PCS-9400 — digital excitation systems for synchronous generators, 100–7000 A
NR PCS-9400 are microprocessor-based excitation systems for synchronous generators with an excitation current from 100 to 7000 A and a voltage from 100 to 700 V. They improve the quality of generator regulation and reduce maintenance costs. They suit turbo and hydro generators of power plants of various ratings, including 600 MW units.
- Excitation current
- 100–7000 A
- Excitation voltage
- 100–700 V
- System types
- PCS-9400A self-excitation (static); 9400B two-machine; 9400C three-machine with a transformer; 9400D brushless; 9400E with a DC exciter
- AVR PCS-941X
- 2 or 3 channels, PowerPC + DSP + FPGA, PID + PSS, limiters, HMI with LCD
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The system feeds current into the rotor winding, creates the magnetic field and keeps the generator voltage in steady-state and transient conditions of the power system. It is supplied with PID regulation and a power system stabilizer PSS, with optimized and adaptive control laws, and is configured to project requirements. The supported schemes are static self-excitation (PCS-9400A), independent two-machine (PCS-9400B), three-machine with a transformer (PCS-9400C), brushless (PCS-9400D) and with a DC exciter (PCS-9400E), with one or two excitation sets per generator.
The system keeps the terminal voltage as the load changes, shares reactive power between generators operating in parallel, and improves static, dynamic and transient stability. In case of internal generator faults it de-excites the field, and it also limits maximum and minimum excitation. The composition includes the digital excitation regulator PCS-941X, the thyristor rectifier PCS-9420, the diode rectifier PCS-9421, the field suppression device PCS-943X and the auxiliary cabinets PCS-944X.
The regulator is available with two or three channels, each channel independent and running on a PowerPC, DSP and FPGA platform. It implements PID + PSS, various regulation laws, droop, and limiters for underexcitation, overexcitation, false forcing, peak current and V/Hz. Protection against overvoltage at no load and against VT circuit faults, self-diagnostics, an oscilloscope and an event recorder are provided. Local control and parameter viewing are performed through an HMI with an LCD.
Thyristor rectifiers are made for 250, 800, 1200, 1800, 2400 and 3000 A, and diode rectifiers for 1800, 2400 and 3000 A. The cabinets operate in parallel without switching, with a current sharing coefficient above 0.9. Cooling is by air, with aluminum or heat pipe heat sinks. The field is suppressed with a linear or nonlinear resistor and a breaker with magnetic arc extinction.
The firing angle resolution is 0.00045°, the ADC is 16-bit, and AC is measured directly at 72 points per period. The regulator executes 4000 regulation cycles per second, that is one cycle takes 0.25 ms, the setpoint range is 10–130 % of rated voltage, the response time is less than 0.1 s, and the frequency range is 5–1000 Hz. Communication runs over Ethernet, optical links and RS-232/RS-485.
Technical specifications
| Excitation current | 100–7000 A |
|---|---|
| Excitation voltage | 100–700 V |
| System types | PCS-9400A self-excitation (static); 9400B two-machine; 9400C three-machine with a transformer; 9400D brushless; 9400E with a DC exciter |
| AVR PCS-941X | 2 or 3 channels, PowerPC + DSP + FPGA, PID + PSS, limiters, HMI with LCD |
| Rectifiers | PCS-9420 thyristor: 250/800/1200/1800/2400/3000 A; PCS-9421 diode: 1800/2400/3000 A; current sharing coefficient > 0.9 |
| Field suppression | PCS-943X: linear/nonlinear resistor, breaker with magnetic arc extinction |
| Regulation | 10–130 % Ugn, 4000 cycles/s (0.25 ms), response < 0.1 s |
| Measurement | direct AC measurement, 72 points per period, 16-bit ADC |
| Firing angle resolution | 0.00045° |
| Frequency band | 5–1000 Hz |
Request a price and lead time
PCS-9400 — digital excitation systems for synchronous generators, 100–7000 A. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8504 40 82 00 9032 89 00 00 |
|---|---|
| HS, 6 digits | 8504 40 |
| CN (EU) | 8504 40 82 9032 89 00 |
| HTSUS (USA) | 8504 40 95 80 9032 89 00 00 |
| China customs tariff | 8504 40 99 99 9032 89 90 90 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
What excitation currents and voltages is the PCS-9400 designed for?
Excitation current from 100 to 7000 A, voltage from 100 to 700 V. This is enough for turbo and hydro generators, including 600 MW units.
What excitation schemes are supported?
Static self-excitation PCS-9400A, two-machine PCS-9400B, three-machine with a transformer PCS-9400C, brushless PCS-9400D and with a DC exciter PCS-9400E.
How fast is the regulator?
The regulator executes 4000 cycles per second, with a response time of less than 0.1 s. The firing angle resolution is 0.00045°.
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