ABB SPAU 341 C Voltage Regulator

ABB SPAU 341 C Voltage Regulator

Product basic positioning and core functions

1. Product positioning

Application scenario: Designed specifically for on load tap changers in distribution substations, the secondary voltage of the transformer is regulated by controlling tap changers to ensure stable load voltage and adapt to 50/60Hz power grids;

Core value: Supports independent voltage regulation of a single transformer and parallel operation of multiple transformers, with functions such as line voltage drop compensation, overcurrent/undervoltage lockout, overvoltage detection, etc., to meet the stability requirements of industrial power supply;

Module composition: It consists of an automatic voltage regulation module (SPCU 1D50), a manual voltage regulation module (SPCN 1D56), a power module (SPGU 240 A1/SPGU 48 B2), an I/O module (SPTR 6B32), and a motherboard. It supports fiber optic serial bus communication (requires SPA-ZC series bus modules).

2. Core Function List

Functional categories, specific abilities, and application value

Voltage control with automatic/manual dual-mode voltage regulation, adjusting the voltage to adapt to load changes through the "Raise/Lower" signal of the tap changer, and maintaining stable secondary voltage

Compensation function circuit voltage drop compensation (U ₐ), compensating for voltage loss caused by circuit resistance (R) and reactance (X) to ensure that the voltage at the remote load end meets the standard, avoiding high near end voltage/low far end voltage

Protection lockout overcurrent lockout (I>), undervoltage lockout (U<), overvoltage detection (U>), external lockout input prevents the tap changer from operating in fault states (such as short circuit, abnormal voltage), extending equipment life

Parallel operation supports three parallel control principles: Master/Slave, Negative Reaction, and Minimizing Circulating Current. When multiple transformers supply power to the same bus, they balance the load and circulating current to avoid equipment overload

Real time self inspection of self-monitoring hardware/software, triggering IRF (Internal Relay Fault) alarm in case of failure, blocking output to improve system reliability, and reducing the risk of fault expansion

Data exchange with digital display of set/measured values, RS485 serial interface, fiber optic bus communication for convenient on-site debugging and remote monitoring, compatible with substation automation systems

Core working principle and key parameters

1. Voltage regulation core logic

Control voltage calculation: The controller calculates the target control voltage (U ₚ) through "reference voltage (U ₛ) ± line voltage drop compensation (U_z) ± circulating current compensation (U_ci) - set voltage drop (U_rsv)", and the formula is:

Uₚ = Uₛ ± U_z ± U_ci - U_rsv

Adjustment trigger mechanism:

Compare the measured voltage (U ₘ) with the control voltage (U ₚ). If U ₘ exceeds the "bandwidth (∆ U ₛ)" range (default ± 1.5% U ₙ), initiate the first delay (T1, default 60s);

If U ₘ still exceeds the hysteresis range (∆ U ₕ, default 90% ∆ U ₛ) during the delay period, the tap changer will be triggered;

If a single action does not cause U ₘ to return to bandwidth, initiate the second delay (T2, default 30s) and repeat the adjustment until the voltage meets the standard;

The delay feature supports both "definite time limit" and "inverse time limit" (the delay is inversely proportional to the voltage deviation, and the larger the deviation, the shorter the delay).

2. Key technical parameters (core indicators)

Specific specifications for parameter categories

Voltage input rated voltage U ₙ: 100V/110V/120V (line voltage), continuous withstand voltage 2U ₙ, power consumption<0.5VA, suitable for different regional power grid rated voltages

Current input rated current I ₙ: 1A/5A (optional), 1A model can withstand 4A and 25A continuously for 10 seconds; 5A model can withstand 20A and 100A continuously for 10 seconds, compatible with current transformers (CT) of different transformation ratios

Output contact adjustment contact (Raise/Power): 250V AC/DC, continuous 5A, 0.5s on-off 30A; signal contact (lockout/alarm): 250V AC/DC, continuous 5A, compatible with tap changer drive circuit and alarm circuit

Power module SPGU 240 A1: 80~265V AC/DC (compatible with 110/230V mainstream voltage); SPGU 48 B2: 18~80V DC (compatible with low-voltage DC system) to meet different substation power configurations

Environmental adaptability: working temperature -10~+55 ℃, storage temperature -40~+70 ℃, humidity 5%~95%, non condensing, protection level IP54 (embedded installation), suitable for industrial harsh environment, dustproof and splash proof

Communication capability: Fiber optic serial bus, ASCII encoding, speed 4800/9600 Bd, supports SPA-ZC series modules (SPA-ZC 17/21 for plastic fiber optic and SPA-ZC 17 MM/21 MM for glass fiber optic) to achieve data exchange among multiple regulators, supports parallel operation and remote monitoring

Core configuration and operation process

1. Key configurations before installation (mandatory steps)