remote control equipment - Indian Railways Institute of Electrical ...

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scheme 6. Auxiliary relay for VAA-61 Auto reclosing scheme 7. High speed Master trip VAJH-13 relay 8. High speed inter trip VAJH-13 relay 9. Auxiliary relay for VAA-43 Buchholz oil temp/ winding temp/low oil alarm 10. Alarm annunciation relay VAA-121 5.8 SCHEME OF PROTECTION FOR 132/25 KV OR 110/25 KV OR 66/25 KV TRANS- FORMER 5.8.1 Differential protection Protection against internal fault shall be provided by means of a senstive single-pole diffrential relays. The relays shall be of the high speed type and shall operate in less than two cycles.The relays shall incorporate the following feature i) There shall be no necessity for changing the setting of relays when the transformer tap is changed.The transformer is provided with tap from -15% to +10%. ii) Necessary harmonic restraining feature shall be incorporated to prevent operation due to in rush of magnetisation current when the transformer is charged either from the HV or the LV side. iii) The relays shall not operate for maximum through fault current. iv) The current setting of the relays shall be adjustable, preferably between range of 20% and 80%.The minimum current setting shall be as low as possible to obtain better senstivity. v) Adjustable bias setting should also be provided .The bias at minimum operating current setting shall be 20%,30% or 40% to suit the tapping range of the traction transformer and other designed considerations. The relays shall be connected to bushing type current transformer provided in the bushings of 132/25 kV,110/25kV transformer.However,interposing current transformers of suitable ratio and ratig with matching charcteristics of knee point voltage , excitation current etc. shall be provided with the diffrentialrelays in order to boost up the bushing CTs secondary current, at full load, to a value equal to relays rated current.Magnetisation ratio error curves for the crrent transformers 103
will be supplied to the successful tenderer to enable him to match the characteristics of the relays and iterposing CTs with those of the current transformer. 5.8.2 Earth Leakage Protection Back up protection for internal earth fault within the transformer shall be provided by means of a senstive ,high speed ,earth leakage. Such relays shall be provided separately for both the primary and secondary side the relays shall be connected to separately mounted current transformer.The relays shall be adjustable between 20% and 40% of 5Amps in equal step at 5%. The relays shall be of T-10 class with operating time not exceeding 10 ms. 5.8.3 Over current protection Protection against over current in the transformer shall be provided by means of singlepole non directional overcurrent relays with inverse definite minimum time lag characteristics both on the primary and the secondary side of the transformer.Further an additional instantaneous over current relays shall be provided on the primary side. On the primary side the over current relays shall be connected to separately mounted current transformers. On the secondary side the over current relays shall be provided only on the live (unearthed) leg of the secondary terminal and shall be connected to a seprately mounted current transformer.The overcurrent relay on the secondary side shall serve as back up protection against fault etc.The over current relays on the primary side shall serve as back up to the diffrential and earth leakage relays against heavy fault. Proper discrimination shall be maintained in the operation of these two sets of overcurrent relays. The setting on these relays shall be adjusted between Relay Position current Time multiplier setting setting i) IDMT overcurrent 80% to320% 0 to 3 secs. on primary side ii) Instantaneous over 400% to 1600% current on primary side. iii) IDMT overcurrent 80% to 320% 0 to 3secs. on secondary side. The instantaneous relays shall be of T10 class with operating time not exceeding 10 ms at 5 timesthe current setting. 5.8.4 The diffrential relays and earth lekage relays both on the primary and secondary sides as also the over current relays on primary side shall cause inter-tripping of the 132/110/ 66KV and 25KV circuit breakers associated with the transformer.The inter-tripping of the associated transformer circuit breakers on HV and LV side shall also be effected due to other faults in the transformer ,namely Buchholz trip. The IDMT over current relays on the secondary side shall, however, trip the respective circuit breaker on 25KV side only.The inter-tripping of associated transformer circuit breakers envisaged above shall be effected through a high speed tripping relay with ‘hand reset contact.Such inter tripping relay shall lock out the closing of circuit breaker from all mode of closing commands viz. remote control,local at the panel and also at the circuit breaker mechanism, until the inter-trip relay or the lock out relay (if provided separately),is reset manually. 104
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PREFACE The book on "Power Supply I
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However transformers of capacity 13
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3. To keep the unbalance on the 3 p
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1.2 POWER SUPPLY FOR SIGNALLING 1.2
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locomotives and Electric Multiple U
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2.0 Supply System 2. POWER SUPPLY F
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figures. This charge should be real
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2.4 Scrutiny of Bills have a bearin
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c) Procedure to be followed in case
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In the territorial setup one Subord
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3.2.3 Over load Capacity of Tractio
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B. Insulation resistance will conti
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3.3. GUIDING NOTES ON MAINTENANCE 3
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f) Fully push home the wedges betwe
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eakers/interrupters should also be
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A detail history of every battery s
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light or bluish grey according to a
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(e) Overhaul, bench tests and calib
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3.5. FORTNIGHTLY MAINTENANCE 3.5.1.
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obstruction and also if the shock a
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2. Test a sample of oil for BDV. 3.
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3. Check if the terminations of the
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Fortnightly Schedule: a) Drain wate
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d) Measure the IR between auxiliary
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TRACTION DISTRIBUTION SCHEDULE OF M
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3.0 Inspection of Traction Sub-stat
Page 55 and 56: 4.0 Switching Stations a) Switch Ya
Page 57 and 58: SI. No . APPLICATION AND INTERPRETA
Page 59 and 60: 2.2 Oxidation Carbondioxide is the
Page 61 and 62: 3.4 Pattern of generation of gases
Page 63 and 64: TABLE - I SOLUBILITY OF DIFFERENT G
Page 65 and 66: TABLE V ROGER'S METHOD OF DIAGNOSIS
Page 67 and 68: 1.1 Schedules MAINTENANCE OF SF6 CI
Page 69 and 70: Point / Location Tripping Mechanism
Page 71 and 72: 1.0 General Annexure 3.05 MAINTENAC
Page 73 and 74: 1.5 Detailed Check Checking shall b
Page 75 and 76: DESIGN ASPECTS OF TRACTION SUBSTATI
Page 77 and 78: • Characteristics of the locomoti
Page 79 and 80: considerations enlisted in para 4.0
Page 81 and 82: xii) Load losses 135.0 kW xiii) Cur
Page 83 and 84: item Nominal System Voltage 66kV 11
Page 85 and 86: 20 1250 1600 2000 245 31.5 1250 160
Page 87 and 88: i) Three post, centre post rotating
Page 89 and 90: etween live parts and different pot
Page 91 and 92: 4.11.5 Design of grounding system 4
Page 93 and 94: 4.12.2 BIL of various equipments us
Page 95 and 96: (d) High speed inter tripping relay
Page 97 and 98: The relay continuously monitors the
Page 99 and 100: SULFUR HEXAFLUORIDE(SF6) GAS 96 ANN
Page 101 and 102: 5.0 POWER SUPPLY SYSTEM PROTECTION
Page 103 and 104: any one of the two sub-staion throu
Page 105: fault relay (132KV&25KV side) 4. ID
Page 109 and 110: detected by normal distance protect
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Page 125 and 126: Just as the requirements of supervi
Page 127 and 128: The use of hermetically sealed comp
Page 129 and 130: The configuration used in Railway S
Page 131 and 132: This may be accomplished by several
Page 133 and 134: A typical example of commonly used
Page 135 and 136: 7.2.6.2The above sequence of messag
Page 137 and 138: 7.3 SCADA EQUIPMENT 7.3.1 General T
Page 139 and 140: 7.3.10 SCADA Software The operating
Page 141 and 142: systems are different, the basic fe
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Page 145 and 146: To combat interference, co-ordinate
Page 147 and 148: e = Er / R were introduced in the v
Page 149 and 150: It is seen that even if the lines a
Page 151 and 152: Fig. 8.3 Fig. 8.3 contains a family
Page 153 and 154: Typical Rail Current Distribution F
Page 155 and 156: 8.8 SUPPRESSION OF INTERFERENCE AT
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Magnetizing current is required to
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REGULATION FOR ELECTRICAL CROSSING
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Kc is cable screening factor and it
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