CN111799884A - Power supply switching device for user metering and collecting terminal - Google Patents
Power supply switching device for user metering and collecting terminal Download PDFInfo
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- CN111799884A CN111799884A CN202010576938.3A CN202010576938A CN111799884A CN 111799884 A CN111799884 A CN 111799884A CN 202010576938 A CN202010576938 A CN 202010576938A CN 111799884 A CN111799884 A CN 111799884A
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention relates to a double-loop power supply matching device, in particular to a power supply switching device of a user metering acquisition terminal. The problem of present two return circuits have information acquisition equipment for a long time not electrified influence equipment clock accuracy and data save etc. technical problem is solved. The user measures the power switching device of the acquisition terminal, including 3 groups of terminal connections, 3 intermediate relays; the intermediate relays are all intermediate relays with four groups of normally open and normally closed contacts and comprise a # 1 relay, a # 2 relay and a # 3 relay; the 3 groups of wiring terminals are respectively used as A1 and C1 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the main supply loop, A2 and C2 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the standby supply loop, and A 'and C' terminals connected with the A phase and the C phase of the acquisition terminal and the auxiliary power supply terminal of the electric energy meter.
Description
Technical Field
The invention relates to a double-loop power supply matching device, in particular to a power supply switching device of a user metering acquisition terminal.
Background
The realization of the full coverage, full collection and full application targets of the power utilization information collection system is one of key marketing works of the current power enterprises and is also one of basic works of production and operation activities of power service companies. The remote meter reading is one of the most basic functions in the load management system, and plays an important role in electric charge recovery, completion of operation indexes and statistical analysis. In recent years, some users mainly supply power for use, and standby power for use is not used frequently, so that the power failure of a meter terminal is caused, and the acquisition success rate is influenced. For example, the dual power supplies of the residential community are used, the main power supply supplies power for a normal state, and the standby power supply is switched back (main and standby power supply locking) only when the main power supply is in a power failure state, so that important loads of the residential community are supplied. Due to the fact that the incoming line disconnecting link of the main power supply and the standby power supply is locked, the high-voltage metering point meter at the side of the main power supply and the terminal are normal, and the high-voltage metering point meter at the side of the standby power supply and the terminal lose power. For users with double power supplies such as an expressway, the power supply capacities of a main power supply and a standby power supply are equal, and the users are switched back and forth regularly. Due to the fact that the incoming line disconnecting link of the main power supply and the standby power supply is locked, the high-voltage metering point meter terminal on one side is normal, and the high-voltage metering point meter and the terminal on the other side lose power. In statistics of terminal uploading data, a set of terminals of a double-loop user are always in a standby power-off state, namely, a shutdown user needs to be dispatched to a shutdown user management section. If the power utilization circuits of the users are switched frequently in the period, the two sets of terminals are correspondingly operated and shut down, the data of the electric energy meter cannot be monitored in real time, the timeliness of the data called for and tested by the negative control master station on the terminals is influenced, and various acquisition indexes are also influenced.
The acquisition terminal is an important component of the power consumption information acquisition system and is used for carrying out real-time monitoring on power acquisition of a user. Because the III-type special transformer acquisition terminal adopts single power supply access (uses a voltage transformer secondary voltage) in a power supply mode and has no auxiliary power supply, when a main supply circuit of a user in a double-loop power supply mode is repaired or fails, the user adopts a standby loop to supply power, and the main supply load control terminal loses a working power supply, so that the data of the electric energy meter cannot be uploaded normally through the load control terminal. Because the acquisition equipment works under an abnormal state, the metering device is not electrified for a long time, the accuracy of the clock of the equipment and the storage of data are influenced, and the acquisition equipment is not electrified, so that the normal operation of a transmission card of the acquisition equipment is influenced, and the success rate of data acquisition and the completion of three-full indexes are influenced. When the load control terminal is disconnected, the system loses the supervision on the power load condition of the user, and the master station judges that the terminal has a fault and needs to be checked and processed on site. When a user switches the main power supply to the standby power supply, the power supply required by the negative control terminal needs to be changed and adjusted on site by a worker, and the maintenance workload of the worker is increased.
In view of the technical problems that the accuracy of the clock of the information acquisition equipment and the storage of data are affected due to the fact that the information acquisition equipment is not electrified for a long time and the workload is increased during the master-slave switching, a power supply switching device needs to be developed to solve the problems.
Disclosure of Invention
The invention provides a power supply switching device of a user metering acquisition terminal, which aims to solve the technical problems that the accuracy of a clock of equipment, the storage of data and the like are influenced due to the fact that information acquisition equipment is not electrified for a long time in the existing double-loop.
The invention is realized by adopting the following technical scheme: the user measures the power switching device of the acquisition terminal, including 3 groups of terminal connections, 3 intermediate relays; the intermediate relays are all intermediate relays with four groups of normally open and normally closed contacts and comprise a # 1 relay, a # 2 relay and a # 3 relay; the 3 groups of wiring terminals are respectively used as A1 and C1 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the main supply loop, A2 and C2 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the standby supply loop, and A 'and C' terminals connected with the A phase and the C phase of the acquisition terminal and the auxiliary power supply terminal of the electric energy meter;
the main supply inputs A1 and C1 are connected to two ends of a coil of the 1# relay through an air switch, meanwhile, A1 is connected in parallel to a first group of normally open terminals of the 1# relay and a first group of common terminals of the 2# relay, the first group of common terminals of the 1# relay is connected to one end of the coil of the 2# relay, and the first group of normally open terminals of the 2# relay is connected to a first group of normally closed terminals of the 3# relay; c1 is connected in parallel with the other end of the coil of the 2# relay and the second group of common terminals of the 2# relay, and the second group of normally open terminals of the 2# relay is connected to the second group of normally closed terminals of the 3# relay;
after the standby power input A2 and C2 pass through an air switch, A2 is connected to a third group of normally open terminals of the 3# relay and a second group of common terminals of the 1# relay, a second group of normally closed terminals of the 1# relay are connected to one end of a coil of the 3# relay, and a third group of common terminals of the 3# relay are connected to a third group of normally closed terminals of the 2# relay; c2 is connected in parallel with the other end of the coil of the 3# relay and the fourth normally open terminal of the 3# relay, and the common terminal of the fourth group of the 3# relay is connected with the fourth normally closed terminal of the 2# relay;
the switching output A' is connected to the third group of common terminals of the 2# relay line and the first group of common terminals of the 3# relay in parallel; c' is connected to the four groups of common terminals of the 2# relay and the second group of common terminals of the 3# relay in parallel.
A terminal power supply switching device is additionally arranged on a double-loop power supply mode user with the current terminal equipment of the load management system, so that the function of realizing remote automatic meter reading is not influenced when the double-loop user switches loops to use power, the function construction of the load management system is perfected, and the work efficiency of meter reading, charging and settlement of the load control user of a power supply company is improved. Because the GPRS load management terminal adopts single power supply access in the power supply mode, when the main power supply line of a user in the double-loop power supply mode is repaired or fails and the user adopts the standby loop to supply power, the load control terminal loses the working power supply, so that the data of the electric energy meter cannot be uploaded normally through the load control terminal, and meanwhile, the monitoring on the power consumption load condition of the user is lost.
When the negative control terminal is disconnected and data cannot be monitored, the master station judges that the terminal has a fault and needs to be checked and processed on site. When a user switches a main power supply to a standby power supply, a power supply required by the negative control terminal needs to be subjected to on-site rerouting adjustment by a worker, data cannot be uploaded in time, the maintenance workload of the worker is increased, and a normal maintenance work plan of the negative control terminal cannot be well completed.
In statistics of terminal uploading data, a set of terminals of a double-loop user are always in a standby power-off state, namely, a shutdown user needs to be dispatched to a shutdown user management section. If the power utilization circuits of the users are switched frequently in the period, the two sets of terminals are correspondingly operated and shut down, the data of the electric energy meter cannot be monitored in real time, and the timeliness of the data called for and tested by the negative control master station on the terminals is influenced. After the power supply switching device is installed, uninterrupted power supply of the double-loop user negative control terminal power supply can be realized, active management is implemented on the negative control terminal, and the double-loop user negative control terminal always runs on line.
Furthermore, the relay coils are connected with LED live indicating lamps in parallel; two ends of the 1# relay coil are connected with a main power supply voltmeter; and two ends of the 3# relay coil are connected with a standby power supply voltmeter.
The remote monitoring module is taken from the normally open and normally closed of each group of 1# and 3# relays to judge the running states of the main and standby power supply relays and send the main station personnel through short messages.
The invention has the beneficial effects that:
1. creatively solves the realization of the targets of full coverage, full acquisition and full application
The double-power-supply switching device provided by the invention has no meter terminal with the double-power-supply switching device in the equipment sequence of the national power grid company at present. Therefore, in order to realize the 'three-full' target and improve the acquisition success rate, a dual-power switching device is developed by combining the existing meter terminal, and the acquisition full-coverage, full-acquisition and full-application targets are creatively realized by the data of field test and running state monitoring of the equipment.
2. Changes the prior power supply mode
The dual-power switching device is added, the relays 1 and 2 are normally on when the main power supply supplies power, the relay 3 is normally on when the standby power supply supplies power, the main power supply and the standby power supply are all electrified, the main power supply is acquiescent, and the power supply guarantee of the equipment is achieved. The device is different from a common meter and a terminal in that the common meter and the terminal provide power through an access line, and the meter and the terminal are additionally provided with a dual-power switching device to increase the power supply capacity. The power supply of the electric energy meter is supplied by a circuit and an auxiliary power supply, and the two power supply modes are independent from each other, do not influence each other and can be uninterruptedly and automatically converted.
3. Frequent start and stop of user electric equipment are improved
Due to the operation mode of a user, the field-mounted electric energy meter is in an operation state of one-way electrification, one-way stopping or two-way frequent starting and stopping switching for a long time, so that the meter and the acquisition equipment cannot work normally, the normal operation of the power utilization information acquisition work is directly influenced, and the completion of the three-in-one target is influenced. Through a large amount of analysis investigation to the field situation to collection equipment power supply is the breach, and dual power switching device's application has solved metering device and has stopped the emergence of the abnormal phenomenon of equipment under the state of having a power failure or frequently opening and stop, and no matter which way equipment open and stop the obtaining whole journey control that the running condition all does not have the dead angle.
4. Improve the success rate of acquisition
A standby user can only collect one meter by one dual power supply all the time, and the user automatically disconnects an incoming line disconnecting switch or one line to have power failure for maintenance and fault power failure, so that the working power supply of the meter is lost, and normal collection and communication cannot be realized. The dual-power switching device is additionally arranged, the problems that a standby power meter and a terminal are not electrified are solved, an experiment is carried out on a user, the fact that both the standby electric energy meter and the terminal are electrified is guaranteed, and the acquisition success rate is improved.
5. Solves the transmission blind area of data
Through the research to "dual power supply switching device" user operation, solve "dual power supply" and gather the blind area, solved dual power supply user because of the operation mode reason, can not normally carry out data transmission's problem. The device is additionally provided with the operation switching indicator lamp and the digital voltmeter (LED display), so that visual inspection by field personnel is facilitated, and the LED live indicator lamp is connected in parallel with the relay coil, so that the field personnel can quickly judge the operation condition of the device. When the main and standby input power supplies stop supplying power, the remote monitoring module sends out a short message alarm or a voice alarm, and transmits the short message alarm or the voice alarm to a mobile phone platform of a corresponding person to inform the sending power supply switching device of the real-time operation condition.
6. Improving stability of field devices
The implementation of the project ensures that the user with double power supplies can monitor the running state of the on-site metering device as long as the power failure of the whole plant does not occur, and the abnormal phenomenon of the metering device in the power failure or frequent start-stop state is avoided. The field maintenance workload is greatly reduced, the workload that the metering personnel must go to the field maintenance due to the change of the user operation mode is reduced, the monitoring effect is greatly improved, and the stability of the field equipment is improved through the additionally arranged device.
Drawings
FIG. 1 is one of the wiring diagrams of the power switching device.
FIG. 2 is a second wiring diagram of the power switching device.
Fig. 3 is an explanatory diagram of the operation of the relay.
Fig. 4 shows one of the schematic connections of the metering point terminal.
Fig. 5 shows a second schematic diagram of the terminal connections of the metering point.
Detailed Description
Collecting connecting terminals A1 and C1 of a power supply switching device are connected with an A phase and a C phase of a secondary voltage measured by a main supply loop; terminals A2 and C2 are connected with a phase A and a phase C for metering PT secondary voltage by a loop; the A 'and C' terminals are connected with the A phase and the C phase of the acquisition terminal and the auxiliary power supply terminal of the electric energy meter.
The acquisition power switching device adopts 3 intermediate relays (110V coils) with four groups of normally open and normally closed contacts to work. The model of the intermediate relay is JZX-22F (D)/4Z-110V.
As shown in fig. 1 and 2: the main supply inputs A1 and C1 are connected to two ends of a 1# relay coil through an air switch, meanwhile, A1 is connected in parallel with a first group of common terminals of a 2# relay of a first group of normally open terminals of the 1# relay, the first group of common terminals of the 1# relay is connected to one end (left) of the 2# relay coil, and the first group of normally open terminals of the 2# relay is connected to a first group of normally closed terminals of A3 # relay; c1 is connected in parallel with one end (right) of the coil of the 2# relay and the second group common terminal of the 2# relay, and the second group normally open terminal of the 2# relay is connected to the second group normally closed terminal of the 3# relay.
The standby inputs A2 and C2 are connected with a third group of normally open terminals of the 3# relay and a second group of common terminals of the 1# relay through an air switch A2, the second group of normally closed terminals of the 1# relay is connected to one end (left) of a coil of the 3# relay, and the third group of common terminals of the 3# relay is connected to the third group of normally closed terminals of the 2# relay; c2 is connected in parallel with one end (right) of the coil of the 3# relay and the fourth normally open terminal of the 3# relay, and the common terminal of the fourth group of the 3# relay is connected with the fourth normally closed terminal of the 2# relay.
The switching output A' is connected to the third group of common terminals of the 2# relay line and the first group of common terminals of the 3# relay in parallel; c' is connected to the four groups of common terminals of the 2# relay and the second group of common terminals of the 3# relay in parallel.
With reference to fig. 3, the main power supply supplies: 1. the 2# relay is normally on; the standby power supply supplies power: the No. 3 relay is normally on; and the main power supply and the standby power supply are electrified, and the output of the main power supply is defaulted.
The dual-loop user main supply loop supplies power, and the standby supply loop supplies power when power failure: the main supply voltages A1 and C1 are input into a 1# relay coil to be electrified, a first group of normally open contacts of the 1# relay act and are closed, so that a 2# relay coil is electrified, and a first group of normally open contacts and a second group of normally open contacts of the 2# relay act and are closed. A1 is connected with the output A' terminal of the switching device through a first group of normally open contacts of the 2# relay, a first group of normally closed contacts of the 3# relay; c1 outputs a C ' terminal through a switching device which is a second group of normally open contacts of the 2# relay, a second group of normally closed contacts of the 3# relay, and at the moment, A ' and C ' supply power to the electric energy meter and the collection terminal.
1) The double-loop user supplies power to the backup loop and the main loop is powered off: the standby supply voltage A2 is electrified through a second group of normally closed contacts of the 1# relay and a coil of the 3# relay input by C2, and the first to fourth groups of normally closed contacts of the 3# relay are opened and normally open contacts are closed. A2 is connected with the output A' terminal of the switching device through a third group of normally open contacts of the 3# relay, a third group of normally closed contacts of the 2# relay; c2 outputs C ' terminal through switching device of the fourth group of normally open contacts of the 3# relay, the fourth group of normally closed contacts of the 2# relay, and at the moment, A ' and C ' supply power to the electric energy meter and the collection terminal.
2) When the main and standby dual-circuit user supply circuits are all in live operation: no 1# relay coil is connected with any contact in series, and the 3# relay coil is connected with the second group of normally closed contacts of the 1# relay in series, so that the 1# relay coil is electrified after main supply voltages A1 and C1 are input, the second group of normally closed contacts of the 1# relay act and break to form interlocking, the 3# relay coil cannot be electrified, and corresponding normally open normally closed contacts cannot act, so that when the main and standby supply circuits of a double-circuit user are electrified and operated, the default is that the main supply input voltage is switched and output.
The automatic power supply switching device is additionally arranged for the double-loop user, so that uninterrupted power supply of the double-loop user negative control terminal power supply can be realized, the problem of switching the double-power-supply user negative control terminal power supply is solved timely and effectively, and the terminal outage caused by non-fault reasons is avoided. The device is simple in structure and low in cost, the main components are relays, voltage signals of the two power supplies are monitored in real time through the relay tripping coil, and control signals are sent out in real time according to actual conditions, so that automatic switching of the main power supply and the auxiliary power supply is achieved. After the device is adopted, the terminal power supply is switched with the switching operation of the user after switching operation, the normal work can still be realized, and the maintenance personnel do not need to go to the site for maintenance. Therefore, the workload of maintainers is greatly reduced, the enterprise cost is saved, and the safety risk of field operation is reduced.
The power supply switching device is additionally arranged for a user in a double-loop power supply mode, so that the terminal of a double-loop user can directly switch a power supply during power supply switching, the condition that the user with double power supplies can monitor the operation condition of the on-site metering device as long as power failure does not occur is ensured, and the problem of system remote meter reading data loss of the metering device in the power failure or frequent start and stop states is solved. Meanwhile, the workload of field maintenance is greatly reduced, the workload that the metering personnel must go to the field maintenance due to the change of the user operation mode is reduced, and the monitoring effect is greatly improved. No matter which way of equipment is started or stopped, the running condition is monitored in the whole process without dead angles, the quality of collected data is effectively guaranteed, and the realization of the 'three-full' target is guaranteed.
Claims (7)
1. The user metering acquisition terminal power supply switching device is characterized by comprising 3 groups of connecting terminals and 3 intermediate relays, wherein the intermediate relays are four groups of normally open and normally closed intermediate relays and comprise a # 1 relay, a # 2 relay and a # 3 relay; the 3 groups of wiring terminals are respectively used as A1 and C1 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the main supply loop, A2 and C2 terminals connected with the A phase and the C phase of the PT secondary voltage measured by the standby supply loop, and A 'and C' terminals connected with the A phase and the C phase of the acquisition terminal and the auxiliary power supply terminal of the electric energy meter;
the main supply inputs A1 and C1 are connected to two ends of a coil of the 1# relay through an air switch, meanwhile, A1 is connected in parallel to a first group of normally open terminals of the 1# relay and a first group of common terminals of the 2# relay, the first group of common terminals of the 1# relay is connected to one end of the coil of the 2# relay, and the first group of normally open terminals of the 2# relay is connected to a first group of normally closed terminals of the 3# relay; c1 is connected in parallel with the other end of the coil of the 2# relay and the second group of common terminals of the 2# relay, and the second group of normally open terminals of the 2# relay is connected to the second group of normally closed terminals of the 3# relay;
after the standby power input A2 and C2 pass through an air switch, A2 is connected to a third group of normally open terminals of the 3# relay and a second group of common terminals of the 1# relay, a second group of normally closed terminals of the 1# relay are connected to one end of a coil of the 3# relay, and a third group of common terminals of the 3# relay are connected to a third group of normally closed terminals of the 2# relay; c2 is connected in parallel with the other end of the coil of the 3# relay and the fourth normally open terminal of the 3# relay, and the common terminal of the fourth group of the 3# relay is connected with the fourth normally closed terminal of the 2# relay;
the switching output A' is connected to the third group of common terminals of the 2# relay line and the first group of common terminals of the 3# relay in parallel; c' is connected to the four groups of common terminals of the 2# relay and the second group of common terminals of the 3# relay in parallel.
2. The user metering collection terminal power switching device of claim 1, wherein the relay coils are connected in parallel with LED live indicator lamps.
3. The user metering acquisition terminal power switching device of claim 1 or 2, wherein a main supply voltage meter is connected to two ends of a 1# relay coil; and two ends of the 3# relay coil are connected with a standby power supply voltmeter.
4. The power switching device of the user metering and collecting terminal as claimed in claim 1 or 2, wherein the collecting terminal and the electric energy meter are provided with auxiliary power supplies, and the auxiliary power supplies are supplied by terminals A 'and C'.
5. The user metering acquisition terminal power switching device of claim 3 wherein the acquisition terminal and the electric energy meter are provided with auxiliary power supplies, and the auxiliary power supplies are supplied by the terminals A 'and C'.
6. The power switching device of the user metering and collecting terminal as claimed in claim 1 or 2, wherein the model of the intermediate relay is JZX-22F (D)/4Z-110V.
7. The power switching device of the user metering and collecting terminal as claimed in claim 4, wherein the model of the intermediate relay is JZX-22F (D)/4Z-110V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010576938.3A CN111799884A (en) | 2020-06-23 | 2020-06-23 | Power supply switching device for user metering and collecting terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010576938.3A CN111799884A (en) | 2020-06-23 | 2020-06-23 | Power supply switching device for user metering and collecting terminal |
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| Publication Number | Publication Date |
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| CN111799884A true CN111799884A (en) | 2020-10-20 |
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| CN202010576938.3A Pending CN111799884A (en) | 2020-06-23 | 2020-06-23 | Power supply switching device for user metering and collecting terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280341A (en) * | 2021-12-24 | 2022-04-05 | 广东电网有限责任公司 | Experimental terminal box of electric energy meter |
-
2020
- 2020-06-23 CN CN202010576938.3A patent/CN111799884A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114280341A (en) * | 2021-12-24 | 2022-04-05 | 广东电网有限责任公司 | Experimental terminal box of electric energy meter |
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