阅读说明：本技术 移动式多功能接地装置测试系统 (Mobile multifunctional grounding device test system ) 是由 若尔玛余胜 于 2018-06-07 设计创作，主要内容包括：本发明公开了移动式多功能接地装置测试系统,包括控制模块和连接在控制模块上的调压模块、直流模块、交流模块；该系统在工作状态下,根据测试工作需要可注入接地网的为工频电流信号或直流电流信号,抗干扰能力强、测量精度高,且为大电流测试,能实现均匀、不均匀土壤电阻率等复杂地质结构地区,接地电阻、地表电位梯度、接触电位差、跨步电压差等接地参数的准确测试。本发明的优点是：产生的工频大电流,具有较高的测量信噪比,流过地表载流深度较深,更接近实际的系统短路电流流入地网的情况；可以产生百安级的直流大电流,对地中杂散电流具有较高的测量信噪比。(The invention discloses a mobile multifunctional grounding device test system, which comprises a control module, and a voltage regulating module, a direct current module and an alternating current module which are connected to the control module; the system can be injected into a power frequency current signal or a direct current signal of the grounding grid according to the test work requirement in a working state, has strong anti-interference capability and high measurement precision, is a heavy current test, and can realize accurate test of grounding parameters such as grounding resistance, earth surface potential gradient, contact potential difference, step voltage difference and the like in areas with complex geological structures such as uniform and nonuniform soil resistivity. The invention has the advantages that: the generated power frequency heavy current has higher measurement signal-to-noise ratio, and the depth of the current carried by the current flowing through the earth surface is deeper, which is closer to the actual condition that the system short-circuit current flows into the earth screen; the device can generate a large DC current of a hundred amperes level, and has a high measurement signal-to-noise ratio on stray current in the ground.)

1. the mobile multifunctional grounding device test system is characterized by comprising a control module, and a voltage regulating module and a direct current module which are connected to the control module; the pressure regulating module, the direct current module and the alternating current module are integrally installed in the container;

a control module: receiving an external signal to control the voltage regulating module and the direct current module;

The voltage regulating module: the three-phase 380V and 50Hz alternating current is output to the direct current module after being regulated according to the control of the control module

A direct current module: the direct current module comprises a rectification module and a filtering module, the filtering module consists of two filtering groups which are connected in parallel, each filtering group consists of 3 RC filtering units which are connected in series, and each RC filtering unit consists of a resistor and a polar capacitor which are connected in parallel;

The rectification module comprises a three-phase full-bridge rectifier transformer, a rectification controller and a voltage adjusting circuit, and the rectification controller is integrated on the control module; the output range of the rectifying module is that the output direct current voltage is 0-800V, and the output direct current is 280A.

2. the mobile multi-functional grounding device testing system of claim 1, further comprising a 3-2 transformer connected to the voltage regulation module.

3. The mobile multi-functional grounding device testing system of claim 2, wherein the transformation controller of the 3-2 transformer is integrated on a control module.

4. the mobile multifunctional grounding device testing system of claim 3, wherein the output range of the 3-2 transformer is maximum two-phase AC output 800V, current 312A.

Technical Field

the invention relates to the field of grounding parameter measurement of overvoltage and grounding technology, in particular to a mobile multifunctional grounding device test system.

Background

The grounding device is also called a grounding integrated device: and a device for electrically connecting the electrical equipment or other objects with the ground. (construction electric construction technology). The grounding device consists of a grounding electrode (plate), a grounding bus (indoor and outdoor), a grounding down lead (grounding jumper) and a framework grounding. It is used for the purpose of connecting an electrical system to the ground. The metal object which is in direct contact with the ground to realize electrical connection is a grounding electrode. It can be an artificial grounding electrode or a natural grounding electrode. The grounding electrode can be given some kind of electrical function, such as system grounding, protection grounding or signal grounding. The grounding busbar is a reference potential point of the electrical device of the building, and the part needing grounding in the electrical device is connected with the grounding electrode through the grounding busbar. It also serves the function of interconnecting equipotential bonding lines within an electrical installation, thereby achieving total equipotential bonding between major conductive parts within a building. The connecting line between the grounding electrode and the grounding busbar is called a grounding electrode lead.

When a large-current measuring device is grounded, the interference of stray current of a ground grid is difficult to eliminate when the grounding resistance is measured by a traditional power frequency current method, and a needed current booster is large and heavy, a test cable is thick and heavy, field wiring is difficult, and a large amount of manpower and material resources are consumed.

Disclosure of Invention

The technical problems to be solved by the invention are that when a large-current grounding device is grounded, the interference of stray current of a ground grid is difficult to eliminate when the grounding resistance is measured by using a traditional power frequency current method, a needed current booster is large and heavy, a test cable is thick and heavy, field wiring is difficult, and a large amount of manpower and material resources are consumed.

The invention is realized by the following technical scheme:

The mobile multifunctional grounding device test system comprises a control module, and a voltage regulating module and a direct current module which are connected to the control module;

A control module: receiving an external signal to control the voltage regulating module and the direct current module;

The voltage regulating module: the three-phase 380V and 50Hz alternating current is output to the direct current module after being regulated according to the control of the control module

A direct current module: and rectifying and transforming the current output by the voltage regulating module according to the control of the control module. The mode that this scheme adopted direct current module to carry out the rectification after the voltage regulating module carries out the pressure regulating replaces traditional booster and realizes the ground test of heavy current, and the degree of difficulty of site operation has been reduced to the volume of the equipment that reduces.

the direct current module comprises a rectifying module and a filtering module. The rectification module is used for converting alternating current into direct current, and a filtering module is connected behind the rectification module, so that ripples under rated current can be reduced, the test current has higher measurement signal-to-noise ratio to stray current in the ground, and the measurement work of key parameters such as direct current grounding resistance, grounding electrode circuit direct current resistance, grounding electrode ground potential distribution, feed cable shunting, grounding electrode step potential difference, electrode address equipment contact potential difference and the like can be effectively completed.

The rectification module comprises a three-phase full-bridge rectifier transformer, a rectification controller and a voltage adjusting circuit, and the rectification controller is integrated on the control module.

The output range of the rectifying module is that the output direct current voltage is 0-800V, and the output direct current is 280A.

the filtering module consists of two filtering groups which are connected in parallel, each filtering group consists of 3 RC filtering units which are connected in series, and each RC filtering unit consists of a resistor and a polar capacitor which are connected in parallel. By adopting the filter circuit, the direct current ripple value can be below 2%, and the requirement of experimental standards is met.

The transformer also comprises a 3-2 transformer connected to the voltage regulating module. The 3-2 transformer is a balance transformer, is a power transformer for special voltage grades, and is required to meet the requirements of severe traction load change and frequent external short circuit. In the grounding test, in order to meet the grounding test of alternating current large current, a 3-2 transformer is added on a voltage regulating module, and 380V three-phase electricity is converted into two-phase electricity for testing.

And the transformation controller of the 3-2 transformer is integrated on the control module.

The output range of the 3-2 transformer is maximum two-phase alternating current output 800V and current 312A.

The pressure regulating module, the direct current module and the alternating current module are integrally installed in the container. Adopt the modularized design, with the integrated installation of whole test equipment in the customization container, carry out special design such as antidetonation, anti height, low temperature, greatly promote efficiency of software testing and transportation fail safe nature, reduce the degree of difficulty of fortune dimension maintenance, also effectively solve plateau mountain region equipment transportation reliability problem, satisfy all kinds of large-scale transformer substations, power station, converter station and earthing pole test demand completely.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the mobile multifunctional grounding device test system solves the problem of miniaturization of large-current grounding test equipment, and reduces the installation difficulty and labor cost;

2. The mobile multifunctional grounding device test system can generate a great DC current of a hundred ampere level, and has a higher measurement signal-to-noise ratio on stray current in the ground.

drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.