Two-way metering system of 10kV power transmission line

Abstract

The invention relates to a two-way metering system of a 10kV power transmission line, which comprises a first transformer and a second transformer, a power transmission line is arranged between the 10kV side of the first transformer and the 10kV side of the second transformer, and an interconnection switch is arranged on the power transmission line. The metering box is connected with the current transformer, the FTU is connected with the metering box, and the FTU is connected with the current transformer.

Description

Technical Field

[0001] The invention relates to a bidirectional metering system for a 10kV power transmission line. Background Art

[0002] Nowadays, with the pace of urban distribution network transformation accelerating, ring main unit has become an important configuration of 10kV distribution network in various cities, such as the outgoing line nodes from the main feeder line to each substation, the contact switch nodes between feeders, etc. are all in the ring main unit. The main features of the ring main unit are fully enclosed, fully insulated, and fully shielded. The busbar and the live parts of the high-voltage switch are all enclosed in the gas box, and the cables are enclosed in the cable accessories. Due to the special design and process guarantee of the ring main unit, its volume is greatly reduced. Only the cable room can be opened, and the internal space is very small. For a large number of ring main units that have been put into operation, if the metering is realized according to the traditional technical solution, it is necessary to add another metering cabinet, which is not only bulky and inconsistent with the compact style of the ring main unit, but also may involve civil engineering and land approval issues. The newly added metering cabinet cannot achieve the full enclosed and fully insulated ring main unit, and the on-site installation process requires power outage, which is a large workload. Summary of the invention

[0003] The purpose of the present invention is to provide a bidirectional metering system for a 10kV power transmission line which has a simple structure and is easy to implement.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a bidirectional metering system for a 10kV transmission line, including a first transformer and a second transformer, a transmission line is arranged between the 10kV side of the first transformer and the 10kV side of the second transformer, a connecting switch is arranged on the transmission line, a current transformer is connected in parallel to the transmission lines on both sides of the connecting switch, and also includes a meter box connected to the current transformer, an FTU connected to the meter box, and the FTU is connected to the current transformer.

[0005] The beneficial effects of the present invention are as follows: the metering of both sides of the tie switch in the transmission line is realized by the cooperation of the current transformer, the metering box and the FTU, and the structure is simple and easy to realize.

[0006] The present invention will be described in more detail below with reference to the embodiments. DETAILED DESCRIPTION

[0007] Embodiment, a bidirectional metering system for a 10kV transmission line, comprising a first transformer and a second transformer, a transmission line is arranged between the 10kV side of the first transformer and the 10kV side of the second transformer, a connecting switch is arranged on the transmission line, a current transformer is connected in parallel to the transmission line on both sides of the connecting switch, and also comprises a meter box connected to the current transformer, an FTU connected to the meter box, and the FTU is connected to the current transformer.

[0008] By taking advantage of the primary and secondary integration features of the existing interconnection switch FTU, two-way metering can be achieved by installing one meter.

[0009] Principle: The line loss module inside the FTU uses the line loss module measurement circuit, the meter is connected in parallel with the three-phase voltage, and in series with the Ia and Ic current circuits.

[0010] There are 7 wires in total, and the voltage wires are generally connected to Ua, Ub (Un), and Uc using cable numbers "2, 5, and 8";

[0011] The current lines are generally connected to Ia+- and Ic+- using cable numbers "1, 3, 7, 9".

[0012] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, the term "includes" and any variation thereof are intended to cover non-exclusive inclusions.

[0013] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] The terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "one", "one" and "item" used herein are also intended to include plural numbers. It should also be understood that the terms "include" and / or "comprise" used herein specify the existence of stated features, integers, steps, operations, units and / or components, without excluding the existence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0015] The above is only an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above-mentioned concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A bidirectional metering system for a 10kV transmission line, comprising a first transformer and a second transformer, a transmission line is arranged between the 10kV side of the first transformer and the 10kV side of the second transformer, and a tie switch is arranged on the transmission line, characterized in that: The current transformer is connected in parallel to the transmission lines on both sides of the tie switch, and also includes a meter box connected to the current transformer, an FTU connected to the meter box, and the FTU is connected to the current transformer.