MRD-FD Neutral Grounding Transformer for 6kv to 20kv

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1,Brief Introduction to Product

1.1  Scope of Application

MRD-FD type neutral ground resistor cabinet is complete equipment specially used by generators in power plant which adopts high-resistance grounding for neutral. The voltage grade for generator mainly ranges from 6kv to 20kv. When one point of the stator grounds, the device is able to limit the grounding current at a reasonable value, and effectively restraint arc flash transient overvoltage associated with single-phase grounding.

1.2  Operation Environment

1,Applies to indoors.

2,Ambient temperature: between -40 and +40 centigrade.

3,The altitude shall not exceed 3000m.

4,Relative humidity be or lower than 95%(25 centigrade)

5,Power grid frequency:58-62Hz (60Hz System), 48-52Hz (50Hz System)

6,The air at the installation site shall be free from chemical corrosion, vapour or explosive dust

2.1  Parameters of Grounding Transformer

Insulation class:H

Temperature rise:≤100K


Protection Level: for paper-insulated dry type grounding transformer, the PI is divided into IP00 (no enclosure), IP20, and IP23 (with enclosure) .

Insulation level, impedance voltage on-load loss and no-load loss are according to relevant national standards.

Insulation resistance testing: high voltage-low voltage and to earth≥300MΩ,and low voltage-earth≥100MΩ.


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Q:In power system, the general conditions for the selection of electrical equipment are
Electrical equipment to be as reliable as possible, must be selected according to the normal working conditions and the short circuit conditions for a variety of checks (such as thermal stability check and dynamic stability check)For some equipment also need to check the special items, such as circuit breakers and fuses to check the ability to break the current, the current limiting reactor to check the normal voltage loss and bus residual voltage, etc..
Q:Is the GIS in the electric power high voltage switch cabinet
High voltage electrical (mainly above 35kV) exposed to the air, common substation circuit breaker, isolating switch, bus, phases, equipment, and equipment between between and so must have a relatively large safety distance. This area is relatively large, but also exposed to the outside of the security risks are more. GIS is a kind of technology, the bus CircuitBreakers isolating switch for high-voltage electric appliances shell pack, seal filled with six sulfur hexafluoride gas, according to the elements of seal, not a whole big box, such as every bus from the outside is a large cylinder etc.. This equipment can be very compact layout, and a sealed shell, but also more secure.High voltage switchgear is only a device installed in a cabinet, and this is generally high voltage 10kV, up to 35kV, and then there is no general high switch cabinet this form. Of course, you can also use GIS technology. But generally speaking, GIS is more than 110kV GIS switch station.You can Baidu image search GIS switch station". You can see that the big cylinder together is the GIS switch equipment, large cylinder which is the bus, circuit breakers and other equipment, see pictures more intuitive.
Q:What are the effects of frequency variation on power users and power systems?
As we all know, the asynchronous motor is widely used in industry. Its speed and output power are related to frequency. Changes in frequency, speed and power output of the motor is also changing, which seriously affected the quality of the product; modern industry, national defense and scientific research has been widely used in various electronic technology equipment, if the system frequency instability, affect the accuracy of these devices will be.
Q:What is the concentrator of the power set
There are two types of remote meter reading devices in electric power generation: one is low voltage set, called concentrator, the other is called terminal. The concentrator role is the number of meter data, first by the carrier or 485 communication way to collect the equipment, and then through the cable (optical fiber) or wireless network (cdma/gprs) transmitted to the main station.
Q:How long has the power of power electronic equipment delivered water
Major equipment and componentsPneumatic conveying equipment in general by the receiver (such as pipes, nozzles, transmitter, etc.), wind pipe, pipe separator (the volume and the cyclone two), air lock (the tipping and rotary two, can be used as feeder, and can be used as a discharger) and the dust collector and fan (such as centrifugal fan, blower, water ring vacuum pump, air compressor and other equipment and components). The role of the feeder is to enter the material, resulting in a suitable material to gas ratio, so that the material start, accelerate. The role of the separator is to separate the material from the air and to sort the material. The utility model relates to an air lock device, which is used for feeding or discharging uniformly, and preventing air leakage. The role of the fan is to provide power for the system. High pressure centrifugal fan or water ring vacuum pump is used in vacuum suction system.
Q:How to handle the qualification test, what kind of power equipment
Acceptance; staff review the material you submitted to meet the requirements, may be 10 working days.(three) after acceptance, on-site verification. Staff to review your outfit team.
Q:Power transformer equipment bidding procurement are in what units
Power Grid Corp on the volume of business is greater, because their main business is to invest in the construction of power grids.There are also a small number of individual units, such as large projects and large enterprises.
Q:Two power equipment; I was engaged in a number of more than a few cabinets to know more about the two
The common measurement and control cabinet are generally some common control signals such as AC / DC screen, knife position, device power loss and telemetry some voltage and current value, there are no specific remote control, measurement and control device of equipment access to public control
Q:What are the necessary equipment for power line project?
It must have a climbing tool, such as irons, safety belts, safety helmet; and lifting equipment, such as cranes, hydraulic lift truck, pulley, winch, pole and so on; there must be bearing equipment, such as various tensioners, hand gourd, line cards, traction machine, tension machine;
Q:What equipment is necessary on the list of electrical engineering equipment?
Take 35KV power engineering, the need for ZGF-400kV/2mA DC high voltage generator

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