CN105823954A - Detection device for grounding point of storage battery pack, method and DC power supply system - Google Patents
Detection device for grounding point of storage battery pack, method and DC power supply system Download PDFInfo
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- CN105823954A CN105823954A CN201510006007.9A CN201510006007A CN105823954A CN 105823954 A CN105823954 A CN 105823954A CN 201510006007 A CN201510006007 A CN 201510006007A CN 105823954 A CN105823954 A CN 105823954A
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a detection device for a grounding point of a storage battery pack, a method and a DC power supply system. The detection device comprises an inspection device, a current detector, a voltage detector, a branch circuit, an on-off controller and a calculation controller, and is characterized in that the current detector detects current flowing through the grounding point; the voltage detector detects voltage to the ground of a closing bus; the branch circuit comprises two balance bridge resistors, two detection bridge resistors, a first switch and a second switch, wherein one end of one balance bridge resistor is connected to a positive terminal of the closing bus, one end of the other balance bridge resistor is connected to a negative terminal of the closing bus, and the other ends of the two balance bridge resistors are grounded; one end of one detection bridge resistor is connected to the positive terminal of the closing bus, one end of the other detection bridge resistor is connected to the negative terminal of the closing bus, and the other ends of the two detection bridge resistors are grounded by the first switch and the second switch respectively; the on-off controller controls on-off conditions of the first switch and the second switch; and the calculation controller calculates grounding voltage Ux of the closing bus to the grounding point according to the measurement parameters measured by the current detector and the voltage detector. The detection device for the grounding point of the storage battery pack, the method and the DC power supply system can determine the grounding point position of the storage battery pack, and thus fault positioning can be realized conveniently.
Description
Technical field
The present invention relates to the detection device and method of a kind of accumulator battery earth point, DC power system.
Background technology
Direct current power source portion in power system is made up of equipment such as accumulator battery, charger, direct current cabinets.Straight-flow system is control in power plant and transformer station, signal, relay protection, automaton, telecontrol communication device etc. provide reliably DC source, and provide emergency lighting power supply.It can be also that operation offer operates power supply reliably.Straight-flow system whether reliable, the safe operation to power plant, transformer station plays vital effect, is power plant and guarantee that substation safety runs.
Along with popularizing of microcomputer insulation monitoring and warning device, and along with power transformation amount automatization, no supervision degree are the highest, the technology of microcomputer insulating monitor is required higher, the notice that particularly National Energy Board " prevents 25 important requirements (state can safety [2014] 161) of power generation fault " about printing and distributing is pointed out to need microcomputer insulating monitor to the Insulation monitoring of accumulator battery and the judgement of insulation fall trouble point, the end.The insulating ground fault harm that other feeder lines of straight-flow system are exported by the insulation resistance fall end of accumulator battery is the same.
Power plant, transformer station direct current system ground connection are a kind of being susceptible to and the fault bigger to power system hazardness.In DC ground fault, endangering bigger is two points ground fault, is likely to result in serious consequence.Straight-flow system plus earth; just have the possibility causing protective relaying maloperation; because general breaking coil (such as outlet auxiliary reclay coil and breaking coil etc.) all connects power cathode, loop occurs ground connection or defective insulation will form two points ground fault again, causes false protection；Straight-flow system minus earth; if loop has one point earth again, form two points ground fault and trip(ping) circuit or closing circuit short circuit can be caused relay protection, signal, automaton malfunction or tripping; or cause DC insurance to fuse, make protection and automaton, control loop lose power supply.Homopolarity two points ground fault in complicated protective loop, it is also possible to by some relay short circuit, it is impossible to tripping operation causes relay fail, causes tripping operation of bypassing the immediate leadership.
Triangular web grounding alarm function that at present straight-flow system Insulation monitoring technology is and manually draw the technology of road searching ground connection, it is impossible to being accurately determined the particular location of accumulator battery earth point, this brings the biggest inconvenience to breakdown judge.
Summary of the invention
The technical problem to be solved in the present invention is, it is provided that the detection device and method of a kind of accumulator battery earth point, DC power system.
The technical solution adopted for the present invention to solve the technical problems is: provide the detection device of a kind of accumulator battery earth point, it is applied to DC power system, described DC power system includes closing bus bar and accesses described closing bus bar and include with the accumulator battery being charged, described detection device
Abnormal and export the detector of the first testing result for patrolling and examining out described accumulator battery earth point earth resistance over the ground on described closing bus bar；
Detect the amperometric of flow through electric current on described earth point；
Detect the voltage detector of described closing bus bar voltage-to-ground；
The subcircuits of described accumulator battery it is connected to by described closing bus bar, described subcircuits includes two balance bridge resistance, two detection resistor bridges, the first switch and second switches, wherein, one end of two described balance bridge resistance is connected to the positive and negative terminal of described closing bus bar, the equal ground connection of the other end；One end of two described detection resistor bridges connects the positive and negative terminal of described closing bus bar respectively, and the other end is respectively by described first switch and described second switch ground connection；
Optionally control described first switch according to described first testing result and described second switch opens the switch controller of Guan Bi situation；And
The described closing bus bar computing controller to the ground voltage Ux of described earth point is calculated according to the measurement parameter measured by described amperometric, described voltage detector.
Preferably, described switch controller controls described subcircuits respectively and is in the first circuit state and second circuit state, described first circuit state is that described first switch closes, described second switch is opened, and described second circuit state is that described first switch is opened, described second switch closes；Described measurement parameter includes that the second voltage U2 and the second electric current I2 recorded under the first voltage U1 recorded under described first circuit state and the first electric current I1 and described second circuit state, described ground voltage Ux are calculated by formula (1):
Preferably, described computing controller calculates described earth point earth resistance Rx over the ground always according to formula (2):
Preferably, described first voltage U1 and described second voltage U2 is described closing bus bar anode magnitude of voltage over the ground；Or, described first voltage U1 and described second voltage U2 is described closing bus bar negative terminal magnitude of voltage over the ground.
Also provide for a kind of accumulator battery earth point detection method, carry out accumulator battery earth point detection by detection device, comprise the steps:
S1: patrol and examine on described closing bus bar, if detecting, described accumulator battery earth point earth resistance over the ground is abnormal, then perform step S2；
S2: close described first switch, open described second switch, record the first electric current I1 flow through on described closing bus bar the first voltage U1 over the ground and the most described earth point；
S3: open described first switch, close described second switch, record the second electric current I2 flow through on described closing bus bar the second voltage U2 over the ground and the most described earth point；
S4: calculate ground voltage Ux by formula (1):
Preferably, step S5 is also included: calculate earth resistance Rx by formula (2):
Preferably, described first voltage U1 and described second voltage U2 is described closing bus bar anode magnitude of voltage over the ground；Or, described first voltage U1 and described second voltage U2 is described closing bus bar negative terminal magnitude of voltage over the ground.
Preferably, described first voltage U1 and described second voltage U2 is all in time connecing measured by described closing bus bar anode, further comprising the steps of: and start to measure magnitude of voltage from described accumulator battery positive pole, until measuring current voltage value when being described ground voltage Ux, determining that current location is described earth point；Or, described first voltage U1 and described second voltage U2 is all in time connecing measured by described closing bus bar negative terminal, further comprising the steps of: and start to measure magnitude of voltage from described accumulator battery negative pole, until measuring current voltage value when being described ground voltage Ux, determining that current location is described earth point.
Preferably, the cell voltage value Uo in described accumulator battery is calculated also by formula (3):
Wherein, Ua is the positive terminal voltage value of described closing bus bar, and Ub is described closing bus bar negative terminal voltage value, and K is the accumulator quantity in described accumulator battery；
Then, described earth point position is determined according to the proportionate relationship of Ux Yu Uo.
Also provide for a kind of DC power system, including
Accumulator battery；
Control bus and control feed out branch road；
Closing bus bar and combined floodgate feed out branch road；And
Extremely thus the detection device of accumulator battery earth point detection is carried out for patrolling and examining out described accumulator battery earth point earth resistance over the ground during described closing bus bar is patrolled and examined.
Enforcement the invention has the beneficial effects as follows: the detection device and method of the accumulator battery earth point of the present invention, DC power system can calculate the closing bus bar ground voltage Ux to earth point according to the measurement parameter measured by amperometric and voltage detector, so that it is determined that go out the earth point position of accumulator battery, it is simple to fault location.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the module diagram of the detection device of accumulator battery earth point in some embodiments of the invention；
Fig. 2 is the module diagram of DC power system in some embodiments of the invention；
Fig. 3 is the circuit diagram of subcircuits in Fig. 1；
Fig. 4 is the circuit diagram that in Fig. 3, subcircuits is in the first circuit state；
Fig. 5 is the circuit diagram that in Fig. 3, subcircuits is in second circuit state；
Fig. 6 is the schematic flow sheet of accumulator battery earth point detection method in some embodiments of the invention.
Detailed description of the invention
In order to be more clearly understood from the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing describes the detailed description of the invention of the present invention in detail.
Fig. 1 shows the detection device 100 of the accumulator battery earth point in some embodiments of the invention, for accumulator battery 600 is carried out earth point detection, is applied to DC power system.Shown in Fig. 2, DC power system includes that control bus KM and control feed out branch road 200, closing bus bar HM and combined floodgate and feeds out branch road 400, accumulator battery 600, wherein, control to feed out branch road 200 and connect control bus KM to obtain power supply, combined floodgate feeds out branch road 400 and connects closing bus bar HM to obtain power supply, and accumulator battery 600 is connected to the positive and negative two ends of closing bus bar HM to be charged.Accumulator battery 600 normal operating condition is at floating charge state, and the time of 99.9% of i.e. basically reaching runs on accumulator floating charge state accumulator battery 600 small area analysis and supplements.In DC power system, accumulator battery 600 is equivalent to load, is i.e. equivalent on closing bus bar HM one and feeds out branch road.Accumulator battery 600 discharge condition is only at Maintenance and Repair and system dead electricity, starting storage battery group 600 stand-by power supply, and this kind of situation need not detect the detection of accumulator battery 600 insulating ground.Detection device 100 includes main frame 80, detector 10, amperometric 60, voltage detector 40, subcircuits 30, switch controller 20 and computing controller 50.Detector 10, voltage detector 40, subcircuits 30, switch controller 20 and the computing controller 50 being sequentially connected with is set in main frame 80, and amperometric 60 can be located in main frame 80, it is also possible to be positioned at outside main frame 80.Amperometric 60 connects subcircuits 30 and computing controller 50 respectively.
Wherein, detector 10 is used for, on closing bus bar HM, control is fed out branch road 200, combined floodgate feeds out branch road 400 and accumulator battery 600 is patrolled and examined, when patrolling and examining out accumulator battery 600 earth point earth resistance exception over the ground, output represents the first testing result of accumulator battery 600 abnormal conditions.As selection, it can be that timing is patrolled and examined that detector 10 carries out patrolling and examining on closing bus bar HM, or patrols and examines in real time.If detecting, accumulator battery 600 earth point earth resistance over the ground is normal, then continue executing with follow-up patrolling and examining.
Shown in Fig. 3, subcircuits 30 is connected to accumulator battery 600 by closing bus bar HM.Subcircuits 30 includes two balance bridge resistance Rb1, two detection resistor bridge Rp1, the first switch K1, second switch K2 and DC source DC.Wherein, one end of two balance bridge resistance Rb1 is connected to the positive and negative terminal of closing bus bar HM, the equal ground connection of the other end.One end of two detection resistor bridge Rp1 connects the positive and negative terminal of closing bus bar HM respectively, and the other end is respectively by the first switch K1 and second switch K2 ground connection.DC source DC two ends are connected to the positive and negative terminal of closing bus bar HM.By the standard of present National Energy Board, in 220VDC system, two balance bridge resistance Rb1 spans are 30K～60K.Two detection resistor bridge Rp1 are used for carrying out current/voltage detection, i.e. uneven resistor bridge herein.U+ represents closing bus bar HM positive voltage-to-ground value；U-represents that closing bus bar HM bears voltage-to-ground value；Ux represents accumulator battery 600 inner ground point terminal voltage positive to closing bus bar HM, for unknown number；Rx represents internal storage battery insulating ground resistance, for unknown number；I represents earth leakage stream.
The mathematic(al) mode can set up with the earth for equipotential in figure 3 is as formula (4):
The most as depicted in figs. 1 and 2, amperometric 60 is used for detecting flow through electric current on earth point.Preferably, detector 10 is multiple Weak current sensors, and each detector 10 is separately positioned on and control feeds out branch road 200, closing a floodgate feeds out in branch road 400 and accumulator battery 600, is i.e. arranged at main frame 80 outside.As selection, detector 10 may also set up in main frame 80 internal.Voltage detector 40 is used for detecting closing bus bar HM voltage-to-ground.
Switch controller 20 is connected with detector 10, and receives the first testing result that detector 10 sends.Switch controller 20 optionally controls the first switch K1 and second switch K2 according to the first testing result and opens Guan Bi situation.When comprising the information not detecting accumulator battery 600 ground connection in the first testing result, switch controller 20 does not carry out corresponding operating.When comprising the information detecting accumulator battery 600 ground connection in the first testing result, switch controller 20 proceeds by corresponding operating.Specifically, switch controller 20 controlling brancher circuit 30 respectively is in the first circuit state and second circuit state, and the first circuit state is that the first switch K1 closes, second switch K2 opens, and second circuit state is that the first switch K1 opens, second switch K2 closes.
Computing controller 50 is connected with voltage detector 40 and amperometric 60, and receives the two measurement parameter sent.Measure the second voltage U2 and the second electric current I2 that parameter includes recording under the first voltage U1 recorded under the first circuit state and the first electric current I1 and second circuit state.First voltage U1 and the second voltage U2 is closing bus bar HM anode magnitude of voltage over the ground；Or, the first voltage U1 and the second voltage U2 is closing bus bar HM negative terminal magnitude of voltage over the ground.Preferably, in the present embodiment, the first voltage U1 and the second voltage U2 is closing bus bar HM anode magnitude of voltage over the ground.
Computing controller 50 calculates the closing bus bar HM ground voltage Ux to earth point according to the measurement parameter measured by amperometric 60, voltage detector 40.
Ground voltage Ux is calculated by formula (1):
As selection, computing controller 50 calculates earth point earth resistance Rx over the ground always according to formula (2):
Below the derivation principle of formula (1) and formula (2) is illustrated:
As shown in Figure 4, the equivalent circuit diagram of second circuit state is as shown in Figure 5 for the equivalent circuit diagram of the first circuit state.
As shown in Figure 4, under the first circuit state, second switch K2 opens, the first switch K1 Guan Bi, and amperometric 60 detects flow through electric current I1 on earth point, and voltage detector 40 detects closing bus bar HM voltage-to-ground U1.The relation of following I1 and U1 can be drawn according to formula (4):
As it is shown in figure 5, under second circuit state, the first switch K1 opens, second switch K2 Guan Bi, amperometric 60 detects flow through electric current I2 on earth point, and voltage detector 40 detects closing bus bar HM voltage-to-ground U2.The relation of following I2 and U2 can be drawn according to formula (4):
According to formula (5) and formula (6), can calculate:
Calculate ground voltage Ux, then can find out corresponding earth point in accumulator battery 600 according to voltage condition.As selection, after obtaining ground voltage Ux according to formula (1), the earth point in accumulator battery 600 is positioned.Location mode includes following three kinds of embodiments: 1, the first voltage U1 and the second voltage U2 is all in time connecing measured by closing bus bar HM anode, localization method includes step: start to measure magnitude of voltage from accumulator battery 600 positive pole, until measuring current voltage value when being ground voltage Ux, determine that current location is earth point.Or, 2, the first voltage U1 and the second voltage U2 is all in time connecing measured by closing bus bar HM negative terminal, localization method includes step: start to measure magnitude of voltage from accumulator battery 600 negative pole, until measuring current voltage value when being ground voltage Ux, determines that current location is earth point.Or, 3, calculated the cell voltage value Uo in accumulator battery 600 by formula (3):
Wherein, Ua is the positive terminal voltage value of closing bus bar HM, and Ub is closing bus bar HM negative terminal voltage value, and K is the accumulator quantity in accumulator battery 600；Then, earth point position is determined according to the proportionate relationship of Ux Yu Uo.
It should be noted that, above-mentioned three kinds of embodiments can be realized by manual operation, it is possible to is realized by a hardware unit, controls to realize also by a software, is not specifically limited herein.
As Fig. 6 shows accumulator battery earth point detection method in some embodiments of the invention, carry out the detection of accumulator battery 600 earth point by above-described embodiment detects device 100, comprise the steps S1 to S5.
Shown in Fig. 1 and Fig. 2, in step S1, first, patrolling and examining on closing bus bar HM, if detecting, accumulator battery 600 earth point earth resistance over the ground is abnormal, then perform step S2.Preferably, in this step, carrying out patrolling and examining on closing bus bar HM can be that timing is patrolled and examined, or patrols and examines in real time.If detecting, accumulator battery 600 earth point earth resistance over the ground is normal, then continue executing with follow-up patrolling and examining.
In step S2, Guan Bi the first switch K1, opens second switch K2, records closing bus bar HM the first voltage U1 over the ground and the first electric current I1 now flow through on earth point.In step S3, open the first switch K1, close second switch K2, record closing bus bar HM the second voltage U2 over the ground and the second electric current I2 now flow through on earth point.Thus obtained by step S2 and step S3 and perform parameter U1 of step S4, I1, U2, I2.Wherein, the first voltage U1 and the second voltage U2 is closing bus bar HM anode magnitude of voltage over the ground；Or, the first voltage U1 and the second voltage U2 is closing bus bar HM negative terminal magnitude of voltage over the ground.Preferably, in the present embodiment, the first voltage U1 and the second voltage U2 is closing bus bar HM anode magnitude of voltage over the ground.
In step s 4, ground voltage Ux is calculated by formula (1):
In step S5: calculate earth resistance Rx by formula (2):
About formula (1) and the derivation of formula (2), can be referring to the derivation algorithm in the accumulator battery 600 ground connection point detection device 100 of the above embodiment of the present invention.
After obtaining ground voltage Ux according to formula (1), the earth point in accumulator battery 600 is positioned.Location mode includes following three kinds of embodiments: 1, the first voltage U1 and the second voltage U2 is all in time connecing measured by closing bus bar HM anode, localization method includes step: start to measure magnitude of voltage from accumulator battery 600 positive pole, until measuring current voltage value when being ground voltage Ux, determine that current location is earth point.Or, 2, the first voltage U1 and the second voltage U2 is all in time connecing measured by closing bus bar HM negative terminal, localization method includes step: start to measure magnitude of voltage from accumulator battery 600 negative pole, until measuring current voltage value when being ground voltage Ux, determines that current location is earth point.Or, 3, calculated the cell voltage value Uo in accumulator battery 600 by formula (3):
Wherein, Ua is the positive terminal voltage value of closing bus bar HM, and Ub is closing bus bar HM negative terminal voltage value, and K is the accumulator quantity in accumulator battery 600；Then, earth point position is determined according to the proportionate relationship of Ux Yu Uo.
It should be noted that, above-mentioned three kinds of embodiments can be realized by manual operation, it is possible to is realized by a hardware unit, controls to realize also by a software, is not specifically limited herein.
Fig. 2 shows the DC power system in some embodiments of the invention, branch road 200 is fed out including control bus KM and control, closing bus bar HM and combined floodgate feed out branch road 400, detection device 100 in accumulator battery 600 and above-described embodiment, wherein, control to feed out branch road 200 and connect control bus KM to obtain power supply, combined floodgate feeds out branch road 400 and connects closing bus bar HM to obtain power supply, accumulator battery 600 is connected to the positive and negative two ends of closing bus bar HM to be charged, detection device 100 connects closing bus bar HM respectively, control bus KM, control to feed out branch road 200, combined floodgate feeds out branch road 400 and accumulator battery 600.Detection device 100 extremely thus carries out the detection of accumulator battery 600 earth point for patrolling and examining out accumulator battery 600 earth point earth resistance over the ground during patrolling and examining closing bus bar HM.Preferably, closing bus bar HM and control bus KM negative terminal altogether.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for those skilled in the art, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. the detection device of an accumulator battery earth point, it is applied to DC power system, described DC power system includes closing bus bar (HM) and accesses described closing bus bar (HM) with the accumulator battery (600) being charged, it is characterized in that, described detection device includes
Abnormal and export the detector (10) of the first testing result for patrolling and examining out described accumulator battery (600) earth point earth resistance over the ground on described closing bus bar (HM)；
Detect the amperometric (60) of flow through electric current on described earth point；
Detect the voltage detector (40) of described closing bus bar (HM) voltage-to-ground；
The subcircuits (30) of described accumulator battery (600) it is connected to by described closing bus bar (HM), described subcircuits (30) includes two balance bridge resistance (Rb1), two detections resistor bridge (Rp1), the first switch (K1) and second switches (K2), wherein, one end of two described balance bridge resistance (Rb1) is connected to the positive and negative terminal of described closing bus bar (HM), the equal ground connection of the other end；One end of two described detection resistor bridges (Rp1) connects the positive and negative terminal of described closing bus bar (HM) respectively, and the other end is respectively by described first switch (K1) and described second switch (K2) ground connection；
Optionally control described first switch (K1) according to described first testing result and described second switch (K2) opens the switch controller (20) of Guan Bi situation；And
The described closing bus bar (HM) computing controller (50) to the ground voltage Ux of described earth point is calculated according to the measurement parameter measured by described amperometric (60), described voltage detector (40).
Detection device the most according to claim 1, it is characterized in that, described switch controller (20) controls described subcircuits (30) respectively and is in the first circuit state and second circuit state, described first circuit state is that described first switch (K1) closes, described second switch (K2) is opened, and described second circuit state is that described first switch (K1) is opened, described second switch (K2) closes；Described measurement parameter includes that the second voltage U2 and the second electric current I2 recorded under the first voltage U1 recorded under described first circuit state and the first electric current I1 and described second circuit state, described ground voltage Ux are calculated by formula (1):
Detection device the most according to claim 2, it is characterised in that described computing controller (50) calculates described earth point earth resistance Rx over the ground always according to formula (2):
4. according to the detection device described in Claims 2 or 3, it is characterised in that described first voltage U1 and described second voltage U2 is described closing bus bar (HM) anode magnitude of voltage over the ground；Or, described first voltage U1 and described second voltage U2 is described closing bus bar (HM) negative terminal magnitude of voltage over the ground.
5. the detection method of an accumulator battery earth point, it is characterised in that carry out accumulator battery earth point detection by the detection device (100) described in any one of Claims 1-4, comprise the steps:
S1: patrol and examine on described closing bus bar (HM), if detecting, described accumulator battery (600) earth point earth resistance over the ground is abnormal, then perform step S2；
S2: close described first switch (K1), open described second switch (K2), record the first electric current I1 flow through on described closing bus bar (HM) the first voltage U1 over the ground and the most described earth point；
S3: open described first switch (K1), close described second switch (K2), record the second electric current I2 flow through on described closing bus bar (HM) the second voltage U2 over the ground and the most described earth point；
S4: calculate ground voltage Ux by formula (1):
Detection method the most according to claim 5, it is characterised in that also include step S5: calculate earth resistance Rx by formula (2):
Detection method the most according to claim 5, it is characterised in that described first voltage U1 and described second voltage U2 is described closing bus bar (HM) anode magnitude of voltage over the ground；Or, described first voltage U1 and described second voltage U2 is described closing bus bar (HM) negative terminal magnitude of voltage over the ground.
Detection method the most according to claim 7, it is characterized in that, described first voltage U1 and described second voltage U2 is all in time connecing measured by described closing bus bar (HM) anode, further comprise the steps of: and start to measure magnitude of voltage from described accumulator battery (600) positive pole, until measuring current voltage value when being described ground voltage Ux, determine that current location is described earth point；Or, described first voltage U1 and described second voltage U2 is all in time connecing measured by described closing bus bar (HM) negative terminal, further comprise the steps of: and start to measure magnitude of voltage from described accumulator battery (600) negative pole, until measuring current voltage value when being described ground voltage Ux, determine that current location is described earth point.
Detection method the most according to claim 7, it is characterised in that calculate the cell voltage value Uo in described accumulator battery (600) also by formula (3):
Wherein, Ua is the positive terminal voltage value of described closing bus bar (HM), and Ub is described closing bus bar (HM) negative terminal voltage value, and K is the accumulator quantity in described accumulator battery (600)；
Then, described earth point position is determined according to the proportionate relationship of Ux Yu Uo.
10. a DC power system, it is characterised in that include
Accumulator battery (600)；
Control bus (KM) and control feed out branch road (200)；
Closing bus bar (HM) and combined floodgate feed out branch road (400)；And
Described in any one of Claims 1-4, abnormal thus carry out the detection device (100) of accumulator battery (600) earth point detection for patrolling and examining out described accumulator battery (600) earth point earth resistance over the ground during described closing bus bar (HM) is patrolled and examined.
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| CN108845220A (en) * | 2018-06-28 | 2018-11-20 | 广州优维电子科技有限公司 | A kind of battery system ground fault detection device and method |
| CN110579691A (en) * | 2019-03-29 | 2019-12-17 | 珠海瑞特电气设备有限公司 | Storage battery pack insulation descending positioning monitoring device and method |
| CN111103508A (en) * | 2018-10-26 | 2020-05-05 | 上海汽车集团股份有限公司 | Single-point insulation fault positioning calculation method and system |
| CN111817284A (en) * | 2020-09-04 | 2020-10-23 | 深圳市永联科技股份有限公司 | Direct current bus communication circuit and method |
| CN114039342A (en) * | 2021-12-03 | 2022-02-11 | 广西电网有限责任公司钦州供电局 | DC equipment inspection device in DC power supply system |
| CN114167229A (en) * | 2021-11-12 | 2022-03-11 | 广西电网有限责任公司柳州供电局 | Test power supply insulation fault monitoring and searching system and method |
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Cited By (7)
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| CN108845220A (en) * | 2018-06-28 | 2018-11-20 | 广州优维电子科技有限公司 | A kind of battery system ground fault detection device and method |
| CN108845220B (en) * | 2018-06-28 | 2020-09-01 | 广州优维电子科技有限公司 | Battery system ground fault detection device and method |
| CN111103508A (en) * | 2018-10-26 | 2020-05-05 | 上海汽车集团股份有限公司 | Single-point insulation fault positioning calculation method and system |
| CN110579691A (en) * | 2019-03-29 | 2019-12-17 | 珠海瑞特电气设备有限公司 | Storage battery pack insulation descending positioning monitoring device and method |
| CN111817284A (en) * | 2020-09-04 | 2020-10-23 | 深圳市永联科技股份有限公司 | Direct current bus communication circuit and method |
| CN114167229A (en) * | 2021-11-12 | 2022-03-11 | 广西电网有限责任公司柳州供电局 | Test power supply insulation fault monitoring and searching system and method |
| CN114039342A (en) * | 2021-12-03 | 2022-02-11 | 广西电网有限责任公司钦州供电局 | DC equipment inspection device in DC power supply system |
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| CN105823954B (en) | 2023-04-18 |
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