CN106571688B - DC system operation mode and method for monitoring operation state of isolating switch - Google Patents
DC system operation mode and method for monitoring operation state of isolating switch Download PDFInfo
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- CN106571688B CN106571688B CN201610994450.6A CN201610994450A CN106571688B CN 106571688 B CN106571688 B CN 106571688B CN 201610994450 A CN201610994450 A CN 201610994450A CN 106571688 B CN106571688 B CN 106571688B
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- 238000000034 method Methods 0.000 title claims abstract description 122
- 238000012544 monitoring process Methods 0.000 title claims abstract description 39
- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 238000012806 monitoring device Methods 0.000 claims description 114
- 238000002955 isolation Methods 0.000 claims description 72
- 238000004891 communication Methods 0.000 claims description 24
- 238000012423 maintenance Methods 0.000 claims description 17
- 238000007667 floating Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 7
- 230000005856 abnormality Effects 0.000 description 3
- 238000012502 risk assessment Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 101000701286 Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1) Alkanesulfonate monooxygenase Proteins 0.000 description 2
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- H02J13/0006—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention discloses a method for monitoring the running mode and the running state of a disconnecting switch of a direct current system, which is characterized in that a bus tie disconnecting switch 5ZK, a first charging machine direct current bus side disconnecting switch 1ZK, a second charging machine direct current bus side disconnecting switch 2ZK, a first storage battery disconnecting switch 3ZK and a second storage battery disconnecting switch 4ZK in the direct current system are used for determining that the switching operation is correct and in place according to a voltage difference, current and position signals of the bus tie disconnecting switch, an auxiliary switch position contact judgment method, a disconnecting switch loop current judgment method, a disconnecting switch two-side differential pressure judgment method or a combined analysis judgment method, and switching logic accords with a related operation flow, and potential fault hidden danger can be found. The technical problems that the isolating switch state of the current direct current system cannot be effectively monitored, the running mode of the direct current system cannot be effectively identified, and the abnormal running state cannot give an alarm, so that the serious potential safety hazard and the low safety reliability are solved.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a running mode of a direct current system and a method for monitoring the state of an isolating switch of the running mode.
Background
The direct current power supply system adopted by the power plant, the transformer substation and the communication machine room of the current power system mainly comprises a monitoring device, a charger (comprising a microcomputer control device of the charger), a storage battery, a direct current bus, a feeder unit of the direct current bus and the like, and provides reliable working power supply for relay protection, a control loop, monitoring equipment, communication equipment and the like in the power system, and plays an important role in safe and stable operation of power infrastructure. According to the relevant regulations of the power system on the direct current power supply system, in order to verify the capacity of the storage battery pack, 1 check discharge test should be carried out on the storage battery pack which is put into operation for less than 6 years in 2 years, and 1 check discharge test should be carried out on the storage battery pack which is put into operation for more than 6 years in 1 year so as to determine whether the storage battery meets the requirement of continuous operation. Before the check discharge test of the storage battery, the complicated operation needs to be performed, the storage battery is completely separated from the load, and meanwhile, the load must not lose voltage in the operation process, so that the related isolating switch needs to be switched on and off according to a correct operation flow, and the original state must be recovered after the check capacity is finished.
As can be seen from fig. 1, during normal operation, the direct current # 1 charger is put on the direct current section I bus through the 1ZK isolating switch to operate, i.e. 1ZK is put above 3ZK, and 3ZK is located at the closing position, i.e. the #1 storage battery is connected to the direct current section I bus through 3ZK to operate; during normal operation, the direct current #2 charger is put on the direct current II section bus through the 2ZK isolating switch to operate, namely 2ZK is put above 4ZK, and 4ZK is located at the position of the direct current II section bus, namely the #2 storage battery pack is connected into the direct current II section bus through 4ZK to operate; during normal operation, the direct current I section bus and the direct current II section bus independently operate, and the 5ZK is located at the breaking position, and if two sections of buses are required to operate in parallel, the 5ZK is located at the combining position.
As can be seen from fig. 2, during normal operation, the 1ZK and 2ZK isolating switches are put into the dc bus position, the 3ZK and 4ZK isolating switches are put into operation, and at this time, the 3ZK and 4ZK isolating switches and the 1ZK and 2ZK isolating switches must be put into the dc bus position. If the 3ZK and 4ZK isolating switches are not at the input positions, the storage battery is separated from the direct current bus, and if the power system has accidents and needs protection action at the moment, the storage battery is not connected to the direct current bus, so that protection refusal and override tripping accidents occur. If the 1ZK and 2ZK isolating switches are not closed in place at the positions of the direct current buses, the storage battery is output as a power supply, and the storage battery is over-discharged, so that the service life of the storage battery is influenced, and protection refusing and override tripping accidents can occur due to over-low voltage or insufficient capacity. Therefore, the positions of the 1ZK, 2ZK, 3ZK and 4ZK isolating switches must be effectively monitored, and the running state of the direct current system is confirmed to meet the running requirement, otherwise, an alarm signal is sent out.
The isolating switch is equipment in a long-term running state, and an operating handle or the isolating switch is in a single working state for a long time, so that partial performance of the isolating switch is easy to be reduced, and the isolating switch is opened and closed in place, so that the next operation cannot meet the expectations, namely the condition that the isolating switch is closed or opened in place is not realized; due to operator negligence, the foregoing phenomenon of out-of-place is not found in time, which may cause the phenomenon of violating the operation procedure to occur, so that accident potential exists, such as: the 3ZK and 4ZK isolating switches are separated by mistake, so that the storage battery is separated from the direct current bus; due to carelessness of the acceptance person, the disconnecting switch may not be found to be operated to a correct position, and an accident potential may be caused. The above situations can cause overdischarge of the storage battery or voltage loss of the direct current bus, so that other protection devices in the station can not work normally, even protection refusal and override trip accidents occur, and serious safety accidents are caused. Therefore, the positions of the 1ZK, 2ZK, 3ZK and 4ZK isolating switches must be effectively monitored, and the running state of the direct current system is confirmed to meet the running requirement, otherwise, an alarm signal is sent out.
On the basis of a normal operation mode, the #1 charger and the #1 storage battery are required to be separated from a direct current system for maintenance or debugging (as shown in fig. 3), then the 5ZK isolating switch is required to be put into a closed state, then the 1ZK isolating switch is switched to a position separated from a direct current bus, and then the 3ZK isolating switch is switched to an open state. At this time, the 3ZK is strictly forbidden to be put into the open state when the 5ZK is in the open state or before the 5ZK is in the open state, i.e. the 3ZK must be closed well when the 5ZK is in the open state, otherwise, protection refusal and override trip accidents may occur. Therefore, the positions of the 1ZK, 2ZK, 3ZK, 4ZK and 5ZK isolating switches must be effectively monitored, and the running state of the direct current system is confirmed to meet the running requirement, otherwise, an alarm signal is sent out.
Transformer burnout occurs in 330 kv suburban substations and 110 kv Wei Qu substations (co-located construction) of power company of shanxi province of the national network at 6 months and 18 days, and causes power failure in suburban areas.
According to accident investigation reports published by the national energy agency, the accidents directly cause the burning loss of 1 transformer with 330 kilovolts and 2 transformers with 110 kilovolts, and the damage and rejection of partial 110 kilovolts and 35 kilovolts of electrical equipment, thereby directly realizing economic loss of 378.2 ten thousand yuan of people's coins. The accident causes the suburb of 330 kilovolts to become full stop, and the 110 kilovolt transformer substation of 8 seats on the periphery loses voltage. The total loss load is 24.3 kilowatts, which accounts for 7.34% of the total load in the western security area and 1.48% of the total load of the Shaanxi power grid; the power failure users are 8.65 thousands of users, which account for 4.32% of the total users in the western security area.
The main reasons are as follows: the middle head of the 35 KV Wei Li cable explodes, so that an alternating current power supply used in a station is interrupted, a direct current power supply is lost due to the failure of a storage battery, a protection and control loop cannot act, a fault is over-level, and a 330 KV and 110 KV transformer continuously bears short-circuit current, and the short-circuit current exceeds the thermal stability limit of the transformer, so that the transformer is ignited and burnt. Because of work omission, the disconnecting link switch connected in series between two groups of new storage batteries and two sections of direct current buses is broken illegally, the storage batteries are not conducted with the direct current buses, the specification of reversed load operation is not met, and the hidden trouble is not found for a long time, so that the accident is enlarged.
At present, no effective measures can judge whether the isolating switch is opened or closed well, and the isolating switch mainly depends on manual identification of operators to finish various operations and judgment, so that the technical problems of serious potential safety hazard and low safety reliability exist.
Disclosure of Invention
The embodiment of the invention provides a direct current system operation mode and a method for monitoring the state of an isolating switch, which solve the technical problems that the state of the isolating switch in the current direct current system cannot be effectively monitored, the direct current system operation mode cannot be effectively identified, and the abnormal operation state cannot give an alarm, so that the serious potential safety hazard and the safety reliability are low.
The embodiment of the invention provides a direct current system operation mode and a method for monitoring the state of an isolating switch, which comprises the following steps:
a method for monitoring the operation mode and the state of an isolating switch of a direct current system, which is characterized by comprising the following steps:
s1: the running state monitoring device of the direct current system is characterized by calculating the voltage difference of voltages at two sides of a bus tie isolation switch 5ZK, a first charger direct current bus side isolation switch 1ZK, a second charger direct current bus side isolation switch 2ZK, a first storage battery isolation switch 3ZK and a second storage battery isolation switch 4ZK, and measuring the position signals of the bus tie isolation switch 5ZK, the first charger direct current bus side isolation switch 1ZK, the second charger direct current bus side isolation switch 2ZK, the first storage battery isolation switch 3ZK, the current passed by the second storage battery isolation switch 4ZK and the auxiliary contact of the identification isolation switch;
s2: the running state monitoring device of the direct current system determines that the bus tie isolating switch 5ZK, the first charging machine direct current bus side isolating switch 1ZK, the second charging machine direct current bus side isolating switch 2ZK, the first storage battery isolating switch 3ZK and the second storage battery isolating switch 4ZK are correctly opened and closed according to the voltage difference, the current and the position signal combined with a preset switch position auxiliary contact judging method or a preset isolating switch loop current judging method or a preset isolating switch two-side voltage difference judging method or a preset combination analysis judging method.
Optionally, step S1 is preceded by:
determining the normal operation of a direct current system;
the first section bus and the second section bus adopt a split operation state when the direct current system normally operates, at this time, the bus contact isolating switch 5ZK is in an open state, the first charger is used for throwing the direct current bus side isolating switch 1ZK, the second charger is used for throwing the direct current bus side isolating switch 2ZK, the first storage battery isolating switch 3ZK and the second storage battery isolating switch 4ZK are all in a closed state, and the direct current system is in a floating charging mode in the normal operation state.
Optionally, when the direct current system meets a charging condition, the first charger and the second charger enter a charging mode, and the first charger and the second charger charge the first storage battery and the second storage battery respectively.
Optionally, when the direct current system meets the homogeneous charge condition, the direct current system monitoring device starts homogeneous charge at fixed time, and the direct current system monitoring device is controlled to start homogeneous charge manually, and the direct current system running state monitoring device sends a starting homogeneous charge command to the direct current system monitoring device to start homogeneous charge;
The starting and charging means that the direct current system monitoring device sends a starting and charging command to the microcomputer control device of the charger to start and charging through the communication interface.
Optionally, the method also comprises presetting a running mode of the direct current system;
the operation mode of the preset direct current system comprises the following steps:
when the first storage battery connected with the section of bus needs the storage battery nuclear capacity, the first charger loop breaks down and needs equipment maintenance, the first storage battery pack or the first charger loop needs to be separated from the system to work, the bus connecting isolating switch 5ZK is firstly closed to realize the parallel operation state of the section of bus and the two sections of bus, after the bus connecting isolating switch 5ZK is confirmed to be completely closed, the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are opened, at the moment, the second charger direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK are positioned in the closed state, and the equipment maintenance or the storage battery nuclear capacity work can be carried out after the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are confirmed to be completely opened;
when the maintenance or the recovery process after the storage battery nuclear capacity work is completed is to firstly switch on the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK, and after the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are confirmed to be completely closed, the bus contact isolating switch 5ZK is disconnected, and after the bus contact isolating switch 5ZK is confirmed to be completely disconnected, the direct current system is recovered to a normal running state;
When the second storage battery connected with the two-section bus needs a storage battery nuclear capacity, a second charger loop breaks down and needs equipment maintenance, and the second storage battery pack or the second charger loop needs to be separated from the system to work, the bus connecting isolating switch 5ZK is firstly closed to realize a direct current bus parallel operation state, after the bus connecting isolating switch 5ZK is confirmed to be completely closed, the second charger direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK are disconnected, at the moment, the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK isolating switch are positioned in a closed state, and equipment maintenance or storage battery nuclear capacity work can be carried out after the second charger direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK are confirmed to be completely opened;
when the equipment overhaul or the recovery process after the storage battery nuclear capacity work is completed, the second charger is firstly closed to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK, and after the second charger is confirmed to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK to be closed completely, the bus contact isolating switch 5ZK is disconnected, and after the bus contact isolating switch 5ZK is confirmed to be completely disconnected, the direct current system is recovered to a normal running state.
Optionally, when the preset direct current system operation mode and operation process are violated or the closing and opening states of the isolating switch do not meet the specified positions in the preset direct current system operation mode, an alarm signal is sent.
The direct current system provided by the embodiment of the invention comprises:
a first section bus and a second section bus;
the first section of bus is connected with the first charger through a first charger loop, and the first section of bus is connected with the first storage battery through a first storage battery loop;
the second-section bus is connected with a second charger through a second charger loop, and is connected with a second storage battery through a second storage battery loop;
the first section of bus and the second section of bus are connected through a bus tie isolating switch 5 ZK;
the first charger loop is provided with a first charger direct current bus side isolating switch 1ZK;
the first storage battery loop is provided with a first storage battery isolating switch 3ZK;
the second charger loop is provided with a second charger direct current bus side isolating switch 2ZK;
the second battery circuit is provided with a second battery isolating switch 4ZK.
Optionally, the direct current system is provided with a direct current system monitoring device 1;
The DC system is provided with a DC system running state monitoring device 1;
the first charger is provided with a microcomputer control device 1 sleeve of the charger;
the second charger is provided with a microcomputer control device 1 sleeve of the charger.
Optionally, the direct current system monitoring device is connected with the first charger microcomputer control device through the communication interface 1, is connected with the second charger microcomputer control device through the communication interface 2, and is connected with the direct current system running state monitoring device through the communication interface 3.
Optionally, the first charging machine direct current bus side isolating switch 1ZK is provided with 2 main loop contacts, and is provided with one auxiliary contact for separating and combining the position of the first charging machine direct current bus side isolating switch 1ZK, and is connected to a direct current system running state monitoring device;
the second charging machine direct current bus side isolating switch 2ZK is provided with 2 main loop contacts, and is provided with one auxiliary contact for separating and combining the position of the second charging machine direct current bus side isolating switch 2ZK, and is connected to a direct current system running state monitoring device;
the first storage battery isolating switch 3ZK is provided with 2 main loop contacts, is provided with one auxiliary contact for separating and combining the position of the first storage battery isolating switch 3ZK, and is connected to a direct current system running state monitoring device;
The second storage battery isolating switch 4ZK is provided with 2 main loop contacts, is provided with one auxiliary contact for separating and combining the position of the second storage battery isolating switch 4ZK, and is connected to a direct current system running state monitoring device;
the bus tie isolating switch 5ZK is provided with 2 main loop contacts, and is provided with one auxiliary contact for the position of the bus tie isolating switch 5ZK and one auxiliary contact for the position of the bus tie isolating switch 5ZK, and is connected to a direct current system running state monitoring device.
From the above technical solutions, the embodiment of the present invention has the following advantages:
the embodiment of the invention provides a method for monitoring the running mode of a direct current system and the state of an isolating switch, wherein the method for monitoring the running mode of the direct current system and the state of the isolating switch comprises the following steps: s1: the running state monitoring device of the direct current system is characterized by calculating the voltage difference of voltages at two sides of a bus tie isolation switch 5ZK, a first charger direct current bus side isolation switch 1ZK, a second charger direct current bus side isolation switch 2ZK, a first storage battery isolation switch 3ZK and a second storage battery isolation switch 4ZK, and measuring the position signals of the bus tie isolation switch 5ZK, the first charger direct current bus side isolation switch 1ZK, the second charger direct current bus side isolation switch 2ZK, the first storage battery isolation switch 3ZK, the current passed by the second storage battery isolation switch 4ZK and the auxiliary contact of the identification isolation switch; s2: the running state monitoring device of the direct current system determines that the bus tie isolating switch 5ZK, the first charging machine direct current bus side isolating switch 1ZK, the second charging machine direct current bus side isolating switch 2ZK, the first storage battery isolating switch 3ZK and the second storage battery isolating switch 4ZK are correctly opened and closed according to the voltage difference, the current and the position signal combined with a preset switch position auxiliary contact judging method or a preset isolating switch loop current judging method or a preset isolating switch two-side voltage difference judging method or a preset combination analysis judging method. Wherein, direct current system includes: a first section bus and a second section bus; the first storage battery circuit is connected with the first storage battery through the first storage battery circuit; the second section of bus is connected with a second charger through a second charger loop, and the second section of bus is connected with a second storage battery through a second storage battery loop; the first section of bus and the second section of bus are connected through a bus tie isolating switch 5 ZK; the first charger loop is provided with a first charger direct current bus side isolating switch 1ZK; the first storage battery loop is provided with a first storage battery isolating switch 3ZK; the second charger loop is provided with a second charger direct current bus side isolating switch 2ZK; the second storage battery loop is provided with a second storage battery isolating switch 4ZK; the direct current system is provided with a direct current system monitoring device, a first charger microcomputer control device, a second charger microcomputer control device and a direct current system running state monitoring device; the direct current system monitoring device in the direct current system is connected with the first charger microcomputer control device through the communication interface 1, is connected with the second charger microcomputer control device through the communication interface 2, and is connected with the direct current system running state monitoring device through the communication interface 3. The method monitors the correctness of the opening and closing positions of the isolating switches 1ZK, 2ZK, 3ZK, 4ZK and 5ZK under different operation modes to determine whether the operation mode of the direct current system is normal, and when the opening or closing positions of the isolating switches are incorrect or the operation mode of the direct current system is incorrect, an alarm signal is sent, so that the power system is prevented from being failed when the direct current system is in an abnormal operation state, the phenomenon of refusal caused by the loss of the direct current power supply is prevented, and the technical problems of serious potential safety hazard and low safety reliability existing at present are solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a main wiring of a DC power system;
FIG. 2 is a schematic diagram of a current loop of a DC power system;
FIG. 3 is a schematic diagram of a current loop of a current DC power supply system # 1 charger and a battery in an overhauling state;
fig. 4 is a schematic diagram of a dc system according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for monitoring the operation mode of the DC system and the operation state of the isolating switch;
fig. 6 is a schematic diagram of charge and discharge characteristics of the dc power supply device.
FIG. 7 is a schematic diagram of a network connection of a monitoring system for the operation mode of a DC system and the operation state of an isolating switch according to an embodiment of the present invention;
fig. 8 is a schematic diagram of input and output loop connection of a dc system operation mode and an isolation switch operation state monitoring device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a direct current system operation mode and an isolating switch state monitoring method, which solve the technical problems of serious potential safety hazard and low safety reliability in the prior art.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 4, an embodiment of a dc system provided in an embodiment of the present invention includes:
the following description will first explain illustration, a first bus bar (I-section bus bar in the illustration), a second bus bar (II-section bus bar in the illustration), a first charger (# 1 charger in the illustration), a second charger (# 2 charger in the illustration), a first battery (# 1 battery in the illustration), and a second battery (# 2 battery in the illustration).
A first bus bar (a section I bus bar in the figure) and a second bus bar (a section II bus bar in the figure);
the first storage battery circuit is connected with the first storage battery through the first storage battery circuit;
the second section of bus is connected with a second charger through a second charger loop, and the second section of bus is connected with a second storage battery through a second storage battery loop;
the first section of bus and the second section of bus are connected through a bus tie isolating switch 5 ZK;
the first charger loop is provided with a first charger direct current bus side isolating switch 1ZK;
the first storage battery loop is provided with a first storage battery isolating switch 3ZK;
the second charger loop is provided with a second charger direct current bus side isolating switch 2ZK;
the second battery circuit is provided with a second battery isolating switch 4ZK.
Further, the first charging machine direct current bus side isolating switch 1ZK is provided with 2 main loop contacts, and the auxiliary contacts of the first charging machine direct current bus side isolating switch 1ZK are respectively positioned at one position and one position.
Further, the second charging machine direct current bus side isolating switch 2ZK is provided with 2 main loop contacts, and the auxiliary contacts of the second charging machine direct current bus side isolating switch 2ZK are respectively positioned at one position and one position.
Further, the first battery disconnecting switch 3ZK has 2 main loop contacts, and is configured with one each of the position auxiliary contacts of the first battery disconnecting switch 3 ZK.
Further, the second battery disconnecting switch 4ZK has 2 main loop contacts, and is configured with one position auxiliary contact of the second battery disconnecting switch 4ZK for each of the split and the combined positions.
Further, the bus tie isolation switch 5ZK has 2 main loop contacts, and is configured with one each of the auxiliary contacts of the bus tie isolation switch 5 ZK.
For a clearer description, the dc system is further described below with reference to fig. 7 and 8:
as shown in fig. 7, the dc system is provided with a dc system monitoring device 1 set, a dc system operating state monitoring device 1 set, a dc system first charger microcomputer control device 1 set, and a dc system second charger microcomputer control device 1 set. The direct current system monitoring device is connected with the first charger microcomputer control device through the communication interface 1, is connected with the second charger microcomputer control device through the communication interface 2, and is connected with the direct current system running state monitoring device through the communication interface 3.
As shown in fig. 7 and 8, the dc power system operation mode and the voltage and current information normally monitored by the isolation switch state monitoring system are as follows: the output-voltage PV11 and the current PA11 of the #1 direct-current storage battery pack, the output-voltage PV12 and the current PA12 of the I section bus of the direct-current system, the output-voltage PV13 and the current PA13 of the #1 charger, the output-voltage PV21 and the current PA21 of the #2 direct-current storage battery pack, the output-voltage PV22 and the current PA22 of the II section bus of the direct-current system, and the output-voltage PV23 and the current PA23 of the #2 charger.
U1 is the monitoring voltage of a direct current bus side isolating switch of a direct current power supply system # 1 charger, and PV13;
u2 is the monitoring voltage of a direct current bus side isolating switch of a direct current power supply system #2 charger, and PV23;
u3 is the monitoring voltage of the isolating switch of the storage battery # 1 of the direct-current power supply system, and PV11;
u4 is the monitoring voltage of a storage battery disconnecting switch of a direct-current power supply system (DC power supply system) input #2, and PV21;
u5 is the monitoring voltage of the bus tie isolating switch of the direct current power supply system # 1, and PV12;
u6 is the monitoring voltage of the bus tie isolating switch of the direct current power supply system #2, and PV22;
i1 is direct current for monitoring direct current bus side isolation switch loop current of a direct current power supply system # 1 charger, and PA13;
i2 is direct current monitored by direct current bus side isolation switch loop current of a direct current power supply system #2 charger, and PA23;
i3 is direct current which is monitored by the current of a isolating switch loop of a storage battery # 1 of the direct current power supply system, and PA11;
i4 is direct current of the direct current power supply system, namely #2 storage battery isolating switch loop current monitoring, PA21;
i5 is direct current monitored by a bus tie isolation switch loop current of the direct current power supply system # 1, and PA12;
i6 is direct current monitored by a direct current power system #2 bus tie isolation switch loop current, and PA22;
1ZK is a direct current power supply system # 1 charger throw direct current bus side isolating switch, 2 main loop contacts of the 1ZK isolating switch are required to be provided with one auxiliary contact of the 1ZK position for separating and combining the positions and are connected into a direct current power supply system operation mode and an isolating switch state monitoring system;
2ZK is a direct current power supply system #2 charger direct current bus side isolating switch, 2ZK isolating switch main loop contacts are 2, and the 2ZK position auxiliary contacts are required to be respectively separated and combined and are connected into a direct current power supply system operation mode and an isolating switch state monitoring system;
3ZK is a storage battery disconnecting switch of a direct current power supply system switching # 1, 2 main loop contacts of the 3ZK disconnecting switch are required to be provided with one auxiliary contact of the 3ZK position for separating and combining the position and connected to a running mode of the direct current power supply system and a disconnecting switch state monitoring system;
4ZK is a storage battery disconnecting switch of a direct current power supply system switching #2, 2 main loop contacts of the 4ZK disconnecting switch are required to be provided with one auxiliary contact of the 4ZK position for separating and combining the position and connected to a running mode of the direct current power supply system and a disconnecting switch state monitoring system;
the 5ZK is a busbar interconnecting isolating switch of the direct current power supply system, 2 contacts of a main loop of the 5ZK isolating switch are required to be provided with one auxiliary contact of the 5ZK position for separating and combining the position and connected to a running mode of the direct current power supply system and an isolating switch state monitoring system;
A method for monitoring the operation mode and the state of the isolating switch of a direct current system will be described, and one embodiment of the method for monitoring the operation mode and the state of the isolating switch of a direct current system includes:
s0: determining the normal operation of a direct current system;
the first section bus and the second section bus adopt a split operation state when the direct current system normally operates, at the moment, the bus contact isolating switch 5ZK is in an open state, the first charger is connected with the direct current bus side isolating switch 1ZK, the second charger is connected with the direct current bus side isolating switch 2ZK, the first storage battery isolating switch 3ZK and the second storage battery isolating switch 4ZK and are in a closed state, and the first storage battery, the first charger, the second storage battery and the second charger are in a floating charging mode under the normal operation state of the direct current system. In the floating state, when the closing and opening states of the isolating switch are not in accordance with the above regulations, an alarm signal is sent out.
When the direct current system meets the uniform charging condition, the first charger and the second charger enter a uniform charging mode, and the first charger and the second charger charge the first storage battery and the second storage battery respectively. In the uniform charging state, when the closing and opening states of the isolating switch are not in accordance with the stipulations, an alarm signal is sent out;
When the first storage battery connected with the first section of bus needs the storage battery nuclear capacity, the first charging machine loop breaks down and needs equipment maintenance, and the first storage battery pack or the first charging machine loop all need to be separated from the system for working, the bus connecting isolating switch 5ZK is firstly closed, the parallel operation state of the first section of bus and the second section of bus is realized, after the bus connecting isolating switch 5ZK is confirmed to be completely closed, the first charging machine direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are disconnected, at the moment, the second charging machine direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK are positioned in the closed state, and the equipment maintenance or the storage battery nuclear capacity working can be carried out after the first charging machine direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are confirmed to be completely disconnected. In the process, when the closing and opening states of the isolating switch are not in accordance with the stipulations, an alarm signal is sent out;
when the maintenance or the recovery process after the storage battery nuclear capacity work is completed is to firstly close the first charging machine direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK, after the first charging machine direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are confirmed to be completely closed, the bus tie isolating switch 5ZK is disconnected, and after the bus tie isolating switch 5ZK is confirmed to be completely disconnected, the direct current system is recovered to a normal running state. In the process, when the closing and opening states of the isolating switch are not in accordance with the stipulations, an alarm signal is sent out;
When the second storage battery connected with the two sections of buses needs the storage battery nuclear capacity, the second charger loop breaks down and needs equipment maintenance, and the second storage battery pack or the second charger loop is disconnected and needs to be separated from the system to work, the bus connecting isolating switch 5ZK is firstly closed to realize the parallel running state of the direct current buses, after the bus connecting isolating switch 5ZK is confirmed to be closed completely, the second charger is disconnected to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK, at the moment, the first charger is thrown the direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK isolating switch are positioned in the closed state, and after the second charger is confirmed to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK to be completely disconnected, equipment maintenance or storage battery nuclear capacity work can be carried out. In the process, when the closing and opening states of the isolating switch are not in accordance with the stipulations, an alarm signal is sent out;
when the equipment maintenance or the recovery process after the storage battery nuclear capacity work is completed, the second charger is firstly closed to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK, after the second charger is confirmed to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK to be closed completely, the bus contact isolating switch 5ZK is disconnected, and after the bus contact isolating switch 5ZK is confirmed to be completely disconnected, the direct current system is recovered to a normal running state. In the process, when the closing and opening states of the isolating switch are not in accordance with the stipulations, an alarm signal is sent out;
When the system meets the uniform charging condition, the storage battery and the charger enter a uniform charging mode, the charger charges the storage battery uniformly, and the running state of the direct current system is shown in figure 6 according to the general technical condition and safety requirement of the direct current power supply equipment of GB/T19826-2014 electric power engineering.
The above operation process has several limiting conditions, and the operation is not performed when the communication is abnormal; when the voltage difference between the two sections of storage batteries is too large, the operation is not performed; the battery cannot be operated when the charge-discharge current is large.
S1: the running state monitoring device of the direct current system is characterized by calculating the voltage difference of voltages at two sides of a bus tie isolation switch 5ZK, a first charger direct current bus side isolation switch 1ZK, a second charger direct current bus side isolation switch 2ZK, a first storage battery isolation switch 3ZK and a second storage battery isolation switch 4ZK, measuring the current passing through the bus tie isolation switch 5ZK, the first charger direct current bus side isolation switch 1ZK, the second charger direct current bus side isolation switch 2ZK, the first storage battery isolation switch 3ZK and the second storage battery isolation switch 4ZK and identifying the position signal of an auxiliary contact of the isolation switch;
s2: the running state monitoring device of the direct current system determines whether the opening or closing operation of the bus tie isolating switch 5ZK, the first charging machine direct current bus side isolating switch 1ZK, the second charging machine direct current bus side isolating switch 2ZK, the first storage battery isolating switch 3ZK and the second storage battery isolating switch 4ZK is correct or not according to all voltage differences, currents and position signals and a preset switch position auxiliary contact judging method or a preset isolating switch loop current judging method or a preset isolating switch two-side voltage difference judging method or a preset combination analysis judging method, and incorrectly sends an alarm signal.
Optionally, in step S2, the voltage difference and the current may be measured and calculated by actively starting a homogeneous charge operation mode, and measuring and calculating the voltage difference and the current in the homogeneous charge operation mode.
Optionally, in a normal running state of the direct current system, when the direct current system monitoring device reaches to periodically start the uniform charging operation, the direct current system monitoring device sends a start uniform charging command to the first microcomputer control device of the charger through the communication interface 1, sends a start uniform charging command to the second microcomputer control device of the charger through the communication interface 2, sends a started signal to the direct current system running state monitoring device through the communication interface 3, and starts the direct current system running mode and the isolating switch state monitoring function after receiving the signal by the direct current system running state monitoring device to monitor the actual running state of the isolating switch and judge whether the running mode of the direct current system is correct or not.
Optionally, in the normal running state of the direct current system, the running state monitoring device of the direct current system periodically starts the running mode of the direct current system and the monitoring function of the state of the isolating switch according to the set time interval T1 to monitor the actual working state of the isolating switch and judge whether the running mode of the direct current system is correct or not.
Optionally, when any one of the 1ZK, 2ZK, 3ZK, 4ZK and 5XK disconnecting switch dividing and combining signals monitored in real time by the direct current system running state monitoring device is changed, the direct current system running mode and the disconnecting switch state monitoring function are immediately started, and the actual working state monitoring of the disconnecting switch and the judgment of whether the direct current system running mode is correct or not are carried out.
In this embodiment, the following auxiliary contact judgment method or preset isolation switch loop current judgment method or preset isolation switch two-side differential pressure judgment method or preset combination analysis judgment method is adopted in the running state of the direct current system, so as to be used for rapidly and effectively judging whether the isolation switch is completely opened or closed, particularly how rapidly and effectively judging the effectiveness of the isolation switch operation, and finding potential errors and hidden dangers in the isolation switch opening or closing operation, such as violating the operation principle, violating the running principle and the like.
A. Switch position auxiliary contact judgment method
The isolating switch is required to have 1 closed auxiliary contact and 1 open auxiliary contact, and when the isolating switch is operated (opened or closed), the auxiliary contacts are synchronously collected, and the state of the isolating switch is judged according to the switching value signal. The judgment method is shown in the following table 1:
TABLE 1
The working state of the isolating switch is judged by adopting the two-position auxiliary contact, so that misjudgment of the action abnormality of the auxiliary contact of the isolating switch or the abnormality of the wiring of a loop or the abnormality of a device is prevented.
When the isolating switch is operated, the main contact and the auxiliary contact of the isolating switch are possibly asynchronous or not connected due to mechanical loop reasons or other reasons, so that the actual working state of the main loop contact of the isolating switch, namely the actual working state of the isolating switch, cannot be correctly reflected by judging the position of the auxiliary contact, and other principle criteria are required to be supplemented for joint judgment.
B. Isolation switch loop current judging method
When the disconnecting switch is switched on or off, the current of the related loop can be measured according to the direct current load, the floating charge state or the uniform charge state carried by the direct current system, and the completeness of the switching on and off of the disconnecting switch can be judged.
When the disconnector has completed the opening operation, the current through the feed loop should be zero.
When the disconnecting switch is closed, the current flowing through the feeding loop should be greater than or equal to zero.
The current difference value of all isolating switch loops can be measured in normal running state during normal floating charge and automatic charge so as to judge whether the running state of all isolating switches is normal.
The current difference of all isolating switch loops can be measured by adopting a starting system uniform charging mode (manual and remote automatic) to judge whether the running states of all isolating switches are normal or not. When the I1, the I3 and the I5 are smaller than the setting value IN1, if the U1, the U3 and the U5 are larger than the setting value UN1, the direct current system running state monitoring device sends a starting # 1 charging machine uniform charging command to the direct current system monitoring device through the communication port, the direct current system monitoring device sends a #1 charging machine starting uniform charging command to the first charging machine microcomputer control device through the communication port after receiving the command, and the #1 charging machine starts uniform charging after receiving the command; when I2, I4 and I6 are smaller than the setting value IN1, if U2, U4 and U5 are larger than the setting value UN1, the direct current system running state monitoring device sends a starting #2 charging machine uniform charging command to the direct current system monitoring device through the communication port, the direct current system monitoring device sends a #2 charging machine starting uniform charging command to the second charging machine microcomputer control device through the communication port after receiving the command, and the #2 charging machine starts uniform charging after receiving the command.
The current of these loops was measured using a direct current sensor, including but not limited to hall current sensors, precision shunts, precision resistors, etc., as in table 2 below.
TABLE 2
Here, the current i=0 is considered to be the current i=0 when the absolute value of the current I is smaller than a certain set value, and the current i+.0 is considered to be the current i+.0 when the absolute value of the current I is larger than a certain set value.
C. Method for judging pressure difference of two sides of isolating switch
When the disconnecting switch is switched on or off, the working state of the disconnecting switch can be judged according to the voltage difference value of the two sides of the main contact point of the disconnecting switch, namely whether the disconnecting switch is switched on completely or off completely is judged.
The voltage difference values of the two sides of the main contact points of all the isolating switches can be measured in normal running states during normal floating charge and automatic charge so as to judge whether the running states of all the isolating switches are normal.
The method can also adopt a starting system uniform charging mode (manual and remote automatic) to measure the voltage difference values at two sides of the main contact points of all the isolating switches so as to judge whether the running states of all the isolating switches are normal.
Other modes of increasing the voltage difference between the output voltage of the charger and the voltage of the direct current bus and increasing the voltage difference between the output voltage of the charger and the voltage of the direct current storage battery can be adopted, so that the voltage difference at two sides of the main contact point of all the isolating switches is measured, and whether the running states of all the isolating switches are normal or not is judged. Table 3 below:
TABLE 3 Table 3
The voltage u=0 is considered to be voltage u=0 when the absolute value of the voltage U is smaller than a certain set value, and the voltage U noteq 0 is considered to be voltage U noteq 0 when the absolute value of the voltage U is larger than a certain set value.
D. Combined analysis and judgment method
1. State analysis of each isolating switch
The combination judgment is performed according to the above method, and the following is performed according to table 4:
TABLE 4 Table 4
Judging the poor contact of the 5ZK isolating switch: as shown in table 5, when the dc system is in parallel operation, the 5ZK isolation switch should be in a closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 5ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a voltage difference value measurement conclusion of the two sides of the 5ZK isolating switch as |U5-U6|noteq0 through a differential pressure judging method of the two sides of the isolating switch, and simultaneously the direct current system running state monitoring device calculates a current measurement conclusion of the 5ZK loop as I5=I6 noteq 0 through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the contact of the 5ZK isolating switch is poor. The phenomenon of poor contact of the 5ZK isolating switch comprises abnormal connection of connection loop wires between voltage measuring points on two sides of the 5ZK isolating switch.
Unexpected disconnection judgment of 5ZK isolating switch: as shown in table 6, when the dc system is in parallel operation, the 5ZK isolation switch should be in a closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 5ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a voltage difference value measurement conclusion of the two sides of the 5ZK isolating switch as |U5-U6|noteq0 through a differential pressure judging method of the two sides of the isolating switch, and simultaneously the direct current system running state monitoring device calculates a current measurement conclusion of the 5ZK loop as I5=I6=0 through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 5ZK isolating switch is not disconnected by expectancy. The unexpected disconnection phenomenon of the 5ZK isolating switch comprises disconnection of connection loop wires between voltage measuring points on two sides of the 5 ZK.
Judging the poor contact of the 1ZK isolating switch: as shown in table 5, when the dc system is in the normal operation mode, the 1ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 1ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a conclusion of I U1-U5I not equal to 0 for the voltage difference value measurement on two sides of the 1ZK isolating switch through a differential pressure judging method on two sides of the isolating switch, and simultaneously the direct current system running state monitoring device calculates a conclusion of I1 not equal to 0 for the 1ZK loop current through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the contact of the 1ZK isolating switch is bad, and a risk alarm signal that the contact of the 1ZK isolating switch is bad and the first charger loop is separated from the direct current system is sent out. The poor contact phenomenon of the 1ZK isolating switch comprises abnormal connection of the connection loop wiring between the voltage measuring points on the two sides of the 1 ZK.
Unexpected disconnection judgment of 1ZK isolating switch: as shown in table 6, when the dc system is in the normal operation mode, the 1ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 1ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a voltage difference value measurement conclusion of the two sides of the 1ZK isolating switch to be |U1-U5|noteq0 through a differential pressure judging method of the two sides of the isolating switch, and simultaneously the direct current system running state monitoring device calculates a current measurement conclusion of the 1ZK loop to be I1=0 through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 1ZK isolating switch is not expected to be opened, and a risk warning signal that the 1ZK isolating switch is not expected to be opened and the first charger loop is separated from the direct current system is sent. The unexpected disconnection phenomenon of the 1ZK isolating switch comprises disconnection of connection loop wires between voltage measuring points on two sides of the 1 ZK.
3ZK disconnecting switch contact failure judgment: as shown in table 5, when the dc system is in the normal operation mode, the 3ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the 3ZK isolating switch state to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of a switch-on state auxiliary contact is 1, and a switch value signal of a switch-off state auxiliary contact is 0, as shown in a table 1; secondly, the direct current system running state monitoring device measures and calculates the voltage difference value at two sides of the 3ZK isolating switch to be |U3-U5|noteq0 through a differential pressure judging method at two sides of the isolating switch, and meanwhile, the direct current system running state monitoring device measures and calculates the current of the 3ZK loop to be I3 noteq 0 through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 3ZK isolating switch is in poor contact, and a warning signal of the 3ZK isolating switch in poor contact and the first storage battery loop with the disconnection risk is sent. The phenomenon of poor contact of the 3ZK isolating switch comprises abnormal connection of connection loop wires between voltage measuring points on two sides of the 3 ZK.
3ZK disconnecting switch unexpected disconnection judgment: as shown in table 6, when the dc system is in the normal operation mode, the 3ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the 3ZK isolating switch state to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of a switch-on state auxiliary contact is 1, and a switch value signal of a switch-off state auxiliary contact is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a voltage difference value measurement conclusion of the two sides of the 3ZK isolating switch to be |U3-U5|noteq0 through a differential pressure judging method of the two sides of the isolating switch, and meanwhile, the direct current system running state monitoring device calculates a current measurement conclusion of the 3ZK loop to be I3=0 through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 3ZK isolating switch is not expected to be opened, and a risk warning signal that the 3ZK isolating switch is not expected to be opened and the first storage battery loop is separated is sent. The unexpected disconnection phenomenon of the 3ZK isolating switch comprises disconnection of connection loop wires between voltage measuring points on two sides of the 3 ZK.
Judging the poor contact of the 2ZK isolating switch: as shown in table 5, when the dc system is in the normal operation mode, the 2ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 2ZK isolating switch to be in a perfect state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closed state is 1, and a switch value signal of an auxiliary contact in an open state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a voltage difference value measurement conclusion of the two sides of the 2ZK isolating switch to be |U2-U6|noteq0 through a differential pressure judging method of the two sides of the isolating switch, and meanwhile, the direct current system running state monitoring device calculates a current measurement conclusion of the 2ZK loop to be i2 noteq 0 through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the contact of the 2ZK isolating switch is bad, and a risk alarm signal that the contact of the 2ZK isolating switch is bad and the second charger loop is separated from the direct current system is sent out. The poor contact phenomenon of the 2ZK isolating switch comprises abnormal connection of connection loops between voltage measuring points on two sides of the 2ZK isolating switch.
Unexpected disconnection judgment of the 2ZK isolating switch: as shown in table 6, when the dc system is in the normal operation mode, the 2ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 2ZK isolating switch to be in a perfect state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closed state is 1, and a switch value signal of an auxiliary contact in an open state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a voltage difference value measurement conclusion of the two sides of the 2ZK isolating switch to be |U2-U6|noteq0 through a differential pressure judging method of the two sides of the isolating switch, and simultaneously the direct current system running state monitoring device calculates a current measurement conclusion of the 2ZK loop to be I2=0 through a isolating switch loop current judging method; and the comprehensive judgment result of the direct current system running state monitoring device is that the 2ZK isolating switch is not expected to be opened, and a risk warning signal that the 2ZK isolating switch is not expected to be opened and the second charger loop is separated from the direct current system is sent. The unexpected disconnection phenomenon of the 2ZK isolating switch comprises disconnection of connection loop wires between voltage measuring points on two sides of the 2 ZK.
Judging the poor contact of the 4ZK isolating switch: as shown in table 5, when the dc system is in the normal operation mode, the 4ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 4ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a conclusion of |U4-U6| with respect to the voltage difference value measurement at two sides of the 4ZK isolating switch as being not equal to 0 through a differential pressure judging method at two sides of the isolating switch, and simultaneously the direct current system running state monitoring device calculates a conclusion of I4 not equal to 0 with respect to the 4ZK loop current through a isolating switch loop current judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the contact of the 4ZK isolating switch is bad, and an alarm signal of the contact of the 4ZK isolating switch and the risk of detachment of the second storage battery loop is sent. The poor contact phenomenon of the 4ZK isolating switch comprises abnormal connection of the connection loop wires between the voltage measuring points on the two sides of the 4ZK isolating switch.
Unexpected disconnection judgment of 4ZK isolating switch: as shown in table 6, when the dc system is in the normal operation mode, the 4ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 4ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device calculates a voltage difference value measurement conclusion of the two sides of the 4ZK isolating switch to be |U4-U6|noteq0 through a differential pressure judging method of the two sides of the isolating switch, and meanwhile, the direct current system running state monitoring device calculates a current measurement conclusion of the 4ZK loop to be I4=0 through a isolating switch loop current judging method; and the comprehensive judgment result of the direct current system running state monitoring device is that the 4ZK isolating switch is not expected to be opened, and a risk warning signal for the unexpected opening of the 4ZK isolating switch and the disconnection of the second storage battery loop is sent. The unexpected disconnection phenomenon of the 4ZK isolating switch comprises disconnection of connection loop wires between voltage measuring points on two sides of the 4 ZK.
And judging the disconnection of the partial wiring from the voltage measuring point of the 1ZK loop U1 to the first charger: as shown in table 7, when the dc system is in the normal operation mode, the 1ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 1ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device measures and concludes I1 = 0 for the 1ZK loop current through a disconnecting switch loop current judging method, and simultaneously, the direct current system running state monitoring device measures and computes and concludes I U1-U5I = 0 for the voltage difference value at two sides of the 1ZK disconnecting switch through a disconnecting switch two-side pressure difference judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 1ZK isolating switch is completely closed, the connection from the U1 voltage measuring point of the 1ZK loop to the first charger part is disconnected, and a first charger loop disconnection alarm signal is sent.
3ZK loop U3 voltage measurement point to first storage battery part wiring disconnection judgment: as shown in table 7, when the dc system is in the normal operation mode, the 3ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the 3ZK isolating switch state to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of a switch-on state auxiliary contact is 1, and a switch value signal of a switch-off state auxiliary contact is 0, as shown in a table 1; secondly, the direct current system running state monitoring device measures and concludes I3 = 0 for the 3ZK loop current through a disconnecting switch loop current judging method, and simultaneously, the direct current system running state monitoring device measures and computes and concludes I U3-U5I = 0 for the voltage difference value at two sides of the 3ZK disconnecting switch through a disconnecting switch two-side pressure difference judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 3ZK isolating switch is completely closed, the connection between the U3 voltage measuring point of the 3ZK loop and the first storage battery part is disconnected, and an alarm signal of the disconnection of the first storage battery loop or the open circuit of the storage battery is sent.
And judging the disconnection of the partial wiring from the voltage measuring point of the 2ZK loop U2 to the second charger: as shown in table 7, when the dc system is in the normal operation mode, the 2ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 2ZK isolating switch to be in a perfect state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closed state is 1, and a switch value signal of an auxiliary contact in an open state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device measures and concludes I2 = 0 for the 2ZK loop current through a disconnecting switch loop current judging method, and simultaneously, the direct current system running state monitoring device measures and computes and concludes I U2-U6I = 0 for the voltage difference value at two sides of the 2ZK disconnecting switch through a disconnecting switch two-side pressure difference judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 2ZK isolating switch is completely closed, the connection from the U2 voltage measuring point of the 2ZK loop to the second charger part is disconnected, and a second charger loop disconnection alarm signal is sent.
And judging the disconnection of the connection from the voltage measuring point of the 4ZK loop U4 to the first storage battery part: as shown in table 7, when the dc system is in the normal operation mode, the 4ZK isolation switch should be in the closed state. Firstly, when the running state monitoring device of the direct current system judges the state of the 4ZK isolating switch to be in good closing state through a switch position auxiliary contact judging method, namely, a switch value signal of an auxiliary contact in a closing state is 1, and a switch value signal of an auxiliary contact in an opening state is 0, as shown in a table 1; secondly, the direct current system running state monitoring device measures and concludes I4 = 0 for the 4ZK loop current through a disconnecting switch loop current judging method, and simultaneously, the direct current system running state monitoring device measures and computes and concludes I U4-U6I = 0 for the voltage difference value at two sides of the 4ZK disconnecting switch through a disconnecting switch two-side pressure difference judging method; the comprehensive judgment result of the direct current system running state monitoring device is that the 4ZK isolating switch is completely closed, the connection between the U4 voltage measuring point of the 4ZK loop and the second storage battery part is disconnected, and a warning signal of the disconnection of the second storage battery loop or the open circuit of the storage battery is sent.
The determination of the poor contact combination of the isolating switch is carried out according to the method, and the conclusion table 5 is as follows:
TABLE 5
The unexpected disconnection combination judgment of the isolating switch is carried out according to the method, and the conclusion table 6 is as follows:
TABLE 6
According to the method, the connection disconnection combination judgment from the voltage measuring points of the 1ZK and 2ZK isolating switch circuits to the part of the charger is carried out, and the connection disconnection combination judgment from the voltage measuring points of the 3ZK and 4ZK isolating switch circuits to the part of the storage battery is carried out as follows:
TABLE 7
Also, the unexpected closing combination judgment of the isolating switch is carried out according to the method, and the conclusion table 8 is as follows:
TABLE 8
When the direct current system is normally operated and is in floating charge, the voltage difference, the current and the position signals can be judged, and if the disconnecting switch is in poor contact or unexpected disconnection, or the disconnecting switch is in poor contact or unexpected closing state at other positions of a loop, or the connecting wire at other positions of the loop is disconnected, the result of the judgment algorithm can be obtained, and the fixed value of the judgment algorithm can be independently set.
When the direct current system is charged normally, the voltage difference, the current and the position signals can be judged, if the disconnecting switch is in poor contact or unexpected opening or unexpected closing, or if the disconnecting switch is in poor contact at other positions of the circuit or wiring at other positions of the circuit is open, the result of the judging algorithm can be obtained, and the fixed value of the judging algorithm can be independently set.
According to the method, combination analysis and judgment are carried out according to the state conditions of the isolating switches, and the pressure difference at two sides of the contact, the passing current and the auxiliary contact position signals are combined, so that the situation that the contact is not in place or is not opened or is closed or is not expected or the situation that other positions of a loop are in poor contact or are opened can be accurately and effectively found, and the situation that error leakage occurs in judgment caused by a single method is avoided. The judgment flow chart is shown in fig. 5.
2. DC system running state and isolating switch operation result analysis
The normal operation of the direct current system is changed into the operation of a #1 charger, the operation of a #1 storage battery, the operation of a #2 charger and the operation of a #2 storage battery, and then the operation of the #1 charger is changed into the operation of the #1 storage battery, the operation of the #2 charger and the operation of the #2 storage battery, and the operation rules and the switching logic according to the direct current operation mode are as shown in the following table 9:
TABLE 9
The normal operation of the direct current system is changed into the operation of the #2 charger, the operation of the #2 storage battery, the operation of the #1 charger and the operation of the #1 storage battery, and then the normal operation of the #2 charger, the recovery operation of the #2 storage battery, the operation of the #1 charger and the operation of the #1 storage battery, and the rules and switching logic of the direct current operation mode operation are shown in the following table 10:
table 10
The following measures can be taken from the above operation process: the logic is 'combined bus-tie- & gt storage battery deactivation- & gt charging machine recovery- & gt storage battery recovery- & gt bus-tie disconnection', whether actual operation accords with the logic or not can be monitored in real time through tracking and analyzing the states of the isolating switches, an operator is guided to execute according to a correct operation process, and incorrect operation which does not accord with the operation process is prompted, so that the situation of incorrect operation leakage is avoided.
3. DC system operation risk analysis
When the single direct current system operates independently (# 1 operates as only 1ZK, 3ZK and 5ZK, and #2 operates as only 2ZK, 4ZK and 5ZK, and the positions of the isolating switches are different and represent different risk degrees under different working states, for example: in the normal operation state of the bus bar division shown in the system operation state 1 shown in table 5 or table 6, when the battery isolating switches 3ZK and 4ZK are not closed, the risk that the battery is separated from the bus bar exists, and prompt is needed. At least 1 of the battery charger isolating switch, the storage battery isolating switch, the bus isolating switch, the storage battery isolating switch combination and the bus isolating switch and the storage battery isolating switch combination of the direct current system are closed, the direct current system can operate and provide power for loads, but the risk of voltage loss of the direct current system exists, and the risk degree is different. When the direct current system is in different running states, the risk degree of each isolating switch is different, and the invention judges and prompts the risk classification of the direct current system according to the following table 11.
TABLE 11
The method has the advantages that the fixed value table of the isolating switch can be set according to the running state of the system, and after the isolating switch is subjected to the switching-on and switching-off operation, the risk classification prompt is provided for the running mode of the system by rapidly and accurately judging the states of the isolating switches, so that the safe and reliable running of the system is ensured.
The analysis method can be realized by the following steps:
1. the three methods are used for jointly judging whether the isolating switch is completely opened or closed or not and whether the isolating switch has poor contact or not by calculating the voltage difference of voltages at two sides of the isolating switch, measuring the current passing through the isolating switch and identifying the position signal of an auxiliary contact of the isolating switch, so that the situation of error leakage is avoided, and the accuracy and the reliability of analysis and judgment are improved;
2. through the combined analysis of the current position states of the 5 isolating switches (1 ZK-5 ZK), potential errors and fault hidden dangers in the switching process are analyzed and found according to the rules and switching logic operated by the running mode of the direct current power supply, accidents caused by human judgment errors can be reduced, and the overall running reliability of the direct current system is improved;
3. through the risk assessment of the running mode of the direct current system, unpredictable faults can be effectively prevented, such as: the connection state of the storage battery pack and the direct current bus is monitored, the situation that the storage battery pack is separated from the bus unpredictably is prevented, and accident potential caused by the situation is reduced. And the following steps: and the connection state between the charger and the storage battery pack is monitored, the phenomenon of overdischarge of the storage battery pack is prevented, and the accident potential caused by the phenomenon is reduced.
It should be noted that, the above analysis method is generally performed in a normal floating charge state, or the active start of the homogeneous charge or the active judgment of the homogeneous charge state may be performed by the real-time running state monitoring device of the dc system to perform active judgment and analysis, detect the running state of the dc system in time, discover the risk in time, and give an alarm signal. When the charging is started, the charging voltage and the charging current are changed, the charging current value is larger, the charging voltage value is also higher, the voltage and current measurement is facilitated, and the abnormal state of the isolating switch is found more forcefully.
1. The three methods are used for jointly judging whether the isolating switch is completely opened or closed or not by calculating the voltage difference of voltages at two sides of the isolating switch, measuring the current passing through the isolating switch and identifying the position signal of an auxiliary contact of the isolating switch, so that the situation of error leakage is avoided, and the accuracy and the reliability of analysis and judgment are improved;
2. through the combined analysis of the current position states of the 5 isolating switches (1 ZK1-5 ZK), the potential errors and fault hidden dangers in the switching process are analyzed and found according to the rules and switching logic operated by the running mode of the direct current power supply, accidents caused by human judgment errors can be reduced, and the overall running reliability of the direct current system is improved;
3. Through the risk assessment of the running mode of the direct current system, unpredictable faults can be effectively prevented, such as: the connection state of the inside of the storage battery and the direct current bus is monitored, the situation that the storage battery is separated from the bus unpredictably is prevented, and accident potential caused by the situation is reduced. And the following steps: the connection state between the charger and the storage battery pack is monitored, the phenomenon of overdischarge of the storage battery pack is prevented, and accident potential caused by the phenomenon is reduced;
4. the active judgment can be carried out by starting the uniform charging mode, so that the judgment accuracy is improved.
5. The problems found by the analysis can be timely prompted or reminded to find and process.
Through an intelligent and automatic monitoring method, multiple judgment method cross validation is implemented on a plurality of isolating switches in a direct current system, and combined analysis and judgment are carried out, so that whether the isolating switches are actually opened or closed or not can be automatically, quickly and effectively monitored and judged, and the situation that the isolating switches are opened or closed in place is avoided. Meanwhile, according to the logic relation of each isolating switch in the operation process of changing the operation mode of the direct current system, an operator is prompted, the fault and leakage condition caused by human errors is reduced, so that the hidden trouble of the battery pack in the process of emptying or voltage loss of the direct current bus is prevented, operation guidance is provided for changing the operation mode of the direct current system, and the safety and reliability of the operation of the direct current system are improved.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for monitoring the operation mode and the state of an isolating switch of a direct current system, which is characterized by comprising the following steps:
s1: the running state monitoring device of the direct current system is characterized by calculating the voltage difference of voltages at two sides of a bus tie isolation switch 5ZK, a first charger direct current bus side isolation switch 1ZK, a second charger direct current bus side isolation switch 2ZK, a first storage battery isolation switch 3ZK and a second storage battery isolation switch 4ZK, measuring the position signals of the bus tie isolation switch 5ZK, the first charger direct current bus side isolation switch 1ZK, the second charger direct current bus side isolation switch 2ZK, the first storage battery isolation switch 3ZK, the current passed by the second storage battery isolation switch 4ZK and an identification isolation switch auxiliary contact;
S2: the running state monitoring device of the direct current system determines that the bus tie isolating switch 5ZK, the first charging machine direct current bus side isolating switch 1ZK, the second charging machine direct current bus side isolating switch 2ZK, the first storage battery isolating switch 3ZK and the second storage battery isolating switch 4ZK are correctly opened and closed according to the voltage difference, the current and the position signal combined with a preset switch position auxiliary contact judging method or a preset isolating switch loop current judging method or a preset isolating switch two-side voltage difference judging method or a preset combination analysis judging method.
2. The method for monitoring the operation mode and the state of a disconnecting switch of a direct current system according to claim 1, wherein the step S1 is preceded by:
determining the normal operation of a direct current system;
the first section bus and the second section bus adopt a split operation state when the direct current system normally operates, at this time, the bus contact isolating switch 5ZK is in an open state, the first charger is used for throwing the direct current bus side isolating switch 1ZK, the second charger is used for throwing the direct current bus side isolating switch 2ZK, the first storage battery isolating switch 3ZK and the second storage battery isolating switch 4ZK are all in a closed state, and the direct current system is in a floating charging mode in the normal operation state.
3. The method for monitoring the operation mode and the disconnecting switch state of the direct current system according to claim 2, wherein when the direct current system meets a charging condition, the first charger and the second charger enter a charging mode, and the first charger and the second charger charge the first storage battery and the second storage battery respectively.
4. The method for monitoring the running mode and the state of the isolating switch of the direct current system according to claim 3, wherein when the direct current system meets the homogeneous charge condition, the direct current system monitoring device starts the homogeneous charge at regular time, and the direct current system running state monitoring device is controlled to start the homogeneous charge manually, and sends a starting homogeneous charge command to the direct current system monitoring device to start the homogeneous charge;
the starting and charging means that the direct current system monitoring device sends a starting and charging command to the microcomputer control device of the charger to start and charging through the communication interface.
5. The method for monitoring the operation mode of a direct current system and the state of a disconnecting switch according to claim 4, further comprising presetting the operation mode of the direct current system;
the operation mode of the preset direct current system comprises the following steps:
when the first storage battery connected with the section of bus needs the storage battery nuclear capacity, the first charger loop breaks down and needs equipment maintenance, the first storage battery pack or the first charger loop needs to be separated from the system to work, the bus connecting isolating switch 5ZK is firstly closed to realize the parallel operation state of the section of bus and the two sections of bus, after the bus connecting isolating switch 5ZK is confirmed to be completely closed, the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are opened, at the moment, the second charger direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK are positioned in the closed state, and the equipment maintenance or the storage battery nuclear capacity work can be carried out after the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are confirmed to be completely opened;
When the maintenance or the recovery process after the storage battery nuclear capacity work is completed is to firstly switch on the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK, and after the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK are confirmed to be completely closed, the bus contact isolating switch 5ZK is disconnected, and after the bus contact isolating switch 5ZK is confirmed to be completely disconnected, the direct current system is recovered to a normal running state;
when the second storage battery connected with the two-section bus needs a storage battery nuclear capacity, a second charger loop breaks down and needs equipment maintenance, and the second storage battery pack or the second charger loop needs to be separated from the system to work, the bus connecting isolating switch 5ZK is firstly closed to realize a direct current bus parallel operation state, after the bus connecting isolating switch 5ZK is confirmed to be completely closed, the second charger direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK are disconnected, at the moment, the first charger direct current bus side isolating switch 1ZK and the first storage battery isolating switch 3ZK isolating switch are positioned in a closed state, and equipment maintenance or storage battery nuclear capacity work can be carried out after the second charger direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK are confirmed to be completely opened;
When the equipment overhaul or the recovery process after the storage battery nuclear capacity work is completed, the second charger is firstly closed to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK, and after the second charger is confirmed to throw the direct current bus side isolating switch 2ZK and the second storage battery isolating switch 4ZK to be closed completely, the bus contact isolating switch 5ZK is disconnected, and after the bus contact isolating switch 5ZK is confirmed to be completely disconnected, the direct current system is recovered to a normal running state.
6. The method of claim 5, wherein an alarm signal is sent when the preset dc system mode and the operation process are violated or the on and off states of the disconnector do not satisfy the predetermined positions in the preset dc system mode.
7. A dc system, comprising:
a first section bus and a second section bus;
the first section of bus is connected with the first charger through a first charger loop, and the first section of bus is connected with the first storage battery through a first storage battery loop;
the second-section bus is connected with a second charger through a second charger loop, and is connected with a second storage battery through a second storage battery loop;
The first section of bus and the second section of bus are connected through a bus tie isolating switch 5 ZK;
the first charger loop is provided with a first charger direct current bus side isolating switch 1ZK;
the first storage battery loop is provided with a first storage battery isolating switch 3ZK;
the second charger loop is provided with a second charger direct current bus side isolating switch 2ZK;
the second battery circuit is provided with a second battery isolating switch 4ZK.
8. The direct current system according to claim 7, wherein the direct current system is provided with a direct current system monitoring device 1;
the DC system is provided with a DC system running state monitoring device 1;
the first charger is provided with a microcomputer control device 1 sleeve of the charger;
the second charger is provided with a microcomputer control device 1 sleeve of the charger.
9. The direct current system according to claim 8, wherein the direct current system monitoring device is connected with the first charger microcomputer control device through the communication interface 1, the second charger microcomputer control device through the communication interface 2, and the direct current system operation state monitoring device through the communication interface 3.
10. The direct current system according to claim 9, wherein the first charger direct current bus side disconnecting switch 1ZK has 2 main loop contacts, and is configured with one of the auxiliary contacts of the first charger direct current bus side disconnecting switch 1ZK for separating and combining the auxiliary contacts, and is connected to a direct current system running state monitoring device;
The second charging machine direct current bus side isolating switch 2ZK is provided with 2 main loop contacts, and is provided with one auxiliary contact for separating and combining the position of the second charging machine direct current bus side isolating switch 2ZK, and is connected to a direct current system running state monitoring device;
the first storage battery isolating switch 3ZK is provided with 2 main loop contacts, is provided with one auxiliary contact for separating and combining the position of the first storage battery isolating switch 3ZK, and is connected to a direct current system running state monitoring device;
the second storage battery isolating switch 4ZK is provided with 2 main loop contacts, is provided with one auxiliary contact for separating and combining the position of the second storage battery isolating switch 4ZK, and is connected to a direct current system running state monitoring device;
the bus tie isolating switch 5ZK is provided with 2 main loop contacts, and is provided with one auxiliary contact for the position of the bus tie isolating switch 5ZK and one auxiliary contact for the position of the bus tie isolating switch 5ZK, and is connected to a direct current system running state monitoring device.
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| CN107918430B (en) * | 2017-12-07 | 2023-07-25 | 中国南方电网有限责任公司超高压输电公司曲靖局 | Direct-current control protection device for realizing on-line maintenance of switching value loop |
| CN108387800B (en) * | 2018-03-13 | 2020-04-10 | 深圳市安特智能控制有限公司 | Multi-dimensional judgment method for main loop state of storage battery pack |
| CN109193879B (en) * | 2018-11-14 | 2024-03-26 | 中国工程物理研究院流体物理研究所 | Method and device for charging large-scale linear transformer driving source with fault |
| CN110531144A (en) * | 2019-08-12 | 2019-12-03 | 珠海瓦特电力设备有限公司 | A kind of grid switching operation guide device and method |
| CN110398668A (en) * | 2019-09-11 | 2019-11-01 | 广东电网有限责任公司 | A kind of looped network of DC power on-line monitoring system and method |
| CN110398667A (en) * | 2019-09-11 | 2019-11-01 | 广东电网有限责任公司 | A kind of looped network of DC power on-line monitoring system and method |
| CN110794293A (en) * | 2019-09-23 | 2020-02-14 | 国网辽宁省电力有限公司丹东供电公司 | Method for detecting automatic nuclear capacity switch state of storage battery |
| CN111917185B (en) * | 2020-07-27 | 2023-08-01 | 广东电网有限责任公司 | Switch operation monitoring system of direct current system of transformer substation |
| CN112332399B (en) * | 2020-10-23 | 2021-08-10 | 国网湖北省电力有限公司宜昌供电公司 | 220V two-electricity two-charge multi-feed direct current system |
| CN113890001B (en) * | 2021-09-29 | 2023-11-10 | 国网湖北省电力有限公司宜昌供电公司 | One-key operation method of electric operation type two-electricity two-charging direct current system |
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