Arc Suppression and Harmonic Suppression Low-Voltage Control Cabinet
Short Description:
Arc suppression and harmonic elimination cabinets are used in the power industry for 3-35KV power systems with ungrounded neutral points, neutrals grounded through arc suppression, or neutrals grounded through high resistance. They can limit various overvoltages in the system, effectively improving operational safety and power supply reliability.
Product details
Product Overview:
Arc suppression and detuning cabinet is used in the power industry for 3-35KV neutral point ungrounded, neutral point through arc extinguishing grounding or neutral point through high resistance grounding, which can limit all kinds of overvoltages in the system, effectively improving the operation safety of the system and the reliability of power supply.
At the same time, due to the long duration of arc light grounding overvoltage, the energy can easily exceed the capacity of the arrester, resulting in the arrester explosion. Then there is the high amplitude of overvoltage generated by arc light grounding, which aggravates the cumulative damage of solid insulation such as cables, and even breaks down the cannon.
The arc detuning polyelectric overvoltage suppression cabinet is suitable for 3~35kV neutral point non-direct grounding system, which is mainly used to limit various phase-ground and interphase overvoltages (such as: atmospheric overvoltage, single-phase intermittent arc light grounding overvoltage, ferromagnetic resonance overvoltage, etc.) that occur in the operation of the system, especially eliminating the single-phase intermittent arc light grounding overvoltage, effectively keeping electrical equipment free from overvoltage, and improving the safety of power system operation and the reliability of power supply.
our country the current 3~35kV power system mostly adopts neutral point non-direct grounding mode, in order to improve the reliability of power supply, the power regulations stipulate that such systems can continue to run for 2 hours when single-phase grounding occurs, and single-phase grounding generally has two forms, one is metallic grounding, and its non-fault phase voltage increases by 3 times √. The second is single-phase intermittent arc light grounding, whose overvoltage amplitude can be as high as 3.5 times the normal operating phase voltage, but the operation experience proves that when this type of power grid develops to a certain scale, the internal overvoltage, especially the arc light grounding overvoltage generated when the power grid occurs single-phase intermittent arc light grounding and the ferromagnetic resonant overvoltage generated under the conditions have become a major threat to the safe operation of this type of power grid equipment, among which the single-phase arc light grounding overvoltage is serious.
At present, foreign countries (a few places in China have begun to trial) adopt the design and operation mode of neutral point through small resistance grounding for such power grids, but when this system occurs with single-phase grounding, it uses artificially increased short-circuit current to make the circuit breaker break quickly, and the method of directly cutting off the faulty grounding line cannot be distinguished from metallic grounding or arc light grounding, which expands the current burning of the fault point. And the overvoltage during the inherent operation time of the circuit breaker cannot be effectively limited. Causing long-term and large-scale power outages is very uneconomical from a development point of view.
The regulations stipulate that when a single-phase grounding fault occurs in a non-direct grounding system, it is allowed to continue operation for two hours, and it can be extended if approved by the relevant departments at a higher level. However, the regulations do not clearly define the concept of "single-phase ground fault". If the single-phase ground fault is metallic direct grounding, the ground voltage drop of the fault phase is zero, and the ground voltage of the remaining two healthy phases rises to the line voltage (U L i.e., √ 3 phase voltage). However, if the single-phase grounding fault is arc grounding, the value of the overvoltage can reach 3.5 times the peak of the normal phase voltage, and such a high overvoltage will inevitably cause cumulative damage to the insulation in the electrical equipment if it acts on the power grid for several hours, especially at the weak point of the outer insulation of the healthy phase, causing a major accident of interphase short circuit.
| Equipment Number | H3 |
| Equipment Model | KRXHG-12 |
| Primary Busbar | |
| Single Line Diagram - Rated Voltage 10KV |  |
| Equipment Purpose | Harmonic Resonance Cabinet |
| Capacity (kW) | 10kW |
| Voltage (V) | 10kV |
| Current (A) | 630A |
| Main Component | Model |
| Contactor | JCZ1-12D-400A |
| High Voltage Circuit Breaker | XRNP1-12/0.5A |
| High Voltage Circuit Breaker | XRNP1-12/80A |
| Voltage Transformer | JDZJ-10 1000/√3 100/√3 0.5/0.6H |
| Current Transformer | |
| Zero Sequence Transformer | |
| Overvoltage Protector | TBP-12 |
| Harmonic Resonance Damping | LXQ-10 |
| Principle Diagram/Operation Mode | Ready |
| External Dimensions (Width*Height*Depth) | 800*2300*1500 |
