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:When a fault occurs in power system, the circuit breaker tripping device near fault
When a fault occurs in power system, the circuit breaker tripping device near the fault, in order to reduce the power outage, this is the relay protection ().A, selective B, reliability C, sensitivity D, non selectivity
Q:Three sets of complete sets of power equipment exports what is it
As well as protection, control, measurement and other devices are assembled in a whole cabinet, there are a number of high-voltage switchgear in power plants, substations or power distribution equipment installed after the installation of the power plant is called a complete set of power distribution equipment.
Q:I would like to ask the power experts, according to the annual additional electricity, installed capacity
At least the national research institutions to do, here is about not a conclusion. If such a conclusion, it also belongs to the commercial classified data, not just to show people.
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:Electric power equipment start-up and commissioning of the project there is a difference?
The start of the equipment is started in the single test.
Q:What are the characteristics of the grounding of the power system and equipment?
According to the use and nature of grounding, it can be divided into "working grounding" and "security grounding".
Q:What are the business scope of Electric Power Engineering Co., Ltd.
Do not need to be able to do anything! Or you can hang on to someone else's qualifications!
Q:What is the equipment that can emit and absorb reactive power in electric power system
Other static compensation equipment. The utility model relates to a capacitor and a reactor, which belongs to a device for absorbing reactive power
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:The role of electrical equipment handover and preventive testing
Is your company product acceptance test of customer delivery, in order to find new equipment in the design, manufacture, transportation and installation in the process of diagnosis is consistent with the risks, operational conditions, testing of new equipment.

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