CN105823954B - Detection device and method for grounding point of storage battery pack and direct-current power supply system - Google Patents
Detection device and method for grounding point of storage battery pack and direct-current power supply system Download PDFInfo
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- CN105823954B CN105823954B CN201510006007.9A CN201510006007A CN105823954B CN 105823954 B CN105823954 B CN 105823954B CN 201510006007 A CN201510006007 A CN 201510006007A CN 105823954 B CN105823954 B CN 105823954B
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Abstract
The invention discloses a detection device and a detection method for a grounding point of a storage battery pack and a direct-current power supply system, wherein the detection device comprises a polling device; a current detector for detecting a current flowing through the ground point; a voltage detector for detecting the voltage to ground of the closing bus; the branch circuit comprises two balance bridge resistors, two detection bridge resistors, a first switch and a second switch, wherein one ends of the two balance bridge resistors are respectively connected to the positive end and the negative end of the closing bus, and the other ends of the two balance bridge resistors are grounded; one ends of the two detection bridge resistors are respectively connected with the positive end and the negative end of the switching-on bus, and the other ends of the two detection bridge resistors are respectively grounded through the first switch and the second switch; the switch controller controls the opening and closing conditions of the first switch and the second switch; and the calculation controller is used for calculating the grounding voltage Ux of the butt joint place of the closing bus according to the measurement parameters measured by the current detector and the voltage detector. The detection device and method for the grounding point of the storage battery pack and the direct-current power supply system can determine the position of the grounding point of the storage battery pack, and facilitate fault location.
Description
Technical Field
The invention relates to a detection device and method for a grounding point of a storage battery pack and a direct-current power supply system.
Background
The DC power supply part in the power system consists of a storage battery pack, charging equipment, a DC screen and other equipment. Dc systems provide reliable dc power for control, signaling, relay protection, automation, telemechanical communication devices, etc. in power plants and substations, as well as emergency lighting power. It can also provide a reliable operating power source for operation. The reliability of the direct current system plays an important role in the safe operation of the power plant and the transformer substation, and the direct current system is used for ensuring the safe operation of the power plant and the transformer substation.
Along with the popularization of microcomputer insulation monitoring devices and along with the higher automation of transformer quantity and the higher degree of unsupervised supervision, the technical requirements on the microcomputer insulation monitor are higher, and especially, the notification of twenty-five key requirements for preventing power production faults (national safety 2014 161) issued by the national energy agency indicates that the microcomputer insulation monitor is required to perform insulation detection on a storage battery pack and judge an insulation bottoming fault point. The insulation resistance of the storage battery pack is reduced to the same extent as the damage to the insulation ground fault output by other feeder lines of the direct current system.
The direct current system grounding of a power plant and a transformer substation is a fault which is easy to occur and has great harmfulness to a power system. In the direct current grounding fault, two-point grounding is a serious problem. The positive pole of the direct current system is grounded, so that relay protection misoperation can be caused, because a common tripping coil (such as an outlet intermediate relay coil, a tripping coil and the like) is connected with the negative pole of a power supply, a circuit is grounded again or has poor insulation, two points of grounding can be formed, and protection misoperation is caused; if there is one point in the circuit, the two points can short circuit the tripping circuit or closing circuit to cause relay protection, signal, automatic device malfunction or failure, or to cause the direct current fuse to fuse, so the protection and automatic device, control circuit lose power. In a complex protection loop, two points of the same pole are grounded, and some relays can be shorted, so that the relay cannot trip to cause protection rejection, and override trip is caused.
The existing direct current system insulation detection technology has a single system grounding alarm function and a manual pulling and grounding searching technology, and cannot accurately determine the specific position of the grounding point of the storage battery pack, so that great inconvenience is brought to fault judgment.
Disclosure of Invention
The invention aims to provide a detection device and a detection method for a grounding point of a storage battery pack and a direct-current power supply system.
The technical scheme adopted by the invention for solving the technical problems is as follows: the detection device comprises a closing bus and a storage battery connected to the closing bus for charging
The inspection device is used for inspecting the abnormity of the grounding resistance of the storage battery pack to the ground on the closing bus and outputting a first detection result;
a current detector for detecting a current flowing through the ground point;
a voltage detector for detecting the voltage to ground of the switching-on bus;
the branch circuit is connected to the storage battery pack through the closing bus and comprises two balance bridge resistors, two detection bridge resistors, a first switch and a second switch, wherein one ends of the two balance bridge resistors are respectively connected to the positive end and the negative end of the closing bus, and the other ends of the two balance bridge resistors are grounded; one end of each of the two detection bridge resistors is connected with the positive end and the negative end of the switching-on bus respectively, and the other end of each of the two detection bridge resistors is grounded through the first switch and the second switch respectively;
the switch controller selectively controls the opening and closing conditions of the first switch and the second switch according to the first detection result; and
and the calculation controller is used for calculating the grounding voltage Ux of the grounding point by the closing bus according to the measurement parameters measured by the current detector and the voltage detector.
Preferably, the switch controller controls the branch circuit to be in a first circuit state and a second circuit state respectively, the first circuit state is that the first switch is closed and the second switch is open, and the second circuit state is that the first switch is open and the second switch is closed; the measurement parameters include a first voltage U1 and a first current I1 measured in the first circuit state, and a second voltage U2 and a second current I2 measured in the second circuit state, and the ground voltage Ux is calculated by formula (1):
preferably, the calculation controller further calculates the ground resistance Rx of the ground point to ground according to formula (2):
preferably, the first voltage U1 and the second voltage U2 are both voltage values of the positive end of the closing bus to the ground; or both the first voltage U1 and the second voltage U2 are voltage values of the negative terminal of the closing bus to the ground.
The method for detecting the grounding point of the storage battery pack is characterized by comprising the following steps of:
s1: polling is carried out on the closing bus, and if the grounding resistance of the storage battery pack to the ground is detected to be abnormal, the step S2 is executed;
s2: closing the first switch, opening the second switch, and measuring a first voltage U1 of the switching-on bus to the ground and a first current I1 flowing on the ground point at the moment;
s3: opening the first switch, closing the second switch, and measuring a second voltage U2 of the switching-on bus to the ground and a second current I2 flowing on the ground point at the moment;
s4: the ground voltage Ux is calculated by formula (1):
preferably, the method further comprises the step S5: the ground resistance Rx is calculated by equation (2):
preferably, the first voltage U1 and the second voltage U2 are both voltage values of the positive end of the closing bus to the ground; or both the first voltage U1 and the second voltage U2 are voltage values of the negative terminal of the closing bus to the ground.
Preferably, when the first voltage U1 and the second voltage U2 are both measured by being connected to the positive terminal of the closing bus, the method further includes the steps of: measuring a voltage value from the positive electrode of the storage battery pack until the current voltage value is measured to be the grounding voltage Ux, and determining that the current position is the grounding point; or when the first voltage U1 and the second voltage U2 are measured by being connected with the negative terminal of the closing bus, the method further comprises the following steps: and starting to measure the voltage value from the negative electrode of the storage battery pack until the current voltage value is measured to be the grounding voltage Ux, and determining the current position to be the grounding point.
Preferably, the cell voltage value Uo in the battery pack is also calculated by formula (3):
the battery pack comprises a storage battery pack, a switching-on bus, a switching-off bus and a storage battery, wherein Ua is a positive terminal voltage value of the switching-on bus, ub is a negative terminal voltage value of the switching-on bus, and K is the number of storage batteries in the storage battery pack;
and then, determining the position of the grounding point according to the proportional relation between Ux and Uo.
Also provided is a DC power supply system comprising
A battery pack;
a control bus and a control feed-out branch;
a closing bus and a closing feed-out branch; and
and the detection device is used for polling the grounding resistance abnormity of the grounding point of the storage battery pack to the ground in the process of polling the closing bus so as to detect the grounding point of the storage battery pack.
The beneficial effects of the implementation of the invention are as follows: the detection device and method for the grounding point of the storage battery pack and the direct-current power supply system can calculate the grounding voltage Ux of the butt joint point of the closing bus according to the measurement parameters measured by the current detector and the voltage detector, thereby determining the position of the grounding point of the storage battery pack and facilitating fault positioning.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a device for detecting battery pack grounding in some embodiments of the present invention;
FIG. 2 is a block diagram of a DC power system in accordance with some embodiments of the invention;
FIG. 3 is a circuit schematic of the subcircuit of FIG. 1;
FIG. 4 is a circuit schematic of the subcircuit of FIG. 3 in a first circuit state;
FIG. 5 is a circuit schematic of the subcircuit of FIG. 3 in a second circuit state;
fig. 6 is a flow chart illustrating a battery grounding detection method according to some embodiments of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Fig. 1 shows a battery grounding point detection apparatus 100 according to some embodiments of the present invention, which is used for detecting grounding point of a battery 600 and applied to a dc power system. Referring to fig. 2, the dc power supply system includes a control bus KM and a control feed-out branch 200, a switching-on bus HM and a switching-on feed-out branch 400, and a storage battery pack 600, wherein the control feed-out branch 200 is connected to the control bus KM to obtain a power supply, the switching-on feed-out branch 400 is connected to the switching-on bus HM to obtain a power supply, and the storage battery pack 600 is connected to positive and negative ends of the switching-on bus HM to perform charging. The battery pack 600 is in a floating state in a normal operation state, that is, the battery pack 600 is in a floating state in which the battery pack operates for 99.9% of the time, i.e., the low current supplement is performed. In the dc power supply system, the battery pack 600 corresponds to a load, that is, to a feeding branch on the closing bus HM. The discharge state of the storage battery pack 600 is only when maintenance and repair and system power loss occur, and the standby power supply of the storage battery pack 600 is started, so that the detection of the insulation grounding of the storage battery pack 600 is not needed. The detection device 100 includes a host 80, a patrol instrument 10, a current detector 60, a voltage detector 40, a bypass circuit 30, a switch controller 20, and a calculation controller 50. The patrol detector 10, the voltage detector 40, the branch circuit 30, the switch controller 20 and the calculation controller 50 are disposed in the host 80, and the current detector 60 may be disposed in the host 80 or outside the host 80. The current detector 60 is connected to the branch circuit 30 and the calculation controller 50, respectively.
The inspection device 10 is configured to inspect the control feed-out branch 200, the closing feed-out branch 400, and the storage battery pack 600 on the closing bus HM, and output a first detection result representing an abnormal condition of the storage battery pack 600 when an abnormal ground resistance of the ground point of the storage battery pack 600 to the ground is detected. Alternatively, the polling on the closing bus HM by the polling device 10 may be a timed polling or a real-time polling. If the grounding resistance of the grounding point of the storage battery pack 600 to the ground is detected to be normal, the subsequent inspection is continuously executed.
As shown in fig. 3, branch circuit 30 is connected to battery pack 600 through closing bus HM. The branch circuit 30 includes two balance bridge resistors Rb1, two detection bridge resistors Rp1, a first switch K1, a second switch K2, and a DC power supply DC. One ends of the two balance bridge resistors Rb1 are connected to the positive end and the negative end of the closing bus HM respectively, and the other ends of the two balance bridge resistors are grounded. One end of each of the two detection bridge resistors Rp1 is connected to the positive end and the negative end of the switching-on bus HM, and the other end of each of the two detection bridge resistors Rp1 is grounded through the first switch K1 and the second switch K2. Two ends of the direct current power supply DC are respectively connected with the positive end and the negative end of the closing bus HM. According to the standard of the national energy agency, in a 220VDC system, the value range of two balance bridge resistors Rb1 is 30K-60K. The two sense bridge resistances Rp1 are used here for current-voltage sensing, i.e. unbalanced bridge resistances. U + represents that a closing bus HM is opposite to a ground voltage value; u-represents the negative voltage to ground value of a closing bus HM; ux represents the voltage of the internal ground point of the storage battery pack 600 to the positive terminal of a closing bus HM, and is an unknown number; rx represents the internal insulation grounding resistance of the storage battery and is an unknown number; i denotes the ground leakage current.
The mathematical model that can be established with the earth as the equipotential in fig. 3 is formula (4):
as further shown in fig. 1 and 2, the current detector 60 is used to detect the current flowing through the grounding point. Preferably, the polling device 10 is a plurality of micro current sensors, and each polling device 10 is respectively disposed on the control feeding-out branch 200, the closing feeding-out branch 400, and the battery pack 600, that is, disposed outside the host 80. Alternatively, the inspector 10 can be provided inside the host 80. The voltage detector 40 is configured to detect a voltage to which the closing bus HM is grounded.
The switch controller 20 is connected to the inspector 10 and receives the first detection result from the inspector 10. The switch controller 20 selectively controls the first switch K1 and the second switch K2 to be opened or closed according to the first detection result. When the first detection result includes information that grounding of battery pack 600 is not detected, switch controller 20 does not perform a corresponding operation. When the first detection result includes information indicating that the battery pack 600 is grounded, the switch controller 20 starts a corresponding operation. Specifically, the switch controller 20 controls the branch circuit 30 to be in a first circuit state and a second circuit state respectively, where the first circuit state is that the first switch K1 is closed and the second switch K2 is open, and the second circuit state is that the first switch K1 is open and the second switch K2 is closed.
The calculation controller 50 is connected to the voltage detector 40 and the current detector 60, and receives the measurement parameters from the voltage detector and the current detector. The measured parameters include a first voltage U1 and a first current I1 measured in a first circuit state, and a second voltage U2 and a second current I2 measured in a second circuit state. The first voltage U1 and the second voltage U2 are both voltage values of the positive end of a closing bus HM to the ground; or both the first voltage U1 and the second voltage U2 are voltage values of the negative end of the closing bus HM to the ground. Preferably, in this embodiment, the first voltage U1 and the second voltage U2 are both voltage values of the positive end of the closing bus HM to the ground.
The calculation controller 50 calculates the ground voltage Ux at the butting point of the closing bus HM based on the measurement parameters measured by the current detector 60 and the voltage detector 40.
The ground voltage Ux is calculated by the formula (1):
alternatively, the calculation controller 50 further calculates the ground resistance Rx of the ground point to the ground according to formula (2):
the following explains the derivation principle of the formula (1) and the formula (2):
the equivalent circuit diagram for the first circuit state is shown in fig. 4, and the equivalent circuit diagram for the second circuit state is shown in fig. 5.
As shown in fig. 4, in the first circuit state, the second switch K2 is opened, the first switch K1 is closed, the current detector 60 detects a current I1 flowing to the ground point, and the voltage detector 40 detects a voltage U1 to the ground of the closing bus HM. The following relationship between I1 and U1 can be obtained from equation (4):
as shown in fig. 5, in the second circuit state, the first switch K1 is opened, the second switch K2 is closed, the current detector 60 detects a current I2 flowing to the ground point, and the voltage detector 40 detects a voltage U2 to which the closing bus HM is grounded. The following relationship between I2 and U2 can be obtained from equation (4):
from equations (5) and (6), the following can be calculated:
the grounding voltage Ux is calculated, and the corresponding grounding point in the battery pack 600 can be found according to the voltage condition. Alternatively, the grounding point on the battery pack 600 is located after the grounding voltage Ux is obtained according to the formula (1). The positioning mode comprises the following three modes: 1. when the first voltage U1 and the second voltage U2 are both measured from the positive terminal of the engaged gate bus HM, the positioning method comprises the steps of: the voltage value is measured from the positive electrode of the storage battery pack 600 until the current voltage value is measured to be the grounding voltage Ux, and the current position is determined to be the grounding point. Or when 2, the first voltage U1 and the second voltage U2 are all measured from the negative terminal of the engaged gate bus HM, the positioning method comprises the following steps: the voltage value is measured from the negative electrode of the storage battery pack 600 until the current voltage value is measured to be the grounding voltage Ux, and the current position is determined to be the grounding point. Or, 3, calculating a cell voltage value Uo in the battery pack 600 by the formula (3):
wherein Ua is a positive terminal voltage value of a closing bus HM, ub is a negative terminal voltage value of the closing bus HM, and K is the number of storage batteries in the storage battery pack 600; and then, determining the position of the grounding point according to the proportional relation between Ux and UO.
It should be noted that the above three embodiments can be implemented by manual operation, or by a hardware device, or by a software control, and are not limited herein.
Fig. 6 shows a method for detecting grounding of a battery pack according to some embodiments of the present invention, and the detection of grounding of the battery pack 600 by the detection apparatus 100 according to the above embodiments includes the following steps S1 to S5.
As shown in fig. 1 and 2, in step S1, first, inspection is performed on closing bus HM, and if it is detected that ground resistance of battery pack 600 to ground is abnormal, step S2 is executed. Preferably, in this step, the polling on the closing bus HM may be a timed polling or a real-time polling. If the grounding resistance of the grounding point of the storage battery pack 600 to the ground is detected to be normal, the follow-up inspection is continuously executed.
In step S2, the first switch K1 is closed, the second switch K2 is opened, and the first voltage U1 of the closing bus HM to the ground and the first current I1 flowing through the ground point at this time are measured. In step S3, the first switch K1 is opened, the second switch K2 is closed, and the second voltage U2 of the closing bus HM to the ground and the second current I2 flowing through the ground point at this time are measured. Thereby the parameters U1, I1, U2, I2 for performing step S4 are obtained by step S2 and step S3. The first voltage U1 and the second voltage U2 are both voltage values of the positive end of a closing bus HM to the ground; or both the first voltage U1 and the second voltage U2 are voltage values of the negative end of the closing bus HM to the ground. Preferably, in this embodiment, the first voltage U1 and the second voltage U2 are both voltage values of the positive end of the closing bus HM to the ground.
In step S4, the ground voltage Ux is calculated by the formula (1):
in step S5: the ground resistance Rx is calculated by equation (2):
regarding the derivation of the formula (1) and the formula (2), the derivation algorithm in the grounding point detection apparatus 100 of the battery pack 600 according to the above-described embodiment of the present invention can be referred to.
After the grounding voltage Ux is obtained according to the formula (1), the grounding point on the battery pack 600 is positioned. The positioning mode comprises the following three modes: 1. when the first voltage U1 and the second voltage U2 are both measured from the positive terminal of the engaged gate bus HM, the positioning method comprises the steps of: the voltage value is measured from the positive electrode of the storage battery pack 600 until the current voltage value is measured to be the grounding voltage Ux, and the current position is determined to be the grounding point. Or when 2, the first voltage U1 and the second voltage U2 are all measured from the negative terminal of the engaged gate bus HM, the positioning method comprises the following steps: the voltage value is measured from the negative electrode of the storage battery pack 600 until the current voltage value is measured to be the grounding voltage Ux, and the current position is determined to be the grounding point. Or, 3, calculating a cell voltage value Uo in the battery pack 600 by the formula (3):
wherein Ua is a positive terminal voltage value of a closing bus HM, ub is a negative terminal voltage value of the closing bus HM, and K is the number of storage batteries in the storage battery pack 600; and then, determining the position of the grounding point according to the proportional relation between Ux and Uo.
It should be noted that the above three embodiments can be implemented by manual operation, or by a hardware device, or by a software control, and are not limited herein.
Fig. 2 shows a dc power supply system in some embodiments of the present invention, which includes a control bus KM and a control feed-out branch 200, a switching-on bus HM and a switching-on feed-out branch 400, a storage battery pack 600, and the detection apparatus 100 in the above embodiments, wherein the control feed-out branch 200 is connected to the control bus KM to obtain a power supply, the switching-on feed-out branch 400 is connected to the switching-on bus HM to obtain a power supply, the storage battery pack 600 is connected to positive and negative ends of the switching-on bus HM to perform charging, and the detection apparatus 100 is respectively connected to the switching-on bus HM, the control bus KM, the control feed-out branch 200, the switching-on feed-out branch 400, and the storage battery pack 600. The detection device 100 is used for detecting that the grounding resistance of the grounding point of the storage battery pack 600 is abnormal to the ground in the process of routing inspection of the closing bus HM, so that the grounding point of the storage battery pack 600 is detected. Preferably, the closing bus HM shares a negative terminal with the control bus KM.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered within the scope of the present invention.
Claims (8)
1. A detection method for a grounding point of a storage battery pack comprises a detection device, wherein the detection device is applied to a direct current power supply system, the direct current power supply system comprises a closing bus (HM) and the storage battery pack (600) which is connected to the closing bus (HM) for charging, and the detection device is characterized by comprising a detection device
The inspection device (10) is used for inspecting the abnormal grounding resistance of the grounding point of the storage battery pack (600) to the ground on the closing bus (HM) and outputting a first detection result;
a current detector (60) for detecting a current flowing through the grounding point;
a voltage detector (40) that detects a voltage to ground of the closing bus (HM);
the branch circuit (30) is connected to the storage battery pack (600) through the closing bus (HM), the branch circuit (30) comprises two balance bridge resistors (Rb 1), two detection bridge resistors (Rp 1), a first switch (K1) and a second switch (K2), one ends of the two balance bridge resistors (Rb 1) are respectively connected to the positive end and the negative end of the closing bus (HM), and the other ends of the two balance bridge resistors are grounded; one end of each of the two detection bridge resistors (Rp 1) is connected with the positive end and the negative end of the switching-on bus (HM), and the other end of each of the two detection bridge resistors is grounded through the first switch (K1) and the second switch (K2);
a switch controller (20) for selectively controlling the first switch (K1) and the second switch (K2) to be opened or closed according to the first detection result; and
a calculation controller (50) for calculating a grounding voltage Ux of the closing bus (HM) to the grounding point according to the measurement parameters measured by the current detector (60) and the voltage detector (40);
the detection method is used for detecting the grounding point of the storage battery pack through the detection device, and comprises the following steps:
s1: routing inspection is carried out on the closing bus (HM), and if the ground resistance of the ground point of the storage battery pack (600) to the ground is detected to be abnormal, the step S2 is executed;
s2: closing the first switch (K1), opening the second switch (K2), and measuring a first voltage U1 of the closing bus (HM) to the ground and a first current I1 flowing on the grounding point at the moment;
s3: opening the first switch (K1), closing the second switch (K2), and measuring a second voltage U2 of the closing bus (HM) to the ground and a second current I2 flowing on the grounding point at the moment;
s4: the ground voltage Ux is calculated by formula (1):
2. the detection method according to claim 1, wherein the switch controller (20) controls the branch circuit (30) to be in a first circuit state and a second circuit state respectively, the first circuit state being that the first switch (K1) is closed and the second switch (K2) is open, and the second circuit state being that the first switch (K1) is open and the second switch (K2) is closed; the measurement parameters include a first voltage U1 and a first current I1 measured in the first circuit state, and a second voltage U2 and a second current I2 measured in the second circuit state, and the ground voltage Ux is calculated by formula (1):
3. the detection method according to claim 2, wherein the calculation controller (50) further calculates the ground resistance Rx of the ground point to ground according to formula (2):
4. the detection method according to claim 2 or 3, wherein the first voltage U1 and the second voltage U2 are both voltage values of a positive terminal of the closing busbar (HM) to ground; or, the first voltage U1 and the second voltage U2 are both voltage values of the negative end of the closing bus (HM) to the ground.
5. The detection method according to claim 1, further comprising step S5: the ground resistance Rx is calculated by equation (2):
6. the detection method according to claim 1, wherein the first voltage U1 and the second voltage U2 are both voltage values of a positive terminal of the closing bus (HM) to ground; or, the first voltage U1 and the second voltage U2 are both voltage values of the negative end of the closing bus (HM) to the ground.
7. The method according to claim 6, wherein when the first voltage U1 and the second voltage U2 are both measured from the positive terminal of the switching-on bus (HM), the method further comprises the steps of: measuring a voltage value from the anode of the storage battery pack (600), and determining the current position as the grounding point until the current voltage value is measured to be the grounding voltage Ux; or, when the first voltage U1 and the second voltage U2 are both measured by being connected to the negative terminal of the closing bus (HM), the method further includes the steps of: and starting to measure the voltage value from the negative electrode of the storage battery pack (600), and determining the current position as the grounding point when the current voltage value is measured to be the grounding voltage Ux.
8. The detection method according to claim 6, characterized in that a cell voltage value Uo in the battery pack (600) is also calculated by formula (3):
the battery pack comprises a storage battery pack (600), a switching-on bus (HM), a switching-off bus (Ua), a switching-on bus (HM), a switching-off bus (Ub), a switching-on bus (HM), a switching-off bus (HM), a switching-on bus (HM), a switching-off bus (Ub), and a storage battery number, wherein Ua is a positive terminal voltage value of the switching-on bus (HM), ub is a negative terminal voltage value of the switching-on bus (HM), and K is the number of storage batteries in the storage battery pack (600);
and then, determining the position of the grounding point according to the proportional relation between Ux and Uo.
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| 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 |
| CN111817284B (en) * | 2020-09-04 | 2021-01-19 | 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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| CN1721863A (en) * | 2004-07-14 | 2006-01-18 | 许继集团有限公司 | Apparatus and method for measuring direct current branch insulation resistance utilizing unbalanced bridge |
| CN103149406A (en) * | 2013-01-31 | 2013-06-12 | 北京人民电器厂有限公司 | Bridge used for direct current insulation monitoring device and running method thereof |
| JP2014025760A (en) * | 2012-07-25 | 2014-02-06 | Chugoku Electric Power Co Inc:The | Insulation diagnostic device, insulation diagnostic system, and program |
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2015
- 2015-01-05 CN CN201510006007.9A patent/CN105823954B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1721863A (en) * | 2004-07-14 | 2006-01-18 | 许继集团有限公司 | Apparatus and method for measuring direct current branch insulation resistance utilizing unbalanced bridge |
| JP2014025760A (en) * | 2012-07-25 | 2014-02-06 | Chugoku Electric Power Co Inc:The | Insulation diagnostic device, insulation diagnostic system, and program |
| CN103149406A (en) * | 2013-01-31 | 2013-06-12 | 北京人民电器厂有限公司 | Bridge used for direct current insulation monitoring device and running method thereof |
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| CN105823954A (en) | 2016-08-03 |
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