⇒Product introduction：

The MICOM P127 Ground fault protection is an important electrical safety measure used to cut off power or send an alarm in the event of a ground fault in an electrical system to prevent electric shock accidents and equipment damage. This protection function can usually be integrated into the circuit breaker, and under normal circumstances, when the contact voltage exceeds 50V, the fault circuit should be cut off within a specified time.

The MICOM P127 ground fault protection can be implemented in a variety of ways, including overcurrent protection, zero sequence current protection, and residual current protection. Zero sequence current protection uses the zero sequence current generated when the three-phase load is unbalanced. When a ground fault occurs in a certain phase, the zero sequence current will increase significantly, so as to achieve fault detection. Residual current protection is achieved by detecting the vector sum of the three-phase current and the neutral current, which is normally zero and will generate residual current when a ground fault occurs.

When implementing ground fault protection, IT is necessary to consider different grounding systems, such as TN, TT and IT systems, and use in combination with equipotential connections to improve the protection effect. For example, zero sequence current protection is suitable for TN grounded systems, but not for TT systems, because the three-phase unbalanced current in TT systems is large, and it is difficult to detect the fault current. Residual current protection is suitable for TN, TT and IT grounding systems, but not for TN-C grounding systems, because in TN-C systems, the protection wire PE and neutral wire N are combined into a single PEN wire, which makes residual current protection devices unable to detect residual current.

The application of MICOM P127 ground fault protection technology in distribution network is very important, which has a decisive impact on the safety and reliability of power supply. In recent years, many accidents caused by grounding fault have aroused the attention of the society, and prompted the power grid company to attach great importance to the grounding fault protection. The State Grid Corporation has changed the practice of allowing the small current grounding system to operate with grounding faults, and put forward the distribution network grounding fault disposal principle of “instantaneous fault safety arc elimination, permanent fault rapid isolation”.

In practical applications, the MICOM P127 grounding fault protection technology includes small current grounding fault transient line selection, positioning and multistage protection technology, as well as flexible grounding protection technology for cable networks. By comparing the derivative of transient voltage and the polarity of current, the new transient protection method can realize fault line selection, which has higher resistance to transition resistance and the success rate of actual fault line selection.

For systems using frequency converters (VFDS), ground fault protection faces some challenges, such as system capacitance, unbalanced single-phase loads, current sensor limitations, low frequency operation, harmonic components, and VFD carrier frequencies that may limit the ability to measure low-level ground fault currents. In high resistance ground (HRG) systems, the neutral point of the transformer is connected to the ground by the neutral ground resistance, limiting the ground fault current to a low value, allowing the system to continue operating in the event of a ground fault, while eliminating most of the danger of arc flash. However, in order to detect a ground fault, it is often necessary to use a current-sensing ground fault relay, which uses a magnetic potential balance zero-sequence current transformer to detect currents that should not be present, thereby alerting or tripping the faulty part

⇒About Chengdu Sunshine Xi He

Chengdu Sunshine Xi He Electric Co., Ltd. specializes in selling the world’s major electrical brand products overseas direct procurement,

genuine inventory, price preferential after-sales warranty, complete models, the same product, not the same price and service.

Large supply of original imported DCS system accessories, PLC system accessories.

Main :ABB, GE Fanuco, Bentl Bentley, Triconex Invensys, Woodward Woodward, Foxboro, Foxboro,

Westinghouse /Emerson, Reliance Ryan, SchneiderModicon, A-B, HIMA dark horse, Motorola MOTOROLA,

Kollmorgen Kollmorgen Bosch/Rexroth/ Bosch Rixon, NI,YOKOGAWA Yokogawa, and other major brands of DCS system accessories,

robot system accessories, large servo system discontinued spare parts.

 

⇒Contact us freely

BeiLin

| Mobile/wechat：+86 18005021035

Email contact：18005021035@163.com

 

⇒What can we do for you?

1. All items are new.
2. Any enquiry will be answered within 1 hour.
3. We check them before shipping!

⇒About Frequently Asked Questions

Q: Are you a trading company or a manufacturer?
A: Yes, we are a trading company.

Q: Do you have stock or need to buy from another supplier?
A: We have a lot of inventory to sell and we have our own warehouse.

Q: Do you sell outdated products? Or even a very old product?
A: If there is a new model that needs to be replaced, we will recommend that you use the new model;
If the replacement is not easy, we will help check that the old car is in good condition.
If used or otherwise, we will tell you the truth.

Q: How long is your delivery time?
A: If the goods are in stock, it usually takes 2-3 working days. If the quantity is large,
It takes 5-7 business days after receipt of payment.
If it is not an ordinary product, it always takes 3-4 weeks to order.

⇒Company Services:

1. Fast delivery (1-7 days for stock products)

2. Rich experience (more than 10 years of sales experience)

3. Large inventory (various brands and overseas warehouses)

4. Quality insurance (1 year warranty product condition is clear)

⇒运输 

1. For stock items, we will ship them to you within 7 days of receipt of payment

2. We can ship all over the world via DHL, UPS, FEDEX, TNT and EMS.

3. If you have a shipping agent, please let us know before shipping.

4. We will pack the parts in strong boxes. If you have any special needs, please let us know.

5. We usually ship the goods before 4:30 p.m., after which we will send you the tracking number. It takes 7 to 15 days to receive the package.

6. Please email us when you receive the package.

7. When asking for shipping costs, please include all information, otherwise it will slow down the process.

1) What is your zip code?

2) If you have a company name and your name, what is your company name?

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