ABB RET521 1MRK001530-AC RELAY Transformer protection terminal

ABB RET521 1MRK001530-AC RELAY Transformer protection terminal
 

Features:

 • Multiple function transformer protection terminal in a compact design

• Numerical microprocessor design with advanced facilities

• Suitable for power transformers, generatortransformer blocks and reactors

• Variants:

• Two-winding transformer application

• Three-winding transformer application

• Both with multi-breaker arrangement connections possibilities

• No interposing Current Transformers required

• Application flexibility through generous setting and configuration facilities

• Extended frequency range by frequency tracking and filter adaptation

• Function modular and type tested software

• Transformer differential protection - for two- and three-winding transformers with 2, 3 or more CT groups - Through-fault stability by settable current bias characteristics - Enhanced through-fault stability for multi-breaker arrangements - Inrush restraint with two selectable combinations of waveform and 2nd harmonic methods. Crossblocking between phases - Overexcitation restraint with 5th harmonic - Internal CT ratio and vector group adaptation - Automatic zero sequence quantity elimination

• Three-phase time overcurrent protection with inverse and definite time characteristics. Three protection modules are available. Each of them can be configured to any side of the transformer. Directionality as option

• Restricted earth fault protection for each transformer winding, based on the low impedance principle and also provided with a directional feature

• Earth fault time current protection with inverse and definite time characteristics. Three protection modules are available. Each of them can be configured to any side of the transformer. 2nd harmonic restraining can be chosen if required. Directionality as option

• Single or three-phase definite time or inverse time overvoltage protection for selectable transformer sides. This overvoltage protection is also suitable to apply as neutral voltage protection. Six protection modules are available (SE960158) Transformer protection terminal RET 521*2.1 1MRK 504 012-BEN Issued May 1999 Changed since March 1999 Data subject to change without notice Transformer protection terminal RET 521*2.1 1MRK 504 012-BEN Page 2 Features (cont’d)

• Single or three-phase definite time undervoltage protection for selectable transformer sides. Three protection modules are available

• Overexcitation protection based on V/Hz measurement with IEEE inverse time or transformer adapted characteristic

• Thermal overload protection

• Voltage regulation for single transformer or parallel transformers with on load tap changer

• Programmable logic with inputs and outputs, trip logic, And-, Or-gates and timers for trip and/or indication of external protection features (Buchholz, temperature, etc.)

• Display of service values

• Display of event records

• Continuous selfmonitoring and diagnostics

- Overexcitation restraint with 5th harmonic - Internal CT ratio and vector group adaptation

- Automatic zero sequence quantity elimination

• Three-phase time overcurrent protection with inverse and definite time characteristics. Three protection modules are available. Each of them can be configured to any side of the transformer. Directionality as option

• Restricted earth fault protection for each transformer winding, based on the low impedance principle and also provided with a directional feature

• Earth fault time current protection with inverse and definite time characteristics. Three protection modules are available. Each of them can be configured to any side of the transformer. 2nd harmonic restraining can be chosen if required. Directionality as option

• Single or three-phase definite time or inverse time overvoltage protection for selectable transformer sides. This overvoltage protection is also suitable to apply as neutral voltage protection. Six protection modules are availabl.

• Single or three-phase definite time undervoltage protection for selectable transformer sides. Three protection modules are available

• Overexcitation protection based on V/Hz measurement with IEEE inverse time or transformer adapted characteristic

• Thermal overload protection

• Voltage regulation for single transformer or parallel transformers with on load tap changer

• Programmable logic with inputs and outputs, trip logic, And-, Or-gates and timers for trip and/or indication of external protection features (Buchholz, temperature, etc.)

• Display of service values

• Display of event records

• Continuous selfmonitoring and diagnostics

• Disturbance recording and data storage for presentation on PC

• Front mounted menu driven display with key pad and front port connector for PC

• Remote data communication with 2 ports for station control and station monitoring systems

• Available for 19 inch rack mounting in a panel, surface or flush mounting

• Hardware options: - Additional input/output modules for binary inputs and output contacts, and mA analog inputs - Additional analog input module - Separate Combitest test switch for reliable and safe testing - On/Off switch for dc supply - Mounting details for IP 40 and IP 54

Application:

The numerical transformer terminal RET 521 is designed for fast and selective protection and control of two- and three-winding transformers, auto-transformers, generator-transformer blocks and shunt reactors.

The RET 521 has low requirements on the main Current Transformers and no interposing CTs are necessary.

Flexibility is provided to cover for different applications in form of transformer size, vector groups, system neutral earthing and extension of protection functions according to the user’s preference. The selection of functionality from the modular hardware and software is made according to the requirements for selectivity and reliability in accordance to the user’s preference.

Big and important transformers such as generator-transformer blocks or large network transformers can use two RET 521 and include the modular protection software selectively to obtain redundancy. Smaller transformers and shunt reactors can include the modular software in one RET 521 and can also use the programmable logic to provide trip or indication for external protections (e.g. Buchholz).

Thus providing a very compact design for protection and control. The RET 521 includes setting adaptation to power transformer rating and instrument transformer ratios to allow protection settingsin percent (%), of the power transformer rating, thus facilitating the protection settings to an optimum. The RET 521 is supplied for 2-winding applications and 3-winding applications as indicated below in Fig. 1.

  
 
Our brand:
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【ABB】 I/O Module
【AB】 Module&Touch Screen
【Rosemount】 Transmitter
【Yokogawa】 Transmitter
【Yaskawa】 Servo Drive&Servo Motor
【GE/Fanuc】 IC69 Series PLC
【Mitsubishi】 Servo Drive&Servo Motor
(Modicon,SMC,SICK,NORGREN,Siemens,Ebmpapst etc.)
 
Order Process:
 
1, First, send us the brand, model code/pic of the nameplate, the quantity for inquiry. Then we will send the quote to you. after confirming the model and the quantity, then we will the PI to you.
 
2, You can transfer by Paypal/ Western Union/Trade assurance/ T/T. When we received the payment, then we will start to prepare the order for you asap.
 
3, We can according to your shipment to ship out the goods, Or we also can help you to ship out the goods directly. And the tracking number will send you by the next day.
 
4., Usually for our inventory goods only need to take about 3-5 days.
 
5. If you also have any questions, you can ask me any time, right below is my contact.
 
 
FAQ
* Q: Do you provide a warranty for the goods?
A: Yes, we provide a warranty for all the goods from us.
* Q: Could Wisdomlong provide technology support?
A: We're in this field for more than 8 years. If there's any problem, please contact with us, we'll provide a suggestion from our
engineer to help you solve the problem.
* Q: Does Wisdomlong keep goods in stock or only trading?
A: We have a large warehouse for goods. Keep lots of goods in the warehouse, so could promise a fast delivery.
* Q: What is your MOQ?
A: We provide you small MOQ for each item, it depends on your specific order!
* Q: Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery.
* Q: How do you make our business long-term and good relationship?
A: We keep good quality and competitive price to ensure our customers benefit ;
We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.
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