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GE Consumer & Industrial
Multilin
DBT
Digital Trip Coil Supervision Relay
Instruction Manual
GEK-105597C
Copyright © 2004 GE Multilin
GE Multilin
215 Anderson Avenue
L6E 1B3 Markham, ON -CANADA
Tel: (905) 294 6222 Fax: (905) 294 8512
GE Multilin
Avda. Pinoa, 10
48170 Zamudio SPAIN
Tel: +34 94 485 88 00 Fax: +34 94 485 88 45
E-mail: [email protected]
E-mail: [email protected]
Internet: www.gemultilin.com
TABLE OF CONTENTS
TABLE OF CONTENTS
1. DESCRIPTION
3
2. APPLICATION
5
2.1
2.2
2.3
2.4
5
5
5
6
DIRECT CONNECTION TO COIL
USE AS A DC UNDERVOLTAGE RELAY
DIFFERENT CONNECTIONS FOR INDEPENDENT BATTERIES
RECOMMENDED SETTINGS
3. MODEL LIST
7
4. OPERATING PRINCIPLES
9
5. TECHNICAL CHARACTERISTICS
11
5.1 TECHNICAL CHARACTERISTICS
5.3 TYPE TESTS
11
12
6. RELAY SETTINGS
15
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
15
16
16
16
17
17
17
18
‘READY’ LED
‘ENABLE’ SWITCH
‘RESET TARGET’ SWITCH
LED INDICATORS
COIL RESISTANCE SETTING
VOLTAGE SETTING
TIME DELAY SETTING ADJUSTMENT
SUMMARY TABLE OF SETTINGS
7. RECEPTION TESTS
19
7.1
7.2
7.3
7.4
7.5
7.6
19
19
20
21
22
22
VISUAL INSPECTION
INSULATION
TRIP LEVEL TEST
TIME DELAY TEST
RESISTANCE MEASUREMENT TEST
ENABLE TEST
GEK-105597C
DBT Digital Trip Coil Supervision Relay
1
TABLE OF CONTENTS
LIST OF FIGURES
Figure 1
Nameplate (226B1298H3)
Figure 2
External connections - one coil model (226B6291H5)
Figure 3
External connections - three coils model(226B6291H4)
Figure 4
External connections – model DBT3000A*0H02 (226B6291H6)
Figure 5
Mechanical dimensions and cut-out (226B6086H11)
Figure 6
Rear terminal plate (226B6292H1)
Figure 7
Block diagram (226B2209H1)
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DBT Digital Trip Coil Supervision Relay
GEK-105597C
DESCRIPTION
1. DESCRIPTION
The DBT is a digital trip coil supervision relay. This supervision includes:
•
•
•
Integrity of coils (monitoring continuously their resistance). In case coils are in a good condition, the output COIL
OK will be activated.
Control voltage (supervision of low voltage). If voltage is correct, the output BREAKER VOLTAGE OK will be
activated.
Checks the breaker control circuit. If both control voltage AND coils integrity are correct, then the output
BREAKER CIRCUIT OK will be activated.
Note: The activation of a NO (Normally Open) output means contacts will be closed, whereas the activation of a NC
(Normally Closed) output means contacts will be opened.
In its single-coil version, the DBT monitors coil continuity whether the breaker is open or closed. It also has a timing
device to avoid indicating failure signals during opening to closing transitions.
The three-coils version of the DBT can monitor three coils at a time, regardless of the position of the breaker, and
with timer delay for transitions.
In addition to coil monitoring, both versions (single- and three-coil) have a continuous DC undervoltage function to
monitor the battery’s power supply.
The supervised coils can be either the tripping or the closing ones, futhermore, in the three-phase version coils can
be coming from different breakers. Instead of measuring the continuity of the circuit (like other relays), the DBT
measures real resistance. It injects a current of 5 mA, limited to a maximum of 24 V. By measuring the voltage drop
in the coil the DBT calculates the resistance.
Figure 3 shows a typical three-coil DBT connection to a coil. In this way the relay can measure the coil resistance at
any time (in reality, the association of the breaker coil with any other auxiliary coils), either by the 52/a type contact, if
the breaker is closed, or the 52/b type if it is open. The relay also measures the breaker power supply at terminals B1
and B2.
The advantage of measuring real resistance is in selectivity, as failures in trip circuits can be detected apart, even in
cases where auxiliary circuit coils are connected in parallel. In these situations a break or interruption of the breaker
coil would not be detected by a continuity measurement because the auxiliary coils would create an alternative path
to the current flow. On the other hand, a resistance measurement like that made by the DBT is a valid procedure
because the resistance will rise when the breaker coil fails.
An extra advantage of the DBT is in its limitation of current sources to a maximum of 24 V, which avoids the DBT
operating other high impedance auxiliary circuits. This kind of circuits run the risk of being enabled by the low level of
milliamperes injected by conventional monitoring relays.
When maintenance work is carried out on the breaker, a disable switch available on the front of the relay should be
operated in order to deactivate all the outputs. The effect produced is similar to a lack of continuous auxiliary voltage
as shown in figures 2 and 3.
This inhibition can also be done by energizing a digital input. The three-coil model has four inputs and the single-coil
model just one.
GEK-105597C
DBT Digital Trip Coil Supervision Relay
3
DESCRIPTION
4
DBT Digital Trip Coil Supervision Relay
GEK-105597C
APPLICATION
2. APPLICATION
The DBT has been designed to monitor the biggest possible number of elements in the tripping and closing circuits of
the breaker. The relay checks voltages, coil resistance and the integrity of the auxiliary contacts 52/a and 52/b, since
they are also part of the trip and close circuits of the breaker.
For safety reasons, in order to avoid signalling BREAKER CIRCUIT OK when auxiliary voltage is low, it is strongly
recommended using a NO output. When using a NO output the DBT protection will energize that relay and will
CLOSE that output contacts if both voltage and coil are correct. When auxiliary voltage is low (or null) or there is a
failure in the breaker coil circuit, that output will be OPENED, indicating breaker circuit failure.
2.1 DIRECT CONNECTION TO COIL
Although there are two connections for each coil (one through 52/a and the other through 52/b) these cannot be used
for two different coils because the relay compares the resistance measured by each contact. A three-phase relay is
designed to monitor up to 3 coils and a single-phase relay just one.
If, for whatever reason, there is a need to make a direct connection to the coils without going through contacts 52/a
and 52/b (in this case monitoring of these would be lost), it can be done. The connection of the coil at the input of
52/a has to be wired and leave input 52/b unconnected.
2.2 USE AS A DC UNDERVOLTAGE RELAY
If you only want to use the undervoltage unit this can be done by simply disabling the coil monitoring units.
This inhibition is done by connecting inputs 52/a (terminals B3, B5 and B7 on the three-phase model, terminal B3 on
the single-phase) to the negative of the breaker power supply (terminal B2), leaving inputs 52/b unconnected
(terminals B4, B6 and B8 of the three-phase, B4 of the single-phase).
Once the resistance monitoring is disabled, when undervoltage condition occurs the BREAKER VOLTAGE OK and
the BREAKER CIRCUIT OK contacts will become deactivated.
2.3 DIFFERENT CONNECTIONS FOR INDEPENDENT BATTERIES
Although the installation has just one battery, voltage can be distributed through different circuits (each one protected
by a MCB). If you connect the auxiliary voltage (terminals B9-B10) to a different circuit from the breaker power supply
circuit (terminals B1-B2), in the event of an incident in the breaker power supply (where the MCB trips) the DBT
continues working and is fully operative. This gives us the necessary information regarding BREAKER VOLTAGE OK
and BREAKER CIRCUIT OK.
When the auxiliary voltage fails the DBT gives a warning through the ALARM contact.
GEK-105597C
DBT Digital Trip Coil Supervision Relay
5
APPLICATION
2.4 RECOMMENDED SETTINGS
This section is only included for customer information, given the importance of the right choice of settings to ensure
good protection and a range of possible applications.
Resistance
Because the coil is made of copper its resistance varies considerably with temperature. The temperature coefficient
of copper is approximately 0.43%/ºC (see UNE 20-003 “Annealed and industrial copper for electrical applications”).
This means that, at an ambient temperature of 0ºC, resistance is 8.6% lower than that measured at an ambient
temperature of 20ºC.
Furthermore, the resistance of cables connected to resistance measurement inputs of the relay can vary the
resistance measured by the DBT (as a result of common mode impedance effect).
It is also sometimes difficult to measure the resistance of a coil, or perhaps this information does not appear in the
technical data on the coil.
A practical way of adjusting the DBT is to vary the resistance setting, starting from the minimum value (50 Ω) until the
relay disables its resistance monitoring output. It is advisable to increase this setting to approximately 20% to reduce
the impact of temperature and ground impedance.
If the setting cannot be made in this manner, apply the maximum setting (200 Ω) to avoid unwanted operation.
Voltage
The recommended setting is al 10% less than the lowest expected voltage from the battery.
Time
The recommended time varies depending on the application.
In any case, the time set must be greater than the maximum time during which both auxiliary breaker contacts (52a
and 52b) are open simultaneously. The reason for this requirement is that during that time, the resistance measured
by the DBT protection is infinite for both inputs (52a and 52b) indicating a fault. This fault could produce a COIL alarm
if this situation is maintained over the time set in the relay.
If other auxiliary contacts are connected in series with 52a or 52b contacts (i.e. springs, etc.) their response time
should be included in the calculation of the total time of coincidence of 52a and 52b open.
6
DBT Digital Trip Coil Supervision Relay
GEK-105597C
MODEL LIST
3. MODEL LIST
The data required to fully define a model are those shown in the chart below.
The possible models are:
DBT
*
0
0
*
A
0
*
0
H
0
*
DESCRIPTION
Number of coils
1
1 coil (single-phase)
3
3 coils (three-phase)
Coil resistance
0
75-300 Ohm
1
150-600 Ohm
Breaker Voltage
1
110/125 V DC
2
220/250 V DC
Output relays option for DBT1
models
0
See Figure 2 at the end of the
manual
Output relays option for DBT3
models
GEK-105597C
0
See Figure 3 at the end of the
manual
1
See Figure 3 at the end of the
manual
2
See Figure 4 at the end of the
manual
DBT Digital Trip Coil Supervision Relay
7
MODEL LIST
8
DBT Digital Trip Coil Supervision Relay
GEK-105597C
OPERATING PRINCIPLES
4. OPERATING PRINCIPLES
Figure 7 (Block diagram) shows the basic operation of the DBT (the most common case of a 3-phase version).
Seven units of measurement can be seen:
1. Voltage measurement for undervoltage function of breaker power supply.
2. Resistance measurement of coil 1 through contact 52/b.
3. Same through contact 52/a.
4. Resistance measurement of coil 2 through contact 52/b.
5. Same through contact 52/a.
6. Resistance measurement of coil 3 through contact 52/b.
7. Same through contact 52/a.
The first measurement unit serves an undervoltage comparator which will give a signal if the voltage is lower than the
setting, activating an adjustable timer between 0.2 and 20 seconds. If the undervoltage continues for at least the set
time, the timer output will activate the signal breaker voltage failure and also the signal general failure. The activation
of failure signals deactivate the corresponding output relays.
Note: ‘deactivation of a relay’ is understood to mean that it changes to its standby position as shown in the external
connections diagram, i.e. a NO closes and a NC opens.
The timer has a preset voltage drop time of 100 ms, thereby ensuring a minimum time in which the output contacts
are maintained for at least 100 ms.
Two resistance measurement devices are located after the undervoltage unit, both monitoring the first coil. The
resistance measurement is calculated through the voltage drop produced by the current injected by the current
sources.
Supposing that the breaker is closed, auxiliary contact 52/a would also be closed, whereas 52/b would be open. The
measuring unit connected to 52/b would show a higher voltage than that of the resistance setting, i.e. the DBT will
measure a higher resistance than the setting. On the other hand, the unit connected to 52/a will give a lower
resistance reading than the setting, taking into account that the coil circuit is correct.
Both resistance measuring unit outputs are the inputs of an equality comparator (this is a comparator that produces
output when both inputs are high or low, i.e. equal). In the example mentioned, one measuring unit gives a HIGHER
resistance than the setting whereas the other gives a LOWER resistance. Therefore, the comparator detects inputs
are not equal and does not produce an output signal, which means coil circuit is in a good condition. In case the coil
is broken, resistance measured by both units is infinite (i.e. equal) and the equality comparator produces a failure
signal. That signal is feed into a timer. After the set time elapses with a failure signal, two signals are generated, coil
failure and general failure.
As described for coil 1, the 3-phase DBT has circuits for a second and third coils.
In the case of a single-phase DBT, there are only resistance measuring unit for coil 1 (in addition to the undervoltage
unit).
GEK-105597C
DBT Digital Trip Coil Supervision Relay
9
OPERATING PRINCIPLES
Internal setting
In the 3 coils DBT model, there is an internal setting which can be made by moving a jumper in the printed circuit,
that allows to configure all the outputs as general ones (BREAKER CIRCUIT OK). Any failure (undervoltage or
resistance) will mean that all outputs will be deactivated.
In addition to the outputs mentioned, and as described in detail in Figures 2 & 3: External Connections, the DBT has
a SYSTEM READY output relay. This closes the contact in case the relay is not available due to one of the following
causes:
•
An internal fault.
• An auxiliary voltage drop of the supply.
• The relay has been disabled.
The DBT can be disabled either externally by enabling one or several of any of the 4 digital inputs for inhibition (in the
case of the 3-phase) or by the single input for the single-phase, or locally by the switch labelled ENABLE. A disabled
DBT will continue to measure and give information through the LEDs but all its relays will be inoperative except the
SYSTEM READY relay, which will close its contact.
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DBT Digital Trip Coil Supervision Relay
GEK-105597C
TECHNICAL CHARACTERISTICS
5. TECHNICAL CHARACTERISTICS
5.1 TECHNICAL CHARACTERISTICS
• AUXILIARY SUPPLY
A ripple factor is allowed provided that the instantaneous voltage does not exceed the indicated upper and lower
limits. For example, on the 110-125 V model the voltage at any given time should never drop below 88 V nor go
above 150 V.
• 110-125 V DC ± 20%
• 220-250 V DC ± 20%
• TEMPERATURE RANGES
Operational range:
-25ºC to + 55ºC
Storage range:
-40ºC to + 70ºC
Complies with IEC 255-6 and ANSI C37.90 Standards.
• HUMIDITY
Up to 95% without condensation.
• OUTPUT CONTACTS
Breaking capacity:
4000 VA
Maximum DC voltage: 300 V DC
Maximum AC voltage: 440 V AC
Continuously:
16 A
Making capacity:
30 A
• ACCURACY
Voltage:
Resistance:
Time:
± 5%
± 10%
20 ms
• VOLTAGE CIRCUIT BURDEN
110-125 V DC model: 48 kΩ
220-250 V DC model: 96 kΩ
DIGITAL INPUT BURDEN
110-125 V DC model: 66 kΩ
220-250 V DC model: 132 kΩ
• AUXILIARY POWER CONSUMPTION
Standby:
Operated:
GEK-105597C
3 W (only NC alarm relay activated)
7.5 W (all relays activated)
DBT Digital Trip Coil Supervision Relay
11
TECHNICAL CHARACTERISTICS
• WEIGHTS
Net:
Packed:
3 kg
4 kg
• WATERTIGHTNESS
Index:
IP51
• DIMENSIONS
Width:
483 mm (19” rack)
Depth:
200 mm
Height: 45 mm (1 height unit)
• INSULATION
As per IEC 255-5.
Between terminal and case:
2000 V AC for 1 minute at industrial frequency.
Between independent circuits:
2000 V AC for 1 minute at industrial frequency.
5.3 TYPE TESTS
1 MHz interference test
2.5 kV common mode, 1 kV differential, class III as per IEC 255-4.
Impulse test
5 kV peak 1.2/50 µs, 0.5 J as per IEC 255-4.
Radiointerference
As per IEC 1000-1-2. IEC 255-22-2 class IV.
Electrostatic discharge
As per IEC 1000-1-3. IEC 255-22-3 class III.
Fast transient
As per IEC 1000-1-4. IEC 255-22-4 class IV.
Emissivity
As per EN 55022, class B.
Magnetic fields
As per IEC 100-4-8, class V
Vibration
12
DBT Digital Trip Coil Supervision Relay
GEK-105597C
TECHNICAL CHARACTERISTICS
As per IEC 255-21-1, class II.
Shock test
As per IEC 255-21-2, class II.
The DBT relay complies with these Standards, which includes the GE Standard on the level of insulation and
electromagnetic compatibility required by CE Directive 89/336 for CE marking, according to standardised European
regulations. It also complies with the European Low Voltage Directive and the environmental and operational
requirements laid down in Standards ANSI C37-90, IEC 255-5, IEC 255-6 and IEC 68.
GEK-105597C
DBT Digital Trip Coil Supervision Relay
13
TECHNICAL CHARACTERISTICS
14
DBT Digital Trip Coil Supervision Relay
GEK-105597C
RELAY SETTINGS
6. RELAY SETTINGS
The settings are located on the relay’s nameplate in the form of dip switches. Their meanings are printed, indicating
ranges in addition to the functions.
In the DBT3000 there is an internal setting. This setting
enables individual or general selection of the output
relays. If General mode is chosen (position G), any fault
(in the coil or the control voltage) will trigger all the
relays. If the jumper is put in the Independent mode
(position I) each relay will operate only on its own
function when the corresponding fault occurs.
LEDs are also located on the relay and serve as indicators to give information on the relay and the circuits being
monitored.
The next section describes the LEDs and their settings, seen from left to right. If a relay is not available, use Figure 1:
Characteristics nameplate for reference.
6.1 ‘READY’ LED
A two-colour LED which can be in any one of the following three situations:
- Off: indicates absence of auxiliary supply voltage.
- Green: the relay is fully operational.
- Red: The relay is disabled, either because one of the disabling inputs has been enabled or because it has
been disabled with the ENABLE switch.
When the DBT is disabled all its outputs are disabled and the SYSTEM READY relay is closed. However, all
the measuring, decision and timer units stay operational, as do the LED indicators.
GEK-105597C
DBT Digital Trip Coil Supervision Relay
15
RELAY SETTINGS
6.2 ‘ENABLE’ SWITCH
This switch has two positions:
- Left: relay disabled, READY LED will go red.
- Right: enabled relay, the READY LED goes green, provided none of the external disabling inputs are
active.
At the back of the relay there are digital disabling inputs on terminals C1-D1, C2-D2, C3-D3 and C4-D4 (3phase model) and C1-D1 for the single-phase model (see Figure 6: Rear terminal plate). The enabling of any of
these inputs has the same effect as the ENABLE switch in the left position.
The enabling of the inputs is DC operated (same margin as supply voltage). As there is galvanic insulation
between them they can be enabled by voltage from different batteries or can be grouped in a single one. These
inputs are polarised, the positive on the C terminals and the negative on the D terminals. An inversion of polarity has
no negative effects on the relay, although the input would not be enabled.
6.3 ‘RESET TARGET’ SWITCH
This switch has two uses:
- Acknowledgement of indicators. A fault is recorded by an LED with memory. This is erased by pressing
and releasing the RESET button. If the auxiliary voltage drops the registered LED operation will be erased
too.
- Checking indicators: This feautre is used to ensure indicators are working properly. When the RESET
button is pressed all the indicators which are out will lit up.
6.4 LED INDICATORS
There are four LEDs, the first indicates a breaker power supply fault and the others coil faults. They are red
LEDs, and can be in one of the three following states:
- Off.
This means there is no fault. In the case of the breaker power supply it would be above the
preset voltage. For coils, that their resistances are not above the preset value.
- Flashing red: fault situation. If this situation continues for the preset time period, the output relay will be
enabled and the LED will continue to flash.
- Red:
a fault has occurred but disappeared, although not yet acknowledged by the user. This
acknowledgement is done by pressing RESET.
If a red light is present and another fault occurs the LED does not flash, but when RESET is pressed the LED starts
to flash.
16
DBT Digital Trip Coil Supervision Relay
GEK-105597C
RELAY SETTINGS
6.5 COIL RESISTANCE SETTING
This is the coil failure circuit threshold. It is a block of 4 dip switches.
The minimum value is 75 Ω, the maximum 300 Ω and the step 15 Ω.
For example, if a setting of 150 Ω is required, put dip switches 1 and 3 in the UP position. You then have: 75
+ 15 + 60 = 150.
The DBT will consider that there is a fault condition if BOTH resistances measured in 52a and 52b inputs are
OVER the setting. It also will consider a fault when both resistances are BELOW the setting, because this is not a
normal condition.
The fault has to be maintained during the set time to allow the output relay operate. This time prevents
misoperation during breaker status transition.
6.6 VOLTAGE SETTING
This is the threshold for the breaker power supply failure unit. As in the case of the resistance setting, it is a
block of 4 dip switches.
For the 110/125 V DC model the minimum value is 50 V, the maximum 125 V and the step 5 V.
For the 220/250 V DC model the values are double the above, so the minimum is 100 V, the maximum 250 V
and the step 10 V.
If a setting of 115 V is required (110/125 model), raise dip switches 1, 3 and 4, making a total of: 50 + 5 + 20
+ 40 = 115. This is equivalent to 230 V on the 220/250 V model.
6.7 TIME DELAY SETTING ADJUSTMENT
This is the timer adjustment, made through a block of 3 dip switches.
The minimum value is 0.2 seconds, the maximum 20 and the step 0.1.
Note: although it is theoretically possible to select a time which is higher than the maximum (for example, if
all the dip switches are put in the UP position you apparently have a setting of 27.5 seconds, the maximum),
in reality, if all the dip switches are in the UP position the setting is 20 seconds. Therefore, any adjustment
above 20 seconds will be considered as if it were 20 seconds. This has been done because there is no point
in having a higher setting.
GEK-105597C
DBT Digital Trip Coil Supervision Relay
17
RELAY SETTINGS
6.8 SUMMARY TABLE OF SETTINGS
18
Name of setting
Enable
Max.
Enabled
Min.
Disabled
Step
____
____
Set to
Enabled
Disabled
Resistance
Voltage
110/250 model
220/250 model
300 Ω
75 Ω
15 Ω
_____ Ω
125 V
250 V
50 V
100V
5V
10 V
_______ V
_______ V
Time delay
20 s
0.2 s
0.1 s
_______ s
DBT Digital Trip Coil Supervision Relay
GEK-105597C
RECEPTION TESTS
7. RECEPTION TESTS
7.1 VISUAL INSPECTION
Check that the information on the nameplate coincides with the details of the order. A check should also be made to
ensure that the relay is not scratched or has received impacts, and that there are no loose parts as a result of bad
handling in transit.
7.2 INSULATION
As a result of the presence of filter capacitors (used to protect the relay from external interference) a reading of
approximately 3 mA (at 2000 V AC/50Hz) will be had on each capacitor. This may create problems for the insulation
test equipment if it is unable to supply all the current. To avoid this problem, remove the connection from terminal
B11 to B 12, thus separating the capacitor ground circuit (B 11) from the relay housing (B 12).
Important: for safety reasons, the relay housing should always be earthed by an earthing cable connected to
terminal B 12.
Do not forget to make the shortest possible connection to terminals B 11 and B12, so that the capacitors can perform
their filtering operation correctly.
Important: to avoid serious damage to the relay, make sure that all the terminals from the same group are connected
to each other while test voltage is being applied to that group.
The groups are as follows:
Breaker circuits:
G1:
G1:
B1, 2, 3, 4, 5, 6, 7 & 8
B1, 2, 3, & 4
3-phase model
single-phase model
Auxiliary supply:
G2:
B9, B10
Digital inputs:
G3:
G3:
C1, D1, C2, D2, C3, D3, C4, D4 3-phase model
C1, D1
single-phase model
Relay contacts:
G4:
G4:
C6, D6, C7, D7, C8, D8, C9, D9 3-phase model
C10, D10, C11, D11, C12, D12
C9, D9, C10, D10, C11, D11
single-phase model
C12, D12
These tests will only be done on new relays. A ‘new relay’ is defined to be one which has not entered in service, has
been delivered in the previous year and has been suitably stored to avoid deterioration.
Note: apply the insulation voltage (2000 V AC) gradually, and reduce it gradually to zero to avoid stored charges.
GEK-105597C
DBT Digital Trip Coil Supervision Relay
19
RECEPTION TESTS
7.3 TRIP LEVEL TEST
Connect the relay as indicated in the external connections diagram (Figs. 2 & 3), using a DC power supply (110/125
or 220/250 V) for the auxiliary voltage (terminals B9-B10), according to the model. Variations of ±20% are admitted (20% of the minimum and +20% of the maximum). For breaker power supply (terminals B1-B2) a second variable
DC power supply is needed.
Apply different voltages and check that the undervoltage LED flashes (pick-up) with the pick-up voltage (see table
below). The LED remains flashing, until the undervoltage condition disappears (drop-out voltage). When the drop-out
voltage is reached, and the set time ellapses, the LED stop flashing and is lit permanently (fault memory function). It
is recommended to set the time to the minimum in order to ease the test.
110/125 model
VOLTAGE
setting (V)
50
55
60
70
90
125
20
Pick-up
voltage (V)
(voltage
failure)
45
50
55
65
85
118
220/250 model
Drop-out
voltage (V)
(voltage ok)
VOLTAGE
setting (V)
55
60
65
75
95
133
100
110
120
140
180
250
DBT Digital Trip Coil Supervision Relay
Pick-up
voltage (V)
(voltage
failure)
90
100
110
130
170
236
Drop-out
voltage (V)
(voltage ok)
110
120
130
150
190
264
GEK-105597C
RECEPTION TESTS
7.4 TIME DELAY TEST
The check the tripping time the loss of continuity of the coil connected to terminals B2 and B3 will be simulated.
CLOCK
start
stop
DBT
P
U
S
H
B
U
T
T
O
N
C11
D11
Breaker
circuit
failure
Insert a dual-circuit switch. One of the circuits
which is normally closed will short-circuit
terminals B2 and B3, simulating that the coil is
correct. The other contact (normally opened)
will be connected to the start-up of a timer. The
timer stop will be connected to one of the
breaker circuit failure relays. When the pushbutton is pressed the B2-B3 will be opened,
leading to a start of failure.
Create a fault as described (above) and check
that the results in the table are complied with.
B3
B2
TIMER DELAY
setting
200 ms
300 ms
400 ms
600 ms
1s
1.8 s
3.4 s
6.6 s
13 s
Maximum *
Minimum time
Maximum time
200 ms
300 ms
400 ms
600 ms
1s
1.8 s
3.4 s
6.6 s
13 s
19.9 s
240 ms
340 ms
440 ms
640 ms
1.04 s
1.84 s
3.44 s
6.64 s
13.04 s
20.1 s
* The maximum setting will be made by placing all the dip switches in the UP position
The setting is limited to 20 s (as explained previously).
Measure the drop-out time of the output relay.
This time will be between 100 and 150 ms (nominal value 125 ms).
During this test it can be seen that the measured times may vary slightly owing to the response time of the measuring
units and the output relays.
GEK-105597C
DBT Digital Trip Coil Supervision Relay
21
RECEPTION TESTS
7.5 RESISTANCE MEASUREMENT TEST
To carry out this test, which is done on the measuring unit of coil 1, disconnect terminal B4 and leave it unconnected
(simulating an open circuit). Place a resistor (simulating the breaker coil) between terminals B2 and B3. This
resistance should give the readings indicated in the table below.
Resistance
setting (Ω)
75
90
105
135
195
300
Minimum R
(Ω)
67
82
95
122
175
270
Maximum R
(Ω)
82
99
115
149
215
330
Check that the relays do not
trigger at the minimum values
and that they do at maximum
values.
The test is done in the sequence
described for each of the
settings indicated
Repeat this test for the units
Corresponding to coils 2 and 3.
7.6 ENABLE TEST
Disable the relay by putting the ENABLE switch in the left-hand position. Check that there is no disabling through the
digital inputs (disconnect or deenergize these inputs).
The alarm contact will close and the enabled relays will drop-out. The ‘READY’ LED will go from green to red.
Enable the relay by putting the ENABLE switch in the right-hand position.
Repeat this test by applying nominal voltage to each of the 4 digital inputs (3-phase model) and the single input for
the single-phase model. The same will happen as in disabling by the ENABLE switch.
22
DBT Digital Trip Coil Supervision Relay
GEK-105597C
FIGURES
FIGURE 1: NAMEPLATE (226B1298H3)
GEK-105597C
DBT Digital Trip Coil Supervision Relay
23
FIGURES
(PUEDEN SER POSITIVOS SEPARADOS)
CAN BE CONNECTED TO ISOLATED CIRCUITS
(+)
B9
TENSION MANDO
BREAKER VOLTAGE
TRIP
C1
B1
O C
O C
C O
O= OPEN / ABIERTO
C= CLOSED / CERRADO
C12
B4
52b
a
SIN Vaux
NO Vaux
Vaux y Fallo
Vaux & Fail
Vaux y NO Fallo
Vaux & No Fail
B3
52a
52
LOGICA CONTACTOS:
CONTACT LOGIC
ALARMA EQUIPO
D12 SYSTEM READY
FUENTE
DE
ALIMENTACION
POWER SUPPLY
52
b
C11
INHIBICION
INHIBITION
CIRCUITO INTERRUPTOR CORRECTO
D11 BREAKER CIRCUIT O.K.
C10
CIRCUITO INTERRUPTOR CORRECTO
D10 BREAKER CIRCUIT O.K.
52
TC
C9
D9 CIRCUITO INTERRUPTOR CORRECTO
TENSION MANDO
BREAKER VOLTAGE
ANTIPARASITOS / SURGE
CHASIS / CASE
BREAKER CIRCUIT
OK
B2
B11
(*)
B12
B10
(-)
(*) Desconectar solo en prueba de aislamiento
D1
TIERRA DE PROTECCION
PROTECTIVE EARTH
(PUEDEN SER NEGATIVOS SEPARADOS)
CAN BE CONNECTED TO ISOLATED CIRCUITS
Only disconnect in Hipot testing
FIGURE 2. EXTERNAL CONNECTIONS – ONE COIL (226B6291H5)
24
DBT Digital Trip Coil Supervision Relay
GEK-105597C
FIGURES
FIGURE 3: EXTERNAL CONNECTIONS – THREE COILS (226B6291H4)
GEK-105597C
DBT Digital Trip Coil Supervision Relay
25
FIGURES
FIGURE 4: EXTERNAL CONNECTIONS – MODEL DBT3000A*0H02 (226B6291H6)
26
DBT Digital Trip Coil Supervision Relay
GEK-105597C
FIGURES
FIGURE 5: MECHANICAL DIMENSIONS AND CUT-OUT (226B6086H11)
GEK-105597C
DBT Digital Trip Coil Supervision Relay
27
FIGURES
FIGURE 6. REAR TERMINAL PLATE (226B6292H1)
28
DBT Digital Trip Coil Supervision Relay
GEK-105597C
FIGURES
FIGURE 7: BLOCK DIAGRAM
GEK-105597C
DBT Digital Trip Coil Supervision Relay
29