Line Protection Relay

We are offering line protection relay of switchgear is a new solutions integrating switchgear measurement, display, protection and control.
line protection relays of medium voltage switchgear
dm-100 series of switchgear intelligent protection, measurement, display and control device is the product developed by zhuhai wanlida electric co., ltd, combining with many years of operational experiences in power industry and by the effective integration of switchgear measurement, display function and miccroprocessor-based relay protection and control functions.
firstly create segregated installation mode
dm-100 switchgear intelligent protection, measurement, display and control device is designed by the main body of device and human-computer interface segregation. The main body of the device can be independently installed in the instrument room of switchgear, and the large number of wiring connected with control cable and analog signal acquisition cable can be directly connected with terminal strip within the instrument room, the man-machine interface of the device can be installed on panel of instrument room so as to focus on various human-computer interaction function and communicate by ethernet with protective main body. It not only reduces the pressure of protective device on the panel, but also greatly reduces the setting of over-door cable.
device features:
originally created "protection", "measurement and display" integrated products. With sophisticated switchgear intelligent collection and control function.
it uses real-time multi-task operating system and c++ programming techniques and can carry out on-line programming and simulation.
it uses large-screen color lcd with beautiful display, and is easy to be operated. The user-defined buttons below the screen define different functions combining with different menus, which is easy to be operated. Meanwhile, each menu offers help function to prompt the operation method of the menu.
the communication uses dual-rs485 interfaces and dual ethernet interfaces. It supports power industry standard code iec-60870-5-103 and iec-60870-5-104 communication protocol. It can easily achieve redundant communication by providing more communication interfaces.
it has harmonic analysis function of two-way selectable channels.
device functions
1. Intelligent measurement and display functions:
dynamic simulation screen
temperature and humidity control
live display and lock
voice misoperation protection and dynamic display
body inductive probe
lighting within the switchgear
2. Measurement and control functions:
14-way telesignalisation open collection and record
ia, ib, ic, uab, ubc, uca, p, q, cosî¦, u0, i0, f remote measurements uploading.
it has two-way 1~11 times, i.e. A total of 22-way to upload harmonic waves so as to meet the monitoring requirements of power quality.
2-way bidirectional-integral electrical energy (active power and reactive power).
soe event records
one-way 4~20ma output
3. Other features
the independent operation circuit with electrical trip protection
faults recorder
small current circuit selection function
10 times trip records and 40 times event records
many sets of constant value zones
protective function
dm-100l(line)
current protection in three-section voltage lockout direction
quick-break protection
inverse-time overcurrent protection
overcurrent protection
overload protection
current protection in direction of zero sequence voltage lockout
zero sequence current protection
zero sequence overvoltage alarm
zero sequence voltage lockout zero sequence current protection at high-voltage side
zero sequence constant time lag (inverse time lag) current protection at low-voltage side
locked protection
overheat protection
negative-sequence constant time lag (inverse time lag) overcurrent protection
low voltage protection
over-voltage protection
unbalanced current (voltage) protection
under-voltage protection
body protection
low-cycle load shedding
three-phase one-time reclosing
post-acceleration
bus bar charging protection
technology shunt tripping (four-way)
pt broken line monitoring
pt switch in parallel