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

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ABB CM-UFD.M33 Solar Protection Relay
BCJ Controls
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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.

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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

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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

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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BCJ Controls

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