Mitsubishi Electric MELPRO-A Series Instruction Manual
Earth fault over voltage relay
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- Instruction manual (24 pages) ,
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- Instruction manual (22 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-IL9558...
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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
Caution However, this increase is limited only when all setting values easily. of the relays are composed of New MELPRO-A series. If 7. Panel cutout is the same as previous MELPRO-A series another series are combined, the number of connectable and E series. - Page 7 Characteristics (MVG-A3V type relay ＋ MPD-3 type ZVT 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 Apply damped oscillatory wave prescribed in JEC-2501 for 2 seconds. ・Between ZVT secondary and earth (E terminal) ・Between power supply terminal and earth (E terminal) ・Between terminals of power supply Noise-proof ・Between contact terminal and earth (E terminal) Setting: Minimum operation value and minimum operating time Input: Rated auxiliary power supply, V Criteria: No malfunction Intermittently irradiate radio waves to the front panel of the relay with a transceiver of 150MHz or 400MHz...
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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 ②Pickup ①The power supply can be derived from VT secondary. When input zero-sequence voltage is greater than ②Set using condition switches according to your or equal to the setting value, Ｕ. is displayed. using condition (frequency and output contact). This function can be used for operation value tests. - Page 11 External connection diagram (Example) MZT type MDG-A3V AC100/110V (DGR) ℓ Voltage tripping coil Pallet Auxiliary switch power supply MPD-3 type a11 a12 To alarm MVG-A3V circuit (OVGR) ●Connect line. Fig. 6-3 External connection diagram Note) In the figure above, the output contacts between DGR and OVGR are AND sequence circuits. It is also possible to use each relay individually.
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Page 12: Handling Precautions
Handling precautions 1. Panel mounting rated auxiliary power supply is input. If it still turns ①Be sure to connect the "E" terminal of the relay to D- off when the auxiliary power supply voltage exceeds 85V, class grounding. please contact our local agent and branch office since ②The relay of unit-drawer type (RD type) can be drawn the relay may fail. - Page 13 3. Operation characteristics test 4. Operation characteristic control point [ZVT combination] ①When the rated power supply voltage is applied, the RUN Perform the test periodically according to the following display LED (green) lights up. This indicates that the test conditions and criteria. relay works properly.
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Page 14: Terminal Layout
Terminal layout × × × × × MVG-A3V-R/RD Do not connect to the "×" terminals, or the relay may not operate properly. Fig. 6-4 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 15 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 16 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. 6-6. Fig. 6-6 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 17: External Dimensions And Panel Cut-Out
External dimensions and Panel cut-out φ140～φ142 2-φ7 hole Minimum pitch Fig. 6-8 MVG-A3V-R (Unit: mm) Same as the center of panel cut-out Fig. 6-9 MVG-A3V-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 18 HEAD OFFICE ： 7-3 MARUNOUCHI 2-CHOME, CHIYODA-KU TOKYO, 100-8310, JAPAN First edition: Mar. 2021...