PCS-9641 / PCS-9631 — high-voltage motor and capacitor bank protection terminals
NR PCS-9641 and PCS-9631 protect, control and monitor two common types of medium-voltage feeders, high-voltage electric motors and shunt capacitor banks. Both are available in the basic version and in the new S generation and work in networks with any neutral mode. The terminals are used in 6–10 kV switchgear of power plants, substations and industrial plants.
- PCS-9641 / 9641S
- protection of induction and synchronous auxiliary motors: differential protection (87M), overcurrent protection, earth fault protection, thermal (49), RTD, prolonged start (48), limit on number of starts (66), underpower, out-of-step (55)
- PCS-9631 / 9631S
- protection of shunt capacitor banks: 4-stage overcurrent protection, current unbalance protection (60), voltage differential protection (87V/87VN), voltage protection, RMS overload
- Recording
- 64 fault oscillograms, 8 motor start oscillograms, 1024 events
- Neutral mode
- all types of neutral earthing
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The PCS-9641 / PCS-9641S protect induction and synchronous motors of pumps, fans, compressors, mills and other auxiliary drives of power plants and industrial plants. The set of functions includes longitudinal motor differential protection (87M), directional and non-directional overcurrent protection, earth fault protection including sensitive earth fault protection, negative-sequence and phase loss protection, breaker failure protection, undercurrent and underpower protection, voltage and frequency protection, and reverse power and out-of-step protection (55) based on power factor.
The motor thermal model (49) is complemented by protection using RTD temperature sensors, supervision of starting time and stalled rotor (48), and restart inhibit (66) when the number of starts per interval exceeds the permitted value. The terminal stores 64 fault oscillograms and 8 motor start oscillograms with start reports, as well as 1024 events. The start reports show how the motor accelerates under load and help to set up the thermal model.
The PCS-9631 / PCS-9631S are designed for static capacitor banks. They provide four-stage overcurrent protection, RMS overcurrent protection accounting for harmonics up to the 11th, six-stage zero-sequence protection and negative-sequence protection. Internal faults of the bank are detected by current unbalance protection (60) with three groups of unbalance currents, as well as phase voltage differential protection (87V) and neutral voltage differential protection (87VN). There are two-stage undervoltage and overvoltage protections, undercurrent protection, thermal protection, breaker failure protection and up to four input channels for process protection signals with or without time delay. Current, voltage, power, energy, frequency and harmonics are measured.
The S version allows wall mounting indoors and outdoors or flush panel mounting and is configured in PCS-Studio. The terminals support IEC 61850-8-1 (MMS, GOOSE) and IEC 61850-9-2 (SV) for the station bus and process bus, IEC 60870-5-103 and Modbus over RS-485 and Ethernet, and the PCS-9631 also DNP3.0. Time synchronisation, trip circuit supervision and a front RJ45 port for setting are provided. Through GOOSE the devices exchange signals without control cables.
Technical specifications
| PCS-9641 / 9641S | protection of induction and synchronous auxiliary motors: differential protection (87M), overcurrent protection, earth fault protection, thermal (49), RTD, prolonged start (48), limit on number of starts (66), underpower, out-of-step (55) |
|---|---|
| PCS-9631 / 9631S | protection of shunt capacitor banks: 4-stage overcurrent protection, current unbalance protection (60), voltage differential protection (87V/87VN), voltage protection, RMS overload |
| Recording | 64 fault oscillograms, 8 motor start oscillograms, 1024 events |
| Neutral mode | all types of neutral earthing |
| Protocols | IEC 61850-8-1, IEC 61850-9-2, IEC 60870-5-103, Modbus |
| S version | wall or flush mounting, PCS-Studio configuration |
Request a price and lead time
PCS-9641 / PCS-9631 — high-voltage motor and capacitor bank protection terminals. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8537 10 98 00 |
|---|---|
| HS, 6 digits | 8537 10 |
| CN (EU) | 8537 10 98 |
| HTSUS (USA) | 8537 10 91 70 |
| China customs tariff | 8537 10 90 90 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
Which motors does the PCS-9641 protect?
Induction and synchronous high-voltage motors of pumps, fans, compressors and mills. The terminal has differential protection (87M), a thermal model with RTD sensors and a limit on the number of starts (66).
How does the PCS-9631 detect faults inside a capacitor bank?
By current unbalance protection (60) with three groups of unbalance currents and by voltage differential protection (87V/87VN). Overcurrent and voltage protections also operate.
How many oscillograms does the motor protection terminal store?
The PCS-9641 stores 64 fault oscillograms and 8 motor start oscillograms. The event log holds 1024 records.
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