Digital primary and secondary fusion pole-mounted circuit breaker

Abstract

The utility model relates to a digital primary and secondary fusion pole-mounted circuit breaker, which comprises a base, three pole columns are arranged on the base, an electrical component is arranged in the base, an insulating sleeve is arranged on the outer surface of each pole column, an electronic combined mutual inductor is arranged on one side of each pole column, and the electronic combined mutual inductor is arranged on the other side of each pole column. The electronic combined mutual inductor is used for collecting phase voltage, phase current, zero sequence voltage and zero sequence current of a corresponding pole, the electronic combined mutual inductor is connected with the base through a cable, one side of the base is provided with an ADMU module, the ADMU module is used for converting data collected by the electronic combined mutual inductor into word signals, the base is provided with a communication interface, and the communication interface is connected with the base. The communication interface is used for communication connection between the ADMU and the FTU; according to the utility model, the integrated design is adopted, the workload and difficulty of on-site installation are reduced, the installation can be completed by one support and one-time hoisting, one-time wiring is greatly simplified, and the dependence on line power failure is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, concretely is a kind of digital primary and secondary fusion pole-mounted circuit breaker. BACKGROUND

[0002] At present, various primary and secondary fusion integrated pole-mounted circuit breakers are widely used in urban and rural power distribution stations. With the continuous improvement of substation network equipment automation, the current and voltage transformer as the source equipment of low-voltage side data processing system, the accuracy of its measurement results and the reliability of the obtained results affect the stable, economic, safe and effective operation of the power grid network. However, the electromagnetic and electronic combined transformer has the characteristics of technical principle, and cannot meet the requirements of stable, economic, safe and effective operation of the power grid. This not only is not conducive to the stable and safe operation of the primary and secondary integrated pole-mounted circuit breaker, but also seriously threatens the safe operation of high-voltage power supply.

[0003] The characteristics of the traditional electromagnetic current transformer are: 1. The primary coil is connected in series in the circuit, and the number of turns is very small, so the current in the primary coil depends entirely on the load current of the measured circuit and is independent of the secondary current; 2. The impedance of the current coil of the instrument and relay connected to the secondary coil of the current transformer is very small, so under normal circumstances, the current transformer operates in a nearly short-circuit state.

[0004] For a long time, in current measurement and relay protection, the traditional electromagnetic current transformer with a core occupies a dominant position. However, its internal structure contains a core, which makes the traditional electromagnetic current transformer have the following irremediable shortcomings:

[0005] 1. When the potential of the high-voltage bus is very high, the insulation requirement for the sensing coil is very high. This makes the volume of the sensing coil very large, and the production cost also becomes very high accordingly;

[0006] 2. The sensing coil is prone to ferromagnetic resonance;

[0007] 3. During operation, the electromagnetic current transformer generates a large amount of heat, which is not easy to dissipate, thus causing problems such as flammability and explosiveness;

[0008] 4. Due to the presence of the core, when the high-voltage bus passes a large current, the sensing coil is subject to ferromagnetic saturation, resulting in measurement errors and easy damage to the equipment. SUMMARY

[0009] The purpose of the utility model is to solve the above-mentioned problems of the prior art, and to provide a digital primary and secondary fusion pole-mounted circuit breaker.

[0010] The utility model discloses a specific scheme is: a kind of digital primary-secondary fusion pole circuit breaker, including base, three pole posts are loaded on base, electrical component is loaded in base, the outer surface of each pole post is equipped with insulating sleeve, the side of each pole post is equipped with electronic combined mutual inductor, electronic combined mutual inductor is used to gather corresponding pole post's phase voltage, phase current and zero sequence voltage, zero sequence current, electronic combined mutual inductor is connected with base by cable, one side of base is equipped with ADMU module, ADMU module is used to convert the data collected by electronic combined mutual inductor into word signal, base is equipped with communication interface, communication interface is used for ADMU and FTU communication connection.

[0011] Further, the electronic combined mutual inductor is fixed in the insulating sleeve, a silver-plated copper conducting rod is arranged at the upper end of the insulating sleeve, one end of the silver-plated copper conducting rod is connected with the pole post, the other end of the silver-plated copper conducting rod extends out of the insulating sleeve and is connected with a copper sheet, and the copper sheet is connected and fastened with the silver-plated copper conducting rod through a hoop connecting piece.

[0012] Further, the base is provided with a support corresponding to the bottom end of each electronic combined mutual inductor on one side, one end of the support is fixedly connected with the base, and each electronic combined mutual inductor is mounted on the corresponding support.

[0013] Further, the base is provided with a gland corresponding to the connection position of the cable to play a waterproof role.

[0014] Further, the communication interface adopts a sailing plug interface.

[0015] The utility model has the following beneficial effects: integrated design is adopted, the workload and difficulty of on-site installation are reduced, a pair of supports can complete installation through one-time hoisting, one-time wiring is also greatly simplified, and the dependence on line power-off is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the utility model;

[0017] Figure 2 is Figure 1 a bottom view;

[0018] Figure 3 is Figure 1 a left view;

[0019] Figure 4 is Figure 3 an enlarged view of V of

[0020] Figure 5 is a schematic view of the internal structure of the electronic combined mutual inductor of the utility model;

[0021] Figure 6 is a circuit schematic view of the electronic combined mutual inductor of the utility model;

[0022] In the figure: 1, base; 2, electronic combined mutual inductor; 3, support; 4, cable; 5, gland; 6, ADMU module; 7, locking screw; 8, clamp connector; 9, silver-plated copper conducting rod; 10, copper sheet; 11, high-voltage resistor; 12, low-voltage resistor; 13, current transformer. DETAILED DESCRIPTION

[0023] Referring to Figures 1-5 , the embodiment is a kind of digital primary and secondary fusion pole-mounted circuit breaker, including base 1, three pole columns are installed on base 1, electrical components are installed in base 1, each pole column is provided with an insulating sleeve on the outer surface, each pole column is provided with electronic combined mutual inductor 2 on one side, electronic combined mutual inductor 2 is used to collect corresponding pole column phase voltage, phase current and zero sequence voltage, zero sequence current, electronic combined mutual inductor 2 is connected with base 1 through cable 4, one side of base 1 is provided with ADMU module 6, ADMU module 6 is used to convert the data collected by electronic combined mutual inductor 2 into digital signal, base 1 is provided with communication interface, communication interface is used for ADMU and FTU communication connection.

[0024] The embodiment is communicated between ADMU module 6 and FTU module through 8-10 meters of cable, and digital signal transmission is adopted.

[0025] Further, the electronic combined mutual inductor is fixed in the insulating sleeve, a silver-plated copper conducting rod 9 is installed in the upper end of the insulating sleeve, one end of the silver-plated copper conducting rod 9 is connected with the pole column, the other end of the silver-plated copper conducting rod 9 extends out of the insulating sleeve and is connected with a copper sheet 10, the copper sheet 10 is connected and fastened with the silver-plated copper conducting rod 9 through the clamp connector 8.

[0026] Further, the base 1 is provided with a support 3 corresponding to the bottom end of each electronic combined mutual inductor 2 on one side, one end of the support 3 is fixedly connected with the base 1, and each electronic combined mutual inductor 2 is installed on the corresponding support 3.

[0027] Further, the base 1 is provided with a gland 5 corresponding to the connection of the cable 4 to play a waterproof role.

[0028] Further, the communication interface adopts aviation plug interface.

[0029] The electronic combined mutual inductor 2 in the embodiment mainly includes a current transformer 13 surrounding the silver-plated copper conducting rod 9, a high-voltage resistor 11 and two low-voltage resistors 12, the high-voltage resistor 11 is connected in series with one of the low-voltage resistors 12 and the copper sheet 10, the other low-voltage resistor 12 is connected with the current transformer 13, and two paths are connected to the ADMU module 6 through aviation plug.

[0030] Referring to Figure 6The utility model adopts electronic combined mutual inductor 2 respectively adopts resistance voltage division and electromagnetic induction mode to carry out voltage and current measurement, mainly includes three only independent electronic combined mutual inductor 2, realizes three -phase voltage current and zero sequence voltage, current measurement function through the post level matching live pluggable electronic combined mutual inductor digitization merging unit (abbreviation ADMU).

[0031] The secondary output is analog small signal, can cooperate with ADMU and carry out digital processing on the spot, reduces the error introduced in the long distance transmission process of analog small signal, improves the stability and accuracy of the whole system.

[0032] Adopt shielding twisted pair to carry out transmission digital quantity signal, and have the advantages such as strong anti -interference ability, small, light in weight, low in power consumption.

Claims

1. A digital primary and secondary fused pole-mounted circuit breaker, characterized by: The base is provided with three pole columns, and the base is internally provided with electrical components.

2. A digital class 1 and 2 pole circuit breaker according to claim 1, characterized in that: The electronic combined mutual inductor is fixed in the insulating sleeve, a silver-plated copper conducting rod is arranged at the upper end of the insulating sleeve, one end of the silver-plated copper conducting rod is connected with the pole column, the other end of the silver-plated copper conducting rod extends out of the insulating sleeve and is connected with a copper sheet, and the copper sheet is connected and fastened with the silver-plated copper conducting rod through a hoop connecting piece.

3. A digital class 1 and 2 pole circuit breaker according to claim 1, characterized in that: A support is arranged at the bottom end of each electronic combined mutual inductor on one side of the base.

4. A digital class 1 and 2 pole circuit breaker according to claim 1, characterized in that: A gland is arranged at the connection position of the cable on the base to prevent water.

5. A digital class 1 and 2 pole circuit breaker according to claim 1, characterized in that: The communication interface adopts a sailing plug interface.

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