Eaton MET Operating Instructions Manual

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Eaton MET Operating Instructions Manual Manual pdf 9 page image

5 OPERATING INSTRUCTIONS MN280067EN July 2017Type MET electronic recloser control tester operating instructions(2) Energize the operator cabinet of the recloserwith 230-Vac power and turn Test SelectorSwitch S6 to CHARGE—(40 mA). The metershould read approximately 15 mA minus thedischarge rate measured in Step 3.5. Disconnect the test cable and reconnect the jumperlink between the ⇐|⇒ terminals on the control panel.Control testsThe right side of the tester panel contains theinstrumentation and associated test switches for checkingthe operation of the Type ME electronic control. The testcurrent generated by the tester simulates the output of therecloser’s current-sensing bushing transformers.Minimum trip resistors, used in Form 2, Form 3 and Form3A controls, with a yellow label are used with reclosershaving 1000:1 bushing-current transformers. Thus, thetest current in milliamps will be equivalent to the reclosercurrent in amps in a direct 1:1 ratio. To simulate a 200-ampfault current, the tester output is adjusted to 200 mA.Minimum trip resistors with blue labels are used in Form2, Form 3 and Form 3A controls that are connected toreclosers having 2000:1 bushing-current transformers (TypesME, MLE, and MVE reclosers). In these cases the testcurrent in amps will be equivalent to the recloser current ina 1:2 ratio. To simulate a 200-amp fault current, the testeroutput is adjusted to 100 mA.Form 4A and Form 4B controls can be programmedto operate with 500:1, 1000:1 or 2000:1 ratio currenttransformers. Prior to testing Access Code 10 must beexamined to determine the programmed ratio. The testcurrent, in amps, is then equivalent to recloser current ineither a 1:0.5, 1:1 or 1:2 ratio, respectively. To simulate a200-amp fault current, at a 500:1 ratio, the tester output isadjusted to 400 mA. To simulate a 200-amp fault current, ata 1000:1 ratio, the tester output is adjusted to 200 mA. Tosimulate a 200-amp fault current, at a 2000:1 ratio, the testeroutput is adjusted to 100 mA.Initial conditionsControl1. Battery connected and control in lockout (verify withthe Lockout Test switch and/or Lockout Indicator,as applicable).2. Non-reclosing switch in NORMAL RECLOSING position3. Ground Trip switch in NORMAL position.4. Control settings programmed for desiredoperating conditions.Tester1. All switches and controls in their OFF or extremecounterclockwise position, except Test Selector switchS6 in BATT. VOLTS—(40 V).2. Power cord plugged into a 115-Vac grounded outlet.See CAUTION at beginning of OPERATINGPROCEDURES section.3. Cabinet of electronic control under test also grounded.4. Control connected to tester with the elbow plug of theappropriate test cable at the tester.otee:N If it is desired to monitor battery voltage during thecontrol tests, connect the battery to the tester withthe appropriate test cable.Control operation test (phase trip)To check the programmed sequence of operation of thecontrol for a phase fault, proceed as follows:1. Check that the control and tester settings are asspecified under INITIAL CONDITIONS.2. Set the control Ground Trip switch to BLOCK to disablethe ground-trip function while checking phase-tripoperation.3. Energize the tester by placing the ON/OFF Powerswitch S1 to ON. The green Recloser Simulator-Openlamp will light.4. Set the Ammeter Range switch S4 to the milliamprange equivalent to the programmed phase minimumtrip level.5. While holding the Fault Current switch S2 inCALIBRATE, advance the Fault Current Adjust controlTR1 to approximately 125—150% of the minimum triprating. Release S2.6. Set the Time Selector switch S3 to RECLOSERCLEARING, place Display Mode switch, S11, toUPDATE and the Auto Reset switch, S12, to ON. Resetthe timer.7. Move the Manual Control switch to CLOSE and release.The simulator will close in approximately 3/4 second;green OPEN light off, red CLOSE light on.8. Set Fault-Current switch S2 to TEST and compare thenumber of fast and delayed operations to lockout withthe programming of the electronic control.9. Repeat Steps 7, and 8 with Phase Selector switchS5 set at B and at C.10. Return the control and tester settings to INITIALCONDITIONS before proceeding to the next test.Control operation test (ground trip)To check the programmed sequence of operation of thecontrol for a ground fault, proceed as follows:otee:N To enable testing the ground-fault circuits of earlyForm 2 controls (below serial number 1615), a specialtest hookup is required. See Appendix C.1. Check that the control and tester settings are asspecified under INITIAL CONDITIONS.