Mitsubishi Electric MELPRO-A Series Instruction Manual
Directional earth fault relay
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- Instruction manual (19 pages)
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Summary of Contents for Mitsubishi Electric MELPRO-A Series
- Page 1 Request Ensure that this Instruction Manual is delivered to the end users and the maintenance manager. JEP0-IL9559...
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Page 2: Safety Precautions
－ Safety precautions － Before installation, operation, maintenance, and inspection, please be sure to read this instruction manual and all other attached documents thoroughly in order to work safely with the equipment. Please ensure that you fully understand the equipment, safety information, and precautions that need to be taken before working with the equipment. -
Page 3: Maintenance And Inspection
＊The equipment must only be operated and handled by qualified personnel. Otherwise, there are risks of electric shock, injury, failure, malfunction, and maloperation. ＊Handling and maintenance of the equipment must only be carried out after gaining a thorough understanding of the instruction manual. - Page 4 MITSUBISHI ELECTRIC CORPORATION prior to such applications. If the user applies MITSUBISHI ELECTRIC CORPORATION products to such applications without any contact to our technical section, MITSUBISHI ELECTRIC CORPORATION shall not be liable for any items and not be insured, independently from mentioned in this clause.
- Page 5 5. Onerous repair term after discontinuation of product (1) MITSUBISHI ELECTRIC CORPORATION shall accept onerous product repairs for 7 years after production is discontinued. (However, the product which was made over 15 years is recommended to replace.) (2) Product supply (including repair parts) is not available after production is discontinued.
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Page 6: Ratings And Specifications
3. Reset method of output contacts can be switchable setting values easily. between auto-reset and self-hold. 6. Panel cutout is the same as previous MELPRO-A series 4. The fault value record function is installed. and E series. Ratings and Specifications... - Page 7 Characteristics (MDG-A4V type relay ＋ MZT type ZCT combination) Item Characteristics Ambient temperature: –20 to +60℃ (Under the state where dew condensation or freezing does not occur) Relative humidity: 30 to 80% on daily average Standard use Altitude: 2000m or lower conditions ・The state where abnormal vibration, shock, and inclination are not applied.
- Page 8 Peak-to-peak amplitude mm Setting: Minimum operation value and Vibration (Acceleration m/s Frequency minimum operating time time (Hz) Forward/ Input: Rated auxiliary power supply Vibration Right/left Up/down backward and V Criteria: malfunction 5 (10) 2.5 (5) abnormal indication 16.7 0.4 (2) Maximum acceleration: 300m/s Shock Direction: 3 directions in forward/backward, right/left, and up/down...
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Page 9: Internal Connection Diagram
Structure Test button RUN indicated LED (Green) By turning the indicator select It shows the result of self- switch to "TEST" and pushing monitoring. It lights up in "TEST" button for 2 seconds or normal condition. more, output contact can be forced to operate (except for Numerical display LED the case of LOCK setting). -
Page 10: Operating Description
Operating Description 1. Protection function ③Phase measurement ①The power supply can be derived from VT secondary. The display shows the phase of zero-sequence ②Set using condition switches according to your current relative to the zero-sequence voltage. using condition (frequency and output contact). The display range is 0°to 359°(lag). - Page 11 External connection diagram (Example) Application value of EG-5 type current limiting resistance. System voltage EG-5 6.6KV 3.3KV Rating style No. 190V 191PHA 25Ω 50Ω 110V 192PHA 8Ω 16Ω Earthed voltage transformer (EVT) AC110V AC110V AC110V AC110V “MZT” “MZT” “MZT” MDG-A4V MDG-A4V MVG-A4V MDG-A4V...
- Page 12 Operation value settings and using condition settings 1. Operation value settings 2. Using condition settings The operation value settings should be set with due For all using condition setting switches, factory settings consideration given to various conditions of the systems, are set to a default of OFF.
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Page 13: Handling Precautions
Handling precautions 1. Panel mounting ②Please refrain from changing the setting value during ①Be sure to connect the "E" terminal of the relay to D- operation, since unwanted operation may occur. However, class grounding. if the setting change is unavoidable, please press the ②The relay of unit-drawer type (RD type) can be drawn CPU reset button in order to lock the relay function. - Page 14 3. Operation characteristics test [MDG+ZCT combination] ①In the field test, please apply I current from the primary side of ZCT (or test terminal: kt, ℓt). On the other hand, please apply V voltage to the input terminal of the relay directly. The example of test circuit is shown in Fig.
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Page 15: Terminal Layout
Terminal layout × 190V 110V × MDG-A4V-R/RD Do not connect to the "×" terminals, or the relay may not operate properly. Fig. 7-5 Terminal layout Drawing out and housing operation of subunit (Unit-drawer type) For unit-drawer type (RD type), it is possible to draw Before the subunit is to be drawn out, ensure that the out the subunit from the case without removing external following items are checked in order not to carry out the... - Page 16 1. Procedure of drawing out Cover Drawer fixing screw ① Open the cover and remove the ② Close the cover and pull out the ③ Support the frame of subunit and drawer fixing screw. subunit with your finger hooked pull out. on the drawer handle on both sides.
- Page 17 Handling of the cover 1. Opening and closing Please open the cover by placing your fingertip on the convex part in the right side of the cover as shown in Fig. 7-7. Fig. 7-7 2. How to replace the cover ･Removing the cover Open the cover, and lightly push up the upper side of the cover from the inner surface.
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Page 18: External Dimensions And Panel Cut-Out
External dimensions and Panel cut-out φ140～φ142 2-φ7 hole Minimum pitch Fig. 7-9 MDG-A4V-R (Unit: mm) Same as the center of panel cut-out Fig. 7-10 MDG-A4V-RD (Unit: mm) Improvement on the reliability of protection function Any parts and materials applied to the protection relay have limited lifetime which will bring the degradation to the relay. - Page 19 HEAD OFFICE ： 7-3 MARUNOUCHI 2-CHOME, CHIYODA-KU TOKYO, 100-8310, JAPAN First edition: Mar. 2021...