Microcomputer Protection Measurement And Control Device

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Microcomputer protection measurement and control device

The KSTC900W series protection and control devices comprise generator protection, main transformer protection, line protection, transformer protection, capacitor protection, motor protection, reactor protection, automatic transfer switch (ATS) protection, PT protection, and more. They are suitable for power grids at 110 kV and below, as well as for plant auxiliary power systems in power plants. By integrating protection, measurement, control, and communication functions into a single unit through the use of a high‑performance 32‑bit CPU, these devices are ideally suited for deployment with substation integrated automation systems or plant electrical automation systems. The units can be mounted on panel boards for centralized installation, or directly installed on switchgear for distributed control.

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Detailed introduction

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Product Overview

The KSTC900W series protection and measurement‑control devices comprise generator protection, main transformer protection, line protection, transformer protection, capacitor protection, motor protection, reactor protection, automatic transfer switch (ATS) protection, PT protection, and more. They are suitable for power grids at 110 kV and below, as well as for plant auxiliary power systems in power plants. By integrating protection, measurement‑control, and communication functions into a single unit through the use of a high‑performance 32‑bit CPU, these devices are ideally suited for deployment with substation integrated automation systems or plant electrical automation systems. The units can be mounted on panels for centralized installation, or directly installed on switchgear for distributed control.

Product Features

● The hardware architecture is modular, featuring a fully sealed aluminum alloy enclosure; all internal modules are electrically isolated from the metal housing, with strict separation of high- and low-voltage circuits. Comprehensive self‑diagnostic and redundancy measures ensure excellent electromagnetic interference immunity.
● The device supports both AC and DC power, with a wide-range AC/DC input of 88 V to 264 V, facilitating on-site commissioning and engineering applications.
● With robust hardware resources, the device offers a wealth of signal inputs and output contacts. It comes standard with 12 digital input channels and 8 relay output channels, supporting flexible output configuration to facilitate on-site applications and the implementation of interlocking logic.
● Robust communication network: The device is equipped as standard with one Ethernet interface and one RS485 port, supporting multiple communication media. It can communicate with the monitoring system via either a single‑network or dual‑network configuration, offering high communication speed and reliability. The communication protocols comply with IEC 60870‑6‑104 and Modbus standards.
● Comprehensive event reporting and handling capabilities, capable of storing the most recent 64 action reports, the most recent 256 SOE status change records, the most recent 128 device operation logs, and the most recent 32 operation records.
● The hard‑wired control pressure plates for various protection functions can be flexibly configured and mapped to remote signaling, while the soft pressure plates for protection can be remotely enabled or disabled, facilitating on‑site maintenance and operation.
● Fault Recording Function: It can record voltage and current waveforms for two cycles prior to protection operation and six cycles following operation. The device can cyclically store waveform data for seven recording sets.
● Protection setting values are stored in multiple, relatively independent E2PROM/DSRAM areas, with automatic mutual verification and self‑repair capabilities, completely preventing the loss or corruption of settings during operation.
● Control circuit: anti‑bounce and trip‑close protection; circuit breaker position monitoring and control circuit open‑circuit detection.

Main Technical Parameters

Rated voltage	110V, 220V AC/DC
Rated frequency	50Hz
Scale error	≤±1%
Ambient temperature	-30℃~+70℃
Relative humidity	≤95% non-condensing
Measurement accuracy	Class 0.5
Protection level	IP32
Communication resolution	≤±1ms
Altitude	Below 4,000 meters
Service life	More than 20 years

Anti-interference and Mechanical Properties

● Resistance to high-frequency magnetic field interference: The device complies with the national standard GB 2887‑082, “Technical Requirements for Computer Room Environments,” and can operate normally under a magnetic field strength of 800 A/m.
● High-frequency electrical interference: The device can withstand the interference tests specified in GB 6162, with test power supply frequencies of 100 kHz and 1 MHz. The test voltages consist of a common-mode damped oscillatory wave of 28,000 V and a differential-mode damped oscillatory wave of 1,000 V. During testing, a DC voltage is applied to the relay under test, and the interference is superimposed under the critical conditions listed in Table 3 of Clause 3.3 of GB 6162. No false operations or failures to operate were observed.
● Pulse interference: Complies with IEC 255-22-5 and GB/T 15145-94.
● Fast transient disturbances: The device can withstand the Level III (3 kV) fast transient disturbance test as specified in IEC 61000-2-4.
● Electrostatic Discharge: The device shall withstand the IEC 61000-4-2 Level IV electrostatic discharge test as specified in the standard.
● Impulse Voltage: Each input and output terminal, with respect to ground; between the AC circuit and the DC circuit; and between the AC current circuit and the AC voltage circuit, can withstand a standard lightning impulse test of 5 kV (peak) without any insulation damage.
● Mechanical Performance: Under normal conditions, it has passed the Level II vibration and shock response tests.
● Transportation requirements: Passes Grade II vibration durability, impact durability, and collision tests.
● Impact Performance: The device shall withstand the vibration endurance test specified in GB 7261, Clause 17.5, at severity level 1. Following the test, no fasteners shall be loose or detached, and no structural components shall be damaged.
● Vibration Performance: The device shall withstand the vibration endurance test specified in Clause 16.3 of GB 7261, with a severity level of Grade 1. Following the test, no fasteners shall be loose or detached, and no structural components shall be damaged.
● Impact Performance: The device shall withstand the impact test specified in Chapter 18 of GB 7261, with a severity level of Grade 1. Following the test, no fasteners shall be loose or detached, and no components shall be damaged.

Selection Comparison Table

Serial number	Device Name	Product model	Scope of Application
1	Line Protection and Control Device	KSTC900W-311F	Protection and measurement & control for incoming (feeder) lines at 10 kV and below voltage levels.
1	Bus-tie protection and control device	KSTC900W-312F	Protection and measurement & control for bus-tie circuits at 10 kV and below.
2	Capacitor Protection and Monitoring Device	KSTC900W-321F	Capacitor protection and measurement & control for voltage levels of 10 kV and below
3	Transformer Protection and Monitoring Device	KSTC900W-331F	Protection and measurement & control for plant-use transformers at voltage levels of 10 kV and below
3	Anti-Islanding Protection and Monitoring Control Device	KSTC900W-335F	Protection for Grid-Connection Cabinets of Distributed Photovoltaic Power Plants at 10 kV and Below
4	Bus-tie automatic transfer protection and control device	KSTC900W-341F	The automatic transfer switch device for voltages of 10 kV and below also serves as bus-tie protection.
4	Infeed Automatic Transfer Protection and Monitoring Device	KSTC900W-342F	Automatic transfer devices for 10 kV and lower voltage levels also serve as line protection.
5	Busbar PT Protection and Monitoring Device	KSTC900W-351F	Protection and measurement & control for single-bus PTs at voltage levels of 10 kV and below.
5	Busbar PT Parallel Protection and Monitoring Device	KSTC900W-352F	Voltage switching between double busbars at the same voltage level of 10 kV and below
6	Motor Protection and Control Device	KSTC900W-361F	Protection and measurement & control for high-voltage motors at voltage levels of 10 kV and below.
	Integrated Protection and Control Device for Electric Motors	KSTC900W-362F	High-voltage motor protection and measurement & control for voltage levels of 10 kV and below, with differential protection.
	Reactor Protection and Monitoring Device	KSTC900W-363F	With longitudinal differential protection, it is suitable for reactor-specific protection.
7	Generator-transformer unit differential protection and monitoring device	KSTC900W-371F	Yd11 connection, applicable to longitudinal differential protection and non-electrical quantities.
	Generator Backup Protection and Monitoring Device	KSTC900W-372F	Thermal power plants below 100 MW, hydropower units below 10 MW.
	Generator Integrated Protection and Control Device	KSTC900W-373F	Backup plus differential, suitable for small-capacity generators.
	Fault-induced disconnection protection device	KSTC900W-374F	Fault‑clearing device on the load side or the small‑source side for voltage levels of 110 kV and below.
8	Main Transformer Differential Protection and Monitoring Device	KSTC900W-391F	Longitudinal differential protection plus non-electrical quantities, applicable to multiple wiring configurations.
	Main Transformer Backup Protection and Monitoring Device	KSTC900W-392F	Optional configuration for the high-voltage side, medium-voltage side, and low-voltage side.
	Main Transformer Integrated Protection and Control Device	KSTC900W-393F	Longitudinal differential protection + high/low backup + non-electrical quantities, applicable to multiple wiring configurations.

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