| 51 | definite-time overcurrent against external faults |
| 51 | overcurrent against overloads |
| 51 | inverse-time overcurrent against overloads and faults |
| 50 | overcurrent against internal faults |
| 51N | ground overcurrent |
| · | arc flash detector (optionally) |
Additional functions:
– cooperation with UFLS and auto reclose after UFLS automation
– cooperation with busbar protection systems
– cooperation with CB failure protection
Cooperation with breakers function ensures:
– supervising of CB postition
– SF6 gas pressure supervising (only CZAZ-TH v.3)
– supervising of control switch (local – out-of-service – remote) (only CZAZ-TH3 v.3)
– Trip Circuits Supervising functions and auxilliary voltage supervision
– Open command and Close command
– Disconnector and Earthing switch postion supervising
– 8 programmable relay outputs
– 6 binary inputs for cooperation with external protections, incl. 2 for cooperation with Bucholtz protection of transformer and transformer tap changer
– 2 TRIP purposes relay outputs allowing to direct connection with CB coils and with Trip Circuit Supervision function
– 7 measuring inputs (phase currents, phase-to-phase voltages, residual current/voltage)
– Measuring of current electrical vaules (phase currents, zero-sequence current, phase-to-phase voltages, active power, reactive power, active energy counter, power factor)
– Event and disturbances recorders
– ab. 70 unique events register with capacity to memorise up to 500 events
– disturbance recorder of sampling frequency 1000 Hz (7 analog signals and 16 binary signals)
– parameters of last disturbance recorder: maximum current during disturbance and duration of disturbance
– number of protection operations counter and sum of tripped current counter
– optical visualisation of most important states of protected object (8 LED diodes)
– autotest and autocontrol system
– screw terminals for current inputs and pluggable screwless terminals for other circuits
– autonomic communication by local Human Machine Interface
– remote communication with PC computer or supervising system
| Rated current In | 1A or 5A |
| Rated voltage Un | 100V |
| Rated frequency fn | 50Hz |
| Auxilliary voltage Up | 110V, 220V DC |
| Burden in analog inputs | ≤0,5VA/input |
| Burden in auxilliary voltage supply | ≤20W |
| Operating time | ≤40ms |
| Continuously thermal withstand of current inputs | 2,2In |
| 1 sec thermal withstand of current inputs | 80In |
| Dynamic withstand of current inputs | 200In |
| Continuously voltage withstand of voltage inputs | 1,2Un |
| 10 sec voltage withstand of voltage inputs | 1,5Un |
| Relay outputs data | |
| Max. breaking capacity by 250V DC | |
| – resistive load | 0,3A |
| – inductive load of L/R ≤40ms | 0,12A |
| Max. breaking capacity by 250V, 50Hz | |
| – inductive load, cosϕ=0,4 | 3A |
| Continuous contact carry | 5A |
| Ambient temperature | (268÷313)K/(-5÷40)°C |
| Relative humidity | ≤ 80% |
| Ingress Protectrion degree | IP40 |
| Dimensions (height x width x depth) | |
| – surface mounting | 223 x 337 x 260 mm |
| – flush mounting | 288 x 145 x 305 mm |
| Electromagnetic compatibility according to | EN 60255-26 |
| Insulation according to | EN-60255-5 |
Available versions of CZAZ-TH – depends on bay configuration:
CZAZ-TH, CZAZ-TH v.3
Details – see product datasheet
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