CN113687233A - Method for monitoring and alarming separation of storage battery pack from direct current bus and poor contact - Google Patents
Method for monitoring and alarming separation of storage battery pack from direct current bus and poor contact Download PDFInfo
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- CN113687233A CN113687233A CN202110991712.4A CN202110991712A CN113687233A CN 113687233 A CN113687233 A CN 113687233A CN 202110991712 A CN202110991712 A CN 202110991712A CN 113687233 A CN113687233 A CN 113687233A
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- battery pack
- direct current
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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]
- G01R31/3644—Constructional arrangements
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
-
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
Abstract
The invention discloses a method for monitoring and alarming the separation of a storage battery from a direct current bus and poor contact, wherein digital temperature sensors are embedded in a positive terminal of the direct current bus, a negative terminal of the direct current bus, a positive terminal of a battery pack and a negative terminal of the battery pack; a circulating current is formed between the positive pole of the direct current bus connected with the positive pole of the battery pack and between the negative pole of the direct current bus and the negative pole of the battery pack through a constant current source, a current-limiting resistor, a fuse and a disconnecting switch respectively; then, whether the connector of the terminal is in poor contact or not is monitored through temperature; monitoring whether the positive electrode and the negative electrode of the battery pack are separated from the direct current bus or not through current; whether fuse, knife switch contact failure and whether the group battery breaks away from the direct current generating line are monitored through voltage. The monitoring and alarming method can detect the separation of the battery pack from the direct current bus in real time, can distinguish whether the positive pole of the storage battery pack is separated from the bus or the negative pole of the storage battery pack is separated from the bus, and can judge whether the virtual connection phenomenon exists at the contact point.
Description
Technical Field
The invention belongs to the technical field of storage batteries, and relates to a method for monitoring and alarming separation of a storage battery pack from a direct current bus or poor contact.
Background
A fuse, a disconnecting link and a connecting cable are arranged between the storage battery pack and the direct current bus, the storage battery pack is separated from the bus due to loosening or disconnection of a connecting cable joint and disconnection of the fuse and the disconnecting link, and the accident of the multi-stage transformer substation is related to the separation of the storage battery pack from the bus and is difficult to accurately detect based on the current operation and maintenance detection technology.
The patent application 'method and device for detecting fusing and open circuit of main fuse of storage battery (application number 201710496457. X)' and the patent application 'device and method for monitoring and warning that storage battery is separated from direct current bus' (application number 201611085512.8) relate to the problem that storage battery is separated from direct current bus, but floating charging current is introduced into the judgment strategy as criterion. A large amount of experimental data show that even though the existing float current sensor has extremely high precision, the existing float current sensor is limited by the difference of the capacity, the performance and the load equipment configuration of the storage battery of the direct current system of the transformer substation, the float current has extremely large difference, and the misjudgment rate of the judgment result is high.
Disclosure of Invention
The invention aims to provide a method for monitoring and alarming the separation of a storage battery from a direct current bus and poor contact, which reduces the misjudgment rate and improves the judgment precision.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a monitoring and alarming method for separation of a storage battery pack from a direct current bus and poor contact comprises the following steps:
digital temperature sensors are embedded in the direct current bus positive terminal A, the direct current bus negative terminal D, the battery pack positive terminal B and the battery pack negative terminal C;
the positive electrode of a constant current source E1 is connected to a positive electrode terminal A of a direct current bus through a current-limiting resistor R1, then sequentially passes through a fuse F1 and a disconnecting link switch K1 to a positive electrode terminal B of a battery pack, and the terminal B is connected to the negative electrode of the constant current source E1 to form a circulating current I1;
the positive electrode of a constant current source E2 is connected to a negative terminal C of a battery pack through a current-limiting resistor R2, then sequentially passes through a fuse F2 and a disconnecting switch K2 to a negative terminal D of a direct current bus, and the terminal D is connected to the negative electrode of the constant current source E2 to form a circulating current I2;
by temperature monitoring:
if the temperature value displayed by any one of the four digital temperature sensors is 5 ℃ higher than the indoor environment temperature of the battery pack, the terminal joint where the digital temperature sensor is located is in poor contact;
monitoring through current:
if I1=0, the fuse F1 or the disconnecting switch K1 is disconnected, and the positive pole of the battery pack is separated from the positive pole of the direct current bus;
if I2=0, the fuse F2 or the disconnecting switch K2 is disconnected, and the negative electrode of the battery pack is separated from the negative electrode of the direct-current bus;
monitoring through voltage:
monitoring a voltage V1 between a positive terminal A of the direct current bus and a positive terminal B of the battery pack, and when the voltage V1 is greater than a set threshold value, the fuse F1 or the disconnecting link switch K1 are in poor contact, or the fuse F1 and the disconnecting link switch K1 are in poor contact;
monitoring a voltage V3 between a battery pack negative terminal C and a direct current bus negative terminal D, and when the voltage V3 is greater than a set value, performing poor contact on a fuse F2 or a disconnecting link switch K2, or performing poor contact on both the fuse F2 and a disconnecting link switch K2;
and monitoring the voltage V2 between the positive terminal B of the battery pack and the negative terminal C of the battery pack, and when the difference between the voltage V4 and the voltage V2 is larger than the sum of the set threshold of the voltage V1 and the set value of the voltage V3, disconnecting the battery pack from the direct current bus.
The monitoring and alarming method of the invention connects the positive and negative poles of the battery pack with the DC bus through the fuse and the disconnecting switch, and the method of forming circulation current between the fuse and the disconnecting switch by using the independent constant current source is stable to monitor whether the fuse and the disconnecting switch are disconnected. The terminal voltage and the charging and discharging current of the battery pack change along with the changes of the working states of uniform charging, floating charging, discharging and the like, and are difficult to judge by monitoring the terminal voltage and the current of the battery pack.
The monitoring and alarming method can detect the separation of the battery pack from the direct current bus in real time, can distinguish whether the positive pole of the storage battery pack is separated from the bus or the negative pole of the storage battery pack is separated from the bus, and can judge whether the virtual connection phenomenon exists at the contact point.
Drawings
Fig. 1 is a schematic diagram of the connection between the relevant electrical components and the battery pack used in the monitoring alarm method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Because of the limitation of different capacities, performances and load equipment configurations of storage batteries of the direct current system of the transformer substation, the difference of the floating charging currents is very large, and the misjudgment rate is high when whether the storage battery pack falls off a direct current bus or not is judged through the floating charging currents. In order to solve the problems in the prior art, the invention provides a monitoring and alarming method for the separation of a storage battery pack from a direct current bus, which can reduce the misjudgment rate and improve the judgment precision, and the method specifically comprises the following steps:
1) referring to fig. 1, digital temperature sensors are embedded in a direct current bus positive terminal a, a direct current bus negative terminal D, a battery pack positive terminal B and a battery pack negative terminal C;
the positive electrode of a constant current source E1 is connected to a positive electrode terminal A of a direct current bus through a current-limiting resistor R1, then sequentially passes through a fuse F1 and a disconnecting link switch K1 to a positive electrode terminal B of a battery pack, and the terminal B is connected to the negative electrode of the constant current source E1 to form a circulating current I1;
the positive electrode of a constant current source E2 is connected to a negative terminal C of a battery pack through a current-limiting resistor R2, then sequentially passes through a fuse F2 and a disconnecting switch K2 to a negative terminal D of a direct current bus, and the terminal D is connected to the negative electrode of the constant current source E2 to form a circulating current I2;
2) normally, the resistance value of the fuse F1, the resistance value of the knife switch K1, the resistance value of the fuse F2 and the resistance value of the knife switch K2 are all very small and can be ignored, I1= E1/R1, I2= E2/R2;
for example, both E1 and E2 take 30V, and both R1 and R2 take 120 Ω, then I1= I2=30V/120 Ω =250 mA;
3) by temperature monitoring:
if the temperature value displayed by any one of the four digital temperature sensors is 5 ℃ higher than the indoor environment temperature of the battery pack, the terminal joint where the digital temperature sensor is located is in poor contact;
in the above example, the indoor ambient temperature of the battery pack is T0, the monitored temperature of the positive terminal a of the dc bus is TA, the monitored temperature of the negative terminal D of the dc bus is TD, the monitored temperature of the positive terminal B of the battery pack is TB, the monitored temperature of the negative terminal C of the battery pack is TC, and if any one of TA, TB, TC, and TD is higher than the ambient temperature T0 by 5 ℃, it is determined that the corresponding terminal joint is in poor contact.
Monitoring through current:
if I1=0 is monitored, the fuse F1 or the disconnecting switch K1 is disconnected, and the positive electrode of the battery pack is separated from the positive electrode of the direct current bus;
if I2=0 is monitored, the fuse F2 or the disconnecting switch K2 is disconnected, and the negative electrode of the battery pack is separated from the negative electrode of the direct-current bus;
monitoring through voltage:
monitoring the voltage V1 between the positive terminal A of the direct current bus and the positive terminal B of the battery pack, wherein a fuse F1 and a disconnecting switch K1 are normally in a straight-through mode, and V1= 0; when the voltage V1 is more than 0.5V (the current I1 is 250mA, the contact resistance is more than 2 Ω, the voltage drop is more than 0.5V, and when the contact resistance is more than 2 Ω, the current of the direct current bus passing through the fuse F1 and the disconnecting link switch K1 is more than 100A, the power consumption is more than 200W, the contact point generates heat due to overlarge power consumption, the temperature of the digital temperature sensor embedded on the contact point is higher than the ambient temperature, the contact of the fuse F1 or the disconnecting link switch K1 between the terminal A of the positive end of the direct current bus and the terminal B of the positive end of the battery pack is poor, or the contact of the fuse F1 and the disconnecting link switch K1 is poor;
monitoring the voltage V3 between the negative terminal C of the battery pack and the negative terminal D of the direct current bus, wherein a fuse F2 and a disconnecting switch K2 are in direct connection under the normal condition, and V3= 0; when the voltage V3 is greater than 0.5V (the current I2 is 250mA, the voltage drop of the contact resistance greater than 2 Ω is greater than 0.5V, and when the contact resistance is greater than 2 Ω, the current passing through the direct current bus through the F2 and the K2 is greater than 100A, power consumption greater than 200W is generated, and the contact point generates heat when the power consumption is too large, and the temperature of the digital temperature sensor embedded on the contact point is higher than the ambient temperature, so that the contact of the fuse F2 or the disconnecting switch K2 between the negative terminal C of the battery pack and the negative terminal D of the direct current bus is poor, or the contact of the fuse F2 and the disconnecting switch K2 is poor;
monitoring a voltage V2 between a positive terminal B of the battery pack and a negative terminal C of the battery pack, wherein normally, a fuse F1, a disconnecting switch K1, a fuse F2 and a disconnecting switch K2 are completely communicated, at the moment, V1=0, V3=0, and a voltage V2 of the battery pack is equal to a voltage V4 between a positive terminal A of the direct-current bus and a negative terminal D of the direct-current bus; when the difference between the voltage V4 and the voltage V2 is greater than 1V, the battery pack is detached from the DC bus.
Because the current I1 is 250mA, the contact resistance is greater than 2 Ω, the voltage drop is greater than 0.5V, when the contact resistance is greater than 2 Ω, the current of the direct current bus passing through the fuse F1 and the knife switch K1 is greater than 100A, power consumption greater than 200W is generated, excessive power consumption causes heat generation of a contact point, the temperature of the digital temperature sensor embedded in the contact point is higher than the ambient temperature, the current I2 is 250mA, the contact resistance is greater than 2 Ω, the voltage drop is greater than 0.5V, when the contact resistance is greater than 2 Ω, the current of the direct current bus passing through the fuse F2 and the knife switch K2 is greater than 100A, power consumption greater than 200W causes heat generation of the contact point, the temperature of the digital temperature sensor embedded in the contact point is higher than the ambient temperature, considering that the maximum allowable voltage drop of the fuse F1 and the knife switch K1 is 0.5V, the maximum allowable voltage drop of the fuse F2 and the knife switch K2 is 0.5V, the voltage drop of 1V is allowed at maximum when the two are connected in series, so when the difference between the voltage V4 and the voltage V2 is larger than 1V, the battery pack is separated from the direct current bus.
The devices used in the monitoring alarm method of the invention are all related parameters monitored by the singlechip, and if the monitored parameters are larger than the set conditions, the sound and light alarm is triggered and the alarm information is transmitted to the monitoring platform through the transmission channel.
Claims (4)
1. A monitoring and alarming method for separation of a storage battery from a direct current bus and poor contact is characterized by comprising the following steps:
digital temperature sensors are embedded in the direct current bus positive terminal, the direct current bus negative terminal, the battery pack positive terminal and the battery pack negative terminal;
the positive electrode of a constant current source E1 is connected to the positive electrode terminal of a direct current bus through a current limiting resistor R1, then sequentially passes through a fuse F1 and a disconnecting link switch K1 to the positive electrode terminal of a battery pack, and the positive electrode terminal of the battery pack is connected to the negative electrode of the constant current source E1 to form a circulating current I1;
the positive electrode of a constant current source E2 is connected to the negative terminal of a battery pack through a current-limiting resistor R2, then sequentially passes through a fuse F2 and a disconnecting switch K2 to the negative terminal of a direct current bus, and the negative terminal of the direct current bus is connected to the negative electrode of the constant current source E2 to form a circulating current I2;
by temperature monitoring:
if the temperature value displayed by any one of the four digital temperature sensors is 5 ℃ higher than the indoor environment temperature of the battery pack, the terminal joint where the digital temperature sensor is located is in poor contact;
monitoring through current:
if I1=0, the fuse F1 or the disconnecting switch K1 is disconnected, and the positive pole of the battery pack is separated from the positive pole of the direct current bus;
if I2=0, the fuse F2 or the disconnecting switch K2 is disconnected, and the negative electrode of the battery pack is separated from the negative electrode of the direct-current bus;
monitoring through voltage:
monitoring a voltage V1 between a positive terminal of the direct current bus and a positive terminal of the battery pack, and when the voltage V1 is greater than a set threshold value, the fuse F1 or the disconnecting link switch K1 are in poor contact, or the fuse F1 and the disconnecting link switch K1 are in poor contact;
monitoring a voltage V3 between a negative terminal of the battery pack and a negative terminal of the direct current bus, and when the voltage V3 is greater than a set value, the fuse F2 or the disconnecting link switch K2 are in poor contact, or the fuse F2 and the disconnecting link switch K2 are in poor contact;
and monitoring the voltage V2 between the positive terminal of the battery pack and the negative terminal of the battery pack, and simultaneously monitoring the voltage V4 between the positive terminal of the direct current bus and the negative terminal of the direct current bus, wherein when the difference between the voltage V4 and the voltage V2 is larger than the sum of the set threshold value of the voltage V1 and the set value of the voltage V1, the battery pack is separated from the direct current bus.
2. The method for monitoring and alarming the separation of the storage battery pack from the direct current bus and poor contact as claimed in claim 1, wherein under the normal condition, V1=0 under the normal condition; the set threshold of the voltage V1 is 0.5V.
3. The method for monitoring and alarming the separation of the storage battery pack from the direct current bus and poor contact as claimed in claim 1, wherein under the normal condition, V3=0 under the normal condition; the set value of the voltage V3 was 0.5V.
4. The battery pack disconnection and contact failure monitoring alarm method according to claim 1, wherein when monitoring the voltage V2 between the battery pack positive terminal B and the battery pack negative terminal C, under normal conditions, V1=0, V3=0, and the battery pack voltage V2 is equal to the voltage V4 between the dc bus positive terminal and the dc bus negative terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110991712.4A CN113687233A (en) | 2021-08-27 | 2021-08-27 | Method for monitoring and alarming separation of storage battery pack from direct current bus and poor contact |
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| CN202110991712.4A CN113687233A (en) | 2021-08-27 | 2021-08-27 | Method for monitoring and alarming separation of storage battery pack from direct current bus and poor contact |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115494404A (en) * | 2022-07-19 | 2022-12-20 | 广州杉和信息科技有限公司 | Storage battery pack online monitoring method |
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