Beckwith M-0193B synchronous closing device

Beckwith M-0193B synchronous closing device

Product basic information

1. Manufacturer and positioning

Beckwith Electric (Hubbell) M-0193B solid-state automatic synchronization device, the core function is to detect the voltage and frequency difference between the generator/line and bus on both sides of the circuit breaker, accurately predict the zero crossing point, issue the closing command in advance, and achieve synchronous grid connection; Suitable for generator grid connection switches and system interconnection switches, taking into account power plant generator sets and grid interconnection scenarios. It is equipped with M-0194 speed and voltage regulation controller and M-3410A/M-0188 synchronous verification relay to form a complete grid connection system.

2. Core values

Accurately compensating for the inherent closing time of the circuit breaker, closing with zero phase difference under the premise of qualified voltage and frequency difference, significantly reducing grid connected surge current, and protecting the generator and main transformer; Provide safety functions such as multiple locking, anti reverse power generation, anti multiple closing, and manual collaborative windows.

3. Compliance

Immunity standard: Meets ANSI/IEEE C37.90.1 oscillation and fast transient surge tolerance;

Environmental wide temperature industrial grade, single epoxy fiberglass PCB, fully sealed semiconductor components, high-precision instrument grade resistive capacitive components ensure stable measurement.

Electrical input, output, and load parameters

（1） Voltage input (all transformers are isolated and do not interfere with each other)

Generator/Line Voltage (Gen/Line), Bus Voltage (Bus)

Rated at 120Vac, with a long-term withstand voltage of 145Vac and a short-term withstand voltage of 200Vac for 1 second; Single load ≤ 0.5VA@120V ；

Device working power supply: 100-140Vac, maximum load 7VA;

Input isolation: All voltage circuits must withstand a voltage of 1500Vac/1min to ground.

（2） Output circuit

Main contact point for circuit breaker closing

Short time pass of 20A, capable of disconnecting 120Vdc inductive 0.9A and 250Vdc inductive 0.4A;

State auxiliary relay (light load)

Two sets of passive contacts, ∆ V qualified and ∆ F qualified, are used for upper level remote signaling and local indicator lights;

Capacity: 120Vac 1A/125Vdc 0.5A resistive;

The output circuit also has a 1500Vac insulation withstand voltage.

（3） Precision and synchronization core indicators

Voltage limit knob (front panel)

UPPER VOLTAGE LIMITED (upper and lower limits): 110~140Vac, full-scale accuracy ± 1.5%;

LOWER VOLTAGE LIMIT：90~120Vac， Full scale accuracy ± 1.5%;

Differential pressure ∆ V Limit

Standard 1-5V can be optionally extended to 4-20V (when paired with M-0194, 4-20V range must be selected), with an accuracy of ± 5% of full range;

Frequency difference ∆ F Limit

Two range: 0.05~0.5Hz (standard), 0.005~0.05Hz (high-precision selection for large units), accuracy ± 3% of full range;

Extreme resolution: Reliable identification of 0.0005Hz frequency difference, typical equipment can reach 0.0001Hz;

Prediction of Closing Time

The backplane terminal can be programmed with a total closing time of 20-800ms for the circuit breaker; The set value needs to be superimposed with a 20ms delay for the internal relay of the device to engage;

Closing phase error: It increases linearly with frequency difference and closing time. The phase error of the 80ms circuit breaker is less than 0.6 ° at 0.5Hz and less than 1.5 ° at 800ms.

Adjustable knob and status LED on the front panel

1. Four channel voltage setting knob

BUS upper/lower limit voltage, GEN/LINE upper/lower limit voltage: set the allowable voltage range of the busbar and generator respectively, and lock the circuit breaker when it exceeds the tolerance;

2. ∆ V and ∆ F adjustment knobs

Limit the maximum allowable voltage difference and frequency difference separately. When exceeding the standard, the "∆ V OK/∆ F OK" light will turn off and closing is prohibited;

3. Status indicator light (lights up when all conditions are met)

BUS voltage upper limit qualified, BUS voltage lower limit qualified, GEN/LINE upper and lower limits qualified, voltage difference OK, frequency difference OK, whole machine READY ready light; All lights are on to meet the conditions for closing.

Core optional security function module

1. Anti Motoring

Default off, internal dialing enabled;

After activation: Only when the generator frequency is greater than the system frequency (generator fast), can it be closed to prevent the generator from becoming an electric motor and absorbing reverse power after grid connection, protect the turbine blades, and avoid misoperation of reverse power protection;

Close: Both positive and negative slip can be synchronized, reducing the risk of the unit waiting for grid connected temperature rise.

2. Anti Pump

Optional function: The closing output only lasts for 0.5 seconds. After completing one closing, the power must be disconnected for about 10 seconds to reset before closing again;

No such option: Every time the slip crosses the zero point and the conditions are met, the closing command will be repeatedly issued, which can easily cause the circuit breaker to repeatedly close.

3. Operator Window for Manual Collaborative Operations

Allow operators to manually close the contacts and connect them in series with the device logic; The operator must close the operation switch within the adjustable time window (0.2~6.2s) and adjustable phase window (0~30 °/0~180 °, distinguished by frequency difference gear) before the device outputs closing; Lock directly beyond the window and wait for the next slip cycle to retry; Internal potentiometers R160 (phase) and R148 (time) are set, and calculation formulas are provided to assist in on-site settings.

4. M-0194 compatible selection

If you need to link the M-0194 generator speed and voltage regulation controller, you must order this option to adapt to the voltage regulation/acceleration/deceleration pulse output logic.

5. 50Hz power grid version

Standard 60Hz, overseas power grids can choose 50Hz hardware.

Circuit breaker closing time programming logic (backplane TB1 terminal)

Basic gear: TB1-20 common terminal connected to terminals 7-16, corresponding to 20/40/60/80/100/120/140/160/200ms;

Long circuit breaker multiplier terminal (used for>200ms): TB1-5 are respectively connected to 17 (× 2), 18 (× 3), and 19 (× 4) to amplify the total delay;

Multi circuit breaker scheme: Install gold-plated small auxiliary relays, switch different time configurations by switch contacts, and require short shielded twisted pair (<2 feet) wiring;

Key rule: Set value=actual mechanical closing time of circuit breaker+20ms device relay closing delay.

Two typical system matching schemes

Plan 1: M-0193B+M-3410A synchronous verification relay

Double locking: M-0193B predicts zero crossing closing, M-3410A performs maximum phase hard limit to prevent large angle grid connection, and two sets of closing contacts are connected in series to significantly reduce the probability of false closing.

Scheme 2: M-0193B+M-0188 synchronous verification relay

Simplify the verification circuit, suitable for small and medium-sized units. M-0188 is equipped with a phase locking window and connected in series with the device logic to output closing.

Auxiliary supporting M-0194 controller

Automatically output acceleration, voltage reduction/boost pulses before synchronization, pulling the generator voltage and frequency to the synchronization range, simplifying operator adjustment.

Hardware Physics, Environment, and Installation

1. Size specifications

Standard 19 inch rack, height 3.5U (2 rack units), width 48.26cm x height 8.89cm x depth 33.02cm; net weight 6.8kg, transportation 9.1kg;

2. Installation method

Standard horizontal position; Optional vertical and GE GES21A old equipment retrofit panels;

Equipped with a transparent protective cover to prevent the knob from accidentally touching and modifying the set value;

3. Environmental tolerance

Temperature: -40 ℃~+80 ℃, maintain calibration accuracy at all temperatures;

Humidity: up to 95% without condensation; PCB spraying anti mold coating;

The seismic resistance, impact, and earthquake level meet the standards for electrical equipment.

4. Definition of Backboard Terminals

TB1 (28 channels): voltage input, power supply, programming of closing time, enable terminal;

TB2 (A/B): Circuit breaker closing output dry contact.

Self inspection, reliability and safety standards

The whole machine is continuously self checked in the background after being powered on, and the absence of connectors on a single PCB reduces the number of fault points;

The output closing is driven by capacitor energy storage for a short period of time. Once triggered, it cannot be interrupted halfway to ensure the integrity of the closing pulse;

Safety warning: There is a deadly high voltage inside the terminal, only certified electrical personnel can open the cover for maintenance; The cover plate can only be removed after power failure and full discharge;

Anti static requirements: Internal MOS devices, maintenance workbenches, and personnel need to be anti-static; It is prohibited to replace components with electricity.