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The ABB CM-UFD.M33 Solar Protection Relays | Zero Export

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The ABB CM-UFD.M33 is a monitoring relay with multifunctioning grid feeding. It is able to trip the section switch connected between the distributed generation and the public grid allowing the distributed generation to disconnect in case of problems, faults, or grid maintenance. Visit us for more details: – PowerPoint PPT presentation

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Title: The ABB CM-UFD.M33 Solar Protection Relays | Zero Export


1
ABB CM-UFD.M33 Solar Protection Relay
BCJ Controls
2
Description
  • The ABB CM-UFD.M33 is a multifunctioning grid
    feeding monitoring relay. It trips the section
    switch that is connected between the distributed
    generation and the public grid allowing the
    distributed generation to disconnect in case of
    problems (e.g. unstable grid), faults, or grid
    maintenance.
  • The device provides different monitoring services
    to detect 10-minutes average overvoltage, real
    time over- and under-voltage as well as over- and
    under-frequency. Additionally, monitoring of
    vector shift and ROCOF (rate of change of
    frequency) can be configured to trip the
    generation in a case of loss of mains.

3
ABB CM-UFD.M33 Characteristics
  • Monitoring of voltage and frequency in
    single-phase and three-phase mains (2-wire,
    3-wire or 4-wire AC systems).
  • Over- and under-voltage, 10-minutes average value
    as well as over- and under-frequency monitoring.
  • Two-level threshold settings for
    over-/under-voltage and over-/under-frequency.
  • ROCOF monitoring and vector shift detection are
    configurable.
  • Interrupted neutral detection.
  • Default settings in accordance with Great Britain
    Engineering Recommendations G59/3 and G83/2

4
ABB CM-UFD.M33 Characteristics
  • True RMS measuring principle
  • All threshold values and tripping delays are
    adjustable
  • Error memory for up to 99 entries (incl. cause of
    error, measured value, relative timestamp)
  • Password setting protection
  • 3 control inputs (e.g. for feedback signal,
    remote trip)
  • 3 c/o (SPDT) contacts
  • Multiline, backlit LCD display

5
ABB CM-UFD.M33 Application
  • The ABB CM-UFD.M33 is a grid feeding monitoring
    relay that monitors the voltage and the frequency
    of the public low or medium voltage grid.
    Whenever measured values are not within the range
    of adjusted threshold values, the ABB CM-UFD.M33
    causes the section switch to trip (consisting of
    1 or 2 switching devices according to the
    applicable standard). This tripping disconnects
    the power generation of systems such as
    photovoltaic systems, wind turbines, and
    block-type thermal power stations from the grid.
    The fault is indicated by a LED and the
    corresponding plain text failure message is
    displayed.

6
Operating Mode
  • The ABB CM-UFD.M33 can be set up to monitor
    single-phase and three-phase mains (2-wire,
    3-wire as well as 4-wire AC systems). The unit is
    configurable by front-facing push-buttons. A
    display with the corresponding menu enables the
    selection of preset settings as well as the
    precise adjustment of the various threshold
    values and corresponding time delays.
    Furthermore, the display portrays the measured
    values clearly. Along with the front-facing LEDs,
    it shows all information about operational states
    of output relays and control inputs.

7
Operating Mode
  • The ABB CM-UFD.M33 provides three output relays
    and three control inputs. Output relays R1
    (1115-1216/1418) and R2 (2125-2226/2428) are
    needed for disconnection of a distributed
    generation system from the public grid. The
    corresponding feedback signals from the external
    contacts are monitored using the control inputs
    Y1-Y0 and Y2-Y0. The third output relay R3
    (3135-3236/3438) can be used for to command the
    close of a motor drive for circuit breaker or as
    signalization of output relays R1 and R2. The
    additional control input Y3-Y0 allows tripping of
    the grid feeding monitoring relay remotely. With
    control input Y3-Y0 it is possible to suppress
    both input Y1-Y0 and input Y2-Y0 or the vector
    shift detection.

8
Protective Functions
  • If control supply voltage is applied, then all
    phases are present and the switch-on conditions
    for voltages and frequency are fulfilled. Output
    relays R1 and R2 energize synchronously after the
    altered switch-on delay. The green LED U/T
    flashes during timing and becomes steady when the
    switch-on delay is complete. If a measured value
    is above or below the set threshold value
    (overvoltage, under-voltage, over-frequency,
    under-frequency, ROCOF or vector shift), R1 and
    R2 de-energize after the altered tripping delay.
    As soon as the value returns to the tolerance
    range taking into account an adjustable
    hysteresis and all further switch-on conditions
    are fulfilled, R1 and R2 re-energize. The fault
    is indicated by the red LED F and the type of
    fault is shown in plain text on the display. The
    event that caused the relay to trip is recorded
    in the event list. The green LED U/T flashes
    during timing and turns steady when the delay is
    complete.

9
Output Relay R3 (3135-3236/3438)
  • Output relay R3 can be used to command the
    closing of a breaker motor. For this function,
    either of the working principles closed-circuit
    or open-circuit must be selected. When output
    relays R1 and R2 energize, the altered ON-delay
    starts. When the timing is finished, R3 will be
    activated for the ON-time duration or until R1
    and R2 de-energize. Additionally, R3 can be
    configured as either synchronous with R1/R2 or
    disabled. For these two configurations, the
    ON-delay and the ON-time settings have no
    influence on the operating function.

10
Control inputs Y1-Y0, Y2-Y0
  • The control inputs, Y1-Y0 and Y2-Y0, are used as
    feedback contacts for the two switching devices
    of the section switch. The current status for the
    switching devices is monitored by the grid
    feeding monitoring relay. The control inputs
    configuration for the working principle can be
    set as normally closed, normally open, auto
    detection, or completely disabled. A failure
    in the feedback loop has to be manually removed
    on the device. Please note 1. Normally here
    refers to good status of the grid, this is when
    all the monitored voltages and the frequency stay
    within set threshold values and the output relays
    R1 and R2 are energized. 2. The grid feeding
    standards vary for different countries.

11
Control inputs Y1-Y0, Y2-Y0
  • Some require that a section switch consists of
    two independent switching devices, while others
    only require one switching device working as a
    section switch. In addition, monitoring of the
    switching devices by the feedback monitoring is
    not required by all standards. For this reason,
    the monitoring functions of control inputs Y1-Y0
    and Y2-Y0 are disabled by default. They can be
    enabled manually in the menu. The function of
    control input Y3-Y0 can be configured as remote
    trip, suppress Y1, suppress Y2, suppress
    Y1/Y2, or suppress vector shift detection. The
    working principle of the control input can be
    configured as normally open, normally closed,
    or completely disabled.

12
Control inputs Y1-Y0, Y2-Y0
  • Remote trip With Y3-Y0 configured as normally
    closed, output relays R1 and R2 de-energize if
    Y3-Y0 is open, and vice versa.Suppress Y1,
    suppress Y2, suppress Y1/Y2 These functions can
    be used to suppress evaluation of the chosen
    feedback loop during generator synchronization,
    so that the status of the feedback signal wont
    be considered a feedback error. A different
    solution is to make the release window of the
    corresponding feedback loop larger than the
    possible duration of synchronization process.

13
ROCOF (Rate of Change of Frequency df/dt)
  • Output relay R3 can be used to command the
    closing of a breaker motor. For this function,
    either of the working principles closed-circuit
    or open-circuit must be selected. When output
    relays R1 and R2 energize, the altered ON-delay
    starts. When the timing is finished, R3 will be
    activated for the ON-time duration or until R1
    and R2 de-energize. Additionally, R3 can be
    configured as either synchronous with R1/R2 or
    disabled. For these two configurations, the
    ON-delay and the ON-time settings have no
    influence on the operating function.

14
Vector Shift Detection
  • This function is another possible way of
    detecting a loss of mains (islanding). The vector
    shift detection is enabled by default and can be
    disabled manually in the menu. Through zero
    crossings, the device detects the vector shift of
    mains voltage and de-energizes output relays R1
    and R2 instantly if the shift exceeds the
    adjusted threshold value (e.g. 12 ). Only after
    the set error time will the switch-on conditions
    be evaluated in order to start an auto
    re-connection.

15
Switch-On Conditions
  • In order to turn on the section switch after
    applying control supply voltage or after a fault,
    the voltages and the frequency must stay within
    the set switch-on conditions during the switch-on
    delay. This window of voltage and frequency can
    be restricted more in the menu Switch-on
    conditions. If one parameter exits the window,
    the switch-on process is interrupted. When all
    parameters fulfill the switch-on conditions
    again, the switch-on delay restarts. When the
    switch-on time is finished, relays R1 and R2
    re-energize automatically. If the function Short
    interruption is enabled in the menu Switch-on
    conditions -gt Switch-on delay, the switch-on
    delay will be reduced to 5 s in case of an
    interruption of less than 3 s.

16
Interrupted Neutral Detection
  • Interrupted neutral detection is active whenever
    one of the phase-neutral measuring principles is
    selected in the menu Nominal voltage. The
    interruption of the neutral conductor will result
    in an instant tripping of the output relays R1
    and R2.

Automatic Reconnecting Attempts
  • If an error occurs at feedback loop Y1-Y0 or
    Y2-Y0 (e.g. under-voltage release because of a
    lightning strike), between zero and three
    automatic reconnecting attempts will be carried
    out, accounting for the switch-on conditions.
    Therefore a temporary feedback error doesnt need
    to be handled manually. The corresponding error
    in the feedback loop is stored in the error list.

17
Test Function
  • The test function can be used to simulate an
    error in the installation, so that the time
    delays of the feedback loops can be determined. A
    feedback loop includes the output relay, the
    corresponding switching device, and the feedback
    contact. The test function can be started by
    pressing the ESC button for 3 s. The output
    relays R1 and R2 de-energize immediately and the
    ABB CM-UFD.M33 gets feedback signals from the
    section switch through control inputs Y1-Y0 and
    Y2-Y0 respectively. The time intervals from
    de-energizing both output relays to receiving
    both feedback signals is displayed. The menu is
    returned to by confirming with the OK button.

18
BCJ Controls Protection Relays Specialist
  • When you have a large solar system connecting to
    the grid, the utility requires special
    precautions to keep the grid safe. For that you
    need a 'Grid Protection System' - it is what
    stands between your solar system and the
    electricity grid. BCJ Controls helps solar
    installers navigate the grid connection process
    to get the system on-line.
  • We start by supplying a design for the Grid
    Protection System to use to apply to the utility
    (aka. DNSP) including information about the
    network protection relay or zero export device.

19
BCJ Controls
  • http//bcjcontrols.com.au/
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