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DTSZ2-EP, DTSZ2-HA-EP
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| DIGITAL TRANSFORMER VOLTAGE
AND COOLING REGULATOR |
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| The digital transformer voltage and cooling
regulator of type DTSZ2-EP, DTSZ2-HA-EP is part of device family named EuroProt.This
short description contains special data of this type. General and common
features of EuroProt family can be found in the EuroProt system information
sheet. Accordingly it is proposed to study both this short description and
system information sheet too, in order to understand the device entirely. |
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| Application field |
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The DTSZ2-EP digital transformer voltage regulator
is designed to perform all regulation tasks of high/medium voltage transformers.
It is suitable to regulate the secondary voltage of two or three winding
transformers, compounding the simulated line drop voltage, to perform voltage
supervision (limitation), and to initiate interaction with compensating
capacitor banks as well.
Concerning the voltage to be regulated, the automatic voltage regulator
has tw'o dead-band settings, which makes possible the regulation with short
time delay in case of large voltage deviation. An additional short regulation
time delay can be set as well, for the case, if after performing the regulation
command the voltage does not return immediately inside the pre-set limits.
Within the "remembering time" the subsequent regulating command
is issued after this short time delay.
The digital automatic voltage regulator performs not only the functions
of traditional solid state voltage regulators (ATSZ) and voltage monitoring
(FHA) devices, but for the users it offers all the advantages of the digital
technique as well.
The DTSZ2-HA/EP version of the regulator includes the full temperature regulator
function (controlling the cooling fans) for the transformers as well. |
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| Main features |
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- the DTSZ.EP voltage regulator can serve two or three winding transformers
- the automatic voltage regulator function (ATSZ) maintains the voltage
of the regulated medium voltage side within the prescribed limits, calculated
with load current compensation
- the function for voltage supervision and limitation (FHA) monitors
the voltages of all sides of the transformer, and if it is necessary,
it interacts to the process of voltage regulation and to the operation
of the capacitor bank(s)
- the automatic voltage regulation can be switched over to manual operation
- the voltage setting can be decreased and set back on the front panel
and by remote signals too
- the voltage regulator device can serve for dual bus-bar secondary
schemes as well
- the automatic cooling regulator function of DTSZ2-HA/EP version maintains
the temperature of the transformer within finite limits, it controls
cooling fans, and in case of failure, the alarm state is signalled.
The temperature controller function does not interact with voltage regulation
(ATSZ) and voltage limitation (FHA)
- the temperature controller function (HA) in case of the energised
state of the transformer, with operation of the temperature relay, starts
all the fans. In case of fan failure it gives alarm signal after the
set time delay
- the temperature controller function (HA) monitors the voltage as well,
and if the voltage drops below 50 % the function is inhibited
- as an option a DlGIPROT disturbance recorder module can be included,
which records both (or all the three) side voltages of the transformer
and all the currents concerned as analogous signals, and all the digital
signals in connection with the operation of the automatic voltage and
temperature regulation. It can record the sampled time sequences during
50, 100 or 150 seconds
Software characteristics:
- built-in self-monitoring function
- event recorder with 1 ms time resolution for max. 300 events
- intelligent digital function-matrix
Hardware characteristics:
- fully numeric signal processing with built-in A/D converter and main
processor
- 16 or 18 (HA version) opto-coupler binary input
- 8 output relays
- type of contacts (NO or NC) can individually be selected at order
Communication:
- 2x16 character LCD display for relay setting and for message display
- on-line screen on external PC for easy commissioning and checking
purposes
- external communication connection with RS 232 or fibre optic selected
by setting
- optional module for connection to SCADA system
- parameters can be saved and loaded to the device again
- real-time clock with battery supplied RAM, which can be synchronised
by external computer via fibre optic connector, via built-in IRT interface
for the SCADA system, or via opto-coupler-fed binary input
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| Working principle |
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The DTSZ2-EP transformer voltage regulator
performs automatic voltage regulation and voltage limitation (voltage monitoring)
functions for the high voltage/medium voltage transformers for the main
distribution network.
The main task of the automatic voltage regulation function (ATSZ) is to
regulate the secondary voltage of the high/medium voltage regulating transformers
in order to keep the voltage of the consumers, connected on different locations
to the network, within the allowed limits, independent of the load current.
To achieve this the voltage of the medium voltage bus-bar is regulated.
The necessary bus-bar voltage-load characteristics are determined based
on voltage profile investigation for the given network, the characteristics
of the voltage regulator are set based on these results.
The automatic voltage regulator has two setting ranges concerning the voltage
to be regulated, and four different regulation time delays can be set to
this (to both upper limits and to the lower limits separately). In case
of violation of the narrower setting ranges the automatic voltage regulator
performs the regulation with longer time delay, according to the setting.
If the regulated voltage moves outside the broader range, the automatic
voltage regulator performs the regulation with appropriate shorter time
delay.
An additional shorter regulating time can be set for the device. If the
voltage does not return within the allowed limits after performing the regulation
command, within the "remembering time" the subsequent regulating
command is issued after this short time delay. The characteristics of the
voltage regulator is shown on the following figure.
The voltage limitation function (FHA) (voltage monitoring) means, hat the
automatic voltage regulator monitors the voltages on all sides of the transformer,
in order to prevent extreme high or extreme low voltage in case of regulator
failure or in case of abnormal voltage states of the network, and in case
of high voltage side voltage reactive power states to influence the operation
of the regulator.
If necessary the switching on or off the capacitor banks connected to the
bus-bar is controlled by the regulator as well. In case of three winding
transformers the voltage of the not regulated side is monitored, and if
necessary, the operation of the voltage regulator must be influenced.
The automatic temperature regulator function (HA) is in operation, if:
- the power supply is switched on
- the regulated Uline voltage can be measured (its value
is higher than 50 %)
- the temperature regulation is enabled
If the conditions mentioned above are fulfilled, the automatic voltage
regulator receives the starting command of the transformer temperature
protection. The starting command means that the temperature of the operating
transformer reached the pre-set value, so the intervention of the cooling
automatics is necessary .The effect of the starting is that the temperature
regulator submits energising command to all cooling fans. Depending on
the number of existing cooling fans or fan groups, the appropriate number
of closing contacts is used.
If the energising contacts are closed, and during this time a fan fails
or stops, a signal is received via the "contact error" digital
input. After the pre-set time delay the error signal "Cooling disturbance"
is issued.
The cooling automatic function can be enabled or disabled with auxiliary
signals via the digital inputs. The enabling/disabling is controlled by
signal impulse.
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| Technical data |
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Rated secondary current, In
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1 A or 5 A |
| Rated secondary voltage (line), Un |
100 V or 200 V |
| Rated frequency |
50 Hz or 60 Hz |
Overload capacity, voltage circuit, thennal, continuous
current circuit, thennal, continuous
1 s |
2xUn/Ö3
4xIn
100xIn (In=1 A), 50xIn (In=5 A) |
| Dynamic current limit |
100xIn |
| Accuracy of timers |
± 3 ms (steps 10 ms)
± 12 ms (steps 1 s) |
| Output contacts |
8 pcs |
| Type o output contacts (NC, NO) |
2 NC, 6 NO (or as requested) |
Output contacts, electrical
data:
rated switching voltage
continuous load current
making current
DC breaking capability at 220 V,
at pure conductive load
at load of L/R=40 ms
Optionally, at load of L/R = 40 ms |
250 V
8 A
16 A
0,25 A
0,14 A
4 A |
Auxiliary DC voltage (the same supply unit)
voltage tolerance
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220 V or 110 V
88 V to 310 V |
| Permissible ambient temperature |
0o to 50o C |
| Insulation test (IEC 255) |
2 kV, 50 Hz
5 kV, 1.2/50 µs |
| Disturbance test (IEC 255) |
2.5 kV, 1 MHz |
| Electrostatic discharge (ESD; IEC 801-2) |
8 kV |
| Burst test, (IEC 801-4) |
2 kV |
| Setting ranges |
| FHA Voltage max. value |
100-130%, step 1% |
| FHA Voltage min. value |
70-100%, step 1% |
| ATSZ Voltage ref. max. |
70-130%, step 1% |
| ATSZ Voltage ref. min. |
70-130%, step 1% |
| ATSZ Ud1 band value |
1-30%, step 1% |
| ATSZ Ud2 band value |
1-30%, step 1% |
| ATSZ ref. value remote setting, Uremote |
0-30%, step 1% |
| ATSZ upper knee point, max. current setting |
10-150%, step 1% |
| ATSZ lower knee point, min. current setting |
10-150%, step 1% |
| ATSZ rated primary current of CTs for capacitor banks,
expressed as percentage of transformer CT rated primary current |
1-100%, step 1% |
| Time delay setting range |
0-600 s, step 1 s |
| External communication mode |
RS 232 or fibre optical cable |
| Series communication speed (BaudRate) |
150 do 19200, step:2x |
| Optical fibre cable operation mode |
radial or loop |
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| Design, size |
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| An EuroProt is always rack mounted, it has two
design forms. One of the form is suitable to be mounted into standard 19"
cabinet frame, this form is also suitable to be mounted directly to a relay
panel with flash mounted form. The other form is a relay panel mounted device
with raised-hinged form. Its size depends on the chosen form. |
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Design
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Width
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Height
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Depth
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Rack mounting
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483 mm
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132,5 mm
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201 mm
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Panel mounting
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490 mm
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250 mm
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250 mm
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Weight 8 kg. |
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| Options |
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- digital disturbance recorder (see separate information sheet)
- SCADA connection (see EuroProt system information sheet)
- relay contacts with 4 A breaking capability
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| Ordering data |
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- Device type [DTSZ2( -HA)-EP]
- Rated current [1 A, 5 A]
- Rated voltage [ 100 V, 200 V]
- Type of output contacts [NO, NC]
- Protection case type
- Supervisor circuit for output circuits
- Options if needed
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