CN211958551U - Ring main unit with built-in ECT and EVT - Google Patents

Abstract

The utility model discloses a looped netowrk cabinet of built-in ECT and EVT, the looped netowrk cabinet of built-in ECT and EVT includes the cabinet body, and the bottom of expanding the generating line is connected the generating line in order can dismantle and is drawn forth the end, and the generating line is drawn forth the lower extreme of end and is passed through copper sheet electric connection copper bar, and the left side end of copper bar passes through bolt fixed connection EVT, and the other end fixed connection of EVT is on the left side wall of looped netowrk cabinet, and the right side end of copper bar passes through. The utility model adopts the built-in electronic voltage transformer to provide Ua, Ub, Uc and UO voltage signals, the built-in electronic current transformer provides Ia, Ib, Ic and Io current signals, and the external 1 single-phase voltage transformers are arranged, and the voltage signals for the circuit are taken from the single-phase voltage transformers; the device has the capability of collecting three-phase current, three-phase voltage, zero-sequence current and zero-sequence voltage, and meets the functions of calculating active power, reactive power, power factor and frequency and measuring electric energy.

Description

Ring main unit with built-in ECT and EVT

Technical Field

The utility model belongs to the technical field of the looped netowrk cabinet, concretely relates to looped netowrk cabinet of built-in ECT and EVT.

Background

The ring main unit is a group of electric equipment which is arranged in a metal or nonmetal insulating cabinet body or is made into an assembled interval ring main power supply unit, the core part of the ring main unit adopts a load switch and a fuse, the ring main unit has the advantages of simple structure, small volume, low price, capability of improving power supply parameters and performance, power supply safety and the like, and is widely used in distribution stations and box-type substations of load centers of urban residential districts, high-rise buildings, large public buildings, factory enterprises and the like. The conventional ring main unit adopts an electromagnetic current transformer, and the electromagnetic current transformer has high insulation requirement, large size, heavy weight and high price; the dynamic range is small, and the mutual inductor has a saturation phenomenon; ferromagnetic resonance is easy to generate; the equipment is inconvenient to install and maintain; the conventional phase voltage and zero sequence voltage acquisition is realized by additionally arranging a three-phase five-column voltage transformer, and the three-phase five-column voltage transformer has the problems of complex insulation, large volume, narrow measurement linear range, serious electromagnetic interference, easy occurrence of ferromagnetic resonance and the like, thereby seriously restricting the automatic construction of a power distribution network.

Disclosure of Invention

(1) Technical scheme

In order to overcome the defects of the prior art, the utility model provides a looped netowrk cabinet with built-in ECT and EVT, which comprises a cabinet body, wherein a cable chamber, a mechanism chamber, an instrument chamber and a bus chamber are arranged in the cabinet body, a top fixed connection extended bus of the bus chamber is provided, a control handle is led out from the upper part in the mechanism chamber, the bottom of the extended bus is connected with a bus leading-out end in a detachable mode, the lower end of the bus leading-out end is electrically connected with a copper bar through a copper sheet, the left side end of the copper bar is fixedly connected with the EVT through a bolt, the other end of the EVT is fixedly connected on the left side wall surface of the looped netowrk cabinet, the right side end of the copper bar is fixedly connected with the ECT through a bolt, the right side end of the ECT is electrically connected with a cable head, the inner bottom surface of the instrument, the left side of computer is equipped with the divide-shut brake clamp plate, the below of computer sets up the ampere meter, the right side of ampere meter is equipped with rather than side by side atmospheric control ware, the ampere meter with atmospheric control ware's below one side is equipped with energy storage pilot lamp, combined floodgate pilot lamp and the separating brake pilot lamp that is the straight line and arranges, and the energy storage pilot lamp combined floodgate pilot lamp with the below of separating brake pilot lamp is equipped with rather than corresponding energy storage button, combined floodgate button and separating brake button respectively.

Furthermore, a barometer is arranged on the rear side inside the mechanism chamber, and a fault display is arranged below the barometer.

Furthermore, a primary analog line is arranged on the upper side inside the mechanism chamber and is electrically connected with the isolating switch and the grounding switch.

The design principle of the utility model is as follows: pass through bolt fixed connection EVT at the left side end of copper bar, electronic voltage transformer contains the little iron core of underload: the frequency response range is wide, the measurement range is wide, the linearity is good, the anti-interference capability is strong, the size is small, and the weight is light; epoxy resin pouring: safety, environmental protection and maintenance free; and (3) analog voltage signal output: the requirements of secondary equipment such as metering, measurement and protection can be met simultaneously. The EVT is combined with a common single-phase voltage transformer to obtain zero sequence voltage and phase voltage, and the single-phase voltage transformer has the characteristics of small volume and convenience in installation. The right side end of the copper bar is fixedly connected with the ECT through the bolt, the right side end of the ECT is electrically connected with the cable head, and the small signal output of the ECT electronic current transformer is directly connected into secondary equipment without secondary conversion, so that the ECT electronic current transformer can be widely used for metering, measuring and protecting three-phase current and zero-sequence current as a substitute product of the traditional electromagnetic current transformer.

(2) Advantageous effects

The utility model has the advantages that: the utility model adopts the built-in electronic voltage transformer to provide Ua, Ub, Uc and UO voltage signals, the built-in electronic current transformer provides Ia, Ib, Ic and Io current signals, and the external 1 single-phase voltage transformers are arranged, and the voltage signals for the circuit are taken from the single-phase voltage transformers; the device has the capability of collecting three-phase current, three-phase voltage, zero-sequence current and zero-sequence voltage, and meets the functions of calculating active power, reactive power, power factor and frequency and measuring electric energy.

Drawings

Fig. 1 is an internal structure view of a ring main unit with built-in ECT and EVT;

fig. 2 is a front wall structure diagram of the ring main unit with built-in ECT and EVT.

Detailed Description

The present invention will be further described with reference to the following examples.

Example one

As shown in fig. 1-2, the present embodiment provides a ring main unit with ECT and EVT built in, the ring main unit with ECT and EVT built in includes a main unit body, a cable chamber 1, a mechanism chamber 2, an instrument chamber 3 and a bus chamber 4 are arranged inside the main unit body, the top of the bus chamber 4 is fixedly connected with an expanded bus 41, a control handle 21 is led out from the upper inside of the mechanism chamber 2, the bottom of the expanded bus 41 is detachably connected with a bus lead-out end 42, the lower end of the bus lead-out end 42 is electrically connected with a copper bar 43 through a copper sheet, the left end of the copper bar 43 is fixedly connected with an EVT5 through a bolt, the other end of the EVT5 is fixedly connected to the left side wall surface of the ring main unit, the right side of the copper bar 43 is fixedly connected with an ECT6 through a bolt, the right side of the ECT6 is electrically connected with a cable head 7, the inner bottom surface of the instrument chamber 3 is provided with a transfer switch 31, the left side of microcomputer 32 is equipped with divide-shut brake clamp plate 33, the below of microcomputer 32 sets up ampere meter 34, the right side of ampere meter 34 is equipped with rather than the atmospheric control ware 35 side by side, ampere meter 34 with below one side of atmospheric control ware 35 is equipped with energy storage pilot lamp 36, closing indicator lamp 37 and the separating brake pilot lamp 38 that are the straight line and arrange, and energy storage pilot lamp 36 closing indicator lamp 37 with the below of separating brake pilot lamp 38 is equipped with rather than corresponding energy storage button 361, closing button 371 and separating brake button 381 respectively.

In this embodiment, a barometer 8 is arranged at the rear side of the inside of the mechanism chamber 2, a fault display 81 is arranged below the barometer 8, a primary analog line 9 is arranged at the upper side of the inside of the mechanism chamber 2, and the primary analog line 9 is electrically connected with an isolating switch 91 and a grounding switch 92. In the embodiment, the left end of the copper bar 43 is fixedly connected with an EVT5 through a bolt, and the electronic voltage transformer EVT comprises a light-load small iron core: the frequency response range is wide, the measurement range is wide, the linearity is good, the anti-interference capability is strong, the size is small, and the weight is light; epoxy resin pouring: safety, environmental protection and maintenance free; and (3) analog voltage signal output: the requirements of secondary equipment such as metering, measurement and protection can be met simultaneously. The EVT is combined with a common single-phase voltage transformer to obtain zero sequence voltage and phase voltage, and the single-phase voltage transformer has the characteristics of small volume and convenience in installation. The right end of the copper bar 43 is fixedly connected with the ECT6 through a bolt, the right end of the ECT6 is electrically connected with the cable head 7, and the small signal output of the ECT electronic current transformer is directly connected to secondary equipment without secondary conversion, so that the ECT electronic current transformer can be widely used for metering, measuring and protecting three-phase current and zero-sequence current as a substitute product of the traditional electromagnetic current transformer.

The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, modifications and substitutions can be made, which are all within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (3)

1. The ring main unit with the built-in ECT and EVT comprises a main body, wherein a cable chamber (1), a mechanism chamber (2), an instrument chamber (3) and a bus chamber (4) are arranged inside the main body, and is characterized in that an expanded bus (41) is fixedly connected to the top of the bus chamber (4), a control handle (21) is led out from the upper part inside the mechanism chamber (2), the bottom of the expanded bus (41) is detachably connected with a bus leading-out end (42), the lower end of the bus leading-out end (42) is electrically connected with a copper bar (43) through a copper sheet, the left end of the copper bar (43) is fixedly connected with the EVT (5) through a bolt, the other end of the EVT (5) is fixedly connected to the left side wall surface of the ring main unit, the right end of the copper bar (43) is fixedly connected with an ECT (6) through a bolt, and the right end of the ECT (6) is electrically connected with, the inside bottom surface of instrument room (3) sets up change over switch (31), the positive wall right side top of instrument room (3) is equipped with computer (32), the left side of computer (32) is equipped with divide-shut brake clamp plate (33), the below of computer (32) sets up ampere meter (34), the right side of ampere meter (34) is equipped with rather than temperature and humidity controller (35) side by side, ampere meter (34) with below one side of temperature and humidity controller (35) is equipped with energy storage pilot lamp (36), closing indicator lamp (37) and separating brake pilot lamp (38) that are the straight line and arrange, and energy storage pilot lamp (36), closing indicator lamp (37) with the below of separating brake pilot lamp (38) is equipped with rather than corresponding energy storage button (361), closing button (371) and separating brake button (381) respectively.

2. The ring main unit with built-in ECT and EVT of claim 1, wherein: the mechanism is characterized in that a barometer (8) is arranged on the rear side inside the mechanism chamber (2), and a fault display (81) is arranged below the barometer (8).

3. The ring main unit with built-in ECT and EVT of claim 1, wherein: the upper side of the inside of the mechanism chamber (2) is provided with a primary simulation line (9), and the primary simulation line (9) is electrically connected with the isolating switch (91) and the grounding switch (92).

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