CN113572259A - Integrated direct-current power supply switching feeder - Google Patents
Integrated direct-current power supply switching feeder Download PDFInfo
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- CN113572259A CN113572259A CN202110679682.3A CN202110679682A CN113572259A CN 113572259 A CN113572259 A CN 113572259A CN 202110679682 A CN202110679682 A CN 202110679682A CN 113572259 A CN113572259 A CN 113572259A
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses an integrated direct-current power supply switching feed device which specifically comprises a direct-current insulation detection module, a voltage reduction module, an alarm module, an indication module, a current and voltage monitoring module and a feed module. Aiming at the inherent defects of a typical electromagnetic relay insulation monitoring device in the transformation process, the invention increases the warning function of alternating current entering a direct current system, is provided with a silicon chain voltage automatic voltage regulating device which can be quickly disassembled, only needs to independently replace the silicon chain voltage automatic voltage regulating device aiming at different direct current voltage grades, and can forcibly connect an isolating switch in parallel at the same time so as to ensure that a direct current bus is controlled to continuously and uninterruptedly supply power; the alarm module is arranged, so that the abnormity discovery time is effectively shortened, the defect can be eliminated in the shortest time, the potential safety hazard of equipment is eliminated, and the voltage of the direct current bus is ensured to be normal. The invention has the advantages of more convenient switching and simple operation process through integrated and integrated arrangement, and can be suitable for special working conditions such as a cable layer, the vicinity of a modified screen position and the like.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an integrated direct-current power supply switching feed device.
Background
The direct current system is the heart of the transformer substation, provides power for various functions of control, monitoring, protection and the like of the transformer substation, and is an indispensable part of the transformer substation. At present, a direct-current power supply system of a transformer substation with a voltage level of 110 kV or below is generally provided with one set, and along with the long-term operation, the performance of the direct-current power supply system is reduced, the reliability is reduced, faults occur frequently, the reliable power supply of high-voltage equipment is influenced, and the direct-current power supply system needs to be upgraded and reformed in time. However, due to the limited site space or control, insufficient cable length of the device and the like, the direct-current charging panel cannot be easily replaced and transformed, the power supply requirement of a power consumption unit is high, the total station equipment cannot meet the requirements of all power failure, and the transformation project needs to carry out load transfer, but the risk of device misoperation or even paralysis of the whole station protection and automatic device power failure exists in the transformation process, users and companies need to shorten the direct-current load transfer time, improve the transformation efficiency and ensure high-quality reliable power utilization, so that the application of the direct-current power supply switching feeding device in the transformation process is very important, and the direct-current insulation detection device monitors whether a direct-current system is normal or not in real time, and whether all indexes are perfect or not.
In recent years, on the basis of continuously summarizing accident potential, under the drive of lean management requirements of transformer equipment, direct current modification work is greatly improved, but the existing direct current power supply charging and feeding device has a simple structure, cannot cope with more complicated conditions, and a necessary direct current power supply switching device is lacked: the required device is heavy and complicated, and the work flow is complex, labor and time are wasted, and the work efficiency is low due to repeated wire disconnection; the typical electromagnetic relay insulation monitoring device has inherent defects in the transformation process and lacks the warning function of alternating current entering a direct current system; when the diode is in an open circuit or damaged, the control bus of the whole direct current system loses power, so that the safe operation of the direct current system is influenced, and when the direct current system is a single bus system, normal control bus voltage cannot be provided; when a switch trips, and systems such as a storage battery fuse wire is fused, voltage abnormity, insulation abnormity and the like are abnormal after the site is transformed or the transformation is interrupted, site transformation personnel cannot find out the abnormal conditions in time and cannot know the abnormal problems in time due to large site noise and no alarm sound.
Like chinese patent CN204793760U, published 2015, 11 months and 18 days, a dc power supply charging panel, including the cabinet body, its characterized in that: the cabinet body from the top down set gradually monitoring cabinet, rectifier cabinet, the cabinet of being qualified for the next round of competitions to be provided with lug, air vent on the cabinet body, the monitoring cashier's office in a shop be provided with sealing door, sealing door pass through connecting block and cabinet body coupling to be provided with watch-dog, hasp on sealing door, the rectifier cashier's office in a shop be provided with the rectifier block, the cabinet of being qualified for the next round of competitions on from top to bottom set gradually shunt switch, the female pilot lamp of accuse, the female switch of accuse, close female pilot lamp, close female switch. Although it is provided with monitoring cabinet and rectifier cabinet on the sales counter, can observe mains voltage's the condition through monitoring cabinet, is connected the back with the computer, and the personnel of being convenient for carry out real time monitoring to voltage, improve the stability of power, but it has simple structure, lacks alarm device, the inconvenient scheduling problem of switching.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the current direct current power supply charging and feeding device has the technical problem of inconvenient switching. An integrated DC power supply switching feeder device with convenient switching is provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the integrated direct-current power supply switching feeder device comprises a power supply module, a voltage reduction module, a current and voltage monitoring module, a direct-current insulation detection module and a feed module, wherein the voltage reduction module is used for reducing the voltage of a direct-current system with different voltage grades and the voltage of a storage battery pack to a control mother voltage, the power supply module is connected with the voltage reduction module, the voltage reduction module is respectively connected with the feed module and the direct-current insulation detection module, and the current and voltage monitoring module is respectively connected with the feed module and the direct-current insulation detection module. An integrated direct-current power supply switching feeder device realizes the functions of current and voltage monitoring, direct-current grounding monitoring, alternating-current channeling monitoring overvoltage/undervoltage monitoring and the like through a direct-current insulation detection module; the voltage of the direct current system composite bus and the storage battery pack with different voltage grades is reduced to the voltage of the control bus through the voltage reduction module; the alarm module provides background and on-site alarm information such as direct current grounding, alternating current channeling into direct current, overvoltage and undervoltage, fuse fusing and the like, and the requirement of safety of customers is met; whether the power supply of each device to be powered is successful or not is visually displayed through the indicating module so as to fulfill the aim of normal operation of the device; the current and voltage monitoring module provides the functions of monitoring the voltage of the storage battery, the current of the storage battery, the control bus voltage and the total load current; the control power supply, the device power supply and the equipment switching-on and switching-off power supply of the relay protection device are accurately output through the feed module, and the switching accuracy of the direct-current power supply is improved.
Preferably, the voltage reduction module comprises a voltage reduction silicon chain, and the voltage reduction silicon chain is connected with the power supply module. The device has a voltage reduction silicon chain which is not provided by a single direct current feed screen, so that a plurality of closing buses are provided, and a backup power storage battery or a closing air switch load can be connected. The voltage reduction silicon chain can be conveniently detached and replaced, the voltages of 110V and 220V are universal, and the adaptability of each voltage class transformer substation is strong. The voltage reduction silicon chain forced parallel isolating switch is suitable for each operation mode of a direct current system, is additionally provided with the voltage reduction silicon chain forced parallel isolating switch, and is still suitable for a single bus system.
Preferably, the voltage reduction silicon chain is provided with a corresponding silicon chain voltage automatic regulating device. The silicon chain voltage automatic voltage regulating device capable of being rapidly disassembled is arranged, and only the silicon chain voltage automatic voltage regulating device needs to be replaced independently aiming at different direct current voltage grades, and meanwhile, the isolating switch can be forced to be connected in parallel, so that continuous uninterrupted power supply of the direct current bus is guaranteed to be controlled.
Preferably, the device further comprises an alarm module, and the alarm module is connected with the direct-current insulation detection module. The direct current insulation detection module ensures the safety of the outgoing line load during the switching period, avoids the occurrence of serious consequences caused by the failure of timely finding direct current grounding, alternating current channeling and the like, and reminds workers through the alarm module when the direct current insulation detection module detects abnormality.
Preferably, the alarm module comprises a local acousto-optic alarm unit for reminding workers and a background alarm unit for remotely reminding, and the local acousto-optic alarm unit and the background alarm unit are both connected with the direct-current insulation detection module. Local acousto-optic warning and background warning functions are achieved through the local acousto-optic warning unit and the background warning unit, when any switch tripping, fuse fusing of the storage battery, voltage abnormity, insulation abnormity and the like are warned to remind maintenance and operators on duty, and safety is guaranteed by timely processing.
Preferably, the power module comprises a combined female charging unit, a controlled female charging unit and a storage battery charging unit, and the combined female charging unit, the controlled female charging unit and the storage battery charging unit are all connected with the voltage reduction module. The device is provided with a mother-closing charging interface, a mother-control charging interface, a storage battery interface and protection, and the three interfaces can provide power. Therefore, the storage battery is hard (directly) connected into the feed screen, the storage battery is not separated from the system, and the reliability is high.
Preferably, the feeding module includes a control feed-out loop unit and a switch-on feed-out loop unit, and both the control feed-out loop unit and the switch-on feed-out loop unit are connected to the voltage reduction module. The feed module is used for accurately outputting a relay protection device control power supply, a device power supply and an equipment switching-on and switching-off power supply, and the switching accuracy of the direct-current power supply is improved.
Preferably, the device further comprises an indication module for displaying power supply conditions of the devices to be powered, and the indication module is connected with the direct-current insulation detection module. The indicating module is used for visually displaying whether the power supply of each device to be powered is successful or not so as to fulfill the aim of normal operation of the device.
The substantial effects of the invention are as follows: aiming at the inherent defects of a typical electromagnetic relay insulation monitoring device in the transformation process, the invention increases the warning function of alternating current entering a direct current system, is provided with a silicon chain voltage automatic voltage regulating device which can be quickly disassembled, only needs to independently replace the silicon chain voltage automatic voltage regulating device aiming at different direct current voltage grades, and can forcibly connect an isolating switch in parallel at the same time so as to ensure that a direct current bus is controlled to continuously and uninterruptedly supply power; the alarm module is arranged, so that the abnormity discovery time is effectively shortened, the defect can be eliminated in the shortest time, the potential safety hazard of equipment is eliminated, and the voltage of the direct current bus is ensured to be normal. The invention has the advantages of more convenient switching and simple operation process through integrated and integrated arrangement, and can be suitable for special working conditions such as a cable layer, the vicinity of a modified screen position and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present embodiment;
fig. 2 is a schematic diagram of the patch feeding system of the present embodiment.
Wherein: 1. the system comprises a power supply module, 2, a voltage reduction module, 3, a current and voltage monitoring module, 4, a direct current insulation detection module, 5, a feed module, 6, an alarm module, 7, an indication module, 8, a combined mother charging unit, 9, a controlled mother charging unit, 10, a storage battery charging unit, 11, a control feed-out loop unit, 12, a switch-on feed-out loop unit, 13, a local acousto-optic alarm unit, 14, a background alarm unit, 15, a charger, 16, a storage battery pack, 17, a combined mother charging part, a controlled mother charging part, 18, a storage battery fuse, 19, current and voltage monitoring, 20, direct current insulation detection, 21, system background monitoring, 22, a control feed-out loop, 23 and a switch-on feed-out loop.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The utility model provides an integrated form DC power supply switching feeder, as shown in figure 1, including power module 1, a step-down module 2 for merging different voltage class direct current system and storage battery voltage step-down to the mother's voltage of accuse, current and voltage monitoring module 3, direct current insulation detection module 4, feed module 5, alarm module 6 and indicating module 7, power module 1 is connected with step-down module 2, step-down module 2 is connected with feed module 5 and direct current insulation detection module 4 respectively, current and voltage monitoring module 3 optional digital meter. The digital meter has the advantages of smaller reading error in the full-range, convenient measurement and display, short reading time and high working efficiency.
The power module 1 comprises a combined female charging unit 8, a controlled female charging unit 9 and a storage battery charging unit 10, and the combined female charging unit 8, the controlled female charging unit 9 and the storage battery charging unit 10 are all connected with the voltage reduction module 2. The device is provided with a mother-closing charging interface, a mother-control charging interface, a storage battery interface and protection, and the three interfaces can provide power. Therefore, the storage battery is hard (directly) connected into the feed screen, the storage battery is not separated from the system, and the reliability is high.
The voltage reduction module 2 comprises a voltage reduction silicon chain, and the voltage reduction silicon chain is connected with the power supply module 1. The device has a voltage reduction silicon chain which is not provided by a single direct current feed screen, so that a plurality of closing buses are provided, and a backup power storage battery or a closing air switch load can be connected. The voltage reduction silicon chain can be conveniently detached and replaced, the voltages of 110V and 220V are universal, and the adaptability of each voltage class transformer substation is strong. The voltage reduction silicon chain forced parallel isolating switch is suitable for each operation mode of a direct current system, is additionally provided with the voltage reduction silicon chain forced parallel isolating switch, and is still suitable for a single bus system. The voltage reduction silicon chain is provided with a corresponding silicon chain voltage automatic regulating device. The silicon chain voltage automatic voltage regulating device capable of being rapidly disassembled is arranged, and only the silicon chain voltage automatic voltage regulating device needs to be replaced independently aiming at different direct current voltage grades, and meanwhile, the isolating switch can be forced to be connected in parallel, so that continuous uninterrupted power supply of the direct current bus is guaranteed to be controlled.
The alarm module 6 is connected with the direct current insulation detection module 4. The direct-current insulation detection module 4 ensures the safety of the outgoing line load during the switching period, avoids the occurrence of serious consequences caused by the failure of timely finding direct-current grounding, alternating-current channeling and the like, and reminds workers through the alarm module 6 when the direct-current insulation detection module 4 detects abnormality. The alarm module 6 comprises a local acousto-optic alarm unit 13 for reminding workers and a background alarm unit 14 for remote reminding, and the local acousto-optic alarm unit 13 and the background alarm unit 14 are both connected with the direct-current insulation detection module 4. Local acousto-optic alarm and background alarm functions are achieved through the local acousto-optic alarm unit 13 and the background alarm unit 14, when any switch tripping, storage battery fuse fusing, voltage abnormity, insulation abnormity and other alarms occur in the transformation process, overhaul and on-duty personnel can be reminded, and the safety is ensured by timely processing.
The feeding module 5 comprises a control feed-out loop unit 11 and a closing feed-out loop unit 12, and both the control feed-out loop unit 11 and the closing feed-out loop unit 12 are connected with the voltage reduction module 2. The feed module 5 is used for accurately outputting a control power supply of the relay protection device, a device power supply and an equipment switching-on and switching-off power supply, and the switching accuracy of the direct-current power supply is improved. The feeding module 5 can be an air switch. The recovery time after the air switch is disconnected is relatively short, the working efficiency is high, and the mechanical life is relatively long.
The indicating module 7 is used for displaying the power supply condition of each device to be powered, and the indicating module 7 is connected with the direct current insulation detecting module 4. The indicating module 7 is used for visually displaying whether the power supply of each device to be powered is successful or not so as to fulfill the aim of normal operation of the device. The indicating module 7 can be an LED indicating lamp. The LED indicator lamp has relatively high insulation resistance value and small power consumption.
As shown in fig. 2, in practical application, three different power supplies are connected to a charging section, including a charger 15, a battery pack 16, and a bus and bus control charging section 17, that is, one ac line is connected to the bus charging section, the other ac line is connected to the bus control charging section, and the battery pack 16 is connected to a battery fuse 18 charging section.
Each power supply carries out voltage regulation through the voltage reduction module 2, the voltage reduction module 2 is a method adopted by a direct current power supply system for solving the problem of too large difference between the voltage of a storage battery (power switching-on bus) and the voltage of a control bus, and the voltage of the control bus (KM) is basically kept unchanged by adjusting the voltage reduction on the voltage reduction silicon regardless of the floating charge state, the balanced charge state and the discharge state of the storage battery. The voltage reduction module 2 comprises an automatic control circuit, a regulating switch, a large-current direct-current relay, a grouping voltage reduction silicon chain and the like, when the power switching-on bus voltage (HM) is continuously reduced from the maximum value, the automatic voltage regulating device always keeps the voltage on the control bus (KM) at a setting value, and when the power bus voltage gradually increases from the minimum value to the maximum value, the automatic voltage regulating device also can keep the voltage on the control bus at the setting value. And a manual adjusting function is also provided. And the voltage value of the power bus is unchanged, and the voltage of the control bus is changed once by manually regulating the voltage one gear each time until the voltage of the control bus is equal to the voltage of the power bus. Reverse voltage regulation may also be performed. The automatic and manual adjusting device has the advantages of automatic adjustment, rapid manual adjustment, stable and reliable work, light weight, convenience in installation and the like. The buck silicon chain formed by configuring the buck tube core has the advantages of good consistency of forward characteristics of PN junctions, stable buck voltage, small dynamic resistance and the like. And the power supply system can be combined at will according to the requirements of customers, so that the reliability and the superiority of the whole product are ensured, the design of the power supply system is optimized to the maximum extent, and perfect, reliable and reasonable application is achieved. In addition, in the application process, the diode is simulated to be open-circuited or damaged, and only the forced parallel isolating switch is required to be closed, so that a bypass straight-through loop is provided for controlling the direct-current bus, the continuous uninterrupted power supply of the direct-current bus is guaranteed, and the safe operation of a direct-current system is guaranteed. When some direct current systems are single bus systems in the application process, the voltage of the input end and the voltage of the output end of the voltage reduction silicon chain are the same by closing the forced parallel isolating switch, and the direct current bus is controlled to be normal.
The voltage value of the storage battery, the current value of the storage battery, the voltage value of the control bus and the total load current value in the device are monitored by a current and voltage monitoring device 19. And then the voltage is transmitted to the closing feed-out loop 23 and the control feed-out loop 22 through the external loop direct current connection and the air switch.
In actual application, when the direct current system normally operates, the positive electrode and the negative electrode are not grounded. When one point is grounded, no short-circuit current flows through the grounding point, the fuse can not be fused, the fuse can still continue to operate, and the short-circuit current can be found and eliminated in time. Otherwise, when another point is grounded, the malfunction of the control circuit and the relay protection circuit may be caused. Due to the fact that the distributed capacitance of the direct-current power supply system to the ground is greatly increased, when the capacitance of the direct-current power supply system to the ground reaches a certain order of magnitude, under the condition that certain working conditions are met, the direct-current power supply system is grounded at one point, misoperation of an outlet protection relay can be caused, and therefore serious accidents such as tripping of a main transformer of a transformer substation and the like are caused, and production is seriously influenced. In order to monitor the insulation state of the dc system, an insulation monitoring device is installed, and an operator can use the device to constantly measure the insulation resistance of the dc system to maintain the insulation resistance at 0.5M Ω or more. The device 20 can monitor the ground insulation condition of the direct current system in real time, find and early warn abnormal states such as insulation reduction or direct current grounding in time, and can avoid serious electric power system accidents. The device can carry out conventional monitoring: namely, (1) the bus voltage value is digitally displayed, and an alarm signal is output when the voltage is too high or too low. (2) The digital display is the insulation resistance value to ground of positive, negative generating line, outputs alarm signal when insulation resistance is too low. (3) Setting values with overhigh or overlow voltage and overlow insulation resistance are set by using function keys, and each setting value is digitally displayed. (4) The monitoring range is wide, and the precision is high. Branch patrols can also be performed: namely, (1) the power supply of the branch circuit does not need to be cut off during the patrol; when signal sources (7V, 15-25 Hz) are superposed, self-checking and protection measures are provided. (2) Signaling when the bus to ground insulation resistance decreases. And after the signal source is put into the circuit, automatically patrolling the impedance of each branch circuit or independently searching the impedance condition of each branch circuit. (3) And the resistance display precision can still be ensured under the condition that a large distributed capacitance exists in the system. (4) The matched small current transformers have various models, the sizes are only related to the thickness of a load cable, the electrical parameters are consistent, the wiring direction is not required, and the small current transformers can be installed at will. (5) When the bus line reduces the insulation resistance to ground, it sends signal and automatically puts in signal source to automatically inspect the impedance and capacitive reactance of each branch. (6) The staff need not the operation, need not to wait for, just can obtain trouble branch road number and corresponding insulation resistance value. (7) And the resistance display precision can still be ensured under the condition that a large distributed capacitance exists in the system.
In a transformation site, when a switch is tripped, the storage battery fuse wire 18 is fused, voltage abnormity, insulation abnormity and other systems are abnormal, site transformation personnel can not find abnormal conditions in time due to large site noise and no alarm sound, and an alarm module needs to be additionally arranged in the device aiming at the above conditions, so that the site transformation personnel can make a sound and light to remind site workers of abnormal conditions in time when the switch is tripped, and the storage battery fuse wire 18 is fused, voltage abnormity, insulation abnormity and other systems are abnormal, so that the potential safety hazard of equipment needs to be timely handled, and the voltage of a direct current bus is ensured to be normal. After the transformation interruption, when the switch trips, the storage battery fuse 18 is fused, the voltage is abnormal, the insulation is abnormal and other system abnormalities occur, even if the system abnormalities, a sound and a light alarm are given, no working personnel on site can know the abnormality in time. Aiming at the situations, an alarm signal connected into a background is required to be additionally arranged in the device, so that the alarm signal can be connected into the background through a hard contact and an RS-485 interface when the switch trips, the system such as the fuse wire 18 of the storage battery, the voltage abnormity, the insulation abnormity and the like are abnormal, and the system background monitoring 21 is convenient to remind a background monitoring person that the abnormal situation occurs, contact professional maintenance personnel to timely handle the abnormal situation, stop the potential safety hazard of equipment and ensure the normal voltage of the direct current bus.
In the embodiment, the functions of current and voltage monitoring, direct current grounding monitoring, alternating current channeling monitoring overvoltage/undervoltage monitoring and the like are realized through the direct current insulation detection module 4; the voltage of the direct current system composite bus and the storage battery pack with different voltage grades is reduced to the voltage of the control bus through the voltage reduction module 2; the alarm module 6 provides background and on-site alarm information such as direct current grounding, alternating current channeling into direct current, overvoltage and undervoltage, fuse fusing and the like, so that the requirement of safety of customers is met; whether the power supply of each device to be powered is successful or not is visually displayed through the indicating module 7 so as to fulfill the aim of normal operation of the device; the current and voltage monitoring module 3 provides the functions of monitoring the voltage of the storage battery, the current of the storage battery, the control bus voltage and the total load current; the control power supply of the relay protection device, the device power supply and the switching-on and switching-off power supply of the equipment are accurately output through the feed module 5, and the switching accuracy of the direct-current power supply is improved.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (8)
1. The utility model provides an integrated form DC power supply switching feeder, characterized in that, includes power module (1), is used for merging different voltage class DC system and storage battery voltage step-down to the female voltage of accuse step-down module (2), current voltage monitoring module (3), direct current insulation detection module (4) and feed module (5), power module (1) with step-down module (2) are connected, step-down module (2) respectively with feed module (5) with direct current insulation detection module (4) are connected, current voltage monitoring module (3) respectively with feed module (5) with direct current insulation detection module (4) are connected.
2. An integrated dc power supply transition feeder apparatus according to claim 1, wherein the voltage-reducing module (2) comprises a voltage-reducing silicon chain, and the voltage-reducing silicon chain is connected with the power supply module (1).
3. An integrated dc power supply switching feeder apparatus as claimed in claim 1 or 2, wherein the step-down silicon chain is provided with a corresponding silicon chain voltage automatic voltage regulating apparatus.
4. The integrated direct-current power supply switching feeder device according to claim 1, further comprising an alarm module (6), wherein the alarm module (6) is connected with the direct-current insulation detection module (4).
5. The integrated direct-current power supply switching feeder device according to claim 4, wherein the alarm module (6) comprises a local acousto-optic alarm unit (13) for reminding workers and a background alarm unit (14) for remote reminding, and the local acousto-optic alarm unit (13) and the background alarm unit (14) are both connected with the direct-current insulation detection module (4).
6. The integrated direct-current power supply switching feeder device according to claim 1 or 5, wherein the power module (1) comprises a combined female charging unit (8), a controlled female charging unit (9) and a storage battery charging unit (10), and the combined female charging unit (8), the controlled female charging unit (9) and the storage battery charging unit (10) are all connected with the voltage reduction module (2).
7. The integrated dc power supply transition feeding apparatus according to claim 1 or 5, wherein the feeding module (5) comprises a control feed-out loop unit (11) and a switch-on feed-out loop unit (12), and both the control feed-out loop unit (11) and the switch-on feed-out loop unit (12) are connected to the voltage reduction module (2).
8. The integrated direct-current power supply switching feeder device according to claim 6, further comprising an indication module (7) for displaying power supply conditions of each device to be powered, wherein the indication module (7) is connected with the direct-current insulation detection module (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110679682.3A CN113572259A (en) | 2021-06-18 | 2021-06-18 | Integrated direct-current power supply switching feeder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114039342A (en) * | 2021-12-03 | 2022-02-11 | 广西电网有限责任公司钦州供电局 | DC equipment inspection device in DC power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114039342A (en) * | 2021-12-03 | 2022-02-11 | 广西电网有限责任公司钦州供电局 | DC equipment inspection device in DC power supply system |
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