ALSTOM MVAJ1L1GB0771B Auxiliary Transmission Relay

ALSTOM MVAJ1L1GB0771B Auxiliary Transmission Relay

Product Overview

MVAJ1L1GB0771B auxiliary transmission relay is mainly used for auxiliary protection and control of power transmission systems. It can accurately receive various signals, and through complex internal logic operations and processing, quickly respond, thereby achieving effective control and protection of power equipment. In the power transmission network, whether it is substations, transmission lines, or various types of power users, this relay can play an indispensable role.

Performance parameters

Rated voltage: Supports multiple common rated voltage specifications, such as 24V DC, 48V DC, 110V DC, 220V DC, etc., to meet the needs of different power systems. This multi voltage specification design enables the relay to be widely used in various occasions, whether it is small power equipment or large power engineering, suitable voltage matching can be found.

Action voltage: The action voltage is usually lower than a specific value of the rated voltage, which ensures that the relay can operate accurately when the voltage fluctuates. For example, when the voltage of the power system drops slightly but remains within the normal fluctuation range, the relay will not malfunction; When the voltage drops to the threshold that affects the normal operation of the equipment, the relay can quickly respond and perform corresponding protective actions.

Reset voltage: The reset voltage is lower than a specific value of the sustain voltage. After the fault is resolved and the power system returns to normal, the relay can quickly reset under appropriate voltage conditions, preparing for the next possible task and ensuring the continuous and stable operation of the power system.

Contact type: It has multiple sets of normally open (NO) or normally closed (NC) contacts, and the specific configuration depends on different application scenarios and customer needs. Normally, normally open contacts are in an open state and close when the relay is activated; Normally closed contacts are the opposite, closed normally and open when the relay is activated. This flexible contact configuration enables relays to meet the requirements of different control logics, such as starting devices, stopping devices, and sending signals.

Contact capacity: With high breaking capacity, it can reliably drive loads such as circuit breaker trip coils. When a fault occurs in the power system, the powerful contact capacity ensures that the relay can quickly cut off the fault current, protect the power equipment from damage, and ensure the safe and stable operation of the power system.

Response time: The response time is extremely short, usually in milliseconds. In the rapidly changing power system, fast response time is crucial. When an abnormal signal is detected, the relay can react in a very short time, execute protective actions in a timely manner, and minimize the impact of faults on the power system.

Power consumption: Extremely low power consumption, meeting the requirements of modern power systems for energy conservation and efficiency. Low power design not only reduces energy consumption, but also reduces the heating problem of the relay itself, improving the reliability and service life of the equipment.

Insulation strength: meets relevant insulation standards and can effectively prevent electrical short circuits and leakage problems. In complex power environments, good insulation performance ensures the stable operation of relays, avoiding equipment failures and safety accidents caused by poor insulation.

Working temperature: The working temperature range is -25 ° C to+70 ° C, which can adapt to various harsh working environments. Whether in cold northern regions, hot southern regions, or in high-temperature industrial environments or low-temperature outdoor environments, this relay can work normally to ensure the stable operation of the power system.

Application Fields

Transmission line protection: In the distance protection and directional overcurrent protection schemes of transmission lines, the MVAJ1L1GB0771B relay receives the tripping signal of the protection relay and quickly drives the line circuit breaker to quickly cut off the fault. For example, when a short circuit fault occurs in a transmission line, the relay can detect the fault signal within milliseconds and transmit the trip signal to the circuit breaker, causing the circuit breaker to quickly cut off the faulty line, prevent the fault from expanding, and ensure the safe operation of the transmission line.

Transformer protection: In differential protection, overcurrent protection and other protection schemes for transformers, this relay is used to drive the transformer circuit breaker to trip and isolate transformer faults. When faults such as winding short circuit and overload occur inside the transformer, the relay can respond promptly by driving the circuit breaker to trip, isolating the faulty transformer from the power system and protecting the transformer and other equipment from further damage.

Generator protection: Among various protection schemes for generators, MVAJ1L1GB0771B transmits the tripping command of the protection relay to the generator outlet circuit breaker to achieve fault removal. When internal faults occur in the generator, such as stator winding short circuit, rotor grounding, etc., the relay can quickly act to trip the generator outlet circuit breaker, protecting the safe operation of the generator and avoiding serious impact on the power system.

Bus protection: In schemes such as bus differential protection, this relay is used to drive circuit breakers related to faulty bus segments to trip. The busbar is an important part of the power system for collecting and distributing electrical energy. Once the busbar fails, the consequences can be unimaginable. The MVAJ1L1GB0771B relay can quickly respond to bus faults by driving the corresponding circuit breaker to trip and isolate the faulty bus section, ensuring the stable operation of the entire power system.

Motor protection: In the protection circuit of large motors, the relay receives the tripping signal of the protection relay, drives the motor circuit breaker to trip, and protects the motor. When the motor experiences faults such as overload, stalling, and phase loss operation, the relay can detect abnormal signals in a timely manner and quickly perform tripping operations to protect the motor from damage and extend its service life.

Product advantages

Extremely low burden: The design goal is to minimize the current demand on the drive circuit, thereby reducing the burden on the output contacts of the front-end protection relay, extending its service life, and improving the reliability of the system. In the power system, the output contacts of the front-end protection relay need to operate frequently, which imposes a heavy burden. The low load characteristic of MVAJ1L1GB0771B relay effectively reduces the wear on these contacts and lowers the probability of faults occurring.

High reliability: Using high-quality components and mature designs, ensuring reliable operation under various operating conditions, executing trip instructions, and ensuring the safety of the power system. As a well-known enterprise in the industry, ALSTOM strictly controls the quality of its product manufacturing process, selects high-quality components, and has undergone extensive experiments and practical operation verification, making the relay highly reliable and capable of stable operation in complex and harsh power environments.

Quick response: With extremely fast action speed, it can quickly drive the circuit breaker to trip upon receiving a trip signal, minimizing the duration of the fault. Every second, even every millisecond, is crucial when a power system failure occurs. The fast response characteristic of this relay can timely cut off the fault current, reduce the degree of equipment damage, and minimize the impact on the stability of the power system.

Multi contact output: Provides multiple sets of normally open or normally closed contacts, which can simultaneously drive multiple circuit breaker trip coils or be used for signal indication, improving the flexibility of the system. In some complex power systems, it may be necessary to simultaneously control multiple devices or emit multiple signals. The multi contact output function of MVAJ1L1GB0771B relay can meet the diverse control requirements, making the design and operation of power systems more flexible and efficient.

Strong anti-interference ability: It has good anti-interference ability and can work stably and reliably in complex power system environments. There are various sources of electromagnetic interference in the power system, such as the starting of large motors and frequent switching of switches. This relay effectively resists electromagnetic interference through special design and technology, ensuring its normal operation and avoiding misoperation caused by interference.

Multiple rated voltage options: Provides multiple DC rated voltage specifications to meet the needs of different power systems. Different power systems may use different voltage levels, and the multi rated voltage design of this relay enables it to be widely used in various power systems without the need for complex voltage conversion, reducing system costs and complexity.