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． Implementation standards
. Product features
． Model description
. Typical technical parameters
. Wiring schematic diagram
.Outline and installation dimensions
. Ordering Instructions
． Precautions for on-site installation
． Inspection and testing
． Operation and maintenance
． Packaging, transportation and storage
Contact person: Li Wei
Series transformer neutral point grounding resistance cabinet
． Product Overview
The neutral point grounding methods of the power distribution system usually include the neutral point being ungrounded, the neutral point being grounded through a resistor, and the neutral point being grounded through an arc suppression coil. Various grounding methods are different and used in different ways. With the development of the national economy, many urban distribution networks have changed from being dominated by overhead lines to being dominated by cable lines. At the same time, some new equipment, such as compact closed switch cabinets, AC Polyethylene cables and zinc oxide arresters are becoming more and more widely used, which makes the original ineffective grounding methods somewhat inapplicable. Therefore, how to effectively and economically set up neutral point grounding has become the focus of current power supply work.
At present, many distribution network neutral points in my country have adopted the operation mode of resistor grounding. After the neutral point grounding resistance cabinet is installed, when non-metallic grounding occurs, the current flowing through the grounding point and neutral point is significantly lower than that of metallic grounding due to the influence of the grounding point resistance. At the same time, the increase in the sound phase voltage is also Significantly reduced, the zero-sequence voltage value is approximately half that of a single-phase metallic ground. It can be seen that using the neutral point to be grounded through a resistor can reduce the transient overvoltage when single-phase grounding, eliminate arc grounding overvoltage and some resonant overvoltage, and can use a simple relay protection device to quickly select the fault line, Remove the fault point.
． Implementation Standards
This product is designed to meet the following standards:
/ Distribution system neutral point grounding resistor
B Dry-type power transformer
/ Overvoltage protection of AC electrical installations and Insulation coordination
B/ High voltage test technology
B Current transformer
B Enclosure protection level (code)
Technology, terminology and testing of standard neutral point grounding device
B. Insulation coordination of high-voltage power transmission and distribution equipment
/ Common ordering technical conditions for high-voltage switchgear
B Standard for handover test of electrical equipment for electrical installation installation projects
. Product features
.The product is made of high-quality imported stainless steel or domestic stainless steel electric heating metal material. It has excellent characteristics such as high conductivity, high temperature coefficient, corrosion resistance, high temperature resistance, strong oxidation resistance, high tensile strength and stable resistance value. The product Safe and reliable operation.
.This product can also be used in various medium-voltage distribution systems. When the transformer is corner-connected, an independent grounding transformer can be installed and the neutral point resistor can be connected to it.
.The resistance value of the resistor cabinet can be designed from ohm to ohm, and the current can be designed from ampere to ampere.
.The resistance cabinet is used outdoors or indoors. The cabinet body is made of stainless steel plate or cold-rolled steel plate spray-painted, which is corrosion-resistant and has high protection level.
.The product can add counting function. Record the number of times the resistor is connected to ground. Series transformer neutral resistance cabinet
． Product Overview
． Implementation standards
.Product features
. Model description
.Typical technical parameters
.Wiring schematic diagram
.Outline and installation dimensions
. Ordering Instructions
． Precautions for on-site installation
． Inspection and testing
． Operation and maintenance
． Packaging, transportation and storage
Contact person: Li Wei
>
Series transformer neutral point grounding resistance cabinet
． Product Overview
< /C:\C~\~\C~\\\.. />The neutral point grounding methods of power distribution systems usually include ungrounded neutral point, grounded neutral point through resistor and neutral point. The point is grounded through the arc suppression coil. Various grounding methods are different and used in different ways. With the development of the national economy, many urban distribution networks have changed from being dominated by overhead lines to being dominated by cable lines. At the same time, some new equipment, such as compact closed switch cabinets, AC Polyethylene cables and zinc oxide arresters are becoming more and more widely used, which makes the original ineffective grounding methods somewhat inapplicable. Therefore, how to effectively and economically set up neutral point grounding has become the focus of current power supply work.
At present, many distribution network neutral points in my country have adopted the operation mode of resistor grounding. After the neutral point grounding resistance cabinet is installed, when non-metallic grounding occurs, the current flowing through the grounding point and neutral point is significantly lower than that of metallic grounding due to the influence of the grounding point resistance. At the same time, the increase in the sound phase voltage is also Significantly reduced, the zero-sequence voltage value is approximately half that of a single-phase metallic ground. It can be seen that using the neutral point to be grounded through a resistor can reduce the transient overvoltage when single-phase grounding, eliminate arc grounding overvoltage and some resonant overvoltage, and can use a simple relay protection device to quickly select the fault line, Remove the fault point.
． Implementation Standards
This product is designed to meet the following standards:
/ Distribution system neutral point grounding resistor
B dry-type power transformer
/ Over-voltage protection of AC electrical installations and Insulation coordination
B/High voltage test technology
BCurrent transformer
BEnclosure protection level (code)
Technology, terminology and testing of standard neutral point grounding device
B. Insulation coordination of high-voltage power transmission and distribution equipment
/Common ordering technical conditions for high-voltage switchgear
B Electrical equipment installation engineering handover test standards
< /C :\C~\~\C~\\\.. />.Product Features
< /C:\C~\~\C~\\\.. />< /C:\C~\ ~\C~\\\.. />.The products are made of high-quality imported stainless steel or domestic stainless steel electric heating metal materials, which have high conductivity, high temperature coefficient, corrosion resistance, high temperature resistance, strong oxidation resistance, high tensile strength and resistance Value stability and other excellent features, the product operation is safe and reliable.
< /C:\C~\~\C~\\\.. />< /C:\C~\~\C~\\\.. />. This product can also be used in various In this medium-voltage power distribution system, when the transformer is corner-connected, an independent grounding transformer can be installed and the neutral point resistor is connected to it.
.The resistance value of the resistor cabinet can be designed from ohm to ohm, and the current can be designed from ampere to ampere.
.The resistance cabinet is used outdoors or indoors. The cabinet body is made of stainless steel plate or cold-rolled steel plate spray-painted, which is corrosion-resistant and has high protection level.
.The product can add counting function. Record the number of times the resistor is connected to ground.
< /C:\C~\~\C~\\\.. />. An isolation switch can be installed for easy maintenance, and a temperature and humidity control device can also be added.
. Intelligent monitoring devices can be installed to monitor the unbalanced current and resistance of the neutral point under normal operation of the resistor cabinet
>
Chips and resistors in the cabinet The temperature can also be monitored when a single-phase connection occurs
. An isolation switch can be installed for easy maintenance, and a temperature and humidity control device can also be added.
.An intelligent monitoring device can be installed, which can monitor the unbalanced current of the neutral point, the temperature in the resistor
chip and the resistance cabinet under normal operation of the resistance cabinet, and can also monitor the occurrence of single-phase connection
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