10KV grounding resistor
10KV grounding resistor
Product introduction
The 6kV～35kV transmission and distribution system is mainly composed of cable lines. When the single-phase grounding fault capacitive current is large, in order to better limit the system overvoltage level and quickly select and remove the fault line, the neutral point resistance grounding mode can be adopted.
However, the power supply reliability requirements, the impact of transient voltage and transient current on electrical equipment during faults, the impact on communications, technical requirements for relay protection, and local operating experience should be considered.
However, factors such as the power supply reliability requirements, the impact of transient voltage and current on electrical equipment, the impact on communication, relay protection technical requirements and local operation experience shall be considered.
Grounding resistor primary system diagram
Operating environment
Indoor | Outdoor | |
Ambient temperature | -25℃～+40℃ | -35℃～+45℃ |
Daily temperature difference | ≤25K | ≤25K |
Altitude | ≤1000m (if more than 1000m, correct according to the corresponding formula) | ≤1000m (if more than 1000m, correct according to the corresponding formula) |
Product features
1. Strong pertinence and protection in place
TK-BJ transformer neutral point grounding resistor cabinet is applicable to the occasions where the neutral point of the system is grounded with small resistance or medium resistance. At this time, in case of single-phase grounding fault in the power grid, it is necessary to immediately trip and cut off the faulty line. When single-phase grounding occurs in the power grid, the grounding resistance provides additional resistive current to the grounding point, making the grounding current resistive and capacitive, so as to ensure that the overvoltage generated does not exceed 2.6 times the phase voltage.
2. Compact in structure and easy for installation
The TK-BJ transformer neutral point grounding resistor cabinet combines scattered Z-type grounding transformer (if there is no neutral point lead out in the system, it needs to be added), resistor, current transformer, measuring instrument, grounding protection output terminal and other electrical equipment in a closed metal cabinet, and it can be equipped together with disconnector and lightning arrester as a complete device. With high safety and reliability, clear and orderly layout, it is convenient for installation, commissioning, operation and maintenance.
3. Exquisite selection of materials to fully guarantee product quality
The grounding transformer in the TK-BJ transformer neutral grounding resistor cabinet is a high-quality dry-type transformer, and its primary winding is "Z"-shaped wiring; the resistor is made of stainless steel, with high conductivity, strong current capacity and high temperature resistance, whose highest operating temperature can reach 1600℃; the device is corrosion resistance, flame and explosion proof, and high in reliability, whose temperature coefficient ≤ -0.045%/℃. All resistors composed of alloy materials use resistance units, and multiple units are arc welded to a frame structure. The resistor units are supported and connected by high-temperature insulators (polymers), and according to different customer requirements, our company can provide imported resistors.
4. Complete monitoring functions and analog output provided
TK-BJ transformer neutral point grounding resistor cabinet can be equipped with intelligent monitoring device, which can monitor the neutral point unbalanced current, resistor strips and temperature in the resistance cabinet under normal operation of the resistance cabinet, and It can also monitor the instantaneous current when a single-phase ground fault occurs, and reserve a communication interface, which can transmit the detection information to the main control room, so that the operating personnel can get the information in the first time.
Application fields
The products are widely used in metallurgy, petrochemical, photovoltaic power generation, wind power generation and railway. They can effectively limit the intermittent arc grounding overvoltage, reduce the system operation overvoltage, eliminate the system resonance overvoltage, facilitate the configuration of single-phase grounding fault protection, and effectively remove the fault line in a short time, thereby reducing the insulation level of system equipment, extending the service life of system equipment and improving the safety and reliability of system operation.