Download XP2-R Reverse Power Relay Manual PDF

TitleXP2-R Reverse Power Relay Manual
TagsTypes Brochures
File Size301.3 KB
Total Pages14
Document Text Contents
Page 1

XP2-R - Power and reverse power relay

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2 TD_XP2-R_01.06_GB


1. Applications and features

2. Design

3. Function
3.1 Measuring principle
3.2 Calculation of the setting value
and reverse power

4. Operation and settings
4.1 Setting of DIP-switches
4.2 Setting of the tripping values
4.3 Communication via serial interface
adapter XRS1

5. Relay case and technical data
5.1 Relay case
5.2 Technical data

6. Order form

1. Applications and features

Relay XP2-R of the PROFESSIONAL LINE is a digital relay
for reverse power detection of gen.-sets in parallel and
active power supervision of power systems.

For generators operating in parallel with a mains or
another generator, it is imperative to supervise the
power direction. If for example the prime mover fails
the alternator operates as a motor and drives the prime
mover (diesel or turbine). The XP2-R detects the reverse
of the power direction and - in case of this error -
switches off the alternator. This way, power losses and
damages of the prime mover are avoided.

When compared to conventional protection equipment
all relays of the PROFESSIONAL LINE reflect the superiority
of digital protection technique with the following fea-

• High measuring accuracy by digital processing
• Fault indication via LEDs
• Extremely wide operating ranges of the supply volt-

age by universal wide range power supply unit
• Very fine graded wide setting ranges
• Data exchange with process management system by

serial interface adapter XRS1 which can be retrofit-

• True power measurement by multiplication of current
and voltage

• Extremely short response time
• Adjustment of rated data
• Compact design by SMD-technology

In addition to this relay XP2-R has the following special
• Measurement phase-to-neutral or phase-to-phase

voltage possible
• Tripping times for supervision P and PR adjustable

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TD_XP2-R_01.06_GB 7

4.1 Setting of DIP-switches

The DIP-switch block on the front plate of unit XP2-R is
used for adjustment of the nominal values and setting
of function parameters:

DIP-switch OFF ON Function
1* Un = 100 V Un = 110 V Setting of rated voltage
2* Un = 100 V Un = 230 V
3* Un = 100 V Un = 400 V
5 Y ∆ Measuring phase-to-neutral/phase-to-

phase voltage
6 500 ms 40 ms Returning time
7 x 1 x 10 Multiplier for tPR>
8 x 1 x 10 Multiplier for tP>

Table 4.1: Function of DIP-switches

*Only one of the DIP-switches 1 - 3 shall be in „ON“ position at the same time.

Rated voltage

The required rated voltage can be set with the aid of
DIP-switch 1 - 3 to 100, 110, 230 or 400 V AC. The
rated voltage is defined as the real connected voltage
applied to connection terminals
1L - 2L. It has to be ensured that only one of the three
DIP-switches is switched on. The following DIP-switch
configurations for adjustment of the rated voltage are

Abb. 4.3: Adjustment of rated voltage

Rated voltage chosen too low does not cause destruc-
tion of the unit but leads to wrong measuring results
which may lead to false trippings.

Measuring of phase-to-neutral/phase-to-phase volt-

The phase-to-neutral (position „OFF“) or phase-to-phase
voltage (position „ON“) can be adjusted by means of
switching over the DIP-switch 5.

Hysteresis of P> and PR>

The hysteresis of both trip elements are fixed to
0.8 % Pn.

The chosen rated voltage is 400 V.
The rated current is 5 A.
400 V x 5 A x 0.8 % = 16 W hysteresis

Returning time

If DIP-switch 6 is in ON position, the returning time of
P> and PR> is 40 ms. At the same time the tripping va-
lues of tPR> and tP> are set to their minimum values ir-
respectively of their potentiometer setting.
This setting is only used together with a XG2 relay as
power direction controlled vector surge tripping for
synchronous motors.

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8 TD_XP2-R_01.06_GB

4.2 Setting of the tripping values

The PROFESSIONAL LINE units have the unique possibility
of high accuracy fine adjustments. For this, two poten-
tiometers are used. The course setting potentiometer
can be set in descrete steps of 5 %
( or 20 %). A second fine adjustment potentiometer is
then used for continuously variable setting of the final
0 - 5 % (or 0 - 20 %). Adding of the two values results
in the precise tripping value.

Active power supervision

The tripping value can be set in the range from
1 - 120 % Pn with the aid of the potentiometer illus-
trated on the following diagram.

A tripping value P> of 72 % Pn is to be set. The set
value of the right potentiometer is just added to the
value of the coarse setting potentiometer. (The arrow
of the coarse setting potentiometer must be inside of
the marked bar, otherwise no defined setting value).

Fig. 4.4: Adjusting example

Reverse power supervision

The tripping value at reverse power is adjustable in the
range from 1 - 30 % Pn. The adjustment is made as
shown above.

Time delay

The time delays of both power elements can be
adjusted in the range from 0 - 10 s or 0 - 100 s con-
tinuously variable (pay attention to range shifting of
DIP-switch 7 and 8)

4.3 Communication via serial interface
adapter XRS1

Abb. 4.5: Communication principle

For communication of the units with a superior man-
agement system, the interface adapter XRS1 is avail-
able for data transmission, including operating soft-
ware for our relays. This adapter can easily be retrofit-
ted at the side of the relay. Screw terminals simplify its
installation. Optical transmission of this adapter makes
galvanic isolation of the relay possible. Aided by the
software, actual measured values can be processed,
relay parameters set and protection functions pro-
grammed at the output relays. Information about unit
XRS1 in detail can be taken from the description of
this unit.

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TD_XP2-R_01.06_GB 13

Setting-list XP2-R

Project: SEG job.-no.:

Function group: = Location: + Relay code: -

Relay functions: Date:

Setting of parameters





P> Power supervision % Pn 1

PR> Reverse power supervision % Pn 1

tP> Tripping delay of power element s 0

tPR> Tripping delay of reverse power element s 0

DIP-switch Function Default settings Actual

1* 100 V
2* Adjustment of rated voltage 100 V
3* 100 V
5 Measuring phase-to-neutral/phase-to-phase voltage Y
6 Returning time 500 ms
7 Multiplier for PR> x 1
8 Multiplier for P> x 1

*Only one of the DIP-switches 1 - 3 shall be in „ON“-position at the same time.

Page 14

Woodward SEG GmbH & Co. KG
Krefelder Weg 47 ⋅ D – 47906 Kempen (Germany)
Postfach 10 07 55 (P.O.Box) ⋅ D – 47884 Kempen (Germany)
Phone: +49 (0) 21 52 145 1


Phone: +49 (0) 21 52 145 635 ⋅ Telefax: +49 (0) 21 52 145 354
e-mail: [email protected]

Phone: +49 (0) 21 52 145 614 ⋅ Telefax: +49 (0) 21 52 145 455
e-mail: [email protected]

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