NR Electric PCS-9626D Operating Circuit Plug-in NR4542A

1. The PCS-9626D Motor Protection is a protection, measurement, and control device suitable for medium and high voltage motors at 3-10KV voltage levels. It can be installed in panels or locally in switchgear cabinets. The device collects analog quantities through conventional electromagnetic transformers and supports the IEC61850 protocol.
Protection Functions
The PCS-9626D provides protection functions including: Short-circuit protection, prolonged starting and stalling protection: three-stage definite-time overcurrent protection? Unbalance protection (including phase failure and reverse phase): two-stage definite-time negative-sequence overcurrent protection, one-stage negative-sequence overload alarm, with the negative-sequence overcurrent stage II optionally using inverse-time characteristics? Overload protection? Overheating protection: divided into overheating alarm and overheating trip, with thermal memory and restart prohibition functions, displaying the motor's thermal accumulation in real-time? Grounding protection: zero-sequence overcurrent protection? Zero-sequence overvoltage protection? Overvoltage protection
Undervoltage protection? Three non-electrical protection circuits? Independent operating circuit and fault recording. Additionally, it includes the following abnormal alarm functions:? CT open-circuit alarm? PT open-circuit alarm? Overload alarm? Negative-sequence overload alarm? Zero-sequence overcurrent alarm? Non-electrical quantity alarm? Grounding alarm

1.2.2 Measurement and Control Functions

1) 12 custom remote signaling inputs.

2) One circuit breaker open/close control.

3) 13 telemetry quantities including Iam, Ibm, Icm, UA, UB, UC, UAB, UBC, UCA, F, P, Q, ф.

4) Optional 2 channels of 4～20mA analog output for interfacing with DCS current and active power measurement.

5) Event SOE recording, etc.

6) Motor start report recording function.

Working Principle

Protection information functions? Remote viewing of device description.? Remote viewing of equipment parameter settings.? Remote viewing and modification of protection settings and zone numbers.? Remote viewing, activation, and deactivation of soft壓板 status.? Remote viewing of device protection input status.? Remote viewing of device operating status (including the status of protection action elements and self-test alarm information, etc.).? Remote reset of device signals.? Fault recording upload function. Supports IEC-61850 communication protocol, DL/T667-1999 (IEC60870-5-103) protocol, Profibus DP communication protocol, and is equipped with Ethernet communication (100Mbps, **Category 5 cable or fiber optic communication interface).

The main program receives sampling interrupts at the given sampling cycle to enter the sampling program. In the sampling program, analog quantity acquisition and filtering, digital quantity acquisition, device hardware self-test, external abnormal condition checks, and start criterion calculations are performed. Depending on whether the start conditions are met, it enters the normal operation program or the fault calculation program. The normal operation program performs auxiliary functions such as status monitoring and data preprocessing under fault-free conditions, while the fault calculation program carries out various protection algorithm calculations and trip logic judgments. When a device hardware self-test error occurs, a device lockout signal is issued, and the device is locked out, with protection退出.