Capacitor Protection Relais - CPR04
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Introduction The Trench CPR 04 is a comprehensive, numeric protection relay, featuring: • Operating mode software selectable (NORMAL / H-BRIDGE) • RS232 serial data port at the front • Compact draw-out design • Panel or 19 inch rack mounting • Four software configurable measuring elements • Five configurable output relays • Software selectable RS232 or RS485 serial data port at the rear • Time stamping function for trip history and setting menu Application The CPR 04 provides comprehensive protection for the capacitive, inductive and resistive elements of three phase medium and high voltage...

NORMAL MODE - Protective functions Peak repetitive overvoltage protection For each phase, CPR 04 determines the peak repetitive capacitor voltage using advanced Digital Signal Processor (DSP) techniques, by integrating the measured line current waveform, to give a signal representing the voltage waveform applied to the capacitor bank. The peak repetitive voltage of this signal is then extracted, and compared to adjustable thresholds. For calculated peak repetitive voltages above the thresholds, a starter signal is output, and the inverse time ANSI capacitor temporary overvoltage withstand...

NORMAL MODE - Protective functions Earth fault protection Undercurrent protection CPR 04 calculates the fundamental frequency earth fault current, Io , as the magnitude of the vector sum of the three phase line currents. Io is compared with adjustable thresholds each with an adjustable definite timer. Trip signals are output, if the associated thresholds are exceeded for the definite times set. For each phase, CPR 04 calculates I1 , the fundamental frequency component of the line current. I1 is continuously compared with an adjustable undercurrent threshold, I1<, with an associated...

H-BRIDGE MODE - Protective function „H“ configuration capacitor bank unbalance protection In an alternative user-configurable operating mode, CPR 04 provides fundamental frequency „H“ configuration capacitor bank unbalance protection only. This provides sensitive unbalance protection independently for each phase of a capacitor bank. For each phase the CPR04 calculates the fundamental component of the measured unbalance current. The natural unbalance of each phase can then be compensated in amplitude and phase angle, to detect subsequent changes. (∅a/b/c lub) The unbalance current (∅ )a/b/c...

Relay design Measuring elements Four current measuring elements are provided within CPR 04. The nominal current (1A/5A) can be set in the menu. Relay outputs CPR 04 has six output relays. The functionality of output relays 1 to 5 is user configurable. The user may program the relays to be manual or selfresetting, and to be normally energized or de-energized during the power-up healthy condition. In addition, the user may direct any of the binary output signals of the protective functions to output relays 1 to 5. block. However, the user can easily change the contacts of the output relays to...

Relay design Interactive configuration of the protection relay Three LED indicators are provided on the front panel of CPR 04, as follows: • During testing: Interactive self testing of the protection relay • Green LED: This indicates that the auxiliary power supply is on, and the self-supervision output relay is energized, indicating that the protection relay is healthy. • Yellow LED: This indicates that one (or more) of the „starter“ binary outputs signals of a protection function is (are) at logic 1 (high), and that the protection relay may trip if the condition persists. • Red LED: This...

Relay design Housing and terminals CPR 04 is housed in a draw-out chassis within a fixed case. This housing is particularly suitable for both flush mounting and 19 inch rack mounting. The case is designed for indoor use in tropical climate and is designed to withstand shock, vibration and the ingress of dust and moisture. A terminal block, with 28 recessed terminals, is provided on the fixed case. Standard screw terminals, or fast-on connectors, can be used on the terminal block, for the external connections to the protection relay. Withdrawing the protection relay module automatically...

General characteristics

Technical specifications Auxiliary power supply Output relays Quantity Nominal rated current, In Continuous current Short time current Burden Accuracy of measurement Nominal rated voltage, Vx Operative range AC / DC Burden with DC supply Burden with AC supply Quantity Contact form (per relay) Load Rated load Max. operating voltage Rated load Digital input channel Pushbuttons Display Serial data port Real Time Clock Rated carry current Max. operating voltage Min. permissible load Quantity Function Isolation Type Function Type Type Screen Size Character height Type Function Quantity Isolation...

Block diagram ANTI ALIASING OPTICAL ISOLATION OPTICAL ISOLATION POWER SUPPLY

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