CN108983029A - A kind of method of on-line checking electric system battery group open circuit - Google Patents

A kind of method of on-line checking electric system battery group open circuit Download PDF

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Publication number
CN108983029A
CN108983029A CN201810957876.3A CN201810957876A CN108983029A CN 108983029 A CN108983029 A CN 108983029A CN 201810957876 A CN201810957876 A CN 201810957876A CN 108983029 A CN108983029 A CN 108983029A
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CN
China
Prior art keywords
battery
voltage
open circuit
line checking
direct current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201810957876.3A
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Chinese (zh)
Inventor
赵占强
张越峰
路驹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHAANXI YILIAN ELECTRICAL EQUIPMENT CO Ltd
Original Assignee
SHAANXI YILIAN ELECTRICAL EQUIPMENT CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHAANXI YILIAN ELECTRICAL EQUIPMENT CO Ltd filed Critical SHAANXI YILIAN ELECTRICAL EQUIPMENT CO Ltd
Priority to CN201810957876.3A priority Critical patent/CN108983029A/en
Publication of CN108983029A publication Critical patent/CN108983029A/en
Withdrawn legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections

Abstract

The present invention provides a kind of methods of on-line checking electric system battery group open circuit, on-line tuning direct current system charging module exports DC voltage to 220V, and the voltage of direct current system battery group is 236V or more, under normal circumstances, battery group is DC load power supply at this time, busbar voltage is identical as accumulator battery voltage, is greater than 220V;And in the case that battery group is opened a way, battery group is unable to powering load, or the charging module by being adjusted to 220V is load supplying, and busbar voltage is less than 220V.Method of the present invention can be with the open circuit situation of on-line checking battery group, while also ensuring battery group in open circuit by the stability of 220V voltage backing protection system.

Description

A kind of method of on-line checking electric system battery group open circuit
Technical field
The present invention relates to a kind of methods of on-line checking electric system battery group open circuit.
Background technique
Electric system is vulnerabilities scan strong power system, and protects automatic control device ring current from transforming plant DC Power supply.DC power supply be factory, stand safe operation basis, at the crucial moment that factory, station are broken down, DC power supply if there is Failure or exception will cause the badly damaged of main equipment, or even bring disaster to power grid security.So the safety of factory, DC power supply of standing Reliability service provides reliable source of power to protection and its automatic device really, has ensured the safe and reliable operation of power grid.
In recent years, the construction of the enterprises and institutions such as power plant, data center, power station power unit remains hair faster Exhibition, a large amount of DC power supply devices are put into system.Since Lead-acid Battery Technology threshold is low, manufacturing firm is various, product matter Measure it is very different, new equipment network management be particularly important.In the construction of DC power system, battery is bundled to direct current In equipment or integrated power supply, type selecting, the quality of battery are difficult to control, and the producer's product for constantly having poor quality is caused to enter In user's power-supply system, product quality is irregular, and equipment component puts into operation 1 ~ 2 year and occurs as soon as because of Individual cells failure, causes whole Group storage battery cannot be normal.
Battery group open circuit is failure relatively common in direct current system, and most dangerous.Once exchanging power loss, relay protection Circuit loses power supply, cannot reliably separating brake fault loop, will directly bypass the immediate leadership to higher level and protect, and cause no-voltage of entire station.Battery pack Open circuit in two kinds of situation, directly open a way with indirect by open circuit.
It directly opens a way, exactly connects the fuse blows of battery group, but Fuse indicators are not operating, cause system It can't detect.It could also be possible that artificial origin causes fuse not put into, battery pack off-grid.The reason of 618 accident of southern Xi'an City It is exactly direct current system transformation, fuse is in an off state, and battery pack is not put into.When 35kV cable short circuit explosion causes station friendship Trip protection is flowed, direct current cabinet charger exchanges power loss, and battery pack causes direct current decompression simultaneously without investment DC bus, Defencive function is lost.Finally lead to the station southern suburbs 330kV and 8 and is the whole decompressions in the station 110kV, 2 110kV main transformers and 1 330kV master Change is burnt, 2 330kV main transformer failures, and the loss of remaining corollary equipment is not small.
Open circuit indirectly, the pole plate of Individual cells, busbar connector and pole link position seriously corroded are made mainly in battery pack At virtual connection phenomenon, when floating charge low current, it is in connection status, once heavy-current discharge, it is possible to cause battery open circuit, battery pack Decompression.
In recent years because battery group open circuit causes direct current system that cannot provide in time reliable protection when exchanging power loss Power supply and cause that bigger power outage is more and more, very big influence is caused to the work and life of broad masses of the people.
Summary of the invention
In order to eliminate above-mentioned disadvantage, the present invention provides a kind of on-line checking electric system battery group open circuit method, Automatic regularly on-line checking may be implemented and judge whether battery group opens a way, once open circuit situation occurs, Realtime Alerts lead to Know that personnel repair processing.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
Currently, the direct current system in most of electric system is all constantly in floating charge state, normal DC load is by charging cabinet It directly powers, battery is in full power state, and only after the AC power source of charging cabinet disappears, battery is just supplied to DC load Electricity.Under normal floating charge state, the direct current output of charging cabinet is U1=242V, and the DC output voltage U1 of charging cabinet is turned down To 220V, this is also the load voltage value of direct current system, and the voltage U2 that battery group is in full electricity is 236V or more, so, Under normal circumstances, at this point, U2 > U1, DC load is just powered by the higher battery group of voltage, so the electricity on DC bus Pressure U0 is exactly voltage U2, the i.e. U0=U2 of battery group, this is normal operating conditions.
Once battery group is opened a way, when turning down voltage U1 to the 220V of charging cabinet, U2=0 because battery group is opened a way, this When, U1 > U2, DC load is powered by voltage more high charge cabinet, so the voltage U0 on DC bus is exactly the output of charging cabinet Voltage, i.e. U0=U1, thus, it is possible to judge battery pack open circuit.
Specific step is as follows:
Firstly, turning down DC output voltage U1=220V of charging cabinet, it is delayed after 30s, busbar voltage U0 is detected, if U0 > 220V, then battery works normally;If U0≤220V, battery pack open circuit.
On-line checking battery pack open circuit state may be implemented in method of the present invention, can also be according to week time of setting Phase regularly carries out battery pack open circuit detection, can also manually carry out the open circuit detection of battery according to the actual situation.Simply Reliably, once there is the case where battery group open circuit, DC load will not have a power failure, the DC charging cabinet after also turning down Output voltage 220V can guarantee the normal work of load.
The DC output voltage of charging cabinet is turned down to the function of 220V by the high-frequency switching power supply module in DC charging cabinet It completes, the voltage adjusting range of high-frequency switching power supply module is in 176V ~ 280V.After the open circuit detection for completing battery group, high frequency The voltage of switch power module is restored to float charge voltage 242V, restores normal condition.
Acquisition to the DC output voltage and busbar voltage of charging cabinet and comparing is completed by direct current cabinet monitoring host computer, and can To be set by touch screen to relevant parameter.
Detailed description of the invention
Fig. 1 is direct current system schematic diagram.
Fig. 2 is battery group open circuit detection logic chart.
Specific embodiment
The present invention is further elaborated with specific implementation with reference to the accompanying drawing:
Shown in FIG. 1 is direct current system schematic diagram, and charging cabinet, battery group and DC load are both connected on DC bus, one As in the case of, charging cabinet not only powers to DC load and gave battery group floating charging again, supplements the self discharge of battery, and battery group is led to Overcurrent fuse is connected to DC bus.
Charging cabinet is the DC power supply that will be exchanged 380V power supply and be rectified into adjustable-voltage by high-frequency switching power supply module, The effect of diode D is check diode in figure, and the voltage of normal condition Down Highway is more electric than the output of high-frequency switching power supply module Force down the tube voltage drop 0.7V an of diode.
When carrying out the open circuit detection of battery group, the DC output voltage for adjusting high-frequency switching power supply module is 220V, I.e. the anode spot voltage of check diode D is 220V, when battery group is normally connected on DC bus, at this point, in full The voltage of the battery group of electricity condition is because this is 236V or so, so the voltage on DC bus, that is, check diode D cathode point Voltage be also 236V or so, be higher than 220V, so by the 236V voltage powering load of battery group, be delayed after 30s, at this time It is greater than the DC output voltage 220V of high-frequency switching power supply module according to DC bus-bar voltage 236V, can conclude that as at battery group In normal connection status.
When battery group is in direct open-circuit condition, i.e. fuse blows of connection battery group and DC bus or not When investment, at this point, the DC output voltage of adjustment high-frequency switching power supply module is 220V, because battery group is opened a way, DC bus Voltage also can and then drop to 119.3V, the pipe of a diode fewer than the DC output voltage 220V of high-frequency switching power supply module Pressure drop is less than or equal to the DC output voltage of high-frequency switching power supply module according to DC bus-bar voltage, can determine that as battery group In open-circuit condition, alarm, notice operation maintenance personnel processing are issued.
When battery is in indirect open-circuit condition, i.e., corrosion has virtual connection phenomenon inside Individual cells, at this point, adjustment high frequency The DC output voltage of switch power module is 220V, and battery group powering load causes to corrode because load current is larger Part is cracked and is gradually turned off, battery pack open circuit, and DC bus-bar voltage is reduced to 119.3V, consistent with direct open-circuit condition.
Shown in Fig. 2 is that battery group open circuit detection logic chart is turned down straight first when carrying out the open circuit detection of battery group The charging module voltage of streaming system is 220V, is then delayed after 30s, detects to busbar voltage, if it is greater than 220V, then sentence Break for battery group it is normal, otherwise, Alarm accumulator group open-circuit fault.

Claims (4)

1. a kind of method of on-line checking electric system battery group open circuit, which comprises the following steps:
The DC output voltage for adjusting direct current system charging module first is 220V, is delayed after 30s, detects DC bus side voltage Whether it is greater than 220V, is then normally, otherwise abnormal, Alarm accumulator group open-circuit fault.
2. a kind of method of on-line checking electric system battery group open circuit according to claim 1, which is characterized in that straight Streaming system charging module is high-frequency switching power supply module, adjustable voltage range 176V ~ 280V.
3. a kind of method of on-line checking electric system battery group open circuit according to claim 1, which is characterized in that adjust The DC voltage of straightening streaming system charging module is 220V, this voltage value is direct current system rated operational voltage, can guarantee system Normal work.
4. a kind of method of on-line checking electric system battery group open circuit according to claim 1, which is characterized in that inspection Hall voltage sensor is used when surveying DC bus side voltage value.
CN201810957876.3A 2018-08-22 2018-08-22 A kind of method of on-line checking electric system battery group open circuit Withdrawn CN108983029A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810957876.3A CN108983029A (en) 2018-08-22 2018-08-22 A kind of method of on-line checking electric system battery group open circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810957876.3A CN108983029A (en) 2018-08-22 2018-08-22 A kind of method of on-line checking electric system battery group open circuit

Publications (1)

Publication Number Publication Date
CN108983029A true CN108983029A (en) 2018-12-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810957876.3A Withdrawn CN108983029A (en) 2018-08-22 2018-08-22 A kind of method of on-line checking electric system battery group open circuit

Country Status (1)

Country Link
CN (1) CN108983029A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109814039A (en) * 2019-01-10 2019-05-28 中国移动通信集团海南有限公司 A kind of battery group open circuit detection method, device and computer readable storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109814039A (en) * 2019-01-10 2019-05-28 中国移动通信集团海南有限公司 A kind of battery group open circuit detection method, device and computer readable storage medium

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Application publication date: 20181211