KR-3000AIntroduction to Series High Voltage Line Protection and Measurement Devices

The KR-3000A series high-voltage line protection and measurement device is suitable for the protection and measurement of various types of high-voltage lines up to 110KV. The integrated automation system is a layered and distributed system, designed and configured according to the principle of one component (one interval) per device distribution. It can be directly installed on the high-voltage switchgear in a decentralized manner, with independent functions for each interval. The devices are only connected through the network for information sharing. This series of devices has complete self checking and self verification functions, and basically achieves calibration free operation.

For the convenience of design and selection, this series includes KR-3210A high-voltage line protection and measurement device, KR-3220 high-voltage line differential protection device, and KR-3230A high-voltage bus tie protection and measurement device.

Main functions

●Three stage directional overcurrent protection with low voltage lock-in time limit

●Three phase primary reclosing

●A closing acceleration protection with a fixed value that can be independently set (optional front acceleration)

●Low cycle load reduction protection

●Zero sequence overcurrent protection/small current grounding line selection

●9-channel remote signal input acquisition, remote signal displacement, and accident remote signal

●5-channel analog telemetry

●2-channel pulse input

●Statistics of accident tripping frequency and accident SOE, etc

KR-3230AWiring schematic diagram of high-voltage bus tie protection measurement and control device

Note:

1. This diagram uses the device's built-in anti bounce circuit, which is suitable for voltage divider coil type operating mechanisms

2. For circuit breakers operated by permanent magnet triggering, refer to the operating circuit diagram for selection, or lead the spare passive tripping and closing contact to the permanent magnet operating port circuit

3. The secondary grounding point of current and voltage is not marked