GE Vernova MVAJ 05/10/20 series is a tripping and control relay

GE Vernova MVAJ 05/10/20 series is a tripping and control relay

Overall positioning and design of the product

Product ownership and core value: MVAJ 05/10/20 is a tripping and control relay from GE Vernova Grid Solutions. Its core function is to serve as an intermediate interface between protective relays and circuit breakers, solving the problem of insufficient contact capacity of protective relays. At the same time, it provides additional contacts, control, signal indication, and interlocking functions for multiple circuit breaker tripping, which can directly drive the circuit breaker tripping coil.

Core design: Adopting articulated armature structure, with high manufacturing standards, high reliability and flexibility; The contact bounce of the product can be ignored, and it is resistant to wiring capacitor discharge, avoiding misoperation caused by capacitor discharge during faults.

Market performance: The MVAJ series was first launched in 1984 and upgraded to 05/10/20 models in 1999, with a cumulative delivery of over 16000 units (first generation)+10000 units (upgraded models)=26000 units, indicating mature applications.

Product Category

Trip relay: standard manual reset flag, fast action speed (<10ms), suitable for core scenarios of circuit breaker tripping;

Control relay: a derivative of the trip relay, with an action speed of about 15ms, equipped with a follow-up flag, which can intuitively display the armature status and is suitable for control scenarios without strict requirements for action time.

Core model and configuration parameters

Model and Contact/Shell Correspondence: Divided into three types based on the number of contacts, the shell is compatible with the Midos standard, and the core correspondence is as follows:

|Model | Contact Quantity | Shell Specification | Core Action Time (Standard Flag)|

|MVAJ 05 | Route 5 | No.2 | ＜ 8ms|

|MVAJ 10 | Route 10 | No.2 | ＜ 8ms|

|MVAJ 20 | Route 20 | No. 4 | ＜ 10ms|

Reset mode and model variants: The entire series supports 5 reset modes, with different contact numbers corresponding to different variant models. The 2.5s delayed self reset is only provided by MVAJ 102, and the core correspondences are as follows:

|Reset mode | 5 contacts (05) | 10 contacts (10) | 20 contacts (20)|

|Self reset | 051 | 101 | -|

|2.5s delay self reset | - | 102 | -|

|Manual reset | 053 | 103 | 203|

|Electric reset | 054 | 104 | 204|

|Manual+Electric Reset | 055 | 105 | 205|

Rated voltage and operating range: Supports 5 levels of rated DC voltage, with a wide operating range for each level, suitable for different industrial power sources. The parameters are as follows:

|Rated voltage (Vx) | Operating voltage range (V)|

| 24/27* | 14.4 – 32.4 |

| 30-34* | 18.0 – 40.8 |

| 48/54* | 28.8 – 64.8 |

| 110/125 | 66 – 150 |

| 220/250 | 132 - 300 |

Note: Low load configuration supports AC/DC, high load configuration only supports DC

Core load configuration and switching

The product comes standard with a high load configuration, which can be flexibly switched to low load by removing external terminal links. The two configurations are suitable for different scenarios, and the core differences and switching methods are as follows:

Switching method: Remove the external link between terminals 22 and 24 to switch from high load to low load; MVAJ 102 is an exclusive delay model that only supports high loads and does not require link switching.

High load configuration

Working mode: DC only operation, with reset suppression function, high load scenarios can choose 40-60ms delay to disconnect the load;

Core features: Strong resistance to wiring capacitor discharge and insensitivity to capacitor discharge current in the early stages of battery wiring grounding faults;

Adaptation scenarios: high safety level circuit breaker tripping circuits, distributed tripping circuits, and scenarios where the triggering contacts are far away from the relay; It can also be used in conjunction with MVAX 11 monitoring relays to adapt to scenarios with wiring risks.

Low load configuration

Working mode: Both AC and DC can operate, with instantaneous load shedding and no delay;

Core features: Simple configuration, lower power consumption;

Adaptation scenario: Conventional control/tripping scenarios where the trigger contact is close to the relay.

Load disconnection characteristics: When the load is disconnected, the power consumption of the relay will decrease to an economic level or be completely cut off (0 power consumption), and the disconnection delay varies for different models:

MVAJ 05: High load instantaneous disconnection, low load instantaneous disconnection;

MVAJ 10/20: High load 40-60ms delayed disconnection, low load instantaneous disconnection;

Before disconnection, the high load will be reduced to about 100W to ensure reliable operation of the series auxiliary components.

Working principle of relays with different reset modes

Self resetting relay (051/101)

Core design: residual gap is set in the magnetic circuit to ensure automatic reset after the trigger signal is removed;

Working process: After the protection contact is triggered, the series resistor is cut in to reduce power consumption and maintain the suction state; After the trigger signal is disconnected, the economic power consumption is cut off and the relay is reset;

Adaptation scenarios: Trip relay and general signal indication scenarios for automatic reclosing schemes.

2.5s delay self resetting relay (102)

Exclusive function: The only model that supports a 2.5-second delayed reset and can receive instantaneous/continuous trigger signals. When triggered continuously, the trip signal is "trigger duration+2.5s";

Working process: After the trigger signal is disconnected, terminal 25 keeps the relay engaged, the circuit board timer starts, and resets after a delay of 2.5 seconds;

Core adaptation: The high and low voltage circuit breakers of large three-phase transformers are interlocked to solve the problems of faster tripping of high voltage circuit breakers and insufficient tripping signals of low voltage circuit breakers.

Manual reset relay (053/103/203)

Core design: Connect the armature coil in series with internal normally broken contacts, cut off the coil circuit after action, and reduce the load to 0;

Reset method: Manually reset through the button on the front cover of the relay. MVAJ 20 is a dual element and needs to be reset separately;

Adaptation scenario: Transformer related circuit breakers trip and are used as effective locking relays.

Electric/Manual+Electric Reset Relay (054/055/104/105/2004/205)

Working process: Similar to manual reset relays, electric reset requires applying voltage to the reset coil; After the manual and electric reset models are engaged, the internal contacts close to activate the reset circuit;

Reset suppression: Connecting terminals 21 and 23 can activate reset suppression to prevent false triggering of the reset circuit when the operating circuit is powered on, and to avoid oscillation of the relay between suction/reset;

Adaptation scenarios: automatic reclosing scheme, tripping/control scenarios that require remote reset.

Key electrical performance and durability

Contact rated capacity: The contact has excellent on/off and load-bearing capacity, with clear distinction between AC/DC operating conditions. The parameters are as follows:

|Working conditions | 3-second closed load | continuous closed load | breaking capacity|

| AC | 7500VA（≤30A/300V） | 1250VA（≤5A/300V） | 1250VA（≤5A/300V） |

|DC | 7500W (≤ 30A/300V) | 1250W (≤ 5A/300V) | 80W resistive/40W inductive (≤ 5A/300V)|

Capacitor discharge tolerance: Core anti-interference characteristics, different load configurations have different tolerance capabilities to avoid capacitor discharge misoperation:

High load: ≤ 125V model can withstand 10 μ F capacitor (120% rated voltage) discharge; 220/250V model can withstand 10 μ F capacitor discharge (100% rated voltage, 275V);

Low load: withstand discharge of 1 μ F capacitor (120% rated voltage).

Durability: The mechanical and electrical lifespan of the contacts is long, meeting the long-term operational needs of industry

Load contact: ≥ 10000 operations;

No load contact: ≥ 100000 operations.

Reset time: Fast reset speed, suitable for industrial scenarios with fast reset:

Self reset: 20ms for 051/101;<20ms for 110/125V/220/250V high load 051 after installing diode;

Electric reset: ＜ 15ms;

MVAJ 102: approximately 2.5s delayed reset.

Flag type and ordering requirements

Flag type: divided into two types, suitable for different scenarios of tripping/control, directly affecting the action time:

Standard manual reset flag: standard for all trip relays, drops after action, remains in action after reset, indicates fault occurrence, and does not increase action time;

Follow up flag: Control the relay as standard, with armature suction/reset action, intuitively displaying the current status of the relay, with an action time increased to 15ms, not suitable for tripping scenarios.

Essential information for ordering: When placing an order, it is necessary to provide 8 core information items, including model, configuration, specifications, etc. Specifically:

① Relay model (MVAJ); ② Contact number (05/10/20); ③ Reset mode (1/2/3/4/5); ④ Shell specifications (R/T); ⑤ Flag type (A/B); ⑥ Rated voltage (00/02/05/08/10); ⑦ Output contact combination (CC); ⑧ Design suffix.