CN203660664U - Comprehensive distribution box integrating protection, measurement and control - Google Patents

Comprehensive distribution box integrating protection, measurement and control Download PDF

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Publication number
CN203660664U
CN203660664U CN201320723448.7U CN201320723448U CN203660664U CN 203660664 U CN203660664 U CN 203660664U CN 201320723448 U CN201320723448 U CN 201320723448U CN 203660664 U CN203660664 U CN 203660664U
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China
Prior art keywords
switch
control
module
distribution box
distribution transformer
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Expired - Fee Related
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CN201320723448.7U
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Chinese (zh)
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王成楷
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
NanAn Power Supply Co of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
NanAn Power Supply Co of State Grid Fujian Electric Power Co Ltd
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Abstract

The utility model discloses a comprehensive distribution box integrating protection, measurement and control. A distribution transformer monitoring terminal comprises an analog acquisition module, a digital signal processor, a CPU (central processing unit), a clock module, a digital memory, an I/O module and a communication module, wherein the analog acquisition module is connected with the CPU through a DSP (digital signal processor), the clock module, the digital memory and the I/O module are connected with the CPU, and the distribution transformer monitoring terminal is further provided with a control interface, a state quantity acquisition interface and a communication interface. A reactive compensation switch, an incoming line switch, a control power supply switch, a feeder switch and a reactive compensation device are connected with the distribution transformer monitoring terminal through the interfaces. The comprehensive distribution box disclosed by the utility model can support such four modes as remote measuring, remote signaling, remote regulating and remote control to carry out integrated monitoring management on a distribution transformer and a low-voltage distribution network, and automatically coordinates and regulates action modes and operation modes of various devices in the distribution box according to factors such as fault type, fault range, emergency degree and the like.

Description

Protection measurement and control integration comprehensive distribution box
Technical field
The utility model relates to a kind of comprehensive distribution box, particularly a kind of protection measurement and control integration comprehensive distribution box.
Background technology
Current, the automatization level of low pressure rural power grids is also in the starting stage, and the protection measurement and control integration application aspect of low-voltage distribution network is bordering on blank.Applying of State Grid Corporation of China " power information acquisition system ", distribution transformer monitoring terminal, intelligent electric meter are installed in power distribution station, the progressively remote monitoring of the distribute-electricity transformer district electric weight of realization, voltage, electric current, power, and realize the remote meter reading to low-voltage electricity user.According to interrelated data and report, distribute-electricity transformer district, some areas pilot has realized low-voltage reactive power automatic compensation integrated or that disperse, residual current operated protective device remote monitoring, low voltage electric network branch line monitor loop, the monitoring of distribution transforming oil temperature, although realized distribution transforming and low-voltage customer " remote measurement " and part " remote regulating ", " remote control " function, but, aspect some basic power equipments and ustomer premises access equipment protection, still lack overvoltage, under-voltage, the disconnected defencive function that equates many necessity, and there are various systemic-function juxtapositions, all kinds of measurements, protection, the problems such as control appliance function repeated application, be unfavorable for unified construction and management.
Comparatively advanced distribution transforming comprehensive distribution box has been installed distribution transformer monitoring terminal, intelligent electricity leakage protector, intelligent low-pressure circuit breaker, automatic reactive compensator concentratedly in a casing.The patent No. is the utility model patent of 201120344030.6 1 kinds of Multifunctional low voltage distribution boxes, by low voltage incoming line switch, outlet switch, intelligence distribution transformer terminals, reactive power compensation device is integrated in a casing, using breaker of plastic casing as service entrance switch, (also claim full-automatic comprehensive power distribution protective device by multichannel high breaking automatic reclosing RCD, hereinafter to be referred as protector) as outlet switch, this protector collection overload, short circuit, overvoltage, under-voltage, phase shortage, electric leakage and automatic reclosing are in one, and communicate by letter with control unit by 485 and 232 communication interfaces.The shortcoming of this patented technology scheme is: the metrical information of distribution transformer terminals cannot be directly closely associated with protection, the control function of the switches such as service entrance switch, low voltage incoming line switch cannot carry out Long-distance Control and automatically control, cannot, with each outlet switch according to the situation such as fault type, scope coordination linkage, cannot carry out intelligent fault isolation and load adjustment to whole power distribution station; In distribution box, each automatics does not have reliable and stable control power supply, causes reliability not high.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art part; and provide a kind of have several functions, can hold remote measurement, remote signalling, remote regulating, remote control " four is distant " mode distribution transformer and low-voltage network are carried out to integrated monitoring management; and can be according to factors such as fault type, fault coverage, urgency levels, the protection measurement and control integration comprehensive distribution box of all kinds of device action modes and operational mode in automatic synchronization, adjustment distribution box.
A kind of protection measurement and control integration comprehensive distribution box, includes current transformer, zero sequence current mutual inductor, reactive power compensator, control mains switch, reactive power compensation switch, service entrance switch, feeder switch, Distribution Transformer Terminal Unit, described Distribution Transformer Terminal Unit includes analogue collection module, digital signal processor, CPU processor, clock module, digital storage, I/O module, communication module, described analogue collection module is connected with CPU processor by DSP digital signal processor, clock module, digital storage, I/O module, communication module is connected with CPU processor respectively, and described Distribution Transformer Terminal Unit also has control interface, quantity of state is adopted interface and communication interface, described reactive power compensation switch, service entrance switch, control mains switch, feeder switch and reactive power compensator are connected with Distribution Transformer Terminal Unit by interface, between described protection measurement and control integration comprehensive distribution box and distribution transformer, adopt power cable to be connected, in distribution transformer inside, temperature sensor is installed, temperature sensor passes to Distribution Transformer Terminal Unit by signal cable by signal, the Distribution Transformer Terminal Unit communication connection that is also connected with long-range main website or/and terminal equipment PDA by communication module.
Protection measurement and control integration comprehensive distribution box of the present utility model; can support remote measurement, remote signalling, remote regulating, remote control " four is distant " mode to carry out integrated monitoring management to distribution transformer and low-voltage network; and according to factors such as fault type, fault coverage, urgency levels; all kinds of device action modes and operational mode in automatic synchronization, adjustment distribution box; realize the action of fault type automatic decision, selectivity and automatic reclosing function, realizing low-voltage platform area transient fault can " self-healing ", can " intelligence isolation " to permanent fault.
An electrical wiring access point of current transformer, zero sequence current mutual inductor, distribution transformer terminals, control power module is all located at the electric power incoming line side of service entrance switch.
The analogue collection module of described protection measurement and control integration comprehensive distribution box comprises three-phase voltage, electric current, leakage current, temperature Four types collection terminal, gathers respectively corresponding types analog data.
Described current transformer is made up of three electric parameters, characteristic same current instrument transformer, for gathering inlet wire cable A, B, C three-phase current signal, and the current acquisition terminal of its secondary side lead-in wire access Distribution Transformer Terminal Unit analogue collection module.
Inlet wire cable A, B, C phase line and zero line are jointly through the iron core of zero sequence current mutual inductor, and zero sequence current mutual inductor secondary side access distribution transformer terminals analogue collection module leakage current gathers terminal, realizes the collection of residual current signal.
Service entrance switch is frame-type or the plastic shell low voltage breaker with shunt release, motor-operating mechanism and auxiliary switch annex.
Reactive power compensation switch, control mains switch adopt the plastic shell low voltage breaker with shunt release and auxiliary switch annex.
Feeder switch adopts with the intelligent comprehensive earth leakage protective device of communication interface, communicates, and accept the monitoring of distribution transformer terminals by its RS485 or RS232 interface and Distribution Transformer Terminal Unit.
Described protection measurement and control integration comprehensive distribution box also includes control power module; described control power module is introduced three phase mains through controlling mains switch from distribution box point of incoming cables; after conversion, voltage stabilizing, filtering/rectification are processed; single phase alternating current (A.C.)/the DC control supply of outputting high quality; control power module outlet same service entrance switch, reactive power compensation switch, the shunt release of controlling mains switch, motor-operating mechanism and be connected, for above-mentioned three switchgears provide point, closing operation control power supply.Control power module also can be uncompensated device, feeder switch provides the operation power supply of high-quality high reliability and controls power supply.
In sum, the utility model following advantage compared to existing technology:
1, taking distribution transformer terminals as core watch-dog; realize the integrated automatic monitoring management in the aspects such as signal, measurement, protection, control, communication at distribution box; and accessible long-range main website, realize " four the is distant " function to distribution box and the remote signalling of affiliated power distribution station thereof, remote measurement, remote control, remote regulating.
2, the intelligent relay protection function in perfect power distribution station.The relay protection functions such as voltage class relaying protection (overvoltage, under-voltage, phase shortage, negative phase sequence), current capacity relaying protection (short circuit, overcurrent, leakage current are out-of-limit), DC simulation class relaying protection (temperature of oil in transformer) are integrated; the distribution box automatically type to power distribution station fault, scope, character carries out comprehensive automation judgement execution protection action; reduce fault outage scope and number of times, improve power supply reliability.
3, provide intelligent power distribution control function.Carry out the unified monitoring to distribution transformer, service entrance switch, feeder switch, reactive power compensator and other switch by distribution transformer terminals; and action matching relationship between the each switch of automatic synchronization, coordinate the matching relationship between all kinds of relaying protections, automatic reclosing, switching manipulation, and support load automatically to regulate.
4, management maintenance function easily.Introduce the on-the-spot operation maintenance equipment of PDA intelligent terminal as distribution box, be supported on PDA and realize distribution box operation feelings monitoring of working condition, parameter adjustment, operation control, increase work efficiency, reduce labour intensity.
5, increase and control power module, improve the reliable stability of the inner measuring and controlling equipment of distribution box, improve the protection and control reliability to power distribution station electrical network, equipment.
Brief description of the drawings
Fig. 1 is the secondary circuit connection diagram of the utility model protection measurement and control integration comprehensive distribution box.
Fig. 2 is the once electrical connection schematic diagram of the utility model protection measurement and control integration comprehensive distribution box.
Embodiment
Below in conjunction with embodiment, the utility model is described in more detail.
Embodiment 1
A kind of protection measurement and control integration comprehensive distribution box; in distribution box, an electric connecting relation of each parts as shown in Figure 2; current transformer TA1, zero sequence current mutual inductor TA0, distribution transformer terminals are connected to inlet wire cable side, control power module and are connected to inlet wire cable side through controlling mains switch QF3.Between inlet wire cable and 0.4kV bus, be connected in series service entrance switch QF1; Reactive power compensator is through reactive power compensation switch QF2 access 0.4kV bus; The end of incoming cables of feeder switch QF4, feeder switch QF5, feeder switch QF6 is arranged in order access 0.4kV bus, its outlet termination low pressure feeder cable.In A, the B of 0.4kV bus, C phase line, also connect respectively a lightning arrester (or Surge Protector).
Current transformer TA1, zero sequence current mutual inductor TA0, distribution transformer terminals, control the access point of power module all above service entrance switch, its advantage is: work as service entrance switch, reactive power compensation switch, feeder switch is in the time of open position, directly power or through controlling the power supply of power module by inlet wire cable, each main measurement in distribution box, protection, control appliance is normal charging operation still, distribution transformer terminals still can be implemented effective monitoring to its monitored object, and can keep normal communication state with long-range main website, guarantee distribution box remote measurement and control continuity, be conducive to long-range main website to power distribution station accident analysis and Fault Isolation.
Distribution transformer terminals is connected shunt release MX1, the motor-operating mechanism MCH1 of service entrance switch QF1 with control line by control interface, realize the breaking-closing operating to service entrance switch QF1, the auxiliary switch OF1 that connects service entrance switch QF1 by quantity of state acquisition interface, holding wire, realizes the monitoring of switch deciliter position.Distribution transformer terminals is realized the monitoring principle of reactive power compensation switch QF2, control mains switch QF3 identical with said method, automatically controls but can only carry out sub-switching operation.
Zero sequence current mutual inductor TA0, temperature sensor, distribution transformer terminals, service entrance switch QF1 and current transformer TA1 by between them once, secondary electric connecting relation; just form the comprehensive relaying protection system of microcomputer that integrates measurement, protection, control, supervision, communication several functions; the microcomputer type relay protection that can realize the parametric type such as voltage, electric current, temperature of power distribution station, comprising: protection and the monitoring of distribution transforming oil temperature such as overvoltage, under-voltage, phase shortage, negative phase sequence, short circuit, overcurrent, electric leakage.Wherein, distribution transformer terminals is the harvester of electric simulation signals collecting, conversion, digitized processing, is also the intelligent controlling device that carries out relaying protection judgement and protection control command, is also the storage of service data information, data communication equipment simultaneously; Service entrance switch QF1 and other switch are the main actuators of the comprehensive relaying protection system of microcomputer.
Feeder switch QF4, QF5, QF6 select the intelligent comprehensive earth leakage protective device with communication interface, are a kind of multifunctional electric leakage circuit breakers with defencive functions such as electric leakage, overcurrent, short circuit and electric voltage exceptions.Each feeder switch communicates by RS485 or RS232 interface and distribution transformer terminals, and accepts the unified of distribution transformer terminals and coordinate and monitoring.
Between service entrance switch and each feeder switch or reactive power compensation switch; it is the relation that the superior and the subordinate's selectivity microcomputer protective relay coordinates; also be the relation of main protection and backup protection, and divide the work to coordinate according to key elements such as protection range, relaying protection type, parameter cooperations.In distribution box, the Cooperation with Relay of each switch, automatic reclosing order, action latching relation are controlled by distribution transformer terminals is unified.For the division of labor that realizes relaying protection coordinates with classification; according to feeder line downside customer charge feature; the electric leakage of feeder switch QF4, QF5, QF6, overcurrent, short-circuit protection parameter tuning value should be less than the setting value of service entrance switch relevant parameter; simultaneously; cancel the electric voltage exception type relay protection function of feeder switch, the voltage class power-off protection functions such as overvoltage, under-voltage, phase shortage, negative phase sequence are completed by service entrance switch.
Understand and realize the utility model for ease of person of ordinary skill in the field, existing by each switch relaying protection course of action in distribution box, be once electrically connected schematic diagram with comprehensive distribution box shown in Fig. 2 and be exemplified below:
Current capacity relaying protection: in the time that overcurrent or short trouble occur low pressure feeder line 1; feeder switch QF4, distribution transformer terminals detect overcurrent or short circuit current simultaneously; according to coordination relationship of protection; the overcurrent of feeder switch QF4 or short circuit current setting value, operation time limit are all less than service entrance switch QF1; first feeder switch QF4 switch trips, and fault message and action situation are reported and submitted to distribution transformer terminals by interface.If feeder switch QF4 itself is because of fault remarkable action, unsuccessful isolated fault point, distribution transformer terminals will still collect overcurrent or short circuit current, send trip command, disconnect service entrance switch QF1.The overcurrent of other low pressure feeder line or short trouble relaying protection course of action are same as described above.
In the time there is earth fault in low pressure feeder line 1; feeder switch QF4, distribution transformer terminals detect the leakage current of the value that transfinites simultaneously; according to coordination relationship of protection; the out-of-limit setting value of leakage current of feeder switch QF4, operation time limit are all less than service entrance switch QF1; first feeder switch QF4 switch trips, and fault message and action situation are reported and submitted to distribution transformer terminals by interface.If feeder switch remarkable action, unsuccessful isolated fault point, distribution transformer terminals will still collect leakage current, send trip command, disconnect service entrance switch QF1.The electric leakage relaying protection course of action of other low pressure feeder line is same as described above.
Voltage class relaying protection: in the time of the voltage class faults such as low-voltage distribution network generation overvoltage, under-voltage, phase shortage, negative phase sequence; distribution transformer terminals is by the each phase voltage effective value, the phase angle that collect; compare with default voltage class relay protection setting value; failure judgement type; and send trip command by control interface; connect the shunt release MX1 power supply of service entrance switch QF1, disconnect service entrance switch QF1, complete voltage class fault relaying protection tripping operation action.For distribution box; voltage class fault mainly comes from mains side; distribution transformer one secondary side, neutral ground line and distribution box inlet wire cable fault; its fault effects mask has of overall importance; therefore; service entrance switch QF1 is decided to be to the relay protection device of voltage class fault, other switch can not carried out such fault relaying protection.
Automatic reclosing: in the current capacity fault such as the overcurrent of low voltage electric network, short circuit, leakage current are out-of-limit; provisional fault proportion is larger; long-range main website manages each feeder switch by distribution transformer terminals; reclosing parameter is sent to the intelligent controller of each feeder switch; independently carry out fault relaying protection by each feeder switch; and carry out the operation of one or many automatic reclosing, after reclosing is unsuccessful, feeder switch is placed in to reclosing block state.For voltage class fault, in single supply low-voltage distribution network system, its fault point is mainly at the mains side of service entrance switch, distribution transformer terminals monitors after fault message, send trip command and disconnect service entrance switch, and voltage, electric current and phase relation situation of change thereof before and after tripping operation are analyzed, the automatic decision reason that is out of order, and continuation monitoring mains side change in voltage situation continuously, according to failure cause and change in voltage situation, service entrance switch is carried out to electric switch-on operation locking automatically, prevent tape jam combined floodgate power transmission.After the fault from mains side is got rid of, just can carry out manually or automatically closing operation.
Closing locking: due to some outside causes, cause distribution transformer to output to each phase voltage size, the phase angle of electric energy of distribution box undesirable, as: distribution transformer high-pressure side under-voltage, the phase shortage that phase, internal fault cause of breaking, or the bad or single-phase overvoltage that causes of broken string or under-voltage of distribution transformer neutral ground detected, the closing function of distribution transformer terminals automatic blocking service entrance switch, prevent that undesirable electric energy is outputed to user's initiating failure to be expanded, or prevent the service entrance switch tripping operation of closing a floodgate repeatedly.Each feeder switch reclosing block function is realized according to parameter preset by its intelligent controller.
Load adjustment: distribution transformer terminals calculates automatically according to data such as gathered voltage, electric current, distribution transformer oil temperature, each feeder line branch currents and comprehensively judgement, when the load of distribution transformer, temperature are in the time approaching its ultimate bearing capacity, for preventing that the failure accidents such as Distribution Transformer Burning from expanding, distribution transformer terminals initiatively sends load adjustment instruction according to predefined parameter, disconnect one or more feeder switch, realize automatic deloading.After temperature, the load current of distribution transformer drop to a certain degree, while possessing the loading condition of increasing, automatically the feeder switch having disconnected is closed a floodgate again, the power consumer under respective feed connection is continued to power supply.
Long-range main website, PDA terminal illustrate with the relation between distribution box and interactive situation: between long-range main website and distribution box, realize access 2G/3G mobile wireless public network or optical-fibre channel composition digitisation bidirectional remote measuring and controlling system by the attached remote communication module of distribution transformer terminals, long-range main website is a set of automated management system, be responsible for unified management, collection, configuration or adjust multiple distribution box equipment, parameter and service data, the directly each switchgear in remote operation distribution box.Between PDA termination rack, by the built-in short-range communication module of distribution transformer terminals, by bluetooth (Bluetooth), the networking of WiFi wireless network, realize closely maintenance management of distribution box.
The overvoltage fault of voltage class relaying protection, refers to the power-frequency overvoltage that electric power system internal fault causes, mainly comprises: the overvoltage that (1) broken neutral line or imperfect earth cause neutral point excursion to cause; (2) resonance overvoltage.The lightning overvoltage that low voltage electric network is caused by outside thunderbolt, its duration is short, surge voltage amplitude is high, and the type overvoltage coordinates realization protection by the lightning arrester (or Surge Protector) being connected on distribution box 0.4kV bus with feeder switch.
It is same as the prior art that the present embodiment is not stated part.

Claims (9)

1. a protection measurement and control integration comprehensive distribution box, is characterized in that: include current transformer, zero sequence current mutual inductor, reactive power compensator, control mains switch, reactive power compensation switch, service entrance switch, feeder switch, Distribution Transformer Terminal Unit, described Distribution Transformer Terminal Unit includes analogue collection module, digital signal processor, CPU processor, clock module, digital storage, I/O module, communication module, described analogue collection module is connected with CPU processor by DSP digital signal processor, clock module, digital storage, I/O module, communication module is connected with CPU processor respectively, and described Distribution Transformer Terminal Unit also has control interface, quantity of state is adopted interface and communication interface, described reactive power compensation switch, service entrance switch, control mains switch, feeder switch and reactive power compensator are connected with Distribution Transformer Terminal Unit by interface, between described protection measurement and control integration comprehensive distribution box and distribution transformer, adopt power cable to be connected, in distribution transformer inside, temperature sensor is installed, temperature sensor passes to Distribution Transformer Terminal Unit by signal cable by signal, the Distribution Transformer Terminal Unit communication connection that is also connected with long-range main website or/and terminal equipment PDA by communication module.
2. protection measurement and control integration comprehensive distribution box according to claim 1, is characterized in that: an electrical wiring access point of current transformer, zero sequence current mutual inductor, distribution transformer terminals, control power module is all located at the electric power incoming line side of service entrance switch.
3. protection measurement and control integration comprehensive distribution box according to claim 2; it is characterized in that: the analogue collection module of described protection measurement and control integration comprehensive distribution box comprises three-phase voltage, electric current, leakage current, temperature Four types collection terminal, gathers respectively corresponding types analog data.
4. protection measurement and control integration comprehensive distribution box according to claim 3; it is characterized in that: described current transformer is made up of three electric parameters, characteristic same current instrument transformer; be used for gathering inlet wire cable A, B, C three-phase current signal, the current acquisition terminal of its secondary side lead-in wire access Distribution Transformer Terminal Unit analogue collection module.
5. protection measurement and control integration comprehensive distribution box according to claim 4; it is characterized in that: inlet wire cable A, B, C phase line and zero line pass the iron core of zero sequence current mutual inductor jointly; zero sequence current mutual inductor secondary side access distribution transformer terminals analogue collection module leakage current gathers terminal, realizes the collection of residual current signal.
6. protection measurement and control integration comprehensive distribution box according to claim 5, is characterized in that: service entrance switch is frame-type or the plastic shell low voltage breaker with shunt release, motor-operating mechanism and auxiliary switch annex.
7. protection measurement and control integration comprehensive distribution box according to claim 6, is characterized in that: reactive power compensation switch, control mains switch adopt the plastic shell low voltage breaker with shunt release and auxiliary switch annex.
8. protection measurement and control integration comprehensive distribution box according to claim 7; it is characterized in that: feeder switch adopts the intelligent comprehensive earth leakage protective device with communication interface; communicate by its RS485 or RS232 interface and Distribution Transformer Terminal Unit, and accept the monitoring of distribution transformer terminals.
9. protection measurement and control integration comprehensive distribution box according to claim 8, it is characterized in that: described protection measurement and control integration comprehensive distribution box also includes control power module, described control power module is introduced three phase mains through controlling mains switch from distribution box point of incoming cables, through conversion, voltage stabilizing, after filtering/rectification is processed, single phase alternating current (A.C.)/the DC control supply of outputting high quality, control the same service entrance switch of power module outlet, reactive power compensation switch, control the shunt release of mains switch, motor-operating mechanism is connected, for above-mentioned three switchgears provide point, closing operation control power supply, control power module and also can be uncompensated device, feeder switch provides the operation power supply of high-quality high reliability and controls power supply.
CN201320723448.7U 2013-11-13 2013-11-13 Comprehensive distribution box integrating protection, measurement and control Expired - Fee Related CN203660664U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103618381A (en) * 2013-11-13 2014-03-05 国家电网公司 Protecting and measuring integrated comprehensive distribution box
CN107017642A (en) * 2017-04-01 2017-08-04 国家电网公司 A kind of low-voltage comprehensive distribution box for improving power supplying efficiency
CN108802536A (en) * 2018-06-29 2018-11-13 山东卓尔电气有限公司 A kind of household electricity consumption situation Centralizing inspection method and monitoring device
CN108879599A (en) * 2018-07-16 2018-11-23 国网辽宁省电力有限公司盘锦供电公司 A kind of broken neutral line protective device
CN109494583A (en) * 2018-12-29 2019-03-19 国网福建省电力有限公司厦门供电公司 AC load shifts distribution box

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103618381A (en) * 2013-11-13 2014-03-05 国家电网公司 Protecting and measuring integrated comprehensive distribution box
CN103618381B (en) * 2013-11-13 2017-06-20 王成楷 Protection measurement and control integration comprehensive distribution box
CN107017642A (en) * 2017-04-01 2017-08-04 国家电网公司 A kind of low-voltage comprehensive distribution box for improving power supplying efficiency
CN107017642B (en) * 2017-04-01 2023-09-01 国家电网公司 Low-voltage comprehensive distribution box capable of improving power supply efficiency
CN108802536A (en) * 2018-06-29 2018-11-13 山东卓尔电气有限公司 A kind of household electricity consumption situation Centralizing inspection method and monitoring device
CN108879599A (en) * 2018-07-16 2018-11-23 国网辽宁省电力有限公司盘锦供电公司 A kind of broken neutral line protective device
CN109494583A (en) * 2018-12-29 2019-03-19 国网福建省电力有限公司厦门供电公司 AC load shifts distribution box

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