CN114113723A - Electric energy meter live-line replacement method and device without electric quantity loss - Google Patents
Electric energy meter live-line replacement method and device without electric quantity loss Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
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- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
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Abstract
The application discloses a method and a device for replacing an electric energy meter without electric quantity loss in an electrified way, comprising the following steps: connecting the electric energy meter of the test gateway and the electric energy meter of the switched gateway in parallel; removing current wiring of the electric energy meter of the switched port; recording the bottom electricity quantity of the electric energy meter of the switched gateway; removing the electric energy meter voltage connection wire of the switched port; installing the newly-installed gateway electric energy meter at the position of the gateway electric energy meter to be changed; removing current wiring of the electric energy meter at the test gateway; recording the variation of the electric quantity of the electric energy meter at the bottom of the test gateway; dismantling the electric energy meter voltage connection wire of the test gateway; forming feedback data by the recorded bottom electricity quantity of the electric energy meter of the switched gateway and the bottom electricity quantity variable quantity of the electric energy meter of the test gateway; and finishing meter replacement after confirming that the newly installed gateway electric energy meter works normally. The method and the device provided by the application have the advantages that the electric energy meter is connected into the operated circuit, the electric quantity loss when the electric energy meter is changed in a charged mode can be effectively obtained, the problem that the electric quantity compensation is inaccurate when the electric energy meter is changed on line in the prior art is solved, and the economic benefits of both parties of an electric power trade are practically guaranteed.
Description
Technical Field
The embodiment of the application relates to the technical field of electric energy metering, in particular to a method and a device for replacing an electric energy meter in a charged mode without electric quantity loss.
Background
The electric energy meter is used as an important metering device for electric energy settlement and assessment among power grid enterprises and between the power grid enterprises and power generation or power supply enterprises, has a certain service cycle and needs to be replaced periodically. In order to ensure the normal operation of the power enterprise, the electric energy meter is generally replaced in a charged state, so that part of electric quantity loss is involved in the meter replacement process. In order to guarantee the legitimate interests of power generation and supply enterprises, the lost electric quantity needs to be compensated.
In general, the compensation method for the loss of electric power during the table changing includes an average power method and a curve fitting method. The principle of the average power method is to record instantaneous voltage, current, power factors and meter changing time before the electric energy meter is changed, and to estimate the loss electric quantity in the meter changing process by taking the instantaneous power before the meter is changed as the average power during the meter changing period; the principle of the curve fitting method is that voltage wiring of the electric energy meter field check meter is connected to a loop in parallel, current wiring is connected to the loop in series, starting and stopping time of meter changing is recorded, then a function of an active power discrete point is obtained by utilizing a curve fitting algorithm, and lost electric quantity is calculated by utilizing an integral equation.
However, both of the above methods have respective drawbacks in practical use. When the average power method is applied to fluctuating loads such as photovoltaic load, wind power load and the like, the problems of large calculated loss electric quantity error and inaccurate meter changing time exist; although the accuracy of compensating the electric quantity is improved to a certain degree by the curve fitting algorithm, the meter changing time and the electric quantity compensation error cannot be fundamentally solved. Therefore, many power customers call into question the electric quantity compensation method during the current meter changing period, and the fairness and the justice of the power trade are always influenced.
Disclosure of Invention
The application provides an electric energy meter live replacement method and device without electric quantity loss, and aims to solve the problem that electric quantity compensation is inaccurate when an electric energy meter is replaced on line in the prior art, and practically guarantee economic benefits of both electric power trade parties.
In order to achieve the above technical object, in one aspect, the present application provides a method for replacing an electric energy meter with no loss of electric energy, where the method includes:
sequentially and correspondingly connecting voltage terminals of the test gateway electric energy meter in parallel to a voltage loop of the switched gateway electric energy meter;
sequentially and correspondingly connecting the current terminals of the test gateway electric energy meter to the current circuit of the switched gateway electric energy meter in series according to the phase sequence, and forming a parallel relation with the current circuit of the switched gateway electric energy meter;
sequentially removing the current terminal connection of the switched gateway electric energy meter to obtain a circuit section current line interface;
recording the bottom electricity quantity of the electric energy meter of the switched gateway;
sequentially removing the voltage terminal connection of the switched electric energy meter according to the phase sequence to obtain a circuit section voltage line interface;
sequentially connecting the voltage line interface of the circuit end to a voltage terminal of the electric energy meter of a new gateway;
sequentially connecting the current line interface at the circuit end into the current terminal of the electric energy meter at the new installation gateway through a novel combined junction box for the electric energy meter according to the phase sequence, and forming a parallel connection relation with the current circuit of the electric energy meter at the test gateway;
sequentially removing the current terminal connection wires of the electric energy meter at the test gateway;
recording the variation of the bottom electricity quantity of the electric energy meter of the test gateway;
sequentially removing the voltage terminal connection wires of the electric energy meter at the test gate;
forming feedback data by the recorded bottom electricity quantity of the electric energy meter of the switched gateway and the bottom electricity quantity variable quantity of the electric energy meter of the test gateway;
and finishing meter replacement after confirming that the electric energy meter of the new gateway works normally.
Further, the variation of the bottom electricity quantity of the electric energy meter at the test gateway is the loss electricity quantity W during the meter changing period; the loss electric quantity W during meter replacement comprises the variation W when the test gateway electric energy meter is connected with the replaced gateway electric energy meter in parallel1The variation W of the electric energy meter at the test gate when the electric energy meter is in the circuit alone2And the variable quantity W when the test gateway electric energy meter is connected with the newly-installed gateway electric energy meter in parallel3。
Further, the calculation formula of the loss electric quantity W during the table changing period is as follows:
W＝W1+W2+W3＝(Ua×Ia2×cosθa+Ub×Ib2×cosθb+Uc×Ic2×cosθc)×t1+(Ua×Ia×cosθa+Ub×Ib×cosθb+Uc×Ic×cosθc)×t2+(Ua×Ia2×cosθa+Ub×Ib2×cosθb+Uc×Ic2×cosθc)×t3；
wherein: ua, Ub and Uc are the internal voltage of the electric energy meter of the switched gateway; ia. Ib and Ic are internal currents of the switched electric energy meter; t is t1The time when the test gateway electric energy meter is connected with the switched gateway electric energy meter in parallel is used; t is t2Is the time of the electric energy meter of the test gateway in the circuit alone; t is t3And the time for connecting the electric energy meter at the test gateway and the electric energy meter at the newly-installed gateway in parallel is used.
On the other hand, this application still provides a loss-free electric energy watchband electricity change device of electric quantity, includes: the device is characterized by also comprising a novel combined junction box for the electric energy meter, a test gateway electric energy meter and a new gateway electric energy meter; wherein: the voltage line and the current line are respectively used for connecting a secondary voltage loop and a current loop of the test gateway electric energy meter and the switched gateway electric energy meter; the crocodile clip is used for acquiring the voltage of the electric energy meter at the test gateway; the clamp-on ammeter is used for detecting whether the electric energy meter of the test gateway and the current wiring of the electric energy meter are correct or not; the test gateway electric energy meter is used for recording the loss electric quantity during meter replacement, and the newly-installed gateway electric energy meter is used for replacing the replaced gateway electric energy meter.
Further, the background of the electric energy meter at the test gateway is a known value.
Furthermore, the replaced gateway electric energy meter and the test gateway electric energy meter are electric meters with the same specification and the same model.
The utility model provides a method and device are changed with electricity to electric energy meter that electric quantity is lossless is electrified, through being inserted experimental gate electric energy meter in the operating circuit, can effectively acquire the electric quantity loss when the electric energy meter is electrified to change to solve among the prior art problem that the electric energy meter is online to be changed the electric quantity and compensate inaccurate, guarantee electric power trade both sides's economic benefits conscientiously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for replacing a power strip of an electric energy meter without power loss according to the present application;
FIG. 2 is a wiring diagram of the electric energy meter with a changed gateway before the meter is changed;
FIG. 3 is a wiring diagram of a secondary circuit of a test gateway electric energy meter accessing a switched gateway electric energy meter;
FIG. 4 is a diagram illustrating a removed power meter for a switched gateway according to the present application;
FIG. 5 is a connection diagram of an electric energy meter access loop of the new gateway of the present application;
FIG. 6 is a diagram of the application of the test gateway after the electric energy meter is removed and replaced.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below to clearly and completely describe the technical solutions in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a method for replacing an electric energy meter with no loss of electric energy;
as shown in fig. 1, in one aspect, the present application provides a method for electrically replacing a power strip without loss of power, the method comprising:
as shown in fig. 2, fig. 2 is a wiring diagram of the electric energy meter with a changed gateway before the meter is changed; at the moment, the electric quantity recorded by the gateway-changed electric energy meter is the electric quantity of the metering point; the formula of the electric quantity of the metering point is as follows:
wherein Ua, Ub and Uc are the internal voltage of the electric energy meter of the switched gateway; ia. Ib and Ic are internal currents of the switched electric energy meter; i isa＝Ia1，Ib＝Ib1，Ic＝Ic1；UnIs the ground voltage.
Sequentially and correspondingly connecting voltage terminals of the test gateway electric energy meter to a voltage loop of the switched gateway electric energy meter in parallel according to the phase sequence; checking the voltage value of the electric energy meter at the test gateway and confirming whether the wiring is correct and firm;
sequentially and correspondingly connecting the current terminals of the test gateway electric energy meter to the current circuit of the switched gateway electric energy meter in series according to the phase sequence, forming a parallel connection relation with the current circuit of the switched gateway electric energy meter, and measuring and checking the current value of the test gateway electric energy meter by using a pincer-shaped ammeter to confirm whether the wiring is correct and firm; as shown in fig. 3, fig. 3 is a wiring diagram of a secondary loop of the test gateway electric energy meter accessing the replaced gateway electric energy meter; according to the relation of parallel connection of the voltage loops and series connection of the current loops, the sum of the electric quantity recorded by the replaced gateway electric energy meter and the test gateway electric energy meter is the electric quantity of the metering point; the formula of the electric quantity of the metering point is as follows:
wherein, Ia＝Ia1+Ia2，Ia1≈Ia2，Ib＝Ib1+Ib2，Ib1≈Ib2，Ic＝Ic1+Ic2，Ic1≈Ic2；t1The time of the parallel connection of the test gateway electric energy meter and the switched gateway electric energy meter is shown.
Sequentially removing the current terminal connection of the switched electric energy meter, wrapping the current terminal connection with an insulating adhesive tape, measuring and checking the current value of the switched electric energy meter by using a pincer-shaped ammeter, and determining whether the switched electric energy meter can be removed or not to obtain a circuit section current line interface;
recording the bottom electricity quantity of the electric energy meter of the switched gateway;
sequentially removing the voltage terminal connection wires of the electric energy meter with the switched gateway according to the phase sequence, and wrapping the voltage terminal connection wires with an insulating adhesive tape to obtain a circuit section voltage wire interface; as shown in fig. 4, fig. 4 is a wiring diagram of the switched port electric energy meter according to the present application, which is removed; at the moment, the electric quantity recorded by the electric energy meter at the test gateway is the electric quantity of the metering point; the formula of the electric quantity of the metering point is as follows:
W2＝(Ua×Ia2×cosθa+Ub×Ib2×cosθb+Uc×Ic2×cosθc)×t2，
wherein, Ia＝Ia2，Ib＝Ib2，Ic＝Ic2；t2Is the time of the electric energy meter of the test gateway in the circuit alone.
Fixing the newly-installed gateway electric energy meter on an electric energy meter screen cabinet, sequentially connecting a voltage line interface at the circuit end to a voltage terminal of the newly-installed gateway electric energy meter, and checking the voltage value of the newly-installed gateway electric energy meter to confirm whether wiring is correct and firm;
sequentially connecting the current line interface of the circuit end into the current terminal of the electric energy meter of the new gateway through a novel combined junction box for the electric energy meter according to the phase sequence, forming a parallel connection relation with the current circuit of the electric energy meter of the test gateway, and checking the current value of the electric energy meter of the new gateway to confirm whether the wiring is correct and firm; as shown in fig. 5, fig. 5 is a wiring diagram of an access loop of an electric energy meter of a new gateway of the present application; according to the relation of parallel connection of the voltage loops and series connection of the current loops, the sum of the electric quantity recorded by the newly-installed gateway electric energy meter and the test gateway electric energy meter is the electric quantity of the metering point; the formula of the electric quantity of the metering point is as follows:
wherein, Ia＝Ia3+Ia2，Ib＝Ib3+Ib2，Ic＝Ic3+Ic2；t3And the time for connecting the electric energy meter at the test gateway and the electric energy meter at the newly-installed gateway in parallel is used.
Sequentially removing the current terminal connection of the electric energy meter at the test gateway, and measuring and checking the current value of the electric energy meter at the test gateway by using a clamp-on ammeter so as to confirm whether the connection is completely removed;
recording the variation of the bottom electricity quantity of the electric energy meter of the test gateway;
sequentially removing the voltage terminal connection wires of the electric energy meter at the test gate; as shown in fig. 6, fig. 6 is a wiring diagram of the electric energy meter at the test gateway of the present application, which is disassembled and replaced with a meter; at the moment, the electric quantity recorded by the electric energy meter newly installed at the gateway is the electric quantity of the metering point; the formula of the electric quantity of the metering point is as follows:
as shown in fig. 6, when the electric energy meter at the test gateway is removed, the voltage of the electric energy meter at the test gateway is not changed, and the loop current relationship is Ia3＝Ia，Ib3＝Ib，Ic3＝IcThen the electricity quantity formula of the metering point is as follows:
forming feedback data by the recorded bottom electricity quantity of the electric energy meter of the switched gateway and the bottom electricity quantity variable quantity of the electric energy meter of the test gateway; confirming the feedback data with the client;
and finishing meter replacement after confirming that the electric energy meter of the new gateway works normally.
Further, the variation of the bottom electricity quantity of the electric energy meter at the test gateway is the loss electricity quantity W during the meter changing period; the loss electric quantity W during meter replacement comprises the variation W when the test gateway electric energy meter is connected with the replaced gateway electric energy meter in parallel1The variation W of the electric energy meter at the test gate when the electric energy meter is in the circuit alone2And the variable quantity W when the test gateway electric energy meter is connected with the newly-installed gateway electric energy meter in parallel3。
Further, the calculation formula of the loss electric quantity W during the table changing period is as follows:
W＝W1+W2+W3＝(Ua×Ia2×cosθa+Ub×Ib2×cosθb+Uc×Ic2×cosθc)×t1+(Ua×Ia×cosθa+Ub×Ib×cosθb+Uc×Ic×cosθc)×t2+(Ua×Ia2×cosθa+Ub×Ib2×cosθb+Uc×Ic2×cosθc)×t3。
on the other hand, this application still provides a loss-free electric energy watchband electricity change device of electric quantity, includes: the device is characterized by also comprising a novel combined junction box for the electric energy meter, a test gateway electric energy meter and a new gateway electric energy meter; wherein: the voltage line and the current line are respectively used for connecting a secondary voltage loop and a current loop of the test gateway electric energy meter and the switched gateway electric energy meter; the crocodile clip is used for acquiring the voltage of the electric energy meter at the test gateway; the clamp-on ammeter is used for detecting whether the electric energy meter of the test gateway and the current wiring of the electric energy meter are correct or not; the test gateway electric energy meter is used for recording the loss electric quantity during meter replacement, and the newly-installed gateway electric energy meter is used for replacing the replaced gateway electric energy meter.
Further, the background of the electric energy meter of the test gateway is a known value read in advance or is 0.
Furthermore, the replaced gateway electric energy meter and the test gateway electric energy meter are electric meters with the same specification and the same model, and the test gateway electric energy meter is qualified in verification.
The utility model provides a method and device are changed with electricity to electric energy meter that electric quantity is lossless, through being inserted experimental gate electric energy meter in by operating circuit, the electric quantity loss when can effectively acquire the electric energy meter electrified change, the logic principle is simple, high durability and convenient operation, the on-the-spot practicality is strong, the measurement accuracy does not receive the influence of load fluctuation and meter changing time length, can avoid the loss of electric quantity during electrified meter changing completely, the fair of electric power trade, just and both sides' economic interests have effectively been ensured.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. The foregoing description is that of the preferred embodiment of the invention only, and is not intended to limit the invention in any way. The present invention can be practiced in many ways other than those specifically described herein and is therefore not limited to the specific implementations disclosed above. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (6)
1. A method for electrically replacing an electric energy meter without electric quantity loss is characterized by comprising the following steps:
sequentially and correspondingly connecting voltage terminals of the test gateway electric energy meter in parallel to a voltage loop of the switched gateway electric energy meter;
sequentially and correspondingly connecting the current terminals of the test gateway electric energy meter to the current circuit of the switched gateway electric energy meter in series according to the phase sequence, and forming a parallel relation with the current circuit of the switched gateway electric energy meter;
sequentially removing the current terminal connection of the switched gateway electric energy meter to obtain a circuit section current line interface;
recording the bottom electricity quantity of the electric energy meter of the switched gateway;
sequentially removing the voltage terminal connection of the switched electric energy meter according to the phase sequence to obtain a circuit section voltage line interface;
sequentially connecting the voltage line interface of the circuit end to a voltage terminal of the electric energy meter of a new gateway;
sequentially connecting the current line interface at the circuit end into the current terminal of the electric energy meter at the new installation gateway through a novel combined junction box for the electric energy meter according to the phase sequence, and forming a parallel connection relation with the current circuit of the electric energy meter at the test gateway;
sequentially removing the current terminal connection wires of the electric energy meter at the test gateway;
recording the variation of the bottom electricity quantity of the electric energy meter of the test gateway;
sequentially removing the voltage terminal connection wires of the electric energy meter at the test gate;
forming feedback data by the recorded bottom electricity quantity of the electric energy meter of the switched gateway and the bottom electricity quantity variable quantity of the electric energy meter of the test gateway;
and finishing meter replacement after confirming that the electric energy meter of the new gateway works normally.
2. The method for replacing the electric energy meter with no electric quantity loss according to claim 1, wherein the variation of the electric quantity at the bottom of the electric energy meter at the test gateway is the electric quantity loss W during meter replacement; the loss electric quantity W during meter replacement comprises the variation W when the test gateway electric energy meter is connected with the replaced gateway electric energy meter in parallel1The variation W of the electric energy meter at the test gate when the electric energy meter is in the circuit alone2And the variable quantity W when the test gateway electric energy meter is connected with the newly-installed gateway electric energy meter in parallel3。
3. The method for replacing the electric energy meter with no electric energy loss according to claim 2, wherein the electric energy loss W during the meter replacing is calculated by the following formula:
W＝W1+W2+W3＝(Ua×Ia2×cosθa+Ub×Ib2×cosθb+Uc×Ic2×cosθc)×t1+(Ua×Ia×cosθa+Ub×Ib×cosθb+Uc×Ic×cosθc)×t2+(Ua×Ia2×cosθa+Ub×Ib2×cosθb+Uc×Ic2×cosθc)×t3；
wherein: ua, Ub and Uc are the internal voltage of the electric energy meter of the switched gateway; i isa. Ib and Ic are internal currents of the switched electric energy meter; t is t1The time when the test gateway electric energy meter is connected with the switched gateway electric energy meter in parallel is used; t is t2Is the time of the electric energy meter of the test gateway in the circuit alone; t is t3And the time for connecting the electric energy meter at the test gateway and the electric energy meter at the newly-installed gateway in parallel is used.
4. A loss-less watchband electricity replacing device applied to the loss-less watchband electricity replacing method according to any one of claims 1 to 3, comprising: the device is characterized by also comprising a novel combined junction box for the electric energy meter, a test gateway electric energy meter and a new gateway electric energy meter; wherein: the voltage line and the current line are respectively used for connecting a secondary voltage loop and a current loop of the test gateway electric energy meter and the switched gateway electric energy meter; the crocodile clip is used for acquiring the voltage of the electric energy meter at the test gateway; the clamp-on ammeter is used for detecting whether the electric energy meter of the test gateway and the current wiring of the electric energy meter are correct or not; the test gateway electric energy meter is used for recording the loss electric quantity during meter replacement, and the newly-installed gateway electric energy meter is used for replacing the replaced gateway electric energy meter.
5. The device for replacing the electric energy meter band without loss of electric quantity as claimed in claim 4, wherein the base degree of the electric energy meter at the test gateway is a known value.
6. The device for replacing the electric energy meter with the watch band without electric energy loss according to claim 4, wherein the replaced gateway electric energy meter and the test gateway electric energy meter are the same specification and the same model electric energy meters.
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| CN115754397A (en) * | 2022-10-31 | 2023-03-07 | 云南电网有限责任公司昆明供电局 | Multifunctional testing system and method for seamlessly connecting high-precision calculation of electric quantity |
| CN115754397B (en) * | 2022-10-31 | 2023-12-05 | 云南电网有限责任公司昆明供电局 | Multifunctional testing system and method for seamless connection high-precision electric quantity calculation |
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