Related Manuals for GE MLJ1000
Summary of Contents for GE MLJ1000
- Page 1 G G E E K K - - 105560 105560 GE Power Management MLJ1000 DIGITAL SYNCHRONISM CHECK RELAY “We bring good things to life”...
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Page 2: Table Of Contents
GEK - 105560 TABLE OF CONTENTS 1. DESCRIPTION ........................4 2. APPLICATION ........................5 2.1 DESIGN CHARACTERISTICS ..................5 2.2 APPLICATIONS ........................7 3. OPERATION PRINCIPLES..................... 11 3.1 CONFIGURATION UNIT ....................11 3.1.1 GENERAL Settings....................... 11 3.2 SYNCHRONISM CHECK UNIT ..................11 3.2.1 Mode of Operation ....................... - Page 3 GEK - 105560 6.1.4 F4: ∆θ Phase angle ...................... 25 6.1.5 F5: ∆ f Frequency Slip ....................25 6.1.6 F6, F7, F8, F9, and F10 Magnitudes recorded ............26 6.1.7 F11: TEST Display and inputs test ................26 6.1.8 F12: VL VB State of Line and buses ................26 6.2 SEQUENCE OF SETTINGS .....................
- Page 4 GEK - 105560 List of Figures (226B2202H2) ......35 IGURE OGICAL DIAGRAM OF PERATION (226B1276H1)..............36 IGURE AMEPLATE (226B6086H1) ........37 IGURE UTLINE AND PANEL DRILLING (226B3205H1)..........38 IGURE EAR TERMINAL PLATE (226B6265H1) ..........39 IGURE XTERNAL CONNECTIONS (301A7408H1) ............40 IGURE NTERNAL SETTINGS (226B2201H1)............41 IGURE LOCK IAGRAM The information provided herein does not intend to cover all details of variations of the...
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Page 5: Description
The basic MLJ1000 equipment and the equipment linkable via RS-485 is mounted in a 2-inch module, compatible with industrial MID systems, or in a 1/8 rack as an individual relay. -
Page 6: Application
GEK - 105560 2. APPLICATION 2.1 DESIGN CHARACTERISTICS Measurement accuracy The differential angle measurement of the MLJ is high precision and is limited solely by errors in available voltage transformers . The measurement of the angle is practically independent of the voltage. In the MLJ the measurement is obtained via a numerical calculation done on digital voltage samples, thus achieving high precision. - Page 7 GEK - 105560 There is also a time for sustaining the permission signal, which always has a fixed value of some 130 ms., being the result of a prefixed delay of 100 ms. added to the dropout time of the measurement units (one cycle = 20 ms.
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Page 8: Applications
GEK - 105560 2.2 APPLICATIONS Synchronism In general, synchronism check is intended primly for application where the two parts of a system to be joined by the closure of a circuit breaker are interconnected at other points throughout the system. Usually, performing synchronism check measurements is done with relatively long times in order to make sure the voltages are synchronized. - Page 9 GEK - 105560 In a large majority of cases, the typical slip can be set at around 20 to 40 mHz. This is the situation for short lines. In lines with short “dead times”, that is, immediate reclosing in the remote end, with very similar operation in case of internal faults in both circuit breakers and channel transmission times less than 25 ms, the slip setting may be set at 200 to 250 mHz.
- Page 10 GEK - 105560 Λ Λ Λ Λ Λ Λ Λ Λ Λ Λ t1 = Moment of detection of the fault in protections A and B. t2 = Tripping order of circuit breakers A and B (it may not happen at the same time). t3 = Opening of circuit breakers A and B (it may not happen at the same time).
- Page 11 GEK - 105560 Application of voltage As the MLJ is equipped with instantaneous undervoltage monitoring in two inputs (line and bus), and with undervoltage and overvoltage levels (live and dead), it can be used as a relay in a large number of applications such as: •...
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Page 12: Operation Principles
GEK - 105560 3. OPERATION PRINCIPLES The MLJ can be described as the function of a group of different units, each being responsible for one part of the overall operation. 3.1 CONFIGURATION UNIT The configuration unit allows us to select and change the following parameters: •... -
Page 13: Mode Of Operation
GEK - 105560 3.2.1 Mode of Operation Using an analog to digital converter, samples of line and bus voltages are acquired. From the samples, and applying the discrete Fourier transform (DFT), the module and argument of both magnitudes are obtained, and from them, the voltage and angle differences. With the measurement of the period, the frequency slip is obtained. -
Page 14: Settings
GEK - 105560 3.2.2 Settings The synchronism unit is assigned the following settings: 1-1: ∆V: Voltage difference (modulus of vector difference). Range: from 2 to 90 in steps of 0.5 Units: volts Default value: 15 1-2: ∆θ: Angle Range: from 2 to 60º in steps of 1 Units: degrees Default value: 10 1-3: ∆f;... -
Page 15: Undervoltage Unit
GEK - 105560 3.3 UNDERVOLTAGE UNIT Besides the undervoltage described in and linked with the synchronism unit, there is an independent unit which has various undervoltage and overvoltage functions to allow for the closure of the circuit breaker in dead lines and/or bus situations (see figure 1). 3.3.1 Mode of Operation The modulus are calculated from the line and bus voltage phasors and then compared with the settings. -
Page 16: Input Units
GEK - 105560 4-4: LLDB ON-OFF: Activation condition: live line with dead bus (LLDB). Range: Enabled or disabled. Units: -- Default value: OFF (Disabled) NOTE : The relay does not check to see if the live line setting (3-1) is greater than the dead line setting (3-2). -
Page 17: Output Units
GEK - 105560 The codes for failures are: 0.0. No defects 8.0. ROM failure. The program memory has failed. 8.1. Writing failure to EEPROM 8.2. RAM program failure 0.1. Setting failure. The settings stored are incorrect. This error is also shown when the EEPROM memory is new (in which case the settings are stored by default). -
Page 18: Power Supply
GEK - 105560 Default value: 25 (synchronism) Configuration: second auxiliary output 5-2 2: Range: PEr, 25, 27, _dL, db_, F25, ALA Units: -- Default value: 27 (undervoltage) 3.7 POWER SUPPLY The power supply circuit of the MLJ generates, from the auxiliary voltage, the internal voltages necessary for the operation of the relay. -
Page 19: Technical Characteristics
GEK - 105560 4. TECHNICAL CHARACTERISTICS 4.1 MODEL LIST Here is the information required to completely define the MLJ models. (See chart below): MLJ 100 _ A010 _ 00 _ Communications Auxiliary and inputs voltage Case 0 - No communications F - 24/ 48 Vdc C - In individual case 5 - RS-485... -
Page 20: Insulation
GEK - 105560 • ALARM AND AUXILIARY CONTACTS Break: 1760 VA Maximum continuous voltage: 250 Vdc Maximum alternating voltage: 380 Vac Make and carry: Carry continuously: • ACCURACY Voltage: 2% or 0.5 V Voltage difference: 3% or 1 V Angle difference: 1º... -
Page 21: Type Tests
Shock test According to IEC 255-21-2, class II. The MLJ relay complies with these regulations, which include the GE standard of insulation and electromagnetic compatibility and the standards required for the Community Standard 89/336 for the European Community CE label, under the harmonized European regulations. It also complies with the European directive requirements for low voltage, and the environmental and operative requirements established in regulations ANSI C37.90, IEC 255-5, IEC 255-6 and IEC 68. -
Page 22: Description Of Hardware
GEK - 105560 5. DESCRIPTION OF HARDWARE 5.1 CASE The case of the MLJ is made of steel plate, with an anti-corrosion treatment and painted with epoxy powder paint. The standard dimensions are shown in figure 3. The front cover is made of a transparent plastic material fitted tightly to the case, forming a seal that prevents dust from entering and protects it from any accidental tampering. - Page 23 GEK - 105560 Displays Three red seven segment displays (LED type) are used to supply information to the user and to make it easier to set the relay. LEDs In addition to the displays described above, there are three LEDs which provide the following information: •...
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Page 24: Operation Of Mlj (Keypad And Display)
GEK - 105560 6. OPERATION OF MLJ (KEYPAD AND DISPLAY) The MLJ is operated by means of three push-buttons located on the front. These buttons are lined up vertically and, from top to bottom; they are “ENTER”, “+”, and “–”. The first button is indicated with an arrow (see figure 2), although throughout this manual it is referred to as ENTER. -
Page 25: Readout Sequence
GEK - 105560 6.1 READOUT SEQUENCE This is the typical sequence for the MLJ as well as the power-up sequence. It is divided into a series of “Functions”, each corresponding to different types of information. These functions are numbered from 1 to 12 and are identified by the letter F followed by the number of the function. -
Page 26: F0: State Of Relay, Error Codes
GEK - 105560 6.1.1 F0: State of relay, error codes The state of the MLJ presented by a two-digit code. The decimal points remain lit so as to distinguish the code from other readings. A 00 code (everything correct) would be represented as follows: The state codes for the MLJ, in order of priority, are: 0.0. -
Page 27: F6, F7, F8, F9, And F10 Magnitudes Recorded
GEK - 105560 6.1.6 F6, F7, F8, F9, and F10 Magnitudes recorded When close enable is given, whether by synchronism or undervoltage, the relay registers of certain measured magnitudes at that moment. Later, when so desired, in the Reading Sequence they can be viewed with the following functions: F6: LAST VL F7: LAST VB... - Page 28 GEK - 105560 In the first two situations we can go forward or backward throughout the entire list of settings by simply pressing the “+” or the “-” button. On the nameplate, under the word “SETTINGS” a complete list can be found.
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Page 29: Calibration Sequence
GEK - 105560 6.3 CALIBRATION SEQUENCE Under normal conditions, the relay will not need to be calibrated. The calibration of this protection is done in the factory in a controlled environment with high precision equipment. Therefore, not only is it unnecessary to recalibrate the relay, but also not recommended. The relay has a single gain calibration by means of a potentiometer (see figure 6). -
Page 30: Summary Of Settings
GEK - 105560 6.4 SUMMARY OF SETTINGS Following, is a table containing a summary of all the settings of the MLJ relay. In addition to the description and the setting code, the allowable values, step and default value (the value the relay comes with from the factory) are indicated. - Page 31 GEK - 105560 Going to settings sequence Going to readout sequence Note: N.A. Not applicable TABLE 2 CONFIGURATION OF OUTPUTS FUNCTION NAME FUNCTION OPERATION Close enable Synchronism Undervoltage Dead line Dead bus Fail to close Alarm If while in Readout Sequence, the ENTER and “+” buttons, are pressed simultaneously, the word CAL will appear briefly on the screen, followed immediately by the average value of the line and bus voltages.
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Page 32: Acceptance Tests
GEK - 105560 7. ACCEPTANCE TESTS 7.1 INTRODUCTION Given the digital nature of this relay, in most occasions making sure that the relay measures correctly will guarantee proper performance, since all of the logic of measurement and protection is implemented by means of programming. In order to do this, the voltages in the line and bus need only to be measured with a multimeter and make sure they coincide, within the specified accuracy, with the reading indicated on the screen. -
Page 33: Voltage Unit Test
GEK - 105560 visualized by applying a voltage greater than 10 V to the line and the buses. The readout should be 0 mHz. 7.4.1 Voltage unit test The setting by defect is used for the voltage difference; In this case 15 V. Apply continuous voltage to input 52b (simulates open circuit breaker). -
Page 34: Continuous And Manual Mode Tests
GEK - 105560 7.6 CONTINUOUS AND MANUAL MODE TESTS With the default settings, the delay in continuous mode is 0.1 s and in manual mode it is 10 s. This helps to know when the relay acts in one mode or the other. Manual mode Apply continuous voltage to inputs MANUAL, ENABLE and 52b. - Page 35 GEK - 105560 the dangerous ones since people are touching the ground, normally through their footwear and the floor of the installation. • Protection of the relay’s internal circuits against overvoltage. Overvoltage which can reach the relay by connections (power supply circuit, output contacts, etc.) tend to be the so-called common or longitudinal mode;...
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Page 36: Figure 1 Logical Diagram Of Operation (226B2202H2)
GEK - 105560 Figure 1 Logical diagram of Operation (226B2202H2) -
Page 37: Figure 2 Nameplate (226B1276H1)
GEK - 105560 Figure 2 Nameplate (226B1276H1) -
Page 38: Figure 3 Outline And Panel Drilling (226B6086H1)
GEK - 105560 Figure 3 Outline and panel drilling (226B6086H1) -
Page 39: Figure 4 Rear Terminal Plate (226B3205H1)
GEK - 105560 Figure 4 Rear terminal plate (226B3205H1) -
Page 40: Figure 5 External Connections (226B6265H1)
GEK - 105560 Figure 5 External connections (226B6265H1) Note: The transformers can be connected to single or compound voltage. -
Page 41: Figure 6 Internal Settings (301A7408H1)
GEK - 105560 Figure 6 Internal settings (301A7408H1) -
Page 42: Figure 7 Block Diagram (226B2201H1)
GEK - 105560 Figure 7 Block Diagram (226B2201H1)