Descripción del producto
Brief Introduction to product
With neutral grounding resistance is installed, when
nonmetal grounding, the current flowing through grounding point and
neutral would be much less than that when metal grounding.
Meanwhile sound phase voltage rise is lowered a lot and
zero-sequence voltage is half of that when single-phase metal
grounding. Therefore, adopting neutral grounding via resistance
could decrease transient overvoltage when single-phase grounding,
and eliminate arc flash hazards like transient overvoltage and some
resonant overvoltage, and moreover it could adopt simple relays to
quickly locate the fault line and clear it up.
Mingrui has outstanding technical researching team and superior
equipments, specially concentrate on research & development,
production, sales and service of neutral grounding series products
of power distribution system. The transformer neutral grounding
resistance we developed and produced is applicable to 6~*5KV power
distribution grid of cable lines in cities, large industrial
enterprises, factories, airports, seaports, subway and etc. as well
as 0.*6KV system in mine digging and 0.4kv/6kv/*0kv system in power
plants.
Applicable Standards
The design of the product complys with the following standards:
IEC**6 Dry-Type Power Transformer
IEC***1 Experimental Technique of High
Voltage
IEC****9:***1 Enclosure Protection Degree (IP code)
IEEE******2 Technique Terms and Experiment of Neutral
Grounding Device
IEC****1 Insulation Co-ordination of Transmission
and Distribution Device of High Voltage
The Characteristeic of the Product
3.1 Adopted high quality imported stainless steel or
domestic stainless steel electric heating metal material,
the product operates safely and reliably with the advantages of
high conductivity, high temperature coefficient, corrosion
resistance, thermostability, good oxidation resistance, high
tensile strength, resistance value stability and etc.
3.2 The device also could be applied in medium power
distribution system. When transformer is angle-connected,
independent grounding transformer could be installed with which the
neutral point and resistance are connected.
3.3Resistance value could be designed from 1ohm to ***0ohm and
current from 1A to ***0A
3. 4 The cabinet could be installed indoor or outdoor. As
the cabinet body is corrosion-resistant and of high protection
grade, made from stainless steel plate or painted cold rolled steel
plate.
3.5 The counting function could be added to the device, which
records times of resistance grounding.
3.6 Isolated switch could be added which convenient examination and
repair and so does temp. or humidity controller.
3.7 Intelligent monitor is at customers option, which could monitor
un-balanced current of neutral point when resistance cabinet is in
normal operation, temp. of resistance panel, and temperature of
inside cabinet, measure transient current and records grounding
times when single-phase grounding happens, reserve communication
interface which could send monitored and recorded to master-control
room so as to let operating people get the information in the first
time.
Model Meaning
Typical Technology Parameters
Various resistors could be designed as per customers requirement,
value ranging from 1
Ωto
***0
Ω. Current allowed to
flow through is from 1A~***0A and the flowing time is
*0s,*5s,*0s,*0s and 2h.
Schematic Diagram for Wire Connection
6.1 The transformer adopts star connection with neutral leading-out
wire ,connected as in figure 5.
6.2 If the neutral is triangle-connected, neutral grounding
resistor is grounded by grounding transformers. Connection is as in
figure 6
Service Condition
8.1 Generally applicable to outdoors,used in the system of *0 Hz
and *0 Hz.
8.2 The altitude shall not exceed ***0m.
8.3 Ambient temperature : **0
℃~**0
℃，Relative humidity:
≤*5%
8.4 Wind pressure is not higher than **0Mpa (equal to wind velocity
*4m/s)
8.5 Earthquake intensity :
＜8 degree
8.6 Thickness of coated ice:
＜*0mm
8.7 Grade of air pollution: not higher class
â…£
8.8 The air at the installation site shall be free from
inflammable/ explosive/ corrosive gas,and conductive dust.
8.9 As resistor is heating device. The temperature will rise high
when using it. Therefore, some space should be left around the the
place where the resistor is installed, avoiding being influenced by
external heating source. Please pay close attention to this.
Notice for Ordering
Please let us know the parameters below.
9.1 Rated Voltage of System: (kv)
9.2 Current Value Allowed to Flow Through in Short Time:(A)
9.3 Nominal Resistance Value:(
Ω)
9.4 Whether current transformer needed or not (CT)?
Ratio and capacity and composite error of it is
required.
9.5 Wire-in and wire-out modes are for choice:
a. top-in and bottom-out, b. bottom-in and
bottom-out,
c.side-in and side-out, d. side-in
and bottom-out.
9.6 Allowable Time of Current Flowing Through in Short
Time:(S)
9.7 Material of resistor cubicle,protection grade of cubicle(IP),
the color code and installation location.
9.8 Optional Devices: Recorder of Grounding, Controlling Device of
Temp. and Humidity.
| País: |
China |
| N º de Modelo: |
MRD-BJ
|
| Precio FOB: |
2500 ~ 9800 / Set ( Negotiable ) (Negociable)
Obtener el precio más reciente
|
| Lugar de origen: |
- |
| Precio de pedido mínimo: |
2500 per Set |
| Cantidad de pedido mínimo: |
1 Set |
| Detalle de embalaje: |
Inner packing: PE film bag or as per client's request; Out packing: corrugated carton or wooden |
| El tiempo de entrega: |
25-30 working days against deposit or L/C |
| Capacidad de suministro: |
70 Set per Month |
| Tipo de pago: |
PayPal, Money Gram, Western Union, L/C, T/T |
| Grupo de productos : |
Neutral protection devices
|
