MRD-L Zero-sequence CT (equiped with relay protector or signal devices)

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Zero Sequence Current Transformer


Product Overview

When circuit grounds, CT could senses zero-sequence grounding current. To be equiped with relay protector or signal devices, it help device components act for the purpose of protecting or monitoring circuit.

MRD-L series zero-sequence CT is a kind of cable type, using ABS engineering plastics as casing, poured by resin. With beautiful appearance, good hermeticness, high insulation, high sensitivitym, good linearity, easy installation and wide application, it is not only suitable to magnetic relay, but also to electronics and mico-computer devices. CT type is determined by the operation way of user.(Neutral ground, unground,ground by high-resistance,low resistance or arc suprression coil.)

MRD-L series zero-sequence CT core is made of ZH120-130 cold rolled silicon steel sheet imported from Japan with advantages of smooth surface, constant thickness, good conductivity, strong sensitivity to magnetizing, accuracy and stability.



Inner Diameter (select site cable and inner diameter of zero-sequence CT), See table1




0-sequence CT Spec.

Cable Section(mm2)


50 and below


70     3×95


120  3×150  3×185


(3×150)  3×240  3×300








(3×240)  2×(3×300)   4×(3×185)


1. Maximum capacity, better limite voltage effect, more widely applicable scope, stronger tolerance , long lifespan


2. Voltage impact coefficient is 1, under the various kinds of electric voltage waveform, the voltage values are equal


3. With zinc oxide nonlinear resistors and discharge gap between the structure, make the two are complementary protected. The spark gap make the State-of-Charge of zinc oxide resistance to zero, Zinc oxide resistance nonlinear characteristics also make the spark gap action without free-wheeling in future, The spark gap no longer bear arcing tasks, and improve the service life of the product;


4. Four lines connect method, can be greatly reduce the voltage of phase, the reliability of the protection is greatly improved;


5. Valve plates and the spark gap assemble space, and mutual influence, discharge electrode is not easy to damp, be oxidated, make action value more stable and reliable.


6.Take overvoltage action techniques and fault automatically function , realize the device maintenance free, at the same time, to avoid the tedious work periodically, to solve the engineering and technical personnel to worry about the problems of the equipment safe running .


Selling Units:Single item
Single package size: 15X40X40 cm
Single gross weight:35.0 KG
Package Type:CARTON

1. We are willing to customize for each new product

2. Supply all the components and accessory of High Voltage Switchgear

3. Yueqing Hossin Electrical Co., Ltd. is prosperously specialized in the production of high voltage electrical products. Our leading products include vacuum circuit-breakers, sulfur hexafluoride circuit breakers, arresters, current limiting fuses, load switches, isolators, operating mechanisms, wall drive pipes, and insulators. Our products have passed through ...

Basic Information

Product/Service (We Sell):Arrester,drop fuse,limiting fuse,disconnector,load switch  
Number of Employees:501 - 1000 People  


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Q:Is the installation of railway communication, signal and power related to mechanical and electrical engineering
3, in fact, including the power of the two professional: power and electrification. Including contact network infrastructure, post, wire rack, remote control, lightning protection system, station lighting intelligent control etc..Belong to the scope of the installation should be the station (communication station) equipment into the test, the basis of processing and installation, equipment installation, commissioning of the single body, the electrical subsystem Unicom debugging, the whole system of professional debugging unicom. And other railway professional with the commissioning test, etc..
Q:Power equipment is required to replace the dimension, the state has no relevant provisions
But more time has entrusted operation maintenance experience unit maintenance, power equipment to customers is good, one can improve the safe and stable operation of equipment, to meet the demand of a power supply section, on the other hand it can guarantee and increase operation life of equipment.
Q:What is the meaning of the power equipment in criminal law
Not yet installed agricultural low-voltage lighting circuit, not in the use of electrical equipment. Even if the person who took part in the erection of the wire, it will not cause harm to public safety, its behavior should be qualitative theft.
Q:The cost calculation of power equipment
Fault and professional people to do the cost of fault handling and so on, there is no fixed standard, depending on the site
Q:In power system, the general conditions for the selection of electrical equipment are
Suitable voltage rating, suitable for workplace and environment, necessary protection
Q:On the safety hazards of electric equipment safety
4 where the demolition, the power line protection zones of overweight, lifting, drilling, piling, scaffolding and other construction work, it shall be permitted by the power supply departments, take appropriate safety measures, and can work in the power supply department under the supervision of professional staff.5 prohibit the installation of electric power facilities within the range of 500 meters to carry out blasting operations, fireworks, etc..6 prohibit fishing in the power line protection zone, in case of personal electric shock accident.7 ban on power line protection zones, such as various types of debris piled hay straw, especially prohibit piling flammable and explosive materials.
Q:Definition of power equipment defects
Personal opinion: defects and hidden dangers have certain differences, can not be equated with the...
Q:What are the characteristics of the grounding of the power system and equipment?
Security grounding - is to protect the safety of the people and set the grounding point, such as: electrical equipment shell grounding, voltage transformer grounding two times, etc..
Q:Is there a warranty period for power equipment?
Warranty period is not specified, is determined by the relevant test standards
Q:What are the lightning protection measures of power system
Use of cables in overhead line terminations (absorbing lightning waves). Arrester installed on overhead line terminal. Use of devices to prevent the operation of over-voltage as the backup protection of atmospheric overvoltage. To reduce the grounding resistance of tower.Improve the insulation level of the system. Wait。

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