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

Ref Price:
Loading Port:
Payment Terms:
Min Order Qty:
1 unit
Supply Capability:
1000 unit/month

OKorder Service Pledge

Quality Product

Order On-line Tracking

Timely Delivery

OKorder Service Pledge

Credit Rating

Credit Services

Credit Purchasing

Share to:

Product Description:


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  


Send a message to us:

Remaining: 4000 characters

- Self introduction

- Required specifications

- Inquire about price/MOQ

Q:In order to ensure the normal operation of the power system and equipment to achieve a grounding
2) protection of grounding: is the electrical equipment in normal circumstances, such as metal parts, such as metal shell, structural frame and the earth to make metal connection. In order to ensure personal safety.3) security is zero: is the electrical equipment in normal circumstances without the metal part of the system and the zero line connection to avoid the risk of electric shock. For three-phase four wire system of electrical equipment, must adopt the method of security zero.
Q:Insulation level of electrical equipment used in neutral point grounding system shall be
This is a bit of a problem, because there are different levels of insulation in the neutral grounding system. Some places are determined in accordance with the graded insulation, that is, the first and the end of the neutral point of the different requirements
Q:The relationship between primary equipment and two equipment in power system
Including generator, power transformer, circuit breaker, isolating switch, power bus, power cables and transmission lines, etc..
Q:Hello, I would like to ask what are the main rotating equipment in the power system? What is a rotating device?
Generators, motors, blowers, air conditioning, transportation, lifting, etc.. Rotating machinery can be called rotating equipment
Q:How to handle the qualification test, what kind of power equipment
(a) legal person qualification and perfect organization; (two) the registered capital and net assets of 60 million yuan; (three) the last 3 years to bear the following first items listed, third project and second sub items listed in any one project, and the project quality: above 1 thousand and 330 volts voltage substation 2 or 220 thousand volt substation 5; more than 2 thousand and 330 volt overhead lines 300 kilometers or 220 thousand volt overhead line of 500 kilometers; more than 3 thousand and 220 volt cable line 80 kilometers or 100 meters above the level crossing tower crossing project 1.
Q:Pre checking and checking of goods in power system
Check: the full name is a regular inspection, with the role of pre trial is almost the same as the general power system is the two equipmentGoods inspection heard, just heard of items set is the item visit orderly, convenient for production work.
Q:The production and transportation process of electric power
Transmission lines can be divided into overhead transmission lines and underground transmission lines according to the structure. The former is composed of line tower, conductor, insulator and so on, which is erected on the ground; the latter is mainly used for laying underground cable (or underwater). According to the nature of the current, the transmission can be divided into DC and AC transmission. In 1880s, the first successful realization of DC transmission, due to the low voltage limit (the transmission capacity is roughly proportional to the square of the transmission voltage) in the end of nineteenth Century for AC transmission replaced. AC transmission success ushered in the era of electrification in twentieth Century. Since 1960s, because of the development of power electronics technology, DC transmission has a new development, and AC transmission, with the formation of AC and DC hybrid power system.
Q:What are the lightning protection measures of power system
Power system lightning protection is to prevent the atmospheric overvoltage.The specific measures to prevent the atmospheric overvoltage are: to set up the lightning rod above the high-voltage line (to prevent direct lightning). Install lightning rod (lightning, lightning protection) at the equipment to be protected.
Q:What power equipment is needed for the motive,
As long as the hydraulic pressure machine, bearing induction heater, tooling, assembly line assembly, commissioning test bench. Large parts to a lot, such as various parts of the fixture, the assembly line to the rotary table, lifting operation, pneumatic tools, etc.......
Q:Electric power automation equipment
Power grid dispatching automation, power system analysis and control, power electronics, power market, distribution automation,

1. Manufacturer Overview

Year Established
Annual Output Value
Main Markets
Company Certifications

2. Manufacturer Certificates

a) Certification Name  
Validity Period  

3. Manufacturer Capability

a)Trade Capacity  
Nearest Port
Export Percentage
No.of Employees in Trade Department
Language Spoken:
b)Factory Information  
Factory Size:
No. of Production Lines
Contract Manufacturing
Product Price Range