CN104009652A - Portable direct-current power supply - Google Patents
Portable direct-current power supply Download PDFInfo
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- CN104009652A CN104009652A CN201410272392.7A CN201410272392A CN104009652A CN 104009652 A CN104009652 A CN 104009652A CN 201410272392 A CN201410272392 A CN 201410272392A CN 104009652 A CN104009652 A CN 104009652A
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Abstract
The invention provides a portable direct-current power supply which is used for temporary standby application and used for a test. The portable direct-current power supply comprises a lightning protection device, an alternating-current distribution unit, a charging module, a voltage reduction unit, a control circuit and a centralized monitoring and insulating monitoring unit. The portable direct-current power supply is suitable for medium and small power plants, hydroelectric power stations and all types of transformer substations in electric systems and is suitable for other users, such as petrochemical enterprises, mines and railways, utilizing direct-current devices. The portable direct-current power supply can provide an experiment direct-current power supply, can temporarily replace an existing direct-current power supply, is suitable for serving as a standby direct-current power supply for relay protection and fault illumination for instruments, meters, and the like in a secondary circuit. In order to meet the requirement of on-site running, the portable direct-current power supply can not only serve as a direct-current power supply but also monitor overvoltage or voltage shortage of a bus, and can be connected with a local monitoring system through a 485 remote communication interface so that the portable direct-current power supply can be monitored remotely and on site.
Description
Technical field
The present invention relates to a kind of DC power supply; relate in particular to a kind of Portable DC mains of interim for subsequent use and test use; be applicable to the middle-size and small-size power plant of electric power system, hydroelectric station, all kinds of transformer station; user with other use DC equipment; as petrochemical industry, mine, railway etc., experiment DC power supply can be provided, also can substitute original DC power supply temporarily; be applicable to the occasion DC power supply for subsequent use such as instrument, instrument, relaying protection and fault illumination in secondary circuit, belong to relaying protection field.
Background technology
DC power supply is widely used in as change, power distribution station, power plant, is generally to charge to DC charging motor by alternating current 220V, and DC charging motor, for DC bus, ensures the workload demand on DC bus in the short time.The control of automation equipment exchanges the DC power supply of the power devices such as uninterruption power source.
In prior art, in the time that the DC power supply in 66 kilovolts and following transformer station breaks down, can not provide in time DC power supply, will cause the equipment cannot stable operation, cause economic loss; In addition, it is loaded down with trivial details that prior art connects power operation in the time of equipment test, and efficiency is low.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, a kind of Portable DC mains of interim for subsequent use and test use is provided, the equipment that solved in prior art in the time of D. C. power source breakdown in transformer station cannot stable operation, meanwhile, in the time of equipment test, can provide temporary source.
Technical scheme of the present invention is as follows:
Lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop are connected successively; Lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop are all connected with centralized monitor and insulating monitoring unit; Centralized monitor and insulating monitoring unit connect remote interface; Exchange input and offer charging module through lightning protection device, Alternating Current Unit; The direct current of charging module stable output, pressure unit provides controls output, for load provides normal odd-job electric current; Collection, the control and management of the operational factor to lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop, the insulation against ground situation of the each branch road of on-line monitoring are realized in centralized monitor and insulating monitoring unit; And accept background monitoring by remote interface.
Described Alternating Current Unit is realized the sampling of AC-input voltage, the sampled signal of output AC voltage.
Described Alternating Current Unit after alternating voltage sampling, with arrange exchange overvoltage reference voltage, AC undervoltage reference voltage compares, and produces corresponding logic control signal, control A.C. contactor and carry out and switch and protection action; Described A.C. contactor drives as high pressure adhesive, low voltage sustain mode.
Described charging module is, EMI filter circuit, full bridge rectifier, LC filter circuit I, full-bridge phase shifting circuit, high frequency transformer, high-frequency rectification circuit, LC filter circuit II connect successively, pulse-width modulation circuit connects the output of EMI filter circuit and LC filter circuit II, and the output of pulse-width modulation circuit connects full-bridge phase shifting circuit; After three-phase alternating current input, first through EMI filter circuit, becoming high voltage direct current through full bridge rectifier, LC filter circuit I rectifying and wave-filtering again, is pulse voltage wave through the inversion of full-bridge phase shifting circuit, rectification, exports the direct current of 220V after LC filter circuit II filtering.
Described charging module is realized AC/DC conversion; Charging module has automatic/hand control function, and under automatic operation mode, charging module receives the instruction of centralized monitor and insulating monitoring unit; Under manual mode, regulated the output voltage of charging module by the potentiometer on charging module panel; Output voltage adjusting range between output voltage lower limit and the upper limit, 198V 99V-286V 143V; Described charging module adopts stepless current limliting, and, in output current rated range, current limliting is in arbitrfary point, and resolution is 1%; Each charging module in described charging module has an address, and address realm is 16-31; Described charging module adopts soft switch, and switching frequency is constant; Described charging module adopts low poor autonomous equalizing current.
The panel of described charging module be provided with power supply indicator, protection indicator light, malfunction indicator lamp and voltage electric current display gauge head.
Described pressure unit adopts step-down silicon stack, and step-down silicon stack is to be formed by silicon rectifier diode serial connection, utilizes the substantially invariable forward voltage drop of PN junction as adjusting voltage, and the silicone tube quantity that seals in circuit by change obtains pressure drop; Step-down silicon stack is divided into 4 joints and is in series, and at every joint silicon stack two ends, the normally closed electric shock of relay is carried out in pressure regulation in parallel.
In described centralized monitor and insulating monitoring unit, insulating monitoring module is used for monitoring direct current system voltage and insulation situation thereof, issues out audible and visual alarm, and corresponding warning information is sent to centralized monitor in abnormal conditions.
Described insulating monitoring module adopts insulating monitor, insulating monitor is that plain edition insulating monitor or band branch road are patrolled and examined type insulating monitor, insulating monitor is arranged on feeder cabinet, band branch road is patrolled and examined type insulating monitor and is furnished with transducer, the bottom of patrolling and examining type insulating monitor and transducer and be contained in respectively every feedback line switch with branch road, the lead-out wire of each feeder switch is through the centre bore of transducer.
Advantageous effect of the present invention is as follows;
The invention provides Portable spare DC power supply.Comprise charging module, voltage-regulation, current limliting, information instruction, insulating monitoring unit, monitoring unit, Alternating Current Unit, protection and warning function, fault and warning function; while being applicable to 66kV and following transforming plant DC power failure, provide in time DC power supply to ensure that equipment stable operation, direct current cabinet provide temporary source while replacing.This device is also provided with voltage reduction module, step-down silicon stack is to be formed by many high-power silicon rectifier diode serial connections, utilize the substantially invariable forward voltage drop of PN junction as adjusting voltage, the silicone tube quantity that seals in circuit by change obtains suitable pressure drop, reaches the object of voltage-regulation.When maintenance bypass switch, in the time that silicon stack pressure unit is safeguarded replacing, provide a bypass channel loop for controlling DC bus, ensure to control the continuous uninterrupted power supply of DC bus.The present invention has finally expanded the function of relaying protection stand-by power supply.
Ensureing, in the time of D. C. power source breakdown in transformer station, can provide DC power supply in time, ensures equipment stable operation, meanwhile, in replacing direct current cabinet, can provide temporary source.
Portable DC mains volume of the present invention is little, lightweight, easy to carry; good performance indexes, easy to adjust etc.; be suitable for the verification of transformer station, power plant's relay protection device; provide relay protection whole group of verification power supply, can busy relay operating point voltage and the ruuning situation of out-off voltage and different operating electricity screwdown device.For the debugging power supply of newly-built transformer station, power plant's relay protection device, not dependent station direct current system project progress impact of the debugging of relay protection device, thus ensure grid stability and fail safe.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, the accompanying drawing of this description is only some embodiments of the present invention.
Fig. 1 is the disclosed structural principle schematic block diagram of the embodiment of the present invention.
Fig. 2 is the disclosed centralized monitor of the embodiment of the present invention and insulating monitoring unit schematic block diagram.
Fig. 3 is the disclosed charging module schematic block diagram of the embodiment of the present invention.
Fig. 4 is the disclosed bus overvoltage/undervoltage of embodiment of the present invention logic schematic block diagram.
Fig. 5 is the disclosed control of the embodiment of the present invention or closing circuit fault logic schematic block diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, described embodiment is only the present invention's part embodiment, instead of all.
As shown in Figure 1, lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop are connected successively; Lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop are all connected with centralized monitor and insulating monitoring unit; Centralized monitor and insulating monitoring unit connect remote interface; Exchange input and offer charging module through lightning protection device, Alternating Current Unit; The direct current of charging module stable output, pressure unit provides controls output, for load provides normal odd-job electric current; Collection, the control and management of the operational factor to lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop, the insulation against ground situation of the each branch road of on-line monitoring are realized in centralized monitor and insulating monitoring unit; And accept background monitoring by remote interface.
The major function of charging module is to realize AC/DC conversion, in addition, also has the functions such as system control, alarm; Charging module has automatic/hand control function, and under automatic operation mode, charging module receives the instruction from centralized monitor and insulating monitoring unit.Under normal circumstances, all combined floodgate modules should work under auto state, to realize the intelligent management of centralized monitor and insulating monitoring unit.Under manual mode, regulated the output voltage of charging module by the potentiometer on charging module panel.
Charging module is accepted the instruction of centralized monitor and insulating monitoring unit, and regulation output voltage is to set point.Voltage adjusting range can be between output voltage lower limit (be generally 198V 99V) and the upper limit (be generally 86V 143V).
The maximum output current of charging module is limited in certain scope, to control charging current, prevents current charge.Charging module adopts stepless current limiting technique, in output current rated range, can current limliting in arbitrfary point, resolution is 1%;
In order to make centralized monitor and insulating monitoring unit can identify each charging module, each charging module is provided with an address, and address realm is 16-31.
The panel of charging module be provided with power supply indicator, protection indicator light, malfunction indicator lamp and voltage electric current display gauge head.Whether power supply indicator instruction charging module internal work power supply is normal; Protection indicator light instruction charging module is in guard mode, comprise exchange inputted/under-voltage, input phase failure, exports under-voltage etc.; Malfunction indicator lamp refers to that charging module stops output for some reason, and after failure factor eliminates, charging module still can not be replied work, as output overvoltage etc.; Voltage the voltage and current of electric current display gauge head instruction charging module output, have diverter switch to switch demonstration.
Charging module main performance is, adopts soft switch technique, and because voltage transformation rate (dv/dt) or current changing rate (di/dt) reduce much relatively, the electric stress bearing during power switch is less, and reliability is improved; In addition, due to reducing of dv/dt or di/dt, the electromagnetic interference that high frequency switch power produces also has greatly improved.
Charging module adopts the soft switch advanced technology of FBZVS-PWM, and switching frequency is constant, is easy to control, and complete machine full load efficiency approaches 95%, passes to disturb to meet European standard EN55011.
Charging module is provided with COM module; COM module completes the function of access supervisory control system, and two RS-485 mouths are provided simultaneously, and transmission protocol is that CDT stipulations are selected for user.
Charging module adopts advanced low poor autonomous equalizing current technology, and the output current of sample separately by same amplification coefficient in the current-sharing unit of each module, sets up sampled voltage, and each sampled voltage is by comparing, the reference voltage U on using maximum as current-sharing bus
bUS; The module that reference voltage is corresponding becomes " primary module " automatically, and its output current is relatively maximum, and all the other modules become " from module " automatically; Reference voltage enters into each module current-sharing unit by current-sharing bus, carries out error ratio amplify rear control module switching pulse width with its sampled voltage, finely tunes the output voltage of each module and allows output current reach unanimity; Current-sharing adjustment reaches after balance, and the output current of " from module " is all close to the output current of " primary module ", and intermodule output current difference goes to zero.
Pressure unit adopts step-down silicon stack, step-down silicon stack is to be formed by many high-power silicon rectifier diode serial connections, utilize the substantially invariable forward voltage drop of PN junction as adjusting voltage, the silicone tube quantity that seals in circuit by change obtains suitable pressure drop, reaches the object of voltage-regulation.Than other voltage-regulation mode, adopt silicon stack pressure regulation to there is anti-current impact number, safe and reliable advantage; Step-down silicon stack is divided into 4 joints (AS1-AS4) and is in series, at every joint silicon stack two ends, the normally closed electric shock of relay (K1-K4) is carried out in pressure regulation in parallel, carries out the actuating of relay if drive, and makes it get an electric shock and disconnects, make this joint silicon stack be passed into circuit, the pressure drop of pressure unit increases; Otherwise, returning if carry out relay, it gets an electric shock closed, and the silicon stack quantity that makes to seal in circuit reduces, and the pressure drop of pressure unit reduces.
When maintenance bypass switch, in the time that silicon stack pressure unit is safeguarded replacing, provide a bypass channel loop for controlling DC bus, ensure to control the continuous uninterrupted power supply of DC bus.
In described centralized monitor and insulating monitoring unit, insulating monitoring module is used for monitoring direct current system voltage and insulation situation thereof, issue out audible and visual alarm in abnormal conditions such as direct voltage over voltage or the reductions of direct current system dielectric strength, and corresponding warning information is sent to centralized monitor.
According to user's different needs, the configurable plain edition of insulating monitor or band branch road are patrolled and examined type, are generally arranged on feeder cabinet, are furnished with transducer with the monitor of branch road inspection, be contained in respectively the rear lower of every feedback line switch, the lead-out wire of each feeder switch is through the centre bore of transducer.
Built-in insulation monitor monitoring DC bus-bar voltage, positive and negative busbar voltage to earth, positive and negative busbar resistance to earth; When overtension, too low or insulation resistance send corresponding alarm signal when too low, alarm definite value can arrange by keyboard.
The interchange input of power-supply system is provided with Alternating Current Unit, and in the time occurring exchanging dead electricity, open-phase fault, by sending centralized monitor without source contact by alarm signal, centralized monitor sends AC power failure alarm signal; In the time that system is furnished with intelligent AC voltage, ammeter, these table meters can directly show AC-input voltage, electric current, and send centralized monitor by universal serial bus by the data that measure, centralized monitor can show these data, and judge to exchange and input whether overvoltage, under-voltage, dead electricity, phase shortage or three-phase imbalance, when fault, send AC power failure alarm signal; Power-supply system is provided with busbar voltage, ammeter or transmitter under normal circumstances, these table meters can directly show busbar voltage, electric current, and send centralized monitor by universal serial bus by the data that measure, centralized monitor can show these data, judge whether overvoltage, under-voltage of bus, when fault, send alarm signal; The fuse in important loop (charger) is provided with fuse fault annex, and fault-signal directly send centralized monitor, sends fuse fault alarm signal when fault; When feeder assembly be provided with feeder line dropout fault warning get an electric shock time, the fault alarm signal of respectively threading off and connect after send centralized monitor, when fault, send feeder line dropout fault alarm signal; In the time that power-supply system is furnished with feeder line state detection module, feeder line state detection module send centralized monitor by universal serial bus by the feeder switch measuring a deciliter state; The state of the output switch of charger and bus connection switch, discharge switch can be given centralized monitor by its auxiliary contact, shows and give backstage in historical record; Voltage monitor, independently voltage monitor can be matched in important loop, in the time of electric voltage exception, can send alarm signal by idle contact; In the time that power-supply system is selected the built-in ground connection instrument of watch-dog, can monitor the insulation against ground resistance of two ends bus simultaneously, and show grounding resistance, in the time that the grounding resistance monitoring is less than set point, send earth fault alarm signal; In the time that power-supply system is selected the ground connection instrument detecting with branch road, ground connection instrument send centralized monitor by RS485 Interface for digital communication by the data that measure, and sends earth fault alarm signal and show ground connection branch road number and grounding resistance when fault; In the time that power-supply system is selected the supervisory relay of insulation, can monitor that group of insulation against ground ground of one section of bus, and show earth current, in the time that earth current is greater than set point, send alarm signal.
Charging module is accepted the monitoring of centralized monitor by universal serial bus, transmit operating state and operational data in real time to centralized monitor, and accepts the control of centralized monitor; The function of centralized monitor monitoring has: the machine open/close of remote control charging module and all/float; The output voltage of remote measurement charging module and electric current; The running status of remote signalling charging module; The output voltage of remote regulating charging module.
Alternating Current Unit is mainly realized the sampling of AC-input voltage, the sampled signal of output AC voltage; Exchanging automatic switchover can be according to sampled voltage, exchanges overvoltage protection, under-voltage protection.Its concrete condition is as follows: after alternating voltage sampling, with arrange exchange overvoltage reference voltage, AC undervoltage reference voltage compares, and produces corresponding logic control signal, control A.C. contactor and carry out and switch and protection action; A.C. contactor drives as high pressure adhesive, low voltage sustain mode, and because A.C. contactor need to power up adhesive for a long time, its coil certainly will produce certain heat, and the long-term accumulation of this heat has reduced the life-span of contactor.A.C. contactor adopts high pressure adhesive to ensure the reliable adhesive of contactor, after the reliable adhesive of A.C. contactor, exchanges control box and exports specified low-voltage dc signal, maintains the adhesive of A.C. contactor.Effectively extend the useful life and the reliability that has improved contactor of contactor.
Shown in Fig. 2, of ac acquisition module: change module be responsible for to input AC power gather, filtering.And by RS485 interface, data after treatment are sent into monitoring unit and show.
Analogue collection module: the responsible analog quantity to input of this module gathers, filtering.And by RS485 interface, data after treatment are sent into monitoring unit and show.
Insulating monitoring module: this module is used for monitoring positive and negative busbar grounding situation, can send positive and negative busbar grounding resistance value into monitoring unit by RS485 interface and show and produce as required corresponding alarm signal.
Centralized monitor: centralized monitor is the core of control system, and the operation of each module in system is all undertaken by this module; Service data and the various parameter of each module are also by this module transmission simultaneously; This module can also arrange, revise system required various parameters in service, and some modules are directly manually controlled.
Shown in Fig. 3, charging module adopts full-bridge phase-shift soft switch technology.Its operation principle is: the driving pulse of four master power switch pipes is the fixed frequency pulse of duty ratio constant (D=50%).The phase place of the driving pulse of one of them brachium pontis power switch pipe immobilizes, and the phase place of the driving pulse of another brachium pontis power switch pipe is adjustable.By regulating the phase place of driving pulse of this brachium pontis power switch pipe, regulate diagonal angle brachium pontis power switch pipe ON time simultaneously within this cycle, regulate VD.At diagonal angle brachium pontis power switch pipe, within this cycle when simultaneously conducting, full-bridge inverting part is to rear one-level power output; In all the other times within this cycle, because upper brachium pontis or lower brachium pontis power switch pipe be in while conducting state, resonant inductance need to discharge energy storage simultaneously, and produces resonance with resonant capacitance.So there is circulation in full bridge inverter inside, this circulation has been created the no-voltage of power switch pipe and has been opened condition.Thereby the no-voltage that has realized power switch pipe is open-minded.Thereby voltage, current stress and the loss of power switch pipe are greatly reduced.Greatly reduce the EMI noise that power switch pipe produces under on off state.And then reliability, useful life and the efficiency of complete machine are improved.
Charging module: EMI filter circuit, full bridge rectifier, LC filter circuit I, full-bridge phase shifting circuit, high frequency transformer, high-frequency rectification circuit, LC filter circuit II connect successively, pulse-width modulation circuit connects the output of EMI filter circuit and LC filter circuit II, and the output of pulse-width modulation circuit connects full-bridge phase shifting circuit; After three-phase alternating current input, first through EMI filter circuit, becoming high voltage direct current through full bridge rectifier, LC filter circuit I rectifying and wave-filtering again, is the pulse voltage wave of 140kHz left and right through the inversion of full-bridge phase shifting circuit, rectification, exports the direct current of 220V after LC filter circuit II filtering.
Fig. 4 is bus overvoltage/undervoltage logic diagram, comprises the following steps.
Step 401: measure whether overvoltage of busbar voltage, if enter step 402, if not enter step 403;
Step 403: whether measurement result is correct, if enter step 404, if not enter step 405;
Step 405: whether high pressure sampling plate input signal is correct, if enter step 404, if not enter step 406;
Step 404: whether monitoring module mistake/owe alarm point is reasonable, if enter step 407, if not enter step 408.
Fig. 5, for controlling or closing circuit fault logic figure, comprises the following steps.
Step 501: whether air switch trips, if enter step 502, if not enter step 503;
Step 503: whether high pressure sampling plate input signal is normal, if enter step 504, if not enter step 505;
Step 504: whether switch alarm point damages, if enter step 506, if not enter step 507.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.Be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can without departing from the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will accord with principle disclosed herein and the consistent scope of features of novelty.
Claims (9)
1. Portable DC mains, is characterized in that lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop are connected successively; Lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop are all connected with centralized monitor and insulating monitoring unit; Centralized monitor and insulating monitoring unit connect remote interface; Exchange input and offer charging module through lightning protection device, Alternating Current Unit; The direct current of charging module stable output, pressure unit provides controls output, for load provides normal odd-job electric current; Collection, the control and management of the operational factor to lightning protection device, Alternating Current Unit, charging module, pressure unit and control loop, the insulation against ground situation of the each branch road of on-line monitoring are realized in centralized monitor and insulating monitoring unit; And accept background monitoring by remote interface.
2. Portable DC mains according to claim 1, the Alternating Current Unit described in it is characterized in that is realized the sampling of AC-input voltage, the sampled signal of output AC voltage.
3. Portable DC mains according to claim 1, it is characterized in that described Alternating Current Unit is after alternating voltage sampling, with arrange exchange overvoltage reference voltage, AC undervoltage reference voltage compares, produce corresponding logic control signal, control A.C. contactor and carry out switching and protection action; Described A.C. contactor drives as high pressure adhesive, low voltage sustain mode.
4. Portable DC mains according to claim 1, it is characterized in that described charging module is, EMI filter circuit, full bridge rectifier, LC filter circuit I, full-bridge phase shifting circuit, high frequency transformer, high-frequency rectification circuit, LC filter circuit II connect successively, pulse-width modulation circuit connects the output of EMI filter circuit and LC filter circuit II, and the output of pulse-width modulation circuit connects full-bridge phase shifting circuit; After three-phase alternating current input, first through EMI filter circuit, becoming high voltage direct current through full bridge rectifier, LC filter circuit I rectifying and wave-filtering again, is pulse voltage wave through the inversion of full-bridge phase shifting circuit, rectification, exports the direct current of 220V after LC filter circuit II filtering.
5. Portable DC mains according to claim 1, the charging module described in it is characterized in that is realized AC/DC conversion; Charging module has automatic/hand control function, and under automatic operation mode, charging module receives the instruction of centralized monitor and insulating monitoring unit; Under manual mode, regulated the output voltage of charging module by the potentiometer on charging module panel; Output voltage adjusting range between output voltage lower limit and the upper limit, 198V 99V-286V 143V; Described charging module adopts stepless current limliting, and, in output current rated range, current limliting is in arbitrfary point, and resolution is 1%; Each charging module in described charging module has an address, and address realm is 16-31; Described charging module adopts soft switch, and switching frequency is constant; Described charging module adopts low poor autonomous equalizing current.
6. Portable DC mains according to claim 1, the panel that it is characterized in that described charging module be provided with power supply indicator, protection indicator light, malfunction indicator lamp and voltage electric current display gauge head.
7. Portable DC mains according to claim 1, it is characterized in that described pressure unit adopts step-down silicon stack, step-down silicon stack is to be formed by silicon rectifier diode serial connection, utilize the substantially invariable forward voltage drop of PN junction as adjusting voltage, the silicone tube quantity that seals in circuit by change obtains pressure drop; Step-down silicon stack is divided into 4 joints and is in series, and at every joint silicon stack two ends, the normally closed electric shock of relay is carried out in pressure regulation in parallel.
8. Portable DC mains according to claim 1, it is characterized in that in described centralized monitor and insulating monitoring unit, insulating monitoring module is used for monitoring direct current system voltage and insulation situation thereof, issues out audible and visual alarm, and corresponding warning information is sent to centralized monitor in abnormal conditions.
9. Portable DC mains according to claim 8, it is characterized in that described insulating monitoring module adopts insulating monitor, insulating monitor is that plain edition insulating monitor or band branch road are patrolled and examined type insulating monitor, insulating monitor is arranged on feeder cabinet, band branch road is patrolled and examined type insulating monitor and is furnished with transducer, the bottom of patrolling and examining type insulating monitor and transducer and be contained in respectively every feedback line switch with branch road, the lead-out wire of each feeder switch is through the centre bore of transducer.
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| CN109599938A (en) * | 2018-11-08 | 2019-04-09 | 国网四川省电力公司成都供电公司 | A kind of direct current cabinet battery group management and maintenance system |
| CN112971972A (en) * | 2021-02-09 | 2021-06-18 | 杭州堃博生物科技有限公司 | Injection pump control system and control method thereof |
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