the switching of equalizaing charge, it is not necessary to human intervention, it is ensured that in straight-flow system
The normal operation of battery, improves the reliability of electric power system.
Further, the control reduces charging voltage with detector unit, starts Autonomous test and interrupts system, specifically,
Carry out 5min before equalizaing charge and start Autonomous test interruption system, battery is detected, now charging voltage is reduced into floating charge
The 90% of piezoelectric voltage.
Further, the control is detected with detector unit to battery, and controls the logical of battery discharging loop
It is disconnected；Specifically include：Reversely the output current apparent power of detection battery whether, when reverse, connect and carry out by battery discharging loop
Certain hour constant-current discharge, otherwise sends loop abnormality alarming signal.
Further, the certain hour is 3min.
During the normal floating charging of batteries, because floating charging electric current is less, the voltage phase difference of each cell batteries is not
Very big, when battery large current charge, electric discharge, according to Kirchhoff's current law (KCL), the larger battery partial pressure of internal resistance is larger,
Therefore, battery can accurately be monitored by comparing the voltage of batteries each cell batteries under heavy-current discharge pattern
Operating condition.
The internal resistance isoboles of a group storage battery group is illustrated in figure 4, E is the electromotive force of cell batteries, and Zeq is equivalent list
Resistance in vivo.Each cell batteries electromotive force can be approximately considered under normal circumstances equal, i.e.,：
E1=E2=...=En
Accumulator internal resistance is under normal circumstances all in m Ω levels, therefore each accumulator internal resistance partial pressure is less, can approximately recognize
For：
U1=U2=...=Un
When a cell batteries Ei internal resistance Zeqi is bigger than normal in batteries, when batteries are discharged, due to Kiel
Hough effect, its partial pressure is larger, then：
U1=U2=...=Un>Ui
Therefore whether batteries, i.e. differential pressure measurement can be monitored more than setting value by the voltage difference of different batteries
Method：
|Ui-Uj| ＞ Uset(i∈{1,2,…n},j∈{1,2,…n})
When transformer station only has a group storage battery, if happening suddenly transformer station's short circuit and battery when doing checking discharging test
Failure can cause straight-flow system dead electricity.The straight-flow system real-time detection method that the present invention is provided, can be used to remedy such and insufficient,
The automatic detection of battery is realized with safer, simple method.
In the embodiment of the present invention, control is detected with detector unit to battery, and controls battery discharging loop
Break-make；Also include：Whether detection single battery voltage is less than setting value, if being less than setting value, disconnects battery discharging and returns
Road, otherwise sends accumulator internal resistance abnormality alarming signal.
Under normal floating charge pattern, charger provides galvanic current source for dc bus and battery, remains whole and becomes
Self discharge inside the normal DC load and batteries in power station.Battery is connected to the electric current meter reading of dc bus to store
The normal self-discharge current of battery, battery is pointed in direction by dc bus.Electric power storage is made by reducing the charging voltage of charger
Pond is in discharge condition, and according to the requirement of straight-flow system technical regulation, DC bus-bar voltage cannot be below 90%UN, therefore, if
It is 90% DC rated voltage to determine charger voltage, to guarantee straight-flow system stable operation.Then by high precision electro flow table
Power flow direction guarantees that battery, in discharge condition, is then turn on the discharge loop disconnecting link K3 of battery, is put by automatically adjusting
Resistance makes battery be in " constant-current discharge " state.For ease of calculating and analyzing, the electric current of constant-current discharge is set as battery
The nominal discharge current of group, the nominal discharge current automatically adjusts discharge resistance and realizes by device, carries out 3 points of constant-current discharge
Clock, then by leakage measurement method using differential pressure transducer, i.e., according to the terminal voltage of each cell batteries under storage battery constant-current discharge, works as batteries
When voltage difference is more than 0.4V between monomer, i.e., send out alarm signal to backstage and scheduling.Or monitored by direct current method or alternating current method
The now internal resistance of battery, when battery is fully charged and discharges completely, its internal resistance differs 2-4 times or so.With discharge process
Carrying out, internal resistance incrementally increases, and under normal circumstances in m Ω levels, when accumulator capacity is not enough, internal resistance can significantly for the internal resistance of battery
Increase, sometimes even up to Ω levels, therefore can determine whether accumulator capacity meets requirement by detection internal resistance；When there is monomer
When accumulator internal resistance is more than setting value, you can judge that this battery group capacity is unsatisfactory for requiring, need to carry out this batteries
Maintenance and Repair or replacing.
Generally, two electrodes of battery can occur the chemical reactions such as redox, its meeting battery consumption
Active material, reduces the energy of battery, not available heat energy is translated into, we term it the self discharge of battery.
Under batteries floating charge power mode, charger in addition to providing dc source to transforming plant DC load, supplement and store by the also moment
The self discharge of battery pack, to guarantee that the battery group capacity moment meets the requirement that system is normally run.
Batteries self-discharge current size is relevant with accumulator capacity, manufacturing process, operating condition and environment etc., such as schemes
Shown in 5, under the normal floating charge state of battery, the high-precision current that can be connected to by batteries in dc bus loop
Table is obtained.General floating current is 1～3mA/Ah.
As shown in figure 5, when battery disconnecting link K2 people is disconnection, or voluntarily failure tripping and the open circuit of disconnecting link internal fault
When, battery departs from dc bus, and charger no longer provides self-discharge current for batteries, and the reading of ammeter is zero.
Therefore, it can guarantee being closely connected for dc bus and batteries by the method for this cutout detection, in order to ensure can
By precision maneuver, time element, setting time locking are added, electric current is zero to be reliably failure to actuate when having not timed out up to setting value,
When reaching setting value, started to monitoring backstage and remote dispatching from discriminating element and send alarm command, remind operation maintenance personnel or inspection
Repair personnel to eliminate this failure, it is ensured that straight-flow system it is reliable and stable.
Present invention enhances itself real-time detection of battery, enhance and contacted with straight-flow system.Battery Autonomous test
Pattern can under normal floating charging working condition automatic real-time detection battery quality, and whether can have by ammeter
Reading verifies the integrality of DC loop.More existing storage battery checking charge and discharge electric test is compared, it is safe and reliable, it is time saving and energy saving.
And the battery Autonomous test cycle is engaged with equalizaing charge, has filled with putting, and accumulator capacity is farthest discharged,
Extend the service life of battery.
Battery cutout detection can effectively detect in real time contacting for batteries and straight-flow system, when batteries because
When departing from straight-flow system for any reason, transformer station person on duty or scheduling can receive alarm signal in the very first time,
Guarantee that failure can be processed reliably in time.
The preferred embodiment for the present invention is explained in detail above in conjunction with accompanying drawing, but the invention is not restricted to above-mentioned enforcement
Mode, in the ken that those of ordinary skill in the art possess, can be with the premise of without departing from present inventive concept
Make a variety of changes.
Many other changes and remodeling can be made without departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (10)
1. a kind of straight-flow system real-time detection method for transformer station, it is characterised in that comprise the following steps：
Battery is electrically run with floating charge；
Control reduces charging voltage with detector unit, starts Autonomous test and interrupts system；
Control is detected with detector unit to battery, and controls the break-make in battery discharging loop；
The charging voltage of battery is raised, battery enters equalizaing charge.
2. a kind of straight-flow system real-time detection method for transformer station according to claim 1, it is characterised in that described
Control reduces charging voltage with detector unit, starts Autonomous test and interrupts system, specifically, 5min starts before equalizaing charge is carried out
Autonomous test interrupts system, and battery is detected, now charging voltage is reduced into the 90% of float charge voltage.
3. a kind of straight-flow system real-time detection method for transformer station according to claim 1, it is characterised in that described
Control is detected with detector unit to battery, and controls the break-make in battery discharging loop；Specifically include：Detection battery
Output current apparent power whether reversely, when reverse, battery discharging loop is connected and carries out certain hour constant-current discharge, otherwise sends out
Go out loop abnormality alarming signal.
4. a kind of straight-flow system real-time detection method for transformer station according to claim 3, it is characterised in that described
Certain hour is 3min.
5. a kind of straight-flow system real-time detection method for transformer station according to claim 1, it is characterised in that described
Control is detected with detector unit to battery, and controls the break-make in battery discharging loop；Also include：Detection battery list
Whether bulk voltage is less than setting value, if being less than setting value, disconnects battery discharging loop, otherwise sends accumulator internal resistance exception
Alarm signal.
6. a kind of straight-flow system real-time detection method for transformer station according to claim 1, it is characterised in that described
Control also includes that, for detecting the cutout detection means that battery stops, the cutout detection means passes through the time with detector unit
Element, setting time locking, electric current is zero to be reliably failure to actuate when having not timed out up to setting value, when reaching setting value, by differentiating
Element starts to monitoring backstage and remote dispatching transmission alarm command.
7. a kind of straight-flow system real-time detection method for transformer station according to claim 1, it is characterised in that described
Float charge voltage is 2.23～2.28V/ monomers.
8. a kind of straight-flow system real-time detection method for transformer station according to claim 7, it is characterised in that described
Float charge voltage selects to be 2.25V/ monomers.
9. a kind of straight-flow system real-time detection method for transformer station according to claim 1, it is characterised in that described
Equalizaing charge voltage is 2.3～2.4V/ monomers.
10. a kind of straight-flow system real-time detection method for transformer station according to claim 9, it is characterised in that institute
State equalizaing charge voltage and select 2.35V/ monomers.
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| CN107171392A (en) * | 2017-06-19 | 2017-09-15 | 广东电网有限责任公司惠州供电局 | A kind of standby straight-flow system of transformer station |
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| CN107390142A (en) * | 2017-09-13 | 2017-11-24 | 国网黑龙江省电力有限公司佳木斯供电公司 | Transforming plant DC power supply status monitoring system and the method for power supply status monitoring |
| CN108258771A (en) * | 2018-02-09 | 2018-07-06 | 广州泓泉能源科技有限公司 | A kind of online intelligent accummulator core holds straight-flow system |
| CN108387800A (en) * | 2018-03-13 | 2018-08-10 | 深圳市安特智能控制有限公司 | A kind of accumulator group major loop state multidimensional judgment method |
| CN110333418A (en) * | 2019-03-11 | 2019-10-15 | 华电电力科学研究院有限公司 | A kind of battery group disengaging bus online test method |
| CN111044915A (en) * | 2019-06-26 | 2020-04-21 | 荷贝克电源系统（溧阳）有限公司 | Storage battery capacity control system of rail transit vehicle-mounted power system and detection method thereof |
| CN111948548A (en) * | 2020-06-23 | 2020-11-17 | 广东电网有限责任公司 | System for detecting storage battery pack without power interruption |
| CN112526250A (en) * | 2020-10-13 | 2021-03-19 | 国网山东省电力公司莘县供电公司 | Direct current system state integrated monitoring system |
| CN113030747A (en) * | 2021-02-05 | 2021-06-25 | 国网宁夏电力有限公司吴忠供电公司 | Station storage battery pack checking discharge test system |
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| CN107171392A (en) * | 2017-06-19 | 2017-09-15 | 广东电网有限责任公司惠州供电局 | A kind of standby straight-flow system of transformer station |
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| CN108258771A (en) * | 2018-02-09 | 2018-07-06 | 广州泓泉能源科技有限公司 | A kind of online intelligent accummulator core holds straight-flow system |
| CN108387800B (en) * | 2018-03-13 | 2020-04-10 | 深圳市安特智能控制有限公司 | Multi-dimensional judgment method for main loop state of storage battery pack |
| CN108387800A (en) * | 2018-03-13 | 2018-08-10 | 深圳市安特智能控制有限公司 | A kind of accumulator group major loop state multidimensional judgment method |
| CN110333418A (en) * | 2019-03-11 | 2019-10-15 | 华电电力科学研究院有限公司 | A kind of battery group disengaging bus online test method |
| CN111044915A (en) * | 2019-06-26 | 2020-04-21 | 荷贝克电源系统（溧阳）有限公司 | Storage battery capacity control system of rail transit vehicle-mounted power system and detection method thereof |
| CN111948548A (en) * | 2020-06-23 | 2020-11-17 | 广东电网有限责任公司 | System for detecting storage battery pack without power interruption |
| CN112526250A (en) * | 2020-10-13 | 2021-03-19 | 国网山东省电力公司莘县供电公司 | Direct current system state integrated monitoring system |
| CN113030747A (en) * | 2021-02-05 | 2021-06-25 | 国网宁夏电力有限公司吴忠供电公司 | Station storage battery pack checking discharge test system |
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