CN104267369B - Solution to separation of single-phase and three-phase electric energy meter compatible verification voltage system - Google Patents
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Abstract
Description
技术领域technical field
本发明属于电学领域，尤其涉及单三相电能表测试领域。The invention belongs to the field of electricity, in particular to the field of testing single-phase and three-phase electric energy meters.
背景技术Background technique
目前电力用户在进行电能表实验室检定时，需要同时配置三相电能表检定装置和单相电能表检定装置，对实验室的空间以及实验室建设费用带来一定的困扰，该方法是针对两种电能表进行集中检定，在一个三相电能表检定装置的基础上实现兼容检定单相电能表，主要解决两种表切换时的兼容性问题。At present, power users need to configure three-phase electric energy meter verification devices and single-phase electric energy meter verification devices at the same time when performing electric energy meter laboratory verification, which brings certain troubles to the laboratory space and laboratory construction costs. This method is aimed at two The centralized verification of two kinds of electric energy meters is carried out, and the compatible verification of single-phase electric energy meters is realized on the basis of a three-phase electric energy meter verification device, which mainly solves the compatibility problem when switching between the two types of electric energy meters.
该方案能够降低对实验室空间的要求，同时减少实验室建设成本。This scheme can reduce the requirements for laboratory space and reduce the cost of laboratory construction at the same time.
发明内容Contents of the invention
实现单三相电能表兼容检定，主要是解决在三相系统中如何实现单相系统的电压分离，同时在分离后在实现单相电能表检定的时候，不影响三相系统的正常工作。The realization of compatible verification of single-phase and three-phase electric energy meters is mainly to solve how to realize the voltage separation of the single-phase system in the three-phase system, and at the same time, when the single-phase electric energy meter is verified after separation, the normal operation of the three-phase system will not be affected.
单三相电能表兼容检定电压系统分离解决方法，包括以下步骤：The solution to the separation of the single-phase three-phase electric energy meter compatible verification voltage system includes the following steps:
A:将三相功率源输出作为唯一的供电源；A: Use the three-phase power source output as the only power supply;
B:先由三相功率源和三相挂表座以及三相标准表形成独立的三相供电系统；B: An independent three-phase power supply system is first formed by a three-phase power source, a three-phase hanging meter holder and a three-phase standard meter;
C:在功率源的A相电压输出UA中加入切换继电器K0；C: Add switching relay K0 to the A-phase voltage output UA of the power source;
D:在功率源的电压输出UN中加入切换继电器K1；D: Add switching relay K1 to the voltage output UN of the power source;
E:在标准表的A相电压输入UA中加入切换继电器K2；E: Add switching relay K2 to the A-phase voltage input UA of the standard meter;
F:在标准表的电压输入UN中加入切换继电器K3；F: Add switching relay K3 to the voltage input UN of the standard meter;
G:将经过切换后的功率源输出接入新增加的隔离PT的一次输入端；G: Connect the output of the switched power source to the primary input of the newly added isolated PT;
H：将隔离PT的二次输出端每一个输出绕组连接入各个表位中；H: Connect each output winding of the secondary output terminal of the isolated PT into each table position;
I：通过切换K0～K3实现单三相电压系统的分离使用。I: Realize the separate use of single-phase and three-phase voltage systems by switching K0~K3.
本发明所述步骤G中对增加的隔离PT要求包括:具备多路输出的特性，同时要能够满足检定装置精度等级所需的要求，按照要求，新增的隔离PT的等级不低于0.1％。The requirements for the added isolation PT in step G of the present invention include: having the characteristics of multi-channel output, and at the same time meeting the requirements required for the accuracy level of the verification device. According to the requirements, the level of the newly added isolation PT is not less than 0.1%. .
本发明所述步骤H中在每个表位要预留独立的单相电压系统接线端子，为单相电压系统的切入提供端口。In the step H of the present invention, an independent single-phase voltage system connection terminal should be reserved for each epitope to provide a port for the cut-in of the single-phase voltage system.
本发明所述步骤I中所使用的电压系统切换继电器K0～K3为单刀双掷继电器，4个继电器的控制能够作为联动控制，也能够进行分别独立控制。The voltage system switching relays K0-K3 used in the step I of the present invention are single-pole double-throw relays, and the control of the four relays can be used as linkage control or independent control.
本发明所述的步骤I通过切换K0～K3实现单三相电压系统的分离的实现方式包括以下步骤：Step 1 of the present invention realizes the separation of single-phase and three-phase voltage systems by switching K0～K3, and the realization method includes the following steps:
E10：K0～K1切换继电器常闭端均连接在三相电压系统中,连接在三相挂表座的A相电压上；E10: K0～K1 switching relay normally closed ends are all connected in the three-phase voltage system, and connected to the A-phase voltage of the three-phase wall meter holder;
E11：K2～K3切换继电器常闭端与K0和K1的常闭端进行连接；E11: K2～K3 switching relay normally closed end is connected with the normally closed end of K0 and K1;
E12：K0～K1切换继电器常开端连接在隔离PT的一次输入端；E12: The normally open end of the K0~K1 switching relay is connected to the primary input end of the isolated PT;
E13：K2～K3切换继电器常开端接入单相电压系统的第一表位的电压端；E13: The normally open end of K2～K3 switching relay is connected to the voltage end of the first position of the single-phase voltage system;
E14：在检定三相电能表时，控制K0～K3的常闭端闭合，实现三相电压供电系统的导通，同时断开单相系统的供电；E14: When verifying the three-phase electric energy meter, control the normally closed terminals of K0~K3 to close, realize the conduction of the three-phase voltage power supply system, and disconnect the power supply of the single-phase system at the same time;
E15：在检定单相电能表时，控制K0～K3的常开端闭合，实现单相电压供电系统的导通，同时断开三相系统的供电；E15: When verifying the single-phase electric energy meter, control the normally open ends of K0~K3 to close, realize the conduction of the single-phase voltage power supply system, and disconnect the power supply of the three-phase system at the same time;
E16：通过E14和E15的步骤来实现单三相电压系统的相互切换。E16: Through the steps of E14 and E15, the mutual switching of single-phase and three-phase voltage systems is realized.
本发明步骤E10～E13确保单相供电系统和三相供电系统能够进行独立的控制，为兼容使用提供可行性支持。Steps E10-E13 of the present invention ensure that the single-phase power supply system and the three-phase power supply system can be independently controlled, and provide feasibility support for compatible use.
本发明的有益效果：该方法通过增加4个继电器以及单相系统中所必须的电压隔离互感器，实现利用同一套功率源和标准表，产生两个独立的供电系统——三相电能表供电系统和单相电能表供电系统。Beneficial effects of the present invention: the method realizes the use of the same set of power source and standard meter by adding 4 relays and the necessary voltage isolation transformer in the single-phase system to generate two independent power supply systems—three-phase electric energy meter power supply system and single-phase energy meter power supply system.
附图说明Description of drawings
图1是本发明中使用的单三相电压系统切换连接图。Fig. 1 is a switching connection diagram of a single-phase three-phase voltage system used in the present invention.
具体实施方式detailed description
单三相电能表兼容检定电压系统分离解决方法，包括以下步骤：The solution to the separation of the single-phase three-phase electric energy meter compatible verification voltage system includes the following steps:
A:将三相功率源输出作为唯一的供电源；A: Use the three-phase power source output as the only power supply;
B:先由三相功率源和三相挂表座以及三相标准表形成独立的三相供电系统；B: An independent three-phase power supply system is first formed by a three-phase power source, a three-phase hanging meter holder and a three-phase standard meter;
C:在功率源的A相电压输出UA中加入切换继电器K0；C: Add switching relay K0 to the A-phase voltage output UA of the power source;
D:在功率源的电压输出UN中加入切换继电器K1；D: Add switching relay K1 to the voltage output UN of the power source;
E:在标准表的A相电压输入UA中加入切换继电器K2；E: Add switching relay K2 to the A-phase voltage input UA of the standard meter;
F:在标准表的电压输入UN中加入切换继电器K3；F: Add switching relay K3 to the voltage input UN of the standard meter;
G:将经过切换后的功率源输出接入新增加的隔离PT的一次输入端；G: Connect the output of the switched power source to the primary input of the newly added isolated PT;
H：将隔离PT的二次输出端每一个输出绕组连接入各个表位中；H: Connect each output winding of the secondary output terminal of the isolated PT into each table position;
I：通过切换K0～K3实现单三相电压系统的分离使用。I: Realize the separate use of single-phase and three-phase voltage systems by switching K0~K3.
本发明所述步骤G中对增加的隔离PT要求包括:具备多路输出的特性，同时要能够满足检定装置精度等级所需的要求，按照要求，新增的隔离PT的等级不低于0.1％。The requirements for the added isolation PT in step G of the present invention include: having the characteristics of multi-channel output, and at the same time meeting the requirements required for the accuracy level of the verification device. According to the requirements, the level of the newly added isolation PT is not less than 0.1%. .
本发明所述步骤H中在每个表位要预留独立的单相电压系统接线端子，为单相电压系统的切入提供端口。In the step H of the present invention, an independent single-phase voltage system connection terminal should be reserved for each epitope to provide a port for the cut-in of the single-phase voltage system.
本发明所述步骤I中所使用的电压系统切换继电器K0～K3为单刀双掷继电器，4个继电器的控制能够作为联动控制，也能够进行分别独立控制。The voltage system switching relays K0-K3 used in the step I of the present invention are single-pole double-throw relays, and the control of the four relays can be used as linkage control or independent control.
本发明所述的步骤I通过切换K0～K3实现单三相电压系统的分离的实现方式包括以下步骤：Step 1 of the present invention realizes the separation of single-phase and three-phase voltage systems by switching K0～K3, and the realization method includes the following steps:
E10：K0～K1切换继电器常闭端均连接在三相电压系统中,连接在三相挂表座的A相电压上；E10: K0～K1 switching relay normally closed ends are all connected in the three-phase voltage system, and connected to the A-phase voltage of the three-phase wall meter holder;
E11：K2～K3切换继电器常闭端与K0和K1的常闭端进行连接；E11: K2～K3 switching relay normally closed end is connected with the normally closed end of K0 and K1;
E12：K0～K1切换继电器常开端连接在隔离PT的一次输入端；E12: The normally open end of the K0~K1 switching relay is connected to the primary input end of the isolated PT;
E13：K2～K3切换继电器常开端接入单相电压系统的第一表位的电压端；E13: The normally open end of K2～K3 switching relay is connected to the voltage end of the first position of the single-phase voltage system;
E14：在检定三相电能表时，控制K0～K3的常闭端闭合，实现三相电压供电系统的导通，同时断开单相系统的供电；E14: When verifying the three-phase electric energy meter, control the normally closed terminals of K0~K3 to close, realize the conduction of the three-phase voltage power supply system, and disconnect the power supply of the single-phase system at the same time;
E15：在检定单相电能表时，控制K0～K3的常开端闭合，实现单相电压供电系统的导通，同时断开三相系统的供电；E15: When verifying the single-phase electric energy meter, control the normally open ends of K0~K3 to close, realize the conduction of the single-phase voltage power supply system, and disconnect the power supply of the three-phase system at the same time;
E16：通过E14和E15的步骤来实现单三相电压系统的相互切换。E16: Through the steps of E14 and E15, the mutual switching of single-phase and three-phase voltage systems is realized.
本发明步骤E10～E13确保单相供电系统和三相供电系统能够进行独立的控制，为兼容使用提供可行性支持。Steps E10-E13 of the present invention ensure that the single-phase power supply system and the three-phase power supply system can be independently controlled, and provide feasibility support for compatible use.
附图1为电压系统分离的原理框图，通过增加4个单刀双掷继电器实现从三相系统中分离出单相电压系统，同时在每个表位将单相电压接口与三相电压接口进行物理隔离，通过控制继电器实现两个电源系统的有效隔离切换。Attached Figure 1 is the principle block diagram of voltage system separation. By adding 4 SPDT relays, the single-phase voltage system is separated from the three-phase system, and at the same time, the single-phase voltage interface and the three-phase voltage interface are physically separated at each table Isolation, the effective isolation switching of two power supply systems is realized by controlling the relay.
在进行三相电能表检定时，增加的4个继电器都处于常闭端连接状态，此时三相功率源电压A相直接通过继电器K0和K1的常闭端进入每个表位的三相挂表座上，另外两相直接进入每个表位的三相挂表座，实现三相电能表的电压供电要求；同时标准表的采样电压端通过K2/K3以及直连线路，实现对功率源输出的监测。During the verification of the three-phase electric energy meter, the 4 additional relays are all connected to the normally closed terminals. At this time, the phase A of the three-phase power source voltage directly enters the three-phase connected terminals of each meter position through the normally closed terminals of the relays K0 and K1. On the meter base, the other two phases directly enter the three-phase hanging meter base of each meter position to meet the voltage supply requirements of the three-phase electric energy meter; at the same time, the sampling voltage terminal of the standard meter passes through K2/K3 and the direct connection line to realize the power source output monitoring.
在进行单相电能表检定时，增加的4个继电器切换到常开端连接状态，在检定单相时功率源控制A相电压输出，另外两相控制关闭。由于K0和K1处于常开端连接状态，A相电压通过继电器常开端进入隔离PT，同时切断三相电压端子的电压信号，实现对单相系统隔离供电的目的；同时标准表通过K2和K3继电器切换到隔离PT的次级端(第一表位单相电压端)，进而实现对单相供电系统的监测。When performing single-phase watt-hour meter verification, the added 4 relays are switched to the normally open connection state. When verifying single-phase, the power source controls the voltage output of phase A, and the other two phases are controlled to be closed. Since K0 and K1 are in the normally open connection state, the A-phase voltage enters the isolation PT through the normally open end of the relay, and at the same time cuts off the voltage signal of the three-phase voltage terminal to realize the purpose of isolated power supply for the single-phase system; at the same time, the standard meter is switched through the K2 and K3 relays To the secondary end of the isolation PT (the first table is the single-phase voltage end), and then realize the monitoring of the single-phase power supply system.
通过在同一个试验装置中，实现单相电子式电能表与三相电子式电能表供电系统的兼容检定；解决单三相电能表兼容检定时，如何实现两个系统供电电压的自由切换；通过本发明的描述，使用本方法后，能够节省一套功率源和标准表，降低实验室建设成本；同时为兼容式电能表检定装置的实现提供有力的支持。Through the same test device, realize the compatibility verification of the single-phase electronic energy meter and the three-phase electronic energy meter power supply system; solve the problem of how to realize the free switching of the power supply voltage of the two systems during the compatibility verification of the single-phase and three-phase electronic energy meters; through According to the description of the invention, after using the method, a set of power sources and standard meters can be saved, and the cost of laboratory construction can be reduced; at the same time, powerful support can be provided for the realization of a compatible electric energy meter verification device.
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| CN105487041A (en) * | 2015-12-28 | 2016-04-13 | 云南电网有限责任公司电力科学研究院 | A performance detection system for electric energy metering equipment |
| CN106199486A (en) * | 2016-06-27 | 2016-12-07 | 山东省计量科学研究院 | A kind of measurement system of power meter temperature impact test |
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