Protection and control Sepam range Sepam 0 LA Self-powering protection Merlin Gerin Square D Telemecanique
presentation contents page presentation protection functional and connection schemes other connection schemes connection characteristics 9 installation commissioning ordering information Sepam 0 is a group of modules that may be used: individually to perform a function, in combination with Sepam 00 or Sepam 000. Each module has been designed to perform a complete function. It includes all the elements required, such as: sensor interface, tripping output relays, annunciation, settings, connections. application Sepam 0 LA is used as the main protection system in substations which do not have an auxiliary power supply source. Combined with a Sepam 00 or Sepam 000, it provides back-up protection for the substation incomers. This protection goes into effect when the main protection chain fails due to: power supply fault, wiring fault, trip unit fault, shutdown of Sepam 00 or Sepam 000. Sepam 0 LA. advantages protection against low-value phase and earth faults, self-powering: Sepam 0 LA is powered by the current sensors, may be put in disabled status (inactive output) via an external inhibition contact, tripping by a low power-consuming «MITOP» trip unit (). high level of immunity to electromagnetic disturbances. () MITOP: Merlin Gerin circuit breakers may be equipped with this type of trip unit upon request.
description The front face of Sepam 0 LA contains the instruments needed for the phase and earth protection settings. Each set of microswitches, marked K, K, K and K and associated potentiometer P, P, P, P should be positioned according to the desired setting. K CTA CTA, 9,,, 0 0 0 CT A CT A K 0 microswitch set to 0. K 0 microswitch set to. t - - 0, 0, 0, 0,0 t P K (ms) 0 0 0 00 0 0 P K CTA CTA - - 0, 0, 0, 0, 0 P x x Io> ) K (ms) 0 0 0 00 0 0 P x x, 0 +0 ms I> I> = In ) 0 +0 ms K x P N N Io> = K x P In Setting example: CT = 0/, K =, P =. and N =. using the formula: I> = x. In I> =., I> = 0A primary In The microswitch is fitted with a potentiometer that the user turns to adjust the setting. Potentiometer turned fully to left = minimum setting, to right = maximum setting. setting increases as potentiometer is turned to right sepam 0 S0 LA Front face displaying the setting instruments.
protection Sepam 0 LA provides sorts of protection: phase overcurrent (ANSI 0/): protection of equipment against phase-tophase faults (- or -phase), earth fault (ANSI 0N/N): protection of equipment against earth faults in directly earthed or impedance earthed networks. This sort of protection is appropriate for current transformers: A secondary (CT A), A secondary (CT A). phase protection setting range set point time delay. to In on A CT 0 to 0 ms 0. to In on A CT 0 to 0 ms accuracy ± % ± % Setting includes: making a number of turns around the interposing ring CT primary, positioning microswitches K (), fine tuning using the potentiometer: min to max. Phase current setting (multiple of In) TC A position of K in front face () Wiring of turns on the interposing ring CT (e.g. turns). number position of P potentiometer of turns min max min max min max min max min max min max 0 9... 0. 0 9..... 0 9.. 0.. 0.. 9.. 9........... 9..9........0....9...... CT A position of K in front face () number position of P potentiometer of turns min max min max min max min max min max min max.. 9...9 9....0..9........0..................0... 0. 0.9 0.9..0.......9 0. 0. 0. 0.9 0..09 0.9..0.0.. 0. 0. 0. 0. 0. 0.9 0..0 0.9.. earth protection setting range set point time delay 0. to. In on A CT 0 to 0 ms 0.0 to 0. In on A CT 0 to 0 ms accuracy ± % ± % Setting includes: positioning microswitch K (), fine tuning using the potentiometer: min to max. Earth fault current settings (multiple of In) () If all the microswitches are set to 0, the protection will be inhibited. Only one microswitch in the group should be set to. The potentiometer associated to the microswitch allows a tunning of the setting value: minimum setting (x): turned fully to left, maximum setting (x.): turned fully to right. position of K on front face () position of P potentiometer min max min max min max min max CT A 0. 0. 0. 0. 0. 0. 0.. CT A 0.0 0. 0. 0. 0. 0. 0. 0.
time delays 0 to 0 ms with definite time. Setting includes: positioning microswitch K (phase protection), K (earth protection) (), fine tuning using the potentiometer: 0 to + 0 ms. Time delay setting (ms) position of K or K () position of P or P potentiometer min max min max min max min max min max min max 0 0 0 00 00 0 0 0 0 0 The duration of the time delay includes MITOP trip unit tripping time. current sensors The current transformers should be sized so as not to saturate at the setting, taking into consideration Sepam 0 LA's input impedances: phase input: 0.0 Ω, earth input: 0.0 Ω, (i.e. 0. Ω for phase + earth protection). In practice, a. VA, P, A secondary type transformer is appropriate. The current transformer windings should be coiled round a separate magnetic coil and must not supply power to any circuits other than the Sepam 0 LA's circuit. interposing ring CT choice protection CT A CT A phase ACE 9 ACE 9 phase + earth ACE 9 ACE 9 () If all the microswitches are set to 0, the protection will be inhibited. Only one microswitch in the group should be set to. The potentiometer associated to the microswitch allows a tunning of the setting value: minimum setting (+0ms): turned fully to left, maximum setting (+0ms): turned fully to right.
functional and connection scheme phase and earth protection L L L ACE 9 P P S S 0 A ECM 0 0N N 9 A DPC 0 A A circuit breaker () MITOP trip unit blue (-) red (+) Sepam 00 or Sepam 000 watchdog contact Arrangement with phase CTs. It is mandatory to use the ACE 9 interposing ring CT. () the linking between Sepam 0 LA and the MITOP mustn t be bigger than Ω.
other connection schemes phase protection The following arrangement is used for phase protection: or phase CTs, ACE 9 interposing ring CT for A or A CT. P P S S ACE 9 0 A ECM phase CT arrangement. A DPC 0 A A phase and earth protection The following arrangement can be used for earth protection: or phase CTs, a current transformer on the earthing connection. For A CTs: ACE 9 inteposing ring CT. For A CTs: ACE 9 interposing ring CT. P P S S ACE 9 or ACE 9 0 A ECM 9 A DPC 0 A A P P S S phase CT arrangement, and residual current on ground connection.
connection Sepam 0 LA A A -pin CCA connector, screw terminal cabling with cables 0. to. mm max., each terminal capable of receiving two. mm cables. A 0 9 A 0 9 phase current phase current phase current residual current 9 MITOP 9 inhibition earthing terminal on right side face. Rear view. Terminal identification Each terminal is identified by characters. board slot number connector identification letter connector terminal number ( to ) A interposing ring CT phase current () phase current () phase current () () the connection is made directly without any intermediary terminal block on the interposing ring CT. Make the required number of turns. 9 input residual current phase phase phase output residual current N.B. The ACE 9 interposing ring CT does not have a residual current circuit. ACE 9/ACE 9 interposing ring CT connection scheme.
characteristics environmental characteristics climatic operation IEC - - C to C storage IEC - - C to 0 C damp heat IEC - 9% to 0 C mechanical degree of protection IEC 9 IP front face vibrations IEC -- class I shocks IEC -- class I fire NFC 0 glow wire electromagnetic radiation IEC -- class x 0 V/m electrostatic discharge IEC -- class III electrical./0 µs impulse wave withstand IEC - () kv damped MHz wave IEC -- class III ns fast transients IEC -- class IV energetic transients IEC 0- () () printed in 9 and amended in 99. () pending. marking on our product guarantees their conformity to European directives. 9
installation dimensions and weights Sepam 0 mounting latch Cut-out 0 0 max. 0 max. e = mm max weight:. kg. mounting details Interposing ring CTs phases ACE 9 (A or A CT). phases and earth ACE 9 (A CT), ACE 9 (A CT). 0 0 DIN rail mounting weight Kg 0 0 weight. Kg Connection By. mm clip, max. wire cross-section. mm.
commissioning CT A CT A I> = In K x P N N Example of identification. phase protection make the required number of turns on the ACE 9/9/9 interposing ring CT, as indicated in the chart (page ) (the number of possible turns may be limited by the cross section of the wire: max.. mm for turns). Make a note of the following on the front face: v type of current sensor, or A (e.g. CT A) v number of turns made (e.g. ). set microswitch K on the front face to the desired set point (fine tuning potentiometer P turned fully to the minimum setting on the left). Only microswitch among the available should be set to (for miminum time delay setting, microswitch K should be set to and the corresponding potentiometer P turned fully to the left). inject the set point current and turn the potentiometer until the MITOP trips, after having shorted the earth matching transformer for the duration of testing. Set the time delay to the desired value using microswitch K and the related potentiometer P. earth protection set microswitch K on front face (fine tuning potentiometer P turned fully to the minimum setting on the left). Only microswitch among the available should be set to (for miminum time delay setting, microswitch K should be set to and the corresponding potentiometer P turned fully to the left). inject the set point current and turn the potentiometer until the MITOP trips set the time delay to the desired value using microswitch K and the related potentiometer P.
Ordering information Sepam 0 LA () quantity Phase interposing ring CT ACE 9 ()... Phase + earth interposing CT ACE 9 () (A secondary)... ACE 9 () (A secondary)... () Sepam 0 LA does not include supply of the MITOP trip unit which should be provided with the circuit breaker. () With Sepam 0 LA, it is mandatory to choose the type of protection and the type of current transformer secondary. Schneider Electric SA postal address F - 00 Grenoble cedex 9 tel : 0 0 telex : merge 0 F As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication. This document has been printed on ecological paper. Publishing: Schneider Electric SA Design, production: Idra Printing: AC099/E ART. / 99