WDH-823_Xuji Microcomputer Motor Protection Device

NegotiableUpdate on 03/29

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Nature of the Manufacturer: Producers

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Overview

WDH-823_Xuji Microcomputer Motor Protection Device

Product Details

1. Introduction to the device

The WDH-820 series microcomputer motor protection device is suitable for the protection and measurement of medium and high voltage asynchronous motors with voltage levels of 3kV to 10kV. It can be directly installed on the switchgear or installed in a group screen. The WDH-821 microcomputer motor protection is used for the protection of small and medium-sized asynchronous motors below 2000 kW; WDH-822 and WDH-823 microcomputer motor protection are used for the protection of large asynchronous motors of 2000kW and above.

1.1. Function configuration: Please refer to Table 1-1

Table 1-1: Functional Configuration

	Function Name	WDH-821	WDH-822	WDH-823
protection function	Motor start-up timeout protection	√	√	√
	Two stage current protection	√	√	√
	Inverse time current protection	√	√	√
	Two stage negative sequence current protection	√	√	√
	low voltage protection	√	√	√
	overvoltage protection	√	√	√
	Overload protection	√	√	√
	Zero sequence current protection	√	√	√
	overheat protection	√	√	√
	Magnetic balance differential protection		√
	Differential quick break protection			√
	Ratio differential protection			√
	Differential current over limit alarm			√
	TA wire breakage detection			√
	Non electric quantity I protection	√	√	√
	Non electric quantity II protection	√	√	√
	Control circuit abnormal alarm	√	√	√
	TV disconnection detection	√	√	√
Measurement and control function	8-channel remote signal input acquisition, device remote signal displacement, accident remote signal	√	√	√
	Normal circuit breaker remote control opening and closing, low current grounding detection remote control opening and closing	√	√	√
	P. Telemetry of analog quantities such as Q, IA, IC, Uab, Ubc, Uca, f, etc	√	√	√
	Statistics of switch accident opening and closing times and event SOE, etc	√	√	√
	fault recording	√	√	√
	4-channel pulse input	√	√	√

1.2. Main Features

1. The reinforced unit chassis is designed to resist strong vibration and interference, and is particularly suitable for harsh environments. It can be installed separately on the switchgear for operation.

2. All integrated circuits are made of industrial products, ensuring high stability and reliability of the device.

3. Using 32-bit DSP as the protection CPU, configured with large capacity RAM and Flash Memory; Strong data operation, logical processing, and information storage capabilities, high reliability, and fast running speed.

4. Using 16 bit A/D as data acquisition, data collection is conducted 24 hours a week to ensure high measurement accuracy.

5. Adopting graphical LCD display and fully Chinese menu style human-computer interaction; It can display various operating statuses and data in real time, with detailed and intuitive information, and easy operation and debugging.

6. It can independently set 8 sets of protection settings, and the switching of the setting area is safe and convenient.

7. Large capacity information recording: capable of storing no less than 100 recent historical reports, with action parameters, power failure maintenance, and easy accident analysis.

Adopting DL/T667-1999 protocol and equipped with RS-485 communication interface; Networking is economical and convenient, and can directly communicate with microcomputer monitoring or protection management machines.