SPRECON ® -E-P DSZ4
16Pages

OVERCURRENT TlME PROTECTION TECHNICAL BROCHURE

Application This multifunction protection device is mainly used as overcurrent-time protection. It can be applied in every system type as line protection and, together with other protection devices, also as equipment protection (for example transformer, motor, generator). An up to three-sectional characteristic, consists of an overload range and two definite-time overcurrent stages. This corresponds to the most common needs. In addition, inrush effects are mastered. The protection for the earthing resistor in short-duration earthed systems is possible because of 0.1 min steps in adjustments...

Protection functions Overcurrent-time protection The overcurrent-time protector may be adjusted separately for the overcurrent (IL>) and high-current (IL>>) definite time stages. Current measurement is phase-selective in each phase. Additionally, the SPRECON-E-P DSZ4 offers an inverse-time overcurrent stage ILp (IDMT). Its tripping time is determined using the formulas indicated below (IEC 60255151). long time inverse 1. long time inverse: Characteristics for „long time inverse“ normally inverse wherein are: ta: tamax: tILp: I : ILp>: tripping time maximum tripping time (setting value) time...

Treatment of single pole line to earth faults This protection function is used mainly in systems having insulated or compensated star points. It serves the treatment of double earth-faults. In this case often the strategy of switching off only one earth-fault root. The rest of the system can have an earth-fault for a longer time. To switch off one root a preferential phase treatment is integrated. very inverse This protection function allows suppressing inrush effects – also such types which cannot be detected by harmonics calculation – besides the quick tripping with the switch-on to a...

Thermal overload protection Circuit-breaker failure protection (CBF) The integrated overload protection works with a thermal model based on r.m.s. current values. The calculated thermal level will be compared with the set tripping value (when tripping is selected) respectively warning level value. If occasion arises, a response or an alarm is issued. The influence of the previous load will be regarded. The characteristic meets IEC 60255-8. The function shall recognize the failure of the own, assigned circuit breaker. A time stage is started together with the trip command, and during its...

External TRIP - command An external trip-command can be connected, executed and recorded in the event memory. Input signal processing yellow yellow Device ready Alarm + Malfunction TRIP The input signals are freely programmable; several inputs for one function may be used. Processing the optocoupler input signals, the logic functions negation (NOT), AND, OR are available. As a result, there are logical input signals for internal processing in the protector. LED assignment on delivery for SPRECON-E-P DSZ4 u: updating l: latching Additional functions After a „TRIP“ command or an alarm the LCD...

Measured-value checking Measured current values arriving through current transformers are monitored for symmetry. Time synchronisation Different possibilities of timesynchronization are available. Included is the use of the SPRECON-E-P DSZ4 as a “mother clock”. Self-test Comprehensive monitoring routines of the hardware and for the software are provided to detect and signal malfunctions of the protector. There are cyclic tests and tests during start-up. Depending on the detected abnormal condition, the protector is taken out of operation or an alarm is issued. Using the green LED to...

Serial interfaces For preparing and performing the setting and readout of the digital protection relay series from D…2 on at the engineer‘s work place a PC operator program COMM-3 exists. Archiving of settings measurands and events is easy to do, also comparing of settings. For bigger utilities the creation of a partially access to settings for other users may be interesting. A skilled protection-engineer can plan the basic settings that can be blocked after it to others. COMM-3 consists of a management program and several device programs characterised by the “structure” number. COMM-3 is...

Specifications (1 of 2) The protection relay satisfies the requirements of the product standards IEC 60255-6; VDE 0435-303; IEC 60255-27. Mechanical construction Sheet-steel housing for Dimensions Weight Degree of protection: (EN 60529) Terminals panel surface mounting or panel flush mounting see dimensioned drawings < 3 kg Housing / Terminals solid wire stranded wire solid wire stranded wire Permissible ambient conditions Operating temperature Storage temperature Transport temperature Relative humidity (IEC 60068-2-3) 93% at <40 °C (moisture condensation not permitted) Mechanical strength...

Specifications (2 of 2) Characteristic values (selection) Tripping time (I=0→I=2 x IN) Resetting time Accuracy current measurement Routine testing Dielectric test RS485 Each protection relay will be subjected to a 72-hour alternate temperature test while in function. Type testing Impulse voltage test EMC noise immunity Discharge of static electricity (ESD) Electromagnetic RF field Fast transients Surge Conducted disturbance induced by RF fields Power frequency magnetic field EMC emitted interference Auxiliary power supply Auxiliary power UH Operating range Power consumption Stored energy...

Order data SPRECON-E-P DSZ4 (1 of 2) PI.-No.: 1 801 Panel surface mounted, IP50 Flush panel mounted, IP50 Current transformer: 6th digit Output relays: 7th digit Type of housing: 5th digit Inputs: 8th digit Serial interface: 9th digit Auxiliary voltage: 10th digit Standardliefervarianten Flush mounted IP50, 3x1 A, 4 M-relays, RS232+RS485, 2 OC

Order data SPRECON-E-P DSZ4 (2 of 2) Management program (CD) On delivery CDROM the user manual is included as a PDF-file. all devices [structure versions] License for device programs Type of device: 8th and 9th current structure version license old or single structure version When reordering a device program the structure version number of the device is necessary additionally (see label on device). The current structure version indicated in a square bracket applies to the issue date of the leaflet. Example for SPRECON-E-P DSZ2, old structure version 3001: Pl.-No. 1744 991 301- 3001