(1) Application
DEP-800 series are used for 6 ~ 110KV power systems with insulated, resistance earthed or impedance earthed neutral. Optional to be installed standalone or on switchgear cubicles.

(2) Product Features
Integrated with protections, monitoring and control functions in one assembly, instead of being separated. Reduced wiring brings stronger anti-interference capability.
All the assemblies are connected via LonWork field network.
The single-wire diagram and digital states can be displayed on the liquid crystal screen in the assembly.
Adaptive to 0.5 ~ 5A tripping and closing current eliminates the requirement for the user to provide breaker parameters.
Distributed power supply reduces the consumption of energy to 8 W or less.
Wider range of working ambient temperature reinforces reliability. The built-in RTDs can provide over-temperature or under-temperature alarming if necessary.
Fault recording function extends its capability.

(3) Main Monitoring and Control Functions
I,V,P,Q,COSΦ,f,KWH can be calculated from analog inputs by 3-phase PT/CTs.
8 digital inputs from external physical contacts, 8 digital indications from internal logical protection states.
2 pulse inputs can be accumulated.
1 digital output works as control command.
Event recording and SOE.
To communicate with local systems via LonWorks field bus.

(4) Main Protection Functions
Microprocessor Based Feeder Protective Relay with Monitoring and Control Function (DEP-821)
*3-stage definite-time low-voltage-blocked overcurrent protection
*Inverse-time overcurrent protection ( IEC/ANSI 3 characteristics optional )
*Pre-acceleration, post-acceleration, and manual switch-on acceleration
*3-pole 3-shot non-check auto reclosure
*Distributed low-frequency load shedding
*Zero-sequence overcurrent protection and earthed-phase selection
*Overload protection
*Fault recording and data logger

Microprocessor Based Line Protective Relay with Monitoring and Control Function (DEP-822)
*3-stage complex-voltage blocked directional overcurrent protection
*Inverse-time overcurrent protection ( IEC/ANSI 3 characteristics optional )
*Pre-acceleration, post-acceleration, and manual switch-on acceleration
*3-pole 3-shot auto reclosure ( non-check, synchronization check, non-voltage check optional)
*Distributed low-frequency load shedding
*Zero-sequence overcurrent protection and earthed-phase selection
*Overload protection
*Fault recording and data logger
Microprocessor Based Capacitor Bank Protective Relay with Monitoring and Control Function (DEP-825)
*3-stage overcurrent protection
*Inverse-time overcurrent protection ( IEC/ANSI 3 characteristics optional )
*Over-voltage protection
*Low-voltage protection
*Zero-sequence overcurrent protection and earthed-phase selection
*Differential currents and differential voltages protection
*Fault recording and data logger

Microprocessor Based Auto Backup Switch-on and Sectionalizer Protective Relay with Monitoring and Control Function (DEP-827)
* Back-up incoming line auto switch-on
*Back-up segregator auto switch-on
*Short-time open overload co-shedding
*Segregator protection: energizing protection, complex-voltage blocked overcurrent protection, inverse-time overcurrent protection, post-acceleration, zero-sequence overcurrent protection
*Fault recording and data logger

Microprocessor Based Motor Protective Relay with Monitoring and Control Function (DEP-829)
*Overcurrent protection and locked/stalled rotor protection
*Inverse-time overcurrent protection ( IEC/ANSI 3 characteristics optional )
*Negative sequence overcurrent protection
*Pilot-wire differential protection
*Zero-sequence overcurrent protection and earthed-phase selection
*Low-voltage protection
*Over load alarming
*Fault recording and data logger

(5) Specification
(a) Current/voltage Setting error : <2%
Frequency setting error : <0.01HZ
Time setting error for definite time: <50ms
Time setting error for inverse time: <2 s
(b) Measurement accuracy and resolution
Current/voltage: 0.2%
Active power/reactive power: 0.5%
Power factor: 0.5%
SOE resolution: ≤2ms
Pulse input resolution: ≤2ms
Analog input refresh rate: <2s

(c) Working temperature: -25oC ~ +60oC
(d) Dielectric test voltage: 2 KV/AC, 1 min.
Surge test voltage: 5KV

(e) Mechanical stress tests, vibration, shock stress and seismic vibration
IEC60255-21-1, Class II
IEC60068-2-6

(f) EMC tests
IEC60255-22-1 HF Disturbance Test with Damped Oscillatory Wave, Class III (2.5KV c.m. 1KV d.m.)
IEC60255-22-2 Electrostatic Discharge Disturbance Tests, Level IV
IEC60255-22-3 Radiated Electromagnetic Field Disturbance Tests, Class III
IEC60255-22-4 Fast Transient Disturbance Tests, Class III