The REB670 is specifically designed for the selective, reliable, and rapid differential protection of busbars, T-connections, and meshed corners. It is versatile, applicable for single and double busbars with or without transfer bus, as well as double circuit breaker or one-and-a-half circuit breaker stations. This IED is suitable for medium voltage (MV), high voltage (HV), and extra high voltage (EHV) installations operating at power system frequencies of 50Hz or 60Hz. It can detect various internal faults, including phase-to-phase and phase-to-earth faults in solidly or low impedance earthed power systems, and multi-phase faults in isolated or high-impedance earthed systems.
Key Features
Minimal requirements on main current transformers (CTs), eliminating the need for interposing current transformers.
Ability to include and mix main CTs with 1A and 5A rated secondary currents within the same protection zone, accommodating up to a 10:1 ratio difference.
Numerical, low-impedance differential protection function designed for fast and selective fault protection within the protected zone.
Restraint feature for all connected CT inputs, with the minimum pick-up value for differential current set for suitable sensitivity to internal faults.
Fast tripping time advantageous for power system networks with high fault levels or requiring rapid fault clearance for stability.
Advanced open CT detection algorithm instantly identifies open CT secondary circuits, preventing differential protection operation without additional checks.
Differential protection zones include a sensitive operational level, capable of detecting internal busbar earth faults in low impedance earthed power systems or when high sensitivity is required due to long line energizing.
Operating Characteristics
The overall operating characteristic of the differential function in the REB670 is illustrated in figure 1.
Answer 1: PLC DCS Pro Ltd. collaborates with over 50 countries worldwide. As a leading supplier in China, we can provide significant discounts to customers based on market demand.
Question 2: What Is The Warranty Period?
Answer 2: We offer a standard one-year warranty for all new and original items.
Question 3: What Payment Methods Do We Accept?
Answer 3: We accept 100% T/T (Telegraphic Transfer) before shipping. For items with a lead time, a 30% deposit is required in advance, with the remaining 70% balance due before shipping. If you have an agent in China, please contact us for RMB transfer.
Question 4: What Shipping Methods Do We Use?
Answer 4: We primarily utilize carriers such as FedEx, DHL, UPS, BRE, etc. If you have an account with any of these carriers, you can arrange the shipping yourself. Additionally, we offer free shipping to China freight forwarders.
Question 5: What Is Our Delivery Time?
Answer 5: Typically, delivery takes around 1-3 days after receiving the advance payment. For items with a quoted lead time, delivery will occur as per the specified lead time.
Question 6: How Do We Package The Goods?
Answer 6: Our packaging process involves multiple layers of protection. Initially, the product is placed in its original box, sealed with a label. Then, we add a layer of bubble wrap to safeguard against collisions during transportation. Finally, all products are securely packed in sturdy boxes for further protection.
Question 7: How Can Customers Contact Us And Request A Quote?
Answer 7: Customers can inquire via email, WhatsApp, WeChat, Skype, or any preferred communication platform. Simply reach out to us, and we'll promptly provide a quote tailored to your needs.
Warranty Conditions
At PLC DCS Pro Ltd., we are committed to ensuring the quality of our products. Our one-year warranty provides coverage for any defects in material or workmanship, excluding damages caused by deliberate misuse.
🛡️Coverage Details:
This warranty encompasses all instances of product malfunction or failure due to inherent manufacturing flaws, with the exception of intentional damage.
📝Claim Process:
To avail of warranty services, please notify us of any quality-related issues within the warranty period. We may conduct online troubleshooting and examination as needed.
🚚Shipping Assistance:
We understand the importance of prompt service. Therefore, we cover return shipping costs for warranty-related returns within the first month of supply. Within three months of supply, we cover one-way shipping costs for warranty-related returns. After three months, the customer is responsible for shipping costs both ways.
🚫Exclusions:
Unauthorized modifications, repairs, or misuse of the product.
