ABB SPAU 341 C On Load Voltage Regulating Controller

ABB SPAU 341 C On Load Voltage Regulating Controller

Whole machine SPAU 341C

1. Core functions

Automatic/manual output of RAISE and LOWER pulses to drive the on load tap changer;

Overcurrent lockout, undervoltage lockout, and overvoltage fast drop;

Line voltage drop compensation LDC, compensating for resistive and inductive voltage drop of transmission lines;

Three parallel voltage regulation modes: master-slave mode, negative reactance mode, and minimum circulating current mode;

Tap changer gear measurement (0-20mA current signal input);

Digital display of set values, measured voltage and current, and alarm status;

SPA fiber optic serial bus communication, supporting upper computer parameter reading and writing, event uploading;

Continuous self-monitoring of software and hardware for IRF fault alarm output.

2. Hardware architecture

The whole machine chassis is plug-in modular, including:

U1: Automatic voltage regulation module SPCU 1D50 (mandatory)

U2: Manual voltage regulation module SPCN 1D56 (optional, models are divided into C1 with manual module, C3 basic version without manual module)

Power module: choose one from two

SPGU240 A1：80‑265V AC/DC

SPGU48 B2:18-80V DC

I/O module SPTR 6B32: all relay outputs, external switch inputs, serial port interfaces;

Motherboard: distributes power and signals;

The SPA-ZC series bus adapter is used for fiber optic buses, and the parallel loop mode requires SPA-ZC100.

3. Wiring terminals (backplate X0/X1/X2)

X0: CT current input 1A/5A; PT voltage input 100/110/120V; auxiliary working power supply, protective ground;

X1: External manual/automatic command, RSV voltage reduction input, tap changer gear mA input, TCO tap changer action feedback;

X2: Rising/falling relay output; Overcurrent, undervoltage, manual/automatic status, IRF self-test fault relay output; External locking input.

Communication: 9-pin D-SUB serial port connected to SPA-ZC fiber optic conversion module; SPA-ZC17/21 is used for ordinary buses; SPA-ZC100 is dedicated to the minimum circulating current parallel mode.

4. Main technical parameters

PT：Un=100/110/120V，50/60Hz；

CT: 1A or 5A; complete indicators for thermal stability and dynamic stability impulse current;

Output relay: 250V AC/DC, continuous 5A;

Power consumption: static 10W, working 15W;

Environment: -10 ℃~+55 ℃ for operation, -40~+70 ℃ for storage and transportation; Panel installation protection IP54; The total weight of the machine is 5.5kg;

EMC meets the IEC60255-22 series insulation withstand voltage standards;

The communication baud rate can be selected as 4800/9600 Bd, ASCII encoding.

5. Voltage regulation control logic

User set reference voltage (U_2 );

Control voltage (U_p=U_2 ± U_z ± U_ {ci} - U_ {rsv} );

(U_z ): Line voltage drop compensation (U_ {ci} ): Circulation compensation (U_ {rsv} ): RSV load reduction and voltage reduction;

Bandwidth ( Delta U_2 ): When the measured voltage (U_m ) falls within the bandwidth, the regulator does not operate;

When U_m exceeds the bandwidth, start the first delay T1; continue to exceed the limit until T1 time, output up/down pulses;

If the voltage still exceeds the limit after one adjustment, start the second delay T2 (usually shorter than T1);

T1/T2 supports timed and inverse time characteristics: the larger the voltage deviation, the shorter the delay;

The lag coefficient is set to 90% of the bandwidth at the factory, and the delay timer is reset when entering the lag zone.

6. Locking protection function

Undervoltage lockout U<: Automatic voltage regulation is locked when the voltage is too low, and manual voltage regulation is still allowed;

Overcurrent lockout I>: Overcurrent lockout voltage regulation to prevent the tap changer from switching at high currents; Manual operation is prohibited during overcurrent;

External lockout BLOCK: The external contacts are fully locked for voltage regulation; Software can switch to remote/local input switching;

Overvoltage detection U>: If the voltage exceeds the standard, output a quick downshift command and prioritize reducing the voltage.

7. Three parallel operation modes of transformers

Mode characteristics, quantity limitations, wiring requirements

Measure with one main regulator in master slave mode, followed by the others; Suitable for hard wiring between transformers with consistent parameters and unlimited regulators, with the main output connected to the slave input

Negative reactance mode does not require inter device wiring; Relying on setting the load phase angle; Can be used in remote substations without any upper limit or connection between devices; Relying on current phase compensation

The minimum circulating current mode exchanges current phase data of each transformer through the SPA-ZC100 fiber optic bus, calculates circulating current, and adapts to up to 3 transformers of different capacities. It is necessary to configure the SPA-ZC100 bus module and allocate device addresses 10/20/30

The parallel mode can be switched through three methods: panel buttons, external switch values, and remote communication.

8. Line voltage drop compensation LDC

Compensate for line voltage drop through parameters Ur (resistance voltage drop% Un) and Ux (reactance voltage drop% Un), supporting both single machine and parallel operating conditions; Parameters can be calculated theoretically or obtained through on-site measurement of line voltage drop; When the tide reverses, the compensation direction automatically reverses.

9. RSV voltage reduction function (reducing the set voltage)

Used for load shedding, the two-stage voltage reduction input RSV1/2 (half reduction) and RSV1/1 (full reduction) can reduce the rated voltage by up to 9%; Can be triggered by external contacts.

10. Installation, startup, debugging, and maintenance

Panel embedded installation, can be equipped with height increasing frame SPA-ZX301/302/303 to reduce cabinet installation depth;

The terminal wire diameter has specifications; Shell with sealing gasket IP54;

Check PT/CT phase sequence, up/down output, TCO feedback, and gear mA input calibration before commissioning; T1/T2 initial recommendation is 60s/30s; Set the initial stability parameter of parallel mode to be small;

Almost maintenance free under normal operating conditions; Regular appearance dust removal in harsh environments; After replacing the I/O module, the mA gear input must be recalibrated for gear measurement;

The spare parts list includes power modules, I/O modules, various functional modules, and various fiber optic bus adapters.

11. Ordering code

SPAU341 C1: equipped with SPCN1D56 manual module; C3: Basic version without manual module; The suffix AA/CA/DA/FA distinguishes between frequency 50/60Hz and power supply voltage range.

SPA-ZC100: divided into plastic fiber BB and glass fiber MM, pre configured with 1 #/2 #/3 # slave station addresses.

SPCU 1D50 Automatic Voltage Regulating Module (U1)

It is the automatic control core of the device, with manual number 1MRS 750111-MUM EN.

Panel: digital tube+LED indicator light, can view: reference voltage Us, bandwidth Δ Us, delay T1/T2, overcurrent I>, undervoltage U<, overvoltage U>, compensation Ur/UX, parallel status, output OUT indicator light; RESET/STEP, PROGRAMME, AUT/MAN, PARALLEL buttons.

Menu system: main menu+multi-level submenus; Support panel buttons and remote communication reading and writing parameters;

Key parameters:

Reference voltage for Us: 0.850-1.150 × Un;

Δ Us bandwidth: 0.60-9.00% Un;

T1、T2：0‑300s， Support inverse time limit;

I>overcurrent threshold, U<undervoltage threshold, U>overvoltage threshold;

Voltage drop compensation coefficient for Ur and Ux lines;

RSV voltage reduction value 0-9%; Int transformer rated current, Int/Int CT ratio coefficient;

Stability coefficient (parallel mode gain);

OPD output pulse duration 0.5-10s; load phase angle (used in negative reactance mode).

Software switch group SGF1, SGF2: Through verification and configuration functions: select parallel mode, current acquisition phase, interlock function on/off, remote local switching, timed/inverse time limit, PT rated voltage selection, external input function redefinition.

Measurement data: three-phase current, phase to phase voltage, voltage deviation Ud, load phase angle;

signal communication:

Event codes E1-E54, which alarm events should be uploaded for event mask configuration;

The parameters are divided into I-input quantity, S-set parameters, and V-control parameters; Password V160 is required to unlock remote parameter writing;

Module address and baud rate can be set; EEPROM saves parameters without loss in case of power failure;

Fault codes: ROM/RAM/EEPROM, AD converter failure, etc; If the IRF light is on, it indicates a permanent fault in the module and the output is locked.

Inverse time limit formula: (t= frac {T} {2 ^ {(U-d/ Delta U_st-1)} ), with a minimum action time forced to be 1 second.

SPCN 1D56 Manual Voltage Regulating Module (U2, optional)

Manual number 1MRS 750112-MUM EN, providing local manual tap changer operation.

Panel: Position POS display; IRF malfunction; I> /U/BLOCK lock indicator light; RESET STEP、PROGRAM； Up and down operation buttons, MAN manual mode indicator light;

Function: Local panel manual up and down tap changer; The 0-20mA gear signal input must calibrate the mA gear correspondence between high and low points; Record the highest and lowest gears;

Logic: overcurrent lockout prohibits manual operation; Under voltage, over-voltage, and external over-voltage alarms are only alarms and still allow manual operation; TCO input detection tap changer action status;

Parameters: high and low gears, corresponding mA values, OPD pulse duration, software switch SGF1;

Communication: Event encoding, I/S/V parameters, password protection; EEPROM saves files and settings; The fault code system is similar to the automatic module.

D-type relay module (1MRS 750066MUM EN)

Introduce the general human-machine interface operation specifications for the entire D-series plugin module:

Panel: 1 red register address digit+3 green data digits; The two buttons, RESET/STEP and PROGRAMM, are pressed;

Operation process: main menu browsing, entering sub menus, entering settings mode, modifying parameters, storing parameters;

Software switch SGF/SGB/SGR: No physical dialing code, relying on setting bit combination checksum;

Trip test mode: Force drive output relay, debug and verify wiring;

5-minute no button automatic screen shutdown;

Dual backup non-volatile EEPROM stores all parameters, automatically switches to backup in case of any damage;

IRF self-monitoring fault: detects CPU, ROM, RAM, EEPROM, fault lights up red, outputs fault relay; Fault code format: red number 1+green fault number;

Communication basics: Register 0, Register A (address, baud rate, password); Event log buffer.